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Airport Systems
SG-60 High Intensity Strobe System 4-4 Manual EPM-00000019 Rev A
Flashhead does not
flash
Press DB SW1
pushbutton 1 sec
and release.
Yes
No
Power Supply Failure:
Replace Digital Board.
Is THVB DS1
High Voltage
Indicator Lit?
Is DB DS1 red
LED (+5V
Indicator) lit?
Yes
No
Do DB DS2
(yellow) and DS3
(green) blink twice
together?
Yes
Yes
Is FH Flashtube
broken?
Replace Flashtube.
No
No
Microcontroller Failure.
Replace Digital Board.
Remove Power at
Breakers. Discharge
Capacitors.
Is FH capacitor
C1A, C1B, C2,
C3, or C4 shorted
out?
Yes
Replace capacitor. If THVB
DS1 High Voltage Indicator
still does not light, or system
flashes erratically, replace FH
T1 Transformer.
This test assumes that F1
and F2 have tested OK.
Select Manual Day
Mode from FH Switch
panel. Apply power to
Flashhead.
Yes
Does K3 Relay
pull in at power
on?
No
Check to see if problem is resolved
after each step:
1. Check K3 fast-on connectors.
2. Replace Digital Board.
3. Replace K3 Relay.
Check FH resistor pack R2-R4 (stack
closest to door). Replace if visually
damaged.
No
Rectification Failure:
Replace Trigger/High-
Voltage Board
Check to see if problem is resolved
after each step.
1. Replace Trigger/HV Card
2. Replace Digital Card
3. Replace Flashtube.
4. Replace Trigger Transformer
Once problem is resolved, try
restoring (one at a time),
components replaced in previous
steps.
Figure 4-2: General Troubleshooting – Flashhead Does Not Flash