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Troubleshooting
Troubleshooting Guides
6-8
Model 48i Trace Level-Enhanced Instruction Manual
Malfunction
Alarm - AGC intensity
Alarm - Motor Speed
Alarm – Scrubber Gas Conc.
Alarm – Scrubber Eff.
Alarm – Scrubber Test Done
Alarm - CO Conc.
Alarm - Zero Check
Alarm - Span Check
Alarm - Zero Autocal
Alarm - Span Autocal
Alarm - Motherboard Status
Alarm - Interface Status
Alarm - I/O Exp Status
Possible Cause
Pre-amp Gain not set
properly
Defective measurement
interface board
Defective measurement
interface board
Defective chopper motor or
cable
Test gas not good
System leak
Scrubber failure
System leak
Test did not complete
Concentration has exceeded
range limit
Concentration low
Instrument out of calibration
Internal cables not
connected properly
Board is defective
Action
Check Gain adjustment.
Replace measurement
interface board.
Replace measurement
interface board.
Check chopper motor cable.
Replace chopper motor.
Check test gas cylinder is
attached correctly and not
empty.
Check gas supplier is
working properly.
Check test gas concentration
is within set limits.
Perform a leak test, as
described in the
"Preventive
Maintenance" chapter.
Replace/recharge the
scrubber.
Perform a leak test, as
described in the
"Preventive
Maintenance" chapter.
Rerun test.
Check test gas concentration
(See Sscrubber Gas Conc.
Alarm).
Check to insure range
corresponds with expected
value. If not select proper
range.
Check user-defined low set
point, set to zero.
Recalibrate instrument.
Check gas supply. Perform
manual calibration.
Check that all internal cables
are connected properly.
Recycle AC power to
instrument. If still alarming,
change board.
Thermo Fisher Scientific
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Troubleshooting
