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Panasonic KX-FC379CX Service Manual

Digital cordless phone system with fax and copier
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Digital Cordless Phone System with FAX and Copier
KX-FC379CX
(for Asia and Middle Near East)
© 2005 Panasonic Communications Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. KMF0504858CE
Unauthorized
copying
and

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Summary of Contents for Panasonic KX-FC379CX

  • Page 1 ORDER NO. KMF0504858CE Digital Cordless Phone System with FAX and Copier KX-FC379CX (for Asia and Middle Near East) © 2005 Panasonic Communications Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.
  • Page 2 KX-FC379CX 16.8. SENSOR BOARD (PCB7) SW402 CN401 PTOP SW401 REED REED SW KX-FC379CX : SENSOR BOARD SCHEMATIC DIAGRAM KXFC379CX...

  • Page 3: Table Of Contents

    KX-FC379CX CONTENTS Page Page 1 INTRODUCTION 8.5. SENSORS AND SWITCHES 1.1. ABOUT LEAD FREE SOLDER (PbF: Pb free) 8.6. MODEM SECTION 1.2. SAFETY PRECAUTIONS 8.7. DESCRIPTION OF BLOCK DIAGRAM IN ANALOG 1.3. INSULATION RESISTANCE TEST SECTION 1.4. FOR SERVICE TECHNICIANS 8.8.
  • Page 4 KX-FC379CX 14.7. SENSOR BOARD (PCB7) 16.4. POWER SUPPLY BOARD (PCB4) 15 FOR THE SCHEMATIC DIAGRAMS 16.5. CORDLESS BASE BOARD (PCB5) 16 SCHEMATIC DIAGRAM 16.6. HANDSET BOARD (PCB6) 16.1. DIGITAL BOARD (PCB1) 16.7. RF PART in HANDSET BOARD 16.2. ANALOG BOARD (PCB2) 16.8.

  • Page 5: Introduction

    KX-FC379CX 1 INTRODUCTION 1.1. ABOUT LEAD FREE SOLDER (PbF: Pb free) Note: In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that contains lead. We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn), Silver, (Ag), and Copper, (Cu).
  • Page 6 KX-FC379CX 1.1.2. How to Recognize that Pb Free Solder is Used P.C.Boards marked as “PbF” use Pb Free solder. (See the figure below.) (Example : Digital Board) Note: The “PbF” marked may be found on different areas of the same P.C.Board, depending on manufacture date.

  • Page 7: Safety Precautions

    KX-FC379CX 1.2. SAFETY PRECAUTIONS 1. Before servicing, unplug the AC power cord to prevent an electric shock. 2. When replacing parts, use only the manufacturer´s recommended components. 3. Check the condition of the power cord. Replace if wear or damage is evident.

  • Page 8: Ac Caution

    KX-FC379CX 1.6. AC CAUTION For safety, before closing the lower cabinet, please make sure of the following precautions. 1. The earth lead is fixed with the screw. 2. The AC lead is connected properly to power supply unit. 3. Wrap the earth lead around the core 3 times.

  • Page 9: Service Precautions

    KX-FC379CX 1.7.2. Live Electrical Sections All the electrical sections of the unit supplied with AC power by the AC power cord are live. Never disassemble the unit for service with the AC power supply plugged in. CAUTION: AC voltage is supplied to the primary side of the power supply unit. Therefore, always unplug the AC power cord before disassembling for service.

  • Page 10: Features And Specifications

    Nickel metal hydride (Ni-MH) batteries KX-TCA89BX Headset -------------------------------- We recommend that you buy a full-size replacement film for continuous use of your unit. Please use genuine Panasonic replacement film. The ink film is not reusable. Do not rewind and use the ink film again.

  • Page 11: Specifications

    KX-FC379CX 2.3. SPECIFICATIONS Any details given in these instructions are subject to change without notice. 2.3.1. Base Unit Applicable Lines: Public Switched Telephone Network Document Size: Max. 216 mm in width, Max. 600 mm in length Effective Scanning Width: 208 mm Recording Paper Size: Letter: 216 mm ×...

  • Page 12: Location

    KX-FC379CX 3 LOCATION 3.1. OVERVIEW 3.1.1. Base Unit (1) CHARGE indicator (2) Document guides (3) Paper tray (4) Metal recording paper guide (5) Recording paper entrance (6) Recording paper exit (7) Tension plate (8) Antenna (9) Front cover (10) Document entrance...

  • Page 13: Control Panel

    KX-FC379CX 3.2. CONTROL PANEL 3.2.1. Base Unit (1) [MIC] (12) [HELP] • • • • The built-in microphone. • • • • To print helpful information for quick referance . (2) [SEARCH] (13) [MENU] • • • • To use Caller ID features.
  • Page 14 KX-FC379CX 3.2.2. Handset (1) [Soft keys] (7) [OFF] • • • • Two soft keys are used to select functions displayed • • • • To hang up. directly above each key. Functions displayed above the • • • • To stop an operation or programming.

  • Page 15: Installation

    KX-FC379CX 4 INSTALLATION 4.1. INSTALLATION SPACE The space required to install the unit is shown below. The dimensions given are necessary for the unit to operate efficiently. Note: • • • • Avoid excessive heat or humidity. • • • • Use the unit within the following ranges of temperature and humidity.

  • Page 16: Connections

    ) to the telephone line cord of the fax machine. Battery life • • • • After your Panasonic battery is fully charged, you can expect the following performance: — it should last up to 5 hours while in use (in conversation).

  • Page 17: Installing The Ink Film

    KX-FC379CX the base unit, even when the handset is not in use. The 4.4. INSTALLING THE INK FILM longer you leave the handset off the base unit, the time you can actually talk on the handset will be shortened. Actual battery performance depends on a combination 1.
  • Page 18 KX-FC379CX • • • • Make sure that the ink film is wrapped around the blue 4. Insert the front ink film roll by inserting its blue gear into the left slot of the unit ( ). Insert the rear ink film roll by core ( ) at least once.

  • Page 19: Replacing The Ink Film

    4.6. INSTALLING THE PAPER TRAY To ensure that the unit operates properly, we recommend the use of Panasonic replacement film. (Refer to OPTIONAL Insert the tabs on the paper tray ( ) into the slots on the ACCESSORIES (P.9).) back of the unit ( •...

  • Page 20: Installing The Recording Paper

    KX-FC379CX To use Letter size paper 2. Fan the paper to prevent paper jams. Remove the A4 paper guide. 1. Press down the tab ( 2. Push the tab towards the direction of the arrow ( 3. Insert the paper, print-side down ( 4.

  • Page 21: Battery Installation

    KX-FC379CX Documents you can send Note: • • • • Remove chips, staples or other similar fasteners. • • • • Do not send the following types of documents. (Make a copy of the document and send the copy.) — Chemically treated paper such as carbon or carbonless duplicating paper —...

  • Page 22: Battery Replacement

    “Charge for 6h” and are displayed, the battery needs to be replaced. Please use only Panasonic batteries. See page OPTIONAL ACCESSORIES (P.9). • • • • Only use rechargeable batteries. If you install non- rechargeable batteries and start charging them, the batteries may leak electrolyte.

  • Page 23: Installing The Headset (Optional)

    The logo can be your name or the name of your company. Connecting an optional headset to the handset allows hands- free phone conversations. Please use only a Panasonic headset. See OPTIONAL ACCESSORIES (P.9). To connect an optional headset to the handset 1.
  • Page 24 KX-FC379CX To select characters with the dial keypad To select characters using [ + ] or [—] Instead of pressing the dial keys, you can select characters using [ + ] or [—]. 1. Press [—] repeatedly to display the desired character.

  • Page 25: Maintenance

    KX-FC379CX 5 MAINTENANCE 5.1. MAINTENANCE ITEMS AND COMPONENT LOCATIONS 5.1.1. Outline MAINTENANCE AND REPAIRS ARE PERFORMED USING THE FOLLOWING STEPS. 1. Periodic maintenance 5. Equipment repairs Inspect the equipment periodically and if necessary, clean Repair or replace the defective parts and take appropriate any contaminated parts.
  • Page 26 KX-FC379CX 5.1.2.1. Maintenance List OPERATION CHECK REMARKS Document Path Remove any foreign matter such as paper. — Rollers If the roller is dirty, clean it with a damp cloth then dry Refer to Document Feeder / Scanner glass thoroughly. Cleaning (P.32).

