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Parts marked with "8" is important for maintaining the safety of the set.
ones for maintaining the safety and performance of the set.
CONTENTS
CHAPTER 5. CIRCUIT DESCRIPTION
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
Service Tools . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Be sure to
foraftersalesserviceonly.
replace these parts with specified
This document has been published to be used
The contents are subject to change without notice.

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Summary of Contents for Sharp FO-3700

  • Page 1: Table Of Contents

    CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 5. CIRCUIT DESCRIPTION circuit description ..... 5-l 1 CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS CHAPTER 2.
  • Page 2: Chapter 1. General Description

    9600 bps with automatic fallback to Height 212 mm Approx. (without attachments) 6.9 kg Approx. 15 seconds (Sharp spsclal mode) Sharp special mode, excluding time for protocol signals (i.e., ITU- 203 mm (average) TS phase C time only). Automatic feeding: Width - 148to216mm...
  • Page 3: A Look At The Machine

    Adjustable document guide Handset When transmittfng or copying Use the handset for ordinary a document, set these guides telephone conversations or to to the width of the document. listen for fax connection tones. document tray Original document In tray Operation panel Original document out tray Operation panel knob Paper tray...
  • Page 4: Operation Panel

    Document rollers These move the document through the machine during scanning. Document rollers Ink cartridge This scans the document for transmission and copying. MEMORY key Liquid crystal display Use this key to store a Displays various messages during scanned document in operation and programming.
  • Page 5: Transmittable Documents

    5. Automatic Document Feeder Capacity Number of pages that can be placed into the feeder at anytime is as follows: 1. Document Sizes Normal size: max. 20 sheets (52 - 74.3 g/m2) width Special size: single sheet only (manual feed) Normal size 1 2 8 - 2 7 9 m m length...
  • Page 6: Installation

    7. Use of Document Carrier Sheet A document carder sheet must be used for the following documents. Those with tears. Those smaller than size 148 mm (W) x 128 mm (L). Carbon-backed documents Ensure document is Place the document carrier in the document feeder with the clear film side down Direction of insertion...
  • Page 7 2. Unpacking Take the machine out of the box carefully, remove all packing material. Make sure you have all the items listed below. 3. Installing the print cartridge cartridge. right side of the machine Be careful not to touch the copper ribbon or the ink nozzles, forward, and open the operation panel.
  • Page 8 the cartddge into place. Slide the tray in as shown until it clicks into place. Place the original document out tray on the paper tray. Slide it in or out to fit the length of the original. Insert the small modular plug which terminates the FOBOTP adap- 4.
  • Page 9 Selecting paper Make sure it fits squarely against the inside of the machine. The inkjet printer in your FO-3700 is designed to work well with most types of plain paper. Bond paper generally produces the best results, and plain paper manufactured for high-quality photocopying is also good.
  • Page 10: Quick Reference Guide

    Use this guide as a convenient reminder for operating the machine after you have read the Operations using the FUNCTION key detailed instructions for each procedure in the manual. The following chart shows how access key operations. Once you have accessed $ r - - - - - - - - - - - Y the desired operation, follow the instructions which appear in the display.
  • Page 11: Chapter 2. Adjustments

    If Fl is open, replace it with a new one. In addition to the replacement of Fl, the factor causing Fl to open must also be repaired. If not, Fl will open again. - 1 2 v Replacement parts ICP-N20 (Sharp code: VHVICPNZOI1) Fig. 1...
  • Page 12: Diagnostics And Service Soft Switches

