How To Diagnose Trouble In Outdoor Unit - Toshiba RAS-M10UKCV-E Service Manual

10-7. How to Diagnose Trouble in Outdoor Unit

10-7-1. Summarized Inner Diagnosis of Inverter Assembly
Diagnosis/Process flowchart
Remove
connector of
compressor.
NG
Check 25A fuse
(Part No.F01).
OK
Check
NG
15A fuse
(Part No.F03).
OK
Check
NG
terminal voltage
of electrolytic
capacitor.
OK
NO
Does outdoor
fan rotate?
YES
Does LED on control
board flash or go on?
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
Preparation
Check
Replace fuse.
Check
electrolytic
capacitor, diode
Check
block, etc.
Replace control
board assembly.
Check
electrolytic
capacitor, diode
block, etc.
Operation
Measurement
YES
NO
Check
OK
Check
Measurement
B C
Item Contents
Turn "OFF" the power breaker,
and remove 3P connector
which connects inverter and
compressor.
• Check whether 25A fuse on
the control board assembly
is blown or not. (F01)
Check whether 15A fuse on
the control board assembly
is blown or not. (F03)
• 15A fuse (F03) on the
control board is provided for
power factor improvement
control circuit. The operation
continues even if fuse is
blown.
Turn on power breaker, and
operate the air conditioner in
COOL mode by short-circuit of
the timer.
Measure terminal voltage of
the electrolytic capacity.
500µF:400WV x 4
After operation, turn off the
power breaker after 2 minutes
20 seconds passed, and
Stop discharge the electrolytic
capacity by soldering iron.
Check voltage between motor
phases.
• Is not winding between
R R S
, - , or
or short-circuited?
• Is not frame grounded with
Q R S
, , or
– 63 –
If fuse was blown, be sure to
check the electrolytic
capacitor and diode block.
(DB01)
• Connect discharge
resistance (approx.
100Ω40W) or soldering
iron (plug) between +, –
terminals of the electro-
lytic capacitor (500µF) of
C15 (with printed CAU-
TION HIGH VOLTAGE) on
P.C. board.
Discharging position
(Discharging period
10 seconds or more)
If 15A fuse is blown,
discharge both edges of
the electrolytic capacitor
with soldering iron.
OK if 500µF → → → → → DC280V
Remove CN300 while
pushing the part indicated
by an arrow.
Q
-
Q S
→ → → → → Resistance between
- opened
phases should be approx.
55 to 77Ω.
?
→ → → → → Should be 10MΩ or more.
Summary
Plug of
soldering
iron