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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 (
MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2 )
130V 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 132.0V ± 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.
TPD8
TPD9
C552 (+) side
IC551 Pin3
D554 Cathode
C572 (+) side
Adjust Picture Menu for normalized video adjustments.
珍惜眼前人 搜集整理
Chassis Service Adjustment Procedures
Figure 22. A-Board Main Components and Test Points
).
LOCATION
VOLTAGE
24.0V ± 2V
13.0V ± 2V
20.0V ± 2V
9.0V ± 0.5V
200V ± 15V
5.0V ± 0.25V
) — Tuner shield, IC451's heat sink or FA2.
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. Using a high voltage meter confirm that the High
Voltage at the CRT anode is 27.70kV ± 1.25kV.
4. Normalize picture settings.
DVD Voltage Check
Play a DVD TEST DISC and measure the following:
JJ1 pin1 - P2 pin1 (TPJJ5)
JJ1 pin3 - P2 pin3 (TPJJ10)
JJ1 pin5 - P2 pin5 (TPJJ6)
JJ1 pin6 - P2 pin6 (TPJJ7)
W6 pin2 - P1 pin7 (TPW7)
W6 pin4 - P1 pin4 (TPW6)
W6 pin6 - P1 pin6 (TPW5)
W6 pin8 - P1 pin8 (TPW3)
W6 pin10 - P1 pin10 (TPW4)
- 17 -
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LOCATION
VOLTAGE
-10.5V ± 0.52V
10.5V ± 0 . 5 2 V
5.0V ± 0.25V
5.0V ± 0.25V
2.5V ± 0.125V
2.5V ± 0.125V
5.0V ± 0.25V
9.0V ± 0.45V
5.0V ± 0.25V
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