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®
77 Series III
Multimeter
Service Manual
PN 800604 November 1998 Rev.1, 11/99
© 1998,1999 Fluke Corporation. All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
Table of Contents
Chapter 1
Title
Page 1-1 1-3 1-3 1-4 1-4 2-1 2-3 2-3 2-3 2-3 2-4 2-4 2-4 2-5 2-5 2-5 2-5 3-1 3-3 3-3 3-4 3-4 3-7 3-7 3-7 3-8 3-8
Introduction and Specifications ................................. 1-1. Introduction ................................................................. 1-2. Organization of the Service Manual ........................... 1-3. Conventions ................................................................ 1-4. Specifications .............................................................. Theory of Operation .................................................... 2-1. Introduction ................................................................. 2-2. Functional Block Description ..................................... 2-3. Detailed Description ................................................... 2-4. Voltage Signal Conditioning .................................. 2-5. Current Conditioning .............................................. 2-6. Ohms ....................................................................... 2-7. Additional Circuitry ................................................ 2-8. AC Converter ..................................................... 2-9. Active Filter ....................................................... 2-10. Rotary Switch ..................................................... 2-11. A/D Conversion .................................................. Maintenance ................................................................ 3-1. Introduction ................................................................. 3-2. PCA Access and General Maintenance ...................... 3-3. Display Access ............................................................ 3-4. Cleaning ...................................................................... 3-5. Performance Test ........................................................ 3-6. Initial Procedure ..................................................... 3-7. DC Voltage Test ..................................................... 3-8. AC Voltage Test ......................................................... 3-9. Resistance Test .......................................................
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3-10. Diode Test .............................................................. 3-11. DC mA Test ............................................................ 3-12. DC Amps Test ........................................................ 3-13. Calibration .............................................................. 3-14. Troubleshooting .......................................................... 3-15. Supplemental Troubleshooting Procedures ............ 3-16. Checking the Crystal Oscillator ......................... 3-17. Checking The Reference Voltage ...................... 3-18. Checking Display Drive Voltage ....................... 3-19. Checking Beeper Drive Signal ........................... 3-20. Tracing the VDC Signal Path ............................. 4 List of Replaceable Parts............................................ 4-1. Introduction ................................................................. 4-2. How to Obtain Parts .................................................... 4-3. Newer Instruments ...................................................... 4-4. Service Centers ........................................................... 4-5. Manual Status Information ......................................... 4-6. Parts Lists ....................................................................
3-9 3-10 3-11 3-11 3-11 3-13 3-13 3-13 3-13 3-13 3-13 4-1 4-3 4-3 4-3 4-3 4-4 4-4
5
Schematic Diagrams ................................................... 5-1
ii
List of Tables
Table 1-1. 2-1. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 4-1. 4-2. 5-1.
Title Specifications ..................................................................... S1 Function Codes.............................................................. Recommended Test Equipment.......................................... DC Voltage Test ................................................................. AC Voltage Test ................................................................. Resistance Test ................................................................... DC mA Test........................................................................ DC Amps Test .................................................................... Final Assembly................................................................... A1 Main PCA ..................................................................... Abbreviations .....................................................................
Page 1-5 2-6 3-3 3-8 3-8 3-10 3-11 3-11 4-5 4-7 5-3
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77 Series III
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iv
List of Figures
Figure 2-1. 2-2. 3-1. 3-2. 4-2. 5-1.
Title Overview ............................................................................ AC and A/D Converter ....................................................... Assembly Details................................................................ Troubleshooting Tree ......................................................... A1 Main PCA ..................................................................... A1 Main PCA .....................................................................
Page 2-3 2-7 3-6 3-12 4-9 5-4
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vi
OPERATOR SAFETY INFORMATION
This instrument has been designed and tested in accordance with IEC Publication 348, Safety Requirements for Electronic Measuring Apparatus. This manual contains information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in safe condition. Warning statements identify conditions or practices that could result in personal injury or loss of life. Caution statements identify conditions or practices that could result in damage to the equipment or other property. · · · · · · · · Never use the meter if the meter or test leads look damaged. Always turn off power to the circuit before cutting, unsoldering, or breaking the circuit. Small amounts of current can be dangerous. Never measure resistance in a circuit when power is applied to the circuit. Never touch the probes to a voltage source when the test leads are plugged into the 10A or 300 mA input jack. Never apply more than 1000V dc or ac rms (sine) between any input jack and earth ground. Always be careful when working with voltages above 60V dc or 30V ac rms. Such voltages pose a shock hazard. Always keep your fingers behind the finger guards on the probe when making measurements. Always use a high voltage probe to measure voltage if the peak voltage might exceed 1000V.
SAFETY-1
Symbols Marked on Equipment
DANGER -- High Voltage Attention -- refer to the manual. This symbol indicates that information about the usage of a feature is contained in the manual.
I
Fuse information
Use the Proper Fuse
To avoid fire hazard, use only the fuse identical in type, voltage rating, and current rating as specified on the case bottom fuse rating label.
Do Not Remove Cover
Always operate the meter with case top and bottom properly assembled. Access procedures and the warnings for such procedures are contained in this Service Manual Service procedures are for qualified service personnel only.
Do Not Attempt to Operate if Protection May be Impaired
If the meter appears damaged or operates abnormally, protection may be impaired. Do not attempt to operate it. When is doubt, have the instrument serviced.
SAFETY-2
Chapter 1
Introduction and Specifications
Contents 1-1. 1-2. 1-3. 1-4. Introduction.................................................................. Organization of the Service Manual ............................ Conventions ................................................................. Specifications...............................................................
