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PRELIMINARY SERVICE
CHECKS
(Continued)
SERVICE
CHECKS
(?)
JOYSTICKS
Type
in
and
run the
(A)
Joystick
does
not work,
following
program:
10
FORX
=
0TO3
20
Y
= JQYSTK(X)
30
NEXT
X:
GOTO
10
While
the
program
is
running
check
for
pulses
at
pins 19
and 39
of
PIA
IC
(IC7).
If
pulses
are miss-
ing,
check
IC7
by
substitution.
(B)
if
pulses
are present
at
pins 19
and
39
of
IC7,
check
for
pulses
at
pin
11 of
Decoder
IC
<IC1
1).
If
__
the pulses are
missing
at
pin
11
of IC11,
check
(9_)
IC11
by
substitution.
(C)
If
pulses
are present
at
pin
11 of
IC11,
check
for
pulses
at
pins
4 thru
9
of
PIA
IC
(IC2).
If
the
pulses
are missing,
check
IC2 by
substitution.
(D)
If
pulses
are present
at
pins 4 thru
9
of
IC2,
check
DAC
IC
(IC3)
by
substitution.
(E)
Joystick buttons
do
not
work.
Check
the
joystick
buttons
for
continuity.
Also
check
joystick
Connectors JK1 and
JK2
for
good
con-
nections.
(F)
If
the joystick
buttons
and connectors
are
good,
check PIA
IC
(IC7)
by
substitution.
SERIAL
I/O
PORT
(A)
Serial port
does
not work.
Check
PIA
IC
(IC2)
and
SALT
IC
(IC1)
by
substitution.
POWER
UP
GENERAL
OPERATING INSTRUCTIONS
CASSETTE OPERATION
The Computer
will
come
up
in
Basic
mode when
turned
On
with
no
cartridge
in
the
slot.
If
a
cartridge
is
installed,
the
Computer
will
come
up
running
the
program
in
the
cartridge.
RESET
The Computer
will
be Reset
by pressing
the
Reset button
(SW2)
located
on
right
rear of cabinet.
BASIC
PROGRAMS
A
Basic
program
in
the
Computer
RAM
can be
started
by
typ-
ing
RUN
and
then pressing the
ENTER
key.
The program
can
be stopped
by pressing the
BREAK
key
or the
Reset
button.
Connect
a cassette recorder
to
the Cassette
Socket
(JK4)
on
the
Computer
using the cable furnished with the
Computer.
Plug the black plug
on
the cable
into
the
Earphone
jack,
the
large
gray plug
into
the
Auxiliary jack
and
the small gray plug
into
the
Remote
On/Off
jack
on
the Recorder.
To
load
a program from
cassette, put the
Recorder
in
Play
mode
with the
volume
turned
about
half
way
up.
Type
CLOAD
and
then press the Return
key.
The
letter
S
will
ap-
pear
on
the
Monitor screen
while the
Computer
searches
for
the
program.
When
the
Computer
finds the
program,
the
let-
ter
F
will
appear on
the
screen
and
the
word
OK
will
appear
after
the
program
has
been
loaded.
To
save a
program
to cassette,
put the
Recorder
in
the
Record mode.
Type
CSAVE
and
then press the Return
key.
The word
OK
will
appear on
the
Monitor screen
after
the
pro-
gram
has been saved
and
the
Recorder
will
shut
Off.
DISASSEMBLY INSTRUCTIONS
CABINET
REMOVAL
Remove
sfx Phillips
screws from
cabinet bottom.
Turn
Computer
right
side
up and remove
cover.
MAIN
BOARD REMOVAL
board.
Remove
six Phillips
screws
holding
Main
board
to
cabinet
base and remove
board.
Remove
shield
from
bot-
tom
of
Main
board by removing
17
clips that
attach
it
to
the
board.
POWER TRANSFORMER REMOVAL
Carefully
disconnect keyboard cable from
Main
board
and
Unplug
Power
Transformer from Main
board.
Remove
two
remove
Keyboard.
Unplug
Power
Transformer from Main
Phillips
screws
holding
Power
Transformer
to
cabinet base.
MISCELLANEOUS ADJUSTMENTS
CLOCK
ADJUST
Connect
the input
of
a frequency counter
to pin 7 of
SAM
IC
(IC22).
Adjust the Clock
Trimmer
(TC1)
for
a
frequency
of
3.579545MHz.
RF
MODULATOR
Connect Computer
to
a
TV
Monitor.
Set the
TV
and
the
Channel
Select
Switch (SW3)
to
Channel
4.
Type
in
and
run
the following
program:
10
SOUND
200,200:
GOTO10
t
Adjust the
Channel
4
Coil for
best
picture
and
sound. Ad-
just
the
sound
coil
for
best
sound
with
minimum
noise.
Set
the
TV
and
the
Channel
Select
Switch
SW3
to
Channel
3.
Adjust the
Channel
3
Trimmer
for
best
picture
and
sound.
VI
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