Waters 2475, Operator'S Manual, Page: 166 / 228

5-8 Error Messages, Diagnostic Tests, and Troubleshooting
User-selected diagnostic tests and settings
Tip:
The detector uses both user-selectable and service diagnostic tests and
settings. Only qualified Waters Service personnel can access service
diagnostic tests.
Overview of diagnostic tests and settings
You may operate several diagnostic tests and settings for use in
troubleshooting the detector and verifying proper functioning of the detector’s
electronics and optics.
Performing tests and changing settings
To perform the tests and change settings:
1. Press DIAG on the keypad. The Diagnostics list appears.
System cannot respond Error occurs while unit
is positioning next
wavelength or changing
modes during
initialization or
calibration.
1. Power-off and
power-on again.
2. If the problem
persists, call Waters
Technical Service.
System not calibrated The calibration read
from nonvolatile
memory is not valid.
1. Power-off and
power-on again.
2. If the problem
persists, call Waters
Technical Service.
Units not normalized No valid normalization
constants are saved in
the battery-backed
memory of the CPU.
Run the normalization
function (see
page 3-36 ).
Error messages preventing operation (Continued)
Error message Description Corrective action