Racal 9087 Gerador
Fabricante:
Modelo:
9087
Data:
1984
Categoria:
Grupo:
Descrição:
SYNTHESIZED SIGNAL GENERATOR

Informação

2.1 INTRODUCTION 2.1.1 The Racal-Dana signal Generator Model 9087 is designed primarily for the testing of communication equipment over the frequency range from 10 kHz to 1.3 GHz. The RF output is phase-locked to the Frequency Standard, the wide frequency range being obtained by the use of a multi loop Synthesizer. The instrument is microprocessor controlled, and combines versatility with ease-of-control. 2.2 RF TUNING 2.2.1 Tuning may be effected in one of five ways. These are: (a) Numeric keyboard. The required frequency is set directly. (b) Step-up and step-down keys. The displayed frequency is changed in steps. The step size may be one of three preset values, or an operator-set value. (c) Spinwheel. The displayed frequency changes in steps as the spinwheel is rotated. Again, the step size may be one of three preset values or an operator-set value. The use of the spinwheel, particularly with a small step size, affords all the advantages of analog tuning while retaining the stability of a synthesized system. A HOLD control is provided to isolate the spinwheel to prevent accidental changing of the frequency set. (d) GPIB. An internal Interface is fitted. (e) Direct frequency access (DFA). The required frequency may be set by applying suitable control signals directly to the microprocessor data bus to a rear-panel socket. The use of this method permits extremely rapid changes of frequency to be made. A special Interface is required. Full details may be obtained from Racal-Dana Instruments. 2.2.2. The frequency set is displayed on a 10-digit, dot-matrix LED display, affording 1-Hz resolution throughout the frequency range of the instrument. The decimal point is fixed, and leading zeros are suppressed. 2.3 FREQUENCY SWEEP 2.3.1 The 9087 incorporates a frequency-sweep facility which permits the output frequency to be swept, in steps, between two operator-selectable frequencies. The step size can be selected by the operator, and four preset step rates are available. 2.4 RF OUTPUT 2.4.1 Automatic levelling maintains the output level within ±0.4 dB for output frequencies up to 650 MHz, and within ±1.0 dB for output frequencies in the range from 650 MHz to 1.3 GHz, relative to the 50 MHz level. 2.4.2 The output-level range is from +19 dBm to -140 dBm into 50 Ω. The level may be set by means of a numeric keyboard, or the set value may be stepped up or down using either the step keys or the spinwheel. The step size may be one of three preset values, or an operator-set value. 2.5 MODULATION FACILITIES 2.5.1 Amplitude, pulse, frequency, and phase modulation facilities are provided. Two internal-modulating frequencies, locked to the Frequency Standard, are provided, and external-modulating sources may also be used. Details of the permissible range of modulating frequencies, and of the modulation depths and peak deviations which can be obtained, are to be found in Section 1 of this manual. 