Welch Allyn 53 Service Manual page 56

Remove the Main Board from the Rear Chassis Assembly
4. Carefully tip the upper edge of the main board away from the rear chassis, far enough to
access the uppermost connectors on the component side of the board.
5. For best results, disconnect the uppermost cables first and work your way to the bottom
of the main board. For a monitor configured with all options, the approximate order of
disconnection is as follows:
Main-board Connector
(Refer to the drawing of the
main board, on page
J5
J12
J4
J1
J6
J11
J2
J7
J9
J3
J8
J10
(* Denotes optional hardware.)
6. Remove the main board.
Service Manual
Connects With
57.)
Display board – J1
* Temperature board – J1
Nurse call connector
External RS-232
LCD
Speaker
External DC Input
* SpO board – J2
2
NIBP board
Battery
* Printer data – CN3
* Printer power – CN1
56
Disassembly Procedure
Vital Signs Monitor Series 300