Testing Synchronizer Assembly (PU-407/M)

TM 5-6115-376-13

to test circuits of the synchronizer assembly. Per.

ductor and connector pins will be indicated by a

meter indication of O ohms.

form the resistance measurements given in table

43, with all power removed from equipment.

4-15. Testing Synchronizer Assembly

Test safety circuit breaker light DS1 by substitu-

(PU-407/M)

tion (fig. 29).

Use the AN/URM-105, arranged as an ohmmeter,

receptacle or damaged threads, replace it as

4-16. Testing Switchbox (PU-699/M)

follows.

With the AN/URM-105 arranged as an ohmmeter,

(1) Prop open the front cover of distribution

place test probe on each side of switch (S1

panel of the distribution box and remove recepta-

through S4) and with power off and switch S1

cle cover.

in on position, meter should show continuity. Do

this on all three circuits of each switch. If one

(2) Remove back panel of distribution box.

circuit does not show continuity, the switch is

Remove cover and attaching hardware. Tag and

defective and must be replaced.

disconnect wiring, then remove connector-recepta-

cle (fig. 4-4).

4-17. Ancillary Items

(3) Install replacement connector-receptacle

If the brackets, braces, mounting bases and ac-

in distribution panel, install mounting hardware,

cessory boxes are bent or missing hardware,

connect wiring, and receptacle cover, install back

remove and straighten. If unable to correct, re-

panel and close front panels. Replace a defective

place the defective item. Replace missing hard-

ware.

(4) To replace defective connector-receptacle

4-18. Distribution Boxes

in portable distribution box (fig. 45), lift lid

a. Inspection. Inspect condition of circuit

and remove screws holding control panel. Prop

breakers, panel assembly bus bars, current trans-

up the control panel and remove mounting hard-

formers, ammeters and wiring. If circuit breakers

ware. Remove connector cover, tag and discon-

don't operate smoothly, panel is dented, bus bars

nect wire leads and remove connector-receptacle

corroded, ammeters sticking, transformers

from portable distribution box.

burned, or wiring is burned or loose, refer condi-

(5) Install replacement connector-receptacle

tions to direct support maintenance.

in portable distribution box, and install mounting

b. Connector-Receptacles. There are nine con-

hardware and cover. Install wire leads, insert

nector-receptacles on each distribution box, one

control panel into place inside the portable dis-

on each portable distribution box. If visual inspec-

tribution box, add mounting screws and close lid.

tion indicates a cracked or corroded connector-

Replace a defective receptacle cover.

4-8