TM 9-4910-387-14-2
D.
STEPPING RELAY MAY BE DEFECTIVE.
NOTE
The stepping relay (1) has two coils. One coil is for the
stepper and the other coil is for reset.
The following checks are for resistance.
1 Connect one multimeter lead to stepping relay coil contact (2) and
connect the other lead to stepping relay coil contact (3). Resistance
should be approximately 300 ohms.
2 Remove both leads. Connect one multimeter lead to stepping relay
coil contact (4) and connect the other lead to stepping relay coil
contact (5). Resistance should be approximately 18 K ohms.
3 Check stepping relay coil contacts to ensure that they are not burned
or welded together.
4 If resistance is not present or stepping relay coil co tacts are
n
damaged, replace the stepping relay (1) (p 6-187).
5 If counting circuit does not function, proceed to step E.
6-99
