HP-78100A-78101A-Manual 电路图.pdf

I . : HP Archive . . This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! . . On-line curator: Tony Gerbic RadioFans.CN 收音机爱 好者资料库 SERVICE M A N U A L TELEMETRY TRANSMITTER 78100A TELEMETRY RECEIVER 78101A HEWLETT K!J PACKARD RadioFans.CN 收音机爱 好者资料库 I 0781 00-2 HEWLETT PACKARD TELEMETRY - TRANSMITTER 78100A TELEMETRY RECEIVER 78101A TRANSMITTER SERIALS PREFIXED: 1549A RECEIVER SERIALS PREFIXED: 2220A This manual applies directly to HP Model 78100A Telemetry Transmitters with serial numbers prefNed 1549A, and HP Model 78101A Telemetry Receivers with serial numbers prefuted 2220A. OTHER PREFIXES: For serial numbers prefixed lower than 1549A and 2220A, see Appendix I. For serial numbers prefuted higher than 1549A and 2220A, see Manual Changes insert included with this manual. SERVICE MANUAL 781 01-9 1997 Copyright 1972 Hewlett-Packard Medical Electronics Division 175 Wyman Street Waltham, Massachusetts 02254 PRINTED DECEMBER 1983 RadioFans.CN 收音机爱 好者资料库 Models 78100A. 78101A I Table of Contents TABLE OF CONTENTS Paragraph Page SECTIONS I. 11. 111: GENERAL INFORMATION. INSTALLATION. OPERATION . 1 SECTION IV. PRINCIPLES OF OPERATION 4-1 4-1 . Introduction . 4-1 4.3 . Transmitter . 4-1 I 4-6 . ECG Amplifier . 4-1 4-1 1 . Slew Rate Limiter . 4-1 4.13 . Subcarrier Oscillator . 4-1 4.14 . Multivibrator Control Circuit . 4-1 4-1 5 . 4-1 8 . Subcarrier Filter . 4-2 4-20 . Carrier Oscillator . 4-2 4.22 . Transistor Frequency Doubler . 4-2 4.24 . 4.29 . Oscillator Bias and Shut Down . . . . . . . . . . 4-3 4-3 1 . Defibrillator Protection . . . . . . . . . . . . . . . 4-3 4.33 . Receiver . 4-3 ) 4.35 . High Frequency Board . 4-3 443 . Local Oscillator . 4-5 448 . Mixer Circuit . 4-5 4-5 1 . 4.58 . FM Discriminator Circuit . 46 4-6 1 . Low Frequency Board . 4-6 4-63 . Buffer Amplifier . 4-6 4-65 . Subcarrier Filter . 4-6 4-67 . 4-69 . Monostable Multivibrator . 4-7 4.71 . 4.75 . 4.78 . I . i I 4.9 . ECGGainStage . 4-1 Voltage-Controlled Multivibrator . 4-1 I 4.16 . Electrode Inoperative Circuit . 4-2 I Step-Recovery Diode Frequency Doubler . . . 4-2 4.26 . Power Supply . 4-2 4.38 . Radio Frequency Amplifier . 4-3 Intermediate Frequency Amplifier . 4-5 4-56 . AGCAmplifier . 4-6 Subcarrier Amplifier . 4-7 ECG Output Filter . 4-7 Output Amplifier . 4-8 RangelBattery Inoperative Circuit . 4.8 4-80 . Electrode Inoperative Circuit . . . . . . 4-8 4-84 . PowerSupply . 4-8 4-87 . AFCAmplifier . 4-9 4.93 . Status Line . 4-9 SECTION V. MAINTENANCE . 5-1 5 . 1 . Introduction . 5-1 5.3 . Preventive Maintenance . 5-1 Paragraph Page 5 . 5 . 5.6 . 5.7 . 5.8 . 5.9 . 5-1 0 . 5.11 . 5.14 . 5.17 . 5.19 . 5-2 1 . 5.23 . 5.25 . 5.27 . 5.29 . 5-3 1 . 5.33 . 5.35 . 5.37 . 5.40 . 5.42 . 5.44 . 5.49 . 5-5 1 . 5.54 . 5.56 . 5.58 . 5.62 . 5.65 . 5.67 . 5-69 . 5-7 1 . 5.73 . 5.75 . Electrical Checks . . . . . . . . . . . . . . . . . . 5-1 Mechanical Inspection . . . . . . . . . . . . . . . 5-1 Cleaning . 5-1 Performance Assurance Checks . . . . . . . . . . 5-1 Performance Checks . 5-1 Purpose of Board Isolation Procedures . . . . . 5-2 Purpose of Test and Adjustment Procedures . 5-2 Tools, Supplies. and Test Equipment . . . . . . 5-3- Disassembly and Assembly Procedures . 5-2 Required Equipment . 5-1 Transmitter Disassembly . 5-2 Transmitter Board Replacement . 5-3 Transmitter Reassembly . 5-3 High Frequency Board Removal . 5-3 Low Frequency Board Removal . 5-5 Board Isolation Procedures . 