Toshiba RAS-B10N3KVP-E - How to Diagnose Trouble in Outdoor Unit

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11-8. How to Diagnose Trouble in Outdoor Unit
11-8-1. Summarized Inner Diagnosis of Inverter Assembly
Table 11-8-1
Diagnosis/Process flowchart Item
Preparation
Check
Check
Operation
Measure-
ment
Check
Stop
Check
Measure-
ment
Contents
Tu r n “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
po
wer breaker after 2
min
utes 20 seconds passed,
and discharge the electro-
lytic capacitor b
y soldering
iron.
Chec
k voltage between
motor phases
.
• Is not winding betw
een
Q
-
R
‚
R
-
S
, or
Q
-
S
opened
or shor
t-circuited?
• Is not fr
ame grounded with
Q
,
R
, or
S
?
Summary
If fuse was blown, be sure to
chec
k the electrolytic
capacitor and diode b
lock.
(DB01)
• Connect discharge
resistance (appro
x. 100
Ω,
40W) or solder
ing iron
(plug) betw
een +,
–
te
rminals of the electro-
lytic
capacitor (500µF
or
760
µF)
of
C14 (with printed
CAU
TION HIGH VOLTAGE)
on
P.C. board.
OK
if 500µF or 760µF →
DC280 to 380V
Remo
ve CN300 while
pushing the par
t indicated
b
y an arrow because CN300
is a connector with loc
k.
→ Resistance betw
een
phases should be
appro
x. 55 to 77
Ω
→ Should be 10MΩ 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
f
an rotate?
Replace fuse
.
Check
electrolytic
capacitor, diode
block (DB01),
etc.
Chec
k
electrolytic
capacitor
, diode
(DB01),
etc.
Remove connector
CN300 of outdoor fan
motor, and using a
tester, check resistance
value between every
phases at motor side.
Check
terminal voltage
of electrolytic
capacitor.
BA
Discharging position
(Discharging period
10 seconds or more)
Plug of
solder
ing
iron
500 µ F:400WV x 3
FILE NO. SVM-12051