JVC XV-1000BK, Service Manual

Page: 51 / 80

Troubleshooting
1.Power-on processing
P.STAND-BY
indicating lamp
lights up?
Connect to outlet.
Press POWER switch.
STANDBY
indicating lamp
goes out?
A
Check S843
(power switch)
and the line
to IC601.
F001
(500mA) fuse
is blown.
Does FL
light up?
Correct
voltage applied at each
lead
of FL?
Correct voltage
applied to IC831
(FL driver)?
Replace
F001.
Voltage of
IC901"1" at
approx. 12V?
Oscillating
wave output from
IC831"20"?
Voltage
of IC831"13"
(P.ON RESET)
at +5V?
Check
IC831,R044
and C834.
B
Is connection
between IC831"20"
and IC601"5" OK?
Repair the wiring.
Voltage
of CN831"19"
at +5V?
Replace IC831.
AC wave
supplied to
T901"12" to "15"
(transformer)
?
Check the soldered
part of the pins of
T901 (transformer)
and the thermal fuse
between "5" and "6".
Voltage
of IC901"3"
at 5 V?
Check the
wiring
between
D902 or
transformer
to IC901"3".
Replace
IC901.
Continuity
OK between IC901"3"
and IC601"73"?
Is IC901
hot?
to
Micro-
computer
Volume.
to Power Supply
Volume.
To Microcomputer
Volume.
Repair the
wiring.
NO YES
NO
NO
YES
YES
NO
YES
NO
NO
YES
OK
NG
YES
NO
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO NO
YES
NO
Power-on
processing is OK.
To Microcomputer Volume.
Is connection
of IC831"14"-"15" and
IC601"2" to "4" OK?
To Microcomputer
Volume.
to Power Supply
Volume.
to
Micro-
computer
Volume.
Return to A
and recheck.
Return to A
and recheck.
Return to A
and recheck.
Return to A
and recheck.
Return to A
and recheck.
Return to B
and recheck.
Return to B
and recheck.
Return to B
and recheck.
Does
the lamp
goes out when
POWER switch of
remote control
box is turned
ON?
Repair the
wiring.
YES
NO
YES