2.5.2 Amplitude or pulse modulation may be applied simultaneously with frequency or phase modulation. Either or both of the internal-modulating sources, or a combination of internal and external sources may be used. 2.6 FR0NT-PANEL SETTING STORAGE 2.6.1 A non-volatile memory allows the storage of up to 33 (100, if the 100- location memory option is fitted) complete sets of front-panel control settings. These may then be recalled when required. The recalled data may be implemented immediately, or may be displayed for checking before the instrument output is reset. This facility allows the contents of the store to be examined without affecting the output of the instrument. 2.6.2 An exchange facility allows the contents of any two store locations to be exchanged without affecting the output of the instrument. 2.6.3 On switching off, the current front-panel control settings are stored automatically. On switching on again, these settings are immediately implemented. An initialization program is also provided to set the instrument to a known state. 2.7 ERROR INDICATIONS 2.7.1 Certain errors in the operation of the instrument will result in the flashing of a LED-error indicator and the generation of a service request (SRQ) via the GPIB interface. The errors which can be detected are each given a two-digit code, which can be displayed. The nature of the error can then be established by reference to the pull-out information card beneath the instrument or to Section 4 of this manual. 2.8 DIAGNOSTIC CHECKS 2.8.1 Several points in the instrument's circuits are monitored for possible malfunction. The detection of a fault is indicated by the generation of an error indication. A digit in the numeric displays will flash to indicate the location of the fault. 2.8.2 In the event of overheating, the instrument is switched automatically to the standby condition, with only the Frequency Standard and the microprocessor system active. 2.9 SPECIAL FUNCTIONS 2.9.1 A number of special functions are available to the operator. Details are given in Section 4 of this manual. 2.10 OUTPUT PROTECTION 2.10.1 The RF output will withstand the accidental application of reverse-RF power at levels up to 1 W. 2.10.2 Protection against reverse powers of up to 50 W is given by the internally mounted, reverse-power-protection-unit option. This isolates the RF output socket, and sounds an audible alarm, when reverse powers are applied above the threshold level. The device latches in the tripped state. 2.11 GPIB Interface 2.11.1 An internally mounted Interface to the IEEE-488-GPIB is provided. This enables all the instrument functions, except the line power switching and Frequency Standard changeover, to be remotely controlled. An adapter to provide compatibility with the IEC 625-1 bus is available as an optional accessory. 2.11.2 Control via the GPIB may be exercised in one of three ways. These are: (a) Immediate Mode Control, in which each data byte accepted by the 9087 from the bus is processed before the next byte is accepted. This provides the shortest delay in completing the resetting of the 9087's output following a data entry made on a controller keyboard. (b) Deferred Mode Control, in which the complete data string is accepted from the bus and stored before processing is commenced. The use of the bus is therefore limited to the