Digital Section Detailed Circuit Description | Fluke 5720A manual

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Fluke 5720A service manual Digital Section Detailed Circuit Description, Front/Rear Binding Posts, Rear Panel Assembly A21

Contents

Multi-Function Calibrator Service Manual5700A/5720A Series LIMITED WARRANTY & LIMITATION OF LIABILITY 5/94 Bescheinigung des Herstellers/Importeurs Interference InformationDeclaration of the Manufacturer or Importer Page OPERATOR SAFETY SUMMARY HIGH VOLTAGELETHAL VOLTAGE Terms in this Manual Symbols Marked on Equipment Power SourceUse the Proper Power Cord Use the Proper Fuse SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLYDo Not Service Alone Use Care When Servicing With Power On FIRST AID FOR ELECTRIC SHOCK Free the Victim From the Live ConductorGet Help Never Accept Ordinary and General Tests for Death Table of Contents Introduction and SpecificationsTitle Page 5700A/5720A Series Theory of Operation ±PA Supplies Digital Control How the DAC is Used in Calibration Calibration Procedure Calibration and VerificationOhms Cal Assembly A9 Maintenance TroubleshootingRear Panel Assembly Access Using Remote Commands Reserved for Servicing Schematic Diagrams List of Replaceable Parts viii List of Tables Unregulated Supplies from the Filter Assembly A16A1 Power Amplifier Digital Control SIP PCA Test Record for Flatness Check of the AC 2 mV RangeA11A2 DAC Buffered Reference SIP PCA A13A1 Oscillator Wideband SMD PCA Service Manual List of Figures Ohms Main Assembly Simplified Schematic Power Amplifier with Calibrator Set to 22V at 1 kHz A15 High Voltage/High Current PCA Service Manual Introduction and Specifications Chapter Service Manual 5700A/5720A Series II Calibrator 1-1. Introduction 1-3. About this Manual 1-4. How to Use this Manual1-2. Contacting Fluke 1-5. Additional Instruction Manuals 1-6. Wideband AC Voltage Module Option 5700A-03∙ 5700A/5720A Series II Getting Started Manual PN ∙ 5700A/5720A Series II Operator Reference Guide PN 1-8. 5725A Amplifier 1-9. Support Equipment and Services1-7. Auxiliary Amplifiers 1-11. 732B-200 Direct Volt Maintenance Program U.S.A. Only 1-10. 732B Direct Voltage Reference Standard1-12. 742A Series Resistance Standards 1-13. Wideband AC Module Option 5700A-03 Calibration Support 1-14. Service Centers 1-15. The Components of the 5700A/5720A Series II Calibrator 1-16. Calibrating the 5700A/5720A Series II Calibrator Calibrating the 5700A/5720A Series II Calibrator 1-17. The Calibration Process 1-18. Establishing Traceability 1-19. Calibration Reports 1-20. Calibration Check1-21. Developing a Performance History 1-24. Specifications 1-25. Specification Confidence Levels1-26. Using Absolute and Relative Uncertainty Specifications 1-22. Range Calibration 1-27. Using Secondary Performance Specifications Specifications 1-28. DC Voltage Specifications 5720A99 % Confidence Level 95% Confidence Level DC Voltage Specifications 5700A99 % Confidence Level 95 % Confidence Level Overshoot 5 % Common mode rejection 140 dB, DC to 400 Hz 1-29. AC Voltage Specifications AC Voltage Specifications See Volt-Hertz capability in Figure 90 Days 99 % Conf idence Level± 5 C from calibration temperature 95% Confidence Level ±ppm output + mV ± ppm output + μV0-10 C and dBm reference 600 Ω 5725A AmplifierFigure 1-2. Volt-Hertz Capability 99% Confidence Level 1-30. Resistance SpecificationsResistance Specifications Service Manual ±1 C Note Characterizedcompensation active Table 1-13. Current Derating Factors I IL 1-31. DC Current Specifications DC Current Specifications5720A 99% 5720A 95% Service Manual Overshoot 5 % 1-32. AC Current Specifications AC Current Specifications Service Manual 95 % Confidence Level Temperature Coefficient Note ± ppm output + nAV rms maximum load for full accuracy 1-33. Wideband AC Voltage Option 5700-03 Specifications Wideband AC Voltage Option 5700-03 SpecificationsTable 1-22. Wideband AC Voltage Option 5700-03 Specifications 1-35 Size 1-34. General SpecificationsGuard isolation 20 1-35. Auxiliary Amplifier Specifications Auxiliary Amplifier Specifications5220A AC Current, 180-day specifications 5205A 220V - 1100 V ac, 0 V - 1100 V dc Overshoot 10 % Service Manual Theory of Operation 2-36 Theory of Operation 2-155 2-1. Introduction 2-2. Calibrator Overview2-3. Internal References 2-4. Hybrid Reference Amplifiers 2-6. Digital-to-Analog Converter DAC 2-7. Digital Section Overview2-8. Analog Section Overview ahp003f.eps Figure 2-1. Digital Section Block DiagramAnalog Section Overview 2-9. Functional Description Presented by Output Function 2-10. DC Voltage Functional Description Figure 2-2. Analog Section Block Diagram, Part ahp33f.eps Figure 2-3. Analog Section Block Diagram, Part 5700/5720A Series II Calibrator 2-11. AC Voltage Functional Description 2-14. AC Current Functional Description 2-12. Wideband AC V Functional Description Option2-13. DC Current Functional Description 2-15. Ohms Functional Description 2-17. Digital Motherboard Assembly A42-16. System Interconnect Detailed Circuit Description 