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Service Manual
HP Model 6631B
System DC Power Supply
For instruments with Serial Numbers:
HP 6631B: US37470101 and up
HP Part No. 5962-8202 Printed in U.S.A.
Microfiche No 5962-8203 June, 1998
1
Warranty Information
CERTIFICATION
Hewlett-Packard Company certifies that this product met its published specifications at time of shipment from the
factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States
National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities
of other International Standards Organization members.
WARRANTY
This Hewlett-Packard hardware product is warranted against defects in material and workmanship for a period of
three years from date of delivery. HP software and firmware products, which are designated by HP for use with a
hardware product and when properly installed on that hardware product, are warranted not to fail to execute their
programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery.
During the warranty period Hewlett-Packard Company will, at its option, either repair or replace products which
prove to be defective. HP does not warrant that the operation for the software firmware, or hardware shall be
uninterrupted or error free.
For warranty service, with the exception of warranty options, this product must be returned to a service facility
designated by HP. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products
returned to HP for warranty service. Except for products returned to Customer from another country, HP shall pay
for return of products to Customer.
Warranty services outside the country of initial purchase are included in HP's product price, only if Customer pays
HP international prices (defined as destination local currency price, or U.S. or Geneva Export price).
If HP is unable, within a reasonable time to repair or replace any product to condition as warranted, the Customer
shall be entitled to a refund of the purchase price upon return of the product to HP.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the
Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the
environmental specifications for the product, or improper site preparation and maintenance. NO OTHER
WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. HP SHALL
NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.
ASSISTANCE
The above statements apply only to the standard product warranty. Warranty options, extended support contacts,
product maintenance agreements and customer assistance agreements are also available. Contact your nearest
Hewlett-Packard Sales and Service office for further information on HP's full line of Support Programs.
2
Safety Summary
The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply
with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture,
and intended use of the instrument. Hewlett-Packard Company assumes no liability for the customer's failure to comply with
these requirements.
WARNING
Servicing instructions are for use by service-trained personnel. To avoid dangerous electrical shock, do not perform any
servicing unless you are qualified to do so. Some procedures described in this manual are performed with power supplied to
the instrument while its protective covers are removed. If contacted, the energy available at many points may result in personal
injury.
BEFORE APPLYING POWER.
Verify that the product is set to match the available line voltage, the correct line fuse is installed, and all safety precautions
(see following warnings) are taken. In addition, note the instrument's external markings described under "Safety Symbols"
GROUND THE INSTRUMENT.
Before switching on the instrument, the protective earth terminal of the instrument must be connected to the protective
conductor of the (mains) power cord. The mains plug shall be inserted only in an outlet socket that is provided with a
protective earth contact. This protective action must not be negated by the use of an extension cord (power cable) that is
without a protective conductor (grounding). Any interruption of the protective (grounding) conductor or disconnection of the
protective earth terminal will cause a potential shock hazard that could result in personal injury.
FUSES
Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used. Do not
use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.
KEEP AWAY FROM LIVE CIRCUITS.
Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by
qualified service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous
voltages may exist even with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and
remove external voltage sources before touching components.
DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.
Any adjustment, maintenance, and repair of this instrument while it is opened and under voltage should be avoided as much as
possible. When this is unavoidable, such adjustment, maintenance, and repair should be carried out only by a skilled person
who is aware of the hazard involved.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized
modification to the instrument. Return the instrument to a Hewlett-Packard Sales and Service Office for service and repair to
ensure that safety features are maintained.
SAFETY SYMBOLS
Refer to the table on the following page
WARNING The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not
correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign
until the indicated conditions are fully understood and met.
Caution The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not
correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do
not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.
Safety Symbol Definitions
3
Symbol Description
Direct current
Alternating current
Both direct and alternating current
Three-phase alternating current
Earth (ground) terminal
Protective earth (ground) terminal
Frame or chassis terminal
Terminal is at earth potential (Used for measurement and control circuits designed to be
operated with one terminal at earth potential.)
Terminal for Neutral conductor on permanently installed equipment
Terminal for Line conductor on permanently installed equipment
On (supply)
Off (supply)
Standby (supply)
Units with this symbol are not completely disconnected from ac mains when this switch
is off. To completely disconnect the unit from ac mains, either disconnect the power
cord or have a qualified electrician install an external switch.
In position of a bi-stable push control
Out position of a bi-stable push control
Caution, risk of electric shock
Caution, hot surface
Caution (refer to accompanying documents)
4
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 furnishing, 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, reproduced, or translated into another language without the prior written
consent of Hewlett-Packard Company.