data transfer time, and better utilization of the bus is possible at the cost of a small increase in the total time taken to vary the 9087's output parameters. (c) Learn Mode Control, in which data strings related to particular settings of the 9087's output are generated in the 9087 and stored in an external memory. When a data string is fed back to the 9087 as an addressed command, the output parameters will be set to the related values. This provides a significant saving in time when compared with keyboard control, and, by feeding back a succession of data strings, the 9087 may be stepped rapidly through a number of different output-parameter patterns. Two lengths of data string are available, the longer controlling the full range of output parameters and the other controlling frequency only. The longer data string may also be used to monitor the instrument's settings. This may be found useful when the 9087 is used in operator-interactive systems.

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Serviço e Manual do Usuário
Tipo de manual:
Serviço e Manual do Usuário
Páginas:
342
Tamanho:
48.48 Mbytes (50833475 Bytes)
Idioma:
english
Revisão:
ID de manual:
ΤΗ 3635
Data:
Qualidade:
Scaned documento, todas legível.
Data de upload:
2015 10 25
MD5:
1bad6f668011d34df91719a3ff0b6543
Downloads:
1218

Informação

1 TECHNICAL SPECIFICATION ... 1-1 2 GENERAL DESCRIPTION ... 2-1 2.1 Introduction ... 2-1 2.2 RF Tuning ... 2-1 2.3 Frequency Sweep ... 2-1 2.4 RF Output ... 2-1 2.5 Modulation Facilities ... 2-2 2.6 Front Panel Setting Storage ... 2-2 2.7 Error Indications ... 2-2 2.8 Diagnostic Checks ... 2-2 2.9 Special Functions ... 2-3 2.10 Output Protection ... 2-3 2.11 GPIB Interface ... 2-3 2.12 External Step Switches ... 2-4 2.13 Maintenance ... 2-4 3 PREPARATION FOR USE ... 3-1 3.1 Packaging ... 3-1 3.2 Power supply ... 3-1 3.2.1 AC Voltage Range Setting ... 3-1 3.2.2 Line Fuse ... 3-1 3.2.3 DC Fuses ... 3-2 3.2.4 Power Cord ... 3-2 3.3 Frequency Standard ... 3-2 3.4 External Step Switches ... 3-2 3.5 Battery Charging ... 3-3 3.6 Operator's Checks ... 3-11 4 OPERATING INSTRUCTIONS ... 4-1 4.1 Introduction ... 4-1 4.2 Description of Controls, Indicators and Connectors 4-1 4.2.2 Front Panel Items ... 4-1 4.2.3 Rear Panel Items ... 4-5 4.3 Switching On ... 4-9 4.4 Simplified Operating Procedure ... 4-9 4.5 Operating Instructions ... 4-9 4.5.2 Frequency ... 4-11 4.5.3 Frequency, Relative ... 4-13 4.5.4 Frequency, Sweep ... 4-15 4.5.5 Amplitude ... 4-17 4.5.6 Amplitude, Relative ... 4-19 4.5.7 Modulation, Amplitude ... 4-22 4.5.8 Modulation, Pulse ... 4-25 4.5.9 Modulation, Frequency ... 4-27 4.5.10 Modulation, Phase ... 4-30 4.5.11 Modulation, Mixed ... 4-33 4.5.12 Modulation, External Source ... 4-34 4.5.13 Increment ... 4-35 4.5.14 Step Size, Operator-Set ... 4-39 4.5.15 Initialisation ... 4-41 4.5.16 Memory, Store ... 4-42 4.5.17 Memory, Recall (Normal) ... 4-44 4.5.18 Memory, Recall (Immediate) ... 4-46 4.5.19 Memory, Exchange ... 4-50 4.5.21 Special Functions ... 4-54 4.5.23 Reverse Power Protection Unit ... 4-57 5 OPERATION VIA THE GPIB ... 5-1 5.1 Preparation For Use With the GPIB ... 5-1 5.1.1 Introduction ... 5-1 5.1.2 Connections to the GPIB ... 