Zenith P50W28A Series, Service Manual

Page: 17 / 36

1. Application Object
These instructions are applied to all of the PDP monitor, RF-
02CA.
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 instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity.
(4) The input voltage of the receiver must keep 110~240V,
50/60Hz in adjusting.
(5) The receiver must be operated for about 15 minutes prior
to the adjustment.
1) After receiving 100% white pattern (06CH), the receiver
must be operate prior to adjustment. (Or white condition
in HEAT-RUN mode)
2) Enter into HEAT-RUN mode
- Press the POWER ON KEY on R/C for adjustment.
- 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), a afterimage may be
occur in the black level part of the screen.
3. RGB Auto Cut-Off & MIN Bias
Adjustment
(1) Input Full Back (0 Gray) signal which generated from
Pattern Generator into CVBS and RGB1 Input part.
(2) Press POWER ON KEY on R/C for adjustment and select
AUTO-CUT(Cut-off Auto Adjustment)
(3) Press Vol. + key and operate TO SET
(4) Screen adjustment starts with Full Black screen.
Original Window screen will be presented about 5-6
seconds later. And if there is a mark of OK OSD, then the
Auto Cut-off and Min-Bias adjustment will be completed.
(5) Pass to the next MAX Bias Adjustment after Adjustment.
[
Once the module is replaced the voltage must be adjusted.
4. MAX Bias Adjustment
(1) Input Full White (255 Gray) signal which generated from
Pattern Generator into CVBS and RGB1 Input part.
(2) Press POWER ON KEY on R/C for adjustment and select
MAX-BIAS
(3) Press Vol. + key and operate TO SET
(4) Original Full White screen will be presented about 1~2
seconds later.
(5) After adjustment, press key to save adjustment and
come out of the adjustment mode.
O You can check whether circuit adjustment is operated well or
not, as below.
(1) Display RGB1 to the Main picture, CVBS to the Sub
picture in the TWIN PICTURE.
(2) To check the MIN-Bias, input Full Black (0 gray) signal into
CVBS and RGB1 input part at the same time in the Pattern
Generator.
(3) To check the MAX-Bias, input Full White (255 gray) signal
into CVBS and RGB1 input part at the same time in the
Pattern Generator.
(4) Compare Black Level with White Level by eyes. And if
there is no Level difference, the adjustment is completed
well.
O
Data value, which adjusted in the board, is valid until the VSC
Board is dissued and must be protected. For the protection of
data, Micom does not permit any more adjustment after
completion.
O
In case of re-adjustment, operate First Value Setting.
Each PCB Assy must be checked by Check JIG Set before
assembly. (Especially, be careful Power PCB Assy which can
cause fatal Damage to PDP Module.)
5. POWER PCB Assy Voltage
Adjustment
(Va, Vs Voltage Adjustment)
5-1 Test Equipment :
D.M.M 1EA
5-2 Connection Diagram for Measuring
Refer to Fig 1.
5-3 Adjustment Method
(1) Va Adjustment
1) After receiving 100% white pattern, HEAT RUN.
2) C terminal of D.M.M to Va pin of P805 and
connect – terminal to GND pin of P805.
3) After turning the VR4, voltage of D.M.M adjustment as
same as Va voltage which on label of panel Right/Top.
(Deviation : ±0.5V)
ADJUSTMENT INSTRUCTIONS
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