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9153A-7
SERVICE
NOTE
Supersedes:
None
9153A
APPLIES 10:
All
Units:
X
Only
Units
on
Agreement:
Immediately:
At Pry/Normal
Call:
Disc
Drive
On Failure:
X
Information
Only:
WARRANTY:
EXTENDED
Serial number:
LABOR:
See Text
All
PARTS:
See Text
TRAVEL:
See
Text
Power
Supply
Failure
Weakens
or
Return for Update:
Use as is:x
Damages
Other
Assemblies
:
Return
for Salvage:
See
Text:
WARRANTY EXTENDED UNTIL:
are ter
Situation:
A power
supply
failure
has been
seen
that
applies
30 Volts
to the
12 Volt
line
of
the
9153A.
In all
cases
this
failure
mode
has
also
caused
damage
to
the
3.5
inch
winchester
mechanism.
In
addition,
components
of
the
3.5 Inch
flexible
drive,
the
fan
and
the
main
controller
PCA
are
stressed
above
their
design
limits.
The
failure
mode
has
been,
"the
fan
running
at
a
greatly
accelerated
rate"
and
"a loud
pop
and
the
smell
of
smoke".
In cases
where
these
symptoms
or
other
component
damage
occurs
in
conjunction
with
a defective
power
supply,
the
+12 Volt
test
point
on the power
supply
should
be checked.
If approximately
30V
is present
at
this
point,
the
following
assemblies
need
to be
changed
to assure
the product
will
not
fail
at a later
date
due
to stressed
components.
. Controller
PCA PN09153-69502
. Power
Supply
PN09153-69501
. 3.5
Inch
Flexible
disc
Drive
PN09114-6951)
. 3.5
Inch Winchester
Drive
PN09153-69111
. Fan
PN09125-68500
Solution:
The
extent
of
the
damage
involved
when
the
power
supply
fails
in
this
manner
makes
the
repair
impractical
to
perform
in
the
field.
The
repair
cost
would
be
higher
than
the
manufacturing
cost
of
a new
unit.
In cases
where
+12
Volts
has
been
verified
to be at
approximately
+30 Volts,
Greeley
Division
will
authorize
a
warranty
replacement
for
the
customer
unit.
Contact
the Greeley
Division
Support
line,
telephone
303-350-4453,
to
get
instructions
for
obtaining
a
replacement
unit.
Warranty:
KK
10/28/85
Po Packar
y"
Prefecture,
Japan
229.
1983
Hewlett-Packard
Company
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