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HP HP-97 User Manual
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Component-Level
Maintenance
HP-97
4-10.
LOGIC
PCA
OPERATIONAL
TEST
4-11.
This
test
is
used
to
identify
faulty
integrated
circuits
on
the
logic
PCA.
It
is
comprised
of
the
following
separate
tests,
which
should
be
run
in
the
order
shown:
a.
Initial
test.
b.
Program
memory
test.
c.
Functional
test.
NOTE:
If
an
integrated
circuit
is
replaced,
the
diagnostic
test
part
two
must
be
run
on
the
completed
calculator
before
shipment.
4-12,
INITIAL
TEST
4~13.
To
run
this
test:
a.
Set
switches
as
follows:
OFF
IHIM
ON
TRACE
MAN
HHII
NORM
PRGM
HHII
RUN
b.
Enter
the
key
sequence
of
table
4-2.
After
each
keystroke,
compare
the
number
in
the
calculator
display
to
that
in
the
DISPLAY
column.
If
they
are
not
the
same,
one
of
the
ROM's
indicated
by
number
in
the
ROM
FAILURE
column
is
probably
faulty.
Replace
these
ROM's
in
the
order
indicated;
after
each
replacement,
return
to
the
beginning
of
the
test
and
run
it
again,
replacing
addtional
ROM's
as
indicated
until
the
number
in
the
calculator's
display
agrees
with
that
in
the
DISPLAY
column.
c.
Compare
the
calculator
printout
to
the
PRINTOUT
column
of
table
4-2.
If
they
are
not
identical,
replace
(one
at
a
time)
ROM
5,
ROM
0,
and
the
PIK
chip
until
the
proper
printout
is
obtained
when
the
entire
initial
test
is
run
after
each
replacement.
(ROM
contents
are
described
in
table
4-3.)
4-14,
PROGRAM
MEMORY
TEST
4-15.
To
run
the
program
memory
test,
follow
the
procedures
detailed
in
the
flowchart
of
figure
4-2.
3-8
65
67
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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