Panasonic CT-25G6UE Manual de serviço - Página 10
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Chassis Service Adjustment Procedures
All service adjustments are factory preset and should
not
require
adjustment
associated components are replaced.
Figure 4. A-Board Main
Components and Test Points
(Components within dotted
areas are located on
trace side)
MOMENTARILY CONNECT A JUMPER TO ENTER SERVICE MODE (FA1 to FA2)
130.0V B+ Voltage Confirmation
1. Set the Bright and the Contrast to Minimum by
using the Picture Menu.
2. Connect the DVM between C825 (+ side) or
TPD14 and cold ground (
3. Confirm that B+ voltage is 130.0V ± 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.
LOCATION
TPD8
TPD9
IC551 Pin3
IC552 Pin3
D554 Cathode
unless
controls
and/or
).
VOLTAGE
26.0V ± 2.0V
13.0V ± 2.0V
9.0V ± 0.25V
5.0V ± 0.25V
220V ± 15V
Note:
Connect the (-) lead of the voltmeter to the
appropriate ground. Use IC801's heat sink
when the HOT ground symbol ( ) is used.
Otherwise, use COLD ground (
shield, IC451's heat sink or FA2.
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 Contrast 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 29.25kV ± 1.25kV.
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