Toshiba RAS-M10U2MUVG-E Service Manual page 58

(3) Check procedures
N . o P o r c e
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 (compressor) operates
continuously in the above
condition.)
6 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.)
d u e r
Check whether or not the fuse (F01)
is blown.
Check power supply voltage :
1. Between No. 1 and No. 3 of CN67
(AC 220–240V)
2. Between
(DC 310–340V)
3. Between 12V and GND
4. Between 5V and GND
Check power supply voltage :
1. Between No.1 and No.3 of CN67
(DC 15–60V)
Check whether or not all indicators
(OPERATION, TIMER, PRE. DEF, Hi
POWER) are lit for 3 seconds and
they return to normal 3 seconds later.
1. Check whether or not the
compressor operates.
2. Check whether or not the
OPERATION indicator flashes.
1. Check it is impossible to detect the
voltage (DC15V) between No.4
and No.5 of the motor terminals.
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.
Table 10-6-1
C h e c k p o n i s t
and of CN08
– 58 –
C a u s e s
Impulse 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) Varistor (R01),
line filter (L01), resistor (R03,R04), or
the diode (DB01) is defective.
3. T01 is defective.
4. IC01,IC02 and T01 are defective.
IC08 and IC09 are defective.
The indicators are defective or the
housing assembly (CN214) is defective.
1. The temperature of the indoor heat
exchanger is extremely low.
2. The connection of the heat exchanger
sensor is loose.
(The connector is disconnected.)
(CN101,CN102)
3. The heat exchanger sensor and the
P.C. board are defective.
(Refer to Table 10-4-1.)
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.