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94MS41 Rev. C1 S/W Ver 2.06
Frame Transport System
The printer has two aluminum exposure frame assemblies. Vacuum for
frame evacuation is drawn through two ports in the glass; one at each of
the rear corners. The top coversheet frame is hinged in the back, with a
gas strut on each side that hold the cover-sheet frame open.
The exposure frame transport system is powered by a
motor. It is controlled and operated by the computer system, through the
nose section 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.
The frames move at two speeds; a fast speed initially, then to 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.
Frame Drive Motor Replacement
The drive motor is in the left rear corner of the cabinet. It is a
PMDC (Permanent Magnet Direct Current) 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. Refer to "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 door.
•
Disconnect the motor connector from the control box.
•
Position both frames to approximately a mid-point state.
•
Disconnect the two wire connectors at the motor end of the drive motor.
•
Remove the four
plate and lift out the motor.
•
Install the new motor in the reverse order.
Frame Drive Clutch Adjustment
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 will be too slow and a transport
error may occur. Use the following procedure to set the clutch at the
minimum setting for operation.
1
3
/
-20 x
/
" bolts that attach the motor to its mounting
4
8
1
/
-hp PMDC gear
8
1
/
-hp
8
11-3
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