5-5 Board-Level Troubleshooting Extensions . . . 5-11 Compensatory Adjustment References . 5-16 Transmitter Tests and Adjustments . . . . . . . 5-16 Test Equipment Setup . . . . . . . . . . . . . . . 5-18 Subcarrier Frequency . 5-18 Carrier Output . 5-18 Carrier Frequency Deviation . . . . . . . . . . . 5-22 Receiver Tests and Adjustments . . . . . . . 5-22 Test Equipment Setup . . . . . . . . . . . . . . . 5-22 Local Oscillator Tuning . 5-23 AFC Output . 5-23 RF Amplifier Gain and Tuning . 5-25 Inoperative Threshold . . . . . . . . . . . . . . . 5-27 ECG Amplifier Gain and Zero . . . . . . . . . . Crystal Frequency Compensation and IF Gain and Discriminator Alignment . . . . . 5-26 IF Alignment and AFC Loop Zero . . . . . . . 5-26 5-28 System Gain and Noise . . . . . . . . . . . . . . 5-28 Crystal Filter Impedance Match . . . . . . . . . 5-29 SECTION VI. REPLACEABLE PARTS . 6-1 6-1 . Introduction . 6-1 6 4 . Reference Designations . . . . . . . . . . . . . . . . 6-1 6-1 0 . Ordering Information . 6-2 APPENDIX I. BACKDATING INFORMATION . A-1 ) 078 100-2 1 Models 78100A, 78101A Table of Contents Figure 4-1. 4-2. 4-3. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. 5-9. 5-10. 5-1 1. 5-12. 5-13. 5-14. 5-1 5. 5-16. 5-1 7. 5-18. 5-19. Table 5-1. 5-2. 5-3. 5-4. 5-5. 11 Block Diagram, Model 78 Transmitter . . . . . . . . Block Diagram, Model 78 Receiver . . . . . . . . . . . Discriminator Waveforms . LIST OF FIGURES Page OOA Telemetry 01A Telemetry . . . . . . . . . . . . . . 4-4 4-4 . . . . . . . . . . . . . . 4 7 . . . . . . . . . . . . . . Transmitter Case Internal Details . . . . . . . . . . 5-4 Sealing the Transmitter Capsule . . . . . . . . . . . 5-5 Board Isolation Procedure, ECG Signal Quality . . . . . . . . . . . . . . . . . . . . . 5-8 Board Isolation Procdure, Lack of 5-9 Board Isolation Procedure, Inadequate Transmission Range . . . . . . . . . . . . . . . . . 5-9 Board Isolation Procedure, Electrode Light Problem . . . . . . . . . . . . . . . . . . . . . 5-9 Low Frequency Board Test Points and Adjustments . . . . . . . . . . . . . . . . . . 5-10 Low Frequency Board Troubleshooting Waveforms . . . . . . . . . . . . . . . . . . . . . . 5-10 High Frequency Board Test Points and Adjustments . . . . . . . . . . . . . . . . . . 5-13 Receiver Power Supply Troubleshooting . . . . 5-14 Intermediate Frequency Waveforms . . . . . . . 5-16 Transmitter Test Box . . . . . . . . . . . . . . . . 5- 19 Test Setup for Transmitter Tests . . . . . . . . . 5-20 Transmitter Board Test Points and Adjustments . . . . . . . . . . . . . . . . . . 5-21 Adjustment of Transmitter for Maximum Fourth Harmonic . . . . . . . . . . . . . . . . . . 5-22 Test Setup for Receiver Sensitivity . . . . . . . . 5-24 Local Oscillator Spectrum Analyzer Display . . . . . . . . . . . . . . . . . . . . . . . . . 5-24 Peak Intermediate Frequency Display. . . . . . 5-26 Test Setup for Receiver Bandwidth . . . . . . . 5-27 ECG output . . . . . . . . . . . . . . . . . . . . . . Figure Page 5-20. High Frequency Board Filter Impedance Matching. . . . . . . . . . . . . . . . . . . . . . . . 5-29 6-1. 6-2. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-8. 6-9. 6-1 0. 6-1 1. 6-1 2. 6-1 3. Transmitter Model 78 IOOA . . . . . . . . . . . . . 6-3 Transmitter PC Board 78 100-600 10 (A2A l), Parts Location Diagram (Part 1) . . . . . . . . . 6 4 Bottom View of Transmitter Board Showing Transistor Locations (Part 2) . . . . . . . . 