Buffer Verification Test; Self-Test - Radio Shack TRS-80 Operation Manual

Important
Note:
Do
not turn the printer or
computer
off while
the
PTC-64
is
connected
to
them. Otherwise
invalid data
may
be
sent to the printer.
Buffer
Verification Test
Upon
power-up,
the Printer Controller automatically performs
a Buffer
verification test.
This
is
indicated
by
the
FAULT
Lamp
which
turns
ON
for a short
period of
time.
The
Lamp
will
go
OFF
if
the Buffer
Verification
test
passes.
If a
Buffer
error
exists,
however,
the
FAULT
Lamp
begins
flashing
and
a
message
such
as:
Buffer memory error detected. ..Wrote*
Read:
A A
>
A E
will
be
printed.
The
letters at
the
end
will
vary according
to the
Buffer
error
encountered.
Should
this
ever occur, disconnect
the Printer Controller
from your system and
take
it
to
a
Radio Shack
Service Center.
The
unit will
be
repaired
and
returned
to
you
as
soon
as
possible.
After the Fault
message
has been
printed,
RAM
Verification
can be repeated simply by
pressing
and
holding
the
CLEAR
Key
until
the
FAULT
Lamp
turns
ON.
Self-Test
To
ensure
that the
PTC-64
is
in
perfect
working
order,
we recommend
that
you perform
the Self-Test before printing
any
text or
programs.
To
execute
the Self-Test,
just
press
the
CLEAR
and
PAUSE
keys
at
the
same
time.
First,
the
LEDs
are tested.
The
STATUS
Lamp
will
blink Green,
then Yellow,
and
finally
Red. Then
the
FAULT
Lamp
will blink three times. Finally, the
PTC-64
Beeper
will
sound
three times and
the
following message
will
be
printed:
Radio Shack Printer Controller
v
,
r
012345G789:
5< =
>?@A6CDEFGHIJKLMNOPQRSTUUWXYZ
Verify
that the
message
is
printed correctly and
that the
LEDs
blink as described.
If
not,
disconnect
the Printer Controller
and
take
it
to
a
Radio Shack
Repair
Center.
(The
letters
v.r.
stand
for the
version and
release
of your
unit.)
Note:
When
executing the Self-Test,
do
not send data
from
the
computer
—
it
will
not
be printed.
Wait
until
the Self-Test message
has
been
printed.