Toshiba A90-0132, Service Manual

Page: 111 / 176

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14
Troubleshooting
Diagnostic procedure for check code
( *1) Oil tank peripheral circuit leakage/blockage check procedure
1. After resetting the power supply, start a trial operation.
2. Set SW01/SW02/SW03 on interface PC board to 1/16/1, respectively.
3. Check the 7 segment display of the interface PC board.
7 segment display
When operation has started “OL” “- - “
During detection of oil level “OL” “FF” or “Numerical”
Judgement result of oil level “OL” “AO” “A1” or “A4”
In case of judgment result “A0” “A1” Oil level is adequate. Resume the operation.
In case of judgment result “A4” Possibility of oil tank circuit leakage/blockage is considered.
Check the following items.
4. Start a trial operation, confirm that AC220V–240V-power is on
to SV3C valve.
5. After operation for several minutes check the temperature at
the secondary side of SV3C (A.)
When temperature is high (equivalent to discharge
temperature at (B)), valve is not blocked.
If blocked part is found, replace the part.
6. During operation, check whether leakage occurs in the check
valve (two positions) of pipe connecting the oil tank and
compressor case. Check temperature either side of (C).
If leakage is found, replace the part.
Oil
separator
Sensor TK1
SV3C
Valve
strainer
Check joint
Capillary
Strainer
Accumulator
Check
joint
Capillary
Strainer
Sensor
TK2
Compressor
Valve
SV3A
Oil tank
Check
valve
Check
valve
Oil
removal
valve
Valve
SV3B
Check
valve
Balancing pipe valve
Strainer
Strainer
• •
(A) (B)
Strainer