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Replace any defective wires. If the bulb still burns after all external
connections haven been removed, move on to step (f). If the problem has
been corrected go to step (g).
This step is to be done if step (e) shows that the light bulb still lights with
all external connections removed including A1, A2, F1 and F2. This
probably indicates that the Spartan I's, SCRs, Field diodes, and/or power
diodes are defective. The only semiconductor components that are
recommended field replaceable are the power diodes located in the
rectifier assembly mounted on the U shaped heatsink.
There are 4 terminals on the rectifier assembly. On three of the terminals
only one lug is connected. One terminal has double lug connections.
With power off,remove the connections on the three single lug terminals.
Leave the double lug connectionsas is. Insulate the bare lugs before
reapplying power. Reapply power. If light bulbs do not light, problem
could be confined solely to the rectifier assembly. Turn off power. Using
a Simpson 260 or equivalent check for proper diode action onthe bridge
assembly andpower diodes. There are three diodes inside. Place the plus
lead of the meter on the terminal next to the black dot. The other meter
lead should be placed on one of the three other terminals. Diode action
should be observed. That is, with the meter on the R X 1 scale, when the
black dotted terminal is plus in respect to the other terminal a reading of
between 10-15 OHMS will be read on the meter. With the opposite
polarity, the meter will show an open. In the same manner check the other
two terminals in respect to the black dot terminal. If the diode assembly is
faulty, replace. After replacing the rectifier assembly reconnect the wires
to the diode assembly. If the bulb still lights, the SCRs or field diodes are
probably the cause of the problem. Since these components are not
recommended field replaceable, the control should be returned to the
Polyspede factory for repair.
If the bulb does not now light on enclosed controls, proceed to step (g).
On open chassis controls turn off power and reconnect speed pot
connections and any other external connectionsif they presently are not
connected. Reapply power. If bulbs now burn go back to step (e). If
bulb does not burn go to step (g).
g) If no faults are located in the preceding steps or if they have already been
corrected, leave light bulb connected as in the preceding stepsand
reconnect A1 and A2 wires at the motor. Leave field wires disconnected
and insulated. (Open chassis controls should also have all wires except
field leads connected at this time.) Set speed control pot at zero and turn
on all power. Light should not burn. Increase speed setting to 20%. Lamp
brilliance should increase smoothly to nearly full brilliance. (Note-lamp
flicker and erratic brilliance may be observed at settings above 15% -
20%-- this is normal).