2-18. Transformer Assembly A22 2-19. Analog Motherboard Assembly A3 ahp35f.eps Functional Description Presented by 0utput FunctionFigure 2-4. System Interconnections Figure 2-4. System Interconnections cont Connected to Assembly Table 2-1. Analog Motherboard ConnectorsMotherboard Connector 2-21. Rear Panel Assembly A21 2-22. Filter PA Supply Assembly A182-24. Digital Power Supply Assembly A19 2-23. Digital Section Detailed Circuit Description 2-25. +5V Power Supply 2-26. ±12V Power Supplies2-27. +35V Power Supply Digital Section Detailed Circuit Description 2-28. +75V Power Supply 2-29. +35V and +75V Shut-Down Circuit 2-32. Clock Generation 2-30. CPU Central Processing Unit Assembly A202-31. Power-Up and Reset Circuit Figure 2-5. CPU Assembly Block Diagram ahp004f.eps Table 2-3. CPU Acronym Glossary Function 2-33. Watchdog Timer 2-34. Address Decoding and DTACK Data AcknowledgeTable 2-4. CPU Memory Map Chip Select 2-37. RAM Random-Access Memory 2-35. Interrupt Controller2-36. Glue Logic 2-38. ROM Read-Only Memory 2-41. Clock/Calendar Circuit 2-39. Electrically-Erasable Programmable Read-Only Memory EEPROM2-40. DUART Dual Universal Asynchronous Receiver/transmitter Circuit 2-42. Clock Filter Circuit 2-43. CPU to Rear Panel Interface2-44. CPU to Front Panel Interface 2-45. Fan Monitor 2-46. Front Panel Assembly A2 2-47. Clock Regeneration Circuitry2-48. Refresh Failure Detect Circuitry 2-49. Decoding and Timing Circuitry 2-50. Control Display Circuitry êêêêêêê 2-51. Output Display Circuitry 2-52. Keyboard Scanner Circuitry 2-53. Knob Encoder Circuitry 2-55. Keyboard Assembly A1 2-54. Led Circuitry 2-56. Analog Section Detailed Circuit Description 2-57. Filter/PA Supply A18, Low-voltage Filter/Regulator Section 2-58. Unregulated OSC Supplies 2-59. Unregulated LH Supplies2-60. Unregulated S Supplies 2-61. Triac Circuit 2-66. ±PA Supplies Digital Control 2-65. Filter/PA Supply A18, Power Amplifier Output Supply Section2-64. FR2 Supplies Figure 2-6. Power Amplifier Output Supply Simplified Schematic ahp005f.eps 2-67. ±250V and ±500V Supplies 2-68. +PA and -PA Supplies2-69. ±PA Supply Current Limit ∙ PA CT is the center tap 2-72. Regulated OSC Supplies 2-70. Regulator/Guard Crossing Assembly A172-71. Voltage Regulator Circuitry 2-73. Regulated LH Supplies 2-74. Regulated S Supplies+15 OSC -15 OSC +5RLH +5LH -5LH +44S -44S +17S -17S 15S +30FR1 +30FR2 +15V +5.975V +5.1V +44.15V +17.000V -17.000V +30.96V +30.96V 2-75. FR1 Supply 2-76. FR2 Supply 2-78. Inguard CPU Memory Map 2-79. Inguard Memory Configuration2-77. Guarded Digital Control Circuitry 2-81. Inguard Watchdog Timer 2-82. Power-Up and Reset Circuitry2-80. Inguard Clock Circuit 2-83. Break Detection 2-86. Inguard CPU Interrupts 2-87. Switch Matrix Assembly A82-85. Interface to Guarded Digital Bus 2-88. Switch Matrix Digital Control Figure 2-7. Switch Matrix Assembly Simplified Schematic System Interconnection Detailed Circuit Description 2-89. Switch Matrix Operation 11V DC and 22V DC Ranges 3. Apply 7V to the relay coils by setting PC5 high Figure 2-8. Switch Matrix Configuration for 11V DC and 22V DC Ranges ahp006f.eps 2-90. Switch Matrix Operation 2.2V AC and 22V AC Ranges 2-91. Switch Matrix Operation 220V AC and DC Ranges Figure 2-9. Switch Matrix Configuration for 2.2V and 22V AC Ranges ahp007f.eps Figure 2-10. Switch Matrix Configuration for 220V DC and AC Ranges ahp008f.eps 2-92. Switch Matrix Operation 2.2V DC Range Figure 2-11. Switch Matrix Configuration for 2.2V DC Range ahp009f.eps To calibrate the offset 2-94. Switch Matrix Operation 220 mV DC Range2-93. Calibration of the 2.2V Range Figure 2-12. Calibration of the 2.2V DC Range ahp010f.eps Figure 2-13. Switch Matrix Configuration for 220 mV DC Range ahp011f.eps 2-97. Calibration of the mV Ranges 2-95. Switch Matrix Operation 220 mV AC Range2-96. Switch Matrix Operation 2.2 mV and 22 mV AC Ranges Figure 2-14. V AC, 2.2 mV AC, and 22 mV AC Range ahp012f.eps Figure 2-15. Divider Calibration ahp013f.eps 2-98. Internal CAL Zero Amplifier Figure 2-16. Divider Gain Calibration ahp014f.eps 2-101. Basic DAC Theory of Operation 2-99. Switch Matrix 5725A Amplifier Interface2-100. DAC Assembly A11 0.1 x 13V + 0.5 x 0.78 mV = Figure 2-17. DAC Assembly Simplified Schematic ahp015f.eps Programmable Peripheral Interface IC U31 is the heart of this circuit 2-102. DAC Assembly Digital Control2-103. DAC Assembly Reference Circuitry 2-104. Duty-Cycle Control Circuit REFCOM 2-105. DAC Filter Circuit2-106. DAC Output Stage 2-107. Sense Current Cancellation Circuit 2-108. Linearity Control Circuit 2-111. DAC Buffered Reference Sip 2-110. DAC Output Switching2-109. Negative Offset Circuit 2-114. ADC Input Selection 2-112. Calibration Hardware2-113. ADC Amplifier 2-115. ADC Circuit ∙ ADC reference voltage ∙ ADC dac ∙ ADC comparator/amplifier Figure 2-18. ADC Circuit Measurement Functions ahp016f.eps INPUT 2-117. DAC Assembly Calibration2-116. How the DAC is Used in Calibration 2-119. Oscillator Control Assembly A12 2-118. Oscillator Section Overview 2-120. Oscillator Control Digital Control 2-121. Oscillator Input Switching2-122. Sense Current Cancellation 2-124. Error Integrator 2-123. Averaging Converter2-125. Three-Pole Filter 2-126. Analog Amplitude Control Loop Figure 2-19. Oscillator Control Analog Control Loop ahp017f.eps 2-127. AC/DC Thermal Transfer Circuit Figure 2-20. AC/DC Thermal Transfer Circuit ahp018f.eps 2-128. Oscillator Calibration 2-130. Oscillator Output Assembly A13 2-129. AC/DC Frequency Response Characterization Figure 2-21. Quadrature RC Oscillator Circuit ahp019f.eps 2-131. Oscillator Output Digital Control 2-132. Quadrature RC Oscillator 2-134. Phase−locked Loop 2-133. Oscillator Amplitude Control 2-136. Oscillator Wideband Smd Assembly A13A1 2-135. 