Replacing a Pump PCB. Thermo Fisher Scientific EASY-nLC Series Troubleshooting and

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Replacing a Pump PCB. Thermo Fisher Scientific EASY-nLC Series Troubleshooting and | Manualzz

5

Field Service Maintenance

Replacing a Pump PCB

Replacing a Pump PCB

The procedure for replacing the pump PCB differs between the PLU model pump and the

PLF model pump.

Note The PLU pump is standard in the EASY-nLC 1000 instrument. The PLF pump is standard in most EASY-nLC II instruments.

Figure 8 on page 9 shows these two pump

models.

To replace a pump PCB, follow the appropriate procedure:

“Replacing a Pump PCB in the PLU Pump,” on this page

“Replacing a Pump PCB in the PLF Pump” on page 167

Replacing a Pump PCB in the PLU Pump

Replacing the pump PCB on the PLU model pump requires these items.

Tools

• #2 Phillips screwdriver

• 2.5 mm hex wrench

• Small flathead screwdriver

Parts

Pump PCB, P/N LC574

To replace the pump PCB on the PLU pump, follow these steps:

1.

“To remove a pump PCB from the PLU model pump,”

on this page

2.

“To replace a pump PCB on the PLU model pump” on page 166

To remove a pump PCB from the PLU model pump

1. Close down the EASY-nLC 1000 instrument as described in

“Closing Down the

EASY-nLC Instrument” on page 21 .

2. Disconnect the power cable from the instrument’s back panel.

3. Using a #2 Phillips head screwdriver, with a quarter-turn 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 176 on page 164 shows these cables connected to the pump.

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5

Field Service Maintenance

Replacing a Pump PCB

5. Using a 2.5 mm L-hex wrench or ball driver, loosen the four captive screws on the PCB shield (see

Figure 176 ). Then remove the PCB shield (see Figure 177

).

Figure 176. Four PCB shield screws (PLU model pump)

Flow sensor cable

Pressure sensor cable

P-Bus cables

The four captive screws remain in place (see Figure 177

).

Figure 177. Removing the PCB shield (PLU model pump)

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5

Field Service Maintenance

Replacing a Pump PCB

6. Slide the PCB forward and away from the four mounting studs.

7. Disconnect the motor cable on the back of the pump PCB (see

Figure 178 ).

Figure 178. Motor cable connected to the pump PCB (PLU model pump)

Motor cable

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Field Service Maintenance

Replacing a Pump PCB

To replace a pump PCB on the PLU model pump

1. Using a small flathead screwdriver, reset the address on the rotary switch on the pump

PCB (see Figure 179

) as follows:

• Pump A =1

• Pump B = 2

• Pump S = 3

Figure 179. PCB rotary switch

PCB rotary switch

2. Plug the motor cable into the back of the PCB (see Figure 178 on page 165 ).

3. Insert the new pump PCB onto the pump.

4. Install the PCB shield.

5. Using a 2.5 mm L-hex wrench or ball driver, tighten the four 2.5 mm hex screws in the

PCB shield.

6. Reconnect the P-Bus communication cables, the flow sensor cable, and the pressure

sensor cable (see Figure 176 on page 164

) to the pump.

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 “Calibrate –

Flow Sensors” on page 51 .

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Field Service Maintenance

Replacing a Pump PCB

Replacing a Pump PCB in the PLF Pump

Replacing a pump PCB (PLF model pump) in the EASY-nLC II instrument requires these items.

Tools

• #2 Phillips screwdriver

• 2.5 mm hex wrench

• Small flathead screwdriver

Parts

Pump PCB, P/N LC274

To replace the PCB on a PLF pump, follow these steps:

1.

To remove the pump PCB from the PLF model pump (EASY-nLC II instrument)

2.

To install the pump PCB on a PLF pump (EASY-nLC II instrument)

To remove the pump PCB from the PLF model pump (EASY-nLC II instrument)

1. Close down the EASY-nLC II instrument as described in “Closing Down the EASY-nLC

Instrument” on page 21

.

2. Disconnect the power cable from the instrument’s back panel.

3. Using a #2 Phillips head screwdriver, with a quarter-turn 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 (see Figure 169 on page 158 ) from the

pump actuator.

5. Unscrew and remove the four 2.5 mm hex screws that connect the PCB to the pump.

6. Disconnect the pressure sensor grounding cable (yellow wire).

7. Gently slide the PCB outward and turn it around to gain access to its back side.

8. Disconnect the pressure sensor communication cable. Take care to avoid putting any stress on the cables.

9. Disconnect the motor cable. Again, take care to avoid putting any stress on the cables.

10. Remove the PCB.

11. Go to the next procedure

“To install the pump PCB on a PLF pump (EASY-nLC II instrument).”

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Field Service Maintenance

Replacing a Pump PCB

To install the pump PCB on a PLF pump (EASY-nLC II instrument)

1. Remove the damaged PCB as described in the previous procedure, “To remove the pump

PCB from the PLF model pump (EASY-nLC II instrument)” on page 167 .

2. Using a small flathead screwdriver, reset the address on the rotary switch on the new pump PCB as follows:

• Pump A =1

• Pump B=2

• Pump S=3

3. Reconnect the motor cable to the back of the PCB (see

Figure 178 on page 165

).

4. Mount the new PCB onto the pump.

5. Secure the PCB to the pump as follows:

• Slide the four screws into the holes in the four corners of the PCB.

• Slide the connector at the end of the pressure sensor grounding cable under the screw in the lower-right corner of the PCB.

• Using a 2.5 mm hex wrench, tighten the four screws.

Figure 180. PLF pump with the pressure sensor cable connected

9

0 1

2

P-Bus cable

Pressure sensor grounding cable

P-Bus cable

Motor cable routed to the back of the PCB

CAUTION To avoid damaging the PCB, make sure that the grounding connector does not touch any other components.

6. Reconnect the P-Bus communication cables.

7. Calibrate the flow sensor by following the automated script described in “Calibrate –

Flow Sensors” on page 51 .

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6

Troubleshooting

To troubleshoot problems with the EASY-nLC instrument, follow the troubleshooting tips and procedures in this chapter.

Contents

Troubleshooting Tips

Using the Direct Controls for Troubleshooting and Maintenance

Troubleshooting a Pump that Fails the Flush Air Script

Troubleshooting a Pump that Fails the Leaks Script

Running a System Leak Test

Troubleshooting the Results of the System Leak Test

Identifying a Leaking Check Valve

Troubleshooting a System Blockage

Troubleshooting the Autosampler Aspiration and Calibration

Checking Sample Pickup

Troubleshooting Communication Problems

Verifying that the LC/MS System Is Properly Grounded

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