
B–70115EN/03
6. TROUBLESHOOTING
158
Shutter temperature abnormal (Refer to bit 6 of DGN 961 [bit 2 of 841].)
This alarm is issued when the temperature of the shutter mirror
exceeds a preset maximum. The table below lists the causes of faults
and the corresponding countermeasures.
No. Cause of trouble Solution
1 Contamination of shutter mirror Clean or replace the shutter
mirror.
2 Anomaly of temperature sensor Replace the temperature
sensor.
3 Temperature sensor cable broken Replace the cable.
4 Intermediate PCB B (A16B–1600–0361)
is faulty.
For FS0–L:
Oscillator IF PCB (A16B–1110–0223) is
faulty.
CNC IF PCB (A16B–1212–0270) is faulty.
For FS16–L, 16i–L:
A16B–2100–0080, A16B–1110–0260,
A02B–0128–C202 (Unit specification), or
A16B–2100–0141 is faulty.
Replace the faulty PCB.
5 Anomaly of PCB connection cables Check the connection of
each cable.
Discharge tube voltage drop (Refer to DGN 909 [861].)
This alarm is issued, if the voltage applied to the discharge tube drops
largely. More specific, the discharge tube voltage for reference
discharge is set up automatically to parameter No. 15270 [199] each
time the RUN button is pressed. This alarm is issued, if the
automatically set discharge tube voltage is lower than the discharge
voltage specified at the previous RUN time, by at least the amount
specified in parameter No. 15272 [243].
No. Cause of trouble Solution
1 The laser gas composi-
tion is not as specified.
Replace the laser gas with the specified
one, that is CO
2
:N
2
:He = 5:55:40% (volume
ratio) with a composition ratio accuracy of
"5%.
2 Anomaly of discharge
tube voltage detection
system
If discharge is performed, but the monitored
discharge tube voltage is extremely low, re-
place the matching box.
3 Degradation of turbo
blower gas circulating
performance
Check whether the turbo blower and high–
frequency inverter are normal. Replace the
turbo blower or high–frequency inverter if
found to be faulty.
Assist gas not output
(Refer to bits 0 to 2 of DGN F222 [bits 0 to 2 of 173].)
This alarm is issued, if an attempt is made to radiate a laser beam, when
no assist gas is selected, or an assist gas condition is not set up.
Alarm No. 4087 [687]
Alarm No. 4088 [688]
Alarm No. 4089 [689]