Sharp VL-H870U Service Manual page 31

VL-H870U
VL-H875U
VL-H890U
2. Adjustment of EE Y level
Measuring instrument
Mode
Input signal
Measuring point
Adjustment address
Adjustment level
(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 32.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so as to get 500 mVp-p between SYNC TIP and WHITE PEAK on TL3402.
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 32.
3. Adjustment of comb filter
Measuring instrument
Mode
Input signal
Measuring point
Adjustment address
Adjustment level
(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 36.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so as to minimize the chroma component on TL414.
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 36.
(4) Enter the VCR adjustment mode with an adjustment remote control, and select the address 37.
Select the address, using the FF or REW key, and fix it with the PB key.
(5) Make an adjustment so as to minimize the chroma component on TL414.
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 37.
(6) Repeat the steps (2) - (3).
4. Adjustment of Y emphasis level
Measuring instrument
Mode
Input signal
Measuring point
Adjustment address
Adjustment level
(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 56.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so as to get 500mVp-p between SYNC TIP and WHITE PEAK on TL408.
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 56.
5. Adjustment of Y de-emphasis (Hi-8)
Measuring instrument
Mode
Input signal
Measuring point
Adjustment address
Adjustment level
(1) Set the color bar tape for alignment (JiGWR5-8NSE).
(2) Enter the VCR adjustment mode with an adjustment remote control, and select the address 57.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so as to get 500mVp-p between SYNC TIP and WHITE PEAK on TL405
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 57.
6. Adjustment of Y de-emphasis (Normal-8)
Measuring instrument
Mode
Input signal
Measuring point
Adjustment address
Adjustment level
(1) Set the color bar tape for alignment (JiGWR5-5NSP).
(2) Enter the VCR adjustment mode with an adjustment remote control, and select the address 62.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so as to get 500mVp-p between SYNC TIP and WHITE PEAK on TL405.
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 62.
Oscilloscope
VCR STOP
Color bar
TL3402, TL8356 (GND)
32
500 ± 20 mVp-p
Oscilloscope
VCR STOP
Color bar
TL414, TL8356 (GND)
Phase: 36, Gain: 37
Minimum chroma component
Oscilloscope
VCR STOP
Color bar
TL408, TL8356(GND)
56
500 ± 20 mVp-p
Oscilloscope
PB
Color bar (JiGWR5-8NSE)
TL405, TL8356(GND)
57
500 ± 20 mVp-p
Oscilloscope
PB
Color bar (JiGWR5-5NSP)
TL405, TL8356(GND)
62
500 ± 20 mVp-p
500 ± 20 mVp-p
500 ± 20 mVp-p
500 ± 20 mVp-p
500 ± 20 mVp-p
6-7
Minimum chroma component
VL-H870U
VL-H875U
VL-H890U