  • Page 27: Gear Section

    KX-FC379CX 5.2. GEAR SECTION 5.2.1. Gear Operation Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the controlling positions of Swing Gears determine which gears convey their drive power in each mode. See "Sensor Location" in SENSORS AND SWITCHES...
  • Page 28 KX-FC379CX 5.2.1.1. Transmit Mode The TX Motor rotate CCW (counterclockwise) and conveys its power to the Document Separation Roller Gear and Document Exit Roller Gear. Fig. A: Transmit mode 5.2.1.2. Paper Pickup and Paper Exit Mode The RX Motor rotate CCW and swing Gear engages Pickup_1 Gear, and conveys its power to the Pickup Roller Gear. The Swing Gear engages Exit Idler Gears, and conveys its power to the Exit Roller Gear.
  • Page 29 KX-FC379CX 5.2.1.3. Print Mode The RX Motor rotate CW and Swing Gear engages Platen_2 Gear, and conveyers its power to Platen Roller Gear and Ink Film Driver Gear. The Swing Gear engages Exit Idler Gears, and conveys its power to the Exit Roller Gear.

  • Page 30: Jams

    KX-FC379CX 5.3. JAMS 3. Open the back cover. 5.3.1. Recording Paper Jams 5.3.1.1. When the recording paper has jammed in the unit The display will show the following. 1. Open the front cover by pulling up the center part. 4. Remove the jammed recording paper ( 2.
  • Page 31 KX-FC379CX • • • • Make sure that the ink film is wrapped around the blue 5. Turn the gear of the blue core ( ) in the direction of the arrow until the ink film is tight ( core ( ) at least once.
  • Page 32 KX-FC379CX 5.3.2. Document Jams - sending 8. Remove the recording paper and straighten. Pull the 1. Open the front cover by pulling up the center part. Remove tension plate forward ( ) and insert the paper. Then push the jammed document carefully ( the tension plate back.

  • Page 33: Cleaning

    KX-FC379CX 5.4. CLEANING 4. Close the front cover securely. 5.4.1. Document Feeder / Scanner glass Cleaning Clean the document feeder/scanner glass when: — Documents frequently misfeed. — Smudges or black/white lines appear on the original document when sending or copying.
  • Page 34 KX-FC379CX 3. Release the back cover by pushing the green button ( 6. Clean the thermal head ( ) with a cloth moistened with • • • • You can also release the back cover by pushing in the isopropyl rubbing alcohol, and let it dry thoroughly.

  • Page 35: Disassembly Instructions

    KX-FC379CX 6 DISASSEMBLY INSTRUCTIONS Before disassembling, remove the ink film. 6.1. DISASSEMBLY FLOWCHART 6.1.1. Upper Cabinet Section CROSS REFERENCE: A-1: How to Remove the Paper Tray (P.36) A-2: How to Remove the Operation Panel Block(P.36) A-3: How to Remove the Operation Board and LCD(P.37) A-4: How to Remove the Image Sensor (CIS)(P.38)
  • Page 36 KX-FC379CX 6.1.2. Lower Cabinet Section CROSS REFERENCE: A-1: How to Remove the Paper Tray (P.36) B-1: How to Remove the Bottom Frame(P.42) B-2: How to Remove the Digital, Analog and Sensor Boards(P.43) B-3: How to Remove the Power Supply Board and AC cord(P.44) B-4: How to Remove the Gear Block and Separation Roller(P.45)

  • Page 37: Disassembly Procedure

    KX-FC379CX 6.2. DISASSEMBLY PROCEDURE 6.2.1. How to Remove the Paper Tray 6.2.2. How to Remove the Operation Panel Block...
  • Page 38 KX-FC379CX 6.2.3. How to Remove the Operation Board and LCD...
  • Page 39 KX-FC379CX 6.2.4. How to Remove the Image Sensor (CIS)
  • Page 40 KX-FC379CX 6.2.5. How to Remove the Thermal Head...
  • Page 41 KX-FC379CX 6.2.6. How to Remove the Back Cover 6.2.7. How to Remove the Platen Roller...
  • Page 42 KX-FC379CX 6.2.8. How to Remove the Pickup Roller and Antenna...
  • Page 43 KX-FC379CX 6.2.9. How to Remove the Cordless Base Board 6.2.10. How to Remove the Bottom Frame...
  • Page 44 KX-FC379CX 6.2.11. How to Remove the Digital, Analog and Sensor Boards...
  • Page 45 KX-FC379CX 6.2.12. How to Remove the Power Supply Board and AC cord...
  • Page 46 KX-FC379CX 6.2.13. How to Remove the Gear Block and Separation Roller...
  • Page 47 KX-FC379CX 6.2.14. How to Remove the Gears, Motors and Arms of the Gear Block...
  • Page 48 KX-FC379CX 6.2.15. Installation Position of the Lead Wires...
  • Page 49 KX-FC379CX 6.2.16. How to Remove the Antenna of Handset...
  • Page 50 KX-FC379CX 6.2.17. How to Remove the Handset Board and LCD...
  • Page 51 KX-FC379CX 6.2.17.1. Assembly the LCD to Handset Board...

  • Page 52: Troubleshooting Guide

    KX-FC379CX 7 TROUBLESHOOTING GUIDE 7.1. TROUBLESHOOTING SUMMARY 7.1.1. TROUBLESHOOTING After confirming the problem by asking the user, troubleshoot according to the instructions and observe the following precautions. 7.1.2. PRECAUTIONS 1. If there is a problem with the print quality or the paper feed, first check if the installation space and the print paper meets the specifications, the paper selection lever/paper thickness lever is set correctly, and the paper is set correctly without any slack.

  • Page 53: User Recoverable Errors

    KX-FC379CX 7.2. USER RECOVERABLE ERRORS If the unit detects a problem, one or more of the following messages will appear on the display. The explanations given in the [ ] are for servicemen only. 7.2.1. Base Unit • • • • The handset you tried to copy phone book items to is in use.
  • Page 54 — Use the overseas transmission mode (feature #23 on Program Mode Table (P.75)) • • • • .Please use genuine Panasonic replacement film. —Add 2 pauses at the end of the telephone number or dial • • • • The ink film is slack. Tighten it. Tighten it (See step 5 on manually.
  • Page 55 KX-FC379CX • • • • The handset’s registration may have been canceled. Re- register the handset. • • • • The unit is too hot. Stop using the unit for a while and let the unit cool down. 7.2.2. Handset •...

  • Page 56: Programming And Lists

    KX-FC379CX 7.3. PROGRAMMING AND LISTS The programming functions are used to program the various features and functions of the machine, and to test the machine. This facilitates communication between the user and the service man while programming the unit. 7.3.1.
  • Page 57 KX-FC379CX 7.3.3. Service Function Table Code Function Set Value Effective Default Remarks Range Pause time set X 100 msec 001~600 ---------- Dial speed select 1:10 pps 2:20 1, 2 ---------- VOX time 1:6 sec 2:4sec 1, 2 ---------- VOX sense...
  • Page 58 KX-FC379CX Code Function Set Value Effective Default Remarks Range Overseas DIS detection select 1:detects at 1, 2 See Symptom/Countermeasure Table for long the 1st time distance and international calls in The unit can copy, 2:detects at but cannot either transmit/receive long distance or the 2st time international communications (P.102).

