Figure 4-5. Bottom View Of Valve (Pneutronics) - Welch Allyn 52000 Series Service Manual

Disassembly and Repair Section 4
Note: The front housing is now free of the rear housing.
Removing the valve:
16. Remove the tubing from the valve.
17. Unscrew two torx fasteners. Use the t8 torx bit.
18. Gently remove the valve from the rear housing.
19. Disconnect the two spade connectors from the valve.
Installing a replacement valve: See figure 4-5.
20. Connect the green wire spade connector to the left terminal.
21. Connect the dark brown wire spade connector to the right terminal.
22. Replace two torx fasteners using a torx t8 bit.
23. Connect the tube to the barb connector of the valve.

Figure 4-5. Bottom view of valve (Pneutronics).

24. Reassemble in reverse order with attention to the following details.
Placement of wires during reassembly:
25. Make sure the four pin wire harness is routed over and around the valve, and not
underneath it.
26. Make sure that no wires are pinched underneath the valve.
27. Make sure that the dark brown and green wires are pushed down into the housing to
eliminate any interference with the gears of the printer.
Verification of repair:
28. When completely assembled, switch the unit to "on" and perform a full functional
check and re-calibration.
Service Manual 95P445E Rev. C Welch Allyn Vital Signs Monitor 53