172
EN 3340.758.003a - 2014-11
TROUBLESHOOTING
MM9000 Rev C.8 01/13
Page 172
MM9000 ClearCommand User Manual
Troubleshooting
10.10 Problems Without Error Codes
In addition to the Error Codes listed above, some problems may not necessarily generate Error Codes. The
following give some examples where the Processor may not detect a fault, though the operation may not be
perfect:
10.10.1 Basic Control System Problems Without Error Codes
A
SYMPTOM:
No audible tones heard at one Control Station when power is first applied to the
Processor. All other features function normally.
B
SYMPTOM:
The Control Head’s red LED doesn’t light when in command, but otherwise
functions properly.
C
SYMPTOM:
When power is turned ON to the Processor, there are no tones from any of the
Remote Stations, the Control Head red LED does not light when the Transfer Button is
pressed, and the Display is not lit at the Processor
.
Cause
Remedy
a.
Incorrectly wired Station Harness/ Cable
or Pigtail.
a.
Verify that the black wire is properly connected to pin 1 on the
Control Head and Pin 8 at the Processor.
b.
The Control Head’s Sound Transducer is
defective.
b.
Measure the AC voltage at pins 1 & 3 of the Control Head. If 20-
25 VAC is present, replace the Control Head.
Cause
Remedy
a.
Incorrectly wired Station Harness/ Cable
or Pigtail.
a.
Verify that the brown wire is properly connected to pin 2 on the
Control head and pin 2 at the Processor.
b.
The Control Head’s red LED or circuit is
open.
b.
Measure the DC voltage at pins 2 & 3 at the Control. The
measurement will be approximately 2.20 VDC when the red LED
is lit. If 4.00 VDC is measured, the red LED or its circuit is open.
Replace the Control Head.
Cause
Remedy
a.
No power to the Processor.
a.
Disconnect the Power Harness from the Processor. Measure the
DC voltage at pins 10 (+) and 11 (-) of the Harness plug. If 12 or
24 VDC is not present, check the circuit breakers, switches and
cables feeding power to the Processor. Correct the power source
as required.
b.
The battery’s polarity is reversed at the
Processor.
b.
Disconnect the Power Harness from the Processor. Connect a
voltmeter’s red lead to pin 10 and the black lead to pin 11 of the
Harness’s plug. If negative voltage is measured, reverse the
wires.
c.
Defective Processor.
c.
If Causes a. and b. were not the fault, replace the Processor.
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