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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.
Testing Performance To test the voltage measurement accuracy (oscilloscope)
Acquire the data
Use the following table for steps 1 through 5. Oscilloscope Settings
V/Div 4 V/Div 1 V/Div 400 mV/Div 40 mV/Div 40 mV/Div 400 mV/Div 1 V/Div 4 V/Div Offset -7.0 V -1.75 V -700.0 mV -70.0 mV 70.0 mV 700.0 mV 1.75 V 7.0 V Supply -14.0 V -3.50 V -1.40 V -140.0 mV 140.0 mV 1.40 V 3.50 V 14.0 V
Voltage Readings
Upper Limit -13.7 V -3.43 V -1.37 V -137.0 mV 143.0 mV 1.43 V 3.57 V 14.3 V Lower Limit -14.3 V -3.57 V -1.43 V -143.0 mV 137.0 mV 1.37 V 3.43 V 13.7 V
1 Set up the oscilloscope according to the table above. a Press the Chan key. b Move the cursor to the V/Div field, then use the RPG knob to dial in the V/Div values shown on the first line of the table. c Move the cursor to the Offset field. Use the front-panel keyboard to enter the offset value shown on the first line of the table. Use the left and right cursor-control keys to select either mV or V. 2 Acquire the zero input voltage. a Disconnect the power supply from the channel input. b Press the blue shift key, then press the Run key. Wait for approximately five seconds (averaging complete), then press Stop. c Press the Markers key. Move the cursor to the Va Volts field. Using the RPG knob, move the Va marker over the oscilloscope trace on the display. 3 Acquire the measured voltage. a Connect the power supply to the channel input. Set the power supply voltage according to the first line of the table above. b Press the blue shift key, then press the Run key. Wait for approximately five seconds (averaging complete), then press Stop. c Press the Markers key. Move the cursor to the Vb Volts field. Using the RPG knob, move the Vb marker over the oscilloscope trace on the display. d Record the voltage in the Va to Vb field in the performance test record. 4 Repeat steps 1 through 3 for the second line of the table, then for the rest of the lines
of the table for channel 1. 5 Repeat from "Set up the logic analyzer" for channel 2, replacing channel 1 with channel 2 where applicable.
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