Fluke 9000A-006Async_SignatureProbeService 电路.pdf

9000A-006 ASYNCHRONOUS SIGNATURE PROBE Service Manual P/N 783944 MAY 1986 1986, John Fluke Mfg. Co., Inc. All rights reserved. Litho in U.S.A. WARRANTY COVERAGE Fluke warrants the 9000A-006 Asynchronous Signature Probe to be free from defects in material and workmanship under normal use and service for a period of one (1) year from the date of shipment. This warranty extends only to the original purchaser and does not apply to any product that has been misused, altered, or has been subjected to abnormal conditions of operation. Flukes obligations under this warranty is limited to repair or replacement of a product that is returned to an authorized Service Center within the warranty period, provided that we determine that the product is defective. If we determine that the failure has been caused by misuse, alteration, or abnormal conditions of operation, or if the warranty period has expired, we will repair the Probe and bill you for the reasonable repair cost. SERVICE If a failure occurs, send the product, postage prepaid, to the closest Service Center with a description of the difficulty. Repairs will be made or the product replaced, and it will be returned, transportation prepaid. Fluke assumes NO risk for damage in transit. DISCLAIMER THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS, OR ADEQUACY FOR ANY PARTICULAR PURPOSE OR USE. FLUKE SHALL NOT BE LIABLE FOR AND SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT, TORT, OR OTHERWISE. GETTING ANSWERS AND ADVICE To enhance your use of this Product, Fluke will be happy to answer your questions about applications and use. Address all correspondence to: JOHN FLUKE MFG. CO., INC., P.O. BOX C9090, EVERETT, WASHINGTON 98206, ATTN: Sales Department. European customers should contact FLUKE (Holland) B.V., P.O. BOX 5053, 5004 EB, TILBURG, THE NETHERLANDS. JOHN FLUKE MFG. CO., INC., P.O. BOX C9090, EVERETT, WASHINGTON 98206 i(continued on page ii) 9000A-006 Service Table of Contents SECTIONTITLEPAGE 1INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-1.PURPOSE OF THE EQUIPMENT . . . . . . . . . . . . . . . . . . 1-1 1.2EQUIPMENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . 1-2 1.3.General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.4.The Clock Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.5.The Asynchronous Signature Module . . . . . . . . . . . . . . . 1-3 1-6.The Cassette Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1-7.ORGANIZATION OF THIS MANUAL . . . . . . . . . . . . . . 1-3 1-8.SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-1.INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-2.GENERAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-3.DETAILED BLOCK,DIAGRAM DESCRIPTION . . . . . . 2-5 2-4.Clock Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 2-5.Control Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 2-6. Gate Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 2-7.CRC Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 2-8.Events Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 2-9.Waveform Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 3MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-1.INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2.REQUIRED PERFORMANCE TEST EQUIPMENT . . . . 3-1 3-3.REPAIR PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-4.SMD Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-5.MOS Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-6.DISASSEMBLY PROCEDURE . . . . . . . . . . . . . . . . . . . . 3-2 3-7.PRELIMINARY TROUBLESHOOTING . . . . . . . . . . . . . 3-3 3-8.Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3-9.Module or Troubleshooter Faulty? . . . . . . . . . . . . . . . . . 3-3 3-10.Module or Interface Pod Faulty? . . . . . . . . . . . . . . . . . . . 3-3 3-11.Disconnecting the Signature Module . . . . . . . . . . . . . . . 3-3 3-12.SIGNATURE TROUBLESHOOTING PROCEDURES . . 3-4 3-13.Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3-14.How the Stimulus Programs Work . . . . . . . . . . . . . . . . . 3-5 9000A-006 Service ii TABLE OF CONTENTS, continued SECTIONTITLEPAGE 3-15.Test Setup, Defective Unit (UUT) . . . . . . . . . . . . . . . . . . 3-5 3-16.Taking Signatures with the Test Troubleshooter . . . . . . . 3-6 4LIST OF REPLACEABLE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 5SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 TABLE OF CONTENTS 5-1 iii 9000A-006 Service List of Tables TABLETITLEPAGE 1-1.Asynchronous Signature Probe Option Specifications . . . . . . . . . . . 