CHATTANOOGA
GROUP INC.
General Service Procedures
Preventing damage to the case
The plastic case of the Intelect units is quite durable, as are the
membrane switch overlays. To remove the screws and open the case for
servicing it will be necessary to place the unit upside down. Be sure the work
surface is covered so that the unit isn’t scratched. Also be careful with tools
that may scratch the case or overlays.
Location of screws
There are 6 screws that hold the case together and all of them are
accessible from the bottom of the unit. These screws are distinguished from
others on the bottom in that they are all recessed into the plastic case.
Remove all 6 screws.
Opening the Case
Flip the unit back over and carefully lift the top of the case off the
bottom. The top of the case can be opened from the left and put on the right
side of the bottom without disconnecting the cables. If you do need to remove
any cables, NOTE THE ORIENTATION of these cables BEFORE unplugging
them because pin 1 is not marked on all the PC Boards. Mark the cable or
connector and the board before unplugging with a permanent marker, tape or
other means if you need to. You will also need to make note of which small 2-
wire connector is for the fan and which is for the beeper. If these become
swapped when assembling the unit, the beeper will sound continuously
whenever the power is on.
Special Tools
Almost any operation can be performed without any special tools. If
you need to replace the EPROMs or PALs on any of the boards, you
MUST
use a special tool to remove the parts. Attempting to remove these IC’s in
any other way can damage the socket and make the entire circuit board
unusable. The preferred tool is Burndy QILEXT-1, sold by Newark Electronics
as type 290N, P/N 95F3004.
Closing the case
Re-assemble the unit taking care to properly install any cables you may
have disconnected. When lowering the top down onto the bottom, be careful
not to capture any wires in the edge of the case. If you are having difficulty it
may be necessary to align one side of the case and then force the other side
to align. Also notice that the metal plates on either side must align with plastic
structures inside the case. After all this work look around the edge of the case
one last time to be sure everything looks OK. Now the back panel may have
fallen into the cabinet while aligning the top and bottom - don’t panic.
Carefully lift the rear edge of the top just enough to allow you to pull the panel
back into its slot in the top and bottom of the case.
Hold the unit together and flip it over (once again be sure the table is
covered so that the case isn’t scratched) and put the 6 screws back in place.
Don’t overtighten the screws, tighten them just until the edges of the case
seat together.
Innovation starts here
TM
9
Intelect
®
Legend Series Service Manual
