Table 1. Standard Heater Circuit Troubleshooting Procedures.

TM 9-2320-303-24-1

Table 1. Standard Heater Circuit Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Medium-high Speed Does Not Operate.

1. Disconnect lead 98F from If +12 VDC is present, go to step

heater fan control. Check for 2. If no voltage is present, replace

+12 VDC at heater fan control heater fan control (WP 0069 00).

connector (F) with heater fan

control in medium-high mode.

2. Disconnect lead 98F from If no voltage is present, repair lead

heater fan resistor block. Check 98F.

for +12 VDC at lead 98F.

Medium Speed Does Not Operate.

1. Disconnect lead 98E from If +12 VDC is present, go to step

heater fan control. Check for 2. If no voltage is present, replace

+12 VDC at heater fan control heater fan control (WP 0069 00).

connector (C) with heater fan

control in medium mode.

2. Disconnect lead 98E from If +12 VDC is present, go to step

resistor block. Check for +12 3. If no voltage is present, repair

lead 98E.

VDC at lead 98E.

3. Disconnect leads 98E and 98F If no continuity is indicated,

from heater fan resistor block. replace resistor block (WP 0213

Check for continuity between 00).

contacts of heater resistor

block.

Low Speed Does Not Operate.

1. Disconnect lead 98Y from If +12 VDC is present, go to step

heater fan control. Check for 2. If no voltage is present, replace

+12 VDC at heater fan control heater fan control (WP 0069 00).

connector (E) with heater fan

control in low mode.

2. Disconnect lead 98Y from If +12 VDC is present, go to step

heater fan resistor block. Check 3. If no voltage is present, repair

for +12 VDC at lead 98Y.

lead 98Y.

3. Disconnect leads 98Y and 98E If no continuity is indicated,

from heater fan resistor block. replace heater fan resistor block

Check for continuity between (WP 0213 00).

contacts of resistor block.

END OF WORK PACKAGE

0010 00-41/(0010 00-42 blank)