2.2V and 22V Range Output Amplifier 2-137. Output Stage 2-138. Phase Shifter2-139. Power Amplifier Assembly A16 2-140. Power Amplifier Digital Control Sip Assembly A16A1 1. Write the proper data for these relays to port A of the 82C55 U11 2-141. PA Common Circuitry 2-142. +PA and -PA Supplies2-143. PA Input Stage ∙ ±185V ∙ ±365V 2-144. PA Mid Stage 2-145. PA Output Stage 2-148. PA Operation 220V DC Range 2-146. PA Sense Current Cancellation Circuitry2-147. PA in Standby Figure 2-22. Power Amplifier Simplified Schematic ahp020f.eps 2-150. High Voltage Assembly Support Mode 2-149. PA Operation 220V AC Range2-151. High Voltage AC 1100V Range 2-152. High Voltage DC 1100V Range and Current 2.2A Range 2-153. 220V DC Internal Calibration Network 2-154. PA Calibration Figure 2-23. Power Amplifier DC Calibration Network ahp021f.eps Power Amplifier dc gain of approximately -20 is calibrated next. The Power Amplifier is configured as in the 220V dc operation, except the input is connected to the DAC’s 6.5V reference BRF6 and BSRF6 by U2C and U2D respectively. The resulting -130V at the Power Amplifier output is connected to the 175 kΩ end of the internal cal resistor network by relay K3. The 25 kΩ end of this network is connected to DAC OUT HI and DAC SENSE HI by relay K1. The output of the internal cal amplifier is connected to the DAC’s adc circuit as in the previous steps, and the DAC OUTPUT is adjusted until checkpoint is measured by the adc circuit. Since the exact attenuation of the resistor networks is already known, the exact Power Amplifier output voltage can be calculated. This in turn gives the exact Power Amplifier dc gain, since the exact value of 6.5V reference BSRF6 is known Figure 2-24. Power Amplifier Calibration AC Attenuator f2-24.eps 2-155. High Voltage Assemblies A14 and A15 2-156. 1100V AC Range Figure 2-25. High Voltage/High Current Assembly 1100V AC Range ahp022f.eps 2-159. HV DC Output Series Pass and Current Limit Circuit 2-158. HVDC Power Supply Filter Circuit2-157. 1100V DC Range Figure 2-26. High Voltage/High Current Assembly 1100V DC Range ahp023f.eps 2-160. DC HV Amplifier/AC Sense Buffer 2-161. 2.2A Range Figure 2-27. High Voltage/High Current Assembly 2.2A AC and DC Ranges ahp024f.eps 2-162. 2.2A Power Supply Filter Circuit 2-163. High Voltage Digital Control 2-164. High Voltage Calibration 2-165. Calibration of the AC Function Figure 2-28. High Voltage/High Current Assembly Calibration ahp025f.eps 2-166. Calibration of the Current Function 2-167. High Voltage Magnitude Control ahp026f.eps 2-168. Ohms Overview 2-169. Ohms Main Assembly A10 2-170. Selection of Resistance Values Figure 2-30. Ohms Assemblies Simplified Schematic ahp38f.eps ahp39f.eps Figure 2-31. Ohms Main Assembly Simplified SchematicAnalog Selection Detailed Circuit Description 2-171. Ohms Main Assembly Support of Current Function Calibration 2-173. Ohms Cal Assembly A92-172. Ohms Digital Control 2-174. Ohms CAL Digital Control 2-176. Two-Wire Ohmmeter Compensation Circuit 2-175. 1, 1.9, and Short Resistance Figure 2-32. Two-Wire Lead Drop Compensation Circuit ahp027f.eps 2-177. Two-Wire Compensation Power Supplies 2-178. High Side Cancellation2-179. Low Side Cancellation 2-180. Ohms Calibration Figure 2-33. Calibration to an External 10 kΩ Standard ahp028f.eps 2-181. Calibrating to the External 10 KW Standard 2-184. Completion of High Resistance Value Calibration 2-182. Calibrating 10 KW and 19 KW2-183. Calibrating 100 KW The 10Ω, 19Ω, 100Ω and 190Ω resistance values are determined using 2V from the 2/5/10V source and using internal 101 divider Z5 in conjunction with the DAC. To get 2V, Q2 and Q3 are both turned on, which parallels both the 11.535 kΩ value and the 3.846 kΩ value with the 50 kΩ value. The lower voltage is required to lower the power dissipation in the resistors Figure 2-34. Ratio Calibration, 10 Ω From 100 Ω ahp029f.eps 2-186. Current/High Resolution Oscillator Assembly Overview A7 2-185. Calibrating to the External 1W Standard 2-188. Current Input Switching 2-187. Current Section Figure 2-35. Current Output Simplified Schematic ahp030f.eps 2-191. Shunt Resistors 2-189. Complementary Drive Circuit2-190. Transconductance Amplifiers 2-193. Current Output Switching 2-192. Feedback Loop2-194. Generation of the 2.2A Range Table 2-15. Relay Settings for Current Range Selection Range 2-198. Current Assembly Calibration 2-195. Current Guard Buffer2-196. Compliance Limiter 2-197. Current/Compliance Voltage Monitor Figure 2-36. Current Assembly Calibration ahp031f.eps 2-199. High-Resolution Oscillator Section ∙ 10.00 Hz to 119.99 Hz ∙ 0.1200 kHz to 1.1999 kHz 2-201. Phase-Locked Loop 2-200. Reference Frequency Amp/Divider 2-202. 