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Replace the Printed Circuit Board (PCB)
Replace the Printed Circuit Board (PCB)
1. Turn the instrument off.
2. Remove the front shell:
a) Turn the instrument face down and unscrew on the battery pack
b) Remove the battery pack and the four screws in the battery compartment
c) Remove the two screws at the top of the instrument and pull the back shell apart from the front shell.
d) Remove the two screws holding the PCBA in place.
e) Remove the PCB assembly from the front shell.
3. Remove the LCD:
a) Disengage the two snaps on the upper sides of the LCD carrier
b) Swing LCD forward watching for the ZIF connector
c) Lift the latch on the ZIF connector, and then pull the LCD cable forward and remove LCD assembly.
4. Disengage the two snaps holding the manifold carrier in place and carefully pull up the manifold carrier off the PCB.
5. Lift the latch on the 4R+ ZIF connector and pull out the 4R+ cable assembly to disconnect the pump connector from the PCB.
6. Retrieve the new PCB.
7. Connect the pump to the PCB.
8. Align the snaps on the manifold carrier and push down to engage the snaps to the PCB.
9. Insert the 4R+ ribbon cable into the ZIF connector and press down on the 4R+ ZIF latch to engage the cable.
10. Re-connect the 4R+ sensor cable.
11. Attach the LCD:
a) Insert the LCD ribbon cable into the ZIF connector and press down on the ZIF connector latch to engage the cable
b) Lever the LCD assembly back toward the PCB, then press down until the side snaps are engaged.
12. Attach the shells:
a) On the front shell, ensure the LCD gasket is aligned with the pins. The frame should be facing up.
b) Place the PCB into the front shell and insert the two screws (torque 3-4 in-lbs) to fasten both pieces.
c) Replace the back shell and install the four screws back into the battery compartment (torque 4-5 in-lbs).
d) Reinstall the two screws at the top of the instrument (torque 4-5 in-lbs).
13. Place the battery pack:
a) Engage hooks on the bottom of the battery pack
b) Push the battery pack into place.
c) Tighten the battery retention screw (torque 4-5 inlbs).
1. Turn the instrument off.