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TM 9-2320-364-20-2
2-1592
49. HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS (CONT).
5.
Repair wire 1082 (see
schematic Fig 2-42) or
notify DS
Maintenance.
Verify repair, go to
Step 10 of this Fault.
YES
NO
Cooling fan operation normal
indicating 24 vdc supplied to
EPAC from CB15.
Fan and heater operates at one
speed.
FAN control switch OK.
Heater wire harness OK.
Heater resistor OK.
Wire 1082 faulty.
Rectifier M81 faulty.
Wire 1082 faulty.
Orange wire faulty.
Heater ground faulty.
Heater motor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not
measured, wire 1082 is faulty.
WARNING
6.
Replace rectifier (Para
7-19). Verify repair,
go to Step 10 of this
Fault.
YES
NO
Cooling fan operation normal
indicating 24 vdc supplied to
EPAC from CB15.
Fan and heater operates at one
speed.
FAN control switch OK.
Heater wire harness OK.
Heater resistor OK.
Wire 1082 OK.
Rectifier M81 faulty.
Wire 1082 faulty.
Orange wire faulty.
Heater ground faulty.
Heater motor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Rectifier test.
STE/ICE-R #89.
If rectifier is faulty, heater will
not operate.
WARNING
Are 22 to 28 vdc measured on
wire 1082 at AC terminal of
rectifier M81?
Is rectifier OK?
Read WARNING
on Page 2-1593
Read WARNING
on Page 2-1593
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