  • Page 59: Test Functions

    KX-FC379CX 7.4. TEST FUNCTIONS The codes listed below can be used to perform simple checks for some of the unit’s functions. When complaints are received from customers, they provide an effective tool for identifying the locations and causes of malfunctions. To do this, you set the Service mode (Refer to Operation Flow (P.55).) first, then operate the below test items.
  • Page 60 KX-FC379CX 7.4.1. DTMF Single Tone Transmit Selection When set to ON (=1), the 12 keys and transmission When set to OFF (=2), the 12 keys and transmission frequencies are as shown. frequencies are as shown. High Frequency (Hz) Low Frequency (Hz)
  • Page 61 KX-FC379CX 7.4.3. Print Test Pattern 1. Platen roller 3. Thermal head 1 dot 2. Left margin / Top margin 4. Use this test pattern to confirm the torque limiter for Ink film and platen roller timing.
  • Page 62 KX-FC379CX 7.4.4. Test Mode Flow Chart for Cordless Base Unit 1. Press the [MENU] [#] [9] [0] [0] [0] [ ] [9] [5] [8] keys. LCD display on the cordless test mode LCD display: 2. Press the [SET] key and select test items by pressing [ ] key.
  • Page 63 KX-FC379CX 7.4.4.1. Test Burst Mode and Test TX-CW Mode...
  • Page 64 KX-FC379CX 7.4.4.2. RX-CW Test Mode...
  • Page 65 KX-FC379CX 7.4.4.3. Test Link Mode...
  • Page 66 KX-FC379CX 7.4.5. Test Mode Flow Chart for Handset 7.4.5.1. TX Burst Mode...
  • Page 67 KX-FC379CX 7.4.5.2. RX-CW TEST Mode...
  • Page 68 KX-FC379CX 7.4.5.3. Test Link Mode Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) for factory use only.
  • Page 69 KX-FC379CX 7.4.5.4. Adjustment flow (X´tal mode and Batt Low mode) Cross Reference (*1) Adjust Battery Low Detector Voltage (Handset) (P.69) Note: (*2) These are the default values. (*3) These values may not be fixed depending on the battery strength.
  • Page 70 KX-FC379CX 7.4.6. X201 (Handset RF) Check Equipment: Frequency counter Check Point for measurement: BCK (Handset) Checking tolerance: 13.824MHz ± 100Hz (Handset) 7.4.6.1. Adjustment X201 (Handset RF) Frequency 1. Set DC power supply to 3.9V. 2. Set up Handset in TEST mode (Adjustment flow).
  • Page 71 KX-FC379CX 7.4.8. Frequency Table Channel TX/RX Frequency TEST MODE Frequency Channel TX/RX Frequency TEST MODE Frequency (MHz) (MHz) (MHz) (MHz) 2400.914355 2400.724512 2457.994043 2457.804199 2401.808203 2401.618359 2458.887891 2458.698047 2402.698096 2402.508252 2459.777783 2459.587939 2403.591943 2403.402100 2460.671631 2460.481787 2404.481836 2404.291992 2461.561523 2461.371680 2405.375684...

  • Page 72: How To Clear User Setting

    KX-FC379CX 7.4.9. How to Clear User Setting Units are reset to the Factory settings by this operation (Erase recorded Voice messages, stored Phone numbers, Caller list and etc.). This operation should not be performed for a usual repair. 7.4.9.1. Base unit 7.4.9.2.

  • Page 73: Handset Reference Drawing

    KX-FC379CX 7.4.10. Handset Reference Drawing When connecting the Simulator and Equipments for checking, please refer to the illustration below. Note: (*1) is refered to No.3 of Check Table for RF part (P.143)
  • Page 74 KX-FC379CX 7.4.11. Cordless Base Unit Reference Drawing When connection the Simulator and Equipments for checking, plese refer to below. Spectrum Analyzer C205 1 C212 IC521 50 CABLE R205 ANTG IC201 C211 C521 C206 IC601 R207 R223 R228 ANTG C204 C209...

  • Page 75: Remote Programming

    KX-FC379CX 7.5. REMOTE PROGRAMMING If, after the call is connected, the customer describes the situation and it is determined that the problem can be corrected by making parameter changes, this function makes it possible to change parameters such as the user code and service code from another fax (using DTMF tones).
  • Page 76 KX-FC379CX 7.5.2. Program Mode Table Code Function Set Value Default Remote Setting Set date and time mm/dd/yy hh:mm Jan/01/2005 Your logo --------- None Your FAX number --------- None Print sending mode 1:ERROR / 2:ON / 3:OFF ERROR FAX ring count...
  • Page 77 KX-FC379CX Code Function Set Value Default Remote Setting Break % select 1:61% / 2:67% ITS auto redial time set 00~99 ITS auto redial line disconnection time set 001~999sec 065sec Remote turn-on ring number 01~99 TAM continuous tone detection 1:ON / 2:OFF...

  • Page 78: The Example Of The Printed List

    KX-FC379CX 7.6. THE EXAMPLE OF THE PRINTED LIST 7.6.1. User Mode Note: The above values are the default values.
  • Page 79 KX-FC379CX 7.6.2. Service Mode Settings Note: The above values are the default values.
  • Page 80 KX-FC379CX 7.6.3. History Note: See the following descriptions of this report. Item No. (1) ~ (44) are corresponding to the listed items in Descriptions of the History Report(P.80).
  • Page 81 KX-FC379CX 7.6.3.1. Descriptions of the History Report (1) SOFTWARE VERSION (22) NUMBER OF RECEIVE FLASH ROM version The number of pages received. (2) SUM (23) NUMBER OF SENDING FLASH ROM internal data calculation. The number of pages sent. (3) YOUR LOGO (24) NUMBER OF CALLER ID The user logo recorded in the unit.