5-1 5.1.3 Address Setting ... 5-1 5.2 Data Acceptance Modes ... 5-3 5.3 Display Updating ... 5-4 5.4 Data Output ... 5-4 5.5 The Instrument Status Data String ... 5-5 5.6 The Learn Mode ... 5-6 5.6.1 Introduction ... 5-6 5.6.2 Obtaining a Data String Output ... 5-7 5.7 Monitoring the Control Settings ... 5-8 5.8 SRQ and Status Byte Outputs ... 5-12 5.8.1 Status Byte Format ... 5-12 5.8.2 Status Byte Mask Register ... 5-12 5.8.3 Setting the Mask Register ... 5-12 5.8.4 Reading the Mask Register ... 5-13 5.9 Remote/Local Changeover ... 5-13 5.9.1 Local to Remote Changeover ... 5-13 5.9.2 Remote to Local Changeover ... 5-13 5.9.3 Local Lockout (LLO) ... 5-13 5.10 Logic Levels ... 5-14 5.11 GPIB Command ... 5-14 5.11.2 Immediate and Deferred Data Acceptance Modes 5-14 5.11.3 The Fast Learn Mode ... 5-16 5.11.4 The Long Learn Mode ... 5-17 5.12 Operating Instructions for Remote Control ... 5-17 5.12.1 Operating Modes ... 5-17 5.12.2 Command Codes for Remote Control ... 5-17 6 PRINCIPLES OF OPERATION ... 6-1 6.1 Introduction ... 6-1 6.2 Physical Contruction ... 6-1 6.3 Servicing the Sealed Modules ... 6-1 6.4 Principles of Operation ... 6-1 6.4.1 Functional Systems ... 6-1 6.4.2 The RF Generating System ... 6-1 6.4.3 The Control, Memory and Display System ... 6-2 6.4.4 The Power supply System ... 6-6 6.5.1 The RF Generating System ... 6-6 6.5.2 The Audio System Assembly ... 6-6 6.5.2.1 Introduction ... 6-6 6.5.2.2 The FM/0M Channel ... 6-6 6.5.2.3 The AM/Pulse Moduation Channel ... 6-12 6.5.2.4 The Control Channel ... 6-15 6.5.3 The Control, Memory and Display System ... 6-16 6.5.4 The Processor Assembly ... 6-16 6.5.4.1 Introduction ... 6-16 6.5.4.2 The Bus Structure ... 6-16 6.5.4.3 Control Line Decoding ... 6-17 6.5.4.4 The System Clocks ... 6-18 6.5.4.5 Addressing the Program ROM ... 6-21 6.5.4.6 The Random Access Memory ... 6-22 6.5.4.7 Interrupt Operation ... 6-22 6.5.4.8 Keyboard Operation ... 6-23 6.5.4.9 Spinwheel Operation ... 6-23 6.5.4.10 Reset Circuit ... 6-24 6.5.4.11 Test Switch ... 6-24 6.5.5 The Non-Volatile Memory Assembly ... 6-24 6.5.5.1 Introduction ... 6-24 6.5.5.2 Memory Addressing ... 6-25 6.5.5.3 Read/Write Control ... 6-25 6.5.5.4 Memory Supply Changeover ... 6-25 6.5.5.4 The Battery Charging System ... 6-25 6.5.6 The Display System ... 6-26 6.5.6.1 Introduction ... 6-26 6.5.6.2 Display Element Addressing ... 6-26 6.5.6.3 LED Flashing Circuit ... 6-26 6.5.6.4 Display Check and Inhibit ... 6-27 6.5.6.5 Spinwheel Pulse Generator ... 6-28 6.5.7.1 Introduction ... 6-28 6.5.7.2 Control Line Decoding ... 6-28 6.5.7.3 LF Control Line Setting ... 6-29 6.5.7.5 RPPU Operation ... 6-30 6.5.7.6 Output Amplifier Bandwidth Control ... 6-30 6.5.7.7 Clunker Drive ... 6-30 6.5.7.8 Auxiliary Input Operation ... 6-30 6.5.7.9 Alarm Test ... 6-31 5.5.8 The GPIB Interface ... 6-31 6.5.8.1 Introduction ... 6-31 6.5.8.2 Address Setting and Recognition ... 6-31 6.5.8.3 Operation as a Listener ... 6-31 6.5.8.4 Operation as a Talker ... 6-32 6.5.8.5 Detection of the Serial Poll Disable Message 6-33 6.5.8.6 Untalk, Unlisten and IFC Interrupt ... 6-33 6.5.8.7 ATN Interrupt ... 6-33 6.5.9 The Audio System Assembly ... 6-33 6.5.10 The FM System Assembly ... 