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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 IC801's heat sink when the HOT ground
symbol (
) is used. Otherwise, use COLD ground (
Q551
140.0V B+ Voltage Confirmation
1. Set the Bright, Picture and Color to Minimum by
using the Picture Menu.
2. Connect the DVM between C849, + side (A-Board)
and cold ground (
).
3. Confirm that B+ voltage is 140.0V ± 1.5V. 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 (
Hot ( ) ground for the (-) lead of the DVM as needed.
IC451
DY
COLD GND (
)
T801
HOT GND (
)
F801
) or
) — Tuner shield, IC451's heat sink or FA2(TP-3).(See Fig. 8)
A11
C6501
COMB FILTER
IC6501
Q451
TPA146
IC882
C849
C563
C837
D841
TPD76
IC891
TPA143
TPD72
C038
LOCATION
(A-Board)
TPD72
C837 (+)
TPA143
TPD76
TPA146
C6501 (+)
C038 (+)
Set all adjustments to normal level.
- 18 -
TP
1
8
T
U
N
E
R
MPU
IC001
VOLTAGE
± 2 V DC
24
± 2 V DC
13.0
±1 V DC
9.0
± 0.5 V DC
12.0
± 0.25 V DC
5.0
± 0.25 V DC
5.0
± 0.1 V DC
3.3
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