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Commodore 1541 - Page 27

Commodore 1541
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Troubleshooting-Part
1
The
procedures
apply
to
both
the
VIC-1541
and
the
1541.
The
locations
of
P4
and
P8
have
changed
and
the
reference
designators
have
changed.
Some
gates
of
IC's
have
also
changed.
If
you
are
troubleshooting
the
1541,
be
sure
to
cross
reference
the
designators
and
pin
numbers
given
with
those
in
the
table
in
this
appendix.
For
example,
Step
9
of
Troubleshooting
instructs
the
user
to
short
pin
10
of
P6
to
pin
10
of
UF2E.
After
converting
the
designators,
the
user
would
short
pin
1
of
P6
to
pin
12
of
UBL
• FAILURE
TO
CROSS REFERENCE DESIGNATORS
AND
PIN
NUMBERS
MAY
RESULT
IN
DAMAGE
TO
YOUR
1541.
Troubleshooting-Part2
The
procedures
apply
to
both
the
VIC-1541
and
the
1541
and
may
be
used
by
converting
the
reference
designators
and
pin
numbers.
Also
note
the
changes
described
under
Theory
of
Operation.
Many
of
the
test
points
on
the
VIC-1541
are
not
available
on
the
1541
because
they
are
inside
UCl.
Disregard
these
test
points
and
any
reference
to
them.
Page
F-3

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