Chapter 4: FUNCTIONING AND TROUBLESHOOTING

11-6625-823-15

CHAPTER 4

FUNCTIONING AND TROUBLESHOOTING

Section I. FUNCTIONING

C battery section of the U-241/PSM-13. The

4-1. Functioning of TS-1301/PSM-l3

load resistors simulate the battery drain when

(fig. 4-1)

they are used in the appropriate radio equip-

The selector switch SIA and SIB contacts on

ment. The voltage-dropping resistor is in series

Test Set, Battery TS-1301/PSM-13 connect

with the meter; together they determine the

the meter across the two pins of the octal plug

ratio of current flow through the meter to the

for each of the four switch positions. The

battery voltage. Because all battery sections

meter connections are reversed to read the

are loaded when the test set is connected,

negative voltage when testing a C section of a

regardless of what section is selected, the

battery.

batteries must be disconnected as soon as tesk

4-2. Functioning of Adapter Connectors

ing is completed. The adapter connectors which

(fig. 4-1)

have the higher wattage load resistors are cast

in an aluminum filled material for maximum

The adapter connectors have a load resistor for

heat dissipation.

each battery section to be tested,. except for the

Section Il. TROUBLESHOOTING

good, can save making many resistance checks

4-3. Troubleshooting procedures

if its items are substituted one by one during

a. The first step in servicing a defective

operational tests on the defective AN/PSM-

battery tester is to locate the component item

13.

or components not functioning properly. An

c. If no shortcut method is available, the

operational test on good batteries is an excel-

troubleshooting chart can be used to suggest

lent test of all the components.

probable corrective action to common troubles.

d. The only electrical corrective action pos-

b. A second AN/PSM-13 can be used on a

sible is to replace the meter; all the other

swapping basis to locate which component is

components are expendable.

d e f e c t i v e . One AN/PSM-13, known to be

4-4. General Support Troubleshooting Chart

Note. The only test equipment required is Multimeter T S-352B/U, which is used to take continuity and resist-

ance measurements.

Item

Probable trouble

No.

Checks and corrective measures

Trouble symptom

Meter defective ----------Replace meter (para 4-6).

1 ------- No meter reading for any con-

dition.

Switch defective ------------- Replace TS-1301/PSM-13

2 -------- No meter reading at one selec-

tor switch position.

Adapter connector defective--- Replace adapter connector.

3-------- No meter reading on one sec-

tion of one adaptor connector.

4-1