Toshiba 10SAX-1, Service Manual

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No.

1

2

3

4

5

6

7

Procedure

Shut off the power supply and
remove the PC board assembly
from the electronic parts base.
Remove the connecting cable from
the terminal block.

Remove the connector for the
motor, and turn the power on.
If the OPERATION lamp flashes
(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.

Make the operation status by
pushing once the START/STOP
button, except the status of [FAN
ONLY], [ON TIMER].

Start the operation with the system
which the time of the restart delay
timer is shortened.

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.

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.

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

Check Point (Symptom)

1. Is the fuse blown?

Voltage check
1. Between  TP1  and  TP2

(220/230/240V AC)

2. Between  TP2  and pin 1 of CN04

(220/230/240V AC)

3. Between  TP2  and pin 3 of CN04

(220/230/240V AC)

4. B and - of C02

(310 ~ 340V DC)

5. Between  35V  and  GND
6. Between  12V  and  GND
7. Between   5 V  and  GND

Voltage check
1. Voltage of relay coil. (DC 12V)

Between pin 10 of IC31 and  GND
Between pin 11 of IC31 and  GND

2. Between No. 1 and 2 of connecting

cable terminal block.
(220/230/240V AC)

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 flashes.

1. Compressor does not operate.
2. OPERATION lamp flashes.

1. The voltage of DC 35V is not

measured between the red and
black of the motor terminals.

2. Motor does not rotate.

(The key operation is accepted.)

3. The motor rotates, but it vibrates too

much.

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. Fuse is defective.
3. Operation of the thermal fuse.
4. * Capacitor (C01, C15) is defective.

* Line filter (L01) is defective.
* Resistor (R01) is defective.
* Diode (DB01) is defective.

5. IC01, IC02, T01 are defective.
6. IC01, IC02, T01, F03 are defective.
7. IC01, IC02, T01, F02, Q29, IC03

are defective.

1. Breaking wire of the relay coil,

defective relay driver. (IC31)

2. Poor contact of relay.

Defective indicator, or poor
housing 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 PC

board are defective.

(Refer to Table 9-4-2 for the judgment

of defective resistance values.)

4. Main PC 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. PC board is defective.

1. Indoor fan motor is defective.

(Protecting operation on the PC

board.)

2. Poor contact of the motor

connector.

3. PC board is defective.

(3) Checking procedure

Table 9-4-1

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