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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.
14VT-L100T
ELECTRICAL TROUBLESHOOTING
VCR POWER TROUBLESHOOTING The VCR is dead.(No power) FLOW CHART NO.1-1 KEY-IN TROUBLESHOOTING Key-in input for VCR is not received. FLOW CHART NO.1-2
Unplug the AC power cord. Replug it a few minutes later. YES Are the AT 5V and AT 12V NO lines normal? YES Are the AT 5V and GND lines properly connected with IC7701? YES Is there oscillation (16MHz) at pins (38) and (39) of IC7701? YES NO Check/replace X7701 and/or IC7701. NO Check power circuit.
Is the key switch in good contact? YES Is there short-circuit in the key input? YES Check poor soldering. Are signals received at pin (27) of IC2001 when the key is activated? YES Check IC7701, IC2001 and signal line of serial datas, serial clock and ready (L).
NO
TROUBLESHOOTING OF VCR SECTION
Check the switch contact.
NO
Check IC2001 and switches for poor soldering.
NO
Check key lines to input IC2001.
40
Does the "L" pulse of syscon reset appear at pin (43) of IC7701 after the AC cord is plugged in? YES Does pin (21) of IC7701 change from "L" to "H" level when the power button is pressed to turn on the power? YES Are the PC 9V and PC 5V lines normal? YES Check the sensor inputs to IC7701 from mechanism. (CAM switches,start/end sensors,and reel sensors)
NO
Check the signal line of sys-con reset all the way up to pin (22) of IC2001.
NO
Check the power key input to IC2001 and serial datas/clocks between IC2001 and IC7701.
NO
Check power circuit.
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