TM 9-4120-388-14
4-53. RECTIFIER (CR1) - Continued.
Meter Lead
Pos
Neg
20 ohms or less
Term. 2
Term. 1
1000 ohms or more
Term. 3
Term. 1
1000 ohms or more
Term. 1
Term. 2
1000 ohms or more
Term. 4
Term. 2
20 ohms or less
Term. 2
Term. 4
1000 ohms or more
Term. 3
Term. 4
20 ohms or less
Term. 1
Term. 3
20 ohms or less
Term. 4
Term. 3
1000 ohms or more
Term. 4
Term. 1
1000 ohms or more
Term. 1
Term. 4
1000 ohms or more
Term. 3
Term. 2
80 ohms or less
Term. 2
Term. 3
NOTE
A diode bridge will sometimes act differently under a power test than resistance tests indicate.
To perform a power test, apply 28 volts AC across terminals 1 and 4 and use a DC voltmeter
with negative probe on terminal 2 and positive probe on terminal 3 to test output voltage. The
meter should read
5 volts. If output voltage is not within limits, replace rectifier.
b. Removal.
(1) Remove eight screws and packing with retainer from rear face of junction box.
(2) Pull component mounting panel out far enough to gain access to rectifier mounting nut.
(3) Tag and remove rectifier leads.
(4) Remove nut, Iockwasher, and flat washer from rectifier stud.
(5) Remove rectifier.
Installation.
c.
(1) Insert rectifier mounting stud through hole in component mounting panel and secure with nut, Iockwasher,
and flat washer.
(2) Cut heat shrinkable tubing to approximately three-quarter inch (19 mm) long.
(3) Slip heat shrinkable tubing over leads.
(4) Solder leads in place using tags and wiring diagram. (See Figure 4-16.)
(5) Slip heat shrinkable tubing over solder connection and shrink in place.
(6) Remove tags.
(7) Slip component mounting panel into place and align holes.
(8) Secure component mounting panel with eight screws and packing with retainers.
(9) Install junction box cover and tighten four captive panel fastener screws.
(10) Install junction box. (See para 4-46.)
