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 TB 9-2920-225-34-1
Figure 26.
E n d view-model 03.
NOTE
the regulator. Table 22 gives the resistance
checks, and table 23 gives the voltage checks.
Transistors Q8 and Q9 are identical and
can be interchanged. Transistor Q7 must
be replaced by a like item in the same
2-7. Checkout and Repair.
socket (see fig. 25).
a. Voltage Adjustment Rheostat (R6) (power
(4) Check the mica insulating washers be-
disconnected).
tween the transistors and mounting plate. Replace
(1) Remove voltage adjustment access plug
if cracked, broken or missing. Coat washers with
(see fig. 2-5).
insulation compound per MIL-S-8660, NSN 6850-
(2) Place ohmmeter test probes to terminals
00-880-7616.
of the rheostat (see fig. 25).
c. Diode.
(3) Rotate rheostat. fully clockwise; reading
(1) Remove four screws holding transistor
should be less than 5 ohms.
mounting plate and move plate to one side.
(4) If other readings are obtained, replace
(2) Place negative ohmmeter probe to the
rheostat with Vap-Air part number 26527097.
connector side of diode D5 and D6, individually
(see figs. 2-5 and 2-9).
b. Transistors.
(3) Place positive probe to the circuit board
(1) Carefully remove transistors Q7, Q8, and
Q9 (see fig. 2-5).
side of D5 and D6, individually. Meter should in-
dicate high resistance.
(2) Position transistors as shown in figure
(4) Reverse probes. Meter should indicate
low resistance.
(3) If resistance v a l u e s differ from the
(5) If other readings are obtained, replace
values shown in fig. 22, replace the transistor
diodes D5 and D6, NSN 5961001031519 (see
with a new device. Q7 is Vap-Air part number
2631603319; Q8 and Q9 are Vap-Air part num-
(6) Reinstall transistor mounting plate.
ber 26316033-20.
2-7
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