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JVC XM-PX50WT Service Manual

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SERVICE MANUAL
PORTABLE MINIDISC PLAYER
XM-PX50WT
Contents
Safety Precautions
MD pick up is exchanged
Description of major ICs
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
UB
1-2
1-3
1-4
1-5
1-11
1-12
1-12
1-13~25
XM-PX50WT
Hong Kong
No.20902
Jan. 2001

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Summary of Contents for JVC XM-PX50WT

  • Page 1: Table Of Contents

    XM-PX50WT SERVICE MANUAL PORTABLE MINIDISC PLAYER XM-PX50WT Area Suffix Hong Kong Contents Safety Precautions Important for laser products Attention when MD pick up is exchanged Disassembly method 1-11 Adjustment method Maintenance of laser pickup 1-12 Replacement of laser pickup 1-12...
  • Page 2 XM-PX50WT 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits.

  • Page 3: Important For Laser Products

    XM-PX50WT Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam.
  • Page 4 XM-PX50WT Attention when MD pickup is exchanged 1. About the static electricity protection measures The laser diode in the traverse unit (optical pick up) is easy to be destroyed by clothes and the human body to the electrified static electricity.

  • Page 5: Attention When

    XM-PX50WT MD door assembly Disassembly method Removing the MD door assembly (See Fig.1 and 2) Shift the door lever to open the door. Remove the four screws A and detach the MD door assembly from the main body. Door lever Fig.1...
  • Page 6 XM-PX50WT Chassis assembly Removing the chassis assembly (See Fig.5 to 7) Side arm (R) Prior to performing the following procedure, remove the MD door assembly and the holder assembly. Open the battery lid. Release the tab d and pull out the battery lid.
  • Page 7 XM-PX50WT Removing the main board and the Battery holder CN401 battery holder (See Fig.8 and 9) Soldering f CN301 Prior to performing the following procedures, remove the MD door assembly, the holder assembly and the chassis assembly. ATTENTION: Before disconnecting the flexible wire...
  • Page 8 XM-PX50WT <Removal of the MD Slit washer Shaft holder mechanism section> Soldering g Worm gear Prior to performing the following procedures, remove the MD door assembly, the holder assembly, the chassis assembly and the main board. Removing the spindle motor (See Fig.11)
  • Page 9 XM-PX50WT Removing the feed motor (See Fig.14) Peel off the adhesive tape j on the flexible wire on Soldering k the underside of the feed motor. Unsolder soldering k connecting the flexible wire to the feed motor. Remove the two screws L attaching the feed motor.
  • Page 10 XM-PX50WT <Charge stand> Removing the charge board (See Fig.1 to 3) Remove the four screws A on the bottom of the body. Remove the top cover upward while pushing the front part a. Pull out the charge board from the bottom cover.

  • Page 11: Adjustment Method

    XM-PX50WT Adjustment method This model is auto adjustment by Remote Controller. Please adjust the attached remote controller. Equipments----- 1. Remote controller 2. DC power supply 3. Laser power meter 4. MO disc (AU-1) 5. Pre master disc (TGYS 1) <Test mode setting method>...

