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HP HP-97 User Manual
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APPENDIX
C
Service
Cards
C-1.
INTRODUCTION
C-2.
The
HP-97
is
a
powerful
and
complex
electronic
device
containing
many
components,
including
nine
IC's
which
are
used
by
the
calculator's
internal
programming
in
a
sophisticated,
systematic
manner.
Accordingly,
the
HP-97
is
liable
to
malfunction
due
to
faults
in
one
or
more
of
a
number
of
components
(primarily
the
IC's).
Identifying
which
of
these
IC's
is
responsible
for
a
particular
malfunction
can
be
costly
(in
both
parts
and
labor)
if
the
trial-and-error
approach
to
troubleshooting
is
used
on
this
complex
calculator.
C-3.
Fortunately,
this
inherent
sophistication
enables
the
calculator
effectively
to
perform
diagnostic
trouble
shooting
upon
itself,
with
the
aid
of
suitable
programmed
procedures.
Use
of
them
will
expedite
the
diagnostic
process
of
isolating
a
calculator
malfunction
to
a
particular
IC
failure.
C-4,.,
The
following
magnetic
cards
are
required
to
conduct
certain
test
procedures
in
this
manual:
a.
Program
memory
test
program
card.
b.
Functional
test
program
card.
c.
Data
card
1.
d.
Data
card
2.
e.
Diagnostic
test,
part
one,
program
card.
f.
Diagnostic
test,
part
two,
program
card.
C-5.
These
cards
should
be
prepared
by
writing
onto
them,
using
either
an
HP-97
or
an
HP-67,
the
program
or
data
given
in
the
remainder
of
this
appendix.
134
136
Table of Contents
Cover
1
Contents
4
I. General Information
9
Introduction
9
Description
9
Compatibility
9
Identification
10
Standard Accessories
11
Optional Accessories
11
II. Theory of Operation
15
HP-97 Logic
15
Display
16
Performing a Function
18
Timing
18
Program and Data ROM
19
Printer
20
Print Head Drivers
21
Printer Motor Control
21
Print Intensity Control
22
Card Reader
22
Power Supply
23
Battery Charging
24
Power-On Reset
24
III. Assembly-Level Maintenance
27
Introduction
27
Recommended Tools and Fixtures
28
Individual Key Sequence Tests
28
Full Operational Test
32
Initial Test
33
Program Memory Test
33
Functional Test
34
Keyboard Test
36
Diagnostic Test
38
HP-97 Assembly Removal and Replacement Procedures
40
IV. Component-Level Maintenance
59
Introduction
59
Recommended Tools and Fixtures
59
Logic PCA Troubleshooting
60
Power Supply Troubleshooting
60
Faulty Function Verification and Repair
60
Logic PCA Operational Test
66
Initial Test
66
Program Memory Test
66
Functional Test
70
Printer Assembly Maintenance
83
Printer Mechanical Maintenance
83
Printer Electrical Maintenance
86
Keyboard Troubleshooting
90
Display Troubleshooting
90
Cathode Driver IC Replacement
91
Card Reader Troubleshooting
96
V. Accessories
117
Introduction
117
HP 82033A Battery Pack
117
AC Adapter/Recharger
117
HP 82044A Security Cable and Lock
118
HP 82037A Reserve Power Pack
118
VI. Replaceable Parts
121
Introduction
121
Ordering Information
121
Appendix A: Improper Operations
129
Appendix B: Symbols and Abbreviations
131
Appendix C: Service Cards
135
Introduction
135
Program Memory Test Program Card
136
Functional Test Program Card
136
Data Card 1
138
Data Card 2
138
Diagnostic Test Program Cards
139
Appendix D: Service Notes
143
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HP HP-97 Specifications
General
Brand
HP
Model
HP-97
Category
Calculator
Language
English
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