Toshiba RAS-25S4KVDG-ND Service Manual page 113

11-7. How to Diagnose Trouble in Outdoor Unit
11-7-1. Summarized Inner Diagnosis of Inverter Assembly
Diagnosis/Process flowchart
Remove connector
of compressor.
NG
Check 25A fuse
(Part No.F01).
OK
Replace fuse.
electrolytic
capacitor, diode
block (DB01),
Check
NG
terminal voltage
of electrolytic
capacitor.
OK
electrolytic
capacitor, diode
NO
Does outdoor
fan rotate?
YES
Remove connector
CN31 of outdoor fan
NG
motor, and using a
tester, check resistance
value between every
phases at motor side.
Replace
outdoor
fan motor.
A
Item
Preparation
Check
Check
Check
etc.
Check
(DB01),
etc.
Operation
Measure-
ment
Stop
Check
OK
Measure-
B
ment
Contents
Turn "OFF" the power supply
breaker, and remove 3P
connector which connects
inverter and compressor.
• Check whether 25A fuse
on the control board
assembly is blown or not.
(F01)
Turn on the power breaker,
and operate the air condi-
tioner in COOL mode by time
shortening.
Measure terminal voltage of
the electrolytic capacity.
760µF:400V x 2
After operation, turn off the
power breaker after 2 minutes
20 seconds passed, and
discharge the electro-lytic
capacitor by soldering iron.
Check voltage between motor
phases.
Is winding between
1
- or - opened or
2 3 1 3
short-circuit ?
Is frame grounded with
, or ?
1 2 3
- 113 -
Summary
If fuse was blown, be sure to
check the electrolytic
capacitor and diode block.
(DB01)
• Connect discharge
resistance (approx. 100Ω,
40W) or soldering iron
(plug) between +, –
terminals of the electro-
lytic capacitor (760µF) of
C09 (with printed WARNING
ELECTRIC SHOCK) on P.C.
board.
OK
if 760µF → DC280 to 380V
Remove CN31 while
pushing the part indicated
by an arrow because CN31
is a connector with lock.
→
Resistance between
- ,
2
phases should be
approx 18.80Ω.
→ Should be 100MΩ or more.