Chassis Service Adjustment Procedures; B2+ Voltage Check; Source Voltage Chart; High Voltage Check - Panasonic CT-32HX40B Service Manual

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 Q801's heat sink when the HOT
ground symbol ( ) is used. Otherwise, use COLD ground (
A-BOARD
IC876
IC2301
T
T
U
U
N
N
E
E
R
R
TP
8
MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2)
140.0V B2+ Voltage Check
1. Set the Bright and Picture to Minimum by using
the Picture Menu.
2. Connect the DVM on TPP17 (D-Board) and cold
ground ( ).
3. Confirm that B2+ voltage is 144.0V ± 1.5V. This
voltage supplies B2+ 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.
LOCATION
MAIN 12V (IC876 PIN-2)
A-Board
MAIN 9V (CATHODE D894)
MAIN 5V (IC872 PIN-1)
A-Board
MAIN 3.3V (IC872 PIN-2)
A-Board
GC 3.3V (IC880 PIN-2)
A-Board
STBY 3.3V (IC003 PIN-4)
A-Board
IC880
IC002
+ -
+ -
C892
C874
IC001
IC003
+ -
+
C027
IC872
AG-BOARD +
C879
D007
D008
DG-BOARD
1
VOLTAGE
TPA6 12.0 ± 0.5V
TPA7 9.0V ± 0.5V
A-Board
TPA8 5.0V ± 0.3V
TPA14 3.5V ± 0.2
TPA15 3.5V ± 0.2V
TPA16 3.3 ± 0.2V
) — Tuner shield, IC2301's heat sink (See Fig. 50)
D-BOARD
IC802
Q-BOARD
C878
-
D503
-
LOCATION
STBY 5.0V (IC002 PIN-8)
BTL 30V (CATHODE D007)
+B2 (BY IC802 & Q854)
40V (CATHODE D826)
25V (BY D825)
D-Board
15V (BY C840 & L826)
) or
-15V (BY C838 & C838)
SOUND (BY L827 & L824)
220V (CATHODE D511)

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 B2+ 144 ± 1.5V is within limit.
4. Using a high voltage meter confirm that the High
Voltage is 31.0kV ± 1.0kV.
- 14 -
C840
C838
D825
T801
Q801
Q551
P-BOARD
VOLTAGE
TPA17 5.0 ± 0.2V
A-Board
32.0V ± 2.0V
TPA18
A-Board
TPP17 144.0V ± 1.5V
D-Board
TPP25 40.0V ± 3.0V
D-Board
TPP19 26.8V ± 2.0V
TPP20 15.0V ± 1.5V
D-Board
TPP21 -15.1V ± 1.5V
D-Board
TPP22 32.5V ± 2.0V
D-Board
TPD7 220.0V ± 9.0V
D-Board
L827
L824