Diagnosis/Process flowchart
Item
Preparation
Check
Check
Operation
Measure-
ment
Check
Stop
Check
Measure-
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.
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
Q
-
R
‚
R
-
S
, or
Q
-
S
opened
or short-circuited?
• Is not frame grounded with
Q
,
R
, or
S
?
Summary
If fuse was blown, be sure to
check the electrolytic
capacitor and diode block.
(DB01)
• Connect discharge
resistance (approx. 100
Ω
,
40W) or soldering iron
(plug) b, –
terminals of the electro-
lytic capacitor (760
µ
F) of
C07 (with
printed
WARNING ELECTRIC
SHOCK
)
on P.C. board.
OK
if 760µF → DC280 to 380V
Remove CN31 while
pushing
the part indicated by an
by an arrow because CN31
is a connector with lock.
→
Resistance between
phases should be
approx.
16
to
51
Ω
→
Should be 1
0
0M
Ω
or
more.
Replace
outdoor
fan motor.
Remove connector
of compressor.
NG
NG
NG
NO
OK
OK
OK
YES
Check 25A fuse
(Part No.F01).
Does outdoor
fan rotate?
Replace fuse.
Check
electrolytic
capacitor, diode
block (DB01),
etc.
Check
electrolytic
capacitor, diode
(DB01),
etc.
Remove connector
CN31 of outdoor fan
motor, and using a
tester, check resistance
value between every
phases at motor side.
Check
terminal voltage
of electrolytic
capacitor.
B
A
760
µ
F:400V x 2
(RAS-16
, 18
)
FILE NO. SVM-19001
- 100 -
