Sharp VL-A111UL Service Manual - Page 31

VL-A111U/AH131U, VL-AH151U/AH161U, VCO adjustment, COMMON PULSE adjustment, H-position adjustment,

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5. VCO adjustment Measuring point Address(VTR ADJ) Mode Adjusting method Adjustment standard Remarks TL3802 03E VCR 1) Connect TL3803 to GND. 2) Connect the frequency counter to TL3802, and adjust the frequency. 15.734kHz ± 100Hz ------- VL-A111U/AH131U VL-AH151U/AH161U 6. H-position adjustment Measuring point TL3802 Address(VTR ADJ) 03B Mode VCR Adjusting method 1) Connect the oscilloscope to TL3802, and adjust the pulse width. t V Adjustment standard 3 type: 2.8µsec ±0.15µsec (A111U/AH131U/AH151U), 3.5 type: 3.7µsec ±0.15µsec (AH161U) Remarks ------- 7. COMMON PULSE adjustment Measuring point TL1801 Address(VTR ADJ) 037 Mode VCR Adjusting method 1) Set the data of address 0A5 at the address 80. 2) Connect TL1800 to GND. 3) Connect the Digital voltmeter to TL1801, and adjust the DC Volt. Adjustment standard 6.85V ± 50mV Remarks ------- 8. COM-BIAS adjustment Measuring point LCD panel display surface Address(VTR ADJ) 03C Mode VCR Adjusting method 1) Set data of address 0A5 at the address 80 and address 082 at the address A9. 2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface (do not allow entry of external light). 3) Connect the illuminometer to the oscilloscope. 4) Make an adjustment so as to minimize the ripple of output waveform. Response time: 0.6 sec 5) Adjust again if longitudinal stripe appears evidently. 6) Set data of address 082 at the address 40. (Restore) * Or set to the point where the black is settled deepest with the grey scale signal. Adjustment standard Minimum Remarks Make an adjustment after aging for 5 minutes or more. 9. W/B adjustment Measuring point Address(VTR ADJ) Mode Adjusting method Adjustment standard Remarks LCD panel display surface 090, 092 VCR 1) Set data of address 0A5 at the address 80, and address 082 at the address A9. 2) Adjust so as to get the same white screen as that of standard monitor. (Adjust again, visually checking as stated in items 3 and 4.) 3) Set data of address 082 at the address 40. (Restore) Standard monitor Make an adjustment after aging for 5 minutes or more. 31

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31
VL-A111U/AH131U
VL-AH151U/AH161U
5. VCO adjustment
Measuring point
TL3802
Address(VTR ADJ)
03E
Mode
VCR
Adjusting method
1) Connect TL3803 to GND.
2) Connect the frequency counter to TL3802, and adjust the frequency.
Adjustment standard
15.734kHz
±
100Hz
Remarks
———————
Measuring point
TL1801
Address(VTR ADJ)
037
Mode
VCR
Adjusting method
1) Set the data of address 0A5 at the address 80.
2) Connect TL1800 to GND.
3) Connect the Digital voltmeter to TL1801, and adjust the DC Volt.
Adjustment standard
6.85V
±
50mV
Remarks
———————
7. COMMON PULSE adjustment
Measuring point
TL3802
Address(VTR ADJ)
03B
Mode
VCR
Adjusting method
1) Connect the oscilloscope to TL3802, and adjust the pulse width.
Adjustment standard
3 type: 2.8
μ
sec
±
0.15
μ
sec (A111U/AH131U/AH151U), 3.5 type: 3.7
μ
sec
±
0.15
μ
sec (AH161U)
Remarks
———————
6. H-position adjustment
t
V
Measuring point
LCD panel display surface
Address(VTR ADJ)
03C
Mode
VCR
Adjusting method
1) Set data of address 0A5 at the address 80 and address 082 at the address A9.
2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface (do not allow entry of external light).
3) Connect the illuminometer to the oscilloscope.
4) Make an adjustment so as to minimize the ripple of output waveform.
Response time: 0.6 sec
5) Adjust again if longitudinal stripe appears evidently.
6) Set data of address 082 at the address 40. (Restore)
*
Or set to the point where the black is settled deepest with the grey scale signal.
Adjustment standard
Minimum
Remarks
Make an adjustment after aging for 5 minutes or more.
8. COM-BIAS adjustment
Measuring point
LCD panel display surface
Address(VTR ADJ)
090, 092
Mode
VCR
Adjusting method
1) Set data of address 0A5 at the address 80, and address 082 at the address A9.
2) Adjust so as to get the same white screen as that of standard monitor. (Adjust again, visually checking as
stated in items 3 and 4.)
3) Set data of address 082 at the address 40. (Restore)
Adjustment standard
Standard monitor
Remarks
Make an adjustment after aging for 5 minutes or more.
9. W/B adjustment