3-38 Troubleshooting, Testing, and Maintenance
The table below lists diagnostic tests available through the extended test
routine.
Tip: If any tests fail during this procedure, contact Waters Technical Service.
Tools
The only tools required for the extended test routine are a jumper wire to
short various controller rear panel terminals and a screwdriver.
Extended test routine
Test Description
Keyboard test An echo of the key being pressed appears on the CRT.
LCD test Displays all characters in upper- and lowercase.
Stop Flow Input
test
Tests the Stop Flow input switch on the rear panel.
External Inject test Tests the INJ input terminal on the rear panel.
External Switches
and Hold Output
tests
Tests each of the four switch terminals and the Hold
output terminal on the rear panel.
Chart test Produces a 0- to 10-mV sawtooth waveform at the
chart terminals on the rear panel.
Sparge valve test Turns each sparge valve on and off in sequence.
Pump and solvent
valve test
Sets the pump to 1.0 mL/min (500-µL) or 4.0 mL/min
(100-µL) and switches the solvent valves periodically.
IEEE-488 test CPU reads and displays the setting of the IEEE-488
address switch on the rear panel.
RS-232 test Tests RS-232 communication.
12 VAC Fail test Operates the valves at a fast rate continuously
applying 12 VAC to the valves continuously. If this
condition is detected, the test passes.
Counter test Verifies that the valves cannot switch to a 50/50
condition.
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