
B–70115EN/03
6. TROUBLESHOOTING
156
Anomaly of pressure sensor (Refer to DGN = 905 [860]
This alarm appears when the signal of the pressure sensor used for
pressure control detector vanishes.
No. Cause of trouble Solution
1 Disconnected cable be-
tween pressure sensor
and IF PCB
Check the cable connection. If the connec-
tion is abnormal, remake the connection.
2 Disconnected cable be-
tween oscillator IF PCB
and CNC IF PCB
Check the cable connection. If the connec-
tion is abnormal, remake the connection.
3 Anomaly of IF PCB If a signal is received from the pressure
sensor, but there is no output from the IF
PCB, the IF PCB is faulty. Replace the IF
PCB.
4 Anomaly of CNC IF PCB
A16B–1212–0270
If a signal is detected at the input terminal
(cable side) of the CNC IF PCB, but the
CNC monitor detects no signal, the CNC IF
PCB is faulty. Replace the CNC IF PCB.
5 Anomaly of pressure sen-
sor
If the power supply ("15 V) for the pressure
sensor is normal, but there is no output, the
pressure sensor is faulty. Replace the pres-
sure sensor.
Oscillator IF PCB specification:
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
Shutter failure to open
This alarm occurs when the shutter does not reach the correct position
at a certain time (pre–flow time of assist gas) after the shutter open
command.
This alarm takes place in the following cases.
No. Cause of trouble Solution
1 The pre–flow time of as-
sist gas is too short for
the shutter to open.
Adjust the pre–flow time on setting screen.
It should be longer than 0.6 sec.
2 Movable part caught Replace the shutter unit.
3 When beam output was
specified, an alarm was
issued.
Check the cause of the alarm, then take ap-
propriate action.
Alarm No. 4082 [682]
Alarm No. 4083 [683]