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2-1

9000A-006 Service

Section 2

Theory of Operation

INTRODUCTION

2-1.

This section contains two block diagram descriptions of the Asynchronous Signature
Module housed within the case of the 9000A Series Troubleshooter. The first block
diagram description is general; it describes the operating concept of the Signature Module
and its relationship to the Troubleshooter and UUT. The second block diagram description
covers the module in greater detail.

GENERAL OPERATION

2-2.

The main function of the Signature Module is to receive streams of digital data from the
UUT and generate a test result that the Troubleshooter can display as a four- character
hexadecimal value (signature). During operation in the signature mode, the
Troubleshooter uses the data probe to read the data appearing at the test nodes of the UUT,
and it uses the Clock Module to obtain the START, STOP, CLOCK, and ENABLE control
signals.

The START, STOP, and ENABLE signals (plus the pod SYNC signal if selected) establish
a gate time, and generate CLOCK pulses during the gate time. The START, STOP, and
ENABLE signals synchronize the measurement period to the data being read from the
UUT by the data probe. The selected START signal specifies the beginning of the
signature measurement interval (gate time), which should coincide with the beginning of
the test pattern being stimulated within the UUT.

During the measurement interval, the data probe feeds test data through to the data input
of the Signature Module, which accepts the data into three separate sections:

1. CRC (signature) section

2. Events section

3. Waveform section

When the selected STOP edge occurs, the gate time concludes, leaving registers in the
CRC section loaded with the signature of the clocked-in test data, registers in the events
section loaded with the number of selected transitions, and the waveform section registers
loaded with a binary representation of the last 640 nanoseconds of probe data. The
contents of these three sections are available over the pod bus for display by the
Troubleshooter.

Содержание 9000A-006

Страница 1: ...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 ...

Страница 2: ... 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...

Страница 3: ...RIPTION 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 3 MAINTENANCE 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 ...

Страница 4: ... TABLE OF CONTENTS continued SECTION TITLE PAGE 3 15 Test Setup Defective Unit UUT 3 5 3 16 Taking Signatures with the Test Troubleshooter 3 6 4 LIST OF REPLACEABLE PARTS 4 1 5 SCHEMATIC DIAGRAMS 5 1 TABLE OF CONTENTS 5 1 ...

Страница 5: ...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 ...

Страница 6: ...9000A 006 Service iv ...

Страница 7: ...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 2 A2 Clock Module PCA 5 11 ...

Страница 8: ...9000A 006 Service vi ...

Страница 9: ... 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 per...

Страница 10: ... 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 ...

Страница 11: ...ulated 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 Tape 1 6 The Asyn...

Страница 12: ...edance 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 D...

Страница 13: ...802 interface pods PROGRAM CONTROL All functions of the Asynchronous Signature Probe Option can be commanded from within a 9010A or 9005A user program All data measured by this option may be tested in the program A test program controlling the 9020A may command all option functions and retrieve measured data ENVIRONMENTAL Storage 40 to 80 degrees C RH 75 non condensing Operating 0 to 50 degrees C ...

Страница 14: ...9000A 006 Service 1 6 ...

Страница 15: ...P and ENABLE signals plus the pod SYNC signal if selected establish a gate time and generate CLOCK pulses during the gate time The START STOP and ENABLE signals synchronize the measurement period to the data being read from the UUT by the data probe The selected START signal specifies the beginning of the signature measurement interval gate time which should coincide with the beginning of the test...

Страница 16: ...nals to set up the gate section in accordance with the setup selections previously made on the Troubleshooter Clear the gate section the CRC section the events section and the waveform section then arm the gate section in preparation for the START and STOP signals required to clock in the data from the data probe Place the status of the module on the pod bus during the gate time and when the STOP ...

Страница 17: ...Interface Pod as a control signal The main function of the gate section is to provide gated CLOCK signals to the CRC and events registers The source of the CLOCK signals may be the clock lead of the Clock Module or the pod SYNC signal depending upon the selection made during the setup of the Troubleshooter for signature operation The control section causes the gate section to select the correct so...

