Bacharach Microprocessor Module Replacement Kit Instruction Manual - page 5
Microprocessor Module Replacement Kit for Portable Area Gas Monitors
3015-5576 Rev 2
5
Figure 4. Microprocessor Module Removed from PAGM Main Board
6. Installing the New Microprocessor Module
Install the new microprocessor module by following the steps below. Depending on your hardware and the replacement
kit that you receive, there are two different installation procedures. One method accommodates different hole sizes in the
microprocessor board and the mother board, and uses two screws (0001-1552) and a female-threaded spacer (0304-
8289). The other method accommodates the newer microprocessor board and mother board which have the same size
holes, and uses a snap-in spacer (0304-8459). Follow the installation option that corresponds to the hardware that is
supplied with your kit.
OPTION A: Threaded Spacer and Two Screws
1. Remove the main board from the enclosure by disconnecting all main board connectors, removing mounting
screws, and carefully lifting the main board from the enclosure standoffs. (Note that this and other steps may not
be required if your microprocessor board is already mounted as shown in Option A.)
2. Attach the threaded standoff to the top of main board by routing one of the screws up through the underside of the
main board and securing it to the standoff. Use Figure 5 as a guide.
3. Remove the new microprocessor module from its packaging, handling the board by the edges only.
4. Orient the new microprocessor so the gold tab and hole are at the bottom left corner (refer to Figure 3).
5. Carefully align the two rows of pins on the back of the processor with the mating socket on the main circuit board
in the PAGM, then carefully press the microprocessor module firmly into the socket.
NOTE
As a guide, align the larger hole on the microprocessor module with hole in the standoff.
CAUTION
Be sure not to skip or offset the pins to the socket.
6. Feed the second securing screw through the hole in the processor board into the top of the threaded standoff and
secure it using the screwdriver. See the figure below.