Page 1-3 1-3 1-4 1-4
1-1
77 Series III
Service Manual
1-2
Introduction and Specifications Introduction
1
1-1. Introduction
This manual presents service information for the Fluke 77 Series III Multimeter. The manual includes a theory of operation, general maintenance procedures, performance tests, calibration procedures, troubleshooting information, a list of replaceable parts, and schematic diagrams. A meter under warranty will be promptly repaired or replaced (at Fluke's option) and returned at no charge. See the registration card for warranty terms. To locate an authorized service center, visit us on the World Wide Web: www.fluke.com or call using any of the phone numbers listed below: USA: 1-888-99-FLUKE (1-888-993-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) Europe: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-5500
1-2. Organization of the Service Manual
The following descriptions briefly describe each chapter in the manual. Chapter 1 Introduction and Specifications This chapter describes use of the Service Manual and application of special terminology (conventions) to describe the meter's circuitry. A complete set of specifications appears at the end of this chapter. Chapter 2 Theory of Operation This chapter first categorizes instrument circuitry into functional blocks, with a description of each block's role in overall operation. A detailed circuit description is then given for each block. These descriptions explore operation to the component level and fully support troubleshooting and repair procedures defined in Section 3. Chapter 3 Maintenance Provides complete maintenance information, from general maintenance and cleaning instructions to detailed troubleshooting and repair procedures to the component level. Troubleshooting and repair procedures rely heavily on both the Theory of Operation presented in Chapter 2 and the Schematic Diagrams shown in Section 5. Chapter 4 List of Replaceable Parts Includes parts lists for all standard assemblies. Information on how and where to order parts is also provided. Chapter 5 Schematic Diagrams Includes schematic for the A1 Main PCA.
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1-3. Conventions
Through the manual, certain notational conventions are used. A summary of these conventions follow: · Instrument Reference The Fluke 77 Series III Multimeter is also referred to throughout this manual as "the meter". · Printed Circuit Assembly The term "pca" is used to represent a printed wiring board and its attached parts. · Circuit Nodes Individual pins or connections on a component are specified by a dash (-) following the component reference designator. For example, pin 19 of U30 would be U30-19. · User Notation Generally, push buttons, function positions, input terminals, and display notation are presented in this manual as they are seen on the meter. Special terms (mnemonics) used in text descriptions of meter circuitry correspond to terms used on the schematic diagrams in Chapter 5.
1-4. Specifications
Specifications for the meters are presented in Table 1-1.
1-4
Introduction and Specifications Specifications
Table 1-1. Specifications Maximum Voltage Between any Terminal and Earth Ground Display Response Time of Digital Display Rated voltage Digital: 3,200 counts, updates 2.5/sec Analog: 31 segments, updates 25/sec V ac < 2 s V dc < 1 s < 1s to 320 k, < 2s to 3.2 M, < 10 s to 32 M 0°C to 50°C -40°C to 60°C 0.1 x (specified accuracy)/°C (<18°C or >28°C) Total accuracy = Specified accuracy + 0.1% of range. 0% to 90% (0°C to 35°C) 0% to 70% (35°C to 50°C) 0% to 80% (0°C to 35°C) 0% to 70% (35°C to 50°C) Operating: 2000 meters Storage: 12,000 meters 9 V NEDA 1604 or 6F22 or 006P, or NEDA 1604A or 6LR61 2000 hrs typical with alkaline 1600 hrs typical with carbon zinc 4096 Hz per MIL-T-PRF 28800F Class III, Sinusoidal, Non Operating 3.7 cm x 8.9 - 7.8 cm x 19 cm (1.5 in x 3.5 - 3.1 in x 7.49 in) 365 g (12.9 oz) 600 V CAT III and 1000 V CAT II per ANSI/ISA S82.01-1994, EN 61010-1: 1993, CSA C22.2 No 1010.1-92, UL 3111-1. EN 61326-1 1997.
1
Operating Temperature Storage Temperature Temperature Coefficient Electromagnetic Compatibility In RF field of 3 V/m on all functions. Relative Humidity except 32 M range 32 M range only Altitude Battery Type Battery Life Continuity Beeper Shock, Vibration Size (H x W x L) Weight Safety
EMC Regulations Certifications/Listings
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Service Manual
Table 1-1. Specifications (cont) Function Range 3.200 V 32.00 V 320.0 V 1000 V 320.0 mV 3.200 V 32.00 V 320.0 V 1000 V 320.0 3200 32.00 k 320.0 k 3.200 M 32.00 M 2.0 V Range Accuracy Accuracy ±(0.3%+1) ±(0.3%+1) ±(0.3%+1) ±(0.4%+1) ±(0.3%+1) ±(2%+2) ±(2%+2) ±(2%+2) ±(2%+2) ±(0.5%+3) ±(0.5%+1) ±(0.5%+1) ±(0.5%+1) ±(0.5%+1) ±(2.0%+1) ±(1% typical) Burden Voltage (typical) 6 mV/mA 50 mV/A 6 mV/mA 50 mV/A
L
mL
K (45 to 500 Hz, 3.2 V range. Other ranges 45 to 1 kHz) e
GR Function ? (45 Hz to 1 kHz)
32.00 mA, ±(2.5%+2) 320.0 mA ±(2.5%+2) 10.00 A * 32.00 mA, ±(1.5%+2) A 320.0 mA ±(1.5%+2) 10.00 A * * 10 A continuous, 20 A for 30 seconds maximum.
1-6
Introduction and Specifications Specifications
Overload protection for all functions and ranges: Rated voltage. Function Input Impedance (Nominal) >10 M, <50 pF Common Mode Rejection Ratio (1 k Unbalanced) Normal Mode Rejection >60 dB at 50 Hz or 60 Hz Full Scale Voltage To 3.2 M 32 M <440 mV dc <420 mV dc (typical) <1.4 V dc <1.3 V dc (typical) 2.0 V dc Short Circuit Current (typical) 300 µA 400 µA VF 0.0 V 0.6 V 1.2 V 2.0 V 0.4 mA 0.3 mA 0.2 mA 0.1 mA Current (typical)
1
L, mL, K L, mL K
>120 dB at dc, 50 Hz, or 60 Hz >60 dB dc to 60 Hz Open Circuit Test Voltage
e
<3.1 V dc <2.8 V dc (typical) Open Circuit Test Voltage
Full Scale Voltage
GR e GR G
<3.1 V dc
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77 Series III
Service Manual
1-8
Chapter 2
Theory of Operation
Contents
Page
2-1. Introduction.................................................................. 2-3 2-2. Functional Block Description ...................................... 2-3 2-3. Detailed Description .................................................... 2-3 2-4. Voltage Signal Conditioning ................................... 2-3 2-5. Current Conditioning............................................... 2-4 2-6. Ohms........................................................................ 2-4 2-7. Additional Circuitry................................................. 2-4 2-8. AC Converter ...................................................... 2-4 2-9. Active Filter ........................................................ 2-5 2-10. Rotary Switch...................................................... 2-5 2-11. A/D Conversion................................................... 2-5
2-1
77 Series III
Service Manual
2-2
Theory of Operation Introduction
2
2-1. Introduction
This chapter contains a brief overview of the 77 Series III Multimeter, followed by a more detailed explanation of operation.
