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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 (
Figure 4.
A-Board Main
Components and
Test Points
MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2 )
132.0V 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 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.
LOCATION
TPD8
TPD9
C552 (+) side
IC551 Pin3
D554 Cathode
C572 (+) side
) — Tuner shield, IC451's heat sink or FA2.
IC6501
IC551
C572
-
IC001
IC2302
T
IC101
U
N
E
R
TP
8
1
/
VOLTAGE
24.0V ± 2V
13.0V ± 2V
8.0V ± 1V
9.0V ± 0.5V
200V ± 15V
5.0V ± 0.25V
A-BOARD
IC451
C809
-
IC803
TPD8
C552
-
S
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 27.7kV ± 1.25kV.
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TPD9
Q551