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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.
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This schema available for me in good condition. I would highly recommend.
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Thanks for this "hard to find" service manual.
I apreciate the good quality of scanning and the pages scanned in A3 format.
CD TEST MODE
1-1 How to Activate CD Test Mode 1) Connect 62 pin (test) of IC701 (LC72358N-9910) on MAIN C.B to the 31 pin (VDD) by cable. Caution when servicing (1) How to use extension jig. Correct between MAIN C.B. and CD mechanisms by extension jigs when checking CD mechanism (TN-CCD1001-113J) operation. (Refer to the following figure.)
2) Connect wire of ACC (red) and BACKUP (yellow) of power supply/speaker connector to DC+12V, then connect Ground (black) to -. When CD test mode is started, all displays will be lighted as shown in the following figure.
1-2 How to cancel CD Test Mode 1) Disconnect the cable of 62 pin (test) and 31 pin (VDD) of the MAIN C.B IC701 (LC72358N-9910) and switch on the power. 1-3 CD Test Mode Functions MODE Keys to operate Start Mode Search Mode RANDOM Display All lightented TOC READING Operations � Continual Focus Search (The pickup lens respeats the full-swing up-down motion) * NOTE 1 � Normal Play Back � Focus search is contiuned if TOC cannot be read � Pause Status Contents � Start TEST MODE � Confirm APC circuit � Laser current measurement � Confirm focus error waveform � Focus servo � Traking servo � CLV servo � Sled servo � Traking servo OFF Parts Description AKC-JIG Parts Number SV-J00-075-010
Play Mode
REP 1
Traverse INT Mode Thread Mode
TRACK No. Playing Time Indication Revel/Ing Indication Track no. & Playing Time Indication All lightened
� Pick up Move to outer most track � Thread servo � Pick up Move to inner most track � Confirm mechanism operation
Gain Switch
1 (Preset Button)
All lightened
� Step 1 : For CD/CD-R � Step 2 : For CD-R RF Gain is up against Step 1 � Step 3 : For CD-R Laser Power Up against Step 2
� Step 1 to 3 are cyclic � �Error 03� is indicated if the Disc does not Step 1 match.
� Do not insert a Disc when confirming Search Mode � Press PWR button when cancelling Search Mode. Test Mode will be restored when PWR button is pressed once again. � Insert the �Test Disc� when operating all modes except search mode. * NOTE 1 : There are CD operations are disable owing to the protection circuit being operated when heat builds up in the driver IC if the focus search is operated continually for more than 10 minutes. In cases, the power supply should be switched off for 10 minutes until heat has been reduced and then re-started.
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