6-33 6.5.11 The Output System Assembly ... 6-33 6.5.12 The Comb Loop Assembly ... 6-34 6.5.12.1 Introduction ... 6-34 6.5.12.2 Decoder and Data Latches ... 6-34 6.5.12.3 Directly Controlled Lines ... 6-34 6.5.12.4 Control Line 0CB2 ... 6-34 6.5.12.5 Control Lines OCB0 and 0CB1 ... 6-34 6.5.12.6 ROM Controlled Lines ... 6-35 6.5.13 The Power supply System ... 6-35 6.5.13.1 Introduction ... 6-35 6.5.13.2 The +5 V (A) Supply ... 6-35 6.5.13.3 The +18 V Supply ... 6-36 6.5.13.4 The Overtemperature Interrupt ... 6-37 6.5.13.5 PWRDN Interrupt ... 7-1 7.1 Introduction ... ... 7-1 7.3 Automatic Indications of Fault Conditions ... 7-1 7.3.1 Introduction ... 7-1 7.3.2 The Processor RAM Check ... 7-4 7.3.3 The Program ROM Check ... 7-4 7.3.4 Stuck Key Check ... 7-5 7.3.5 Non-Volatile Memory Check ... 7-5 7.3.6 Out of Lock Errors ... 7-5 7.3.7 Power supply Failures ... 7-7 7.4 Special Functions for Fault Diagnosis ... 7-7 7.4.1 Introduction ... 7-7 7.4.2 Special Functions 11, 12 and 13 ... 7-8 7.4.3 Special Functions 24, 25 and 26 ... 7-9 7.4.4 Special Function 27 ... 7-10 7.4.5 Special Functions 30, 32 and 33 ... 7-10 7.4.6 Special Function 34 ... 7-11 7.4.7 Special Function 35 ... 7-11 7.4.8 Special Function 36 ... 7-11 7.4.9 Special Function 37 ... 7-11 7.4.10 Special Function 52 ... 7-12 7.4.11 Special Function 75 ... 7-13 7.4.12 Special Function 90 ... 7-13 7.4.13 Special Function 91 and 92 ... 7-13 7.4.14 Special Function 98 ... 7-13 7.5 Signature Analysis ... 7-14 7.5.1 Test Equipment ... 7-14 7.5.2 Preparation for Signature Analysis ... 7-14 7.5.3 Connecting the Signature Analyzer ... 7-14 7.5.4 Analysis Procedure ... 7-15 7.6 Fault Location ... 7-21 7.7 Setting Up After Repair ... 7-21 7.7.1 Introduction ... 7-21 7.7.2 Display Assembly 19-1041 ... 7-21 7.7.3 Non-Volatile Memory Assembly 19-1049 ... 7-21 7.7.3.2 Preparation for Testing ... 7-21 7.7.3.3 VALID POWER Signal Test ... 7-22 7.7.3.4 Battery Voltage Threshold Setting ... 7-22 7.7.3.5 Battery Charging Time Test ... 7-22 7.7.3.6 Option Check ... 7-35 7.7.3.7 Memory Corruption Check ... 7-35 7.7.4 Processor Assembly 19-1051 ... 7-35 7.7.4.2 Preparation for Testing ... 7-35 7.7.4.3 Clock Timing Adjustment ... 7-35 7.7.4.4 NMI Test ... 7-36 7.7.4.5 Spinwheel Counter Test ... 7-36 7.7.4.6 Standby Test ... 7-37 7.7.5 Motherboard Assembly 19-1043 ... 7-37 7.7.5.2 Preparation for Testing ... 7-37 7.7.5.3 Out-of-Lock Lines Test ... 7-37 7.7.5.4 Spinwheel Test ... 7-37 7.7.5.5 Keyboard Test ... 7-37 7.7.5.6 Setting the Monostable Timing ... 7-38 7.7.5.7 Attenuator Drive Test ... 7-38 7.7.5.8 Output Amplifier Control Test ... 7-38 7.7.5.9 RPPU Circuit Test ... 7-38 7.7.5.10 LF Synthesizer Drive ... 7-39 7.7.5.11 Standby Test ... 7-39 7.7.5.12 GPIB and Memory Board Test ... 7-39 7.7.6 FM Module 11-1535 ... 7-41 7.7.7 Audio system Assembly 19-1048 ... 7-41 7.7.7.2 Preparation for Testing ... 7-41 7.7.7.3 FM/0M Channel ... 7-41 7.7.7.4 AM/Pulse Channel ... 7-43 7.8 Dismantling and Reassembly ... 7-45 7.8.1 Introduction ... 7-45 7.8.1.1 Semi-Rigid Coaxial Connectors ... 7-45 7.8.1.2 Ribbon Cable Connectors ... 7-46 7.8.1.3 Assembly Location ... 7-46 7.8.2 Removing the Covers ... 