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Table 3-3. Resistance Checks (Power Off) - Model 5027RC
Up
TB-9-2920-225-34-1 100 AMP Regulator (Solid State) Manual
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Figure 3-12. Leece-Neville-model 5027RD.
TB 9-2920-225-34-1
Section V. LEECE-NEVILLE MODEL R0015027RD
Failed devices have been successfully replaced
3-10. General. Figure 3­12 is a plan view of the
with part number 71590­WT-100 by performing
regulator with the cover removed, showing the
some minor mechanical modification.
heat sink and the circuit board. The components
Globe-Union Inc. FSCM 71590
are indicated by their reference designations, and
Centralab Electronics Div.
on the circuit board the terminals are associated
Hwy. 20 W. P.O. Box 858
wire colors are also indicated. Figure 3­13 is a
Fort Dodge, IA 50501
plan view of the regulator with the cover, heat
(10) Place positive ohmmeter probe on TP15
sink and circuit board removed, showing the relay
and negative probe on TP16. The reading should
and remaining components. The components are
be greater than 10 ohms and less than 100 ohms;
indicated by their reference designations, and test
if not, replace D3.
points 1 through 5 are shown. Figure 3-14 is a
b. Resistor R10.
plan view of the regulator with the cover removed,
(1) Place ohmmeter probes on pins D and E
showing test points 6 through 18. There are 18
of connector J2. Meter should read approximately
total test points. Figure 3-15 is an electrical sche-
0.4 ohms.
matic diagram of the regulator circuit.
(2) If other readings are obtained, replace
resistor.
3-11. Checkout and Repair.
c. Resistor R9.
a. Relay (see Figs. 3­13 and 3­14) (power dis-
(1) Place ohmmeter probes on TP5 and pin
connected).
C of connector J2. Meter should read 0 ohms plus
(resistor is actually rated at 0.05 ohms).
(1) Place positive probe of ohmmeter on pin
F of connector J2 and negative probe on TP1
(2) If other readings are obtained, check the
(white/yellow wire). Meter should read low ohms
wiring from the bottom terminal of the resistor
to pin C on connector J2. If the wire continuity is
(hundreds).
good, replace the resistor.
(2) Reverse probes. Meter should read high
d. Detailed Circuit Checks. Table 3­5 contains
ohms (thousands).
"power off" resistance checks of the circuit (see
(3) If other readings are obtained, see de-
figs. 3­12, 3-14 and 3-15 for test points).
tailed circuit check below.
(4) Place ohmmeter positive probe on TP2
e. Functional Check. Check the performance of
the regulator on the test stand and make final volt-
and negative probe on TP1. Meter should read
approximately 50 ohms.
age adjustments. Voltage output should read 28
volts. If the regulator does not function properly,
(5) Reverse probes. Meter should read low
perform the following:
ohms (more than 10 and less than 100).
(1) Check wires and connections.
(6) If other readings are obtained, discon-
(2) Replace cover assembly.
nect the WHT/YLW wire on TP1 and repeat (4)
(3) Perform bench test procedures.
and (5) looking for a meter reading of 40 to 60
ohms in each case. If other readings are obtained
NOTE
replace the relay, NSN 5945­00-409-3883. Re-
place the WHT/YLW wire on TP1.
After final repair, check regulator on the
(7) Place ohmmeter probes on TP3 and TP4.
test stand.
Meter should read infinity (open circuit). If other
If the regulator still noes not function correctly
readings are obtained replace the relay, NSN
it will be necessary, if local skills permit, to test
each component. All the parts should be checked
(8) Place positive ohmmeter probe on TP17
with an ohmmeter and the capacitors checked with
and negative probe on TP8. The reading should
a capacitance meter. The circuit board traces
be greater than 10 ohms and less than 100 ohms;
should be checked with an ohmmeter to ensure
if not replace Ql, NSN 5961­00­730­3284.
that there are no cracked traces. Traces with
(9) Place positive ohmmeter probe on TP12
hairline cracks will show as good at lower tem-
and negative probe on TP13. Rotate the potenti-
peratures and will tend to show open circuit at
ometer. Full counterclockwise should be 0 ohms,
higher temperatures. If the board seems good at
gradually increasing to 100 ohms at full clockwide.
room temperature, but the regulator still fails,
If not, replace the potentiometer. The potenti-
this could be the cause.
ometer is a 100 ohm, 2 watt, tab-mounted device.
3-15

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