TROUBLESHOOTING
5-16
VersaPulse Select Service Manual
0621-499-01 12/95
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These fault conditions can be informational, clearable, or permanent.
Informational faults notify the user of some detected abnormal condition that is not significant enough
to interfere with system operation. An advisory message is displayed on the touch screen and the system
continues to operate.
Clearable faults interrupt system operation and force the system to STANDBY, but have the potential to
be cleared by some user action. Some clearable faults include messages to indicate an action required by
the user, e.g., "ATTACH FIBER" appears on the touch screen if there is no fiber attached. Other clearable
faults advise of some detected abnormal condition, but require no further action by the user other than
selecting READY to clear the error. Finally, the coolant conductivity and overtemperature errors will not
clear until that parameter falls back into acceptable limits. The user can't clear these faults directly. Note
that a clearable fault will return if the condition that caused it occurs again or is still active.
Permanent faults place the system in a safe, nonfiring condition that can not be cleared without re-starting
the system. Restarting the system will clear the fault, but if the detected condition is still present, the fault
will occur again.
Some faults are ignored in service mode to aid in troubleshooting. Some faults are only checked during the self
test sequence that occurs at start up. Such faults are so identified in the description of the fault.
Begin by getting a detailed understanding of the symptoms. For example, does the fault appear during self testing
or during normal operation; Does the fault occur only when firing; Only at certain energy or pulse settings; is the
fault easily repeatable or is it intermittent? It is always worthwhile to check for proper mains input, proper
transformer tapping, proper DC voltage supply outputs, and to perform a careful visual inspection for loose
connections and visual indications of problems.
The following list defines the fault codes and provides troubleshooting information for each. The two characters
in parentheses following the bold text is the hexadecimal number that appears on the CPU PCB display when the
fault occurs. Clearable faults are cleared by pressing seleting READY.
F1 - ADC REMAINS BUSY TOO LONG - The CPU PCB analog to digital convertor (U20) or its associated
circuitry is malfunctioning. Check DC voltages, connections to the CPU PCB. If problem persists, change the CPU
PCB.
F2 - UART DETECTED BREAK CONDITION - The CPU PCB main processor UART (U29) is detecting an
abnormal condition on at least one of its receive ports. The display and remote control receive and transmit data
to the Main Processor UART. This could be a problem with the CPU PCB, Remote Control, or Display.
F3/4 - DIGITAL I/O FAILURE - The main processor digital I/O is malfunctioning (F3 is U43, F4 is U44).
F5 - CAP VOLTS WRONG - The output of main processor DAC U10 is used as the charge level command to the
HVPS. The main processor writes a digital value to the DAC, then checks the DAC output through its ADC circuit
to insure that the DAC output is correct. If not, this error occurs. If this error persists, change out the CPU PCB.
If another lamp fires out of sequence due to noise the cap will not have the correct charge. This error will (or may)
occur. Check the trigger board for ground line and diode modifications. The white wire on the J53 connector may
have to be removed.
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