Adjustment Of Audio Circuit; Adjustment Of Lcd Display Circuit - Sharp VL-A111S/H/E Service Manual

5-6-3-4. Adjustment of audio circuit

1. Adjustment of filter f0
Measuring instrument Oscilloscope
Mode PB
Input signal (tape) JiGWR5-5CSP
Measuring terminal TL605/AUDIO.OUT
Adjustment address 33 (VTR ADJ)
Set value Clear the waveform
Audio check (Check of recording/playback using the same unit)
(1) In the camera mode, perform recording with the sound input to the microphone.
(2) Play back the recorded portion to check that the recorded sound is heard from the output terminal or built-in speaker.
(3) If excessive noise is recorded, repeat steps (1) - (6) and check the recording/playback again.

5-6-3-5. Adjustment of LCD display circuit

1. Inverter input Voltage Setting
VTR ADJ
Address Data
50 8F
51 8A
52 6F
2. Dac full-Scalle adjustment
Measuring point TL1801 (G-OUT)
Address(VTR ADJ) 039
Mode VCR
Adjusting method 1) Set the data of address 082 to 80, address 0A2 to 00, address 0A5 to 80.
2) Connect TL3804 to P-CON 3.1V.
3) Connect the Digital voltmeter to TL801 and adjust the DC volt.
4) Set the data of address 082 to 40, address 0A2 to 28. (Restore)
Adjustment standard 0.78V ± 10mV
Remarks ———————
3. R-W/B adjustment
Measuring point TL3814 (G-OUT) TL3813 (R-OUT)
Address(VTR ADJ) 090
Mode VCR
Adjusting method 1) Set the data of address 082 at the address 80.
2) TL3814 (G-OUT): Oscilloscope CH1
TL3813 (R-OUT): Oscilloscope CH2
3) Adjust P-P of TL3813 to make it larger then TL3814 by 0.15V.
4) Set the data of address 082 at the address 40. (Restore)
Adjustment standard ±0.1Vp-p
Remarks ———————
4. B-W/B adjustment
Measuring point TL3814 (G-OUT) TL3815(B-OUT)
Address(VTR ADJ) 092
Mode VCR
Adjusting method 1) Set the data of address 082 at the address 80.
2) TL3814 (G-OUT): Oscilloscope CH1
TL3815 (B-OUT): Oscilloscope CH2
3) Adjust P-P of TL3815 to make it larger then TL3814 by 0.1V.
4) Set the data of address 082 at the address 40. (Restore)
Adjustment standard ±0.1Vp-p
Remarks ———————
1) Set the alignment tape (JiGWR5-5CSP).
2) Using the adjustment remote control (RRMCG0033TASA),
set the VCR adjustment mode, and set the address "33" with
the operation switch ("FF", "REW" key).
3) Play back the standard tape.
4) Using the operation switch ("FF", "REW" key), make an
adjustment so that the most clear playback waveform is
obtained on TL605.
5) Press the operation switch ("PLAY" key) to write the data.
6) Press the operation switch ("STOP" key) to exit from the
address "33".
(The address "33" blinks.)
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VL-A111S/H/E/AH131S/H/E
VL-AH151S/H/E
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