How To Diagnose Trouble In Outdoor Unit - Toshiba RAS-M13PKVP-E Service Manual

11-9. How to Diagnose Trouble in Outdoor Unit

11-9-1. Summarized Inner Diagnosis of Inverter Assembly
Diagnosis/Process fl owchart
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
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
etc.
Check
(DB01),
etc.
Operation
Measurement Measure terminal voltage of
Check
Stop
OK
Check
Measurement
B
Table 11-9-1
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 conditioner
in COOL mode by time
shortening.
the electrolytic capacity.
760μF:400WV × 3
After operation, turn off the
power breaker after 2 minutes
20 seconds passed, and
discharge the electrolytic
capacitor by soldering iron.
Check voltage between motor
phases.
• Is not winding between a-
b‚ b-c, or a-c opened
or short-circuited?
• Is not frame grounded with
a, b, or c?
– 87 –
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 electrolytic
capacitor (760μF) of C14
(with printed CAUTION
HIGH VOLTAGE) on P.C.
board.
Discharging position
(Discharging period
10 seconds or more)
Plug of
soldering
iron
OK if 760μF →
DC280 to 380V
Remove CN300 while
pushing the part indicated by
an arrow because CN300 is a
connector with lock.
→ Resistance between
phases should be approx.
55 to 77Ω
→ Should be 10MΩ or more.