JANDS DD-8 DMX SPLITTER
Revision 2.0 - 5 July 1998
OPERATING MANUAL
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5.2
Fault Finding Table
Fault Symptom
Possible Cause
Remedy
No power indication
Blown Fuse
Mains disconnected
Ambient temperature too high
Replace fuse
Reconnect
Reduce ambient temperature
No DMX signal indication
Input cable fault
DMX source fault
Replace cable
Repair source
No DMX output - One output
Faulty output cabling
Faulty receiving equipment
Control channels incorrect
Ambient temperature too high
Faulty DD-8 output
Replace cable
Replace faulty receiver
Check source patch settings
Check receiver address settings
Reduce ambient temperature
Swap cabling to another output
No DMX output - All outputs
Faulty input cabling
DMX source fault
Ambient temperature too high
Control channels incorrect
Replace cable
Repair source
Reduce ambient temperature
Check source patch settings
Check receiver address settings
5.3
Miscellaneous Notes
•
The protection circuitry will protect the DD-8 DMX line receiver/drivers
against damage from most faults. However it is possible that extremely high
fault voltages or spikes may damage the circuitry. If damage does occur it is
important to re-route or repair the DMX cables as appropriate before re-
powering the unit. Note that the protection circuitry may take up to a minute to
reset after a fault has occurred.
•
The internal linear power supplies are protected from faults by polyswitches.
These devices become more sensitive to overload at elevated temperatures, and
when tripped the unit should be switched off to enable them to reset. Allow one
minute for these devices to reset once the power has been removed.
•
The DD-8 must be connected to a 3-pin earthed power source. Use of two pin
power sources will reduce the ability of the DD-8 to protect against high
voltage shield faults.
