Figure 4-1. Dc To Dc Replacement - Welch Allyn 52000 Series Service Manual

Disassembly and Repair Section 4
Note: The front housing is now free of the rear housing.
17. Separating the main PCB from the display PCB.
18. Unplug the main PCB to display PCB flex circuit.
19. Remove seven (7) torx fasteners with the torx t8 bit and lift the main PCB and the
temperature PCB out of the front housing.
Replacing the DC to DC converter from the main PCB:
20. Peel off the rtv surrounding the old converter.
21. De-solder the old converter.
22. Clear the 8 holes out with a thru-hole solder sucker.
23. Install a replacement converter as per Figure 4-1 below.
24. Secure with rtv (innerbond i-45) on all four sides.

Figure 4-1. DC to DC replacement.

Note: Reassemble in reverse order, no special techniques required.
Verification of repair:
25. When completely assembled, switch the unit to "on" and perform a full functional
check, including recalibration.
Service Manual 95P445E Rev. C Welch Allyn Vital Signs Monitor 37