HOW to Diagnose the Trouble | Toshiba RAS-13UKV-E2, RAS-13UAV-E2

FILE NO. SVM-03008

10. HOW TO DIAGNOSE THE TROUBLE

The pulse modulating circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles according to the diagnosis procedure as described below. (Refer to the check points in servicing written on the wiring diagrams attached to the indoor/outdoor units.)

Table 10-1

No.	Troubleshooting Procedure	Page

1	First Confirmation	52

2	Primary Judgment	53

3	Judgment by Flashing LED	54
	of Indoor Unit

4	Self-Diagnosis by Remote Control	55

5	Judgment of Trouble by	58
	Every Symptom

6	How to Check Simply the Main Parts	66

NOTE:

A large-capacity electrolytic capacitor is used in the outdoor unit control (inverter). Therefore, if the power supply is turned off, charge (charging voltage DC280V) remains and discharging takes a lot of time. After turning off the power source, if touching the charging section before discharging, an electrical shock may be caused. Discharge the electrolytic capacitor completely by using soldering iron, etc.

<Discharging method>

(1)Remove the inverter cover (plating) by opening four mounting claws.

(2)As shown below, connect the discharge resistance (approx. 100Ω 40W) or plug of the soldering iron to voltage between + – terminals of the C14

(“CAUTION HIGH VOLTAGE 380 V” is indicated.) electrolytic capacitor (500∝ F/400 V) on P.C. board, and then perform discharging.

		Inverter cover
Discharging position	Plug of	P. C. board
Discharging position	soldering	(Soldered surface)
(Discharging period	soldering	(Soldered surface)
(Discharging period	iron
10 seconds or more)	iron
10 seconds or more)

10-1. First Confirmation

10-1-1. Confirmation of power supply

Confirm that the power breaker operates (ON) normally.

Fig. 10-1

10-1-2. Confirmation of power voltage

Confirm that power voltage is AC 220-240 V ± 10%. If power voltage is not in this range, the unit may not operate normally.

– 52 –

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Toshiba RAS-13UKV-E2, RAS-13UAV-E2 service manual HOW to Diagnose the Trouble, First Confirmation

Models: RAS-13UAV-E2 RAS-13UKV-E2