Service Administrative Support
463X
HARD
COPY
MOTOR
IMPROVEMENTS
Ref:
November
20,
1981
Wizard
Workshop
article
11
463X:
Hard
Copy
Unit -
Maintenance
of
D.C.
Motors"
The
1~7-0039-01
motors
used
in the
463X
dry
silver
t:opi
ers
have
recently
been
improved.
•
An
o-ring seal
is
now
being
used
around
the output shaft
of
the
gearhousing to
reduce
leakage of
lubricant.
• A thicker gearhousing
cover
is
also
being
used
to
reduce
leakage.
Some
motors
have
been
seen
with
two
of
the thinner covers ,
one
mounted
on
top
of
the other.
•
The
cut
on
the
wonn
gear
has
been
changed
to
reduce
heat
and
friction.
These
changes
to the
motor
do
not
affect
specifications, inventory,
documentation,
etc.
Therefore, the
part
number
of
the
motor
does
not
change.
The
effective
lot
code
for all the
above
improvements
is
LW
(December,
1983).
For
an
explanation of the
coding
of
these motors, please refer to
the
above
referenced
arti
cl_
e.
w2
Issue
13-21
468
NEW
FAN
FILTER
REDUCES
OPERATING
TEMPERATURE
Serial
Numbers:
All
Ref:
468
Service
Manual,
Vol.
II1
Figure
2-122
A new
Air
Filter
for
the
468
is
now
being
used
that
reduces
the
internal
ambient
temperature
by 4
degrees
Centigrade.
As a
result
of
the
decrease
in
temperature,
the
instrument
will
have
increased
reliability.
The
part
number
for
the
new
filter
is
378-2042-02.
-14-
October,
1883
laaue
31
PLAN
OF
ACTIOH:
All
old
filters
(378-2042-00)
are
to
be
purged.
Every
468
that
comes
in
for
service
either
under
warranty
or
billable
that
has
the
old
filter
is
to
have
the
new
filter
installed
at
no
cost
to
the
customer.
ROTE:
When
the
new
filter
is
installed,
it
is
possible
to
see
a
faint
image
of
the
fan
and
the
fan
mounting
screws.
When
the
denser
old
filter
is
installed,
nothing
can
be
seen
behind
it.
w2
Issue
13-17
613
HIGH
VOLTAGE
MODIFICATION
#50474
Customer
Serv~ce
has
implemented
a
modification to
613
high
voltage
boards
to
improve
reliability
and
performance.
As
a result
of
this
mod,
the
613
high
voltage
board
part
number
rolls
from
670-2308-06
to
670-2308-09.
The
restorer diodes
CR51
and
CR62
have
failed readily especially
when
being
soldered
with
a
high
wattage iron (see
reference
above
for
details).
To
correct
this,
their
part
number
is
being
changed
from
152-0242-00
to
152-0107-03.
The
high
voltage capacitors
Cl32, Cl41,
Cl42,
C151,
C152,
C161
and
Cl62
have
al
so
shown
poor
reliability.
On
occasion,
their
failure
has
destroyed a
CRT
by
producing
a
phosphor
burn. This
situation
is
improved
by
changing
the
part
numbers
of these capacitors
from
283-0101-00
to
283-0477-00.
The
-0477-
is
a distinctive blue capacitor similar
to those recently
modified
into the
611.
)J
w2
Issue
13-17
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