PDP-433PU
68
1234
1234
C
D
F
A
B
E
6.3 ADJUSTMENT
VOFS (Offset voltage) adjustment
Method 1
1. Make a note of the adjustment value of VOFS ADJ in factory mode.
2. Set the VOFS ADJ adjustment value to center (128).
3. Turn the VR2701 so that the voltage between K2710 (VOFS) and K2703 (SUS GND)
becomes 45V.
4. Return the VOFS ADJ adjustment value to that which you wrote down in Step 1.
Method 2
1. Read the adjustment value of VOFS ADJ in the factory mode.
2. Turn the VR2701 so that the voltage between K2710 (VOFS) and K2703 (SUS GND)
becomes the corresponding value indicated in the table below (tolerance: ± 5):
VH (voltage for the scan IC) Adjustment
Adjust so that the voltage between K2716 (VH) and K2720 (PSUS) becomes 130V ± 0.5V.
PSUS (=GNDH) is a floating GND and its 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.
Signs of improper adjustment
If the VH adjustment is not performed properly, blinking luminance points like dots appear.
If the voltage is deviated greatly from the right adjustment point, the panel will lturn white
when lit.
Input Signal
Adjusting Point
Adjusting Method
White 100%
VR2701 (VOFS)
(Y DRIVE Assy)
VR2703 (VH)
(Y DRIVE Assy)
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 its 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.
Signs of improper adjustment
If the VOFS Voltage adjustment is not performed properly, blinking luminance points like dots
appear. If the voltage deviates greatly from the right adjustment point, the panel will turn white
when lit.
VR2702 (IC5V)
(Y DRIVE Assy)
Note : Be sure to measure between specified test points.
Input
Command
DAC
Output
Setting
Voltage
Input
Command
DAC
Output
Setting
Voltage
VOF000 0.4 25 VOF134 2.599212598 45.94488
VOF006 0.4984375 25.9375 VOF141 2.71496063 47.04724
VOF013 0.61328125 27.03125 VOF147 2.814173228 47.99213
VOF019 0.71171875 27.96875 VOF153 2.913385827 48.93701
VOF026 0.8265625 29.0625 VOF160 3.029133858 50.03937
VOF032 0.925 30 VOF166 3.128346457 50.98425
VOF038 1.0234375 30.9375 VOF172 3.227559055 51.92913
VOF045 1.13828125 32.03125 VOF179 3.343307087 53.0315
VOF051 1.23671875 32.96875 VOF185 3.442519685 53.97638
VOF058 1.3515625 34.0625 VOF191 3.541732283 54.92126
VOF064 1.45 35 VOF198 3.657480315 56.02362
VOF070 1.5484375 35.9375 VOF204 3.756692913 56.9685
VOF077 1.66328125 37.03125 VOF211 3.872440945 58.07087
VOF083 1.76171875 37.96875 VOF217 3.971653543 59.01575
VOF090 1.8765625 39.0625 VOF223 4.070866142 59.96063
VOF096 1.975 40 VOF230 4.186614173 61.06299
VOF102 2.0734375 40.9375 VOF236 4.285826772 62.00787
VOF109 2.18828125 42.03125 VOF242 4.38503937 62.95276
VOF115 2.28671875 42.96875 VOF249 4.500787402 64.05512
VOF122 2.4015625 44.0625 VOF255 4.6 65
VOF128 2.5 45
VOFS/VH/IC5V Voltage Adjustment
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