TM 5-3895-379-23
TROUBLESHOOTING PROCEDURES - CONTINUED
0006 00
Table 2. Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
14. Feet Per Minute (FPM) Meter Does
Not Work.
Wire 449 (part of instrument wiring harness) becomes wire 449-RD
(part of main wiring harness) at connector (R1/P1).
4. Check for signal power at FPM 1. If minimum 2.4 Vac peaks are not
Remove
two
measured at terminal S (wire 449-
shoulder screws, washers and
WH), replace or repair wire 449-
vandal guard from box assembly.
WH/449-RD and connectors from
Remove three screws and
FPM meter to speed sensor (WP
washers and lift box assembly up
from operator station. Start
engine and turn vibratory system 2. If minimum 2.4 Vac peaks are not
measured at terminal S (wire 449-
on for not more than 10 seconds.
GN), go to Step 5.
Touch positive (+) probe of
multimeter to terminal S (449-
WH) of FPM tachometer. Touch
negative (-) probe of multimeter
to good ground. Multimeter
should measure minimum of 2.4
Vac peaks. Turn engine off.
5. Check for power to FPM meter. 1. If 24 to 28 Vdc are not measured
Set multimeter to measure Vdc.
at terminal + (wire 123-WH) and
Turn engine start switch to ON
GAUGES fuse is good, replace or
position (TM 5-3895-379-10).
repair wiring and connectors to
Touch positive (+) probe of
GAUGES fuse holder (WP 0108
multimeter to terminal + (wire
123-WH) of FPM meter. Touch
negative (-) probe of multimeter 2. If 24 to 28 Vdc are present at
terminal + (wire 123-WH), replace
to good ground.
FPM meter (WP 0083 00).
614-PU
200-BK
123-WH
401-2157
449-WH
