KEI 2001 Repair 电路图.pdf

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1、 Model 2001 Multimeter Repair Manual Contains Servicing Information RadioFans.CN 收音机爱 好者资料库 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 3 years from date of shipment. Keithley Instruments, Inc. warrants the following i

2、tems for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation. During the warranty period, we will, at our option, either repair or replace any product that proves to be defective. To exercise this warranty, write or call your local Keithley represe

3、ntative, or contact Keithley headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products

4、 are warranted for the balance of the origi- nal warranty period, or at least 90 days. LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modifi cation without Keithleys express written consent, or misuse of any product or part. This warranty also does not apply to

5、 fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE

6、. THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLE AND EXCLUSIVE REMEDIES. NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDI- RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUME

7、NTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY. Keithley Instruments, Inc. 28775 Aurora Road Cleve

8、land, OH 44139 216-248-0400 Fax: 216-248-6168 CHINA:Keithley Instruments China Yuan Chen Xin Building, Room 705 No. 12 Yumin Road, Dewei, Madian Beijing, China 100029 8610-2022886 Fax: 8610-2022892 FRANCE:Keithley Instruments SARL BP 60 3 alle des Garays 91122 Palaiseau Cdex 31-6-0115155 Fax: 31-6-0

9、117726 GERMANY:Keithley Instruments GmbH Landsberger Strae 65 82110 Germering 49-89-849307-0 Fax: 49-89-84930759 GREAT BRITAIN:Keithley Instruments, Ltd. The Minster 58 Portman Road Reading, Berkshire RG30 1EA 44-01734-575666 Fax: 44-01734-596469 ITALY:Keithley Instruments SRL Viale S. Gimignano 38

10、20146 Milano 39-2-48303008 Fax: 39-2-48302274 JAPAN:Keithley Instruments Far East KK Aibido Bldg. 7-20-2 Nishishinjuku Shinjuku-ku, Tokyo 160 81-3-5389-1964 Fax: 81-3-5389-2068 NETHERLANDS:Keithley Instruments BV Avelingen West 49 4202 MS Gorinchem 31-(0)183-635333 Fax: 31-(0)183-630821 SWITZERLAND:

11、Keithley Instruments SA Kriesbachstrasse 4 8600 Dbendorf 41-1-8219444 Fax: 41-1-8203081 TAIWAN:Keithley Instruments Taiwan 1, Ming-Yu First Street Hsinchu, Taiwan, R.O.C. 886-35-778462 Fax: 886-35-778455 RadioFans.CN 收音机爱 好者资料库 Model 2001 Multimeter Repair Manual 1993, Keithley Instruments, Inc. Tes

12、t Instrumentation Group All rights reserved. Cleveland, Ohio, U.S.A. Second Printing, February 1996 Document Number: 2001-902-01 Rev. B RadioFans.CN 收音机爱 好者资料库 Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revisi

13、on Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released between Revisions, contain important change information that the user should incorporate immediately into the manual. Addenda are numbered sequentially. When a new Revision is created, al

14、l Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual. Each new Revi- sion includes a revised copy of this print history page. Revision A (Document Number 2001-902-01).April 1993 Revision B (Document Number 2001-902-01). February 1996 All

15、Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand and product names are trademarks or registered trademarks of their respective holders. Safety Precautions The following safety precautions should be observed before using this product and any ass

16、ociated instrumentation. Al- though some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by qualied personnel who recognize shock hazards and are familiar with the safety

17、pre- cautions required to avoid possible injury. Read the operat- ing information carefully before using the product. Exercise extreme caution when a shock hazard is present. Le- thal voltage may be present on cable connector jacks or test xtures. The American National Standards Institute (ANSI) sta

18、tes that a shock hazard exists when voltage levels greater than 30V RMS, 42.4V peak, or 60VDC are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring. Before operating an instrument, make sure the line cord is connected to a properly

19、 grounded power receptacle. Inspect the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use. For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test. ALWAYS remove power from the

20、entire test sys- tem and discharge any capacitors before: connecting or dis- connecting cables or jumpers, installing or removing switching cards, or making internal changes, such as install- ing or removing jumpers. Do not touch any object that could provide a current path to the common side of the

21、 circuit under test or power line (earth) ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of with- standing the voltage being measured. Do not exceed the maximum signal levels of the instruments and accessories, as dened in the specications and oper

22、at- ing information, and as shown on the instrument or test x- ture rear panel, or switching card. Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limit- ed sources. NEVER connect switching cards directly to AC main. When connecting so

23、urces to switching cards, install protective devices to limit fault current and voltage to the card. When fuses are used in a product, replace with same type and rating for continued protection against re hazard. Chassis connections must only be used as shield connections for measuring circuits, NOT

24、 as safety earth ground connec- tions. If you are using a test xture, keep the lid closed while power is applied to the device under test. Safe operation requires the use of a lid interlock. If a screw is present on the test xture, connect it to safety earth ground using #18 AWG or larger wire. The

25、symbol on an instrument or accessory indicates that 1000V or more may be present on the terminals. Refer to the product manual for detailed operating information. Instrumentation and accessories should not be connected to humans. Maintenance should be performed by qualied service per- sonnel. Before

26、 performing any maintenance, disconnect the line cord and all test cables. Table of Contents i 1Routine Maintenance 1.1 Introduction.1-1 1.2 Line fuse replacement.1-1 1.3 Current fuse replacement.1-2 1.3.1Front AMPS input fuse.1-2 1.3.2Rear AMPS input fuse.1-2 1.4 Fan filter cleaning .1-3 1.5 Firmwa

27、re updates.1-3 2Troubleshooting 2.1 Introduction.2-1 2.2 Repair considerations.2-1 2.3 Power-on test.2-2 2.4 Front panel tests.2-2 2.4.1KEYS Test.2-2 2.4.2DISPLAY PATTERNS Test.2-3 2.5 Built-in test.2-3 2.5.1AUTOMATIC Testing2-6 2.5.2MANUAL Testing.2-6 2.6 Diagnostics.2-7 2.7 R1_STB and R2_STB shift

28、 registers.2-11 2.8 Display board checks.2-14 2.9 Power supply checks.2-14 2.10 Documentation.2-15 2.10.1Display board circuit theory.2-17 2.10.2Power supply circuit theory.2-17 2.10.3Built-in test documentation .2-18 3Disassembly 3.1 Introduction.3-1 3.2 Handling and cleaning precautions.3-1 3.2.1P

29、C-board handling.3-1 ii 3.2.2Solder repairs.3-2 3.3 Special handling of static sensitive devices. 3-2 3.4 Case cover and shield removal . 3-2 3.4.1Case cover removal. 3-2 3.4.2Analog board top shield removal. 3-3 3.5 PC-boards removal .3-3 3.5.1Digital board.3-3 3.5.2A/D converter board. 3-3 3.5.3Analog board.3-4 3.6 Front panel disassembly.3-5 3.7 Cooling fan removal .3-5 3.8 Main CPU firmware replacement. 3-6 3.9 Instrument re-assembly.3-6 3.10 Assembly drawings.3-6 4Replaceable Parts 4.1 Introduction.4-1 4.2 Parts lists.4-1 4.3 Ordering information.4-1 4.4 Factory service.