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7970B/7970C
Replaceable Parts
SECTION VI
REPLACEABLE PARTS
6-1.
INTRODUCTION.
6-2.
This section provides information for ordering re-
placement parts for the tape transport of the HP 7970B/
7970C Digital Magnetic Tape Units.
6-3.
This section contains assembly parts lists, support-
ing illustrations, ordering information, and a part number
cross reference.
6-4.
ASSEMBLY PARTS LIST.
6-5.
The assembly parts list presents a breakdown of all
replaceable parts of the tape transport. The information
contained in the lists are under the following headings:
a. FIGURE & INDEX NO.
b. PART NUMBER.
c. DESCRIPTION.
d. UNITS PER ASSY.
6-6.
FIG URE AND INDEX NUMBER.
6-7.
The figure and index number column identifies the
figure that illustrates each listed item .and the index number
that identifies the item on the illustration.
6-8.
PART NUMBER.
6-9.
The part number column provides the Hewlett-
Packard part number for each item listed in the assembly
parts list.
6-10.
DESCRIPTION.
6-11.
The description column describes the items within
the equipment. An indented column arrangement is used to
show the relationship between a part and the parts next
higher assembly. The top assembly of each listing appears in
Part 2
indention 1. Primary subassemblies (of the top assembly)
and attaching parts appear in indention 2. This method of
indention is continued through indention 3, 4, etc, until all
replaceable parts are listed. Attaching parts are listed im-
mediately following the part they attach. Attaching parts
are identified by the abbreviation (AP) enclosed in paren-
thesis at the end of the description.
6-12.
Reference designation and manufacture informa-
tion (if applicable) is also included in the description col-
umn.
6-13.
UNITS PER ASSEMBLY.
6·14.
The quantity shown in the units per assembly col-
umn reflects the total quantity of a part required by the
next higher assembly of that part. This quantity is not neces-
sarily the total used for the complete equipment. The ab-
breviation AR is used to indicate usage as required of a
particular item. The abbreviation REF is used to indicate
that the quantity of an item used per assembly is listed in
the next higher assembly of the assembly parts list.
6-15.
ORDERING INFORMATION.
6-16.
To order replacement parts, address the order or
inquiry to the local Hewlett-Packard Sales and Service Office.
(Refer to the list at the end of this manual for addresses.)
Specify the following information for each part ordered.
a. Identification of the unit, kit, or assembly con-
taining the part.
b. Hewlett-Packard part number for each part.
c. Description of each part.
d. Circuit reference designation (if applicable).
6-17.
PART NUMBER CROSS REFERENCE.
6-18.
Table 6-1 at the end of this section provides a
cross reference between Hewlett-Packard part numbers and
manufacturer's part numbers.
6-1
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