TM 5-6115-271-14
TO 35C2-3-386-1
TM-05926A-14
NAVFAC P-8-613-14
NOTE
(4) Test diode CR5.
Do not install diode CR6 lead to printed
(a) Locate diode CR5 located on circuit
circuit board until transistor Q1 has been
board.
tested.
(b) Test diode CR5 with a multimeter (set
(6) Test diode CR7.
to read ohms). Measure resistance across CR5, reverse
test leads, and measure resistance again.
(a) Locate diode CR7 on circuit board.
(c) Resistance should be low (1 to 50
(b) Test diode CR7 with a multimeter (set
ohms) one way and infinite (oo) resistance the other
to read ohms). Measure resistance across CR7, reverse
way.
test leads, and measure resistance again.
(d) If low or high resistance is measured
(c) Resistance should be low (1 to 50
in both directions diode CR5 should be replaced.
ohms) one way and infinite (00) resistance the other
way.
(5) Test current regulating diode CR6.
(d) If low or high resistance is measured
(a) Locate diode CR6 located on circuit
in both directions, diode CR7 should be replaced.
board.
(7) Test transistor Q1.
CR6 from the printed circuit board.
(a) Make sure that transistor Q2 is still
removed and that one lead of diode CR6 is unattached
(c) Test diode CR6 with a multimeter (set
to the printed circuit board.
to read ohms). Measure resistance across CR6, reverse
test leads, and measure resistance again.
(b) Locate power transistor Q1 on the
printed circuit board.
(d) Resistance should be low (1 to 50
ohms) one way and greater than 500 ohms resistance
(c) Test transistor with a multimeter (set
the other way.
to read ohms). Refer to Figure 8-1A and Table 8-2.
Multimeter (+) and() refer to the multimeter test
(e) If low or high resistance is measured
leads.
in both directions diode CR6 should be replaced.
Meter Reading
Multimeter ()
Multimeter (+)
Infinite (oo)
Emitter
Collector
Infinite (oo)
Base
Collector
Infinite (oo)
Collector
Emitter
1 to 50 Ohms
Collector
Base
1 to 50 Ohms
Emitter
Base
Infinite (oo)
Base
Emitter
8-4
Change 11