  • Page 82: Troubleshooting Details

    KX-FC379CX 7.7. TROUBLESHOOTING DETAILS 7.7.1. Outline Troubleshooting is for recovering quality and reliability by determining the broken component and replacing, adjusting or cleaning it as required. First, determine the problem then decide the troubleshooting method. If you have difficulty finding the broken part, determine which board is broken.
  • Page 83 KX-FC379CX 7.7.3. Troubleshooting Items Table ITEM SYMPTOM REFERENCE The document does not feed. See No Document Feed (P.84) (Auto Document Feeder) Document jam See Document Jam (P.85) Multiple feed See Multiple Document Feed (P.86) Skew See Document Skew (P.87) Recording paper feed The recording paper does not feed.
  • Page 84 KX-FC379CX 7.7.3.1. Simple Check List SERIAL NO. DATE FUNCTION JUDGEMENT REFERENCE FAX operation Transmission OK / NG Receiving OK / NG Copy operation OK / NG Telephone operation Handset transceiver / receiver OK / NG SP-PHONE sound OK / NG...
  • Page 85 KX-FC379CX 7.7.4. ADF (Auto Document Feed) Section 7.7.4.1. No Document Feed CROSS REFERENCE: Digital Board Section(P.119) Power Supply Board Section(P.131) Sensor Section(P.135) TEST FUNCTIONS(P.58) How to Remove the Gear Block and Separation Roller(P.45) How to Remove the Gears, Motors and Arms of the Gear Block(P.46)
  • Page 86 KX-FC379CX 7.7.4.2. Document Jam CROSS REFERENCE: TEST FUNCTIONS(P.58) Sensor Section(P.135) DISASSEMBLY INSTRUCTIONS(P.34)
  • Page 87 KX-FC379CX 7.7.4.3. Multiple Document Feed • • • • When using thick paper etc., sometimes the document will not be fed. Fig. B CROSS REFERENCE: MAINTENANCE(P.24) DISASSEMBLY INSTRUCTIONS(P.34) Note: When confirming if the characters are extended or distorted, or if the feed problem is occurred, use this test chart format...
  • Page 88 KX-FC379CX 7.7.4.4. Document Skew * We recommend making a copy of the Fig. B document in Multiple Document Feed (P.86) and using it. CROSS REFERENCE: Maintenance Check Items/Component Locations(P.24) DISASSEMBLY INSTRUCTIONS(P.34)
  • Page 89 KX-FC379CX 7.7.4.5. The Recording Paper does not Feed * We recommend making a copy of the Fig. B document in Multiple Document Feed (P.86)and using it. CROSS REFERENCE: INSTALLING THE RECORDING PAPER(P.19) Digital Board Section(P.119) Power Supply Board Section(P.131) Sensor Section(P.135) TEST FUNCTIONS(P.58)
  • Page 90 KX-FC379CX 7.7.4.6. Paper Jam CROSS REFERENCE: Sensor Section(P.135) TEST FUNCTIONS(P.58) DISASSEMBLY INSTRUCTIONS(P.34) SENSORS AND SWITCHES(P.166)
  • Page 91 KX-FC379CX 7.7.4.7. Recording Paper Multiple Feed and Skew CROSS REFERENCE: How to Remove the Pickup Roller and Antenna(P.41) BACK COVER SECTION(P.210) 7.7.4.8. The Sent Fax Data is Skewed * We recommend making a copy of the Fig. B document in Multiple Document Feed(P.86) and using it.
  • Page 92 KX-FC379CX 7.7.4.10. Received or Copied Data is Expanded * We recommend making a copy of the Fig. B document in Multiple Document Feed(P.86) and using it. CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS(P.34)
  • Page 93 KX-FC379CX 7.7.4.11. A Blank Page is Copied * We recommend making a copy of the Fig. B document in Multiple Document Feed (P.86) and using it. CROSS REFERENCE: A Blank Page is Received(P.94) TEST FUNCTIONS(P.58) How to Remove the Thermal Head(P.39)
  • Page 94 KX-FC379CX...
  • Page 95 KX-FC379CX 7.7.4.12. A Blank Page is Received CROSS REFERENCE: A Blank Page is Copied(P.92) Check Sheet(P.126) TEST FUNCTIONS(P.58) 7.7.4.13. Black or White Vertical Line * We recommend making a copy of the Fig. B document in Multiple Document Feed (P.86) and using it.
  • Page 96 KX-FC379CX 7.7.4.14. Black or White Lateral Line on Print Out * We recommend making a copy of the Fig. B document in Multiple Document Feed(P.86) and using it. CROSS REFERENCE: A Blank Page is Copied(P.92) Digital Board Section(P.119) TEST FUNCTIONS(P.58)
  • Page 97 KX-FC379CX 7.7.4.15. An Abnormal Image is Printed * We recommend making a copy of the Fig. B document in Multiple Document Feed (P.86) and using it. CROSS REFERENCE: Check Sheet(P.126) TEST FUNCTIONS(P.58) How to Remove the Thermal Head(P.39)
  • Page 98 KX-FC379CX 7.7.5. Communication Section Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in Defective Facsimile Section P.98. Symptom Content Possible cause The paper is not fed properly when faxing. Troubleshooting Problem with the feeding (Nor in the copy mode.)
  • Page 99 KX-FC379CX 7.7.5.1. Defective Facsimile Section 7.7.5.1.1. Transmit Problem CROSS REFERENCE: MAINTENANCE(P.24) ADF (Auto Document Feed) Section(P.84) Operation Panel Section(P.134)
  • Page 100 KX-FC379CX 7.7.5.1.2. Sometime There is a Transmit Problem Note: "596: Transmit level set" represents a service code. (Refer to Service Function Table(P.56).)
  • Page 101 KX-FC379CX 7.7.5.1.3. Receive Problem First confirm whether the recording paper is installed properly or not before starting troubleshooting. (Refer to "Remarks".) Note: "596: Transmit level set" represents a service code. (Refer to Service Function Table(P.56).) Remarks: Regarding the reception problem, we have investigated the conceivable causes in the flow chart except for the software-related errors.
  • Page 102 KX-FC379CX 7.7.5.1.4. The Unit can copy, but cannot Transmit/Receive CROSS REFERENCE: Analog Board Section(P.126) TEST FUNCTIONS(P.58)
  • Page 103 KX-FC379CX 7.7.5.1.5. The unit can copy, but cannot either transmit/receive long distance or international communications The following two causes can be considered for this symptom. Cause 1: The other party is executing automatic dialing, the call has been received by this unit, and the CED or DIS signal response time is too long.
  • Page 104 KX-FC379CX (Causes and Countermeasures) Countermeasure Side Echo Communication Problem Example Countermeasure Service Code Sending side Some time is needed to compare the level Add a dummy signal to the beginning Service code (521) of the receiving and sending signals for the of the training signal.
  • Page 105 KX-FC379CX Fig. c (Countermeasure by Changing the Interval Between CED and DIS) Fig. d (C3ountemeasure by Ignoring the 1st DIS) <TX side signal> <RX side signal> <Countermeasure> 2nd / 3rd DCS / Training & delayed CFR / FTT at TX side 2nd / 3rd EOP / EOM / MPS &...
  • Page 106 KX-FC379CX 7.7.5.1.7. How To Record Fax Signal by using PC Recording FAX signal is one of the useful analysis measures to solve communication problems. The way of recording easily by using PC is shown as follows. 1. Equipment Parts No.
  • Page 107 KX-FC379CX 7.7.5.1.8. How to Output the Journal Report 1. Press [MENU] repeatedly to display “PRINT REPORT”. 2. Press [ ] or [ ] until the “ JOURNAL REPORT ” is displayed. 3. Press [SET] . 4. The report is printed out.
  • Page 108 KX-FC379CX...
  • Page 109 KX-FC379CX CROSS REFERENCE: TEST FUNCTIONS(P.58)
  • Page 110 KX-FC379CX CROSS REFERENCE: TEST FUNCTIONS(P.58)
  • Page 111 KX-FC379CX CROSS REFERENCE: TEST FUNCTIONS(P.58)
  • Page 112 KX-FC379CX CROSS REFERENCE: TEST FUNCTIONS(P.58)
  • Page 113 KX-FC379CX...
  • Page 114 KX-FC379CX...
  • Page 115 KX-FC379CX CROSS REFERENCE: TEST FUNCTIONS(P.58)
  • Page 116 KX-FC379CX 7.7.5.2. Special Service Journal Reports Journal 2 and Journal 3 shown below, which are special journals giving the additional detailed information about the latest 35 communications, can be printed by Service Code 881 or 882. Remote printing function for the journal reports (JOURNAL, JOURNAL 2 and JOURNAL 3) is also available for service technicians.
  • Page 117 KX-FC379CX 7.7.5.2.1. Journal 2 Refer to JOURNAL 2 in Printout Example(P.117). Journal 2 displays the additional detailed information about the last 35 communications. Descriptions: (1) RCV. MODE Indicates which receive mode the unit was in when the unit received a fax message.
  • Page 118 KX-FC379CX 7.7.5.2.2. Journal 3 Refer to JOURNAL 3 in Printout Example (P.117). Descriptions: (6) ENCODE (9) ERROR LINE(RX) Compression Code: MH/MR When an error occurs while receiving a fax, this shows the number of error lines. (7) MSLT (10) MAKER CODE MSLT means Minimum Scan Line Time.
  • Page 119 KX-FC379CX...
  • Page 120 KX-FC379CX 7.7.6. Digital Board Section When the unit fails to boot up the system, take the troubleshooting procedures very carefully. It may have a serious problem. The symptom: No response when the power is turned on. (No LCD display, and keys are not accepted.) The first step is to check the power source.
  • Page 121 KX-FC379CX 7.7.6.1. Digital Block Diagram You also need to check the signal lines listed here [List 1] when the unit fails to boot up the system. Those signal lines should remain normal. Other signal lines are not directly related to that failure even if they have faults or troubles.
  • Page 122 KX-FC379CX Normal Wave Patterns Remarks: When you use an oscilloscope to judge whether a signal to be tested is normal or NG, perform the signal check in exactly the same order as in [List 1]. (If the ASIC fails to access the FLASH ROM, the ASIC cannot access DRAM normally.) The digital circuit actually operates according to the timing combinations of these signals.
  • Page 123 KX-FC379CX I/O and Pin No. Diagram...
  • Page 124 KX-FC379CX 7.7.6.2. Check the Status of the Digital Board First, please check voltages and oscillation whether they are correct as follows.
  • Page 125 KX-FC379CX Other NG example while the power is ON and the LCD displays the following.
  • Page 126 KX-FC379CX 7.7.6.3. NG Example...
  • Page 127 KX-FC379CX 7.7.7. Analog Board Section This chapter provides the testing procedures required for the analog parts. A signal route to be tested is determined depending upon purposes. For example, the handset TX route begins at the handset microphone and the signal is output to the telephone line.
  • Page 128 KX-FC379CX...
  • Page 129 KX-FC379CX 7.7.7.2. Defective ITS (Integrated Telephone System) Section 1. No handset transmission / reception and no monitor reception Perform a signal test in the ITS or the NCU section and locate a defective point (where the signal disappears) on each route...

