How To Diagnose Trouble In Outdoor Unit - Toshiba RAS-B10GKVP-E Service Manual

11-7. How to Diagnose Trouble in Outdoor Unit

11-7-1. Summarized Inner Diagnosis of Inverter Assembly
Diagnosis/Process flowchart
Remove
connector of
compressor.
NG
Check 25A fuse
(Part No.F01).
OK
Replace fuse.
capacitor, diode
Check
NG
terminal voltage
of electrolytic
capacitor.
OK
electrolytic
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
phases at motor side.
OK
Replace
outdoor
fan motor.
A B
Tel: 01823 665660
Heronhill - for all your Toshiba requirements
Table 11-7-1
Item
Preparation
Check
Check
Check
electrolytic
block, etc.
Check
block, etc.
Operation
YES
Measure-
ment
Check
Stop
Check
Measure-
C
ment
www.heronhill.co.uk
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.
760µF:400WV × 4
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
‚ ‚ ƒ  ƒ
‚ - , or - opened
or short-circuited?
• Is not frame grounded with
 ‚ ƒ
, , or ?
– 100 –
Summary
If fuse was blown, be sure to
check the electrolytic
capacitor and diode block.
• Connect discharge
resistance (approx. 100Ω,
40W) or soldering iron
(plug) between +, –
terminals of the electro-
lytic capacitor (760µF) of
C14 (with printed CAU-
TION HIGH VOLTAGE) on
P.C. board.
Discharging position
(Discharging period
10 seconds or more)
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. 25 to 55Ω
→ Should be 10MΩ or
more.
Fax: 01823 665807
Plug of
soldering
iron