Rotel RDV-985, Техническое руководство

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Is the AC
wave detected on
the anode side of
D953?
Does the
oscillation wave
come out to
IC901"3"?
P.STAND-BY
indicating lamp
lights up?
Connect to outlet.
Press POWER switch.
STANDBY
indicating lamp
goes out?
A
Check S867
(power switch)
and the line
to IC714.
F901
fuse is blown
Does FL
light up?
Correct
voltage applied at each
lead
of FL?
Correct voltage
applied to IC831
(FL driver)?
Replace
F901.
Voltage of
IC953"1" at
approx.5.6V?
Oscillating
wave output from
IC831"20"?
Voltage
of IC831"13"
(P.ON RESET)
at +5V?
Check
IC831,R843
and C833.
B
Is connection
between IC831"13"
and IC714"76" OK?
Repair the wiring.
Voltage
of CN831"19"
at +5V?
Replace IC831.
Voltage
of IC953"3"
at 5 V?
Replace
IC953.
Continuity
OK between IC953"3"
and IC714"16",
"62" and "99"?
Is IC953
hot?
to
Micro-
computer
Volume.
to Power Supply
Volume.
To Microcomputer
Volume.
Repair the
wiring.
NO YES
NO
NO
YES
YES
NO
YES
YES
YES
YES
NO
NO
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"-"16" and
IC714"2" to "4" OK?
To Microcomputer
Volume.
to Power Supply
Volume.
to
Micro-
computer
Volume.
Return to A
and recheck.
Replace
D901.
Return to A
and recheck.
Replace
IC901.
Return to A
and recheck.
NO
Replace
D953.
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.
Return to A
and recheck.
Repair the
wiring.
YES
NO
YES
Troubleshooting
1.Power-on processing
Does the
DC voltage(input
AC 1.4V) come out to
D901 output side
Is energizing
of "cathode of D953"
and "pin1 of IC953"
normal?
Connecting wires
to the soldered
part of the pins of
T902(transformer)
and anode of T902
is examined.
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