  • Page 130: Digital Speakerphone

    KX-FC379CX 7.7.8. Digital Speakerphone The digital speakerphone has different features from the analog speakerphone. The analog speakerphone switches between Tx or Rx. Either Tx or Rx is able to pass through a telephone line or speaker, depending on the Tx and Rx signal (voice) level. The higher-level signal (either TX or RX) can pass through the route.
  • Page 131 KX-FC379CX Note: Check to the SP-Phone Rx/Tx signal routes. (Refer to Check Sheet (P.126)).
  • Page 132 KX-FC379CX 7.7.9. Power Supply Board Section 7.7.9.1. Key Components for Troubleshooting Check the following parts first: F101, D101-D104, C106, Q101, PC101 and IC101. This comes from our experience with experimental tests. For example: power supply and lightning surge voltage test, withstanding voltage test, intentional short circuit test, etc.
  • Page 133 KX-FC379CX 7.7.9.2. Troubleshooting Flow Chart...
  • Page 134 KX-FC379CX 7.7.9.3. Broken Parts Repair Details (D101, D102, D103, D104) Check for a short-circuit in terminal 4. If D101, D102, D103 and D104 are short-circuits, F101 will melt (open). In this case, replace all of the parts (D101, D102, D103, D104, F101).
  • Page 135 KX-FC379CX 7.7.10. Operation Panel Section 7.7.10.1. No Key Operation CROSS REFERENCE: TEST FUNCTIONS(P.58) 7.7.10.2. No LCD Indication CROSS REFERENCE: TEST FUNCTIONS(P.58)
  • Page 136 KX-FC379CX 7.7.11. Sensor Section Refer to SENSORS AND SWITCHES(P.166) for the circuit descriptions. The Test Function makes the sensor circuit check easier. (Refer to TEST FUNCTIONS(P.58).) For example, as for "FILM END/COVER OPEN SENSOR", "CO" is turned ON/OFF on the display when you open or close the cover.
  • Page 137 KX-FC379CX 7.7.11.4. Check the Paper Top SW (SW402)......"PAPER JAMMED" 7.7.11.5. Check the FILM SENSOR (SW401)......"CHECK FILM SLACK"...
  • Page 138 KX-FC379CX 7.7.12. CIS (Contact Image Sensor) Section Refer to Scanning Block(P.163). CROSS REFERENCE: TEST FUNCTIONS(P.58)
  • Page 139 KX-FC379CX 7.7.13. Thermal Head Section Refer to Thermal Head(P.161).
  • Page 140 KX-FC379CX 7.7.14. Cordless Section 7.7.14.1. Battery won’t Charge (Analog 7.7.14.3. No Voice Reception Board) 7.7.14.2. Battery won’t Charge (Handset) CROSS REFERENCE: Check Sheet(P.126).

  • Page 141: Check Link

    KX-FC379CX 7.7.14.4. No Voice Transmission 7.7.15. Check Link CROSS REFERENCE: Check Sheet(P.126). CROSS REFERENCE: Check the RF Part(P.141). Power Supply Circuit(P.195).
  • Page 142 KX-FC379CX 7.7.16. Check the RF Part 7.7.16.1. Finding Out the Defective Part After All the Checkings or Repairing Re-register Handset (to be checked) to Base Unit (to be checked) and HS to BU Regular unit (working). 7.7.16.1.1. Re-registering a Handset...
  • Page 143 KX-FC379CX 7.7.16.1.2. RF Check Flowchart Each item (1 ~ 6) of RF Check Flowchart corresponds to Check Table for RF part (P.143). Please refer to the each item.
  • Page 144 KX-FC379CX 7.7.16.1.3. Check Table for RF part Item BU (Base Unit) Check HS (HandSet) Check Link Confirmation Normal 1. Register Regular HS to BU (to be checked). 1. Register HS (to be checked) to Regular BU. 2. Press [Talk] key of the Regular HS to 2.
  • Page 145 KX-FC379CX 7.7.16.1.4. TEST RANGE Check Circuit block which range is defective can be found by the following check. Item BU (Base Unit) Check HS (HandSet) Check Range Confirmation TX 1. Register Regular HS to BU (to be checked). 1. Register HS (to be checked) to Regular BU.
  • Page 146 KX-FC379CX 7.7.16.1.5. RF-DSP interface signal wave form...

  • Page 147: Check Handset Transmission

    KX-FC379CX 7.7.16.2. Check Handset Transmission Cross Reference: Check Sheet (P.126). 7.7.16.3. Check Handset Reception Cross Reference: Check Sheet (P.126). Note: When checking the RF UNIT, Refer to Check the RF Part (P.141) 7.7.16.4. Check Caller ID Cross Reference: Bell Detection Circuit (P.178) Calling Line Identification Circuit (P.180)

  • Page 148: Circuit Operations

    KX-FC379CX 8 CIRCUIT OPERATIONS 8.1. CONNECTION DIAGRAM...

  • Page 149: General Block Diagram

    KX-FC379CX 8.2. GENERAL BLOCK DIAGRAM The following is an outline of each device IC on the digital board. (Refer to General Block Diagram(P.149).). 1. ASIC (IC501) Composed mainly of an address decoder and a modem control. Controls the general FAX operations.
  • Page 150 KX-FC379CX 8.2.1. General Block Diagram CROSS REFERENCE: Analog Board Block Diagram (P.177) Cordless Base Board Block Diagram (P.193)

  • Page 151: Control Section

    KX-FC379CX 8.3. CONTROL SECTION 8.3.1. Block Diagram...
  • Page 152 KX-FC379CX 8.3.2. Memory Map...
  • Page 153 KX-FC379CX 8.3.3. ASIC (IC501) This custom IC is used for the general FAX operations. 6. IMAGE DATA RAM: 1. CPU: This memory is programmed into the ASIC and uses 8 KB for the image processing. (See Fig. A.*) This model uses a Z80 equivalent to the CPU operating at 12 MHz.
  • Page 154 KX-FC379CX 8.3.4. Flash ROM (IC502) The 512KB ROM (FLASH ROM) carries a common area of 32KB and bank areas which each have 8KB (BK4~BK63). The addresses from 0000H to 7FFFH are for the common area and from 8000H to 9FFFH are for the bank areas.
  • Page 155 KX-FC379CX SIGNAL POWER SUPPLIED DESCRIPTION VOLTAGE VDD (3.3V) ----- POWER SOURCE (+3.3V) XTEST 3.3V 24.576MHz CLOCK TEST1 3.3V HIGH FIXED TEST2 3.3V HIGH FIXED TEST3 3.3V HIGH FIXED TEST4 3.3V HIGH FIXED XMDMINT 3.3V MODEM INTERRUPT XMDMCS 3.3V MODEM CHIP SELECT XRAS/IOP 3.3V...
  • Page 156 KX-FC379CX SIGNAL POWER SUPPLIED DESCRIPTION VOLTAGE RM0/IOP 3.3V MOTOR A PHASE RM1/IOP 3.3V MOTOR B PHASE RM2/IOP 3.3V MOTOR /A PHASE RM3/IOP 3.3V MOTOR /B PHASE RXE/IOP 3.3V MOTOR ENABLE SIGNAL 3.3V MOTOR A PHASE VDD (2.5V) ----- POWER SOURCE (+2.5V)
  • Page 157 KX-FC379CX 8.3.6. Reset Circuit (Watch dog timer) The output signal (reset) from pin 4 of the voltage detect IC (IC507) is input to the ASIC (IC501) 114 pin. 1. During a momentary power interruption, a reset pulse of 50~70 msec is generated and the system is reset completely.
  • Page 158 KX-FC379CX 8.3.7. RTC Backup Circuit 1. Function This unit has a lithium battery (BAT501) which works for Real Time Clock IC (RTC: inside IC501). The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
  • Page 159 KX-FC379CX 8.3.8. Supervision Circuit for the Thermal Head Temperature 1. Function The thermistor changes the resistor according to the temperature and uses the thermistor´s characteristics. The output of pin 139 of IC501 becomes a low level. Then when it becomes a high level, it triggers point A In point C, according to the voltage output time, the thermal head´s temperature is detected.

  • Page 160: Facsimile Section

    KX-FC379CX 8.4. FACSIMILE SECTION 8.4.1. Image Data Flow during facsimile Operation Copy (Fine, Super-Fine, Half Tone) 1. Line information is read by CIS (to be used as the reference white level) via route1, and is input to IC501. Refer to Block Diagram(P.160)
  • Page 161 KX-FC379CX 8.4.2. Block Diagram...

