Troubleshooting

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.

Defective motor - - - - Replace motor.

Loose pulley - - - - - - Tighten setscrew on

pulley.

Dcfective pulley or

Replace pulley or

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.

TAGO 763B