Zenith P42W34, Service Manual

Page: 17 / 39

1. Application
These instructions apply to the P42W34 PDP monitor.
2. Notes
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test instruments.
(2) Adjustments must be performed in the correct order.
(3) The adjustments must be performed in conditions between
68° and 86°F with 55-75% relative humidity.
(4) The input voltage of the receiver must keep at 100~240V,
50/60Hz during adjustment(s).
(5) The receiver must be operated for at least 15 minutes prior
to the adjustment(s).
1) The receiver must be operated receiving 100% white
pattern, prior to adjustment(s).
(White condition in HEAT-RUN mode)
2) Enter into HEAT-RUN mode
- Press the POWER ON KEY on Adjustment R/C.
- OSD display HEAT-RUN WHITE and screen display
100% full WHITE PATTERN.
[
Set is activated HEAT-RUN without signal generator in
this mode.
[
Single color pattern of HEAT-RUN mode uses to check
PANEL. (RED/BLUE/GREEN)
[Caution] If you turn on a still screen more than 20 minutes
(such as Cross Hatch Pattern, Digital Pattern), an
afterimage may be occur in the black level part of the
screen. (Image Burn)
O
Data values, adjusted in the board, are valid until the VSC
Board is dissued and must be protected. For the protection of
data, Micom does not permit any more adjustments after
completion.
O
In case of re-adjustment, operate First Value Setting.
Each PCB Assy must be checked prior to installation.
(Especially, be careful Power PCB Assy which can cause
damage to PDP Module.)
3. POWER PCB Assy Voltage
Adjustments
(Va, Vs Voltage Adjustments)
3-1 Test Equipment :
Digital Multi-Meter (DMM)
3-2 Connection Diagram for Measuring
Refer to Fig 1.
3-3 Adjustment Method
(1) Va Adjustment
1) Select White Mode of HEAT RUN or receive a 100%
Full White Pattern with the Video/RGB from a Pattern
Generator.
2) Connect the + terminal of the DMM to Va pin of P805
and the - terminal of the DMM to GND pin of P805.
3) Adjust RV601 until the reading of Va on the DMM is the
same as Va voltage on label of panel Right/Top.
(Deviation : ±0.5V)
(2) Vs adjustment
1) Connect the + terminal of the DMM to Vs pin of P805
and the - terminal of the DMM to GND pin of P805.
2) Adjust RV401 until the reading of Vs on the DMM is the
same as Vs voltage on label of panel Right/Top.
(Deviation : ±0.5V)
4. Auto ADC Adjustments
4-1 RGB Auto Offset & Gain Adjustment
(1) Input Half Black/White (255 Gray) signal from a Pattern
Generator into the RGB Input.
(XGA 1024*768 60Hz)
- 17 -
ADJUSTMENT INSTRUCTIONS
DMM
+ -
RV401
Vs ADJ
RV601
Va ADJ
P804
P805
Vs
NC
Va
GND
DMM
+ --
RV401
Vs ADJ
RV601
Va ADJ
P804
P805
RV401
Vs ADJ
RV601
Va ADJ
P804
P805
Vs
NC
Va
GND
Vs
NC
Va
GND
<Fig 1> Connection Diagram of Power Adjustments
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