
B–70115EN/03
6. TROUBLESHOOTING
163
(1)If an alarm is issued to indicate the occurrence of a power supply fault,
check the diagnosis screen to determine which power supply unit
issued that alarm signal. The bit corresponding to the power supply
unit that issued the alarm signal is set to 1.
Unlike conventional power supply units, the power supply unit does not
have a circuit protector. Therefore, a check using the circuit protector
cannot be made.
Diagnosis
screen
7 6 5 4 3 2 1 0 bit
0–L DGN.854 No.8 7654321
16–L, DGN.974 No.8 7654321
16i–L
975 No.16 15 14 13 12 11 10 9
(2)Check the LEDs of the power supply unit that issued the alarm signal.
Fig. 6.4.1 (a) shows the location of the LEDs.
The LED display is extinguished when the power to the
oscillator is turned off after an alarm is issued.
VR VR
13 11
LED1
LED2
Controls for power
supply adjustment
LEDs for laser power
supply alarm display
Fig. 6.4.1 (a) Location of LEDs for laser power supply alarm display
(3)Fig. 6.4.1 (b) shows the types of alarms displayed by the LEDs.
LED1
LED2
DCVVcOHPFVPFIVi
321
DCI
DCI 1 : DC momentary overcur-
rent alarm
DCI 2 : DC peak current alarm
(DC power alarm)
DCI 3 : DC steady current alarm
DCV : DC overvoltage alarm
Vc : DC control power supply
alarm
OH : Power supply overheat
(In case of C6000B, power
supply or matching box
overheat)
RFV : RF overvoltage alarm
RFI : RF overcurrent alarm
Vi : Inverter overvoltage alarm
Fig. 6.4.1 (b) Types of power supply alarms and corresponding LED
positions
6.4
MAJOR FAULTS
6.4.1
Laser Power Supply
Alarm Display