Panasonic CT-27D10B - Chassis Service Adjustment Procedures; High Voltage Check Procedure

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Chassis Service Adjustment Procedures
All service adjustments are factory preset and should not require adjustment unless controls and/or
associated components are replaced.
Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use IC803’s heat sink when the HOT ground
symbol ( ) is used. Otherwise, use COLD ground ( ) — Tuner shield, IC451’s heat sink or FA2.
MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2 )
131.0V B+ Voltage Confirmation
1. Set the Bright and the Picture to Minimum by
using the Picture Menu.
2. Connect the DVM between C809(+ side) and cold
ground ( ).
3. Confirm that B+ voltage is 131.0V ± 2.5V. This
voltage supplies B+ to the Horizontal Output &
Flyback circuits.
Source Voltage Chart
120V AC line input. Set the Bright and the Picture to
Minimum by using the Picture Menu. Use cold ground
( ) for the (-) lead of the DVM.
Adjust Picture Menu for normalized video adjustments.
High Voltage Check
1. Select an active TV channel and confirm that
horizontal is in sync.
2. Adjust Brightness and Picture using Picture Icon
menu so video just disappears.
3. Confirm B+ 131V is within limit.
4. Using a high voltage meter confirm that the High
Voltage is 28.30kV ± 1.25kV.
T
U
N
E
R
IC 551
IC 101
IC 001
IC 002
D554
IC 803
IC451
FOCUS SCREEN
F801
HOT ( )
COLD ( )
FA1
DATA
TP15
CLK
FA2
IC 552
SP
RL801
TP
T
U
N
E
R
IC 2361
IC 6501
IC 2302
Q 501
IC 003
Q 551
IC 3001
Figure 4. A-Board Main Components
TPD9
TPD8
C552
LOCATION VOLTAGE
TPD8 27.4V ± 2V
TPD9 13.0V ± 2V
C552 (+) side 8.0V ± 1V
IC551 Pin3 9.0V ± 0.5V
D554 Cathode 220V ± 15V
C572 (+) side 5.0V ± 0.25V