43
Trouble Shooting
PROBLEM
CAUSE
SOLUTION
The belt still
tracks to the
right.
The solenoid valve is not
working properly or the
electric eye is not working.
The electric photo eye light
beam is not hitting the
reflector.
.
1. Remove the right side cover, exposing the tensioning
piston and top roller.
2. Remove the back door on the model 3760 or 4375.
3. Turn the air control to the “on” position. Remove the
abrasive sanding belt. With the motor in the “off” position,
place your hand in between the reflector and the eye. This
will block the invisible beam.
Check to see if tracking piston is extended. If it is, then that
means that there is something wrong with the eye.
(Example: fake signal, misaligned, dirty)
You should hear the solenoid click on and off. If you do not,
either the eye’s invisible light beam is not getting to and
from the reflector or the solanoid valve is not working or the
eye is not working.
Check if the light beam is hitting the reflector. Complete the
following steps to ensure the light beam is hitting the
reflector:
Place a reflective surface against the lense of the photoeye.
If there is still no clicking heard and piston action seen,
move the reflector in front of the eye. If the eye is bador the
solanoid is bad, test both with a volt meter or 110 volt test
light. ONLY A LICENSED ELECTRICAN SHOULD
COMPLETE THE FOLLOWING TEST.
1. Disconnect power from the machine. Remove the
electrical box cover. Place a screw in one corner of the
cover with the cover back facing towards you. Screw the
cover corner to the electrical box corner facing the rear.
2. Reconnect power to the machine.
CAUTION: Do not touch any bare wires with hands or
any un-insulated tools. Serious electrical shock may
occur.