Toshiba RAS-07YKX Service Manual page 43

(3) Checking procedure
No. Procedure
1 Shut off the power supply and
remove the P.C. board assembly from
the electronic parts base.
Remove the connecting cable from
the terminal block.
2 Remove the connector for the motor,
and turn the power on.
If the OPERATION lamp blinks (0.5
sec. : ON, 0.5 sec. :OFF) when the
power turning on, the checking points
described as 1-5 of right column are
not necessary to perform.
3
Make the operation status by pushing
once the START/STOP button,
except the status of [FAN ONLY],
[ON TIMER].
4 Start the operation with the system
which the time of the restart delay
timer is shortened.
5 Make the operation status by
pressing once the START/STOP
button.
1. The time of the restart delay timer
is shortened.
2. Cool operation
3. Air volume [AUTO]
4. Make the setting temperature
lower enough than room
temperature.
5. Continuous operation.
6 The status of No. 5 is continued, and
make the following condition.
1. Heat operation
2. Make the setting temperature
higher enough than room
temperature.
7
Turn the power on after connecting
the motor connector.
Start the operation with the following
condition.
1. Operation [Cooling]
2. Airflow [High fan]
3. Continuous operation
for odel RAS-07YKX-T, RAS-10YKX-T
**
Table 9-4-1
Check Point (Symptom)
1. Is the fuse blown?
Voltage check
1. Between  TP1 and  TP2
**
(AC 220–240V) (AC 220V)
2. Between + and – of C02
(DC 310 ~ 340V)
3. Between  12V and  GND
4. Between  5 V and  GND
Voltage check
1. Voltage of relay coil. (DC 12V)
Between pin 10 of IC31 and 
Between pin 11 of IC31 and 
2. Between No. 1 and 2 of connecting
cable terminal block.
(AC 220–240V) (AC 220V) **
1. All indicators light for 3 sec..
2. Indicators do not indicate normally
after approximate 3 sec..
1. Compressor does not operate.
2. OPERATION lamp blinks.
1. Compressor does not operate.
2. OPERATION lamp blinks.
1. Motor does not rotate.
(The key operation is accepted.)
2. The motor rotates, but it vibrates too
much.
– 43 –
Causes
1. • Application of shock voltage.
• Overload by short-circuit of the parts.
1. • AC power cord is defective.
• Poor contact of the terminal plate.
• Miss wiring of the power relay.
2. • Capacitor (C01, C15) is defective.
• Line filter (L01) is defective.
• Resistor (R01) is defective.
• Diode (DB01) is defective.
3. Q01, IC02, T01, F03 are defective.
4. Q01, IC02, T01, F02, Q29, IC03 are defective.
1. Breaking wire of the relay coil, defective relay
driver. (IC31)
2. Poor contact of relay.
GNDI
GNDI
ü
Defective indicator, or poor housing
ý
þ assembly. (CN13)
1. The temperature of the indoor heat exchanger
is abnomally lower.
2. Poor contact of the heat exchanger sensor.
(The connector is disconnected.) (CN01)
3. Heat exchanger sensor, main P .C. board are
defective. (Refer to Table 9-4-2 for the
judgment of defective resistance values.)
4. Main P.C. board is defective.
1. The temperature of the heat exchanger is
abnormally high.
2. The heat exchanger sensor connector has
short-circuit. (CN01)
3. The heat exchanger sensor is defective.
(Refer to Table 9-4-2 for the judgment of
defective resistance values.)
4. P .C. board is defective.
1. Poor contact of the motor connector.
2. P .C. board is defective.