2-2. Functional Block Description
The heart of the instrument consists of a two-chip CMOS system: U1, a primarily analog IC, and U2, a calculator-style microcomputer (see Figure 21).
DCV
0m V 30
OH MS
LCD To Bar Graph To Digital Display
OF F
Input Signal Conditioning
V AC
S1
J1
AC mV
DC
mV
VREF A/D
Range and Function Control
U2 Microcomputer Y1 Counter 32.768 kHz A/D Samples
U1 Analog Chip
aaa01f.eps
Figure 2-1. Overview
2-3. Detailed Description
The following paragraphs describe the 77 Series III Multimeter in more detail. While reading this description, refer to the schematic diagram in Chapter 5.
2-4. Voltage Signal Conditioning Input divider Z1 and dc blocking capacitor C1 make up an input voltage signal conditioning circuit.
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77 Series III
Service Manual
The pins of Z1 are used as follows:
Z1-PIN NUMBER 1 3 4 5 6 FUNCTION input 3.2V range tap 32V range tap 320V range tap 1000V dc/750V ac range tap
Overvoltage protection is provided by R1, RV1, RV2, RV3, and RT1. RT1 is a thermistor that normally has about 1 k of resistance, but increases to very high impedance as it heats up with an overload voltage. R1 provides current limiting for the input until RT1 heats up. In an overload condition, RV1, RV2, and RV3 clamp the voltage at the switch to approximately 2000V.
2-5. Current Conditioning Current input conditioning is provided by R6, R7, R5 and R13. R6 and R7 develop input voltage from the applied current. R5 and R13 act as a voltage divider for the 300-mA range. F1 protects the mA circuitry; F3 protects the 10A circuitry. 2-6. Ohms When the ohms function is selected, the meter compares the unknown resistance at J1 with the reference resistors in Z1.
Input protection for the ohms ranges consists of Q1, Q2, Q3, R1, R2, R3, R4, and RT1. Q1 and Q2 serve as back-to-back zener diodes which limit the input to between 7 and 9V. Also, R2 R3, and R4 limit current, and Q3 clamps pin 29 of U1 to approximately 2.5V.
2-7. Additional Circuitry In addition to the above circuitry, the following circuitry is also used in the Series II meters: AC Converter, Active Filter, Rotary Switch, and A/D Conversion. 2-8. AC Converter The ratio of R17 and R18 determines ac voltage and current accuracy (see Figure 2-2, AC and A/D Converter), and C11 is the averaging capacitor for the half-wave ac converter portion of U1.
2-4
Theory of Operation Detailed Description
2
2-9. Active Filter An active filter that includes R9, R10, C5, and C6 is located in U1. Conditioned input signals are passed through the active filter in route to the a/d converter section of U1. (See Figure 2-2, AC and A/D Converter.)
The clock frequency for the digital portion of the circuit is a function of 32.768-kHz crystal Y1. Y1, C12, C15, and amplifiers in U1 make up the oscillator circuit.
2-10. Rotary Switch Rotary switch S1 FRONT selects and routes the input signals. Function codes for switch S1 REAR are shown in Table 2-1. Range switch S2 signals the microcomputer U2 for the manual ranging and automatic Touch Hold® function.
CR1 acts as protection for U1 if the battery is installed backwards. C2 is part of the power-on reset for microcomputer U2.
2-11. A/D Conversion Analog-to-digital (a/d) conversion is accomplished within U1 using a modified dualslope a/d converter circuit. (See Figure 2-2, AC and A/D Converter.)
Since the a/d conversion process is essentially a dual slope method, two voltages are required to complete a measurement cycle. One is the unknown input and the other is the reference voltage.
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Service Manual
Conditioned input signals are routed to the a/d converter in U1, where they are integrated. The reference voltage developed by reference supply VR1, R15, R16, and R8 is routed to the a/d converter in U1, where it is used for the integrate reference (de-integrate) portions of the measurement cycle. C7 stores offsets of the buffer, integrator, and comparator amplifiers of the a/d converter. The gain of the buffer is determined by the resistors of Z1 between pins 8, 9, and 10. C8 is the integrator capacitor. A series of 10 minor cycle conversions occurs without taking time for an autozero phase between the conversions. These minor cycle conversions, or samples, occur at a rate of 25 per second, and are used to provide the fast response bar-graph display and fast autoranging. New samples are taken every 40 ms. Ten samples are summed to produce a full- resolution digital display, with full scale greater than 3200 counts. A 50ms autozero phase occurs following every 10 sample sequence.
Table 2-1. S1 Function Codes Function ACV DCV 300 mV Ohms ACA DCA B0 1 0 0 0 1 1 0 B1 1 1 0 0 0 1 1 B2 1 1 0 1 0 0 0
2-6
AC CONVERTER ACTIVE FILTER REF DE-INT + FILTER + INT + DIGITAL SECTION REF BUFFER COMPARATOR
INTEGRATOR
AC
INPUT
AC
AC
+ AC FILTER AC
+
U1 28 R9 R19 C5 C6 26 39 R10 40 27 44 45 10 Z1 9 46 C7 Z1 8 C8 47
Figure 2-2. AC and A/D Converter
16
17
C11 +
R17
R18
+
C9
Theory of Operation Detailed Description
aaa03f.eps
2
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2-8
Chapter 3
Maintenance
Contents 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 3-19. 3-20. Introduction..................................................................... PCA Access and General Maintenance .......................... Display Access................................................................ Cleaning .......................................................................... Performance Test ............................................................ Initial Procedure ......................................................... DC Voltage Test ......................................................... AC Voltage Test ............................................................. Resistance Test ........................................................... Diode Test .................................................................. DC mA Test................................................................ DC Amps Test ............................................................ Calibration .................................................................. Troubleshooting .............................................................. Supplemental Troubleshooting Procedures................ Checking the Crystal Oscillator ............................. Checking The Reference Voltage .......................... Checking Display Drive Voltage ........................... Checking Beeper Drive Signal ............................... Tracing the VDC Signal Path.................................