  • Page 162: Thermal Head

    KX-FC379CX 8.4.3. Thermal Head 1. Function This unit utilizes the state of the art thermal printer technology. The ink film is chemically processed. The ink film is comprised of two parts: an ink layer and a base film. When the thermal head contacts this ink film, it emits heat momentarily, and the ink layer is melted and transferred to the paper.
  • Page 163 KX-FC379CX...
  • Page 164 KX-FC379CX 8.4.4. Scanning Block The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED array, and photoelectric conversion elements. When an original document is inserted and the start button pressed, pin 64 of IC501 goes to a low level and Q520 are turned ON, pin 21 of IC501 goes to a high level and the transistor Q507 turns on.This applies voltage to the LED array to light it.
  • Page 165 KX-FC379CX 8.4.5. Stepping Motor Drive Circuit (RX) 1. Function The stepping motor works for reception. 2. Motor During motor driving, pin 124 of ASIC IC501 becomes a high level, and Q503, Q502 turns ON. As a result, +24V is supplied to the motor coil.
  • Page 166 KX-FC379CX 8.4.6. Stepping Motor Drive Circuit (TX) 1. Function The stepping motor works for transmission. 2. Motor During motor driving, pin 131 of ASIC IC501 becomes a high level, and Q504, Q508 turns ON. As a result, +24V is supplied to the motor coil.

  • Page 167: Sensors And Switches

    KX-FC379CX 8.5. SENSORS AND SWITCHES All of the sensor and switches are shown below. Sensor Circuit Sensor Sensor or Switch Name Message Error Location Operation Panel PS301 Document set Sensor [CHECK DOCUMENT] SW351 Document top SW [REMOVE DOCUMENT] Digital PCB...
  • Page 168 KX-FC379CX 8.5.1. Document Top SW (SW351)...."REMOVE DOCUMENT" When a document is brought to the read position, the SW turns ON, and the input signal of IC301-16 pin (Operation) becomes a low level. When there is no document at the read position, the SW turns OFF, and the input signal of IC301-16 pin (Operation) becomes a high level.
  • Page 169 KX-FC379CX 8.5.3. Cover open / Film end SW (SW501)...."COVER OPEN " or "CHECK FILM" When the operation panel cover is closed and a film is set, the SW turns ON, and the input signal of IC501-23 pin (Digital) becomes a low level. When the cover is opened, the SW turns OFF, and the input signal of IC501-23 pin (Digital) becomes a high level.

  • Page 170: Modem Section

    KX-FC379CX 8.6. MODEM SECTION 8.6.1. Function The unit uses a 1 chip modem (IC505) that serves as an interface between the control section for FAX transmission and reception and the telephone line. During a transmitting operation, the digital image signals are modulated and sent to the telephone line.
  • Page 171 KX-FC379CX 3. Facsimile Call Time Series As shown in the following diagram, the facsimile call time series is divided into five phases. Phase A : Call setting Call setting can be manual/automatic. Phase B : Pre-message procedure Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc., and for terminal control.
  • Page 172 KX-FC379CX 6. Explanation of Communication and Compression Technology a. G3 Communication Signals (T. 30 Binary Process) For G3 Facsimile communication, this is the procedure for exchanging control signals between the sending and receiving machines both before and after transmission of image signals.
  • Page 173 KX-FC379CX Bit No. DIS/DTC Reserved for future T.3 operation features. Transmitter --- T.4 operation Receiver --- T.4 operation Receiver --- T.4 operation 11, 12, 13, 14 Data signaling rate Data signaling rate 0, 0, 0, 0 V.27 ter fall back mode 2400 bit/s, V.27 ter...
  • Page 174 KX-FC379CX Bit No. DIS/DTC 300×300 pels/25.4 mm 300×300 pels/25.4 mm R16×15.4 lines/mm and/or 400×400 pels/25.4 mm R16×15.4 lines/mm and/or 400×400 pels/25.4 mm Inch based resolution preferred Resolution type selection "0" : neuritic based resolution "1" : inch based resolution Metric based resolution preferred Don’t care...
  • Page 175 KX-FC379CX b. Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format.
  • Page 176 KX-FC379CX 8.6.2. Modem Circuit Operation The modem (IC505) has all the hardware satisfying the ITU-T standards mentioned previously. When the ASIC IC501 (61) is brought to a low level, the modem (IC505) is chip-selected and the resistors inside IC are selected by the select signals from ASIC (IC501) ADR0-ADR4(pin 83~87).

  • Page 177: Description Of Block Diagram In Analog Section

    KX-FC379CX 8.7. DESCRIPTION OF BLOCK DIAGRAM IN ANALOG SECTION 1. Function The analog section serves as an interface between the telephone line. The digital board (IC505) for transmission and reception of FAX signals, switches between the digital board (IC505) and other sections by means of a multiplexer in the NCU section.
  • Page 178 KX-FC379CX 8.7.1. Analog Board Block Diagram...

  • Page 179: Ncu Section

    KX-FC379CX 8.8. NCU SECTION 8.8.1. General It is composed of bell detection circuit, pulse dial circuit, TAM interface circuit, line amplifier, sidetone circuits, Remote FAX activation circuit, CPC detection, and a multiplexer. 8.8.2. Remote Fax Activation Circuit 1. Circuit Operation After detecting the bell signal, another telephone connected to the same line switches to the FAX mode by DTMF signal.

  • Page 180: Auto Disconnect Circuit

    KX-FC379CX 8.8.5. Line Amplifier and Side Tone Circuit 1. Circuit Operation The reception signal output from the line transformer T101 is input to pin (6) of IC103 via C118, R125 and then the signal is amplified at pin (7) of IC103 and sent to the reception system at 3dB.
  • Page 181 KX-FC379CX 8.8.8. Calling Line Identification Circuit 1. Function This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must subscribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the first and second rings of the bell signal.
  • Page 182 KX-FC379CX Call Waiting Calling Identity Delivery on Call Waiting (CIDCW) is a CLASS service that allows a customer, while off-hook on an existing call, to receive information about a calling party on a waited call. The transmission of the calling information takes place almost immediately after the customer is alerted to the new call so he/she can use this information to decide whether to take the new call.

  • Page 183: Its (Integrated Telephone System) And Monitor Section

    KX-FC379CX 8.9. ITS (Integrated Telephone System) AND MONITOR SECTION 8.9.1. General During the monitor operation, the speaker output passes through the power amplifier (IC102) [Analog board]. The DTMF signal is output from the modem (IC505: digital board). The alarm tone, the key tone, bell tone, and beep are output from gate array IC501 (digital board).

  • Page 184: Operation Board Section

    LCD MODULE ASIC CN302 KSL0~4 CN504 CN301 GATE ARRAY IC501 IC301 KEYS KIN0~7 MATRIX XL11, 12, 13 LED2 AUTO ANSWER DOCUMENT TOP SW DOCUMENT SET SW CHARGE LED DIGITAL BOARD OPERATION BOARD KX-FC379CX : OPERATION BOARD BLOCK DIAGRAM Key Matrix...

  • Page 185: Lcd Section

    KX-FC379CX 8.12. LCD SECTION The Gate Array (IC301) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplied for the crystal drive. R303, R305 and R306 are density control resistors. Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC301).

  • Page 186: Power Supply Board Section

    KX-FC379CX 8.13. POWER SUPPLY BOARD SECTION This power supply board uses the switching regulator method. [Input Circuit] The input current goes into the input rectifier circuit through the filter circuit. The filter circuit decreases the noise voltage and the noise electric field strength.
  • Page 187 KX-FC379CX The following is an overview of how the power supply unit is controlled. The control method of this power supply unit is pulse width modulation. When Q is ON, the energy is charged in the transfer primary coil according to E .
  • Page 188 KX-FC379CX [Surge Absorber Circuit] This circuit is for absorbing surge voltage generated by the transformer. [Control Circuit and Detecting Circuit] The control circuit amplifies the output with increased voltage detected in the error detecting circuit. Then it drives the main transistor.

  • Page 189: Cordless Section (Base Unit)

    KX-FC379CX 8.14. CORDLESS SECTION (BASE UNIT) 8.14.1. Description 8.14.1.1. Frequency The frequency range of 2400MHz~2480MHz is used. Transmitting and receiving channel between base unit and handset is same frequency. Refer to the Frequency Table. 8.14.1.2. FHSS (Frequency Hopping Spread Spectrum) This telephone is using an IC chip which has similar specification to WDCT (World Digital Cordless Telephone) and is the cordless telephone system that can use multiple portable unit simultaneously.
  • Page 190 KX-FC379CX 8.14.1.2.1. TDD Frame Format 8.14.1.2.2. TDMA system This system is the cycles of 10ms, and has four duplex paths, so it is possible to perform four duplex communications simultaneously. In 1 slot 1.25ms, the 10ms of voice data is transmitted.

