Radio Shack TRS-80 26-3650

5-2. Troubleshooting
TROUBLE
CHECK
POINT
SOLUTION
SAVE
impossible
Open
circuit
of
jack
cable.
Replace jack
cable.
Check
the
LSI
terminal
signals.
If signals
are
normal,
replace
the LSI.
Head
of
the
cassette
tape.
Clean
the head.
LOAD
impossible
Output
level of
tape
recorder.
Turn
the
volume
control to
max.
Check
to
see if
there
is an
open
circuit in
jack cable.
Replace jack
cable.
Does
the
tape
recorder
function
properly?
Test
the cassette
recorder
with
a
tape
of
music.
Clock
pulse.
Replace
crystal
oscillator.
Signal C3
of
the LSI.
Shaping
circuit.
If
C3
is
normal,
replace
the
LSI.
Remote
control
impossible
Click sound
of
the relay at
saving
or loading.
If
click cannot
be
heard,
check
signal C1
of
the
LSI.
If signal C1
is not
output
from
the
LSI,
replace the
LSI.
If
C1
is
normal,
remote control
circuit
may
be faulty.
Check
to
see
if there is
no open
circuit
in jack cable.
Replace
jack
cable.
Clock pulse.
Crystal
oscillator.
No
function
at
all
Is
PC
-4
properly
connected?
Connect
correctly.
Poor contact
of
connector.
Replace
connector.
Clock
pulse.
Crystal
oscillator.
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