Welch Allyn Medical Diagnostic Equipment Model 406 Heart Rate Monitor User Manual


 
Service Manual Repair procedures 39
Removing the front case and/or replacing the display (5 GHz)
1. Unplug the display cable from connector J4 and keyboard cable from connector J3.
2. Lift the main board subassembly (main board, subframe and radio card) out of the
front case, leaving enough room to access the antenna cables. While supporting the
main board subassembly, free the gray antenna cable from between the display
cushion and the standoff and the black cable from around the outside of the standoff.
3. Place the main board down next to the front case.
4. Remove the screw securing the antenna board to the front case.
Caution Make sure not to stress the antenna connection cables.
J4
J3
(SpO
2
shield not shown here for clarity.)
Screw standoff
Display cushion
Antenna board screw