  • Page 191: Signal Flowchart In The Whole System

    KX-FC379CX 8.14.1.3. Signal Flowchart in the Whole System Reception CN101 of the base unit is connected to the line from TEL line. While talking, the signal through analog board and digital board, then led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with FHSS to TX-DATA. The TX-DATA signal is entered to IC901 of RF UNIT, and modulated to 2.4GHz.
  • Page 192 KX-FC379CX 8.14.2. Explanation Of Link Data Communication 8.14.2.1. Calling 8.14.2.2. To Terminate Communication 8.14.2.3. Ringing...
  • Page 193 KX-FC379CX 8.14.3. Charge Circuit (on Analog Board) Ultra charge (135 mA) of maximum 9 hours is started soon after the Handset is placed on the base unit. Finally the mode changes to trickle charge (20 mA) to prevent overcharging. 8.14.4. Line Sending Signal Refer to Signal Flowchart in the Whole System (P.190).
  • Page 194 KX-FC379CX 8.14.6. Cordless Base Board Block Diagram...

  • Page 195: Cordless Section (Handset)

    KX-FC379CX 8.15. CORDLESS SECTION (HANDSET) 8.15.1. Block Diagram IC202 D213 MOD_EN RXGAIN RSTN D207 D208 IC205 D205 D206 IC203 VBATT2 3.0V IC201 HSMIP HSMIN IC204 2.5V KX-FC379CX BLOCK DIAGRAM (Handset)

  • Page 196: Power Supply Circuit

    KX-FC379CX 8.15.1.1. Construction The circuit mainly consists of DSP and RF unit as shown in the block diagram. 8.15.1.2. DSP: IC201 Function • • • • Battery Low, Power down detect circuit • • • • Ringer Generation • • • • Interface circuit RF unit, speaker, mic, LED, Key scan, LCD, Headset 8.15.1.3.

  • Page 197: Charge Circuit

    KX-FC379CX 8.15.1.7. Charge Circuit When the handset is put on the cradle of the Base unit, the power is supplied from CHARGE2 and CHARGE1 terminals to charge the battery via D205 (D207), R268, Q212. The voltage between CHARGE2 and CHARGE1 flows D213 -> R248 -> Q207 ->...

  • Page 198: Sending Signal

    KX-FC379CX 8.15.1.9. Sending Signal The voice signal from the microphone input to DSP (42-43). CN203 is the headset jack. When the headphone is connected, the Q206 detect it. The input from the microphone of the handset (MIN, MIP) is cut and the microphone signal from the headset is input to DSP (39).

  • Page 199: Cpu Data (Cordless Base Board)

    KX-FC379CX 8.16. CPU DATA (Cordless Base Board) 8.16.1. IC501 Description High High_Z 64 TXEN Enable Disable Description High High_Z 65 RX_GAIN High_Gain Low_gain INT0 High 66 RXI High High 67 NC BELL_TX High 68 NC 69 NC ACDOWN High 70 RF_RESET...

  • Page 200: Cpu Data (Handset)

    KX-FC379CX 8.17. CPU DATA (Handset) Description High High_Z 60 (FLASH_SI) High 8.17.1. IC201 61 (FLASH_CS) Normal 62 OSC_Buf Description High High_Z 63 RXEN Active Normal 64 TXEN Active Normal 65 RXGAIN High DOT_LCD_RS Data Instruct 66 RXI DOT_LCD_RW_ Read Write...

  • Page 201: Explanation Of Rf Unit Terminals (Rf Unit)

    KX-FC379CX 8.18. EXPLANATION OF RF UNIT TERMINALS (RF Unit) 8.18.1. IC901...

  • Page 202: Reference Material Data

    KX-FC379CX 9 REFERENCE MATERIAL DATA 9.1. TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES...

  • Page 203: How To Replace The Flat Package Ic

    KX-FC379CX 9.2. HOW TO REPLACE THE FLAT PACKAGE IC Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
  • Page 204 KX-FC379CX 9.2.3. Flat Package IC Installation Procedure 1. Temporarily fix the FLAT PACKAGE IC, soldering the two marked pins. *Check the accuracy of the IC setting with the corresponding soldering foil. 2. Apply flux to all pins of the FLAT PACKAGE IC.

  • Page 205: Test Chart

    KX-FC379CX 9.3. TEST CHART 9.3.1. ITU-T No.1 Test Chart...
  • Page 206 KX-FC379CX 9.3.2. ITU-T No.2 Test Chart...

  • Page 207: Fixtures And Tools

    KX-FC379CX 10 FIXTURES AND TOOLS...

  • Page 208: Cabinet, Mechanical And Electrical Parts

    KX-FC379CX 11 CABINET, MECHANICAL AND ELECTRICAL PARTS LOCATION 11.1. GENERAL SECTION...

  • Page 209: Operation Panel Section

    KX-FC379CX 11.2. OPERATION PANEL SECTION Note: The capacitor (Ref. No. 26) is not included in the Microphone. When you order the Microphone for replacing, please also order the capacitor.

  • Page 210: Upper Cabinet Section

    KX-FC379CX 11.3. UPPER CABINET SECTION...

  • Page 211: Back Cover Section

    KX-FC379CX 11.4. BACK COVER SECTION...
  • Page 212 KX-FC379CX...
  • Page 213 KX-FC379CX...

  • Page 214: Lower Cabinet / P.c.board Section

    KX-FC379CX 11.5. LOWER CABINET / P.C.BOARD SECTION CROSS REFERENCE: GEAR BLOCK SECTION (P.214)

  • Page 215: Gear Block Section

    KX-FC379CX 11.6. GEAR BLOCK SECTION...

  • Page 216: Handset Section

    KX-FC379CX 11.7. HANDSET SECTION...

  • Page 217: Screws

    KX-FC379CX 11.8. SCREWS...

  • Page 218: Accessories And Packing Materials

    KX-FC379CX 12 ACCESSORIES AND PACKING MATERIALS...

  • Page 219: Replacement Parts List

    KX-FC379CX 13 REPLACEMENT PARTS LIST 1. RTL (Retention Time Limited) Ref. Part No. Part Name & Description Remarks Note: PFBC1112Z1 PUSH BUTTON, SP-PHONE ABS+HB The marking (RTL) indicates that the Retention Time is BB17M3M3 LEAD WIRE, EARTH PFUS1170Z COIL SPRING, DOC. LEVER limited for this item.
  • Page 220 KX-FC379CX Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFDG1339Z GEAR, PLATEN POM+HB PFJS03P72Y CONNECTOR, 3 PIN PFUS1466Z TORSION SPRING EARTH PLATEN PQMX10010Z COVER, TUBE PFUS1470Z COIL SPRING, BACK TENSION PQJS02Q59W CONNECTOR, 2 PIN...

  • Page 221: Digital Board Parts

    KX-FC379CX Ref. Part No. Part Name & Description Remarks 13.1.9. Accessories and Packing Materials Ref. Part No. Part Name & Description Remarks (BATTERY) BAT501 PFSU1004Z LITHIUM BATTERY PFJA02B002Y CORD, TELEPHONE PQKE10375Z3 HANGER (CONNECTORS) PFKS1089Z1 GUIDE, A4 SPACER PS+HB S CN501...
  • Page 222 KX-FC379CX Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R524 ERJ3GEYJ101 R717 ERJ3GEYJ102 R525 ERJ3GEYJ472 4.7k R734 ERJ3GEYJ472 4.7k R526 ERJ3EKF1101 1.1k R745 ERJ3GEY0R00 R528 ERJ3GEYJ472 4.7k R748 ERJ3GEY0R00 R529 ERJ3EKF3602 R749...

  • Page 223: Analog Board Parts

    KX-FC379CX Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C566 ECUV1E104ZFV C569 ECUV1E104ZFV (TRANSISTORS) C575 ECUV1E104ZFV Q103 PQVTDTC143E TRANSISTOR(SI) C578 ECUV1E104ZFV Q104 2SC4081S TRANSISTOR(SI) C583 ECUV1E104ZFV Q106 B1AAKL000006 TRANSISTOR(SI) C598 ECUV1H080DCV Q231...

  • Page 224: Operation Board Parts

    KX-FC379CX Ref. Part No. Part Name & Description Remarks 13.4. OPERATION BOARD PARTS R114 ERJ3GEY0R00 Ref. Part No. Part Name & Description Remarks R115 ERJ3GEYJ911 R116 ERJ3GEYJ202 PCB3 PFWP2FPG379M OPERATION BOARD ASS´Y (RTL) R118 ERJ3GEYJ563 R119 ERJ3GEYJ563 (ICs) R125 ERJ3GEYJ393...

