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Instruction Manual
IM-105-4000, Original Issue
August 2005
8-1
OPM 4000
Section 8 Troubleshooting
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8-1
TROUBLESHOOTING
Problem Possible Cause Remedy
Control unit reads 100%, both
bargraphs are blinking, Alarm
LED is on, fault message T2
4-20 mA lost/low, service
module meter in T2 reads -20
or higher.
Transceiver current loop to
the control unit is open
Operate/test switch must be
in Operate.
Check wiring for open from
Terminal 17 and 18 on control
unit to terminal 17 and 16 at
service module location.
Alignment is good but control
unit reads high opacity or
erratic in normal, zero, and
span mode; service module
meter in opacity reads high or
erratic.
Reference voltage TP-2 on
signal processor is lower
than 9.3V
Adjust lamp drive PT-2 on the
power modulator until
reference voltage TP-2 on
signal processor is 10.0 Volts.
Main lamp out Replace main lamp
assembly.
Control unit reads high,
zero/span values are OK
Smoke Correct process.
Alignment is out Adjust alignment until
centered on target.
High dust alarm and /or cal fail
cal message
Transceiver window and/or
zero mirror is dirty
Clean window and/or zero
mirror.
Control unit reads high,
zero/span values are OK,
alignment is good
Dirt built up in flanges Swing open transceiver and
retro. Clean flanges with push
rod.
Air purge fault message No, or low, air flow Replace air blowers as
necessary.
Replace air filters as
necessary.
Tighten hose clamps as
necessary.
No stack power fault message Service module lost power or
failed
Check power, check SM fuse.
Replace as needed.
Maintenance Mode message Maintenance switch or
maintenance function is on
Return all to operate or
neutral positions and press
ACK key to clear alarms.
Control unit zero/span key
was pressed
Service module zero/operate
switch in zero, span/operate
switch in span
Service module test/operate
switch in test
Control unit blank Control unit fuse open Replace and check for shorts
in the power supply or
individual boards.