TM 5-4520-253-13
R E M O V E / l N S T A L L / T E S T / R E P A I R I G N I T I O N T R A N S F O R M E R A N D C A B L E ( C O N T )
7.
8.
9.
10.
Secure left door (8) by locking one stud (9).
Install louver panels (5 and 6) by locking
eight studs (7) at each panel.
Reach through heater case opening (4) and
connect louver linkages to louvers.
Install bottom cover (3) using six screws
(1) and lock washers (2).
TESTING:
1.
2.
3.
4.
5.
Death or serious injury could occur if precautions are not
taken when maintaining this equipment. Position HEATER-
OFF-FAN switch to OFF, remove power cable plug from
POWER RECEPTACLE, and ground capacitors C1 and C2
at end cover of combustion blower. Always have another
person standing by who is trained in electric shock first aid.
Remove bottom cover and louver panels. Refer to REMOVAL, page 3-110.
Disconnect ignition cable (1) from igniter,
Disconnect yellow and white transformer wires (2 and 3)
from quick disconnect terminals (4) on PC board assem-
bly wires (5 and 6).
Using volt ohmmeter, test primary winding of transformer
(7). place one probe against wire (2) and the other probe
against wire (3). Meter should read 5-6 ohms.
Using volt ohmmeter, test secondary winding of trans-
former. Place one probe against spring (8) and
ground other probe on transformer case or shielding
of ignition cable (1 ). Meter should read 14,000 ohms.
3-113