  • Page 225: Power Supply Board Parts

    KX-FC379CX Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R315 ERJ3GEYJ101 (CONNECTORS) R316 ERJ3GEYJ472 4.7k CN301 PQJP7G30Y CONNECTOR, 7 PIN R317 ERJ3GEYJ101 CN302 PQJP2G30Y CONNECTOR, 2 PIN R318 ERJ3GEYJ4R7 CN31 PQJP2D98Z CONNECTOR, 2 PIN...

  • Page 226: Cordless Base Board Parts

    KX-FC379CX Ref. Part No. Part Name & Description Remarks 13.6. CORDLESS BASE BOARD R220 ERJ3GEY0R00 PARTS R221 ERJ3GEY0R00 R222 ERJ3GEYJ101 Ref. Part No. Part Name & Description Remarks R223 ERJ3GEYJ103 R224 ERJ3GEYJ472 4.7k PCB5 PFLP1634CXZ CORDLESS BASE BOARD ASS´Y R227...

  • Page 227: Handset Board Parts

    KX-FC379CX Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C808 ECST0JY106 D208 B0JCMD000010 DIODE(SI) C809 ECUV1H030CCV D213 MA132WK DIODE(SI) C810 ECUV1C104KBV D217 MA8047 DIODE(SI) C812 ECUV1C104KBV D218 MA8047 DIODE(SI) C813 ECUV1C104KBV D219...

  • Page 228: Sensor Board Parts

    KX-FC379CX Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R264 ERJ2GEJ473 C308 F1G0J1050007 R266 ERJ2GEJ102 C309 ECUE1A104KBQ R268 ERJ3GEYJ102 C311 ECUE1H3R0CCQ R269 ERJ3GEYJ102 C312 ECUE1A104KBQ R270 ERJ3GEYJ102 C901 ECUE1H100DCQ R275 ERJ2GEJ104 100k...
  • Page 229 KX-FC379CX Ref. Part No. Part Name & Description Remarks PQZZ7K5Z EXTENSION CORD, 7 PIN PQZZ8K18Z EXTENSION CORD, 8 PIN PFZZ5K13Z EXTENSION CORD, 5 PIN EC10 PQZZ5K6Z EXTENSION CORD, 5 PIN EC11 PQZZ3K5Z EXTENSION CORD, 3 PIN EC12 PQZZ13K9Z EXTENSION CORD, 13 PIN...

  • Page 230: Printed Circuit Board

    KX-FC379CX 24V1 C512 R535 R524 C508 L540 R719 R712 C720 R711 C714 C686 C688 C566 C569 C578 C736 C739 C738 R561 C703 R567 C704 C702 L535 C690 R565 L538 C598 R686 C539 R685 C705 C520 C553 C530 R684 R558 C563...
  • Page 231 KX-FC379CX CN513 R525 R534 AUTO-CH CN501 R710 C687 L510 L515 MODEL R707 R742 R708 C684 R709 R760 C685 L537 C672 R782 L520 R691 R705 R751 IC521 R690 R579 C712 C549 R576 C669 C711 C670 R787 C678 R779 C677 R704 C681...
  • Page 232 KX-FC379CX CN201 CN109 CN105 PFUP1467Z-A...
  • Page 233 KX-FC379CX CN201 J167 J145 C508 J166 CN109 J168 Q236 C158 R295 C191 Q231 D108 J161 T101 R159 R135 J163 C316 J156 C123 ZNR101 J152 R169 J164 L103 Q106 J142 C133 C157 J150 SA102 C156 CN105 J139 PC102 LF101 POS101 R103...

  • Page 234: Operation Board (Pcb3)

    KX-FC379CX LED303 BLUE J391 L352 C360 CN301 R363 C352 C359 D351 JJ329 JJ309 C304 L351 C354 C353 R354 R355 J351 C355 R360 R356 R352 C356 R325 R351 IC351 JJ327 JJ330 C319 C358 R361 C305 R326 R367 C308 R369 R358 C351...

  • Page 235: Power Supply Board (Pcb4)

    KX-FC379CX...

  • Page 236: Cordless Base Board (Pcb5)

    KX-FC379CX PFUP1468Z TP_DMOD JJ205 C215 C605 C608 C630 C629 C811 C628 C606 R807 R212 C518 C813 C208 C809 C805 C441 Q800 C804 R801 C806 C502 R508 X801 C321 C207 C210 R502 R216 R224 R211 R217 R210 R221 R209 C213 R208...
  • Page 237 KX-FC379CX...
  • Page 238 KX-FC379CX...
  • Page 239 KX-FC379CX 15 FOR THE SCHEMATIC DIAGRAMS Note: 1. DC voltage measurements are taken with an oscilloscope or a tester with a ground. 2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

  • Page 240: Schematic Diagram

    KX-FC379CX 16 SCHEMATIC DIAGRAM 16.1. DIGITAL BOARD (PCB1) +24V2 +24V1 +24V +5VD +5VA +24V +5VD +5VA D[6] 4M FLASH 4M FLASH D[7] for PROGRAM AG_M 4M DRAM for VOICE +3.3VD IC503 IC502 IC518 RA510 C612 A[0] A[0] 20 A0 D[0]...
  • Page 241 Q520 Q507 C559 VIDEO AG_M +3.3VD C715 Z0.1u Z0.1u AG_M +24V2 L517 L516 CN509 R750 C695 R717 C697 1 MIC+ K0.1u Default: OFF (0V) 2 MIC- CN503 TO MIC 3 MIC- AG_M TO CIS KX-FC379CX : DIGITAL BOARD SCHEMATIC DIAGRAM...

  • Page 242: Analog Board (Pcb2)

    KX-FC379CX 16.2. ANALOG BOARD (PCB2) +5VA +5VA R265 R266 PC106 R263 C515 Q115 C316 R168 D111 PC105 Q106 6.8K C516 C115 +5VA K390p R118 R125 C118 K0.1u R112 C112 K0.1u R114 R113 3.9K C113 C184 +2.0V C306 K220p C514 R271...
  • Page 243 +24V1 250V1u PC102 R103 15K 1/2W JJ114 Q236 R300 Q232 R292 CH(+) +5VA (10) +5VA L213 CH(-) (11) Q231 Q237 (12) Q233 TO SPEAKER CN105 (13) 1 1 SP(+) 2 2 SP(-) (14) (15) KX-FC379CX : ANALOG BOARD SCHEMATIC DIAGRAM...
  • Page 244 KX-FC379CX...
  • Page 245 KX-FC379CX...
  • Page 246 KX-FC379CX 16.5. CORDLESS BASE BOARD (PCB5) R903 18nH C952 L904 SDIO C813 22nH(1608) K0.1u SDATA L905 C812 C957 OSC_IN 10nH K0.1u Q800 C983 K1000p C958 C984 C960 D10p C990 K1000p C1.5p SCLK C991 D10p C959 C976 R919 K0.1u TX_DATA C956...
  • Page 247 R409 (17) R410 (18) (19) R228 BELL_TX CHARGE CH_CTL R206 S_ENB R207 CBUSY2 CBUSY1 R205 (20) (21) IC201 R223 R220 CCLK R221 R222 R212 (22) R216 R213 (23) BUFFER for serial transmission switching KX-FC379CX : CORDLESS BASE BOARD SCHEMATIC DIAGRAM...

  • Page 248: Handset Board (Pcb6)

    KX-FC379CX 16.6. HANDSET BOARD (PCB6) -16.5dBm OUT CN203 L206 C225 6V22 R232 HEADSET-DET Q206 MIC2 MIC1 L204 TP_ANT L205 -45dBm IN HEADSET-JACK HANDSET SP R226 RSSI TX_DATA R227 OSC_IN R321 (10) (11) RA201 MOD_EN C324 C321 IC206 4.7K -12dBm OUT...
  • Page 249 (50) (51) R268 1K R220 D213 R269 1K R223 270K VBAT VBAT2 Q208 R270 1K L207 IC203 R224 VBAT CHG1 D208 D207 BATTP Q212 D205 D206 3.0V REG CHG2 L208 BATTM Q210 3.0V Q209 VSS2 (52) KX-FC379CX: HANDSET SCHEMATIC DIAGRAM...
  • Page 250 KX-FC379CX...

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