Страница 18: ...rom UUT via Clock Module 15 START lead START signal to be SYNC signal from Interface Pod 16 STOP signal to be from UUT via Clock Module STOP lead 17 STOP signal to be SYNC signal from Interface Pod 18 ENABLE signal level to be valid high 19 ENABLE signal level to be valid low 1A CLOCK signal select rising edge overridden by op code 30 1B CLOCK signal select falling edge overridden by op code 30 1C...

Страница 19: ...shooter as a waveform The output of the shift register is 4 bits one nibble wide and is available to the Troubleshooter via the events section the CRC section and the pod bus To read the contents of the shift register for display the Troubleshooter first reads the CRC and event sections It then commands the control section to issue the necessary shift commands to place each nibble of waveform data...

Страница 20: ...ed to the same I 0 port of the Troubleshooter and the Signature Module examines each op code placed on the pod bus by the Troubleshooter to determine if the Signature Module should turn on or if the Interface Pod should be allowed to respond FIGURE 2 2 Control Section Block Diagram ...

Страница 21: ... signal sent as a result of delaying the MAINSTAT signal satisfies these requirements With the main decoder U18 U17 enabled each op code placed on the pod bus by the Troubleshooter and latched clocked into the receive buffer U4 is decoded to a specific Signature Module function Two of the decoded functions op codes 1x and 2x enable the second decoder U11 and U12 That is whenever an op code is rece...

Страница 22: ...d The source for the CLOCK signal may be the clock lead EXT CLOCK of the Clock Module or the pod SYNC signal The source for the ENABLE signal may be the enable lead EXT ENAB of the Clock pod or the logic high always enabled The control signal sources are selected by the four control lines designated START SOURCE STOP SOURCE ENAB SOURCE and CLOCK SOURCE from the control section The four control lin...

Страница 23: ...l applied to the clock gate The clock gate remains enabled until the selected STOP signal occurs and the stop flip flop U48B changes state to inhibit the enable gate U49 The enable gate inhibits the clock gate and halts the generation of gated CLOCK pulses The output of the stop flip flop is also fed to the control section as a status line back to the Troubleshooter Once the STOP edge has been rec...

Страница 24: ...ourth as gated CLOCK signals occur To provide the CRC action of the register four outputs are taken from the registers These outputs are fed through exclusive or gates and clocked through pipeline registers back to the feedback gating circuit formed by U21 U25 and U20 The feedback gating is necessary to achieve the standard CRC signature result from the probe data and gated CLOCK pulses The pipeli...

Страница 25: ...el input of the CRC register providing a means for the event count data to be shifted through to the transmit buffer U3 located in the control section As shown in Figure 2 5 the input to the counter is selected from GATED CLK EDGED CLK GATED HI or VALID HI by l of 4 selector U19 The selected input to the counter is determined by the EVENT GATED FREE and EVENT CLK HI signals from the control sectio...

Страница 26: ...igh level data samples registers U27 U28 U55 and U56 receive low level data samples but are clocked 180 degrees out of phase and 20 nanoseconds apart The effect of this parallel but out of phase register arrangement is a doubling of the effective operating speed That is the data can be clocked at double the 25 MHz speed of the registers since each register is clocked at the clock speed but 1 80 de...

Страница 27: ...2 13 9000A 006 Service FIGURE 2 6 Waveform Section Block Diagram ...

Страница 28: ...ol section generates the MSTEP signal to shift the waveform registers the event count registers and the CRC registers By shifting the registers with the MSTEP signal the waveform data passes through the event count and CRC registers to the transmit buffer When the Troubleshooter executes a next read command op code 80H the data appearing at the input of the transmit buffer is latched into the buff...