  • Page 12: Maintenance Of Laser Pickup

    XM-PX50WT Maintenance of laser pickup Replacement of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to Turn off the power switch and,disconnect the clean the lens with a alcohol soaked cotton power cord from the ac outlet.
  • Page 13 XM-PX50WT Description of major ICs JCV8002-W (IC601) : Head phone amp 1. Pin layout 2. Block diagram Vref BEEP BEEP Vref Vref IN B BST1 IN A BEEP BST2 OUT B BEEP OUT A CUT A 3. Pin function Symbol...
  • Page 14 XM-PX50WT CXA8059Q (IC450) : Motor driver 1. Pin layout 2. Block diagram 1-14...
  • Page 15 XM-PX50WT 3.Pin function Symbol Function PGND The GND to guard the power stage. The terminal to detect the voltage. The terminal to supply the voltage for the power stage. CPOUT The terminal to connect the capacitor in the final charge pump.
  • Page 16 XM-PX50WT CXD2672GA(IC351):DSP 1.Pin layout AVS1 ASYI DVSS1 LDDR DTRF VSI02 ADFG ADRB AVS2 ADI0 PEAK FILI ABCD CLTV APCR CKRF FOCN ADRT BIAS ASYO XWE TST6 AVD2 AUX1 BOTH FILO XLRF VDI02 DCHG AVD1 MVCI TFDR TRDR DVDD1 FRDR FFDR VDC4...
  • Page 17 XM-PX50WT 2.Pin function(2) Symbol Function Pin No. XLAT Micon serial bus latch input SRDT Micon serial bus data read out output SENS Internal output of micon serial bus address VSC0 Internal logic GND SQSY PTGR=0 ADIPsink output / PTGR=1 DISC SUB-Q sink output...
  • Page 18 XM-PX50WT 2.Pin function (3) Symbol Function Pin No. VSIO1 2.5V I/O sel Vss External DRAM address output ADIO1 2.5V I/O sel VDD U-10 External DRAM address output T-10 External DRAM address output R-10 External DRAM address output U-11 IXOE Open...
  • Page 19 XM-PX50WT 2.Pin function (4) Symbol Function Pin No. E-17 VSIO2 2.5V I/O Vss E-16 F0CN Filter cutoff control output E-15 VDIO2 2.5V I/O VDD D-17 DTRF Controller data output D-16 CKRF Controller clock output D-15 XLRF Controller latch output A-17...
  • Page 20 XM-PX50WT AK93C55BH-W (IC502) : EEPROM 1. Pin layout 2.Pin function Pin name Fnction Chip select Serial data clock Serial data input Serial data output Program enable Ground Power supply Not connected 3. Block diagram DATA REGISTER R/W AMPS AUTO ERASE...
  • Page 21 XM-PX50WT CXA2588R (IC300) : RF amp. 1. Pin layout & block diagram 31 30 36 35 34 33 32 29 28 ADIP Amp TE/SE Amp PEAK 37 24 Vcc FE Amp RF 38 23 3TADJ RFAGC 39 22 EQADJ AGCI 40...
  • Page 22 XM-PX50WT IC-PST3421U-X(IC504):System reset 1.Pin layout 2.Pin function Symbol Function VOUT 1 VOUT Reset signal output terminal Power supply terminal Non connect VSS terminal 3.Block diagram VOUT Vref TK11223BMC-X (IC961) : Regulator 1. Pin layout VOUT CONT NOISE BYPASS 2. Block diagram...
  • Page 23 XM-PX50WT MPC17A139MTB-X (IC400) : 4ch bridge driver 1.Pin layout 2.Pin function Driver section PS,OE INPUT OUTPUT 1~4 X:Don't Care Z:High Impedance Clock detector section OSC circuit Auto Syncro Stop 3.Block diagram Pre-driver Pre-driver Pre-driver Pre-driver Control Control Control Control 1-23...
  • Page 24 XM-PX50WT UPD784225GK-617C(IC501):CPU 1.Pin layout 2.Pin function Function Function Symbol Symbol Non connect ANI5 Non connect ANI6 Non connect Non connect SPSEL Test terminal AVSS Non connect Test terminal DPON Voltage adjust Non connect VADJ Analog reference voltage Test terminal AVREF1...
  • Page 25 XM-PX50WT XC6367A251M-X(IC901):Regulator 1.Pin layout 2.Pin function Symbol Function VOUT Output voltage det. Power supply Chip enable Ext. Tr connect 3.Block diagram Phase VOUT Compensation Error Amp. Comparator Buffer, Driver Ramp Wave Vref with PWM/PFM Generator, Soft Start, Controller 1-25...

