Toshiba RAS-13YKV-E HOW to Diagnose the Trouble, First Confirmation, Confirmation of Power Supply

10. HOW TO DIAGNOSE THE TROUBLE

The pulse modulating circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles according to the trouble diagnosis proce- dure 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	40
2	Primary Judgment	41
3	Judgment by Flashing LED of Indoor Unit	42
4	Self-Diagnosis by Service Check Remote	43
	Controller
5	Judgment of Trouble by Every Symptom	46
6	How to Check Simply the Main Parts	53

NOTE :

Alarge-capacity electrolytic capacitor is used in the outdoor unit controller (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 electri- cal 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 resis- tance (approx. 100Ω 40W) or plug of the solder- ing iron to voltage between + – terminals of the C14 (“CAUTION HIGH VOLTAGE 320V” is indicated.) electrolytic capacitor (500µF/400V) on P.C. board, and then perform discharging.

Inverter cover

MCC-808

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

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 220–230–240 ± 10%. If power voltage is not in this range, the unit may not operate normally.

– 40 –