Model 7475A
Section V
SECTION V
PRODUCT HISTORY
5-1. INTRODUCTION
5-2.
This section describes the differences between earlier models of the
HP
7475
and the latest version documented
in
this
manual. These earlier models are identified by their serial prefix number,
and
the
date codes on their printed-
circuit assemblies (PCAs). For ease of reference this section is divided into two major topics; History of Serial Prefix
Numbers
and
History of Printed Circuit Assemblies.
5-3. HISTORY OF ASSEMBLIES BY SERIAL PREFIX NUMBER
5-4.
Table
5-1
is
a quick-reference table
that
lists, by plotter serial prefix number, the assemblies
that
differ from
those documented in this manual. Also referenced are Item Numbers under which these differences are described in this
section.
5-5.
Table
5-2
lists
the
assemblies
that
are described under each Item.
5-6.
Knowing the serial prefix number of
the
plotter, the user
can
see
in
Table
5-1
which assemblies are documented
in
this
section.
In
Table
5-2
the user
can
see
if
more
than
one change
has
been made to the assembly
in
question
and
which Items
in
this section to refer to.
Table
5-1.
Assemblies by Plotter Serial Prefix Number
SIN
PREFIX ASSEMBLIES ITEM
2325A
Al
MainPCA
See PCA History
Chassis Assembly
5
NOTE
Assemblies designated with
an
asterisk
(*)
denote changes
made during the plotter production cycle.
Table
5-2.
Item Description
ITEM
ASSEMBLIES
5 Main Chassis
Pinch Roller Arm (Left)
5-7. HISTORY OF PRINTED CIRCUIT ASSEMBLIES
5-8.
Hewlett-Packard's printed-circuit assemblies have three major identification features:
a.
Part
Number.
All PCAs
having
the
same
part
number are directly interchangeable.
If
a PCA is revised
in
any
way
that
makes
it
non-interchangeable with previously issued PCAs, a new
part
number
is
assigned to the
revised PCA.
b.
Revision
Letter.
This letter identifies the most recent revision to
the
etched circuit pattern. The original issue is
identified with
the
letter 'A'.
If
the master artwork for a PCB is revised
in
order to alter performance or
manufacture, the revision letter is changed to the next letter in the alphabetical sequence.
5-1
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