    The result of the machine check is given by a number of beeps, and the total result is given by printing the ‘ROM & RAM CHECK TABLE’ list. 1. Diagnostics description number of beeps (1) Entering the diagnostic mode Press the keys in the following sequence )m]+a-+a+@ Then press the ‘START/COPY’...
  • Page 13 07 CHECK PATTERN 10 MEMORY CLEAR Used to check the nozzles of the print head. The following pat- Used to clear the memory. The soft switches and the user tern is printed out on the sheet, A total of two sheets will be switches will be set to initial states.
  • Page 14 2. Soft switch description Soft switch list Switch setting and function D e f a u l t Note Item FINE USER Line density choice fax automatic switching switching to fax only registration 4 Total communication hours and pages print Reserved Reserved transmitted...
  • Page 15 (Binary) No. =5 6 (Bit No.) Mode signal transmission level ON (OVER -16dBm) r of Busy tone detection SWITCH Reduce of copy and manual No.5 No.6 receive footer off 92 % 100% USER SWITCH footer on 91 % 100% Reduce of auto receive...
  • Page 16 DTMF detection time 8 4 2 1 (Binary) on number of times 2 - 6...
  • Page 17 64 32 16 8 (Binary) No. = 1 2 4 (Bit No.) 1 (Binary) N o . = 5 8 7 Soft switch setup Soft swftch settings stored in memory can be changed by entering Make settings in the same way as for SW2. Proceed to the settings of data from the keyboard.
  • Page 18 No.4 Activity print When set to ‘l’, the date of reception, the sender’s machine No., and This soft switch is used to select; whether or not to print out the the page Noare automatically recorded at the end of reception. activity report when the memory is full.
  • Page 19 Used for detection of CNG in one or two pulses in the TEL/FAX automatic switching mode 0: Once 1: Twice Default: 1 Set to ‘0’. Choice is made for the format of time display 0: 12 hours mode (AM/PM) . V27ter 489OBPS 1: 24hoursmode Default: 1 Used to set entry of date into activity report and LED format accord-...
  • Page 20 Duplicate last row Smoothing Constant line density using duplication 0 x 0 3 Constant line density using smoothing 0 x 04 0000: Does not change 0001: 1 times When the machine is set in the auto receive mode, the number of rings before is made can-e selected.
  • Page 21: Trouble Shooting

    Apply line equalization SOFT SWITCH 2-5 Can be used in all cases. Refer to the following actions to troubleshoot any of problems men- Slow down the transmission speed SOFT SWITCH 14-5 6 7 8 tioned in l-6. Can be used in case [2] [3] A communication error evoked.
  • Page 22: Error Code Table

    Transmission errors Able to recognize handshake signal, but it has errors. Cannot recognize the handshake signal from the receiver side. Line disconnected during transmission. Line disconnected after modem speed fall-back. tine disconnected during multi-page transmission. Cannot recognize the handshake signal for next page at receiver side. No response from receiver side or ‘disconnect sional’...
  • Page 23: Chapter 3. Mechanism Blocks

    The hopper is used to align documents with the document guides adjusted to the paper width. NOTE: Adjust the document guides before and after inserting the document. 3-2. Automatic document feed 1. Document feed block and diagram 1) Use of the paper feed roller and separation rubber plate ensures error-free transport and separation of documents.
  • Page 24 5. Optical system Paper feed spring Separation rubber plate Last page of document (1) General view Paper feed Back of document \ LED Lamp G-&Glass Transmission roller /.’ Paper feed roller Lens CCD PWB Fig. 4 Mirror 1 3-5. Documents requiring use of document carrier Fig.
  • Page 25 This chapter mainly describes the disassembly procedures. For the assembly procedures, reverse the disassembly procedures. Easy and simple disassembly/assembly procedures of some parts and units are omitted. For disassembly and assembly of such parts and tinits, refer to the Parts List. The numbers in the illustration, the parts list and the flowchart in a same section are common to each other.
  • Page 26: Square Hole

    Parts list (Fig. 2) Original guide lower, paper feed roller, sensor lever ass’y, etc. Part name I Q’ty Medium cabinet Screw (3 x 8) original sensor lever a&y, and the front sensor lever ass’y. Original guide lower ass’y Paper feed roller a&y careful not to damage the front sensor lever.
  • Page 27: Fig. 3

    Parts list (Fig. 3) . Remove the original guide lower ass’y, and the paper feed roller optical unit. 9 ) Mirrorholdingspring 1 2 1 when replacing. If they are disassembled, the optical unit adjustment must be performed. Scanning glass disassembly (Left side) Disengage both edges of the glass from the rib as shown in...
  • Page 28: Part Name I Q'tv

