LINK Systems Microlink - Manual (Page 24)

MicroLink: Operator Interface Terminal
Manual Revision 1.0 4/20/99 A-1
Figure A.1: Mounting Screws on Plug on
Board
Figure A.2: Location and Orientation of Firmware
APPENDIX A. INSTALLATION OF MICROLINK FIRMWARE
Firmware for the MicroLink display and MultiSet system is contained on an integrated circuit (also
called a chip) within the MicroLink display. Please follow the instructions listed below for replacing the
MicroLink firmware.
1. Remove all power from the MicroLink display. Changing firmware with the power on will damage
the unit. Warning! The connectors from the back access cover to the air valve and slide motor
starter carry 120 VAC! Be certain that power is also removed from all of these sources.
2. Remove the two screws from the back access panel of the MicroLink operator terminal, and carefully
tilt the back access panel outward. Disconnect the ribbon cable that is plugged into the circuit board on
the back access panel.
3. Unscrew the four screws on the small board inside
the display, and unplug the board. See Figure A.1.
4. Locate the integrated circuit (chip) labeled “801-A”,
“801-B”, or “801-C” and note the location of the notch
on this chip. Gently, remove the chip that is being
replaced. See Figure A.2.
5. Insert the new integrated circuit (chip) carefully to
avoid damaging any of the pins on the chip. Verify
that the notch on the chip is as shown in Figure A.2
and that the correct socket has been used.
6. Plug the small board onto the main board. The
mounting holes on the small board must line-up
exactly with the metal standoffs. If they are not aligned then remove the small board and move it to
obtain the correct alignment. Screw each of the four screws into the board once the appropriate
alignment is obtained. Refer to Figure A.1 again.
7. Connect the ribbon cable to the board on the
back access cover. Be sure to line-up the
polarizing tab on the ribbon cable connector with
the slot on the board connector.
8. Put the access cover back into place and add the
two screws to it.