7-46 7.8.3 Assemblies 19-1049, 19-1050 and 19-1051 ... 7-46 7.8.4 Removing the Module Block ... 7-47 7.8.5 Dismantling the Module Block ... 7-47 7.8.5.1 Introduction ... 7-47 7.8.5.2 Audio System Assembly 19-1048 ... 7-48 7.8.5.3 Output System Module 11-1532 ... 7-48 7.8.5.4 Comb Loop Module 11-1702 ... 7-48 7.8.5.5 Reference Generator and LF Synthesizer Module 11-1534 ... 7-48 7.8.6 Power supply Control Assembly 19-1059 ... 7-49 7.8.8 GPIB Connector Assembly 19-1053 ... 7-49 7.8.9 Rear Panel Assembly ... 7-50 7.8.10 Power supply Chassis Assembly ... 7-50 7.8.11 Frequency Standard and Assembly 19-1167 ... 7-51 7.8.12 Attenuator Assembly 11-1526 ... 7-51 7.8.13 Front Panel Assembly ... 7-51 7.8.14 Display Assembly 19-1041 ... 7-52 7.8.15 Motherboard Assembly 19-1043 ... 7-52 7.9 Overall Specification Check ... 7-53 7.9.1 Introduction ... 7-53 7.9.2 Preferred PVPs ... 7-53 7.9.2.1 Frequency PVP ... 7-54 7.9.2.3 Attenuator PVP ... 7-55 7.9.2.4 Audio Output PVP ... 7-56 7.9.2.5 Modulation PVPs ... 7-58 7.9.2.6 SSB Phase Noise PVP (Optional) ... 7-61 7.9.2.7 Broadband Noise Floor PVP (Optional) ... 7-62 7.9.2.8 Spectral Purity PVP ... 7-62 7.9.2.9 Internal Frequency Standard PVP ... 7-64 7.9.2.10 External Standard Input PVP ... 7-65 7.9.3 Alternative PVPs ... 7-65 7.9.3.2 Attenuator PVP ... 7-66 7.9.3.3 Audio Output PVP ... 7-66 7.9.3.4 Internal Frequency Modulation PVP ... 7-68 7.9.3.5 Broadband Noise Floor PVP (Optional) ... 7-69 8 PARTS LIST, COMPONENT LAYOUTS AND CIRCUIT DIAGRAMS Parts List: Chassis Assembly 11-1520 ... Parts List 3 Parts List: Display Assembly 19-1041 ... Parts List 5 Parts List: Motherboard Assembly 19-1043 ... Parts List 11 Parts List: Audio System Assembly 19-1048 ... Parts List 17 Parts List: Non-Volatile Memory Assembly 19-1049 Parts List 29 Parts List: GPIB Assembly 19-1050 ... Parts List 33 Parts List: Parts List: Parts List: Parts List: Parts List: Parts List: Parts List: Parts List: Parts List: Parts List: Processor Assembly 19-1051 ... GPIB Connector Assembly 19-1053 Power supply System ... Oscillator Supply Filter Assembly 19-1167 ... Output System Module 11-1532 ... Comb Loop Module 11-1702 ... FM System Module 11-1535 ... Reference Generator and LF Synthesizer Module 11-1534 ... Module Block Assembly ... Chassis Layout ... Module Block ... Display Assembly 19-1041: Interconnections ... Austron Oscillator Option 19-1158: Layout and Component Layout Circuit Diagram ... Motherboard Assembly 19-1043: Component Layout Circuit Diagram ... Audio System Assembly 19-1048: Component Layout Circuit Diagram ... Non-Volatile Memory Assembly 19-1049: Component Layout Circuit Diagram ... GPIB Assembly 19-1050: Component Layout Circuit Diagram ... Processor Assembly 19-1051: Component Layout Circuit Diagram ... GPIB Connector Assembly 19-1053: Component Layout Circuit Diagram ... Power supply Chassis: Component Layout Power supply Interconnect Assembly: Component Layout Power supply Control Assembly: Component Layout Power Supply: 'Circuit Diagram ... Oscillator Supply Filter Assembly 19-1167: Layout and Circuit Diagram Output System Module 11-1532: Component Layout Circuit Diagram . Comb Loop Module 11-1702: Component Layout Circuit Diagram . FM System Module 11-1535: Component Layout Circuit Diagram . Reference Generator and LF Synthesizer Module 11-1534 Component Layout Circuit Diagram .. Circuit Diagram Page Parts Li St 35 Parts Li St 39 Parts Li St 41 Parts Li St 49 Parts Li St 51 Parts Li St 53 Parts Li St 57 Parts Li St 59 Parts L St 63 Parts Li St 65 Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 22 Fig. 23 Fig. 24 Fig. 25 Fig. 26 Fig. 27 Fig. 28 Fig. 29 Fig. 30 3.1 Check Frequencies ... 