    Parts list (Fig. 4) Drive system unit Part name power unit) according to procedure l-a, and remove the cable from the cord keep. <Note 2> Remove two pawls and one rib. (Refer to the en- larged view.) Lock the paw1 in the groove in the shaft. ’ medium cabinet i Insert the medium cabinet rib into the lower cabinet...
  • Page 29 Parts list (Fig. 5) Upper cabinet section (Panel, hopper, etc.) a. Remove the scanner section from the lower cabinet according to procedures 4-a, b. b. Remove the upper cabinet section from the upper frame section, and remove the panel PWB, keys, and hoppers. Pass the panel Dischame \ cable between...
  • Page 30: Screw (3 X 6)

    Parts list (Fig. 6) Upper frame section (original guide Q’ty 1 No. 1 upper section) 12 Open/close spring 2 13 Transport roller ass’y 14 Screw (3 x 6) ding cable procedures 4-a, b. according to procedure 5-b. 7 1 Separation pressure sp roller, and the transport roller from me upper frame section.
  • Page 31: Screw

    Parts list (Pig. 7) Ink jetter unit jetter section from the body. procedures 4-1, b. cabinet, be careful not to hang the cables and connec- tors. Put the cable to the PWB side and Fix with tape. 325 f 5 mm Square hole Wind the cable around the core two turns.
  • Page 35 Control PWB/Operation panel I 1 I I 12 I CNDR is mounted only in the FCM700 (JST) B7B-PI-I-K-S...
  • Page 37: [L] Circuit Description

    3. Operational description Operational descriptions are given below: Transmission When a document in loaded in the standby mode, the state of the document sensor is sensed via the gate array A. If the sensor signal was on, the motor is started to bring the document into the 1.
  • Page 38: Control Pwb Description

    1. General description Fig. 2 shows the functional blocks of the control PWB, which is com- posed of 6 blocks. Fig. 2 Control PWB functional block diagram 2. Description of each block (1) Main control block The main control block is composed of an 8-bit microprocessor H D 6 4 1 8 0 , R O M (256KByte), SRAM (32KByte), a n d D R A M (640KByte).
  • Page 39 HD64180 (IC4) terminal descriptions clock input pin. The external clock input frequency must be two e address to make access to the memory space. HIGH only in the following cases: Enable: Shows that l/O read/write operation is being executed. LOW in the following cases: (a) Read/write of data in executing an I10 command (b) I/O access in DMA cycle (c) mc acknowledge cycle...
  • Page 40 Clasaificatlon Code Terminal No. Name and pin function System control HALT HALT: LOW when the CPU executes HALT or SLP command, output signal and shows to the outside that the CPU is in HALT mode, SLEEP mode, or SYSTEM STOP mode. Used with ST signal and m signal to show the operation status such as the internal DMA operation and the CPU operation mode.
  • Page 41 HD64180 (IC4) Classification Code Terminal No. Name and pin function DMA signal Transfer End for channel 1: Internal DMAC trasnfer (to output channel 1) end signal.Ddven LOW in synchronization with the last data transfer write cycle. Serial I/O signal output Transfer Data for Asynchronous SCI Channel 0: ASCI channel (ASCI channel 0) 0 transfer data terminal.
  • Page 42 Name Description PI697 Input mode Input port (I/O address 6BH) CPU address bus I/O address AOH - BFH selection I/O address 80H - 9FH selection Input mode: Input port (I/O address 6BH) Output mode: I/O address 70H - 7Fl-l selection PO660 PO661 PO662...
  • Page 43 8) E95G38 (El2 gate array B) . . . 100 pin QFP The following functions are provided as the main CPU peripheral functions. Memory mapper WAIT control Main CPU timers (3 units) DRAM controller Panel I/F (LCD controller I/F, key scan) Modem I/F (RTC detection) Alarm buzzer/busy tone clock frequency division Description...
  • Page 44 (2) Panel control block The following controls are performed through LZ95G38 according to commands from the main CPU. Operation panel key scanning Operation panel LCD display (3) Peripheral l/O control block Recording control block diagram block > Prfnter unit (84180) Fig.
  • Page 45 The modem can operate at 9600,7200,4800,2400, or 300 bps, and (4) Image signal processing block also includes the V.27 ter short training sequence option. The image signal processing block is composed of the following: The modem can also perform HDLC framing according to T.30 at or300 bps.
  • Page 46 Pin No. Signal Name Pin No. Signal Name GPO3 GPO4 GP13 GPO5 GPO6 GPO7 OVD2 EN85 OVD2 YCLK OVD2 GP16 GP17 OVD2 OVD2 DCLK EYECLKX EYECLK EYEX DAOUT OVD2 EYEY GP21 OVD2 GP20 BYPASS OVD2 RCVO GPO2 Notes: 1. NC = No connection; leave pin disconnected (open). TXOUT Analog signals: see Table 10.
  • Page 47: Description Of Ccd Board