Page 3-3 3-3 3-4 3-4 3-7 3-7 3-7 3-8 3-8 3-9 3-10 3-11 3-11 3-11 3-13 3-13 3-13 3-13 3-13 3-13
3-1
77 Series III
Service Manual
3-2
Maintenance Introduction
3
Warning These service instructions are for use by qualified personnel only. To avoid electric shock, do not perform any servicing other than that contained in the operator's manual unless you are qualified to do so.
3-1. Introduction
This chapter contains maintenance information for the performance testing, calibration, general maintenance, and troubleshooting of the 77 Series III Multimeter. For operator maintenance, refer to the Instruction Sheet. The performance tests are recommended as a preventive maintenance tool to verify proper instrument operation. A one year calibration cycle is recommended to maintain the specifications given in the Users Manual. Test equipment required for the performance tests and calibration is listed in Table 3-1. If the recommended equipment is not available, instruments with equivalent specifications may be used.
Table 3-1. Recommended Test Equipment Instrument Type Multi-Product Calibrator Recommended Model Fluke 5500A
3-2. PCA Access and General Maintenance
Warning To avoid electrical shock, remove the test leads before opening the case, and close the case before operating the meter. To prevent fire, install fuses with the rating shown on the back of the meter. Caution To avoid contaminating the pca with oil from the fingers, handle it by the edges or wear gloves. PCA contamination may not cause immediate instrument failure in controlled environments. Failures typically show up when contaminated units are operated in humid areas. Use the following procedure for removing the pca (printed circuit assembly) from its case:
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77 Series III
Service Manual
1. Set the function switch to OFF, and disconnect test leads if they are installed. 2. Remove the four Phillips screws from the bottom cover. 3. Turn the meter face up, grasp the top cover, and pull the top cover from the meter. 4. Remove the 11A fuse to access the screw that holds the pca to the case bottom. 5. The pca may now be removed from the bottom cover.
3-3. Display Access
Caution Do not handle the conductive edges of the LCD interconnects. If contaminated, clean with alcohol. Refer to Figure 3-1. 1. Remove the four Phillips screws from the back side of the pca. 2. Remove the LCD mounting bracket. 3. Insert a small screwdriver under the edges of the display holding bracket, and gently pry the bracket loose from the snaps. 4. Turn the bracket upside down to remove the LCD. 5. Before installing a new LCD, make sure that all connector contact points are clean.
3-4. Cleaning
Caution To avoid damaging the meter, do not use aromatic hydrocarbons or chlorinated solvents for cleaning. These solutions will react with the plastics used in instruments. Do not allow the LCD to get wet. Remove the display assembly before washing the pca and do not install until the pca is completely dry. Do not use detergent of any kind for cleaning the pca. Do not remove lubricants from the switch when cleaning the pca.
3-4
Maintenance Cleaning
3
Clean the instrument case with a mild detergent and water. The pca may be washed with isopropyl alcohol or deionized water and a soft brush. Remove the display assembly and fuses before washing, and avoid washing the switch if possible. Dry the pca with clean dry air at low pressure, then bake it at 50°C for 24 hours.
3-5
77 Series III
Service Manual
Decal Window Knob Assembly
Case Top
LCD Window Shock Absorber Detent Spring Key Pad Internal Cover Shaft Adapter AC Shield Screw, 4-24 F1 Main PCA Mask LCD Elastomeric Connector Bracket
F2 Screw, 4-14 Bottom Shield Case Bottom Assembly Battery Annunciator Contact Screw, 5-14
Probe Holder Tilt Stand
FLUKE-77-3
aaa12c.eps
Figure 3-1. Assembly Details
3-6
Maintenance Performance Test
3
3-5. Performance Test
Performance tests are recommended for incoming inspection, periodic maintenance, and for verifying the specifications in the Instruction Sheet. If the instrument fails any part of the test, calibration and/or repair is indicated. In the performance tests, the Fluke 77 Series III is referred to as the unit under test (UUT).
3-6. Initial Procedure 1. Allow the UUT to stabilize to room temperature 23°C ± 5°C (73°F ± 9°F).
2. Check the fuses and battery, and replace them if necessary. Warning To prevent fire, install fuses in accordance with the rating shown on the back of the meter. Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator (N) appears.
3-7.
DC Voltage Test
Warning Connect the ground/common/low side of the DC calibrator to COM on the UUT.
1. Set the UUT function switch to VDC, and connect the DC Voltage Calibrator output to the z and COM input terminals of the UUT. 2. Referring to Table 3-2, set the DC Voltage Calibrator for the output indicated in steps 1 through 4 only. Verify that the UUT display reading is within the limits shown. 3. Set the DC Voltage Calibrator for an output of +300 mV, and switch the UUT to the 300 mV function. Verify that the UUT display reading is within the limits shown in Table 3-2 (step 5).
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Table 3-2. DC Voltage Test Step 1 2 3 4 5* DC Input Voltage +2.7V +27V +270V +1000V +300 mV Display Reading 2.691 to 2.709V DC 26.91 to 27.09V DC 269.1 to 270.9V DC 995 to 1005V DC 299.0 to 301.0V DC
*300 mV function only
3-8. AC Voltage Test
Warning Connect the ground/common/low side of the AC calibrator to COM on the UUT. 1. Set the UUT function switch to VAC, and connect the AC Voltage Calibrator to the z and COM input terminals. 2. Set the AC Voltage Calibrator for the output given in Table 3-3, verify that the UUT display reading is within the limits shown. Note When the input is open in the VAC function, it is normal for the meter to read some counts on the display. This is due to ac pickup in the ac amplifier when the ac amplifier when the ac amplifier is unterminated.
Table 3-3. AC Voltage Test Input Step 1 2 3 4 Voltage 2.7V 2.7V 1000V 1000V Frequency 100 Hz 500 Hz 100 Hz 1000 Hz Display Reading 2.644 to 2.756V AC 2.644 to 2.756V AC 978 to 1022V AC 978 to 1022V AC
3-9. Resistance Test 1. Select the ohms function on the UUT.
2. Connect the Ohms Calibrator or Decade Resistor to the z and COM input terminals of the UUT.
3-8
Maintenance AC Voltage Test
3
Referring to Table 3-4, set the Ohms Calibrator or Decade Resistor to the resistance value indicated in steps 1 through 6. Verify that the display reading is within the limits shown.
