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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.
PRECAUTIONS
To prevent damage of the thermal head caused by static electricity when assembling the chassis ass'y into the unit, the following steps must be followed; 1 : Turn the power switch off. 2 : Discharge the capacitor C18(2200µF) on the PCB L271-1. CN301 3 : Connect the FPC of chassis ass'y into a connector CN301 of PCB L271-2. 4 : Assemble the chassis ass'y. 5 : Turn the power switch on.
PCB L271-2
FPC
C18
LSI1
Chassis ass'y
ADJUSTMENT
Adjustment of low battery detection circuit
PCB L271-1
Figure-4
To adjust the threshold voltage of the low battery detection circuit, the following steps must be followed; 1 : Apply 6.2V + 0.1V / -0V to the battery terminals. 2 : Ground check pads CP45 and CP46. 3 : Adjust a pot VR1 so that the voltage between CP1 and CP2 is 0V ± 10 mV.
Multi-meter PCB-L271-1
+
CP2 CP1
VR1 CP46
BATT
-
CP45
+
6.2V (+0.1 / -0 V) Power supply
BATT +
GND
Figure-5 Setting the thermal head rank Set the thermal head rank with pads RNK1 and RNK2 on the PCB L271-1 according to the following conditions when replacing the chassis ass'y or thermal head. The head rank is indicated on FPC as following figure-6. Head rank A : RNK1=ON, Head rank B : RNK1=OFF, Head rank C : RNK1=ON, Head rank D : RNK1=OFF, RNK2=OFF RNK2=OFF RNK2=ON RNK2=ON
XXXXXXB
Head rank = B
XXXXXXB
Figure-6
�4�
Chassis ass'y
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