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Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this tuner.
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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.
4.4.5 Optimization adjustment of Front End parameter Adjustment to optimize Front End parameter must be performed in each mechanism assembly of this model for high-speed starting.Please perform optimization according to the following procedures just after all-initialization is completed and when FL display shows anything except "�0" (For example when FDP shows "�1", "�2", and "�3") at test mode. (1) Press "POWER" button of the front panel to turn the main body on (not to set the main body at test mode). (2) Insert the test disc VT-501 or commercial dual-layer DVD software. (3) Remove the disc when the FL display changes from "READ" to disc information. (4) Perform the same procedures as in (2) and (3) above by using the test disc CTS-1000 or commercial CD-DA software. (5) Set the main body at test mode, and check that the FDP shows "�0". NOTE: Status of this adjustment can be judged by the number displayed at test mode as follows: DVD adjustment Adjusted Not adjusted Adjusted Not adjusted CD adjustment Adjusted Adjusted Not adjusted Not adjusted FDP at test mode �0 �1 �2 �3
NOTE: As for a disc used for adjustment, � Disc should be mounted. ("Mounting" means to display "READ" after the disc is inserted and then display the disc information.) Disc need not be played. � If you do not have test disc either VT-501 (DVD) or CTS-1000 (CD-DA), use a commercial disc (for DVD, dual-layer software) after seeing and checking that the disc is neither curved nor foreseen that it may shake at the time of playback.If you use a disc with bad features, starting time may be slow or disc may not be read. 4.4.6 (1) (2) (3) Display of current value of laser Set the main body at test mode. Press "SET UP MENU" key of the remote controller three times. Then, FDP is displayed "CHECK". The laser current value can be switched between the value of CD and that of DVD by pressing the following key of the remote controller.
FDP (Example)
2530
****
Remote controller "4" key --- Laser of CD Remote controller "5" key --- Laser of DVD
The number shown in the FDP shows mA of current value of laser.The first two numbers ("25" in "2530") shows current value of laser at the time of adjustment after the latest all-initialization, 25mA in this example.The last two numbers ("30" in "2530") shows the present current value of laser, 30mA in this example.The first two numbers ("25" in "2530") usually shows current value of laser at the time of shipment, so you can see how the product has been deteriorated by comparing the first two numbers ("25" in "2530") and the last two numbers ("30" in "2530"). CD: The laser current value of 65 mA or less is normal.The laser current value of over 66 mA is not normal. Laser diode of the pickup has been deteriorated. DVD: The laser current value of 80 mA or less is normal.The laser current value of over 81 mA is not normal. Laser diode of the pickup has been deteriorated. To return to test mode, press "STOP" button of the front panel.
1-22 (No.YD001)
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