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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.
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Helpd me mont a new carradio when prewius mont was a mess.
4-5. Temperature Compensation Offset Adjustment
Save the temperature data at that time in the non-volatile memory as 25 �C reference data. Note : 1. Usually, do not perform this adjustment. 2. Perform this adjustment in an ambient temperature of 22 �C to 28 �C. Perform it immediately after the power is turned on when the internal temperature of the unit is the same as the ambient temperature. 3. When D101 has been replaced, perform this adjustment after the temperature of this part has become the ambient temperature. Adjusting Method : 1. Rotate the AMS knob and display �TEMP ADJUST�. 2. Press the ENTER/YES button and select the �TEMP ADJUST� mode. 3. �TEMP = � and the current temperature data will be displayed. 4. To save the data, press the ENTER/YES button. When not saving the data, press the EDIT/NO button. 5. When the ENTER/YES button is pressed, �TEMP = SAVE� will be displayed for some time, followed by �TEMP ADJUST�. When the EDIT/NO button is pressed, �TEMP ADJUST� will be displayed. Specifications : The �TEMP = � should be within �E0 - EF�, �F0 - FF�, �00 - 0F�, �10 - 1F� and �20 - 2F�.
4-6. Laser Power Adjustment
Connection :
Laser power meter
Optical pick-up objective lens
Digital voltmeter
BD board TP (I + 5V) TP (IOP)
Adjusting Method : 1. Set the laser power meter on the objective lens of the optical pickup. (When it cannot be set properly, press the 0 button or ) button and move the optical pickup.) Connect the digital volt meter to TP (IOP) and TP (I+5V). 2. Rotate the AMS knob and display �LDPWRADJUST�. (Laser power : For adjustment) 3. Press the ENTER/YES button twice and display �LD $ 4B = 3.5 mW�. 4. Adjust RV102 of the BD board so that the reading of the laser power meter becomes 3.4 +0.1 mW. �0 5. Press the ENTER/YES button and display �LD $ 96 = 7.0 mW�. (Laser power:MO reading) 6. Check that the laser power meter and digital voltmeter readings satisfy the specified value. Specification :
Laser power meter reading : 7.0 ± 0.3 mW Digital voltmeter reading : Optical pickup displayed value ± 10%
(Optical pickup label)
KMS
210A 27X40 B0825
lop = 82.5 mA in this case lop (mA) = Digital voltmeter reading (mV)/ 1 (�)
7. Press the ENTER/YES button and display �LD $ 0F = 0.7 mW�. (Laser power: MO reading) 8. Check that the laser power meter at this time satisfies the specified value. Specification :
Laser power meter reading : 0.70 ± 0.1 mW
9. Press the EDIT/NO button and display �LDPWR ADJUST�, and stop laser emission. (The EDIT/NO button is effective at all times to stop the laser emission.)
� 40 �
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