ILS Strobe Lighting Systems
DOC-3400-MNL Rev23.doc
(9/22/2021)
Copyright 2007-2021 ITL, LLC Page 73
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No High Voltage
High*
Voltage
Present?
NO
YES (Problem External to PS)
No
High Voltage
Likely Causes:
1) Flash Head
Cable
2) Flash Head
Damage
Likely Causes:
1) Fuse, F1
2) Shorted Capacitor,
C2A-E, etc.
3) HV Rectifier Board,
PCB2
4) Power Xfmr, T1
No HV Night
Mode
Only?
Remove Power
Wait 30 seconds and verify that all
high Voltage warning lights are off.
Disconnect TB1-1 (Red) and TB1-3
(Blue) (HV to Flash head)
Apply Power
NO
Likely Causes:
1) Burst Resistor(s),
R1A, R1B
2) Night Capacitor.
3) Burst Choke.
YES
* Measure High Voltage using a volt
meter as describe in section above.
Both +500VDC anode and -500VDC
cathode voltages must be present