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I have this hi-fi system for a long time and I need to repair some things. Founding this manual will be very helpfull :)
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It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
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Very fast service, best quality of the service manual and the schematics
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This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.
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Hi, this is a very clear manual, nice copy, not quite up to the standard of the very best available but better than many others. I think the price was especially fair for a hard to find manual and I would certainly use this manual seller again. Recommended.
5
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8
No.
4
Symptoms
A tray cannot be opened. (An opening screen is displayed on the monitor)
Diagnosis Contents
Does the voltage of CP2302-pin 3 and pin 1 on the DVD MT Assy change normally ? Pin 5 (SW2(TRIN)): Tray is fully closed: "L" Pin 3 (SW1(TROUT)): Tray is fully opened: "L" Is a LOAD-DRV signal reaching ?
Possible Defective Points
Tray SW
A
DVD MT PCB Assy DVD IC (IC4002)
Are the signals output from IC2301-pin 5 and pin 6 (CP2302-pin 4 and pin 5) on the DVDM Assy ? DVD MT PCB Assy Pin 5: Approx. 45V during opening tray approx. 0V during closing tray. FTS Driver IC (IC2301) Pin 4: Approx. 0V during opening tray approx. 4.5V during closing tray. Are wires of CP2302 and CP2303 on the DVDM Assy disconnected or Connector / cable damaged ? Does the voltage of CP2303-pin 5 change by pressing the Inside switch. 5 Playback impossible (no focusing) Are the signals output from IC2301-pin 9 (F+) and pin 8 (F�) on the DVDM Assy ? Does 650-nm LD emit light ? Does a pickup lens move up / down ? Does an actuator spring bend ? Are plastic parts damaged ? Or is a shaft detached ? Is the turntable detached or tilted ? Is flexible cable of CP2301 on the DVD MT Assy disconnected or damaged ? Is signal output from IC4002-pin 42 (FOSO) on the DVDM Assy ? (Device control of about 1.4 V is output usually. It is fluctuated by about ± 250 mV with focus up / down.) 6 Playback impossible (Spindle does not turn) Are the signals output from IC2301-pin 13 (MOT SPDL�), and pin 14 (MOT SPDL+) on the DVD MT Assy ? Is pin 41, 42 (STBY) fixed LOW? Is there any part detached from the spindle motor ? Or Is there any foreign object lodged in it ? Are wires of CP2303 on the DVD MT Assy disconnected or damaged ? Is signal output from IC4002-pin 37 (DMSO) on the DVDM Assy ? 7 Playback impossible (Playback stops) Does 650-nm LD deteriorate ? If the voltage at each both ends of R2303 and R2305 on the DVD MT Assy is 0.4 V or more, the 650-nm LD is definitely deteriorated. Does 780-nm LD deteriorate ? If the voltage at each both ends of R2302 and R2304 on the DVD MT Assy is 0.4 V or more, the 780-nm LD is definitely deteriorated. Are there scratches or dirt on the disc ? 8 Picture disturbance during playback (block noise, freeze, other) No sound (Picture is normal) Are there scratches or dirt on the disc ? Is there a problem with the format of the disc ? Inside switch DVD MT PCB Assy FTS Driver IC (IC2301) Pickup Mechanism section (motor) Flexible cable / connector DVD MT PCB Assy DVD IC (IC4002) DVD MT PCB Assy FTS Driver IC (IC2301) Mechanism section (Spindle motor) Flexible cable / connector DVD MT PCB Assy DVD IC (IC4002) 650-nm LD deteriorated. (When playback of a DVD is impossible) 780-nm LD deteriorated. (When playback of a CD is impossible) Disc Disc
C B
D
9
Is signal output from IC4001-pin184 and pin 186 on the DVD MT Assy DVD MT PCB Assy ? DVD IC (IC4001)
E
F
DV-393-S
5 6 7 8
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