  • Page 26: Block Diagram

    XM-PX50WT Block diagram J101 CN601 CN301 CN401...
  • Page 27 XM-PX50WT Standard schematic diagrams Main amp section Standard schematic diagrams C373 Main amp section R376 3.3K R377 R372 100K C376 0.47 R601 470k C614 4.7/4 C613 R603 470k 10/6.3 R604 470k BOTM ABCD C602 1/16 TP307 NTCT AUX1 R345 C603...
  • Page 28 XM-PX50WT XM-PX50WT Charger section KTB772/Y/ SSM3J01F-X QNA0025-001 LV32351-001A 100k 0.01 LV32351-001A 220k 0.068/16 220P BA10324AF-W LV32351-001A BA10324AF-W BA10324AF-W 0.01 BA10324AF-W...
  • Page 29 XM-PX50WT Printed circuit boards Printed circuit boards C406 CN401 S504 C411 C412 Main board (Forward side) Main board (Reverse side) C456 R463 IC400 C457 C452 R459 R465 R460 C453 C300 IC450 C462 Q300 C464 R303 C325 R305 R454 R338 R341...
  • Page 30 XM-PX50WT XM-PX50WT < M E M O >...
  • Page 31 XM-PX50WT PARTS LIST [ XM-PX50WT ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix UB -------------------- Hong Kong - Contents - Exploded view of general assembly and parts list Charger assembly and parts list...

  • Page 32: Exploded View Of General Assembly And Parts List

    XM-PX50WT Exploded view of general assembly and parts list Block No. Main board Jack board...
  • Page 33 XM-PX50WT (General assembly) Parts list Block No. M1MM Item Parts number Parts name Q'ty Description Area ------------ FLM-FPM LV10439-004A BOTTOM CASE LV41969-001A SHIELD SHEET LV32205-001A EJECT ASSY LV41215-006A MINI SCREW 2 FOR EJECT ASSY OPEN KNOB LV32198-001A LV32200-001A SLIDE KNOB...

  • Page 34: Charger Assembly And Parts List

    XM-PX50WT Charger assembly and parts list Block No. Charger board (Charger) Parts list Block No. M2MM Item Parts number Parts name Q'ty Description Area LV20897-005A BOTTOM CASE 1 PC CLEAR LV40243-001A FOOT 2 FOR BOTTOM QYSDSF2006Z SCREW 4 BOTTOM+TOP LV10451-001A...

  • Page 35: Md Mechanism Assembly And Parts List

    XM-PX50WT MD mechanism assembly and parts list Block No. FLM-FPM Grease = FL-7750 = CFD-4007HY2 = FG-87HS = 948P Both side 2.1 0.1mm Parts list (MD mechanism) Block No. M3MM Item Parts number Parts name Q'ty Description Area LV20882-001A CHASSIS ASS'Y...

  • Page 36: Electrical Parts List

    XM-PX50WT Electrical parts list (Main board) Block No. 01 Item Remarks Item Remarks Parts number Parts name Area Parts number Parts name Area C 62 NCB31HK-102X C CAPACITOR C 503 NCB31CK-104X C CAPACITOR C 63 NCB31HK-102X C CAPACITOR C 504...
  • Page 37 XM-PX50WT Electrical parts list (Main board) Block No. 01 Item Remarks Item Remarks Parts number Parts name Area Parts number Parts name Area Q 502 DTA143TE-X TRANSISTOR R 373 NRSA6AJ-684W MG RESISTOR R 376 NRSA6AJ-332W MG RESISTOR Q 901 FMMT617-X...
  • Page 38 XM-PX50WT Electrical parts list (Jack board) Block No. 02 Item Remarks Parts number Parts name Area J 101 QNS0098-002 3.5 JACK (Charger board) Block No. 03 Electrical parts list Item Remarks Parts number Parts name Area QETN1CM-227Z E CAPACITOR 220MF 20% 16V...

  • Page 39: Packing Materials And Accessories Parts List

    XM-PX50WT Packing materials and accessories parts list Block No. Block No. (Packing) Parts list Block No. M4MM Item Description Parts number Parts name Q'ty Area POLY BAG 1 FOR SET LV30245-003A LV32550-002A PACKING CASE QPA01202505 POLY BAG 1 FOR CHARGER...

  • Page 40: Xm-Px50Wt

    XM-PX50WT VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.20901) 200101(O)

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