Страница 29: ...m 3 Using the procedures and packaging and bench techniques that are recommended The Static Sensitive S S devices are identified in the Fluke technical manual parts list with the symbol The following practices should be followed to minimize damage to S S devices 1 MINIMIZE HANDLING 2 KEEP PARTS IN ORIGINAL CONTAINERS UNTIL READY FOR USE 3 DISCHARGE PERSONAL STATIC BEFORE HANDLING DEVICES USE A HIG...

Страница 30: ...PEN EDGE CONNECTOR EXCEPT AT STATIC FREE WORK STATION PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS TO PROTECT INSTALLED SS DEVICES 9 HANDLE S S DEVICES ONLY AT A STATIC FREE WORK STATION 10 ONLY ANTI STATIC TYPE SOLDER SUCKERS SHOULD BE USED 11 ONLY GROUNDED TIP SOLDERING IRONS SHOULD BE USED A complete line of static shielding bags and acces sories is available from Fluke Parts Department Tele...

Страница 31: ...it board The use of surface mount devices prevents the use of conventional desoldering and soldering techniques during repair operations The removal and installation of surface mount devices requires the correct use of a heat gun and fluxing techniques Do not attempt printed circuit board repair unless you are skilled in SMD repair techniques MOS Considerations 3 5 CAUTION Static discharge can dam...

Страница 32: ...ottom side 2 Carefully return the instrument to the upright position while holding the top cover in place Once the instrument is in the upright position remove the top cover and lay it to the right side of the instrument exposing the Signature Module as shown in Figure 3 1 3 If it is necessary to remove the module from the base assembly of the Trouble shooter proceed as follows a Remove the three ...

Страница 33: ...ace Pod depends on the Signature Module for the passage of handshaking signals MAINSTAT and PODSTAT and data between itself and the Troubleshooter Because the signature module is electrically inserted in the handshaking data path to the Interface Pod there is a failure mode of the Signature Module that can render a good Interface Pod non operational The failure mode occurs when the control section...

Страница 34: ...NATURE TROUBLESHOOTING PROCEDURES 3 12 Getting Started 3 13 The most efficient method of locating faults within the Signature Module is to employ a second Troubleshooter hereafter referred to as the test Troubleshooter equipped with the Asynchronous Signature Option to read signatures at various points on the module During the signature reading operation the Troubleshooter in which the defective m...

Страница 35: ... These levels can be traced through the clock module and the gate section and measured as signatures Meanwhile the same opcodes are latched and decoded by the control section to generate additional logic waveforms which can also be measured as signatures The second stimulus program number 2 running in the 9000A with the suspected defective option operates as follows The data shift path is repeated...

Страница 36: ...aking Signatures with the Test Troubleshooter 3 16 Taking signatures at various test nodes of the defective module the UUT in this case requires completion of the following steps 1 Connect the Clock Module leads of the test Troubleshooter to the 40 pin DIP clip on the defective module as listed in Table 3 3 2 Load and run program 0 on tape side A Initialize Program Set up the test Trou bleshooter ...

Страница 37: ...er disabled Transition count gated or load register 8 with 5000520 and run program 12 then l 5 Connect the Data Probe of the defective unit Attach the Data Probe tip to pin 10 on the DIP clip and attach the Data Probe ground lead to pin 1 on the DIP clip 6 The clock module in the defective unit is not used disconnect it from the DIP clip and troubleshooter 7 Load and run stimulus program 2 on side...

Страница 38: ...9000A 006 Service 3 8 ...

Страница 39: ...y to support one to five instruments for a period of 2 years This list presumes an availability of common electronic parts at the maintenance site for maintenance for I year or more at an isolated site it is recommended that a least one of each assembly in the instrument be stocked HOW TO OBTAIN PARTS 4 2 Components may be ordered directly from the manufacturer by using the manufacturer s part num...

Страница 40: ...nstrument is available for the factory This kit contains those items listed in the REC QTY column for the parts lists in the quantities recommended Parts price information is available from the John Fluke Mfg Co Inc or its representative Prices are also available in a Fluke Replacement Parts Catalog which is available upon request CAUTION Indicated devices are subject to damage by static discharge...

