|
| |
TM5-4120-377-14
(4) Use a multimeter set on lowest OHMS scale to test resistance across rectifier bridge in accordance
with the following table. If resistance is different from that indicated in table, replace rectifier.
TABLE 4-4. RECTIFIER TEST
Meter Lead
Resistance
Neg
Pos
Term. 1
Term. 2
20 ohms or less
Term. 1
Term. 3
1000 ohms or more
Term. 2
Term. 1
1000 ohms or more
Term. 2
Term. 4
1000 ohms or more
Term. 4
Term. 2
20 ohms or less
Term. 4
Term. 3
1000 ohms or more
Term. 3
Term. 1
20 ohms or less
Term. 3
Term. 4
20 ohms or less
Term. 1
Term. 4
1000 ohms or more
Term. 4
Term. 1
1000 ohms or more
Term. 2
Term. 3
1000 ohms or more
Term. 3
Term. 2
80 ohms or less
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 24 ±5 volts. If output voltage is not within limits, replace
rectifier.
c. Removal
(1)
(2)
(3)
(4)
(5)
Using a screwdriver, remove eight screws and packing with retainer from rear face of junction box.
Pull component mounting panel out far enough to gain access to rectifier mounting nut.
Tag and remove rectifier leads.
Using wrench, remove nut, lock washer, and flat washer from rectifier stud.
Remove rectifier.
d. Installation
(1) Insert rectifier mounting stud through hole in component mounting panel and secure with nut, lock
washer, and flat washer.
(2)
(3)
(4)
(5)
(6)
4-104
Cut heat shrink tubing to approximately three-quarter inch (1.9 cm) long.
Slip heat shrinkable tubing over leads.
Solder leads in place using tags and wiring diagram. (See fig. 4-20.)
Slip heat shrinkable tubing over solder connection and shrink in place.
Remove tags.
|
