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SERVICE MANUAL

GPIB DC Power Supplies
Agilent Series 654xA, 655xA,
664xA, 665xA

For instruments with Serial Numbers:

Agilent Model 6541A: US36360101 and above *
Agilent Model 6542A: US36360101 and above *
Agilent Model 6543A: US36340101 and above *
Agilent Model 6544A: US36390101 and above *
Agilent Model 6545A: US36340101 and above *

Agilent Model 6551A: US36480101 and above *
Agilent Model 6552A: US36230101 and above *
Agilent Model 6553A: US36340101 and above *
Agilent Model 6554A: US36340101 and above *
Agilent Model 6555A: US36340101 and above *

Agilent Model 6641A: US36410101 and above *
Agilent Model 6642A: US36400101 and above *
Agilent Model 6643A: US36400101 and above *
Agilent Model 6644A: US36410101 and above *
Agilent Model 6645A: US36390101 and above *

Agilent Model 6651A: US36400101 and above *
Agilent Model 6652A: US36400101 and above *
Agilent Model 6653A: US36400101 and above *
Agilent Model 6654A: US36390101 and above *
Agilent Model 6655A: US36390101 and above *

* For instruments with higher serial numbers, a change page may be included.
For instruments with lower serial numbers, see Appendix A.

S1
Agilent Part No. 5959-3376 Printed in USA
Microfiche Part No. 5959-3377 September, 2000
CERTIFICATION
Agilent Technologies, Inc. certifies that this product met its published specifications at time of shipment from the factory.
Agilent Technologies, Inc. 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 Agilent Technologies, Inc. hardware product is warranted against defects in material and workmanship for a period of
three years from date of delivery. Agilent Technologies, Inc. software and firmware products, which are designated by
Agilent Technologies, Inc. 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 Agilent Technologies, Inc. will, at its option, either repair or
replace products which prove to be defective. Agilent does not warrant that the operation of 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 Agilent Technologies, Inc. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products
returned to Agilent for warranty service. Except for products returned to Customer from another country, Agilent
Technologies, Inc. shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies, Inc.'s product price, only if
Customer pays Agilent Technologies, Inc. international prices (defined as destination local currency price, or U.S. or
Geneva Export price).

If Agilent Technologies, Inc. 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 Agilent Technologies, Inc.

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. AGILENT TECHNOLOGIES, INC. 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. AGILENT
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 contracts, product
maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent
Technologies, Inc. Sales and Service office for further information on Agilent 's full line of Support Programs.

2
SAFETY CONSIDERATIONS
GENERAL. This is a Safety Class 1 instrument (provided with terminal for connection to protective earth ground).

OPERATION. 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".

WARNING.