Страница 41: ... 89536 758599 1 MP 2 SPACER HEX BRASS 6 32X5 8 MALE FEMALE 757427 89536 757427 1 MP 3 SPACER HEX BRASS 6 32X3 4 MALE FEMALE 757435 89536 757435 2 MP 4 BRACKET CONNECTOR 760033 89536 760033 1 MP 5 CABLE TIE 6 3 4 L 0 190 W 1 75 DIA 104265 06383 SST 25 1 MP 6 ACCESSORY KIT 764928 89536 764928 1 R RES CF 39K 5 0 25W 442400 80031 CR251 4 5P39K 1 1 TM 1 9000A 006 OPERATORS MANUAL 773259 89536 773259 1 ...

Страница 42: ...9000A 006 Service 4 4 FIGURE 4 1 9000A 006 Final Assembly ...

Страница 43: ...4 5 9000A 006 Service Figure 4 1 9000A 006 Final Assembly cont ...

Страница 44: ...9000A 006 Service 4 6 Figure 4 1 9000A 006 Final Assembly cont ...

Страница 45: ...TTL CLOCK 756346 89536 756346 1 U 6 22 24 IC FTTL DUAL D F F EDG TRG SOIC 742163 89536 742163 5 1 U 48 50 742163 U 7 16 IC LSTTL QUAD 2 INPUT OR GATE SOIC 74O878 89536 740878 2 1 U 8 9 10 IC LSTTL 4 BIT UP DOWN CNTR SOIC 742114 89536 742114 3 2 U 11 12 IC LSTTL 8BIT ADDRSABLE LATCH SOIC 74213O 89536 742130 2 1 U 13 47 IC LSTTL DUAL D F F EDG TRG SOIC 74O985 89536 74O985 2 1 U 14 15 27 IC LSTTL 8BI...

Страница 46: ...9000A 006 Service 4 8 FIGURE 4 2 A1 Main PCA ...

Страница 47: ...8 61935 O31 1666 1 5 TABLE 4 4 A2 CLOCK MODULE PCA SEE FIGURE 4 3 N REFERENCE FLUKE MFRS MANUFACTURERS R O DESIGNATOR STOCK SPLY PART NUMBER TOT S T A NUMERICS S DESCRIPTION NO CODE OR GENERIC TYPE QTY Q E C 1 4 CAP CER 10PF 1O 5OV C0G 12O6 747311 89536 747311 4 C 5 12 CAP CER 0 O1UF 10 5OV X7R 12O6 747261 89536 747261 8 CR 1 4 DIODE I BV 7O OV I0 5OMA DUAL 742320 89536 74232O 4 1 F 1 HLDR PART FU...

Страница 48: ...9000A 006 Service 4 10 FIGURE 4 3 A2 Clock Module PCA ...

Страница 49: ...9510 IN Indianapolis John Fluke Mfg Co Inc 8777 Purdue Road Suite 101 Indianapolis IN 46268 317 875 7870 MA Bilierica John Fluke Mfg Co Inc 900 Middlesex Turnpike Building 8 Billerica MA 01821 617 663 2400 MD Baltimore 301 792 7060 Rockville John Fluke Mfg Co Inc 5640 Fishers Lane Rockville MD 20852 301 770 1570 MI Detroit John Fluke Mfg Co Inc 33031 Schoolcraft Livonia MI 48150 313 522 9140 MN Bl...

Страница 50: ...855 35293 Ecuador Proteco Coasin Cia Ltda P O Box 228 A Ave 12 de Octubre 2285 y Orellana Quito Ecuador Tel 2 529684 TLX 393 2865 Proteco Coasin Cia Ltda P O Box 9733 Ave Principal No 204 y Calle Segunda Urbanizacion Miraflores Guayaquil Ecuador Tel 4 387519 Egypt and Sudan Electronic Engineering Laison Office P O Box 2891 Horreya Heliopolis Cairo Egypt Tel 2 695705 TLX 927 22782 England Fluke GB ...

