Troubleshooting - Mustek Power Must 400 LCD User Manual

Use the table below to solve minor UPS installation or operation
problems. If any abnormal situations occur that are not listed
above,please call service people immediately.
Symptom
No LED display on 1. Missing battery.
the front panel.
2. Battery defect.
3.When the Input cord
isn't electvified and
Power switch is not
pressed.
Alarm buzzer Overload of the UPS.
beeps continuously
when AC supply is
normal.
When power 1. Overload of the UPS.
failure, back-up
time is shorten.
2. Battery voltage is too
low.
3. Battery defect due to
high temperature
operation environment,
or improper operation
to battery.
Communication 1. Software is not
lost between UPS installed well.
and computer.
2. Cable is not properly
connected.
Mains normal but 1. Circuit breaker is
LCD display broken.
Battery mode.
2. Power cord is loose.
Trouble Shooting
Possible Cause
1. Charge battery up to 8
hours.
2. Replace with the same type
of battery.
3. Press the power switch
again or elecerity the Input
cord
Verify that the load matches
the UPS capability specified in
the specs.
1. Remove some noncritical
load.
2. Charge battery 8 hours or
more.
3. Replace with the same type
of battery.
1. Check the setting of the
software .
2. Check the RS-232 or USB
1. Reset the circuit breaker..
2. Reconnect the power cord
properly.
Remedy
cable is firmly connected to
COM1/COM2 of the
computer and confirm the
setting again.