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6.3 MAIN UNIT ADJUSTMENT
VOFS/VH/IC5V Voltage Adjustment
Adjusting Point
Input Signal
VR2701 (VOFS)
(Y DRIVE Assy)
White 100%
VR2703 (VH)
(Y DRIVE Assy)
VR2702 (IC5V)
(Y DRIVE Assy)
Note : Be sure to measure between specified test points.
VOFS (Offset voltage) adjustment
Method 1
1. Write down a adjustment value of V-OFFSET mode with the GAJ
of RS-232C command.
2. Set this adjustment value to center (128). → Transmits a VOF 128 command.
3. Adjust VR2701 so that the voltage between K2701 (VOFS) and K2703 (SUS GND) becomes
45V.
4. Return it to the value that wrote down a adjustment value of V-OFFSET in step 1.
→ Transmits a command of VOF "the value that wrote down a adjustment value".
Method 2
1. Read the adjustment value of V-OFFSET mode with the GAJ of
RS-232C command.
2. Adjust VR2701 so that the voltage between K2710 (VOFS) and K2703 (SUS GND) becomes
following voltage ± 0.5V.
Input
DAC
Setting
Command
Output
Voltage
VOF000
0.4
VOF006
0.4984375
25.9375
VOF013
0.61328125
27.03125
VOF019
0.71171875
27.96875
VOF026
0.8265625
29.0625
VOF032
0.925
VOF038
1.0234375
30.9375
VOF045
1.13828125
32.03125
VOF051
1.23671875
32.96875
VOF058
1.3515625
34.0625
VOF064
1.45
VOF070
1.5484375
35.9375
VOF077
1.66328125
37.03125
VOF083
1.76171875
37.96875
VOF090
1.8765625
39.0625
VOF096
1.975
VOF102
2.0734375
40.9375
VOF109
2.18828125
42.03125
VOF115
2.28671875
42.96875
VOF122
2.4015625
44.0625
VOF128
2.5
The symptom is case of mis-adjustment
If the VOFS Voltage adjustment is not performed properly, dots like blinking luminance points
appear. If deviated greatly from the right adjustment point, panel will light white.
VH (voltage for scan IC) Adjustment
Adjust so that the voltage between K2716 (VH) and K2720 (PSUS) becomes 103V ± 0.5V.
PSUS (=GNDH) is a floating GND and the electric potential is different from that of chassis
GND. Be sure not to short-circuit PSUS (=GNDH) and another GND, because that may
damage the unit.
The symptom is case of mis-adjustment
If the VH adjustment is not performed properly, dots like blinking luminance points appear. If
deviated greatly from the right adjustment point, panel will light white.
IC5V Adjustment
Adjust so that the voltage between K2707 (IC5V) and K2720 (PSUS) becomes 5.0V ± 0.1V.
PSUS (=GNDH) is a floating GND and the electric potential is different from that of chassis
GND. Be sure not to short-circuit PSUS (=GNDH) and another GND, because that may
damage the unit.
Adjusting Method
Input
DAC
Command
Output
25
VOF134
2.599212598
45.94488
VOF141
2.71496063
47.04724
VOF147
2.814173228
47.99213
VOF153
2.913385827
48.93701
VOF160
3.029133858
50.03937
30
VOF166
3.128346457
50.98425
VOF172
3.227559055
51.92913
VOF179
3.343307087
VOF185
3.442519685
53.97638
VOF191
3.541732283
54.92126
35
VOF198
3.657480315
56.02362
VOF204
3.756692913
VOF211
3.872440945
58.07087
VOF217
3.971653543
59.01575
VOF223
4.070866142
59.96063
40
VOF230
4.186614173
61.06299
VOF236
4.285826772
62.00787
VOF242
4.38503937
62.95276
VOF249
4.500787402
64.05512
VOF255
4.6
45
PDU-50WX2
Setting
Voltage
53.0315
56.9685
65
51
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