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FILE NO. SVM-05010
<Inspection procedure>
(1) If the P.C. board is detective, check for
disconnection, burn or discoloration of the copper
foil pattern of the P.C. board.
(2) The P.C. board consists of the following 2 parts:
a. Main P.C. board parts:
Power relay, indoor fan motor drive circuit and
control circuit, C.P.U. and peripheral circuits, buzzer
drive circuit and buzzer.
b. Infrared rays parts:
Infrared rays receiving circuit
Check the defects of the P.C. board with Table 9-8-1.
Table 9-8-1 Inspection procedure
No.
Procedure
Check points
Causes
1
Turn off the power supply and
remove the P.C. board assembly from
electric parts base. Remove the
connecting cables from the terminal
block.
2
Remove the connector of the motor
and turn on the power supply. If
OPERATION lamp blinks (once per
second), it is not neccessary to check
steps (1 to 4) in the right next
column.
3
Press [START/STOP] button once to
start the unit. (Do not set the mode to
Fan Only or On-Timer operation.)
4
Shorten the line of the restart delay
timer and start unit.
Impluse voltage was applied or the
indoor fan motor short-circuited.
1. The terminal block or the crossover
cable is connected wrongly.
2. The capacitor (C01 and C02), line
filter (L01), resistor (R319),
or the diode (DB01) is defective.
3. M01, DB01, R319 and C63
are defective.
4. IC04 is defective.
1. The wire of the relay coil (RY03)
comes down or the relay drive
(Q25) is defective.
2. CN27 or RY03 is connected
wrongly.
The lamps are defective or the
housing assembly (CN13) is defective.
Check whenther or not the fuse (F01) is
blown.
Check power supply voltage;
1. Between TP01 and CN31
(AC 220V)
2. B and – of C63
(DC310 – 340V)
3. Between 12V and GND
4.Between 5V and GND
Check power supply voltage;
1. Between connector of Q25 and GND
(for relay coil (DC12V))
2. Between
1
and
2
of terminal block
for connecting cable
Check whether or not all lamps
(OPERATION, TIMER, FAN ONLY, ECO
and AUTO) are indicated for 3 seconds
and
9-8. Troubleshooting for P.C. Board
9-8-1. How to check indoor P.C. board
<Cautions for handling P.C. board>
(1) When removing the front panel and the P.C. board,
be sure to turn off the power supply.
(2) When removing the P.C. board, hold the edge of
the P.C. board and do not apply force to the parts.
(3) When connecting or disconnecting the connectors
on the P.C. board, hold the housing. Do not pull at
lead wires.
Summary of Contents for 38CJR018-723
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