1-4 2-1.Signature Module Op Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 3-1.Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2.UUT Test Setup, Control/Gate Sections . . . . . . . . . . . . . . . . . . . . . . 3-6 3-3.Test Troubleshooter Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 4-1.9000A-006 Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4-2.A1 Main PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 4-3.Clock Module Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 4-4.A2 Clock Module PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 5-1.Signature Module Signatures (with Stimulus Program 1). . . . . . . . . 5-10 5-2.Signature Module Signatures (with Stimulus Program 2). . . . . . . . . 5-11 9000A-006 Service iv v 9000A-006 Service List of Illustrations FIGURETITLEPAGE 1-1.Elements of the Asynchronous Signature Option . . . . . . . . . . . . . . . 1-2 2-1.Signature Module, General Block Diagram . . . . . . . . . . . . . . . . . . . 2-3 2-2.Control Section Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 2-3.Gate Section, Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 2-4.CRC Section, Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 2-5.Events Section, Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 2-6.Waveform Section, Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 3-1.Location of Asynchronous Signature Module . . . . . . . . . . . . . . . . . 3-2 4-1.9000A-006 Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 4-2.A1 Main PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 4-3.A2 Clock Module PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10 5-1.A1 Main PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 5-2A2 Clock Module PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11 9000A-006 Service vi 1-1 9000A-006 Service Section 1 Introduction PURPOSE OF THE EQUIPMENT1-1. Signature troubleshooting supplements the basic functions of the Troubleshooter. This method of troubleshooting is used in situations where the test functions of the Troubleshooter alone do not provide adequate results. This situation usually exists when a fault occurs in a circuit area that operates asynchronously with respect to the processor. In this case, the troubleshooter cannot detect the fault since it is able to examine only processor-synchronous events. Although the Troubleshooter may not have “visibility” or access into some areas of the UUT, it is usually able to stimulate all functional areas in a consistent and repetitive manner, This type of stimulus is required to take meaningful signatures. The ability of the Troubleshooter to stimulate the UUT makes it an effective tool for signature-type fault isolation methods. The Asynchronous Signature Option 9000A-006 provides additional Troubleshooting capability for the 9000A series Troubleshooters by using signature-type fault-isolation, events counting, and test-node waveform capture. Control signals from the UUT establish the signature and allow asynchronous operation with respect to the microprocessor bus cycle, i.e., the Pod. The Asynchronous Signature Option takes signatures at UUT test nodes operating at clock speeds up to 20 MHz. For counting events, the number of data transitions appearing at the probe are accumulated up to a total of 16,777,215. A waveform display feature permits the Troubleshooter to display a representation of the data appearing at the data probe. The waveform feature is useful for determining the time interval between two signal transitions. The waveform displayed shows the last 640 nanoseconds of data received by the probe before the signature-gathering operation is terminated. The display shows logic high, logic low, and tri-state levels. During troubleshooting operations, the Troubleshooter display notifies the operator of all test conditions and values. The basic functions of the Troubleshooter, in conjunction with a suitable Interface Pod, provide the necessary stimulus for the UUT during signature troubleshooting operations. All of these features may be accessed while operating the Troubleshooter in the immediate mode by using the keyboard and display. All features may also be accessed by the use of test programs that pass control and test results through registers. 