Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual page 149

Thermo Scientific
❖ To replace a pump PCB
1. Using a small flathead screwdriver, reset the address on the rotary switch on the pump
PCB (see Figure 113) as follows:
• Pump A =1
• Pump B = 2
• Pump S = 3
Figure 113. PCB rotary switch
2. Plug the motor cable into the back of the PCB (see
3. Insert the new pump PCB onto the pump.
4. Install the PCB shield.
5. Tighten the four 2.5 mm hex screws in the PCB shield using a 2.5 mm hex wrench or ball
driver.
6. Reconnect the P-Bus communication cables, the flow sensor cable, and the pressure
sensor cable (see Figure 110
7. Mount the right side panel to the instrument housing. Then, with a #2 screwdriver,
secure the panel by rotating the three captive screws a quarter-turn clockwise.
8. Reconnect the power cable to the back panel of the instrument.
9. Turn on the instrument.
10. Wait for 30 minutes to allow the temperature in the housing to stabilize.
11. Calibrate the flow sensor by following the automated script described in
Pressure" on page 50.
PCB rotary switch
Figure 112
on page 125) to the pump.
EASY-nLC 1200 Troubleshooting & Maintenance Guide
6
Field Service Maintenance
Replacing a Pump PCB
on page 126).
"Constant
127