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F-18
TROUBLESHOOTING AND REPAIR
F-18
TEST PROCEDURE
1. Remove input power to the LN-8.
2. Using the 5/16 in. nutdriver,
remove the screws from the left
side cover assembly.
3. Lift the left side cover.
4. Locate the 1CR relay. Slide the
retaining clip off the relay and
carefully remove the relay from the
relay board. See Figure F.4.
Note: The Molex plug located on the
relay board may have to be removed to
gain access to the 1CR relay.
5. Connect the 24VDC supply to ter-
minals A- and B+ on the 1CR
relay. Do not energize the power
supply at this time.
6. Connect the ohmmeter across the
first set of terminals shown in
Table F.2.
LN-8
1CR RELAY TEST (continued)
FIGURE F.4 – 1CR RELAY TEST POINTS
1
2
3
4
5
6
7
8
9
AB
NORMALLY CLOSED
NORMALLY OPEN
COMMON
-
+
24VDC
MOLEX
PLUG
RELAY
BOARD
RETAINING
CLIP
1CR RELAY