Figure 3-2. References and Locations, Battery Charger PP-7286/U.

TM 11-6130-392-34

Figure 3-2. References and Locations, Battery Charger PP-7286/U.

scope probe from A11-TP4 and connect probe to

(1) If DC voltage is 0.5 volt or less, go to step c.

TB1-E8 (fig. 3-3). Connect return lead to TB1-E11.

(2) If DC voltage is more than 0.5 volt; discon-

Set POWER to ON. Measure DC voltage.

tinue testing, send battery charger to next higher

(1) If voltage is less than 5 VDC; discontinue

maintenance level.

c. Connect oscilloscope probe to A11-TP4 (fig.

testing, send battery charger to next higher main-

tenance level.

3-4). Connect return lead to A11-TP6. Set oscillo-

(2) If voltage is 5 VDC or more; set POWER to

scope controls to trigger internally from a positive 5

OFF, replace A11 power supply assembly (Section

to 10 VDC pulse. Use extender board if necessary

IV, para 3-15); go to section V.

(para 3-9b).

g. Set POWER switch to OFF. Remove oscillo-

d. Set POWER switch to ON, to see oscilloscope

scope probe from A11-TP4 and connect to A12 (fig.

waveform. Move POWER switch to ON and OFF a

3-2) using pin 32 on extender board (para 3-9b).

f e w times to see waveform appear each time

P O W E R is turned "on." C o m p a r e waveform on

Connect return lead to A12 pin 36.

h. Set POWER switch to ON, to see oscilloscope

oscilloscope with battery charger typical trouble-

waveform. Waveform can be seen each time

shooting waveform (fig. 3-5).

POWER switch is turned to ON. Turn POWER "on-

(1) If typical waveform (fig. 3-5) is seen on

off" a few times; to see and compare with typical

oscilloscope; go to step e.

waveform (fig. 3-5).

(2) If waveform is not like figure 3-5, or there

is no waveform; go to step g.

(1) If waveform on oscilloscope is same as

figure 3-5; go to step i.

e. Check panel meter reading.

(1) Current reading; go to step f.

(2) If waveform is not same as figure 3-5; go to

step j.

(2) No current flow; set POWER "off"; go to

i. Check panel meter reading.

table 3-3.

f. Set POWER switch to OFF. Remove oscillo-

( 1 ) If current reading; discontinue testing,

3-7