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Troubleshooting
Troubleshooting Guides
6-2
Model 48i Trace Level-Enhanced Instruction Manual
Table 6–2
provides troubleshooting information regarding calibration
failures and indicates checks that you should perform if you experience a
calibration problem.
Table 6–3
provides troubleshooting information regarding measurement
failures and indicates checks that you should perform if you experience a
calibration problem.
Table 6–4
Troubleshooting – Alarm Messages lists all the alarm messages
you may see on the display and provides recommendations about how to
resolve the alarm condition.
Table 6–1. Troubleshooting – Power-Up Failures
Malfunction
Does not start
(The light on display does
not come on and the pump
motor is not running.
Display does not come on
(Pump is running)
Possible Cause
No power or wrong power
configuration
Main fuse is blown or
missing
Bad switch or wiring
connection
DC power supply failure
DC power distribution failure
Display failure
Action
Check the line to confirm
that power is available and
that it matches the voltage
and frequency configuration
of the instrument.
Unplug the power cord, open
the fuse drawer on the back
panel, and check the fuses
visually or with a multimeter.
Unplug the power cord,
disconnect the switch and
check operation with a
multimeter.
Check that the green LED on
the back edge of the power
supply is on. If not, the
power supply has failed.
Check surface mount LEDs
labelled "24V PWR" on the
motherboard and
measurement interface
board. If lit, power is OK.
Check for 24VDC from the
power supply using a
voltmeter.
Unplug power cables to
motherboard, measurement
interface board and rear
panel to determine where
the fault is.
If possible, check instrument
function through RS-232 or
Ethernet. Contact Thermo
Fisher Scientific Service
Thermo Fisher Scientific
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Troubleshooting