3-10. Diode Test 1. Set the UUT to the Diode Test function.
Note On Fluke 5100 series calibrators, activate the 50 divider override. On Fluke 5500A calibrators, lock voltage to the 33V range. 2. Apply an input from the DC Voltage Calibrator of +.090V dc to the z and COM input terminals of the UUT, and verify that the beeper is on. 3. Increase the DC Voltage Calibrator output to +.110V dc, and verify that the beeper is off.
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Table 3-4. Resistance Test Step 1 Decades of 1: 2 3 4 5 6 7 Decades of 1.9: 2 3 4 5 6 7 Decades of 2.7: 2 3 4 5 6 7 270 2.7 k 27 k 270 k 2.7 M 27 M 268.3 to 271.7 (plus 0 reading) 2685 to 2715 26.85 to 27.15 k 268.5 to 271.5 k 2.685 to 2.715 M 26.45 to 27.55 M 190 1.9 k 19 k 190 k 1.9 M 19 M 188.7 to 191.3 (plus 0 reading) 1889 to 1911 18.89 to 19.11 k 188.9 to 191.1 k 1.889 to 1.9111 M 18.61 to 19.39 M 100 1k 10 k 100 k 1 M 10 M 99.2 to 100.8 (plus 0 reading) 994 to 1006 9.94 to 10.06 k 99.4 to 100.6 k .994 to 1.006 M 9.79 to 10.21 M Input Resistance short Display Reading 0.0 to 0.3
3-11. DC mA Test 1. Set the output of the DC Current Calibrator to zero, and connect it to the 300mA and COM input terminals of the UUT.
2. Set the DC Current Calibrator to the output shown in Table 3-5, and verify that the UUT display reading is within the limits shown.
3-10
Maintenance Troubleshooting
Table 3-5. DC mA Test Step 1 2 Input Current +27 mA +200 mA Display Reading 26.57 to 27.43 DC 196.8 TO 203.2 DC
3
3-12. DC Amps Test 1. Set the DC Current Calibrator to standby and connect it to the 10A and COM input terminals of the UUT.
2. Apply currents as indicated in Table 3-6, and verify that the display reading is within the limits shown.
Table 3-6. DC Amps Test Step 1 Input Current +10A Display Reading 9.83 to 10.17 DC
3-13. Calibration 1. Set the DC Voltage Calibrator to zero, and set the UUT to the VDC function.
2. Remove the case top cover as previously described. 3. Connect the DC Voltage Calibrator to the zand COM input terminals of the UUT. 4. Set the DC Voltage Calibrator for an output of +3.000V dc, and adjust R8 for a display reading of +3.000V dc ± .001V.
3-14. Troubleshooting
A troubleshooting tree for the meter is given in Figure 3-2. Faults are listed in the order of probability. This tree gives a systematic approach to isolation of problems to a component or component area. Complete the procedures in the order listed in this table; all measurements are made with respect to common. Also, supplemental troubleshooting procedures are presented in the following paragraphs. When troubleshooting the meter, use the precautions listed on the static awareness sheet to prevent damage from static discharge.
3-11
77 Series III
Service Manual
1.
Turn meter on Does meter power up?
ON YES
Check: a. Power supplies TP1 = 3.1V dc +/-0.1V TP3 = 1.5V dc U1 pin 48 = 6V dc (Battery voltage - TPIV) (If any of these voltages are high, low, or missing, replacement of U1 is usually necessary) b. For loose pins on U1, U2 c. Battery voltage d. S1 for bad contacts e. VR1 for 1.2V dc f. Shield for short to Q3 g. For solder debris/shortd Check: a. b. c. d. e. For loose pins on U1, U2 For shorted C5, 6, 7, or 8 Contacts of S1 For shorted pins on U1, U2 Y1 Frequency @ 32.768 kHz
2.
Meter powers up, but does not come out of self-test.
YES NO
3.
Meter comes up with missing segments.
YES NO
Check: a. LCD for cracks b. For contaminated display interconnects or display contact areas c. For loose pins on U2 d. For cracks in U2 package e. Junction of R11 and R12 for 1.6V dc. Probable cause: a. b. c. d. e. RV1 or RV2 or RV3 shorted S1 Contacts bad Z1 open or out of tolerance U1 bad U1 loose/shorted pins
4.
Switch meter to V and apply 3V dc. Does meter display 3 VDC?
ON YES
5.
Does meter autorange correctly?
ON YES
Probable cause: a. U1 bad b. S1 bad
6.
Switch meter to V. Apply 3V @ 500 Hz. Does meter display 3 VAC?
YES NO
Probable cause: a. U1 bad (also check for loose or shorted pins) b. S1 bad c. C9, C11 shorted Probable cause: a. b. c. d. S1 bad Q1, Q2 shorted Loose pins on U1, U2 U1 bad
7.
Switch meter to . Apply 100 ohms. Does meter display 100 ?
NO YES
8.
Switch meter to A. Apply 300 mA dc. Does meter display 300 DC?
NO YES
Probable cause: a. b. c. d. F1, F2 open S1 bad R7 open Open land patterns in current path
9.
Switch meter to Does beeper sound when leads are shorted?
. NO
Check: a. Connector contact points b. For correct signal at contact points. Should be 4.1 kHz waveform. (If above checks are good, LS1 replacement is necessary.)
aaa02f.eps
Figure 3-2. Troubleshooting Tree
3-12
Maintenance Troubleshooting
3
3-15. Supplemental Troubleshooting Procedures 3-16. Checking the Crystal Oscillator Connect an oscilloscope or counter to pin 54 U1 or to the junction of C12 and the Y1 crystal. Check for a 32.768-kHz sine wave approximately 600 mV p-p in amplitude. Note that U2 and the display will not work if the clock circuit is not working.
Probable related failures include: U1, Y1, or C12.
3-17. Checking The Reference Voltage Check for a reference voltage of 1.00V dc (adjustable by R8) at pin 14 of U1 or at the junction of R15 and R16.
Probable related failures include: R8, R14, R15, R16, VR1, or CR2.
3-18. Checking Display Drive Voltage Check that VM (V middle) is 1.6V dc ±.1V at pin 28 U2 or at the junction of R11 and R12.
Probable related failures include: R11 or R12.
