Toshiba RAS-B10U2FVG-E Service Manual page 85

(3) Check procedures
No. Procedure
1 Turn off the power supply breaker
and remove the P.C. board
assembly from electronic parts
base. Remove the connecting
cables from the terminal block.
2 Remove the connector of the
motor and turn on the power
supply breaker. If OPERATION
indicator flashes (once per
second), it is not necessary to
check steps (1 to 3) in the right
next column.
3 Push [ ] button once
to start the unit. (Do not set the
mode to On-Timer operation.)
4 Shorten the restart delay timer
and start unit.
5 Push [ ] button once
to start the unit,
• Shorten the restart delay timer.
• Set the operation mode to
COOL.
• Set the fan speed level to
AUTO.
• Set the preset temperature
much lower than the room
temperature. (The unit (com-
pressor) operates continuously
in the above condition.)
6 If the above condition (No. 5) still
continues, start the unit in the
following condition.
• Set the operation mode to
HEAT.
• Set the preset temperature
much higher than room tem-
perature.
7 Connect the motor connector to
the motor and turn on the power
supply.
Start the unit the following
condition.
• Set the fan speed level to HIGH.
(The unit (compressor) operates
continuously in the above
condition in No. 5.)
Table 11-8-1
Check points
Check whether or not the fuse (F01)
is blown.
Check power supply voltage :
1. Between CN01 and No. 3 of CN301
(AC 220–240V)
2. Between and of C03
(DC 310–340V)
3. Between of IC122 and output
side of IC122 (DC15V)
4. Between 12V and GND
5. Between 5V and GND
Check power supply voltage :
1. Between CN01 and
CN501 (DC 15–60V)
Check whether or not all indicators
(OPERATION, TIMER, FILTER)
are lit for 3 seconds and they return
to normal 3 seconds later.
1. Check whether or not the com-
pressor operates.
2. Check whether or not the OP-
ERATION indicator flashes.
1. Check whether or not the com-
pressor operates.
2. Check whether or not the OP-
ERATION indicator flashes.
1. Check it is impossible to detect
the voltage (AC120V or higher
voltage) between red and black
lead of the motor.
2. The motor does not operate or
the fan motor does not rotate with
high speed.
(But it is possible to receive the
signal from the remote controller.)
3. The motor rotates but vibrates
strongly.
- 85 -
FILE NO. SVM-18048
Causes
Impulse voltage was applied or the
indoor fan motor short-circuited.
1. The terminal block or the crossover
cable is connected wrongly.
2. The fuse (F01), line filter
(L01), resistor (R02), of the diode
(DB01) is defective.
3. TC122 and T101 are defective.
4. D122, TC124 and T101 are defective
5. IC121,IC124, IC102,D121 and T101
are defective.
IC501 and IC502 are defective.
The indicators are defective or the
housing assembly (CN51) display PCB)
is defective.
1. The temperature of the indoor heat
exchanger is extremely low.
2. The connection of the heat ex-
changer sensor is loose.
(The connector is disconnected.)
(CN602 and CN603)
3. The heat exchanger sensor and the
P .C. board are defective.
(Refer to Table 11-4-1.)
4. The main P.C. board is defective.
1. The temperature of the indoor heat
exchanger is extremely high.
2. The connection of the heat ex-
changer sensor short-circuited.
(CN602 and CN603)
3. The heat exchanger sensor and the
P .C. board are defective.
(Refer to Table 11-4-1.)
4. The main P.C. board is defective
1. The indoor fan motor is defective.
(Protected operation of P.C. board.)
2. The P.C. board is defective.
3. The connection of the motor
connector is loose.