ELEMENTARY
TROUBLESHOOTING
There are a variety of
symptoms
that
your
PET
may
exhibit
when
it
is
not
working
properly. Here are a
few
examples: the
RETURN
key may not
work;
every
alternate key may not
work;
the screen display may be
jittery:
the
number
of
"bytes
free" may change: the
PET
may
not
respond
at
ail.
This section describes some
rudimentary
troubleshooting
procedures
that
vou can
follow
to check internai cable
connections
in the
PET
and to check for a
faulty
memory
chip.
First. here are
a
few
simple procedures vou should
follow
before opening
up
the case of the PET:
If
Vou
power
up and get no response, be sure the
PET
is
plugged
into
an
electrical outlet. If
it
is
plugged in, turn
power
off,
wait
a
few
seconds,
then
turn
power
back
on.
Try this a
number
of times
until
vou
get
a
response.
If the screen becomes Jittery or
PET
BASIC misreacts
intermittently,
the
PET
unit
may
be
overheated. If vou
cannot
cool the room temperature,
vou
will
have
to
turn
the
PET
off
for
awhile
(you
wililose
whatever
infor-
mation
is
in
memory
when
vou
turn
it
off).
The problem may
not
be in the
PET
hardware at ail. There may
be
pro-
gram errors, or
"bugs,"
in the
PET
BASIC interpreter or in the program
vou are running.
Internai Cable Connections
This
is
the procedure to open the
PET
and check for secure
positioning
of
cable connections. The specifie items described are in the
compact
keyboard
PET.
Follow the same general procedure
for
full size keyboard
PETs.
1.
Turn the
power
off
and
unplug
the
PET.
2.
Move
the
front
of
the
PET
out
from the
supporting
surface
so
that
vou
can see the four retaining screws on the
bottom.
With
a screwdriver,
unscrew
the
four
retaining screws, placing
them
in a secure location.
3.
Lift
the cover ail the
way
up, being careful
not
to move
it
so far back
that
it
pulls any of the cords.
4.
Locate the
supporting
rod on the left side in back of the tape cassette
Push the rod up
to
disengage
it
from its holder, then move
it
forward
and secure
it
in the back
screwhole
on the left side. This hoIds the
PET
cover up so vou have both hands free. (The
supporting
rod
is
shown
in
place in Figure 2-12.)
42
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