Service manual

6-9
VL-H870U
VL-H875U
VL-H890U
VL-H870U
VL-H875U
VL-H890U
12. Adjustment of Y-FM deviation (Normal-8)
Measuring instrument Oscilloscope
Mode REC/PB (self-playback/recording)
Input signal Color bar
Measuring point TL3402
Adjustment address 61
Adjustment level 500 ± 20 mVp-p
(1) Set the recordable tape.
(2) Before entering the adjustment mode,make self-playback/recording of color bar with an external output.
Measure whether the playback output at this time is 500 mVp-p on TL3402 (STANDARD TAPE).
(3) Enter the VCR adjustment mode with an adjustment remote control, and select the address 61.
Select the address, using the FF or REW key, and fix it with the PB key.
(4) When decreasing by 10 mVp-p as compared to the measurement value of (2), decrease the data of address 61 by about 5 (digit).
(Reference)
When increasing by 10 mVp-p as compared to the measurement value of (2), increase the data of address 61 by about 5 (digit).
(Reference)
Select the address, using the FF or REW key, and fix it with the PB key.
(5) Release the adjustment mode, and make self-playback/recording again. When the measuring value at this time is in the standard
value, the adjustment is completed. If it is not in the standard value, repeat the steps (2) -(4).
(6) After completing the adjustment of (5), check the adjusting value of Y-FM carrier f0 (4.38 MHz in no input).
When the measuring value exceeds the standard value of carrier f0, make an adjustment of Y-FM carrier f0 again.
13. Adjustment of REC-Y equalizer (Hi-8 ME)
Measuring instrument Oscilloscope
Mode VCR STOP
Input signal Color bar
Measuring point TL7443
Adjustment address 58
Adjustment level 420 ± 20 mVp-p
(1) Input the color bar signal into the video input/output terminal in the VCR STOP mode.
(2) Enter the VCR adjustment mode with an adjustment remote control, and select the address 58.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so that the SYNC TIP portion gets 420mVp-p on TL7443.
Select the data, using the FF or REW key, and fix it with the PB key.
After the adjustment, press the STOP key, and exit from the adjustment address 58.
Measuring instrument Oscilloscope
Mode VCR STOP
Input signal Color bar
Measuring point TL7443
Adjustment address 31
Adjustment level 315 ± 20 mVp-p
(1) Input the color bar signal into the video input/output terminal in the VCR STOP mode.
(2) Enter the VCR adjustment mode with an adjustment remote control, and select the address 31.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so that the SYNC TIP portion gets 315mVp-p on TL7443.
Select the data, using the FF or REW key, and fix it with the PB key.
After the adjustment, press the STOP key, and exit from the adjustment address 31.
14. Adjustment of REC-Y equalizer (Hi-8 MP)
Measuring instrument Oscilloscope
Mode VCR STOP
Input signal Color bar
Measuring point TL7443
Adjustment address 63
Adjustment level 400 ± 20 mVp-p
15. Adjustment of REC-Y equalizer (Normal-8 ME)
(1) Input the color bar signal into the video input/output terminal in the VCR STOP mode.
(2) Enter the VCR adjustment mode with an adjustment remote control, and select the address 63.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so that the SYNC TIP portion gets 400 mVp-p on TL7443.
Select the data, using the FF or REW key, and fix it with the PB key.
After the adjustment, press the STOP key, and exit from the adjustment address 63.
500 ± 20 mVp-p
420 mVp-p
SYNC
(TL3402)
315 mVp-p
SYNC
(TL3402)
400 mVp-p
SYNC
(TL3402)