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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.
BLOCK DIAGRAM
1 A/V Jack Chroma Circuit Volume Control 4 IC400 Tuning Voltage Generator Common Driver IC300 2 VR600 Audio Amp. IC600 Speaker
LCD
3
IC700 OSC Display Control A/D Converter Auto-tuning Control
Segment Driver
VR800
5
Q800~Q801 Display Voltage Generator
Power Supply
VCC2 (4.0V) VCC6 (28 ~ 40V) VCC7 (48 ~ 72V) VEE1 (-8.4 ~ -5.6V)
Brightness Control
1 2 3
� Chroma Circuit IC300 M51286FP Generates the tricolor of red, green and blue from the video signal. � Audio Amp. IC600 TA7368F Sound amplification � OSC, A/D Converter, Display / Auto-tuning Control : IC700 MSM6525B02 GSK-64D Converts the color signal into digital signal. Also generates the clock pulse for the display, and controls the display. � Tuning Voltage Generator IC400 MSC1169MS-K Generates the tuning voltage from the tuning pulse (TU) output of 6. � Display Voltage Generator Q800 ~ 801 2SD1149, 2SD601A-Rxz Generates the display voltages V0 ~ V4 from VEE1 and VCC7 outputs of the power supply.
4 5
�2�
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