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HP HP-97 User Manual
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HP-97
Theory
of
Operation
2-U48.
When
the
power
is
applied,
Q1
is
turned
off.
VSS
rises
and
the
voltage
across
C3
also
rises,
resetting
the
ACT.
If
VB
drops
a
certain
level
below
VSS,
Q1
turns
on
and
discharges
C3,
forcing
the
ACT
to
reset
again.
This
sequence
repeats
until
VB
and
VSS
are
stable,
thereby
eliminating
the
effect
of
ON-OFF
switch
contact
noise.
AC
Adapter/
Recharger
|
|
|
|
|
|
|
|
T
[_“7\,
!
|
=
i
|
;
—>
|
|
|
|
|
|
|
|
Voo)
Figure
2-10.
Battery
Charging
Circuit
T——Z(To
ACT)
=ac3
(To
Vso)
Figure
2-11.
Power-On
Reset
Circuit
2-11/2-12
24
26
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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