TM 5-4520-253-13
Table 4-1. Intermediate Maintenance Troubleshooting – Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. VENTILATING AIR MOTOR FAILS TO OPERATE.
Step 1.
Disconnect red wire (1) from ventilating air motor (3) at quick disconnect
terminal (2). Pull boot (4) away from ventilating air motor capacitor (5) and
disconnect white wire (6) from capacitor.
Check voltage across red and white
wires back to PC board for 110 V ac. Place probes of volt ohmmeter in con-
tact with terminal (2) of red wire and terminal of white wire. Plug power
cable into POWER RECEPTACLE and move HEATER-OFF-FAN switch quickly
from OFF to HEATER to OFF while observing meter. Meter should indicate
at least 110 V ac.
If no current, check power source and correct if needed. If circuit is
faulty, replace PC board. Refer to REMOVE/l INSTALL PC BOARD
ASSEMBLY, page 4-12.
4-5
