troubleshooting
7
DNG485 Instruction Manual Rev F.doc
Check the following list. If you are still unable to rectify the situation, contact your nearest Dynalite
office. A complete list of distributors worldwide can be found on the Internet at:
Please ensure that you have completed the following prior to calling
our technical support department:
Check all symptoms in the Troubleshooting list
Check for any deviations between the installation and the installation instructions
Make a list of the model numbers of all devices used in the system
SYMPTOM
PROBABLE CAUSE
ACTION
Device does not operate at
all. No Service LED activity.
Power supply indicator LED
on PCB not lit.
Incorrect connection of
Mains supply, or no power
available.
Check power supply to
DNG485. Check Line and
Neutral input connections.
Check Fuse if fitted.
Power supply indicator LED
lit, but no Service LED
activity.
Supply voltage too low, short
circuit on network or short
circuit on analogue inputs.
Control PCB faulty.
Check 5V & 12V terminal
voltages. Disconnect network
bus and restore power.
Replace control PCB.
Device appears to be
operating but not passing
messages.
Incorrect Dip Switch settings.
Faulty LTC485 Transceiver.
Verify Dip Switch settings.
Replace LTC485
Transceiver.
Device passes messages in
one direction only.
Incorrect Dip Switch settings.
Incorrect software
configuration. Message Pass
Filter incorrectly set.
Verify Dip Switch settings.
Reload device & verify
Message Pass Filter
settings. Re compile event
file.