3-19. Checking Beeper Drive Signal Put the unit in the Diode Test Mode and short the input leads. Using an oscilloscope, measure the signal at pin 3 of U1. The signal should be a 4V p-p symmetrical square wave at about 4.1 kHz.
A probable related failure is: U1
3-20. Tracing the VDC Signal Path Use the following procedure to trace the VDC signal path:
1. Set the UUT to the VDC function and apply 2V dc to the input. 2. Using a DVM, measure the input at J1 for 2V dc. 3. Measure pin 1 of Z1 input divider for 2V dc. Probable related failures include: R1, S1, RV1, or RV2. Note Measurements in steps 4,5, and 6 may be affected by loading. 4. Measure Z1 pin 3 for 200 mV dc. Probable related failures are: Z1, U1. 5. Measure for 200 mV dc at the active filter input (AFI, pin 26 of U1 or R9). A probable failures is: U1 6. Measure for 200 mV at the active filter output (AFO, pin 27 of U1 or R9). Probable related failures are: R9, C5, or C6.
3-13
77 Series III
Service Manual
3-14
static awareness
A Message From
Fluke Corporation
Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices by: 1. Knowing that there is a problem. 2. Leaning the guidelines for handling them. 3. Using the procedures, packaging, and bench techniques that are recommended. The following practices should be followed to minimize damage to S.S. (static sensitive) devices.
1. MINIMIZE HANDLING
3. DISCHARGE PERSONAL STATIC BEFORE HANDLING DEVICES. USE A HIGH RESISTANCE GROUNDING WRIST STRAP.
2. KEEP PARTS IN ORIGINAL CONTAINERS UNTIL READY FOR USE.
4. HANDLE S.S. DEVICES BY THE BODY.
Static Awareness -1
5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT.
8. WHEN REMOVING PLUG-IN ASSEMBLIES HANDLE ONLY BY NON-CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION. PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S.S. DEVICES.
6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE.
9. HANDLE S.S. DEVICES ONLY AT A STATIC-FREE WORK STATION. 10. ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED. 11. ONLY GROUNDED-TIP SOLDERING IRONS SHOULD BE USED.
7. AVOID PLASTIC,VINYL AND STYROFOAM® IN WORK AREA.
PORTIONS REPRINTED WITH PERMISSION FROM TEKTRONIX INC. AND GERNER DYNAMICS, POMONA DIV.
® Dow Chemical
Static Awareness-2
Chapter 4
List of Replaceable Parts
Contents 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. Introduction..................................................................... How to Obtain Parts........................................................ Newer Instruments .......................................................... Service Centers ............................................................... Manual Status Information ............................................. Parts Lists........................................................................
Page 4-3 4-3 4-3 4-3 4-4 4-4
4-1
77 Series III
Service Manual
4-2
List of Replaceable Parts Introduction
4
4-1. Introduction
This section contains an illustrated list of replaceable parts for 77 Series III Multimeter.
4-2. How to Obtain Parts
Electrical components may be ordered directly from the Fluke Corporation and its authorized representatives by using the part number under the heading FLUKE PN. In the U.S., order directly from the Fluke Parts Dept. by calling 1-800-526-4731. Parts price information is available from the Fluke Corporation or its representatives. Prices are also available in a Fluke Replacement Parts Catalog which is available on request. In the event that the part ordered has been replaced by a new or improved part, the replacement will be accompanied by an explanatory note and installation instructions, if necessary. To ensure prompt delivery of the correct part, include the following information when you place an order: · · · · · · Part number and revision level of the pca containing the part. Reference designator Fluke stock number Description (as given under the DESCRIPTION heading) Quantity Instrument Model, Serial Number, and Firmware Numbers
4-3. Newer Instruments
Changes and improvements made to the instrument are identified by incrementing the revision letter marked on the affected pca. These changes are documented on a manual supplement which, when applicable, is included with the manual.
4-4. Service Centers
To locate an authorized service center, call Fluke using any of the phone numbers listed below, or visit us on the World Wide Web: www.fluke.com USA: 1-888-99-FLUKE (1-888-993-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) Europe: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-5500
4-3
77 Series III
Service Manual
4-5. Manual Status Information
The following Manual Status Information table defines the assembly revision levels that are documented in the manual. Revision levels are printed on the component side of each pca.
Manual Status Information Assembly A1 Main PCA Revision Level c
4-6. Parts Lists
The following tables list the replaceable parts for the 77 Series III Multimeter. Parts are listed by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator. The parts lists give the following information: · · · · · · Reference designator An indication if the part is subject to damage by static discharge Description Fluke stock number Total quantity Any special notes (i.e., factory-selected part) Caution A * symbol indicates a device that may be damaged by static discharge. Note This instrument may contain a Nickel-Cadmium battery. Do not mix with the solid waste stream. Spent batteries should be disposed of by a qualified recycler or hazardous materials handler. Contact your authorized Fluke service center for recycling information. Warning This instrument contains a fusible resistor (pn 740662). To ensure safety, use exact replacement only.
4-4
List of Replaceable Parts Parts Lists
Table 4-1. Final Assembly Ref Des A1 BT1 DS1 F1W F2W H1 H2 H7 LS1 MP4 MP5 MP6 MP9 MP10 MP11 MP12 MP14 MP16 MP17 MP18 MP19 MP20 MP21 MP23 MP32 MP40 S2 TM1 TM2 Description MAIN PCA BATTERY,9V,0-15MA LCD,3.75 DIGIT,BAR GRAPH,MULTIPLED FUSE,.406x1.375,0.440A,1000V,FAST FUSE,.406X1.5, 11A, 1000V, FAST SCREW,PH,P,THD FORM,STL,4-24,.250 SCREW,PH,P,AM THD FORM,STL,4-14,375 SCREW,PH,P,AM THD FORM,STL,5-14,.759 AF TRANSD,PIEZO,20MM,600MW,6KHZ HOLDER,PROBE STAND,TILT LABEL,WINDOW SHIELD,AC SPRING,DETENT KNOB,SWITCH ADAPTER,SHAFT CASE BOTTOM ASSEMBLY SHOCK ABSORBER CASE TOP PAD XFR WINDOW, LCD COVER,INTERNAL MASK,BRACKET,77-3 WITH LOGO CONN,ELASTOMERIC,LCD TO PWB,1.900 L SHIELD,BOTTOM TEST LEADS CONTACT,ANNUNCIATOR KEYPAD 77/75/23/21 SERIES III INSTRUCTION SHEET 77 SERIES III SERVICE MANUAL Fluke PN Qty NA 696534 602927 943121 803293 519116 448456 832246 642991 648748 648961 844337 648755 822643 648706 649175 659786 428441 648763 648714 648722 648771 650264 648839 TL75 642983 648847 686571 800604 1 1 1 1 1 1 5 4 1 1 1 1 1 4 1 1 1 1 1 1 1 2 1 1 1 1 1 1 Notes
4
W To ensure safety, use exact replacement only.
