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NOTE 1. Forced
When
ON
BEFORE
STARTING ofelectrol~ic
REPAIR capacitor ofpower
relay circuit cordis
discharge
is going
supply
block
supply Ifrepair block, electric potential is kept charged seconda~ across defect
repair
to be attempted (CIOl,
in the set that though
uses
in the power removed.
theelectrolytic can occur. In order
capacitors
102)even
ACpower
isattempted
inthiscondition,
to prevent
the secondary
trouble,
perform
the following
measures
before
starting
repair
work
Discharge
procedure
I II
Remove Connect has clips wire the AC power a discharging at both ends. cord. resistor Connect at an end the other of lead end wire that of the lead to metal the chassis. other end (+VH) of the discharging (For two resistor seconds) as step @ same way. to the
MAIN
C.B
Contact positive Contact
(+) side the same
of C101.
end of the discharging (-) side (-VH) of C102
resistor in the
to the negative (For Check
to
two
seconds) voltage using across C101 and C102 has decreased (
I
that
1 V or less
a multimeter
or an oscilloscope.
@
@
Select
Charging
a discharging
voltage
resistor
(V)
referring
Discharging
to the following
table.
Fig-1
Rated
power
(W)
Parts
number
(Clol,
25-48
102)
resistor
(Q)
100 220 numbers (C101, C102) of the
3 5 electrolytic on schematic capacitors diagram
87-AOO-247-090 87-AOO-232-090 can before change starting depending on the models. work. Be sure to check the
49-140
Note:
The
reference
reference
numbers
of the charging
capacitors
the discharging
2.
Check
items
before
the following
exchanging
items before
the
MICROCOMPUTER
the MICROCOMPUTER. Exchange the MICROCOMPUTER after confirming
Be sure to check that
exchanging
the MICROCOMPUTER
is surely
defective.
2-1.
Regarding
When When terminal When
the
HOLD
terminal is �L�,
terminal
(INPUT) the main
of the
MICROCOMPUTER
is �H�, on. the MICROCOMPUTER be sure to check is judged the terminal to be operating voltage correctly.
the HOLD this terminal
of the MICROCOMPUTER power cannot be turned
Therefore,
of the HOLD
before
exchange. is not the abnormality defective, detection the HOLD circuit terminal can also go �L� when the POWER terminal AMPLIFIER to �L�. has any
the MICROCOMPUTER that triggers
abnormalities
on the MAIN
C. B. that
sets the HOLD
q
Good @
@ @
or no good
judgement
power. power
of the
MICROCOMPUTER
Turn
on the AC main that the main the
Confirm When
is turned is �L�
on and the HOLD the abnormality
terminal
of the MICROCOMPUTER circuit is judged to be
keeps working
the �H�
level
or not. and the
HOLD
terminal
level,
detection
correctly
MICROCOMPUTER
is judged
to be good.
.�. �.� c.B .�. �.�
�.�.�.
FRONT C.B � IYAIN
i
MICROCOMPUTER PIN101 @� ~ �, CON601
In some
models,
it is PIN
@.
OVER ~
LOAD
DET
.
.
I
PIN �.�
dnumber is different upon microprocessor. .�. �-
I
I
PI
QIIO I ~~
AC DET
POWER
SUPP �LY I
depending
]
.�..
Fig-2-l
�5�
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