WARNING
Electrical shock hazard. All repairs should be done by service
personnel authorized by GE. Do not open any covers or replace
parts unless specifically stated in the user documentation.
7.1
General
When contacting GE for support, state the program version of the instrument, which is
shown for 2 seconds after the selftest, during switch-on, or in the menu Check Service
Mode.
7.2
Faults and actions
If the suggested actions do not correct the fault, call GE.
Corrective action
Possible cause
Fault
Check that the mains ca-
ble is connected and the
On/off switch is in ON-po-
sition (I)
No power to the monitor
No text on the front dis-
play
Check with water if the
signal is still noisy
The buffer may be impure
Noisy UV-signal, signal
drift or instability
Clean the UV cell, see
Cleaning the flow cell, on
page 60
Dirt in the flow cell or fiber
connectors
Allow buffer mixtures to
stabilize before use (1 to 2
h)
There may be air in the
flow cell
Check that the flow restric-
tor (used at flow rates < 50
μL) gives a back-pressure
of 0.3 to 0.5 MPa
If there is a lot of air in the
water, degas the buffer
continuously (we recom-
mend helium sparging).
Monitor UV-900 Operating Instructions 28962214 AD
63
7 Troubleshooting
7.1 General
