Jumpers On The Main Logic Board; Keyboard Pcb; Facit 4431 Selection (W2); National Keyboard Selection (W4,5,6) - Facit 4431 Service Instruction

6
3.5 JUMPERS ON THE MAIN LOGIC BOARD
Jumper W1. With jumper W1 inserted, +5V is app-
lied to the I/0 connector pin 18.
Jumper W3. This jumper makes it possible to
choose either 2716 or 2732 as character genera-
tor (D40). See Fig 3.3 for details.
Jumper W4. Inserted Test mode, (factory test
only).
Jumper W5. Inserted EROM Write Enable.
3.5.1 KEYBOARD PCB
Two groups of jumpers are fitted to the keyboard
PCB.
3.5.1.1 Facit 4431 Selection (W2)
Jumper W2 on the keyboard PCB must be fitted for
Facit 4431 operation. Jumper W1 is not fitted.
O
SPKR
VOL
ADT
W1 W2
:I'~
SET UP BREAK
3.5.1.2 National Keyboard Selection (W4,5,6)
Jumpers W4, W5 and W6 on the keyboard PCB are
used to select which country the keyboard is for
use in. Jumper W3 is not fitted. The table below
shows the possible combinations. The keyboard
will be supplied set to one particular configu-
ration with appropriate keytops fitted. If a
change is made to the jumper settings the key-
tops should also be changed (and a new character
generated ROM fitted).
Country
U.S. (ASCII)
Sweden/Finland
Germany
Denmark
Britain
Spain
France
Norway
E
W4 WS
0
C::::>
I l l
W4
Down
Up
Up
Down
Down
Down
Up
Up
Jumper
W5 W6
Down
Down
Down
Down
Up
Down
Up Down
Up
Down
Down Up
Up Up
Down Up
FIG 3. 2
Keyboard PCB Jumper Locations
3.5.2 MAIN LOGIC PCB
There are 4 jumpers fitted to the main logic
board as shown in Fig 3.3.
3.5.2.1 +5V on I/0 Connector Pin 18 (W1)
Pin 18 on the I/0 connector may be linked to +5V
by fitting jumper W1. +5V on pin 18 is required
by the Facit 5165/66 Current Loop Adapter. When
the jumper is not fitted pin 18 is connected in-
ternally.