Service manual

Service Manual Repair Procedures 61
When installing the Analog board:
• Blow out any dust and particulates from the board using pressurized de-ionized
gas before installing it.
• Align the board so that P4 correctly plugs into J4.
• Torque the screws holding the Analog board to 3.8in-lbs to 4.2in-lbs (.43N-m to
.47N-m).
Replacing the Digital Board
If a problem occurs with the Digital board, return the entire monitor to Welch Allyn for
service. See “Technical Support Services” on page 6.
The Digital board is secured beneath the Analog board by four screws and one hex post.
The four screws are located in the black brackets, the hex post is located in the lower right
corner of the board.
1. Remove the battery pack (“Replacing the Battery Pack” on page 52).
2. Open the monitor (“Opening the Monitor” on page 55).
3. Remove the Analog board (“Replacing the Analog Board” on page 59).
4. Remove the four screws fastening the Digital board to the front chassis.
Note
Do not remove the PROM from the Digital board.