Procedure
1. Open electronic enclosure door (using a 4mm (5/32”) Allen wrench if necessary). When
door is open DO NOT place tension on the display panel interface cable.
2. Disconnect any external interface connectors to EPC. It is recommended that all cables be
identified with their EPC connector location.
3. Remove the external gas connections from the EPC, labeling each if necessary.
4. Remove the four 4mm Allen screws that secure the manifold to the Electronics Enclosure
and then remove the assembly. These are captive screws and will be completely removed
with module.
5. If the replacement EPC a module ID jumper, move the jumper that is connected to location
J2 (bottom side of PC board) from the old module to the new module.
6. If the EPC is equipped with ID switches, set the switches on the replacement EPC to match
the ID of the EPC that was removed (see
Setting Location ID
).
7. To reinstall the new EPC, perform steps 1 to 4 in reverse order. Use caution when
reconnecting gas lines. Do not over-tighten.
8. Before applying AC power, be certain the gasket between the manifold and the Electronics
Enclosure is properly seated and interface cable connectors are correctly connected.
9. Inspect the system for leaks.
Setting the Location ID
The newest version of the EPC has DIP switches in place of the J2 ID Connector used in the
previous version. These are used to set the location ID, which is used in software as part of
the hardware ID string. The location ID is set using a binary counting of the switches from right
to left (as numbered on the board and not on the actual switches). Note that this also matches
binary wiring of the first three pins of the J2 plugs used on the bottom side of the older version
EPC.
Location ID #1
Location ID #2
Location ID #3
Location ID #4
1st switch / connector
pin set (binary 1)
Second switch / connec‐
tor pin set (binary 2)
1st & 2nd switch / con‐
nector pin set (binary 3)
3rd switch / connector
pin set (binary 4)
Electronic Compartment Component Descriptions and Maintenance Procedures
2.9 Electronic Pressure Control Module
Maxum II Reference Manual
84
Manual, 7/2017, 2000596-001
