Replacing Fuses - Waters Prep Series Installation And Maintenance Manual

8. Push the O-ring into place on the retainer.
9. Gently slide the pump head onto the plunger, ensuring the indicator rod
is in the correct hole.
10. Insert the two hex-head screws, holding the pump head assembly in
place, and alternately tighten them.
11. Reconnect the plunger wash. Use a syringe to push solvent through the
two pump heads until it exits the second pump head. This primes the
plunger wash and ensures the plunger is lubricated when you run the
pump.
12. Start the pump, and set the flow rate to 3.0 mL/min. Pull out and release
the indicator rod. If it does not snap back, the pump head is misaligned.
Loosen the pump head and rotate it slightly to correct the alignment.
13. Reconnect the solvent lines, and examine them for leaks.

Replacing fuses

This section includes procedures for replacing fuses on the rear panel of the
controller and fluid handling unit. These procedures describe how to replace
the following fuses:
• Operating voltage fuses
• Auxiliary +12 VAC fuse
• Pump power fuse
• Proportioning valve fuse
Operating voltage fuses
All controllers are supplied with two 4-A fuses installed for 110/120 VAC
operation. If you intend to operate the unit on 220/240 VAC power, change to
the IEC-approved 2-A, 250-VAC fuses, as outlined next.
The Prep system is protected from abnormal line power situations or
component anomalies by fuses located at the power cord connector. If the LCD
fails to display the Startup screen and the fans fail to run when the controller
is turned on, examine the main fuses for opens.
Maintenance procedures 3-67