Waters Prep Series Installation And Maintenance Manual page 122

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