Instruction Manual
IM-105-4000, Rev 1.3
October 2008
OPM 4000
http://www.raihome.com
Section 8
Troubleshooting
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8-1
TROUBLESHOOTING
Removing covers from the optical assembly or making optical repairs or adjustments in an
unsuitable environment can affect the accuracy of the unit. Removal of the electronics
housing and optical cover, as well as all repairs and adjustments to the optical assembly,
must be performed in a clean, dust-free environment.
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.
(Figure 2-12).
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
R/M signal processor board
is lower than 9.3V
Adjust lamp drive PT-2 on the
power/modulator board until
reference voltage TP-2 on
R/M signal processor board is
10.0 Volts.
Main lamp out
Replace main lamp
assembly. Refer to "Lamp
Replacement" in Section 7:
Maintenance.
Control unit reads high opacity,
zero/span values are OK.
Smoke
Correct process.
Alignment is out
Adjust alignment until
centered on target. Refer to
"Beam Alignment Procedure"
in Section 2: Installation.
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 reflector. 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.
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