5-500k Output Divider 2-203. Hi-Res Output Switching2-204. Rear Panel Assembly A21 ∙ RPDUARTCS*, D00000-D0001F ∙ RPIEEECS*, D00020-D0002F 2-205. Rear Panel Power Supplies2-206. Rear Panel Address Mapping 2-209. RS-232C Interface 2-207. Clock Regeneration Circuit2-208. IEEE-488 GPIB Interface 2-211. 5725A Interface 2-212. Phase Lock In/Variable Phase out2-210. Auxiliary Amplifier Interface Port A PA0-PA7 provides the input lines for relay driver U16 2-213. Rear Panel Relay Control2-214. Rear Panel CPU Interface 2-216. Wideband Oscillator Assembly A6 2-217. Wideband Oscillator Power Supplies2-215. Wideband AC Module Option 2-218. Wideband Oscillator Digital Control 2-219. Phase-Locked Loop and Divider Circuit 2-220. Amplitude Control Amplifier and X10 Wideband Amplifier 2-221. Wideband Oscillator Filters 2-222. Wideband Output Assembly A5 Figure 2-37 is a simplified schematic for the Wideband Output assembly Figure 2-37. Wideband Output Assembly Simplified Schematic ahp032f.eps 2-223. Wideband Output Power Amplifier Circuit 2-226. Wideband Output Overload Control Circuit 2-224. Wideband Output Attenuators2-225. Wideband Output RMS Sensor and Amplitude Control Circuit 2-227. Wideband Output Digital Control 2-228. Wideband Output Calibration connector is connected back to the OUTPUT HI SENSE and OUTPUT LO SENSE binding posts Service Manual Calibration and Verification 3-30 3-1. Introduction Calibration and Verification 3-2. Accessing the Fuse 3-3. Cleaning the Air Filter Cleaning the Air Filter 3-6. Calibrating the 5700A/5720A Series II to External Standards 3-4. Cleaning the Exterior3-5. Calibration Calibrating the 5700A/5720A Series II to External Standards 3-8. When to Adjust the Calibrator’s Uncertainty Specifications3-7. Calibration Requirements 3-9. Calibration Procedure 4. Enter the ambient temperature then press E. The display shows 5. Connect the 732B to the calibrator as shown in FigureFigure 3-3. 732B External Calibration Connections 732B DC STANDARD IF3-7.EPS IF3-5.EPSIF3-6.EPS After a few seconds, the following display appears RESISTANCE STANDARD CALIBRATORFigure 3-4. 742A-1 and 742A-10k External Calibration Connections F7-4.EPS 16. Set the rear panel CALIBRATION switch to NORMAL 3-10. Range Calibration 4. Press the “DC V” softkey to bring up the next menu shown below PREV MENU IF057.EPS 3-11. Calibrating the Wideband AC Module Option 5700A-03 Calibrating the Wideband AC Module Option 5700A-03 2. Press the “Cal “ softkey to bring up the following menu 4. Press the “Gain” softkey to bring up the following display 3-12. Performing a Calibration Check Press Pto exit the calibration menus 3-13. Full Verification Figure 3-7. Overview of Verification Tests 3-15. Warm-up Procedure for All Verification Tests 3-14. Required Equipment for All Tests Table 3-2. List of Required Equipment for Main Output EquipmentApplication Equipment Required for Wideband Ac Module Option 5700-03 Verification 3-16. Resistance Verification Test 13. The low-value 1Ω, 1.9Ω, and 10Ω tests are summarized in Table 3-17. Two-Wire Compensation Verification 3-18. DC Voltage Verification Test 3-19. DC Voltage One-Tenth Scale Linearity Test 3-20. Direct Current Accuracy Verification Test 3-21. AC Voltage Frequency Accuracy Test 3-22. Output Level Tests For AC V Ranges Use Table 3-23 5720A or Table 3-24 5700A for the test records 3-23. AC Current Test, 22 mA to 11A Ranges Table 3-8. 5790A Adjustment Counts5790A Adjustment Counts 5700A/5720A Series II Output Level 1. Connect the equipment as shown in Figure 3-12A use the 2A shunt Figure 3-12. Alternating Current Test Setup A. Alternating Current Test Setup, 22 mA to 2A Using 5790A InputB. Alternating Current Test Setup, 10A Using 5790A Input 5790A 3-24. AC Current Test, 2 mA and 200 μA Ranges Hi Output LoMetal Film Resistor Mounted on Dual Banana Plug 200 Pomona Cable 1362-A-18 Figure 3-15. Metal Film Resistor in Test Circuit 3-25. Rationale for Using Metal-Film Resistors to Measure AC CurrentFigure 3-14. Metal Film Resistor Equivalent Circuit 3-26. Wideband Frequency Accuracy Test 3-27. Wideband AC Voltage Module Output Verification 3-28. Wideband Output Accuracy at 1 kHz Test Wideband Output Accuracy at 1 kHz Test 3-29. Wideband Output Flatness Test 3-30. Wideband Flatness Calibration Procedure 3-31. Optional Tests 3-32. DC Voltage Load Regulation Test Optional Tests 3-33. DC Voltage Linearity Test3-34. DC Voltage Output Noise 10 Hz to 10 kHz Test 2. Set the Oscilloscope Differential Amplifier controls as shown below 3-37. Wideband Distortion Testing 3-35. DC Voltage Output Noise 0.1 to 10 Hz Test3-36. AC Voltage Distortion Test WWarning 3-39. Minimum Use Requirements 3-38. AC Voltage Overshoot Test Minimum Use Specifications Minimum Use RequirementsTable 3-15. Minimum Use Requirements Calibration Equipment 3-40. Determining Test Limits for Other Calibration Intervals 130 + 1000000*0.000000040/0.002=130 ppm + 20 ppm = 150 ppm DMM Error 1Ω Std Res Value1Ω Std Voltage Measured 1Ω Std Voltage UUT True Res Value Table 3-16. 