6-5/64 Transmitter PC Board 78100-60010/6001 I/ 60012/60013 (A2A1), Schematic Diagram . . . . . . . . . . . . , . . . . . . . . . 6-5/64 Transmitter Accessories . . . . . . . . . . . . . . . . 6-7 Receiver Model 78101A, End Item and Case Assembly . . . . . . . . . . . . . . . . . . . . . 6-7 Low Frequency PC Board 78101-60740 (A2) Parts Location Diagram and Waveforms . . . . 6-8 Low Frequency PC Board 78101-60740, Schematic Diagram . . . . . . . . . . . . . . . . . . 6-9 High Frequency PC Board 78101-60010 (A5) Parts Location Diagram . . . . . . . . . . . . . . 6-10 High Frequency PC Board 78101-60010/ 6001 1 Schematic Diagram and Waveforms . . . . . . . . . . . . . . . . . . . 6-1 1/6-12 PC Board 781 01 -60780 Parts Location Diagram . 6-12a PC Board 78101-60780 Schematic . 6-12b Low Frequency PC Board 78101-60745 (A2) Parts Location Diagram . 6-12c Low Frequency PC Board 781 01 -60745 (A2) Schematic . 6-1 2d A-1 A-2 Low Frequency PC Board 78101-60020 (A2) Low Frequency PC Board 78101-60020, Parts Location Diagram . . . . . . . , . . . . . . A-IO Schematic Diagram . . . . . . . . . . . . . . . . . A-1 1 LIST OF TABLES Page Table Page Tools and Supplies . . . . . . . . . . . . . . . . . . . 5-3 Test Equipment Required . . . . . . . . . . . . . . 5-6 Transmitter Compensatory Adjustments . . . . 5-17 Receiver High Frequency Board Compensatory Adjustments . . . . . . . . . . . 5-1 7 Receiver Low Frequency Board Compensatory Adjustments . . . . . . . . . . . 5-17 5-6. 5-7. 6-1. 6-2. 6-3. Crystal Frequencies and Part Numbers . . . . . 5-30 List of Recommended Spare Parts . . . . . . . . 5-36 Replaceable Parts . . . . . . . . . . . . . . . . . . . 6-13 Replaceable Parts . . . . . . . . . . . . . . . . . . . 6-53 Manufacturers Code List . . . . . . . . . . . . . . 6-95 Revised October 1989 0781 00-2 Models 78100A, 78101A SECTIONS I, II, 111 GENERAL INFORMATION INSTALLATION OPERATION I NT ROD UCT ION This manual contains a description of the principles of operation of the Hewlett-Packard Model 78 100A-78 101 A Telemetry Transmitter and Receiver, instructions for test- ing and troubleshooting these units, and complete electrical schematics, parts lists, and parts location information. A functional description, system specifications, installation, licensing, and operating instructions are provided in Operat- ing Manual 78101-91998, as Sections I, I1 and I11 of the combined manual. Sections I, 11,111 078 100-2 1 Models 78100A, 78101A SECTION IV PRINCIPLES OF OPERATION Section IV Principles of Operation 4-1. INTRODUCTION. 4-2. The telemetry transmitter is carried by a patient. Electrodes on the patient pick up the ECG signal, which the transmitter uses to modulate the signal it sends to the receiver. The receiver translates the radio signal back into an ECG waveform, which appears at rear panel connectors as a 1 mV, 50 mV or 1V output. If the patient goes out of range, if one or more electrodes become detached, or if the battery needs replacement, an automatic signal lights a front panel indicator to show that the channel is in- operative. 4-3. TRANSMITTER. 44. The ECG signal from the patient is routed to the transmitter from the electrodes through shielded cables. A two-stage FM/FM modulation process then creates a modu- lated carrier: After buffering and amplification (Figure 4-l), the ECG signal frequency modulates the audio frequency subcarrier oscillator. The fdtered subcarrier signal, in turn, varies the frequency of a radio-frequency oscillator. The RF oscillator operates at one-fourth of the transmitted frequency. Two frequencydoubling circuits in series quadruple the frequency and apply the broadcast signal to the right-leg (reference) electrode lead, which also serves as an antenna. 