Sharp VL-H870U Service Manual page 35

VL-H870U
VL-H875U
VL-H890U
6-3-6. Adjustment of audio circuit
Note: The data enclosed in the brackets [ ] are for the sub-channel.
1. Adjustment of filter f0
Measuring instrument
Mode
Input signal
Measuring terminal
Adjustment address
Set value
2. Playback level adjustment
Measuring instrument
Mode
Input signal
Measuring terminal
Adjustment address
Set value
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)
1. LCD Data Setting
VCR ADJ
Address Data
4C 7A
4D B5
4E 8A
4F E5
50 64
51 A9
52 8A
53 E5
4B 20
3B 40
4. Contrast adjustment
Measuring point
Address
Mode
Adjusting method
Adjustment standard 3.35V ± 0.1V
Remarks
5. R-W/B adjustment
Measuring point
Address
Mode
Adjusting method
Adjustment standard ±0.1Vp-p
Remarks
6. B-W/B adjustment
Measuring point
Address
Mode
Adjusting method
Adjustment standard ±0.1Vp-p
Remarks
Oscilloscope
Playback
—
TL605
VCR ADJ 05F
—
Voltage mater
Playback
—
TL608 [TL607]
VCR ADJ 05E [05D]
-7.5 dBs ±0.5 dB
2. Touch Panel Data Setting
VCR ADJ
Address
EC
ED
EE
EF
F0
TL1814 (G-OUT)
40
VCR AV input
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.
———————
TL1814 (G-OUT) TL1813 (R-OUT)
41
VCR AV input
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.
———————
TL1814 (G-OUT) TL1815(B-OUT)
42
VCR AV input
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.
———————
(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.
(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.
3. Inverter input Voltage Setting
Data Address
30 10
2B 11
BA
AA 12
0C
6-11
VCR ADJ
Data
D9
3 type BD
3.5 type C6
3 type 99
3.5 type A3
VL-H870U
VL-H875U
VL-H890U
V
G R