5720A Resistance Test Record contDMM UUT Res Value Table 3-17. 5700A Resistance Test Record UUT 1Ω Displayed ValueUUT 1Ω Voltage UUT True Res Table 3-17. 5700A Resistance Test Record cont Max Difference of Characterized to Nominal Value Divider Setting Table 3-18. DC Voltage Test Record for 5720A5720A Range 5720A Output 5700A Output Table 3-19. DC Voltage Test Record for 5700A5700A Range UUT Error SettingError A+B Table 3-20. Direct Current Accuracy Test Record 5720A Table 3-21. Direct Current Accuracy Test Record 5700A 5725A Amplifier DC Current TestTest Limit 90-day ppm DC DMM Reading Error Display Reading Table 3-23. 5720A AC Voltage Output Test RecordOutput Level Error Output LevelTable 3-23. 5720A AC Voltage Test Record cont Display Table 3-24. 5700A AC Voltage Output Test Record Table 3-24. 5700A AC Voltage Output Test Record cont Table 3-25. AC Voltage 2 mV Range Test RecordCharacterized 1.9 mV Reading Limits UUT Error Display Calculated ErrorTable 3-26. 5720A AC Current 20 mA to 10A Accuracy Test Record 2A, 200 mA, 20 mA and 10A Test Record Specs ±ppm Table 3-27. 5700A AC Current 20 mA to 10A Accuracy Test Record2A, 200 mA, 20 mA and 10A Test Record 10A Only for 5725A Table 3-28. 5720A AC Current 2 mA and 200 μA Accuracy Test Record Spec ± ppm 90-day5790A Transfer Spec ± ppm Test Limits ± ppm Table 3-30. Wideband Frequency Accuracy Test Record Frequency HzFrequency Measured Tolerance Limits Measured Error Measured Flatness ErrorTable 3-31. Wideband Accuracy at 1 kHz Test Record 5790A 1-Year Spec ± ppm Table 3-32. Wideband Flatness Test Record cont Table 3-33. Wideband Absolute Error 10 Hz to 500 kHz 1 kHz Absolute Error ppmFlatness Error ppm Error Sum ppm Div. Setting Kelvin-Varley SettingTable 3-34. Load Regulation Test Record 5700A/5720A Series Range UUT Error Display Reading Table 3-37. AC V Distortion Test Summary5700A/5720A Series II Output Load Resistors Fluke Corporation A Message Fromstatic awareness 5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT Maintenance Title Service Manual 4-2. Cleaning the Air Filter 4-1. Introduction 4-3. General Cleaning 4-4. Cleaning PCA’s4-5. Access Procedures 4-9. Rear Panel Removal and Installation 4-10. Rear Panel Assembly Access 4-11. Front Panel Removal and Installation 4-12. Display Assembly Removal and Installation 4-13. Keyboard Assembly Removal and Installation 4-14. Analog Assembly Removal and Installation Figure 4-5. Analog and Digital Assemblies FRONT PANEL 4-18. Front/Rear Binding Post Reconfiguration 4-15. Digital Assembly Removal and Installation4-16. Power Transformer Removal and Installation 4-17. Hybrid Cover Removal 6. Install the Front Panel 4-20. Clearing Ghost Images from the Control Display 4-19. Installing a Wideband AC Module Option4-21. Replacing the Clock/Calendar Backup Battery 4-22. Using Remote Commands Reserved for Servicing 4-23. Using the ETIME CommandUsing The Fatality? and Fatalclr Commands ETIME Response FATALITY?FATLCLR? Service Manual Troubleshooting Service Manual 5-2. Interpreting Diagnostic Fault Codes 2701 A7 8255 Port a Fault2702 A7 8255 Port B Fault 2703 A7 8255 Port C Fault 2705 A7 Oven Regulation Fault 2706 A7 Current Compliance Fault2707 A7 Hardware Initialization Fault 2709 A7 Current Magnitude Fault 2718 Fault In Setting Up AC For Diagnostics 2719 A7 8255 Was Reset2713 A7 Hi-Res Loop In 100Hz Range 2714 A7 Hi-res Loop In 1kHz Range 2801 A11 8255 Port a Wires 2802 A11 8255 Port B Data Bus2803 A11 8254 Status Words 2804 A11 DAC Heaters Not Regulated 2808 A11 ADC Amp Gain Error 2809 A11 DAC Monitoring Fault2810 A11 +11V DC Range Fault 2811 A11 -11V DC Range Fault 2815 A11 6.5V Reference Fault 2816 A11 13V Buffered Reference Fault2817 A11 13V Reference Fault 2818 Assembly A11 Missing 2822 A8/A11 -11/22V DC Zero Estimate Fault 2826 A11 A/D Overload Fault3101 A14 8255 Port a Fault 3102 A14 8255 Port B Fault 3103 A14 8255 Port C Fault 3104 A15 HV Oven Regulation Fault3105 A15 HV I Oven Regulation Fault 3106 A15 DC HV Amp Noise Fault 3109 A15 HV +DC Preamplifier Fault 3110 A15 HV +DC Series Pass & Current Fault3111 A15 HV +DC High Voltage Output Fault 3112 A15 HV +DC Ref/error Amplitude Fault 3116 A15 HV -DC Reference/error Amp Fault 3117 A14/A15 HV +DC Current Error Amp Fault3118 A14/A15 HV -DC Current Error Amp Fault 3119 A14/A15 HV +DC Current Abs. Value 3126 A14/A15 HV AC 100Hz, Preamp Fault 3122 A14/A15 HV AC 1kHz, Preamp Lo3123 A14/A15 HV AC 1kHz, Preamp Mid 3124 A14/A15 HV AC 1kHz, Preamp Hi 3128 A14/A15 HV AC 1kHz, Output Lo 3129 A14/A15 HV AC 1kHz, Output Mid3130 A14/A15 HV AC 1kHz, Output Hi 3131 A14/A15 HV AC 100Hz, Output Lo 3135 Assembly A14 Not Responding 3136 A14 8255 Was Reset3137 A14/A15/A16 2.2A AC Range Mag. Fault 3134 Spare 3301 A9 8255 Port a Fault 3302 A9 8255 Port B Fault3140 A14/A15/A16 2.2A AC Range Abs. Value 