IBM Document: NCR
06/97 Doc # NCR001
Page 2 of 3
Copyright International Business Machines, 1997
All rights reserved
Procedures
Removing Top-Plate and Sub-Plate
•
Turn 7870-2000 off, remove power cord and Top-plate
•
Lift the scanner cover, then with flat-blade screwdriver
remove attaching screw, which is located on the front-
right face of the Sub-plate assembly.
•
Insert screwdriver into slot next to the retaining tab at the
front-left edge of Sub-plate and release the tab.
•
Push-up the front-end of the Sub-plate to a vertical
position then pull the back-end out from under the edge of
the Tower Cabinet and lift up and off.
•
Remove thumb screw and Scale board shield which is
located just in front and left of the scanning area
Installing Top-Plate and Sub-Plate
•
While holding the Sub-plate in a vertical position place the
rear edge under the edge of the Tower Cabinet then bring
the front-edge down until it contacts the mounting
brackets in a horizontal position and retaining tab snaps
into place in the slot within the mounting bracket’s front-
left edge.
•
Place scanner’s cover back on Sub-plate assembly and
reinsert the attaching screw into the Sub-plate.
•
Place Top-plate back on scale and apply power to verify
the display indicates “Ready 0.00 lb.”
•
Reinsert the Scale Board Shield by aligning the shield’s
tabs and attaching the thumb screw again.
Calibrate Scanner
•
Do Procedure (Removing Top-Plate and Sub-Plate)
•
Temporarily set the Top-plate back on the rubber
bumpers of the scale hinge assembly so the bumpers
reenter the locating sockets
•
Apply power to the unit again and perform the following
weight placements on the scale, however, make sure no
vibrations or movements are near scale during this
process.
•
Depress and hold Scale Zero switch on panel and note
the CAL and PAR readings then release switch.
•
Lift up the top-plate briefly and replace after depressing
the SW1 calibration switch, located underneath the just
removed scale board shield.
•
Verify display reads “Ready 0.00 lb.”
•
Press Scale Zero switch, display says Ready 5.00 lb.
•
Place 5.00 lb. weight on top-plate
•
Press Scale Zero switch, display says Ready 15.00 lb.
•
Add 10.00 lb. weight on top-plate
•
Press Scale Zero switch, display says Ready 30.00 lb.
•
Add 15.00 lb. weight on top-plate
•
Press Scale Zero switch, display says Ready 0.00 lb.
•
Remove all weights and press Scale Zero switch, display
says Scale Ready 0.00 lb.
•
Depress and hold Scale Zero switch on panel and record
the CAL and PAR readings then release switch.
•
Turn off power to unit and remove the top-plate.
•
Do Procedure (Installing Top-Plate and Sub-Plate)
•
To verify place three weights separately in the center of
the Top-plate, verify weights are within a .02 offset.
•
Place the same weight on 4 different areas on the Top-
plate, verify the weight is within a .02 offset.
Procedures (Continued)
Front Bezel Removal
•
Turn 7870-2000 off and remove power cord.
•
Locate tower cabinet at rear of scale
•
Locate two releases on each side of clear bezel glass
•
Pull bezels top edge out and down by pivoting on base
•
Disconnect cables to the status LED’s
•
Lift Bezel up and out of the tower cabinet.
Front Bezel Installation
•
Reinsert new or existing Bezel’s bottom in first.
•
Reconnect the status LED’s
•
Push back Bezel in place, verify it snapped in position
•
Reinsert power cord and restart the 7870 device
Scale Board Replacement
•
Do Procedure (Removing Top-Plate and Sub-Plate)
•
Disconnect the load cell (J1) and scale (J2) cable.
•
Remove the board screw and carefully pry three boards
retainers to release the Scale Board.
•
Insert the new board and reapply the board screw.
•
Do Procedure (Calibrate Scanner) starting on 2nd step
Digital Board Replacement
•
Do Procedure (Front Bezel Removal)
•
Jumpers stated are (Digital Board / LC-Digital Board).
•
Remove 4 screws from the sides of tower and lift straight
up, disconnect display cable (J5 / J4) if used.
•
Remove Indicator cable (J2), Speaker (J4 / J1), Scale
Cable (J3), Video Board (J1 / J5)
•
Pull out the digital board in its connector and swap the
firmware in these areas (U19, U22, U26 / U15, U18).
•
Reinsert a new Digital or LC-Digital Board.
•
Install the Video Brd. cable (J1 / J5), Scale Cable (J3),
Speaker (J4 / J1), and Indicator cable (J2).
•
Reconnect any display cables to the tower before placing
tower case back on, tighten the 4 tower screws to hold it
in place.
•
Do Procedure (Front Bezel Installation) & (Calibrate)
Fan Replacement
•
Do Procedure (Removing Top-Plate and Sub-Plate)
•
Do Procedure (Front Bezel Removal)
•
Remove 4 screws from the sides of tower and lift straight
up, disconnect display cable (J5 / J4) if used
•
Remove ground wire to optics assembly, lift forward, up
and out of unit and place upside-down on table.
•
Unplug cable (J6) from video board.
•
Squeeze output end of duct and detach then release duct
clips on video board and lift duct over (J6).
•
Slide fan out and new fan back in the same position and
make sure cable (J6) is not between duct and fan.
•
Reapply the duct clips and connect the end of the duct to
video board by squeezing it in place.
•
Reconnect (J6) to video board and place optics assembly
back in unit and tighten ground wire.
•
Reconnect any display cables to tower cabinet before
placing it back on then tighten the 4 tower screws.
•
Do Procedure (Front Bezel Installation)
•
Do Procedure (Installing Top-Plate and Sub-Plate)
