TROUBLESHOOTING
5-17
VersaPulse Select Service Manual
0621-499-01 12/95
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F6 - COOLANT CONDUCTIVITY WRONG - The coolant conductivity is monitored to minimize corrosion
inside the coolant system. If the coolant conductivity is excessive, this fault will occur. This fault may occur if
a system is turned on after being off for an extended period, the water added as coolant is not deionized,
something inside the coolant loop is contaminating the coolant, or the DI filter needs to be replaced. If the fault
occurs at turn on, leave the system on; this allows the DI filter to lower the coolant conductivity. If this fault
persists, change the DI filter.
F7 - COMMUNICATION DATA ERROR - Not implemented in current software.
F8 - CPU ERROR - The Main Processor has failed. Check the DC supply voltages. If the fault persists, change
out the CPU PCB.
F9 - INCORRECT ECHO OF TRANSMITTED CHARACTER - Not implemented in current software.
F10 - E1 AND E2 DISAGREE - After a fire pulse, the voltage signals from the two energy monitor circuits E1 and
E2 are different. When properly calibrated, both circuits will output ≈ x VDC/joule of energy. Check the energy
monitor calibration. The two signals can be seen on an oscilloscope at CPU PCB test points (TP2 TP3). Both
pyrodetectors are located on the Single Solenoid PCB. The samples are picked off the main beam path (2.22V/
Joule) by a wedge optic, then directed to the pyrodetector surface through an imaging mirror.
F11 - ERROR PROCESSOR ERROR - The error processor is actually a software routine. If this error persists
change out the CPU PCB.
F12 - SPURIOUS FIRE PULSE INTERRUPT - A fire pulse interrupt has occurred when none was expected. This
does not indicate that any laser energy has been produced, but just that the fire pulse signal as read by the main
processor interrupt circuit has seen the /FIREPULSE/ line go active. If this problem persists, replace the CPU
PCB.
F13 - UART DETECTED FRAMING ERROR - 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.
F14 - HVPS ERROR - The HVPS has reported one of its three faults to the CPU PCB. The three faults are
temperature overload, current overload, or no charge reversal.
F15 - MAIN PROGRAM DEAD - This fault indicates a problem on the CPU PCB. Swap out EPROMs.
F16 - NEGATIVE 12 VDC WRONG - Check/adjust the -12 VDC.
F17 - NONEXISTENT ERROR CODE - Change out the CPU PCB if this fault persists.
F18 - UART DETECTED OVERRUN ERROR - The CPU PCB main processor UART (U29) is detecting an
abnormal condition on at least one of its receive ports. The touch screen and remote control receive and transmit
data to the Main Processor UART. This could be a problem with the CPU PCB, remote control, or touch screen.
F19 - POSITIVE 5 VDC WRONG - Check/adjust the 5 VDC.
F20 - UART DETECTED PARITY ERROR - The CPU PCB main processor UART (U29) is detecting an abnormal
condition on at least one of its receive ports. The touch screen and remote control receive and transmit data to
the main processor UART. This could be a problem with the CPU PCB, remote control, or touch screen.
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