Chassis Service Adjustment Procedures - Panasonic CT-27C8G Service Manual

10 Chassis service adjustment procedures
All service adjustments are factory preset and should not
require adjustment unless controls and/or associated
components are replaced.
3 1 3
2 2
10552 1С551 1С005
EL cud 71
A1
| exe exe |ТР1
FA2
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 (Tuner
shield, IC451's heat sink or FA2).
Component and Voltage Test Points
Note:
Components and test points within doted areas are located
on trace side.
B+ voltage check
1.Set the BRIGHT and PICTURE to minimum by using the
PICTURE menu.
2. Connect the DVM between C825 (+ side) ог TPD14 and
cold ground.
3. Confirm that B+ voltage is 131.0V + 2.0V. This voltage
supplies B+ to the horizontal output and flyback circuits.
Source voltage chart
120V AC line input. Set the BRIGHT and the PICTURE to
minimum by using the PICTURE menu. Use cold or hot ground
for the (-) lead of the DVM as needed.
A-BOARD | TEST POINT VOLTAGE
+82 |ТР014 131.0 + 2.0У
SOUND C823 (+) 18.1 = 1.0V
13
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. Using a high voltage meter confirm that the high voltage is
29.25 » 1.25kV.