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Troubleshooting
Troubleshooting Guides
6-4
Model 146i Instruction Manual
Table 6-1. Troubleshooting - General Guide, continued
Malfunction
Possible Cause
Permeation oven fails
Oven not ON
to warm up
Not enough time has elapsed since
turning oven ON
Loose cable/connections
Oven heater defective
Control circuit malfunction
Temperature display
Flow through permeation tube oven
erratic
not constant
Cell frequency high
Light setting too high
Defective detector
Defective photometer board
Defective measurement interface
board
Cell frequency low or
Light setting too low
zero
Contaminated cell
Defective detector
Defective photometer board
Defective measurement interface
board
Cell noise excessive
Contaminated cell
Defective detector
Lamp failure
Pressure transducer
Plumbing leak or bad electrical
does not hold
connection
calibration
Defective pressure transducer
Defective measurement interface
board
Output signal
Defective recorder
noisy
Sample is varying
Action
Turn oven ON.
Wait one hour from
powering up instrument.
Check cable/connections.
Replace oven.
Replace measurement
interface board (see
"Servicing" chapter).
Clean capillary, readjust
regulator (see "Preventive
Maintenance" chapter).
Lower lamp setting (Service
Mode > Lamp Setting).
Replace detector module.
Replace photometer board.
Replace measurement
interface board.
Raise lamp setting (Service
Mode > Lamp Setting).
Clean cell.
Replace detector module.
Replace photometer board.
Replace measurement
interface board.
Clean cell.
Replace detector module.
Replace lamp.
Check plumbing and
electrical connections.
Replace pressure transducer.
Replace measurement
interface board.
Replace or repair recorder.
Run instrument on stable
ozone source, if quiet, no
malfunction.
Thermo Fisher Scientific
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Troubleshooting
