TM-9-2350-261-20-1

CARRIER, M113A2, M577A2, M1064, M1068, M1059 AND M901A1

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL - VOLUME 1 OF 4

TM-9-2350-261-20-1 - Page 262 of 346

TM 9-2350-261-20-1

INFRARED PERISCOPE WORKS IMPROPERLY — Continued

0040 00

BY

1.

Remove periscope power pack 517 lead (1) from I.R.

power pack (2).

2.

Measure resistance between lead ends (1) and (3)

(inner and outer).

3.

Does multimeter read 0 ohms both times?

BYN

1.

Replace I.R. periscope power

pack lead.

2.

Install original I.R. power pack

(WP029100orWP029300)

.

3.

Verify no faults found.

B2Y

1.

Remove circuit plug 516 (1) and 516 A (2) from I.R.

POWER switch jacks (3) and (4).

2.

Measure resistance between I.R. POWER switch jacks

(3) and (4) with switch ON.

3.

Does multimeter read 0 ohms?

B2YN

1.

Replace I.R. POWER switch

(WP 0241 00).

2.

Install original I.R. power pack

(WP029100orWP029300)

.

3.

Verify no faults found.

004000-3