from 0 to 90, with the single plane of the polarizer. This
portion of the projected image appears to move. The rate
of motion is controlled by the rotational speed of the
polarizer.
(3) In a similar manner, animation can be restricted to certain
colors by using tinted polarized transparencies.
c. Electrical Circuits. The electrical circuits (fig. 23.5), which
operate from a 110- to 12.5-volt, 50- to 60-cps power source, rotate the
spinner motor and, in turn, the polarizer.
(1) When switch S1 is closed, power is applied in parallel to neon
indicator DS1 and to motor B1 in series with speed control
R1.
(2) The motor speed is controlled by R1 which is shunted on alter-
nate half cycles by diode CR1. This shunting effect permits
a greater range and smoothness of speed control.
49.5. Troubleshooting
a. Preliminary Procedure. If the spinner is inoperative and the
cause is not immediately apparent, make sure that the trouble is not
due to a defective power connection between the spinner and the ac
source. Connect the spinner power cable to a 115-volt ac outlet other
than that of the projector if that was originally used.
b. Troubleshooting Chart.
Remedy
Probable cause
Symptom
Defective plug - - - - - - - Replace plug.
Power indicator does not light;
polarizer does not rotate.
Defective cable - - - - - Repair or replace
cable.
Defective neon lamp- Replace neon lamp.
Power indicator does not light;
polarizer rotates.
Defective variable
Replace variable
Polarizer does not rotate - - - - - -
resistor.
resistor.
Defective motor - - - - Replace motor.
Loose pulley - - - - - - Tighten setscrew on
pulley.
Dcfective pulley or
Replace pulley or
roller.
roller.
Rotating polarizer
Replace rotating
binding.
polarizer assembly.
Worn or broken belt Replace belt.
Defective motor - - - - - Replace motor.
Erratic rotational speed - - - - - - -
Pulley slips - - - - - - - Adjust motor posi-
tion (para. 49.7).
Diode CR1 shorted- - - - Replace diode.
Rotating polarizer operates faster
than normal; speed control does
not affect speed.
Diode CR1 open - - - - -
Replace diode.
Rotating polarizer can be adjusted
to below 20 rpm; speed control
sensitive.
6
TAGO 763B
