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HP HP-97 - Page 111

HP HP-97
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HP-97
Component-Level
Maintenance
Table
4-15.
Card
Reader
Troubleshooting
Procedure
(Continued)
STEP
ACTION
10.
Record
any
program
on
a
blank
card.
Hold
the
card
with
tweezers
and
dip
in
Magna-see.
Allow
Magna-see
to
dry.
Measure
the
length
of
re-
cording
from
the
leading
edge
of
the
card.(Tool
155428
may
be
used.)
Try
to
write
on
a
protected
card.
Monitor
the
MTRS
pin
of
the
CRC
with
a
voltmeter
or
oscilloscope.
Insert
a
card.
Monitor
the
motor
pin
of
the
CRC.
Insert
a
card.
If
the
length,
L=5.7+-0.6
cm,
go
to
step
8.
If
not,
replace
R1
with
a
value
selected
from
table
4-10.(Each
value
of
R1
provides
for
approx-
imately
3mm
of
record
length.)
Then
return
to
step
6.
If
"ERROR"
is
displayed,
the
card
reader
is
repaired.
END
OF
TEST.
If
not,
go
to
step
13
and
perform
part
b.
Then
return
to
step
6.
If
MTRS
=
0,
go
to
step
10.
If
not,
go to
step
13.
If
MOTOR
=
0,
go to
step
11.
If
not,
replace
the
CRC.
Then
go
to
step
12.
4-43

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