I N S T R U C T I O N M A N U A L R E V 4 . 2
46
TROUBLE SHOOTING
Problem
Possible Cause
Remedy
Control unit reads 99%, Alarm icon is on, Fault
message T2 4-20mA FAULT, service module meter in
T2 reads -20 or higher.
Transceiver current loop to the
control unit is open
Service module Operate/test switch must
be in Operate.
Check wiring for open from control unit
AN3 & ACM to terminal 17 & 16 at service
module location.
Alignment is good but control unit reads high opacity
or erratic in normal, zero & span mode, service
module meter in opacity reads high or erratic.
1- Reference voltage TP-2 on
signal processor 1667 is lower
than 9.3V
2- Main lamp out
1- Adjust lamp drive PT-2 on the power
modulator 1668 until Reference voltage TP-
2 on signal processor 1667 is 10.0 +/-
0.2Volts.
2- Replace main lamp assembly
Control unit reads High, zero/span values are OK
1- Smoke
2- Alignment is out
1- Correct process
2- 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 & Retro. Clean
flanges with push rod.
Air purge icon on in the lower right corner of the Main
Display
No 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