    (2) Description of blocks The CCD board picks up optical information from the document, con- 1. CCD it into an electrical (analog) signal and transfers it to the control The TCD1206D is a highly sensitive charged coupled image sensor board. that consists of 2160 picture elements.
  • Page 48 (12) Dial control block This is composed of IC3 and its peripheral circuits. Signal from the This is composed of lC9 and its peripheral circuits. selection signal according to Chit signal from the CPU is outputted to The signal is inputted to amplifier IC through volume and amplified the pulse transmission block DP and the telephone line block (PB) and sent to the speaker.
  • Page 49 Speech Network IC Pin No. Pin Name Pin function [Line current input pin] This pin is connected to the positive output of the diode bridge circuit. [Send output current flowing pin] This oin is connected throuoh the 56 Ohm resistor to the V oin (;i).
  • Page 50: Description Of Power Supply

    3.2. Control section A voltage is generated in the secondary side by repeated opera- 1. Block diagram tions of 3.1, and the output in the secondary side is divided by adjusted to about 6.2V by VRl . Q4 always monitors the divided output voltage.
  • Page 51 3.6 Rush current limiting circuit 3.7. Line filter When AC power is supplied, a rush current flowing through capacitor To protect against external noises and noises generated in the power C5 may blow fuse Fl/F2 and damage the circuit. To prevent this, the circuit, the line filter is composed of Ll, L2, Cl, C2, C3, and C4 to power thermistor THl is provided to limit the rush current.
  • Page 52 Main control block...
  • Page 53: [L] Control Circuit/Pwb

    Image memory control...
  • Page 55 Scanning section...
  • Page 56 Peripheral l/O control section...
  • Page 59 <ON HOOK STATE>...
  • Page 61 6-10...
  • Page 65 6-14...
  • Page 66: Power Supply Circuit/Pwb

    NOTE:...
  • Page 68 6-17...
  • Page 70 6-19...
  • Page 71 I lllll E - M M...
  • Page 74 PRINT HEAD DRIVE PAPER MOTOR DRIVE PEN IN DETECT...
  • Page 75 FO-3700A --c'...
  • Page 77: Chapter 7. Operation Flowchart

    FO-3700A CY-~' FLOW-VE-1 7 - l...
  • Page 78 FO-3700A FLOW-VE-2 Turn on exposure LED 7 - 2...
  • Page 79 FO-3700A .:a* FLOW-VE3 Send (NSF) (CSl)-OS 2times Set T2 Send MCF Send TRN Send RTP...
  • Page 80 FO-3700A FLOW-VE-4 Reset T2...
  • Page 81 FO-3700A Transmitter side Receiver side G3 communication (Document inserted into document sensor during stand by) To recording ..--..-.. position the reading position 1 st page E O P 1 E O P 7 - 5...
  • Page 82 FO-3700A Auto dial sending TEL mode Dial send Stand-by CML relay ON 7 - 6...
  • Page 83: Power On Sequence

    FO-3700A m-z-- Power SW ON Printer initialize Standby Backup RAM clear Backup RAM clear...
  • Page 84: Chapter 8. Ohters

