Toshiba RAS-25N4KVRG-ND Service Manual page 104

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.
capacitor, diode
block (DB01),
Check
NG
terminal voltage
of electrolytic
capacitor.
OK
capacitor, diode
NO
Does outdoor
fan rotate?
YES
Remove connector
CN300 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
electrolytic
etc.
Check
electrolytic
(DB01),
etc.
Operation
Measure-
ment
Check
Stop
OK
Check
Measure-
ment
B
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 not winding between
R R S Q S
‚ - , or - opened
or short-circuited?
• Is not frame grounded with
Q R S
, , or ?
- 104 -
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,C10 (with printed
WARNING ELECTRIC
SHOCK) on P.C. board.
OK
if 760µF → DC280 to 380V
Remove CN300 while pushing
the part indicated by an
by an arrow because CN300 is
a connector with lock.
Q
-
→ Resistance between
phases should be
approx. 33.7Ω
→ Should be 100MΩ or
more.