Replacing A Pump Pcb - Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual

6
Field Service Maintenance

Replacing a Pump PCB

Replacing a Pump PCB
124 EASY-nLC 1200 Troubleshooting & Maintenance Guide
5. Prime the pump as described in
6. Mount the tubing back on the pump head. Tighten the fitting using a 1/4 in. open-ended
wrench.
7. Draw fresh solvent into the solvent lines and remove air from the pump head as described
in "Removing Air After Replacing a Piston Seal or a Pump"
8. Depending on the pump you are replacing, do the following:
• When replacing pump A or B, run the pump leak test, and then run the flow sensor
calibration (see "Leaks"
• When replacing pump S, run the sample pickup test (see
page 42).
Replacing the pump PCB requires these items:
Tools
• #2 Phillips screwdriver
• 2.5 mm hex wrench
• Small flathead screwdriver
To replace the pump PCB on the PLU pump, follow these procedures:
1. "To remove a pump PCB,"
2. "To replace a pump PCB"
❖ To remove a pump PCB
1. Close down the EASY-nLC 1200 instrument as described in
EASY-nLC Instrument"
2. Disconnect the power cable from the instrument's back panel.
3. Using a #2 Phillips head screwdriver, make a quarter-turn to loosen the three captive
screws that secure the right side panel to the instrument housing. Then remove the panel.
4. Disconnect the P-Bus communication cables, the flow sensor cable, and the pressure
sensor cable from the pump.
Figure 110 on page 125
"Priming the Pump"
on page 44 and "Constant Pressure"
Parts
Pump PCB, P/N LC590
next procedure
on page 127
on page 22.
shows these cables connected to the pump.
on page 78.
on page 81.
on page 50).
"Sample Pickup"
"Closing Down the
Thermo Scientific
on