3141 A14/A15/A16 2.2A DC Range Dummy Load 3303 A9 8255 Port C Fault 3304 A9 10V Source Fault3305 A9 5V Source Fault 3306 A9 2V Source Fault 3309 A9 Diff Amp Gain Fault 3310 A9 Diff Amp Noise Fault3311 A9/A10 Ohms 101 Divider Fault 3312 A9/A10 Ohms 11 Divider Fault 3315 A9/A10 10 Ohm Cal Diag Fault 3316 A9/A10 19 Ohm Cal Diag Fault3317 A9/A10 100 Kilohm Ratio Fault 3318 A9/A10 190 Kilohm Ratio Fault 3321 A9/A10 10M Ohm Ratio Fault 3324 A9/A10 100M Ohm Ratio Fault3325 A9/A10 10 Kilohm Check Fault 3326 A9/A10 19 Kilohm Check Fault 3327 A9/A10 1 Kilohm Check Fault 3328 A9/A10 1.9 Kilohm Check Fault3329 A9/A10 100 Ohm Check Fault 3330 A9/A10 190 Ohm Check Fault 3334 A9/A10 1.9 Ohm Check Fault 3335 A9/A10 Ohms Short Check Fault3336 A9/A10 2 Wire Compensation Fault 3337 A9/A10 Ohms Correction Factor Fault 3341 A9/A10 190 Ohm Cal Diag Fault 3400 A12 8255 Control Word3401 A12 8255 Port A 3402 A12 8255 Port B 3408 A13 Fixed Ampl. Osc Fault 3409 A13 Phase Lock Loop Fault3410 A12/A13 22V Amp Bias Adj Error 3412 A12 To A13 Interface Fault 3416 A12/A13 DAC 15th Bit Fault 3417 A12 DC Sensor Buffer Fault3418 A12 Sensor Loop/SQ. Root Amp Fault 3414 A12/A13 Nonlinear Control Loop 2vrng 3423 Assembly A12 Missing 3424 Assembly A13 Missing3425 Assembly A12 Or A13 Not Responding 3426 A12 8255 Was Reset 3508 A16/A14 220V AC Range Output Fault 3510 A16 220V Amp Fault3503 A16 8255 Port C 3504 Spare 3520 A16 PA Oven Regulation Fault 3511 A16 Incorrect PA Input3512 Spare 3513 Spare 3521 Assembly A16 Is Not Responding 3524 A16 Power Amp Is Too Hot3525 220V DC Initialization Fault 3526 220V AC Initialization Fault 3530 A16 8255 Was Reset 3600 +17S Supply Fault3601 -17S Supply Fault 3602 +15S Supply Fault 3605 -42S Supply Fault 3606 LH Com Ground Fault3607 -5lH Supply Fault 3608 +5rLH Supply Fault 3611 -PA Supply Fault 3612 +15 OSC Supply Fault3613 -15 OSC Supply Fault 3614 OSC Com Ground Fault 3615 S Com Ground Fault 3701 A21 8255 Port A Fault3702 A21 8255 Port B Fault 3703 A21 8255 Port C Fault 3801 A8 8255 Port A Fault 3802 A8 8255 Port B Fault3803 A8 8255 Port C Fault 3804 A8 Zero Amp Lo Noise Fault 3809 A8 Zero Amp Hi Gain Fault 3810 A8 2.2V Amp Noise Fault 3811 A8 Zero Amp Offset3812 A8 2.2V Gain Fault 3813 A8 220mV Offset Fault 3814 A8 220mV Divider Fault 3815 A8 22mV Divider Fault 3816 Spare 3824 A8 Oven Regulation Fault 3825 Assembly A8 Not Responding3826 A8 8255 Was Reset 3827 Assembly A8 Too Hot 3900 A5 8255 Control Word 3905 A6 Phase Lock Loop At 10MHz 3906 A6 Phase Lock Loop At 30MHz3907 A5 Rms Sensor At 10MHz 3908 A5 Rms Sensor At 30MHz 3914 A5 0DB Output Attenuation Fault 3915 A5 10DB Output Attenuation Fault3911 A5/A6 Ampl. Control At 30MHz 3912 A5/A6 Output Offset At 10MHz 3916 A5 20DB Output Attenuation Fault 3917 A5 30DB Output Attenuation Fault3918 A5 40DB Output Attenuation Fault 3922 A5/A6 Wideband Initialization Fault 5-4. Troubleshooting the Wideband Output Assembly A5 5-3. Component-level Troubleshooting3923 A5 8255 Was Reset Component-level Troubleshooting 5-5. Troubleshooting the Wideband Oscillator Assembly A6 All measurements are referenced to SCOM TP16 or TP17 and all Figure 5-2. Waveform at TP1 F5-2.EPS Figure 5-3. Waveform at TP15 F5-3.EPS Figure 5-4. Waveform at Pins 14 and 15 of U1 F5-4.EPS 10 ms F5-5.EPS 5-6. Troubleshooting the Current/Hi-Res Assembly A7 5-7. Current Section Figure 5-6. Waveform at Pin 11 of K2 F5-6.EPS Figure 5-7. Waveform at Pin 6 of K2 1.2 ΩK5C, K5D K10, K13 F5-9.EPS F5-10.EPS F5-11.EPS 5-8. Hi-Res Oscillator Section All measurements are referenced to LHCOM TP18 Figure 5-13. Waveform at TP12 F5-13.EPS 5-9. Troubleshooting the Switch Matrix Assembly A8 Figure 5-15. Waveform at TP16 F5-15.EPS 5-10. Troubleshooting the Ohms Cal Assembly A9 5-11. Two-wire Compensation Circuit 5-12. Troubleshooting the Ohms Main Assembly A10 5-13. Troubleshooting the DAC Assembly A11 Figure 5-17. Waveform at TP6 Figure 5-18. Waveform at TP4, Calibrator Set toF5-17.EPS F5-18.EPS Figure 5-19. Waveform at TP4, Calibrator Set to F5-19.EPS Figure 5-20. Waveform at TP7 F5-20.EPS Figure 5-21. Waveform at TP5 F5-21.EPS 5-14. Duty-cycle Control Circuit Figure 5-22. Waveform at Pin 10 of U6 F5-22.EPS Figure 5-23. Waveform at Pin 6 of U13 Figure 5-24. Waveform at Pin 4 of U10F5-23.EPS F5-24.EPS U11, Q30, Q31, Q32, and their associated components 5-15. ADC Circuit 5-16. Buffered Reference SIP Assembly A11A2 5-17. Troubleshooting the Oscillator Control Assembly A12 Figure 5-27. Waveform at Anode of CR4 Figure 5-28. Waveform at Pin 6 of U11F5-27.EPS F5-28.EPS Figure 5-29. DC Sense Buffer Waveform TP6 F5-29.EPS 5-18. Troubleshooting the Oscillator Output Assembly A13 ∙ TP5 positive voltage ∙ TP4 negative voltage ∙ TP3 positive voltage 5-19. Troubleshooting the High Voltage Control Assembly A14 Figure 5-31. Waveform at TP3 F5-31.EPS 5-20. Magnitude Control Circuit 5-21. Troubleshooting the High Voltage/High Current Assembly A15 operation refer to Figure 2-25 in the Theory of Operation section. During normal operation in the 1100V ac mode, internal software monitors the output and makes corrections or