Service manual

6-11
VL-H870U
VL-H875U
VL-H890U
VL-H870U
VL-H875U
VL-H890U
(1) Connect the oscilloscope to TL605.
(2) Play back the stereo standard tape (JiGWR5-9NS), and
adjust so that the waveform envelop of TL605 becomes as
smooth as possible. Whenever the TELE. WIDE key of adjust-
ment remote controller is pressed, waveform MAIN/SUB is
switched. Select the point which gives the flattest possible
envelope.
Note: The data enclosed in the brackets [ ] are for the sub-channel.
1. Adjustment of filter f0
6-3-6. Adjustment of audio circuit
Measuring instrument Oscilloscope
Mode Playback
Input signal —
Measuring terminal TL605
Adjustment address VCR ADJ 05F
Set value —
2. Playback level adjustment
(1) Before adjustment record the current data of adjustment
address 05E and 05D.
(2) Be sure to connect the voltage mater to TL608 [TL607].
(3) Play back the stereo standard tape (JiGWR5-9NS), and adjust
so as to get an indication -7.5 dBs ±0.5 dB.
(4) Watching alternately TL608 and TL607, repeat adjustment of
05E and 05D.
(5) If data differs significantly from the first record value, this
implies adjustment failure.
Measuring instrument Voltage mater
Mode Playback
Input signal —
Measuring terminal TL608 [TL607]
Adjustment address VCR ADJ 05E [05D]
Set value -7.5 dBs ±0.5 dB
4. Contrast adjustment
Measuring point TL1814 (G-OUT)
Address 40
Mode VCR AV input
Adjusting method 1) Set the data of address 47 at the address 80.
2) Input white 100% as an AV input.
3) Connect TL1804 to GND. (The 1H inversion stops.)
4) Connect 220 KΩ between TL802 and GND.
5) Seeing the waveform of TL1814 (G-OUT), make an adjustment between the
white peak and the sync tip.
Adjustment standard 3.35V ± 0.1V
Remarks ———————
V
5. R-W/B adjustment
Measuring point TL1814 (G-OUT) TL1813 (R-OUT)
Address 41
Mode VCR AV input
Adjusting method 1) AV input: Nonsignal.
2) TL1814 (G-OUT): Oscilloscope CH1
TL1813 (R-OUT): Oscilloscope CH2
3) Adjust P-P of TL1813 becomes bigger 0.15V than TL1814.
Adjustment standard ±0.1Vp-p
Remarks ———————
G R
6. B-W/B adjustment
Measuring point TL1814 (G-OUT) TL1815(B-OUT)
Address 42
Mode VCR AV input
Adjusting method 1) AV input: Nonsignal.
2) TL1814 (G-OUT): Oscilloscope CH1
3) TL1815 (B-OUT): Oscilloscope CH2
4) Adjust P-P of TL1815 become bigger 0.1V than TL1814.
Adjustment standard ±0.1Vp-p
Remarks ———————
1. LCD Data Setting
6-3-7. Adjustment of LCD display circuit
Adjustment procedures and connections are the same as with the VCR section. (Refer to item 6-3-3)
VCR ADJ
Address Data
4C 7A
4D B5
4E 8A
4F E5
50 64
51 A9
52 8A
53 E5
4B 20
3B 40
2. Touch Panel Data Setting 3. Inverter input Voltage Setting
VCR ADJ
Address Data
EC 30
ED 2B
EE BA
EF AA
F0 0C
VCR ADJ
Address Data
10 D9
11 3 type BD
3.5 type C6
12 3 type 99
3.5 type A3