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AV-32220
HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT
1. HIGH VOLTAGE HOLD DOWN CIRCUIT
After repairing the high voltage hold down circuit shown in Fig. 1.
This circuit shall be checked to operate correctly.
2. CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT
(1) Turn the POWER SW ON.
(2) As shown in Fig.2, set the resistor (between【X】connector【1】&【3】).
(3) Make sure that the screen picture disappears.
(4) Temporarily unplug the power cord.
(5) Remove the resistor (between【X】connector【1】&【3】).
(6) Again plug the power cord, make sure that the normal picture is displayed on the screen.
T901
D922
30
R933
IC701
Q927
Power
ON/OFF
Q922
RY921
C926
D921
Q944
RESISTOR
18.9kΩ Ω Ω Ω ± ± ± ± 94Ω Ω Ω Ω 1/4W
3
D551
R557
R560
D560
Q541
R561
R559
D561
Q542
R558
C551
IC201
H-Vcc
H.OUT
26
32
Q521
B1
C924
Q923
Q924
Fig.1
X CONNECTOR
2
1
R544
D544
R556
C544
Fig.2
No. 51782
CONNECTOR
3
2
1
X
D551
R556
R544
4
D544
R557
C544
T521
Q531
10
9
T522
HV
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