Страница 51: ...di Arabia Electronic Equipment Marketing Co P O Box 3750 Riyadh Saudi Arabia Tel 1 477 1650 TLX 201120 Singapore Republic of Rank O Connor s PTE Ltd O Connor House 98 Pasir Panjang Road Singapore 0511 Republic of Singapore Tel 4737944 TLX 786 RS21023 South Africa Fluke S A Pty Ltd Wynberg Park 777 Andries Street Wynberg South Africa Tel 11 786 3170 TLX 960 424328 Spain ESSA Equipos y Sistemas S A ...

Страница 52: ...ue S A Tel 9568131 TLX 842 695414 Greece Athens Hellenic Scientific Representations Tel 7211140 TLX 863 219330 Hong Kong Wanchai Schmidt Co H K Ltd Tel 8330 222 TLX 780 74766 India Bangalore Hinditron Services Pvt Ltd Tel 33139 TLX 953 845741 India Bombay Hinditron Services Pvt Ltd Tel 8121316 TLX 953 112326 India New Delhi Hinditron Services Pvt Ltd Tel 640380 TLX 953 316458 Indonesia Jakarta Pus...

Страница 53: ...n 5 Schematic Diagrams TITLE PAGE Figure 5 1 A1 Main PCA 5 3 Table 5 1 Signature Module Signatures with Stimulus Program 1 5 9 Table 5 3 Signature Module Signatures with Stimulus Program 2 5 10 Figure 5 2 A2 Clock Module PCA 5 11 ...

Страница 54: ...9000A 006 Service 5 2 ...

Страница 55: ...9000A 006 Service 5 3 Figure 5 1 A1 Main PCA ...

Страница 56: ...9000A 006 Service 5 4 Figure 5 1 A1 Main PCA ...

Страница 57: ...9000A 006 Service 5 5 Figure 5 1 A1 Main PCA cont ...

Страница 58: ...9000A 006 Service 5 6 Figure 5 1 A1 Main PCA cont ...

Страница 59: ...9000A 006 Service 5 7 Figure 5 1 A1 Main PCA cont ...

Страница 60: ...9000A 006 Service 5 8 Figure 5 1 A1 Main PCA cont ...

Страница 61: ...0 9B8A U18 11 7F75 Table 5 1 Signature Module Signatures For Program 1 cont NODE SIG NODE SIG NODE SIG NODE SIG NODE SIG NODE SIG NODE SIG NODE SIG NODE SIG NODE SIG U18 12 D239 U18 13 900C U18 14 5B9B U18 15 494E U18 16 929C U19 1 0000 U19 2 9009 U19 8 0000 U19 14 98C9 U19 16 929C U20 1 9C87 U20 2 9D85 U20 4 9D04 U20 5 A439 U20 6 36A5 U20 7 0000 U20 14 929C U22 1 928C U22 7 0000 U22 13 928C U22 1...

Страница 62: ...57 3 2DD8 U57 4 2DD8 U57 5 6496 U57 6 6496 U57 7 494E U57 8 0000 U57 10 494E U57 11 DFA2 U57 12 DFA2 U57 13 96EC U57 14 96EC U57 15 0000 U57 16 494E U58 3 96EC U58 4 96EC U58 5 DFA2 U58 6 DFA2 U58 7 494E U58 8 0000 U58 10 0000 U58 ll 8238 U58 12 8238 U58 13 CB76 U58 14 CB76 U58 15 0000 U58 16 494E U59 3 CB76 U59 4 CB76 U59 5 8238 U59 6 8238 U59 7 494E U59 8 0000 U59 10 0000 U59 11 ACF5 U59 12 ACF5...

Страница 63: ...9000A 006 Service 5 11 Figure 5 2 A2 Clock Module Assembly ...

Страница 64: ...9000A 006 Service 5 12 ...

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