Disassembly 5-5
Revision 2 - 26 April, 2000 HP SERIES DIMMER TECHNICAL MANUAL
5.7 Fault finding guide
FAULT SYMPTOM POSSIBLE CAUSE REMEDY
Over-temperature indication Poor intake ventilation
Poor exhaust ventilation
Damaged fan
Ambient temp above 40°C
Use racks with side ventilation
Use racks with side ventilation
Replace fan
Keep ambient temp below 40°C
Breaker trips when channel flashed
to near full
Large incandescent load
Excessive load
Faulty breaker
Use Preheat facility
Reduce channel loading
Factory service
Breaker trips after prolonged
operation
Excessive load
Lamp or wiring fault
Faulty breaker
Reduce channel loading
Check lamps and wiring
Factory service
Breaker trips immediately when
channel is driven
Output short
SCR / Triac short
Check lamps and wiring
Factory service
One channel flickers when dimmed -
Drive LED flickers
DMX source problem Softpatch another desk fader
Fit terminating plug (see Sec
3.3)
Replace desk
One channel flickers when dimmed -
steady Drive LED indication
Faulty channel
Same load flickers on another channel
Factory service
Insufficient load
All channels flicker when dimmed Incorrect DMX protocol / wiring
Mains control tones exceed limits
DMX line unterminated
Replace DMX source / wiring
Contact factory
Fit terminating plug (see Sec
3.3)
Overvoltage cutout activates Faulty wiring / poor neutral
connection
Poor mains supply (or generator)
Check wiring / 3 phase plugs
Disable N.Detect function until
wiring / generator is repaired
One channel is not working Channel disabled
Circuit breaker off
Enable channel (see section 4.3)
Reset circuit breaker
Radio interference Faulty choke Factory service
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