14 — Keyboard
14–4
CX20/CX30/CX34 Service Manual
An operator overlay is adhered to the keyboard on which is printed function key,
numeric and blank legends. The blank legend positions can be overwritten with
wax crayon by the operator to match data programmed by the operator. A
protective plastic cover is fitted in front of the keyboard. A programming overlay,
printed with programming key data, is supplied loose. When programming is
required the programming overlay is placed in front of the keyboard, behind
protective cover.
14.2
Testing
The keyboard is check–scanned during power–up.
14.3
Servicing
WARNING
HIGH VOLTAGES EXIST INSIDE THE UNIT. BEFORE
REMOVING THE COVER, ENSURE THAT MAINS POWER
IS DISCONNECTED COMPLETELY. EXCEPT WHERE
SPECIFIED IN THESE PROCEDURES, DO NOT APPLY
POWER TO THE UNIT WHEN THE COVER IS REMOVED.
Caution
Tactile membrane switches can be easily damaged until
fixed to a rigid backing. DO NOT operate unless lying on
a flat smooth surface. Take care not to bend membrane
in switch areas when removing backing paper and fixing
in position.
14.3.1
Removing a keyboard (CX20/CX30)
To remove a keyboard from CX20/CX30, proceed as follows:
1
Switch off machine and isolate it from the mains power supply.
2
Remove unit case (refer to Section 3).
3
Disconnect keyboard/main PCB flying connector (jumper cable from
PL4) at vendor side of case.
4
Release plastic bezel covering keyboard by pulling upper edge away
from case.
5
Disconnect earth strap from inside case by removing the screw and two
washers (either side of earth strap): retain earth braid (case to power
utility bracket).
6
Peel off keyboard (with plastic sheet) from cover and completely
remove by pulling keyboard connector and earth strap through slot in
cover.
Summary of Contents for CX20 SERIES
Page 258: ...PL 1 CX20 CX30 CX34 Service Manual Section PL Parts List ...
Page 284: ......
Page 287: ......
Page 317: ...Addendum A Phase 1 4 and CX34 Parts List A 30 CX20 CX30 CX34 Addendum A ...
Page 318: ......
Page 321: ......
Page 323: ...Contents B 2 Addendum B ...
Page 343: ...Addendum B Phase 1 5 1 5 3 and New Main PCB B 22 Addendum B ...
Page 344: ......
Page 347: ......
Page 351: ...PL Parts List Devlin Keyboard C 6 Addendum C ...
Page 352: ......