9000A-006 Service 1-2 EQUIPMENT DESCRIPTION1-2. General1-3. As shown in Figure 1-1, the Asynchronous Signature option consists of the Asynchronous Signature Module mounted within the Troubleshooter case, a separate Clock Module that connects to the Troubleshooter, and operating programs contained on a magnetic tape cassette. (For the Model 9020A, programs are executed from within the host computer.) FIGURE 1-1. Elements of the Asynchronous Signature Option 1-3 9000A-006 Service The Clock Module1-4. The Clock Module provides interface and protection between the Troubleshooter and the UUT. Interface is required to effectively connect the sources of the clock, start, stop, and enable signals located on the UUT to the input of the Troubleshooter. A fuse in the ground line provides the necessary protection. An input to the Troubleshooter from the Clock Module provides an indication of the fuse condition. The Clock Module connects to the Troubleshooter with a 15-pin connector located below the front panel of the Troubleshooter. Connection to the UUT is made by up to five clip leads that protrude from the Clock module. A clip lead is provided for each of the control signal inputs (start, stop, clock, and enable), and one is provided for the ground connection to the UUT. The Asynchronous Signature Module1-5. The Asynchronous Signature Module is a printed circuit board located within the Troubleshooter. It accepts the start, stop, clock, and enable signals from the Clock Module, and the data stream from the Troubleshooter data probe. The Asynchronous Signature Module uses these inputs to generate the corresponding signature, event count, and waveform data. The module sends the calculated signature and event count over the pod bus to the Troubleshooter for display on the front panel. In addition to the signature and events count functions, a set of registers within the module stores the latest 640 nanoseconds of the data stream gathered by the data probe. The module sends this data to the Troubleshooter for display on the front panel as a waveform. The Cassette Tape1-6. The Asynchronous Signature Option in the models 9005A and 9010A is operated by a series of programs contained on a magnetic tape cassette. Once the programs are loaded into the Troubleshooter RAM, operation of the Troubleshooter in the signature mode is afforded by several front panel keys. Appropriate displays provide the necessary interaction between the Troubleshooter and the operator during signature operations. Operation of the 9020A is a function of the host computer or instrument controller. ORGANIZATION OF THIS MANUAL1-7. This manual documents the Asynchronous Signature Option. The manual provides information for service personnel (Maintenance). Operational and programming procedures for the basic 9000A Series Troubleshooter are documented in the appropriate manual(s). Note Information for operating and programming the Asynchronous Signature Probe is available in a separate manual. Order John Fluke Part Number 773259. SPECIFICATIONS1-8. Table 1-1 lists the specifications for the Asynchronous Signature Probe Option. 9000A-006 Service 1-4 TABLE 1-1. Asynchronous Signature Probe Option Specifications SYNCHRONIZATION AND CONTROL Start Event:A selectable positive or negative edge on the Start line, or the Sync signal from the Interface Pod (when used). Stop Event:A selectable positive or negative edge on the Stop line, or the Sync signal from the Interface Pod (when used). Clock Event:A selectable positive or negative edge, or a combination of both, on the Clock line; or the Sync signal from the Interface Pod (when used). Enable Event:A selectable positive or negative level on the Enable line. ELECTRICAL Start, Stop, Clock, and Enable lines (through Clock Module): Impedance:10 pF/44 kilohms nominal Threshold:1.4 volts Overvoltage:15 volts maximum Clock Module ground lead is fuse-protected Data Channel:Uses standard data probe supplied with 9000A mainframe TIMING Maximum Frequency: Start, Stop, Clock, and Enable Signals: 20 MHz (50% duty cycle) Data Signals:10 MHz (50% duty cycle) Clock (if stop counter or both-edge modes are used): 10 MHz (50% duty cycle) Timing Requirements: Data setup: 20 ns(Data to be valid at least 20 ns before selected clock edge.) Data hold: 20 ns(Data to be valid at least 20 ns after selected clock edge.) Start/Stop setup: 25 ns(Start or Stop to be valid at least 25 ns before selected clock edge.) Enable setup: 20 ns(Enable to be valid at least 20 ns before selected clock edge.) Enable hold: 5 ns(Enable to be valid at least 5 ns after selected clock edge.) FUNCTIONS Nodal Signatures:4-digit algorithm 1-5 9000A-006 Service Transition Counting:24 bits (0 to 16,777,216 counts) Waveform Capture:32 consecutive data samples at 20-nanosecond intervals. High, low, and invalid levels. The 32 samples terminat