How To Diagnose Trouble In Outdoor Unit - Toshiba RAS-10NKV-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 15A 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
Does LED on control
board flash or go on?
NO
Remove connector
CN300 of outdoor fan
NG motor, and using a
tester, check
resistance value
between every phase
at motor side
OK
Replace
outdoor
fan motor.
A B
Item
Preparation
Check
Check
electrolytic
etc.
Check
electrolytic
(DB01), etc.
Operation
Measurement
YES
Check
Stop
Check
Measurement
C
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)
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.
760mF: 400WV x 3
After operation, turn off
the power breaker after 2
minutes 20 seconds
passed, and discharge
the electrolytic capacity
by soldering iron. Check
voltage between motor
phases.
• Is not winding
between 1-2, 2-3,
or 1-3 opened or
short-circuited?
• Is not frame grounded
with 1, 2 or 3?
– 56 –
FILE NO. SVM-05026
Summary
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 (760µF)
of C12 (with printed
CAUTION HIGH VOLT-
AGE) on P.C. board.
Discharging position
Plug of
(Discharging period
soldering
10 seconds or more)
iron
If 15A fuse is blown,
discharge both edges
of the electrolytic
capacitor with
soldering iron.
OK if 760µF →
DC280 to 320V
Remove CN300 by
pushing the part
(an arrow indication)
because CN01 is a
connector with lock.
→ Resistance between
phases should be
approx. 55 to 77Ω
→ Should be 10MΩ or
more