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94MS42 Rev.B1 S/W Ver 2.06
Tray Transport System
The printer has two aluminum exposure tray assemblies. Vacuum for
frame evacuation is drawn through two ports in the glass, one at each of
the rear corners. The top Mylar® frame is hinged in the back, with a gas
strut on each side that holds the Mylar® frame open.
The exposure frame transport system is powered by a
(Permanent Magnet Direct Current) gear motor. It is controlled and
operated by the control panel, through the rail cover G and S
switches.
Pressing the G switch once will start a vacuum cycle. The second
time G is pressed, the frames will move into position and an exposure
will start. The frames can be operated through a blank frame cycle by
holding down the S switch before pressing the G switch and then
releasing both.
The frames move at two speeds; a fast speed initially, then a slow speed
near the end of their travel. This prevents a noisy, hard-stop condition
and possible machine damage. For added safety, the drive motor has a
slip clutch to prevent machine damage. A system switch inside the cabinet
stops frame movement when it is actuated by the frame moving into the
exposure position. If the system switch fails, the frame contacts a second
switch that turns off power to the frame drive motor.
Tray Drive Motor Replacement
The drive motor is in the left rear corner of the cabinet. It is a
PMDC design, with a slip clutch on the output shaft. The clutch is intended
to prevent frame damage in the event of a jam or if an object blocks
frame movement. See Frame Drive Clutch Adjustment for procedures.
Note: Remove your watch when working on the drive motor. The drive
motor magnet could damage watches or similar devices.
•
Remove the left side cabinet panels.
•
Disconnect the motor connector from the control box.
•
Position both frames to approximately a midpoint state.
•
Disconnect the two wire connectors at the motor end of the drive motor.
•
Remove the four
the rear brace of the center section. Use a
out the motor.
•
Install the new motor in the reverse order.
Tray Drive Clutch Adjustment
Wb
A personnel safety hazard may exist, or machine damage
may occur if the slip clutch on the exposure frame drive motor
is set too tight. If the clutch is set too loose, the frame drive
1
1
/
-20 x
/
" counter sunk screws that attach the motor to
4
2
1
/
-hp PMDC
8
7
/
" open end wrench and lift
16
1
/
-hp
8
11-3
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