(1) The cassette-present sensor is in a fixed location and has an electronic
sensitivity adjustment. The other three are mounted on adjustable brackets.
(2) Adjustments should not be necessary unless a bracket is inadvertently
bent or if a switch has been replaced. Adjust the cassette-present sensor for sensitivity
by turning the screw on the top surface until the light-emitting diode (LED) just lights.
Ensure there is no cassette in the tray, so the honeycomb diffuser decal is visible to the
sensor. The table below shows typical symptoms of misadjustment and the procedures
used in re-adjustment.
f. Establishing Home Position of Cassette Carriage. The "home" position is
similar to "park," but is only achieved when the cassette carriage is fully retracted into
the rear left-hand corner of the chassis, as would be the case with a 4-on-1 format
selection. This position is extremely important, for it serves as a reference point from
which the cassette carriage proceeds. If the reference point shifts from the factory
setting as a result of motor mechanical repairs or replacement, for example, the entire
procedure below must be done. Rarely will this be necessary however, and the
procedure can be used for less extensive repairs, such as a bent sensor bracket.
Remove the F4 motor fuse on the power supply.
Be sure "park" and "cross" position sensors are both out of the contact
(3) Turn the power on, and manually move the cassette holder to the center
and rear of the unit until the front-outside edge of the cassette holder is perfectly in line
with the rear edge of the exposure opening of the main frame.
Press the RESET button on the main central processing unit (CPU)
(5) Carefully move the park-position sensor towards the rear edge of the
main slide plate until an audible lock-in of relays is heard. Lock the sensor down
carefully at that exact position.
(6) Locate and securely fasten the bumper stop flush with the rear edge of
the main slide plate.
(7) Manually move the cassette holder toward the left side of the main slide
plate until the left-outside edge of the cassette holder is even with the left-outside edge
of the main slide plate.
Press the RESET button on the CPU board.