MISCELLANEOUS ADJUSTMENTS
12V
AND
5V
ADJUSTMENT
NOTE: Perform
12V
adjustment before
5V
adjustment.
Connect the input
of
a
DC
voltmeter
to
pin 3
of
Regulator IC
(Z2).
Adjust
the 12.0V
Adjust
Control (Rl0) for 11.9V.
Connect the
input
of
a
DC
voltmeter
to
pin 3
of
Regulator IC
(21).
Adjust
the
5V
Adjust
Control
(R5)
for 5.0V.
HORIZONTAL AND VERTICAL CENTERING
Type and run the following Basic program to produce a rec·
tangle on the
Monitor
screen:
10
CLS: FOR X =0 TO
127
20
IF X>47 THEN
40
30
SET
(O,X):
SET (127,X)
40
SET
(X,O):
SET (X.47)
50
NEXT X
60
GOTO
60
Adjust
the Horizontal Center Control
(R20)
and Vertical
Center Control
(R21)
to center the rectangle on the
Monitor
screen.
ROM
SELECT SHUNT (23)
Rom Select Shunt
(Z3)
is set up in accordance to whether
Level I
or
Level
II
Basic ROMs are installed. Use the follow·
ing chart to determine which pins are shunted.
Z3
LEVEL I
LEVEL
II
PINS
BASIC
BASIC
1·16
Open
Shunted
2-15
Shunted Shunted
3-14
Open
Shunted
4·13
Shunted
Shunted
5-12
Open Shunted
6·11
Shunted
Shunted
7-10
Shunted Shunted
8-9
Open Shunted
RAM SELECT SHUNT (271)
RAM Select Shunt
(Z71)
Is set up in accordance
to
the
amount
of
RAM memory
(4K
or 16K) installed on
CPU
Board.
Use the following chart to determine which pins are
shunted.
Z71
4K
16K
PINS
RAM
RAM
1-16
Open
Shunted
2-15
Shunted Open
3-14
Open Shunted
4-13
Shunted Open
5-12
Open Shunted
6-11
Shunted
Open
7-10
Open
Open
8-9
Open Open
PIN
1
Z2C
CASSETTE MODIFICATION COUNTER BOARD
20
5.0V(A)
A
Howard
W.
Sam.
lilii·AIIii-d31
Photo
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