Table 3-4. Connections Between Display Module Sockets and A12 Timing Circuit Assembly.

TM 11-6130-392-34

socket pins is bad, disconnect testing. Forward bat-

TIME switch.

tery charger to next higher maintenance level.

(1) If display module that was bad, now reads

h. Insert removed display module into display

good, go to step f.

module socket.

(2) If display module, that was bad, still reads

i. Set POWER switch to ON.

bad; set POWER switch to OFF, replace this display

j. Set multimeter to 10 VDC scale. Connect nega-

module (Section IV, para 3-17). Go to section V.

tive lead to negative terminal of capacitor C1 (fig.

f. Set POWER switch to OFF. Refer to paragraph

3 - 3 ) . With positive lead of multimeter, measure

3-9b. and put A12 on the extender board.

voltage at pins 1, 27 and 28 of A12 timing circuit as-

g. Remove display module that reads wrong. Us-

ing multimeter, check continuity between each pin

(1) If the meter reading is 9.0 volts or greater

of display module socket and appropriate pin on A12

for each pin, go to step k.

timing circuit. Refer to table 3-4 and figure 3-7.

(1) If continuity for each pin on the display

(2) If the meter reading is less than 9.0 volts

f o r any pin; d i s c o n t i n u e testing, send battery

module socket is good, go to step h.

charger to next higher maintenance level.

(2) If continuity for any of the display module

Table 3-4. Connections Between Display Module Sockets and A12 Timing Circuit Assembly.

Figure 3-7. Test Point Locations, Display Module Sockets

3-11