15 — CX30 TK Machine
15–5
CX20/CX30/CX34 Service Manual
15.4.3
Links
Refer to Figure 15.2.
There are four links on the keyboard controller PCB:
LK1: selects/disables power rest circuit.
LK2: connects FRAME GND to 0Vd.
LK3: selects numbers of keys – 64 large or up to 128 in any combination.
LK4: allows use of two 64–key keyboards. Used with LK3.
Figure 15.1
Keyboard Controller PCB – Communication Loom Connections
FRAMEGND
TB2
TB1
SCREEN
GN
BU
BK
OR
YL
WH
RD
LK2
PL4
+5VD
0VD
TXD
RXD
n/a
DO NOT CONNECT THIS PIN (TB2 PIN 3)
n/a
4
3
2
1
4
3
2
1
HOST
COMMUNICATIONS
Remote Keyboard
Column Mounted Keyboard
TB2
TB1
SCREEN
GN
BU
BK
OR
YL
WH
RD
LK2
PL4
+5VD
0VD
TXD
RXD
n/a
DCU SENSE
n/a
4
3
2
1
4
3
2
1
8
7
6
5
4
3
2
1
9
n/a
n/a
9
W
A
Y
RIBBON LOOM
PL3
PL3
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 ...
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Page 347: ......
Page 351: ...PL Parts List Devlin Keyboard C 6 Addendum C ...
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