4-5. Auxiliary circuits in the transmitter reduce the sub- carrier frequency to about half its normal value if an electrode comes off the patient. This condition can be detected in the receiver. A voltage sensing circuit shuts off the RF oscillator if the battery voltage falls below approximately 6.2 to 6.4 volts. 4-6. ECG Amplifier. 4-7. The input, Q7, consists of two emitter follower buffers (schematic, Figure 6-3). R44, R45, C2, C3, C43, C44 and two feed-through capacitors isolate Q7 from RF energy which may be picked up from the antenna. R8, R9, R10, R12, and R22 shift the voltage level out of the buffers to drive the next stage. 4-8. The voltage gain of the ECG amplifier is supplied by a feedback amplifier consisting of Q8, UlA, and UlB. UlA and U1B are identical transconductance amplifiers. In addition, U1 contains a third transconductance amplifier (UlC) and a pair of PNP transistors used in the regulator (UlD). ,) 1 4-9. ECG Gain Stage. 4-10. Q8 is a differential amplifier with common emitter resistor R46 and collector resistors R47 and R48. The outputs connect to the inputs of UlA. R13 supplies bias current for U1A. UlB is connected as an integrator of the UlA output. The input resistor is R49 and the feedback capacitor is C5. R16 conducts bias current to the amplifier. R15 and R17 bias its non-inverting input. R43 introduces a high frequency roll off. C41 reduces the effect of noise current pulses from the UlB non-inverting input. R14 furnishes feedback around the entire ECG gain stage. C4 and C42 provide frequency.stability. 4-1 1. Slew Rate Limiter. 4-12. The slew rate of the ECG amplifier output is limited since the voltage into the integrator is limited by the power supply. The highest slew rate is determined by the maximum voltage out of U1A divided by R49 times C5. 4-13. Subcarrier Oscillator. 4-14. MULTIVIBRATOR CONTROL CIRCUIT. UlC, Q12, and Q13 are connected as a non-inverting feedback amplifier coupled to the ECG amplifier through C6, which determines the system low-frequency roll off. As far as this amplifier is concerned, Q12 and Q13 are emitter followers connected in parallel. R25 and R26 assure that equal currents will flow in Q12 and Q13. R18 and R19 bias both inputs through other resistors (R20 and R58 in series to the inverting input and R21 to the non-inverting input). R3 supplies bias current to the amplifier, R41 furnishes feedback around the amplifier, and C7 provides frequency stability. As the output voltage of this amplifier varies, the collector currents of Q 12 and Q 13 vary in proportion. The value of these currents is controlled by potentiometer R23 in series with R24. 4- 1 5. VOLTAGE-CONTROLLED MULTIVIBRATOR. The currents produced by Q12 and Q13 are used in the subcarrier oscillator (multivibrator Q14, Ql5, Q16 and Q17) to charge C11 and C8. Only two of the above transistors are on during each quasi-stable state of the multivibrator (first Q14 and Q16, then Q15 and Q17). If Q 15 suddenly turns on, then Q 17 is turned on through R27 and C9. This charges C11 through Q17, R30, and the base of Ql5 and also turns off Q16 through R29 and C10 and turns off Q14 through C8. The voltage on the base of Q14 drops