6-10
VL-H870U
VL-H875U
VL-H890U
VL-H870U
VL-H875U
VL-H890U
Measuring instrument
Oscilloscope
Mode
VCR STOP
Input signal
Color bar
Measuring point
TL7443
Adjustment address
3A
Adjustment level
400
±
20 mVp-p
16. Adjustment of REC-Y equalizer (Normal-8 MP)
(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 3A.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so taht 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 3A.
17. Adjustment of REC-C equalizer
Measuring instrument
Oscilloscope
Mode
VCR STOP
Input signal
Color bar
Measuring point
TL7441
Adjustment address
59
Adjustment level
114
±
10 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 59.
Select the address, using the FF or REW key, and fix it with the PB key.
(3) Make an adjustment so taht the SYNC TIP portion gets 114 mVp-p on TL7441.
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 59.
18. Adjustment of Y recording current
Measuring instrument
Oscilloscope
Mode
EE (VCR STOP)
Input signal (Tape)
Color bar
Test point
CH1; TL7410/TL7401 (GND)
CH2; TL7409/TL7401 (GND)
Adjustment address
105
Adjustment level
144
±
10 mVp-p
(1) Connect TL7455 and TL 7453 with a proper short-jumper.
(2) Select the address105.
(3) Set the oscilloscope.
1
Connect the SIG side of oscilloscope CH1 probe to the TL7410, the GND side to the TL7401.
2
Connect the SIG side of oscilloscope CH2 probe to the TL7409, the GND side to the TL7401.
3
Using the oscilloscope, invert either CH1 or CH2 signal, and add two signals.
4
At this time match the CH1 and CH2 volts levels.
(4) Change the data value, and make an adjustment to get the specified value at SYNC position.
Measuring instrument
Oscilloscope
Mode
EE (VCR STOP)
Input signal (Tape)
Color bar
Test point
CH1; TL7410/TL7401 (GND)
CH2; TL7409/TL7401 (GND)
Adjustment address
104
Adjustment level
34
±
2 mVp-p
19. Adjustment of C recording current
(1) Connect TL7454 and TL 7453 with a proper short-jumper.
(2) Select the address104.
(3) Set the oscilloscope.
1
Connect the SIG side of oscilloscope CH1 probe to the TL7410, the GND side to the TL7401.
2
Connect the SIG side of oscilloscope CH2 probe to the TL7409, the GND side to the TL7401.
3
Using the oscilloscope, invert either CH1 or CH2 signal, and add two signals.
4
At this time match the CH1 and CH2 volts levels.
(4) Change the data value, and make an adjustment to get the specified value at Red position.
114 mVp-p
Red part
34 mVp-p
Red part
400 mVp-p
SYNC
(TL3402)
144 mVp-p
SYNC
(TL3402)
Summary of Contents for VL-H870U
Page 46: ...VL H870U VL H875U VL H890U 4 1 3 2 LOCATION MAP 3 4 S R Q P O N M L K J 8 3 ...
Page 50: ...VL H870U VL H875U VL H890U 8 7 S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 RIMOCON JACK UNIT ...
Page 54: ...VL H870U VL H875U VL H890U S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 8 11 LCD PANEL ...
Page 58: ...VL H870U VL H875U VL H890U S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 8 15 ...
Page 64: ...VL H870U VL H875U VL H890U 8 21 S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 ...
Page 67: ...VL H870U VL H875U VL H890U 8 24 10 11 12 13 14 15 16 17 18 19 ...
Page 70: ...VL H870U VL H875U VL H890U 8 27 S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 ...
Page 74: ...VL H870U VL H875U VL H890U 8 31 S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 ...
Page 77: ...VL H870U VL H875U VL H890U 8 34 10 11 12 13 14 15 16 17 18 19 ...
Page 80: ...VL H870U VL H875U VL H890U 8 37 S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 ...
Page 83: ...VL H870U VL H875U VL H890U 8 40 10 11 12 13 14 15 16 17 18 19 ...
Page 85: ...VL H870U VL H875U VL H890U 8 42 10 11 12 13 14 15 16 17 18 19 ...
Page 88: ...VL H870U VL H875U VL H890U 8 45 S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 ...
Page 92: ...VL H870U VL H875U VL H890U S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 8 49 ...
Page 95: ...VL H870U VL H875U VL H890U 8 52 10 11 12 13 14 15 16 17 18 19 ...
Page 97: ...VL H870U VL H875U VL H890U 8 54 10 11 12 13 14 15 16 17 18 19 ...
Page 100: ...VL H870U VL H875U VL H890U S R Q P O N M L K J 4 1 3 2 LOCATION MAP 3 4 8 57 ...
Page 103: ...VL H870U VL H875U VL H890U 8 60 10 11 12 13 14 15 16 17 18 19 ...
Page 105: ...VL H870U VL H875U VL H890U 8 62 10 11 12 13 14 15 16 17 18 19 ...
Page 107: ...VL H870U VL H875U VL H890U 8 64 10 11 12 13 14 15 16 17 18 19 ...
Page 109: ...VL H870U VL H875U VL H890U 8 66 10 11 12 13 14 15 16 17 18 19 ...
Page 112: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 2 Wiring Side SIDE A ...
Page 114: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 4 Wiring Side SIDE B ...
Page 116: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 6 Wiring Side SIDE A ...
Page 118: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 8 Wiring Side SIDE B ...
Page 120: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 10 Wiring Side SIDE A ...
Page 122: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 12 Wiring Side SIDE B ...
Page 125: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 15 Wiring Side SIDE A ...
Page 126: ...A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL H870U VL H875U VL H890U 10 16 Wiring Side SIDE B ...