Service Manuals, User Guides, Schematic Diagrams or docs for : HP disc 07942-90903_7942_7946_Disc_Tape_Service_Feb87

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HEWLETT-PACKARD

HP 7942 AND HP 7946 DISC/T APE DRIVES
SERVICE MANUAL
CERTIFICATION
Products, materials, parts, and services furnished on this order
have been provided in accordance with all applicable Hewlett-
Packard specifications. Actual inspection and test data per-
taining to this order is on file and available for examination.

Hewlett-Packard's calibration measurements are traceable to
the National Bureau of Standards to the extent allowed by the
Bureau's calibration facilities.

The Hewlett-Packard Quality Program satisfies the require-
ments of FAR 52.246-15.
rlin- PACKARD
.:~
HEWLETT

SERVICE MANUAL
7942 AND 7946
DISC/T APE DRIVES
Manual part no. 07942-90903
Microfiche part no. 07942-90803

PRINTED: FEB 1987 07942-90903
Prin ted in U.S.A. E0287

Serial Number Prefix

The main part of this manual applies directly to HP 7942 and HP 7946 Disc/Tape Drives with serial numbers prefixed 2615
and subsequent. Refer to Appendix A for serial numbers prefixed 2614 and prior.

OPTIONS COVERED
In addition to the standard models, this manual
covers the following options: 01 5 and 550.

FOR U.S.A. ONLY

The Federal Communications Commission (in 47 CFR 15.838) has specified that the fol-
lowing notice be brought to the attention of the users of this product.

FEDERAL COMMUNICATIONS COMMISSION
RADIO FREQUENCY INTERFERENCE
STATEMENT

Warning: This equipment generates and uses radio frequeucy energy and if not installed and used properly, that is, in
strict accordalllce with the manufacturer's instructions, may cause interference to radio and television reception. It has
been type test.~d and found to comply with the limits for a Class B computing disc/tape drive in accordance with the
specifications in Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such
interference ill a residential installation. However, there is no guarantee that interference will not occur in a par-
ticular install~ltion. If this equipment does cause interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the fol-
lowing measures: reorient the receiving antenna; relocate the equipment with respect to the receiver; move the equip-
ment away from the receiver; plug the equipment into a different branch circuit. If necessary, the user should consult
the dealer or 3,uthorized field service representative for additional suggestions. The user may find the following booklet
prepared by tllte Federal Communications Commission helpful: "How to Identify and Resolve Radio-TV Interference
Problems". This booklet is available from the U.S. Government Printing Office, WashingtoD, DC 20402. Stock No.
004-000-00345-4.

HEWLETT -PACKARD COMPANY
P.O. BOX 39 BOISE, IDAHO 83707, U.S.A.
PRINTING HISTORY
New editions incorporate all update material since the previous edition. Updating Supplements, which are is-
sued between editions, contain additional and revised information to be incorporated into the manual by the
user. The date on the title page changes only when a new edition is published.

First Edition .. FEB 1985
Second Edition AUG 1986
Third Edition . FEB 1987

NOTICE
The information contained in this document is subject to change without notice.

HEWLETT-PACKARD MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS
MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not be
liable for errors contained herein or for incidental or consequential damages in connection with the furnish-
ing, performance or use of this material.

This document contains proprietary information which is protected by copyright. All rights are reserved. No
part of this document may be photocopied or reproduced without the prior written consent of
Hewlett-Packard Company.

COREFILE-PARCORE

11
PREFACEI

This publication provides field service information for the HP 7942 and HP 7946 Disc/Tape Drives. The
HP 7942 consists of a 24-megabyte disc drive and a tape drive combined in a single desktop cabinet to form
an integrated disc/tape drive. The HP 7946 consists of a 55-megabyte disc drive and a tape drive combined
in a similar manner.

This publication is divided into the following parts:

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