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REPAIR/REPLACEMENT PROCEDURES
TERMINATION UNIT REPLACEMENT
4 - 2
I-E96-427B
®
Follow steps one through 16 to replace the termination unit.
1. If possible, turn off power to the cabinet, then disconnect
the +24 VDC and I/O common wiring from the E2 and E3 fas-
ton connectors of the termination unit. Mark the cables
according to their terminal assignments as you remove them.
2. If there is a serial extension cable (station link) connected,
disconnect it from the P2 connector on the termination unit.
3. Remove the RS-232-C cables from the DB-25 connectors
on the termination unit. Mark the cables according to their
connector assignments as you remove them.
4. Verify that any master module connected to the termina-
tion unit has been pulled out of its cable connection on the
module mounting unit (MMU) backplane.
5. Remove the termination unit cables from the P1 and P3
connectors on the termination unit. Mark the cables according
to their connector assignments as you remove them.
6. >When all the cables are removed from the termination
unit, remove the 2 mounting screws and the chassis ground
screw with star washer at E1 and remove the termination unit
from the field termination panel.
7. Verify that the dipshunt settings on the replacement termi-
nation unit are the same as the dipshunt settings on the faulty
termination unit.
8. Insert the tabs of the replacement termination unit into its
slot on the field termination panel as shown in Figure<N>2-9
and slide the circuit board into position.
9. Secure the termination unit circuit board to the field termi-
nation panel with the 2 mounting screws and chassis ground-
ing screw (E1). Be sure to use the star washer with the
grounding screw.
10. Connect the termination unit cables to their assigned con-
nectors on the termination unit.
11. Connect the RS-232-C cables to their assigned DB-25 con-
nectors on the termination unit.
12. If applicable, connect the serial extension cable to P2 on
the termination unit.
13. Connect the +24 VDC and common wiring to the E2 and E3
faston connectors of the termination unit.