    FO-3700A List PRICE PARTS CODE DESCRIPTION RANK Extension board unit 2. Description 1) Remove the bottom ass’y from the body. 2) Connect the cables from the body with the extension PWB unit connectors (CNCCDl, CNSNSl, CNTXMl, CNPNLl, CNPI 1, PWB and the TEULIU PWB unit. Fix the grounding cable to the (Note) When connecting the cables, check the color of the cables and the color of the connectors.
  • Page 85 NO. 1 PARTS CODE DESCRIPTION PRICE DESCRIPTION PARTS CODE RANK ..Pen garage Torx screwdriver (M2.5 x 5) Torx screwdriver (M3 x 8) Optical adjustment plate 2-2. Scan optical system adjustment lighting mode Loosen the two red screws of the CCD to obtain VID signal waveform in synchronization with eT signal and adjust The adjustment procedures of the scan optical system are described the CCD position so that the following waveform is obtained.
  • Page 86: Ic Signal Name

    FO-3700A Equivalent circuit (One of the four blocks) Pin Arrangement SIG C SIG D CONT CONT OUT/ OUT/ APPLICATION CIRCUIT PERFORMANCE Characteristic Units Typical Value MC3401 2-l Warble Frequency Output Voltage VP-P Output Duty Cycle V n s Ringing Start Input Voltage (20Hz) Ringing Stop Input Voltage (20Hz) Maximum AC Input Voltage (<68Hz) Impedance When Ringing...
  • Page 87 FO-3700A ~=-.+' 2. A-INPUT 3. A+INPUT 4. v- 5. &INPUT 6. B-INPUT 7. B OUTPUT 8. V+ 2M EP-ROM (TOP VIEW) a vo2 CD 1 A l 6 v c c A l 5 5 VOl A l 2 7 R F AC2 f Data output RO 4...
  • Page 88 FO-3700A HALT VCC OUT1 IN1 I N 2 our2 v c c TEND1 v s s RTSO A l l (TOP VIEW) 1. A OUTPUT A-INPUT INPUTS B-INPUT OUTPUT B OUTPUT 2. A-INPUT 3. A+INPUT 4. v- 6. B-INPUT 7. B OUTPUT...
  • Page 89 FO-3700A 28 VCC A l l N.C. Non connection (TOP VIRN) (TOP VIEW) 8 - 6...
  • Page 90 FO-3700A Pin descrption Address input AO-A9 (Low/Refresh AO-A3 Column AO-A31 Low address strobe Connection Block diagram 8 - 7...
  • Page 91 FO-3700A __... NC: Not connected...
  • Page 93: Parts Guide

