How To Check Simply The Main Parts; How To Check The P.c. Board (Indoor Unit) - Toshiba RAS-B10N3KV2-E Service Manual

Diagnosis/Process flowchart
A
Replace control
board assembly.
Check
NG
compressor
winding
resistance.
OK
Replace
control board.

11-8. How to Check Simply the Main Parts

11-8-1. 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 discoloration 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, Indoor fan motor control circuit, CPU and peripheral circuits,
buzzer, and Driving circuit of louver.
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.
Item
Check
B
Operation
Replace
compressor.
Contents
Check winding resistance
between phases of compres-
sor, and resistance between
outdoor frames by using a
tester.
• Is not grounded.
• Is not short-circuited
between windings.
• Winding is not opened.
Remove connector CN300 of
the outdoor fan motor, turn
on the power supply breaker,
and perform the operation.
(Stops though activation is
prompted.)
Check operation within 2
minutes 20 seconds after
activation stopped.
– –
77
FILE NO. SVM-12050
Summary
→ OK if 10MΩ or more

→ OK if 0.51Ω → 0.57Ω


(Check by a digital tester.)