Table 5-1. Direct Support Troubleshooting Chart - Continued

TM 11-6140-224-13&P

Table 5-1. Direct Support Troubleshooting Chart - Continued

CONDITION

PROBABLE TROUBLE

CORRECTION

Low storage battery voltage.

Electrical leakage.

Test in accordance with paragraph 4-9. If

readings are above 1 volt, battery must be

cleaned. Remove control module, then wash

battery with clean water and dry thoroughly.

Check leakage value before reassembling

battery.

One or more unbalanced or defective

Charge at 200 mA for 20 hours. Read open

circuit voltage, which shall be above 26 volts.

cells

Discharge at 1.2A through 20 ohms, 50 watt

resistor minimum cutoff is 1 hour. Charge at

200 mA for 20 hours. If battery does not

recover after 3 cycles, or low voltage is pre-

sent indicating a shorted cell, it should be

discarded. Salvage spare parts for use in

other batteries.

No capacity

Defective pressure switch preventing

Charge at 200 mA for 20 hours. Periodically

charge.

monitor current on PP-6148/U to assure that

pressure switch does not prematurely terminate

charge. Premature cutoff of charge after only 2

or 3 hours would indicate a defective pressure

switch. Remove the plug on the control module.

Gain access to the two pressure switches (refer

to fig. 5-1) by removing the control module and

the 6 pin connector. Use an ohmmeter to check

which switch is in the open position. Grasp

metal barrel of pressure switch and turn the cap

counterclockwise 1/4 turn to release internal

pressure. Tighten pressure switch and again

check switch contacts with an ohmmeter. If

switch is still open, battery should be discarded.

If switch is closed, reassemble top connector and

control module, then charge battery at 3A and

5-4