Toshiba RAS-10SAX, RAS-10SKX, RAS-10SK-E, RAS-10SA-E service manual Checking procedure Table

(3) Checking procedure

Table 9-4-1

No.	Procedure	Check Point (Symptom)						Causes
1	Shut off the power supply and	1. Is the fuse blown?					1. * Application of shock voltage.
	remove the PC board assembly						* Overload by short-circuit of the
	from the electronic parts base.							parts.
	Remove the connecting cable from
	the terminal block.
2	Remove the connector for the	Voltage check					1. * AC power cord is defective.
	motor, and turn the power on.	1. Between		and			* Poor contact of the terminal plate.
			TP1		TP2
	If the OPERATION lamp flashes	(220/230/240V AC)					* Miss wiring of the power relay.
	(0.5 sec. :ON, 0.5 sec. :OFF) when	2. Between		and pin 1 of CN04			2. Fuse is defective.
			TP2
	the power turning on, the checking	(220/230/240V AC)					3. Operation of the thermal fuse.
	points described as 1-5 of right
		3. Between	TP2	and pin 3 of CN04			4. * Capacitor (C01, C15) is defective.
	column are not necessary to
		(220/230/240V AC)					* Line filter (L01) is defective.
	perform.
		4. Between + and - of C02					* Resistor (R01) is defective.
		(310 ~ 340V DC)					* Diode (DB01) is defective.
		5. Between	35V	and	GND		5. IC01, IC02, T01 are defective.
		6. Between	12V	and	GND		6. IC01, IC02, T01, F03 are defective.
		7. Between	5 V	and	GND		7. IC01, IC02, T01, F02, Q29, IC03
							are defective.
3	Make the operation status by	Voltage check					1. Breaking wire of the relay coil,
	pushing once the START/STOP	1. Voltage of relay coil. (DC 12V)					defective relay driver. (IC31)
	button, except the status of [FAN	Between pin 10 of IC31 and					2. Poor contact of relay.
						GND
	ONLY], [ON TIMER].	Between pin 11 of IC31 and
						GND
		2. Between No. 1 and 2 of connecting
		cable terminal block.
		(220/230/240V AC)
4	Start the operation with the system	1. All indicators light for 3 sec..					⎫	Defective indicator, or poor
	which the time of the restart delay	2. Indicators do not indicate normally					⎬
								housing assembly. (CN13)
	timer is shortened.	after approximate 3 sec..					⎭
5	Make the operation status by pressing	1. Compressor does not operate.					1. The temperature of the indoor heat
	once the START/STOP button.	2. OPERATION lamp flashes.					exchanger is abnomally lower.
	1. The time of the restart delay timer						2. Poor contact of the heat exchanger
	is shortened.						sensor. (The connector is
	2. Cool operation						disconnected.) (CN01)
	3. Air volume [AUTO]						3. Heat exchanger sensor, main PC
							board are defective.
	4. Make the setting temperature lower
							(Refer to Table 9-4-2 for the judgment
	enough than room temperature.
							of defective resistance values.)
	5. Continuous operation.
							4. Main PC board is defective.
6	The status of No. 5 is continued,	1. Compressor does not operate.					1. The temperature of the heat
	and make the following condition.	2. OPERATION lamp flashes.					exchanger is abnormally high.
	1. Heat operation						2. The heat exchanger sensor
	2. Make the setting temperature						connector has short-circuit. (CN01)
							3. The heat exchanger sensor is
	higher enough than room
	temperature.						defective.
							(Refer to Table 9-4-2 for the judgment
							of defective resistance values.)
							4. PC board is defective.
7	Turn the power on after connecting	1. The voltage of DC 35V is not					1. Indoor fan motor is defective.
	the motor connector.	measured between the red and					(Protecting operation on the PC
	Start the operation with the following	black of the motor terminals.					board.)
	condition.	2. Motor does not rotate.					2. Poor contact of the motor
	1. Operation [Cooling]	(The key operation is accepted.)					connector.
	2. Airflow [High fan]	3. The motor rotates, but it vibrates					3. PC board is defective.
	3. Continuous operation	too much.

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