maintenance/
troubleshooting
4
15
Synrad
Firestar i401
operator’s manual
Troubleshooting
DC Pre-Charge fault
A DC Pre-Charge fault indicates that 48 VDC is not available on the input of one or more RF modules
and causes the
RDY
LED to flash 5 blinks. Reset the laser by removing DC power to the laser, wait 30
seconds, and then reapply power. When the
RDY
LED illuminates, lasing is enabled after a five-second
delay. If the DC Pre-Charge fault reappears, the laser requires service—contact SYNRAD or a SYNRAD
Authorized Distributor.
No-Strike condition
When a No-Strike condition occurs, lasing is limited to a maximum 5% duty cycle (at a PWM Command
frequency of 5 kHz). This fault is annunciated by the
SHT
indicator flashing continuously and an error
message appears on the i401’s web page. To clear the No-Strike condition, apply tickle pulses or a PWM
Command signal (< 5% duty cycle) for 30 to 60 seconds. When the gas breaks down into a plasma state,
the laser will recover and begin lasing at the commanded power level without cycling DC power. If the
No-Strike condition persists, contact SYNRAD or a SYNRAD Authorized Distributor.
Common causes of No-Strike (gas breakdown) issues are environmental conditions–like cold overnight
temperatures when the laser is powered down. In situations like this, it may take 30 to 60 seconds for gas
breakdown to occur so the laser can begin normal daily operation.
General laser fault conditions
Each Symptom listed below describes a particular fault condition. For each Symptom, specific causes and
solutions are described in the Possible Causes section.
Warning
serious
personal
injury
On Firestar i401 OEM lasers, remote interlock faults are not latched.
Clearing the fault condition re-enables the
RDY
indicator and the la-
ser will fire after the five-second delay provided the
SHT
indicator is
lit and a PWM Command signal is applied. Because exposure to 10.6
µm CO
2
laser radiation can inflict severe corneal injuries and seri-
ously burn human tissue, the OEM or System Integrator must ensure
that appropriate safeguards are in place to prevent unintended lasing.
Symptom:
■
A remote interlock condition is indicated by the following status LEDs and I/O states:
INT
LED –
Red
Interlock Open
–
Closed
TMP
LED
– Green
Fault Detected
–
Open
RDY
LED
–
Off
Laser Ready
–
Open
SHT
LED
–
Off
Shutter Open
–
Open
LASE
LED
– Off
Laser Active
– Open
Possible Causes:
■
No voltage is applied to Pin 3 (
Remote Interlock
) of the
User I/O
connector.