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Table S-1. Resistance Checks (Power Off)­Mode1 5027RA
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TB-9-2920-225-34-1 100 AMP Regulator (Solid State) Manual
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Figure 3-6. Leece-Neville model 5027RB exploded view.
TB 9-2920-225-34-1
Table 3­2. Voltage Checks (Power On--Model 5027RA-continued
Section III. LEECE-NEVILLE MODEL R0015027RB
3-6. General. Figure 3­6 is an exploded view of
(2) Place ohmmeter probes to terminals of
the regulator, listing the major subassemblies.
the rheostat (see fig. 3-7).
Figure 3­7 is a plan view of the box and an under-
(3) Rotate rheostat fully clockwise, reading
side view of the cover, showing the interconnect
shoud be approximately 45 ohms.
wiring.
(4) Rotate rheostate fully counterclockwise,
reading should be less than 5 ohms.
3-7. Checkout and Repair.
(5) If other readings are obtained, replace
a. Diode and Relay (power disconnected).
the rheostat.
(1) Place positive probe of ohmmeter to pin
F of connector J2 (see fig. 3-7).
d. Transistor and Circuit Board. If no faulty
(2) Place negative probe to top connection of
components were detected after performing tests
diode CR2, (see fig. 3­7). Meter should read O
a, b, and c, replace the cover assembly (see fig.
ohms.
( 3 ) Place negative probe to TP1. Meter
should indicate low resistance.
NOTE
(4) Reverse probes. Meter should indicate
After final repair, check regulator on the
test stand.
(5) If other readings are obtained, replace
diode CR2.
If the regulator still does not function correctly
(6) Move negative probe to pin C of connec-
it will be necessary, if local skills permit, to test
tor J1. Meter should read approximately 55 ohms.
each component. All the parts should be checked
with an ohmmeter and the capacitors checked with
(7) If another reading is obtained, replace
a capacitance meter. The circuit board traces
relay (see fig. 3­7).
should be checked with an ohmmeter to make sure
b. Power Resistor.  Place ohmmeter probes
there are no cracked traces. Traces with hairline
across power resistor R1 (see fig. 3­7). Meter
cracks will show good at lower temperatures and
should read approximately 40 ohms.
will tend to show open circuit at higher tempera-
c. Voltage Adjustment Rheostat.
tures. If the board seems good at room tempera-
ture, but the regulator still fails, this could be the
(1) Remove voltage adjustment access screw
cause.
from the cover of regulator.
3-7

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