4-5
77 Series III
Service Manual
MP6 MP11
MP17
MP18 MP16 MP10 S2 MP19 MP12 MP9 H1 F1 A1 MP20 DS1 MP21
F2 H2 MP23 MP14 BT1 MP40 LS1 H7
MP4 MP5
FLUKE-77-3
aaa05c.eps
Figure 4-1. Final Assembly
4-6
List of Replaceable Parts Parts Lists
Table 4-2. A1 Main PCA Ref Des C1 C2,C3 C4 C5,C6 C7 C8 C9 C10 C11 C12 C13 C14,C15 C16 CR1,CR2 J1-4 Q1,Q3 Q2 R1 R2 R3 R4 R5 R6 R7 R8 R9,R19 R10 R11,12 R13 R14 R15 R16 R17 R18 RT1 RV1-,RV3 S1 U1 U2 VR1 XBT1 XF1 Description CAP,POLYES,0.0UF, ±10%,1000V CAP,CER,0.1UF, ±10%,25v,X7R CAP,TA,2.2UF, ±20%,20V CAP,POLYCA,0.027UF, ±10%,63V CAP,TA,0.47UF, ±20%,25V CAP,POLYPR,0.033UF, ±10%,63V CAP,TA,10UF, ±20%,10V,3528 CAP,CER,0.1UF, ±10%,25V,XR7 CAP,TA,2.2UF, ±20%,6V,3216 CAP,CER,47PF, ±5%,50V,C0G CAP,CER,0.22UF,+80%,-20%,50V,Y5V CAP,CER,33PF, ±5%,50V,C0G CAP,CER,47PF, ±5%,50V,COG DIODE,SI,75V,250MA,SOT-23 RECEPTACLE,INPUT XSTR,SI,NPN,25V,.3W,SEL,SOT-23 XSTR,SI,NPN,60V,350MW,SOT-23 RES,WW,3.5K, ±5%,5W,20PPM RES,CERM,1K, ±5%,1W,200PPM RES,CERM,1M, ±5%,1W RES,CF,100K, ±1%,0.25W,100PPM RES,MF,402K, ±0.25%,0.25W,50PPM RES,WW,4.99, ±1%,5W RES,WW,.005, ±1%,.5W RES,VAR,CERM,100K, ±25% RES,CERM,1M, ±1%,0.125W,100PPM RES,CERM,1.5M, ±1%,.1W,400PPM, RES,MF,10K, ±1%,0.1W,100PPM RES,MF,44.8K, ±0.25%,0.1W,50PPM RES,CF,61.9K, ±1%,0.125W,100PPM RES,MF,56.2K, ±1%,0.1W,100PPM RES,MF,205K, ±1%,0.1W,100PPM RES,CERM,20.5K, ±0.5%,100PPM RES,CERM,9.2K, ±0.5%,100PPM THERMISTOR,POS,1.1K, ±+-20%,25 C VARISTOR,910, ±+-10%,1.0MA SWITCH,ROTARY IC CHIP IC, CMOS SM5A IC, 1.23V,150 PPM T.C.,BANDGAP BATTERY CONNECTOR CONTACT, FUSE PN 822361 942529 854760 720979 876180 721050 603032 942529 930248 494633 740597 603172 494633 830489 658580 821637 742676 107695 601176 655175 769802 602664 642923 740415 912493 836387 602703 928791 602679 821330 602687 602935 107711 107745 602995 876193 642918 791269 603669 634451 825976 659524 Qty. 1 2 1 2 1 1 1 1 1 1 1 1 1 2 4 2 1 1 1 1 1 1 1 1 1 2 1 2 1 1 1 1 1 1 1 3 1 1 1 1 1 2 Notes
4
* * *
* * *
4-7
77 Series III
Service Manual
Table 4-2. A1 Main PCA (cont) Ref Des XF2 Y1 Z1 Z2 Description CONTACT, FUSE CRYSTAL,32.768KHZ, ±+-1%,3 X 8MM * RNET,CERM,SIP,FLUKE 77 HI V DIV. * RNET,CERM,SIP, HI V PROTECT PN 707190 643031 946202 103454 Qty. 2 1 1 1 Notes
4-8
List of Replaceable Parts Parts Lists
4
FLUKE 77-3-4001
aaa06f.eps
Figure 4-2. A1 Main PCA
4-9
77 Series III
Service Manual
FLUKE 77-3-4001
aaa07f.eps
Figure 4-2. A1 Main PCA (cont.)
