JVC AV-27BM3

e@HOW
TO
CHECK
THE
HIGH
VOLTAGE
HOLD
DOWN
CIRCUIT
1. High voltage hold down circuit
AV-27BM3
AV-27CM3
Alter
repair
of
the
high
voltage
hold
down
circuit
shown
in
Fig,
1,
this
circuit
shal!
be
checked
to
operate
correctly.
@) (a) 7522 FBT
poceeee *
H H
[RAY }
PROTECT. H
Hl
TP-B '
RBSO7 bannenn cf
ehaOe oder iz Dso4 R508
VW WV HEATER
t +
i cs08
ot
Fig. 1
2, Checking method of the high voltage hold down circuit
(1) Mask sure thar the POWER switch is at OFF.
(2) Shown in Fig, 2, set the resistor 15.8kQ 1/4W lo RBSO7 (between TP-A and TP-B).
(3) Tum the POWER switch ON.
(4) Mask sure that the screen picture disappears.
(5) Tuen the POWER switch OFF.
(6) Remove the resistor 15.8k 1/4W from RBSO7 (between TP-A and TP-B).
15.8kQ
TP-A TP-B
fexoy Oso2 D504 R508
C101
FT
(r522
Ragan Hw [FBT (rs22)]
R505 C505 cs08
Fig. 2
(No.50718) 11