FlashGuard 2000B Troubleshooting Guide
Page 10
Power Supply Isolation Test
Leave the seven conductor strobe cable disconnected from the power supply at terminal block
TB2. Install a jumper wire between terminals 5 and 6 to simulate the interlock switch being
depressed. Install a neon lamp (Radio Shack catalog # 272-1102, Honeywell Part # 77-2342)
across the trigger output. For the FG2000B, install the neon lamp in terminals 3 and 4 on TB2.
Apply power to the system and insure the following:
Voltage Measurements
Using a voltmeter, measure the voltages of the conductors to ground terminal 7. Check the
measurements in both day and night modes, and compare to the expected values:
FG 2000B Measurements
#1, Red: +500 VDC to ground
#5, Gray: 120 VAC to ground
#2, Brown: -500 VDC to ground
#6, White: 120 VAC to ground
If either the red or the brown conductor do not have +500 VDC or -500 VDC respectively, there
is most likely a problem in the T1 transformer, the high voltage board, or a capacitor has failed.
Check the input and output voltage of the transformer. Check the high voltage board for bad
diodes. Check each capacitor for the proper value. If your meter will not measure capacitance
(Farads) then check the capacitors for opens or shorts.
Observe Neon Lamp
The neon lamp should be flashing at 40 flashes per minute. With the power supply in day
mode, you should see one quick flash. When the system is put into night mode, you should see
short ‘bursts’ of flashes.
If the neon tube will never flash, you most likely have a problem with the trigger board. Check
the dip switch settings with those in the manual, and replace the board if necessary.
If the neon tube flashes slowly, you most likely have a problem with the sync board. Check the
dip switch settings with those in the manual, and replace the board if necessary.
If the neon lamp is flashing correctly, and the voltages are correct, the power supply is probably
working, and the problem is likely in the flashhead or the strobe cable.
Remove neon lamp & jumper from TB2 before reconnecting the flashhead.