4-10
Chapter 5
Schematic Diagrams
5-1
77 Series III
Service Manual
5-2
Schematic Diagrams
5
Table 5-1. Abbreviations Abbreviation ACA ACHI ACL ACLO AFI AFO AM0 AM1 AZ BPR BT CLK COM DCS EC FA0 FA(-) INT K0 K1 LS LO OHS RNG RRS RT VSS BDD VM WW XTL Z Definition AC Converter Feedback AC Converter High All Clear, Reset AC Converter Low Active Filter Input Active Filter Output Amp[s Input Amps Divide by 10 Auto Zero Point Beeper Driver Battery Clock Output Common DC Sense Reference Voltage Active Filter Amp Output Active Filter Amp Feedback Integrator Oputput Buffer x 1 Output Buffer Divide by 3 Output Loud Speaker Low Ohms Sense Range Reference Resistor Sense Thermistor Negative Supply Voltage Positive Supply Voltage Volts Middle Wirewound Crystal Oscillator Inputs Impedance
5-3
77 Series III
Service Manual
FLUKE 77-3-4001
aaa06f.eps
Figure 5-1. A1 Main PCA
5-4
Schematic Diagrams
5
FLUKE 77-3-4001
aaa07f.eps
Figure. A1 Main PCA (cont)
5-5
77 Series III
Service Manual
Z2
1.0M
2MM
OHMS,DT,CONT S1 11 10 C14 33PF 5%
9 19 20 10 21 11
GUARD GUARD OHS GUARD GUARD
RV3 910V J1 RT1 1.1K 2 0 % 6MM 1000V R1 3.5K 5 % 2 M M 5W WW RV2 910V 1MM OHMS,DT CONT,MVDC S1 2 3
7
VOLTS/ OHMS
1.5MM R2 C1 1.0K 0.01 5%
2MM
1
Z1
10M
2 3
4MM
1000V M Z1 S1 2 1 OHMS,VDC,MVDC
1.1M 4 101K 5 10K 6 1.0K
30 31 32 33 34 35 36 37
GUARD V0 GUARD V1 GUARD V2 V3 V4
RV1 910V J2 F1 6 M M 44/100A FAST 1000V J3 F2 11A FAST 1000V 4
R4 100K 1% R3 1.0M 5 % 1W
0.25%
18 12 29 42 24
RRS DCS MV AM0
300MA
MA
R5 402K 0.25% 0.25W R6 4.99 5W WW 3 R7 .005 1% 0.5W WW 1 MF Q1 SEL 7
22
0.1W
AMI
S1 VAC,VDC 8
R13 44.8K
10A
6MM
15
MF
COM
J4
COMMON
COM
2
Q2 MMBT3904
25
LO
VDD
REFERENCE DESIGNATON LAST NOT USED USED BT1 C15 CR2 DS1 F2 J4 LS1 Q3 R19 RT1 RV3 S3 TP3 U2 VR1 Y1 Z2
R14 61.9K
CR2 BAS16
R15 56.2K 0.1W R2 VR1 1.23V R16 205K 0.1W TP2 2.7V CAL
CW
R8 100K 25%
FLUKE 77-3-1001
aaa09f.eps
Figure 5-1. A1 Main PCA (cont)
5-6
13 41 43
GUARD GUARD GUARD
Q3 SEL
Schematic Diagrams
5
S1
9 6
TP1 Y1 32.768KHZ C12 47PF 5% C15 33PF 5% BT1 9V CR1 BAS16 LS1 S1
VDD
6 S1 4 7 B1 B0
6 S1 5 6 B2
6 12 5 B3 4 C16 47PF 5% ON
C13 0.22 20%
54 XTAL2 XTAL1
55 TEST
2 BPR
3 -VSS
48 +VDD
8
U1 AP75 ANALOG PROCESSOR MOHMS 3V,300K 30V,30K 300V,3K 1000V,300 V DT,OHMS C0 C1 OHMS DE-INT MA,10A DE-INT C2 C3 OHMS D3 OHMS VOLTAGE SOURCE D2 D1 D0 CLK NDAV FUNCTION CODE 49 50 51 52 56 57 58 59 60 1
EC TO DIGITAL SECTION AC CONVERTER AC* AC* AC ACTIVE FILTER LOW HIGH AC X0.3 AC K1 X1 FA(-) ACLO ACHI ACA FAO AFO AFI K0 FILTER* INT INT BUFFER INTEGRATOR COMPARATOR
14 RANGE
20.5K 0.5% R19 1.00M
1.00M
16 C11 2.2 6V
17
28
26
39 R10 1.50M 0.1W C5 .027 PC 63V
40
27
44
45
R17
46 C7 0.47 25V
INT 47 C8 .033 PP 63V
R9
C6 PC 63V .027
Z1
225K
9 110K 8
10
R18 9.20K 0.5% C9 10 10V
AZ
FLUKE 77-3-1001
aaa10f.eps
Figure 5-1. A1 Main PCA (cont)
5-7
77 Series III
Service Manual
C4 2.2 20V
C10 0.1 25V
22 26
C2 0.1 25V
25 19 3 4 18 5 6 7 8 9 10 11 12 13 14 15 16 17
CK2 RESET DDC INTA F T P00 P01 P02 P03 P10 P11 P12 P13 P20 P21 P22 P23
OSCIN OSCOUT
VCC VM VDD VDD
C3 0.1 25V
T1 T2
80 79 2 20
U2 SMN3
23 24
H0 H1
78 77
30 31 33 34 35 36 37 38 57 58 59 60 49 50 51 52 53 54 55 56 63 27 28 29 39 42 43 44 45 46 47 48 64 65 66 67 68 69 70 71 73 74
VDD
TP3
R12 10.0K 0.1W 1 S2 2
R11 10.0K 0.1W 2 HOLD S3 1
13 14 15 16 17 18 22 24 25 26 27 28 29 30 32 33 34 35 36 37 38 40 2 19 20 21 23 31 39
3 4 5 6 7 8 9 10 11
BG1 BG3 BG5 BG7 BG9 BG11 BG13 BG15 BG17 BG19 BG21 BG23 BG25 BG27 BG29 BG31 AUTO 4A 4C MAN 3D 3E 3A 3B 2D 2E 2A 2B 1D 1E 1A AC +/K M DC HV HOLD BT
DS1
LCD-PANTHER
S1 POSITIONS PROCEDING CLOCKWISE FUNCTION CODE* B0 B1 B2 - - 1 1 1 0 1 1 0 0 0 0 0 1 1 0 0 1 1 0 0 1 0 *1=VDD 0=COMMON
FUNCTION 1 2 3 4 5 6 7 8 OFF AC VOLTS DC VOLTS 300 MVDC OHMS DIODE TEST/CONTINUITY AC CURRENT DC CURRENT
M CER TA PP PC WW MG MF CERM
DESIGNATES MYLAR/POLYESTER FILM CAPACITOR DESIGNATES CERAMIC CAPACITOR DESIGNATES TANTALUM CAPACITOR DESIGNATES POLYPROPYLENE CAPACITOR DESIGNATES POLYCARBONATE CAPACITOR DESIGNATES WIRE WOUND RESISTOR DESIGNATES METAL GLAZE RESISTOR DESIGNATES METAL FILM RESISTOR DESIGNATES CERMET FILM RESISTOR
FLUKE 77-3-1001
42
H1
H0
41
12
32 72
GND GND
S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 S40 S41
aaa11f.eps
Figure 5-1. A1 Main PCA (cont)
5-8