Toshiba RAS-B10SKVP-E How to Diagnose Trouble in Outdoor Unit, 82, Diagnosis/Process flowchart

11-8. How to Diagnose Trouble in Outdoor Unit

11-8-1. Summarized Inner Diagnosis of Inverter Assembly

Table 11-8-1

Diagnosis/Process flowchart			Item	Contents	Summary
			Preparation	Turn “OFF” the power supply
Remove connector				breaker, and remove 3P
				connector which connects
of compressor.				inverter and compressor.
					If fuse was blown, be sure to
Check 25A fuse		NG	Check	• Check whether 25A fuse	check the electrolytic
(Part No.F01).				on the control board	capacitor and diode block.
	OK			assembly is blown or not.	(DB01)
		Replace fuse.	Check	(F01)	• Connect discharge
					resistance (approx. 100Ω,
		Check			40W) or soldering iron
		electrolytic			(plug) between +, –
		capacitor, diode			terminals of the electrolytic
		block (DB01),			capacitor (500µF) of C14
		etc.
					(with printed CAUTION
					HIGH VOLTAGE) on P.C.
					board.
					Discharging position
Check
		NG			(Discharging period
terminal voltage
					10 seconds or more)	Plug of
of electrolytic
capacitor.						soldering
						iron
	OK	Check
		electrolytic
		capacitor, diode
		(DB01),
		etc.

	Does outdoor					NO		Operation	Turn on the power breaker,
		fan rotate?
			YES						and operate the air condi-
									tioner in COOL mode by time
											OK if 500µF →
									shortening.
											DC280 to 380V
								Measure-	Measure terminal voltage of
								ment	the electrolytic capacity.		Remove CN300 while
											pushing the part indicated
										500µF:400WV × 3	by an arrow because CN300
									After operation, turn off the		is a connector with lock.
					Remove connector			Check
									power breaker after 2
					CN300 of outdoor fan
		NG							minutes 20 seconds passed,
					motor, and using a
				tester, check resistance					and discharge the electrolytic
					value between every			Stop	capacitor by soldering iron.
					phases at motor side.				Check voltage between
							OK		motor phases.
								Check	• Is not winding between Q-
		Replace
								Measure-	R‚ R-S, or Q-Sopened
		outdoor									→ Resistance between
		fan motor.						ment	or short-circuited?
											phases should be
									• Is not frame grounded with		approx. 55 to 77Ω
A									Q, R, or S?
						B					→ Should be 10MΩ or
											more.

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