Monarch Instrument 9830TM - Manual (Page 39)

9820/9830/9835 Service Manual Service Procedures
32 TC9830SM Rev. B 7/98 Confidential July 1998
5. Unlatch the bearing block latch on each side of
the platen roller by inserting a small blade
screwdriver between the latch and the platen
frame. While holding the latch out with the
screwdriver, push the bearing block up so the
latch pawl clears the hole in the platen frame.
NOTE: Remove the rivot from bearing block on
printhead latch side.
6. When both bearing blocks are unlatched, push the
platen assembly up and out of the platen frame.
CAUTION
Do not run the platen roller into the printhead or the
assemblies could be damaged.
Platen Module Replacement
1. Locate the left side of the platen frame by
locating the cable harness exit hole.
2. Turn feed assembly so the drive gear is on the
same side of platen frame as cable exit hole.
3. Position bearing blocks in the slot on each side of
frame, then push down on roller until bearing
block latches snap into place.
4. Rotate platen module clockwise to locate it in its
original position. The platen module must be
lifted up to allow the platen gear to clear the
printhead alignment bracket. Detents in the base
plate assure alignment of the platen frame.
5. Reinstall the three phillips screws and tighten.
6. Verify clearance between platen drive gear and
the stepper gear bearer, this should not have
changed for this procedure. Nominal gap for this
adjustment is factory set at .0005".
Bi-Cell Sensor Removal
1. Grasp the bi-cell sensor holder at its base,
squeeze together to release the latch tabs and lift
the back of the sensor holder upwards.
2. Release latch tabs by pulling back and up on
sensor holder.
3. Rotate sensor holder back to expose sensor
circuit board.
4. Insert the blade of a small screwdriver through
the sensor holder on the left side (about 3/8”
down from the top) and pushs the sensor board
away from the sensor housing. (apply thumb
pressure to the cover to gain leverage).
CAUTION
The recommended pushing location minimizes the
possibility for damaging the circuit card.
5. Carefully remove sensor board from sensor
holder.
NOTE: Use caution not to damage the circuit
board.
6. Unplug sensor harness from sensor circuit board
by grasping the harness by the connector.
Lower Supply Guide Removal
1. Turn printer off and unplug AC cord.
2. Remove bi-cell sensor.
3. Remove sensor harness from two retainer loops.
4. Open print module until it latches.
5. Locate locking tabs on either side of the guide
frame which lock into the platen frame.
6. With a small straight blade screwdriver, gently
pry latches in (towards the feed path) while
pushing up on guide frame until latch releases
from frame. Repeat for latch on the other side.
Bi-Cell Sensor Replacement
1. Connect sensor harness to the sensor board.
2. Insert sensor board in holder on an angle to
engage board in holder tabs.
3. Apply light pressure on the opposite side of the
board to seat board into holder.
4. Ensure sensor window is showing through the
hole in sensor holder.
5. Insert top holder tab into guide frame.
6. Pivot sensor holder assembly down and latch the
back tabs. Use your thumb to support the under
side of the guide frame.
Figure 6-8. Bi-cell Sensor
Latch
Bi-Cell Sensor