Adjustment Procedure And Factory Settings - Panasonic TX-28PK25 Service Manual

ADJUSTMENT PROCEDURE
Item / Preparation
+B SET-UP
1. Receive a Greyscale signal.
2. Set the controls :-
Brightness Minimum
Contrast Minimum
Volume Minimum
CUT OFF / Ug2 Test
1. Receive a Greyscale signal.
2. Degauss the tube externally.
3. Set the TV into Service Mode 1.
4. Select Cut off mode.
FACTORY SETTINGS
Self-check is used to automatically check the bus lines and hexadecimal code of the TV set. To get in to Self-Check mode
press the down (-/v) button on the customer controls at the front of the TV set, at the same time pressing the STATUS button
on the remote control.
To exit Self Check, switch off the TV set at the power button.
If the CCU ports have been checked and found to be incorrect or not located then " - - " will appear in place of "O.K.".
VPC O.K. PCB
SRC O.K. CAB
DDP O.K.
TUN O.K.
E2 O.K.
MSP O.K.
DPL - -
TX- 28PK25
OPTION1 00
OPTION2 A1
OPTION3 02
OPTION4 C0
OPTION5 B1
OPTION6 E1
4
Adjustments
1. Set the +B voltage up as follows:-
Adjust R811 so that B2 shows 148V±1V.
2. Confirm the following voltages.
B9 5 ± 0,25V B10
B5 12 ± 0,5V
B4 15 ± 1V
B12 26 ± 2V
B3 36 ± 1,5V
B1 205 ± 10V
To adjust Cutoff connect an oscilloscope to the Blue
cathode. Press "STR" and adjust "cutoff" value using the
"Yellow" and "Blue" buttons until the black level is 160V±5V,
press "STR" to store the value. Remove the oscilloscope.
Select Ug2 adjustment and adjust the screen VR until the
display shows "O.K."
O.K.
O.K.
5 ± 0,25V
B11 33 ± 1,5V
B7 8 ± 0,5V
B8 6 ± 1V
B13 13 ± 1V
B14 14 ± 1V