
B–70115EN/03
6. TROUBLESHOOTING
154
Leakage of gas tube/anomaly of exhaust pump
(Refer to DGN = 905 [860])
When the RUN (pressure control start) button is pressed, the exhaust
pump starts operating and expels gas from the gas circulating system
to cause a low–pressure condition. This alarm is displayed, if the
pressure is not reduced to the level specified in parameter No. 15240
[0235] within 10 minutes from the start of discharging.
No. Cause of trouble Solution
1 Incorrect gas pressure
control parameter setting
Check if the value of PRM No. 15240 [0235]
is set as indicated in the attached data
sheets. If a different value is set, set the
value specified in the data sheets.
2 Anomaly of IF PCB
For FS0–L:
A16B–1110–0223
For FS16–L, 16i–L:
A16B–2100–0080
A16B–1110–0260
Unit specification:
A02B–0128–C202
A16B–2100–0141
If the gas pressure of the gas circulating
system does not decrease at all, the IF PCB
may be faulty. Check whether the CP89
connector on the PCB is loose. Also check
the signals of the IF PCB. If an abnormal
signal is detected, replace the IF PCB.
3 Gas leakage from piping 1) Check whether any component joints in
the gas circulating system are loose. If
a loose joint is found, tighten the joint
firmly.
2) Check whether any components in the
gas circulating system are cracked. If a
cracked component is found, replace
that component.
3) Check whether the O–ring of each dis-
charge tube is worn. Replace any O–
rings that exhibit excessive wear. If a
Teflon O–ring is ever removed, it must
be replaced with a new one.
4) Check whether there is a hole or crack
in a discharge tube. If a hole is found in
a discharge tube, replace the discharge
tube.
4 Anomaly of exhaust
pump
If the above checks do not reveal any ab-
normality, the performance of the exhaust
pump has deteriorated. Check the following
items.
1) The oil level is too low.
Supply oil as explained in Chapter 5.
2) Other than the approved type of oil is
being used.
Supply the approved type of oil as ex-
plained in Chapter 5.
3) The exhaust filter is clogged.
Replace the exhaust filter as explained
in Chapter 5.
4) The exhaust pump outlet is locked or
clogged to disable exhaust operation.
Remove the cause of the locking or
clogging.
5) If the steps above do not clear the fault,
replace the exhaust pump.
Alarm No. 4080 [680]