Toshiba RAS-10YKV-E How to Check Simply the Main Parts, How to Check the P.C. Board Indoor Unit

Diagnosis/Process flowchart

Item

Contents

Summary

Check

Check winding resistance

A

B

C

between phases of compres-

sor, and resistance between

outdoor frames by using a

tester.

→

OK if 10MΩ or more

Check

NG

•

Is not grounded.

winding of

•

Is not short-circuited



→ OK if 0,51Ω → 0,57Ω

compressor.

between windings.



OK

• Winding is not opened.



(Check by a digital tester.)

Check

NG

Replace

Operation

Remove connector CN300 of

fan motor

com-

the outdoor fan motor, turn

position

pressor.

detect

on the power breaker, and

signal.

perform the operation.

OK

(Stops though activation is

prompted.)

Replace

Check operation within 2

outdoor

minutes 20 seconds after

fan

activation stopped.

motor.

Check

<Output check of fan motor

a) One or two of three

Replace control

position detect signal>

voltages should be 5V,

While connecting connector

and others should be 0V.

board assembly.

5P (CN301) for position

(When all are 0V or 5V, it

detection, using a tester,

is not accepted.)

Check

measure voltage between Q

b) When rotating the fan

NG

- U. Between U - T : 5V

slowly with hands, the

compressor

winding

voltage between pins

resistance.

should move from 0V to

OK

5V.

(Check it with an analog

Replace

Replace

tester.)

control board.

compressor.

10-8. How to Check Simply the Main Parts

10-8-1. How to Check the P.C. Board (Indoor Unit)

(1)Operating precautions

1)When removing the front panel or the P.C. board, be sure to shut off the power supply breaker.

2)When removing the P.C. board, hold the edge of the P.C. board and do not apply force to the parts.

3)When connecting or disconnecting the connectors on the P.C. board, hold the whole housing. Do not pull at the lead wire.

(2)Inspection procedures

1)When a P.C. board is judged to be defective, check for disconnection, burning, or discol- oration of the copper foil pattern or this P.C. board.

2)The P.C. board consists of the following 2 parts

a.Main P.C. board part:

DC power supply circuit (5V, 12V, 35V), Indoor fan motor control circuit, CPU and peripheral circuits, buzzer, and Driving circuit of top/bottom louvers

b.Indication unit of infrared ray receiving Infrared ray receiving circuit, LED:

To check defect of the P.C. board, follow the procedure described below.

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