    P A R T S G U I D E Because parts marked with “A” is indispensable for the machine safety maintenance and operation, it must be replaced with the parts specific to the product specification.
  • Page 94 FO-3700A 2 3 ’ ‘ 2 3...
  • Page 95 FO-3700A Document guide lower Paper feed roller Paper feed gear 542 Pinch roller shaft 2 1 3 8 X H Z Z spring 2 6 7 7 S C Z Z [Driving plate gear 2 6 8 4 S C Z Z plate...
  • Page 96 FO-3700A ‘ 7...
  • Page 99 FO-3700A - - *’...
  • Page 100 FO-3700A P R I C E N E W P A R T PARTS CODE D E S C R I P T I O N RANK MARK RANK Vinyl cover Face sheet Protector Side pat R 5 S P A K A Side pat L Hand set cord Vinyl bag for AC cord (140x3601~~1)
  • Page 101 FO-3700A Capacitor (50WV 22OPF) 5 8 V C C C T V Capacitor (5OWV 220PF) 5 9 V C K Y T V IV 22OOpF) 6 0 V C K Y T V 6 1 V C K Y T V Capacitor (5OWV 22OOpF 6 2 V C K Y T V I r?.n.ritn.
  • Page 102 FO-3700A PARTS CODE RANK MARK RANK 1 2 1 1 2 2 1 2 3 IC (27021 150 V R S - T S V R S - T S , ..--. L._. 152 VRS-TS2AD271J 1 5 3 166 VRS-TS2AD330J 1 6 7 V R S - T S - /Resistor ( 185 1 V...
  • Page 103 FO-3700A PARTS CODE PRICE PART [Resistor (l/lOW l( Reslstor (l/lOW 47.5KD ‘1%) Resistor (l/lOW IOKD *50/d Resistor (l/lOW 1On 25%) Resistor (l/lOW 1On *5x) Resistor (l/lOW 1On 25%) Resistor (l/low IOn 25%) Resistor (l/lOW 17.4Kn rtl?” Resistor (l/10Wm86.6Kn C IResIstor Reslstor (l/lOW 1OKn 25%) Resistor (l/lOW 1OKn 25%) Resistor (l/lOW 1OKn 25%)
  • Page 104 FO-3700A PRICE PART D E S C R I P T I O N I Resistor (l/low On k5%) I E IResistor CR2451 I Pmrr+-l II CLILI-\ Shading label (for EP-ROM) Control PWB unit P R I C E N E W P A R T PARTS CODE D E S C R I P T I O N RANK MARK RANK...
  • Page 105 FO-3700A Switch (SJ-W2R4A-3088 Heat sink (D2157-50018 6 7 O C B L R S O Supporter (SUP- 103 SUS) Supporter (SUP- 101 SUS) 6 8 O C B L R S O , ..““I”L1U.I cap \-?a I Radiation sheet (30T-55-24-A) Ca acitor 50WV d AA AA 1 50WV 2 q,,F\...
  • Page 106 FO-3700A Resistor (l/lOW 510Kn 25% Resistor (l/lOW 200Kn +5k Resistor (l/lOW 1OKn 25%) Resistor (l/lOW 1.C Resistor l/lOW lO~n&r ~37~ Resistor (l/lOW 750R t50 Resistor (l/lOW 33 Resistor (l/lOW Resistor (l/lOW 1OOKn -t5% C ICapacitor ( 5 O W V 10 241 V I r?lnm-it””...
  • Page 107 FO-3700A I.“. D E S C R I P T I O N 3900PF) cc1311 CC1321 c c 1 3 3 1 Capacitor (5OWV 0.022rF) Capacitor (50WV 0.022pF) Capacitor (50WV 820PF) . ..^ .-^.. 4700PF) 0 2 9 S C O 0 Connector ,vpssa, Connector (2pin) Connector (50pin)
  • Page 108 FO-3700A C IResistor I D...c.i.-ln. II ,,n\*t P R I C E N E W P A R T PARTS CODE RANK MARK RANK Capacitor (25WV O.lrF) Capacitor (5OWv22OOPF) Resistor (1/8W 5.6Kn t50/& 5 V~ ‘RS-TP2BD562J Resistor (1/8W 5.6Kn &5%)
  • Page 109 FO-3700A P R I C E N E W P A R T PARTS CODE D E S C R I P T I O N RANK MARK RANK Resistor (1/8W On 25%) 9 VRS-TPL 12 P G U M M 2 1 13 VVLLF71 51 V H EG43)
  • Page 110 FO-3700A...
  • Page 111 FO-3700A P R I C E NI E W P A R T PARTS C ODE RANK , ,>r.,,,. , . ..ARK i-23 l - 1 0 I AU I , “0 L X - B Z 2 1 7 8 S C Z Z L X - B Z 2 1 8 2 S C Z Z , .
  • Page 112 FO-3700A 6-290 a - 30; I LO I , AD I k I A,,,...
  • Page 113 FO-3700A P R I C E N E W P A R T P R I C E N E W P A R T PARTS CODE PARTS CODE R A N K M A R K R A N K R A N K M A R K R A N K a- 385 I c I...
  • Page 114 FO-3700A P R I C E N E W P A R T PARTS CODE R A N K M A R K R A N K a- 53 , o- 53,...
  • Page 115 FO-3700A P R I C E N E W P A R T PARTS CODE R A N K M A R K R A N K 176 ’ * A ’ a- 329 I a- 333 I ii I c I a-337 I c I I P..
  • Page 116 FO-3700A P R I C E N E W P A R T P R I C E N E W P A R T PARTS CODE PARTS CODE R A N K M A R K R A N K I *IA I I AC I , tll- ,...
  • Page 117 FO-3700A ADVARSEL ! (Danish) Udskiftning mB kun ske med batten af samme fabrikat og type. Lever det brugte batten tilbage til ieverandoren. Caution ! (English) Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the equipment manufacturer.
  • Page 118 FO-3700A S H A R P COPYRIGHT 0 1994 BY SHARP CORPORATION All rights reserved. Printed in Japan. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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