trips the instrument into standby. This internal monitoring can cause difficulty when troubleshooting a faulty High Voltage assembly. If during the next step 8 the instrument keeps tripping into standby, defeat the monitoring by connecting a jumper from TP9 to TP10 on the DAC assembly 5-22. Troubleshooting the Power Amplifier Assembly A16 Figure 5-32. Waveform at Pin 18 of Hybrid H4 Figure 5-33. Power Amplifier with Calibrator Set to 22V at 1 kHz AC elsewhere in the Calibrator Remove any jumpers left in place from step 8 before continuing 5-23. Troubleshooting the Filter/PA Supply Assembly A18 J201. The +PA supply at +180Vshould go into current limit. The oscilloscope should show a repeating pattern in which the +PA supply climbs to about +180V then drops to 0V. If a failure is detected, check Q203, VR246, VR213, U201C, and associated components Service Manual List of Replaceable Parts Service Manual 6-2. How to Obtain Parts A * symbol indicates a device that may be damaged by static discharge6-1. Introduction 6-3. Manual Status Information 6-5. Service Centers Manual Status Information Assembly NameRef or Option No Fluke Service Centers Table 6-1. Front Panel Final AssemblyReference Description Designator Fluke Stock No f6-1.eps Figure 6-1. Front Panel Final Assembly5700A-T&B Table 6-1. Chassis Final Assembly Figure 6-2. Chassis Final Assembly 5700A T&B1 of f61a1.eps Figure 6-2. Chassis Final Assembly cont f61a2.eps Table 6-1. Rear Panel Final Assembly Figure 6-3. Rear Panel Final Assembly f61b.eps ISOLATOR,OPTO,OPTICAL SWITCH,INFRARED Table 6-2. A1 Keyboard PCACR1-4 DT1, DT2 W1 LED,GREEN,SUBMINIATURE 5700A-1603 Figure 6-4. A1 Keyboard PCA Table 6-3. A2 Front Panel PCA Designator Table 6-3. A2 Front Panel PCA cont 57001602.EPS 5700A-1602Figure 6-5. A2 Front Panel PCA Table 6-4. A3 Analog Motherboard PCA 5700A-1601 Figure 6-6. A3 Analog Motherboard PCA Table 6-5. A4 Digital Motherboard PCA 57001605.EPS 5700A-1605Figure 6-7. A4 Digital Motherboard PCA Table 6-6. A5 Wideband Output PCA, Option Table 6-6. A5 Wideband Output PCA, Option -03 cont R69,R70 R72,R73,R80-83 R74 R75 R78,R79,R86-89 R92-95 R96-99 R100 R101 57001611.EPS 5700A-1611Figure 6-8. A5 Wideband Output PCA, Option Table 6-7. A6 Wideband Ocillator PCA, Option CONNECTOR ,CONN,DIN41612,TYPE C,RT ANG,64 PIN Table 6-7. A6 Wideband Ocillator PCA, Option -03 cont R58,R112,R212 R312,R412,R512 R59 R61 R62,R64,R65,R69 R63 R68 R71 57001610.EPS 5700A-1610Figure 6-9. A6 Wideband Oscillator PCA, Option Table 6-8. A7 Current/High-Res Oscillator PCA Table 6-8. A7 Current/High-Res Oscillator PCA cont Service Centers 57001621.EPS 5700A-1621Figure 6-10. A7 Current/HIgh-Res Oscillator PCA Table 6-9. A8 Switch Matrix PCA Reference Designator Table 6-9. A8 Switch Matrix PCA cont 57001622.EPS Figure 6-11. A8 Switch Matrix PCA5700A-1622 Table 6-10. A9 Ohms Cal PCA Table 6-10. A9 Ohms Cal PCA cont 57001631.EPS 5700A-1631Figure 6-12. A9 Ohms Cal PCA Table 6-11. A10 Ohms Main PCA 57001630.EPS 5700A-1630Figure 6-13. A10 Ohms Main PCA Table 6-12. A11 DAC PCA C110,C111 CR1,CR3-6,CR8, CR12,CR13 CR2 Table 6-12. A11 DAC PCA cont Table 6-12. A11 DAC PCA cont VR13 VR18,VR22 VR25 VR26 VR27 VR28 VR29 VR33,VR34 X1 Z2 Z4 Z5 Z8 Z10 57001640.EPS 5700A-1640Figure 6-14. A11 DAC PCA Table 6-13. A11A1 DAC Filter SIP PCA 5700A-1643 Figure 6-15. A11A1 DAC Filter SIP PCA Table 6-14. A11A2 DAC Buffered Reference SIP PCA 5700A-1644 Figure 6-16. A11A2 DAC Buffered Reference SIP PCA Table 6-15. A12 Oscillator Control PCA Table 6-15. A12 Oscillator Control PCA cont Stock Designator 57001650.EPS 5700A-1650Figure 6-17. A12 Oscillator Control PCA Table 6-16. A13 Oscillator Output PCA Table 6-16. A13 Oscillator Output PCA cont 5700A/5720A Series II Calibrator 57001651.EPS 5700A-1651Figure 6-18. A13 Oscillator Output PCA Table 6-17. A13A1 Oscillator Wideband SMD PCA 5700A-1652 Figure 6-19. A13A1 Oscillator Wideband SMD PCA Table 6-18. A14 High Voltage Control PCA Table 6-18. A14 High Voltage Control PCA cont 57001661.EPS 5700A-1661Figure 6-20. A14 High Voltage Control PCA Table 6-19. A15 High Voltage/High Current PCA Table 6-19. A15 High Voltage/High Current PCA cont 57001660.EPS 5700A-1660Figure 6-21. A15 High Voltage/High Current PCA Table 6-20. A16 Power Amplifier PCA CR20,CR21,CR23 Table 6-20. A16 Power Amplifier PCA cont R9,R10,R16,R33, R40,R50 R59, R115,R148 R149 R11,R12 Table 6-20. A16 Power Amplifier PCA cont 57001670.EPS Figure 6-22. A16 Power Amplifier PCA5700A-7670 Table 6-21. A16A1 Power Amplifier Digital Control SIP PCA Figure 6-23. A16A1 Power Amplifier Digital Control SIP PCA 5700A-1671 Table 6-22. A17 Regulator/Guard Crossing PCA Table 6-22. A17 Regulator/Guard Crossing PCA cont 57001680.EPS 5700A-1680Figure 6-24. A17 Regulator/Guard Crossing PCA Table 6-23. A18 Filter/PA Supply PCA CR1,CR2,CR04, CR5 CR8,CR10, CR12,CR13 Table 6-23. A18 Filter/PA Supply PCA cont VR211,VR217 VR227,VR231 VR212,VR216 VR226,VR232 VR214,VR230 57001690.EPS 5700A-7690Figure 6-25. A18 Filter/PA Supply PCA Table 6-24. A19 Digital Power Supply PCA C24,C25 CR1-4,CR9-12 CR8,CR16, CR21- 24,CR29-34 