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Figure 2­5. Vap-Air model 26440001-03.
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TB-9-2920-225-34-1 100 AMP Regulator (Solid State) Manual
Next
Figure 2-7. Circuit board­model 03.
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
Table 2­4 is a diode substitution list.
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
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
2­1 and check each separately (see fig. 2-2).
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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