maintenance/
troubleshooting
414
Synrad Firestar f-Series operator’s manual
Troubleshooting
RF Drive Switch fault
An RF Drive DC fault occurs on power-up when the tube fails to breakdown or a fault occurs in the RF
Driver’s 96-volt switching circuitry. In this case, the Ready LED ashes 3 blinks. If an RF Drive DC fault
occurs, reset the laser by removing DC power to the laser, wait 30 seconds, and then reapply power. On
Keyswitch-equipped lasers, you must also toggle the Keyswitch from OFF/RESET to ON (or apply a ±5–24
VDC Remote Reset/Start Request pulse with the Keyswitch set to ON) When the Ready LED illumi-
nates, lasing is enabled after a ve-second delay. If the RF Drive DC fault reappears, contact SYNRAD or
a SYNRAD Authorized Distributor.
PWM Drive/RF Oscillation faults
New circuitry on the f-Series RF board has eliminated PWM Drive and RF Oscillation faults. The 4-blink
fault indication no longer exists.
VSWR fault
A VSWR fault indicates an impedance mismatch between the tube and RF Driver and occurs when a
PWM Command signal is rst applied. This fault is annunciated by the Shutter LED ashing continuously
until the fault disappears. If a VSWR fault occurs, the VSWR circuit limits the maximum PWM pulse
length to 12 microseconds (µs). This equates to a 6% maximum duty cycle at a 5 kHz frequency or a 24%
maximum duty cycle at a 20 kHz PWM frequency. When the VSWR fault clears, the laser resumes normal
operation without cycling DC power. If the VSWR fault fails to clear or reappears, contact SYNRAD or a
SYNRAD Authorized Distributor.
The leading causes of VSWR failures are environmental conditions, like cold overnight temperatures
while the laser is o. In cases like this, it may take as long as 60 seconds for tickle to breakdown the tube
and begin normal daily operation.
Other laser faults
Each Symptom listed below describes a particular fault condition. For each Symptom, specic causes and
solutions are described in the Possible Causes section.
Symptom:
■ A remote interlock condition is indicated by the following status LEDs and I/O states:
Remote Interlock LED – Red Interlock Open output – Closed
Temp LED – Green Over Temperature output – Open
Ready LED – O Laser Ready output – Open
Shutter LED – Blue Shutter Open output – Closed
Lase LED – O Laser Active output – Open
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