Table 6-24. A19 Digital Power Supply PCA cont 57001604.EPS Figure 6-26. A19 Digital Power Supply PCA5700A-1604 Part Number Table 6-25. A20 CPU PCARef Des Table 6-26. A20 CPU PCA cont Figure 6-27. A20 CPU PCA 57001606.EPS Table 6-27. A21 Rear Panel PCA Table 6-27. A21 Rear Panel PCA cont 57001609.EPS 5700A-1609Figure 6-28. A21 Rear Panel PCA Service Manual Schematic Diagrams Service Manual Schematic Diagrams Figure 7-1. A1 Keyboard PCA 5700A/5720A Series Figure 7-1. A1 Keyboard PCA cont Figure 7-2. A2 Front Panel PCA Figure 7-2. A2 Front Panel PCA cont Schematic Diagrams Figure 7-2. A2 Front Panel PCA cont Figure 7-2. A2 Front Panel PCA cont Service Manual5700A/5720A Series Schematic Diagrams Figure 7-3. A3 Analog Motherboard PCA Figure 7-23. A3 Analog Motherboard PCA cont Figure 7-3. A3 Analog Motherboard PCA cont Schematic Diagrams Figure 7-3. A3 Analog Motherboard PCA cont Figure 7-3. A3 Analog Motherboard PCA cont Figure 7-4. A4 Digital Motherboard PCA Figure 7-4. A4 Digital Motherboard PCA cont ahp46f.tif Figure 7-4. A4 Digital Motherboard PCA cont 5700A-1611 Figure 7-5. A5 Wideband Output PCA Option Figure 7-5. A5 Wideband Output PCA Option -03 cont Schematic Diagrams Figure 7-5. A5 Wideband Output PCA Option -03 cont Figure 7-5. A5 Wideband Output PCA Option -03 cont Figure 7-6. A6 Wideband Oscillator PCA Option 7-235700A-7610 Figure 7-6. A6 Wideband Output PCA Option Figure 7-6. A6 Wideband Oscillator PCA Option -03 cont Figure 7-6. A6 Wideband Oscillator PCA Option -03 cont Figure 7-7. A7 Current/High-Resolution Oscillator PCA 5700A-1621 Figure 7-7. A7 Current/High-Resolution Oscillator PCA cont Schematic Diagrams Figure 7-7. A7 Current/High-Resolution Oscillator PCA cont 5700A/5720A Series Figure 7-7. A7 Current/High-Resolution 7-315700A-1021 4 of Oscillator PCA cont Figure 7-8. A8 Switch Matrix PCA 5700A-1622 Figure 7-8. A8 Swith Matrix PCA cont Figure 7-8. A8 Switch Matrix PCA cont Schematic Diagrams Figure 7-8. A8 Swith Matrix PCA cont 5700A/5720A Series Service ManualFigure 7-8. A8 Switch Matrix PCA cont Schematic Diagrams Figure 7-9. A9 Ohms Cal PCA 5700A-1631 Figure 7-9. A9 Ohms Cal PCA cont Figure 7-9. A9 Ohms Cal PCA cont Service Manual5700A/5720A Series Schematic Diagrams Figure 7-9. A9 Ohms Cal PCA cont Figure 7-9. A9 Ohms Cal PCA cont Figure 7-10. A10 Ohms Main PCA Figure 7-10. A10 Ohms Main PCA cont Schematic Diagrams Figure 7-10. A10 Ohms Main PCA Figure 7-10. A10 Ohms Main PCA cont Service Manual5700A/5720A Series Schematic Diagrams Figure 7-11. A11 DAC PCA 5700A-7640 Figure 7-11. A11 DAC PCA cont 22uF R128C112 200K Schematic Diagrams 7-52 Schematic Diagrams Figure 7-11. A11 DAC PCA cont Figure 7-11. A11 DAC PCA cont Figure 7-12. A11A1 DAC Filter SIP PCA Figure 7-13. A1142 DAC Buffered Reference SIP PCA 5700A-7650 Figure 7-14. A12 Oscillator Control PCA cont 4. C5 AND C55 ARE NOT INSTALLED 3. ALL GND CONNECTIONS DENOTED WITHA 1 ARE BUSSED AND CONNECTED TO GND3 AT ONE POINT DG211 Schematic Diagrams 7-60 Figure 7-15. A13 Oscillator Output PCA Figure 7-15. A13 Oscillator Output PCA cont Schematic Diagrams Figure 7-15. A13 Oscillator Output PCA cont Figure 7-15. A13 Oscillator Output PCA cont Figure 7-16. A13A1 Oscillator Wideband SMD PCA Figure 7-16. A13A1 Oscillator Wideband SMD PCA cont Figure 7-17. A14 High Voltage Control PCA 7-68 Figure 7-17. A14 High Voltage Control PCA cont Figure 7-17. A14 High Voltage Control PCA cont Figure 7-17. A14 High Voltage Control PCA cont Service Manual5700A/5720A Series Schematic Diagrams Figure 7-18. A15 High Voltage/ High Current PCA 5700A-1660 Figure 7-18. A15 High Voltage/High Current PCA cont Figure 7-18. A15 High Voltage/High Current PCA cont Figure 7-19. A16 Power Amplifier PCA 5700A-7670 Figure 7-19. A16 Power Amplifier PCA cont 4. NOT INSTALLED 10 M 2N4044 Figure 7-19. A16 Power Amplifier PCA cont 7-78 Figure 7-20. A16A1 Power Amplifier Digitial Control SIP PCA Control SIP PCA cont Figure 7-20. A161A1 Power Amplifier Digital7-80 5700A-1680 Figure 7-21. A17 Regulator/Guard Crossing PCA Figure 7-21. A17 Regulator/Guard Crossing PCA cont Schematic Diagrams Figure 7-22. A18 Filter/PA Supply PCA 7-845700A-7690 Figure 7-22. A18 Filter/PA Supply PCA cont Figure 7-22. A18 Filter/PA Supply PCA cont Figure 7-23. A19 Digital Power Supply PCA Figure 7-23. A19 Digital Power Supply PCA cont Figure 7-24. A20 CPU PCA Figure 7-24. A20 CPU PCA cont Schematic Diagrams Figure 7-24. A20 CPU PCA cont Figure 7-24. A20 CPU PCA cont Service Manual5700A/5720A Series Schematic Diagrams Figure 7-24. A20 CPU PCA cont Figure 7-24. A20 CPU PCA cont Figure 7-25. A21 Real Panel PCA Figure 7-25. A21 Rear Panel PCA cont Schematic Diagrams Figure 7-25. A21 Rear Panel PCA cont Figure 7-25. A21 Rear Panel PCA cont Service Manual5700A/5720A Series Schematic Diagrams Figure 7-25. A21 Rear Panel PCA cont Figure 7-25. A21 Rear Panel PCA cont Figure 7-26. Hybrids Figure 7-26. Hybrids cont Schematic Diagrams Figure 7-26. Hybrids cont Figure 7-26. Hybrids cont Service Manual5700A/5720A Series Schematic Diagrams Figure 7-26. Hybrids cont Service Manual 5700A/5720A Series