Figure 6-4. Test setup for adjusting charging voltage-sensing and cutoff circuit.

TM 11-6130-381-14

(1) Power Supply PP-3940A/G (power

(6) Engage power interlock switch S6006 (fig.

supply).

5-2) down and set the AC POWER Switch to ON.

( 2 ) Voltmeter, E l e c t r o n i c M E - 2 0 2 ( ) / U

Check to see that the POWER ON and CHARGE

(electronic voltmeter).

OFF indicator lights illuminate.

(3) Test cable (para 6-4 f ).

( 7 ) Hold the RESET (A) switch down for

b. Procedure.

approximately 4 seconds; then release it.

NOTE

( 8 ) Adjust the power supply output to 8.1

This procedure is provided to adjust R6109

volts .

( f i g . FO-3) of the battery A charging

(9) Adjust potentiometer R6109 (marked R9

voltage-sensing and cutoff circuit. If R61S4

on the control circuit cud assembly retaining bar)

of the battery B charging voltage-sensing

until the CHARGE OFF indicator light

and cutoff circuit is to be adjusted, sub-

i l l u m i n a t e s , as the CHARGE ON indicator light

s t i t u t e the battery B controls, indicators,

extinguishes.

and connector for those called out in this

( 1 0 ) Recheck the setting of R6109 by ad-

procedure.

justing the power supply output to 7.5 volts, and

check to see that the CHARGE ON indicator light

(1) Remove the battery charger subassembly

from its case (para 5-7) to reach the adjustment

illuminate and the CHARGE OFF indicator light

extinguishes as the RESET (A) switch is actuated;

P o t e n t i o m e t e r s at the top of the control circuit

then slowly increase the power supply output

card assembly retaining bar.

voltage, and check to see that the cutoff circuitry

(2) Connect the test equipment as shown in

o p e r a t e s when the power supply output is 8.1

figure 6-4

(3) Adjust the output of the power supply to

± 0.1 volts. This condition may require several

touchup adjustments; repeat the procedures given

a p p r o x i m a t e l y 7.5 volts, as measured with the

in (8), (9), and (10) above as required, to obtain

electronic voltmeter.

the correct setting.

( 4 ) Connect the AC POWER INPUT cable

to a 115 or 230-volt, 60- or 400-Hz input source.

(5) Set the SELECTOR SWITCH to 115 V

or 230 V, depending on the input source wed.

Figure 6-4. Test setup for adjusting charging voltage-sensing and cutoff circuit.

6-10