Bacharach Microprocessor Module Replacement Kit Instruction Manual - page 3
Microprocessor Module Replacement for Single-Zone Leak Monitors
3015-5550 Rev 2
3
f.
Note the orientation of the module, specifically the gold tab and hole oriented on the bottom left of the board.
Refer to Figure 3.
Figure 3. Orientation of Microprocessor Module
5. Microprocessor Module Removal
Remove the installed microprocessor module by following the steps below.
a. Grasp the left and right edges of the microprocessor module and gently pull outward away from the main
board while rocking the microprocessor board left to right, until it comes free of the socket.
b. Dispose of the removed microprocessor module in accordance with local regulations for electronic equipment.
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
a. 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.)
b. 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 3 as a guide.
c. Remove the new microprocessor module from its packaging, handling the board by the edges only.
d. Orient the new microprocessor so the gold tab and hole are at the bottom left corner (refer to Figure 3).
e. Carefully align the two rows of pins on the back of the processor with the mating socket on the main circuit
board in the Single Zone, 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.
f.
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.
Note Position of Gold Tab
and Hole (Bottom Left)