3-4 3.2 Check Frequencies ... 3-4 5.1 GPIB Connector Pin Assignment ... 5-1 5.2 Address Switch Setting ... 5-2 5.3 Special Function Number Bit Allocation ... 5-5 5.4 Special Function Number Bit Code ... 5-8 5.6 Numerical Data Format ... 5-9 5.7 Modulation Data ... 5-9 5.8 AM Control Data ... 5-10 5.9 FM Control Data ... 5-10 5.10 0M Control Data ... ... ... 5-11 5.12 Incremental Control Data ... 5-11 5.13 REL and Sign Data ... 5-11 5.14 Status Byte ... 5-12 5.15 Character Acceptance Times ... 5-14 5.16 Processing Times ... 5-15 5.17 Processing Plus Data Acceptance Times ... 5-15 5.18 Bus Busy Times ... 5-16 5.19 Frequency Commands ... 5-18 5.20 Amplitude Commands ... 5-18 5.21 Modulation Commands ... 5-19 5.22 Memory Commands ... 5-20 5.23 Data Acceptance Mode Codes ... 5-20 5.24 Data Output Mode Codes ... 5-21 5.25 Status Byte Mask Setting Code ... 5-21 5.26 Increment System Commands ... 5-22 5.27 Miscellaneous Codes ... 5-22 5.28 Alphabetic List of Function Codes ... 5-23 5.29 Alphabetic List of Units Codes ... 6-13 6.4 Modulation Enablement and Disablement, AM and Pulse Modulation ... 6-14 6.5 AUA Control Line Logic Levels ... 6-15 6.6 System Control Lines ... 6-17 6.7 Processor Assembly Local Control Lines ... 6-18 6.8 Motherboard Assembly Local Control Lines ... 6-29 6.9 Power supply Rail Details ... 6-35 7.1 Test Equipment Required ... 7-1 7.2 Fault Indications ... 7-4 7.3 Order of ROM Check ... 7-5 7.4 Key Codes ... 7-6 7.5 Out-of-Lock Indications ... 7-6 7.6 Power supply Failure Indications ... 7-7 7.7 Special functions for Fault Diagnosis ... 7-8 7.8 RF System Measurement Points ... 7-9 7.9 Signature Analysis, Assembly 19-1051 ... 7-15 7.10 Signature Analysis, Module 11-1535 ... 7-16 7.11 Signature Analysis, Assembly 19-1043 ... 7-17 7.12 Signature Analysis, Assembly 19-1041 ... 7-18 7.13 Signature Analysis, Assembly 19-1048 ... ... 7-19 7.15 Signature Analysis, Module 11-1532 ... 7-19 7.16 Signature Analysis, Assembly 19-1049 ... 7-20 7.17 Keyboard Check ... 7-38 7.18 GPIB and Memory Board Test ... 7-40 7.19 Frequency Verification ... 7-71 7.20 Output Level Accuracy Measurements ... 7-72 7.21 Attenuator Verification ... 7-74 7.22 Audio Frequency Measurement ... 7-74 7.23 Audio Output Level and Distortion ... 7-75 7.25 High/Low Detector Check ... 7-76 7.28 Phase Modulation at 10 kHz External Modulation 7-76 7.29 Amplitude Modulation at 80% with 1 kHz INT Modulation ... 7-76 7.30 Amplitude Modulation at 30% with 1 kHz INT Modulation ... 7-77 7.31 External Amplitude Modulation at 80% ... 7-77 7.32 Preliminary Pulse Modulation Verification ... 7-77 7.33 Pulse Modulation Measurement ... 7-78 7.34 Spurious Signal measurement ... 7-78 7.35 Line-Related Spurious Signal Measurement ... 7-78 7.36 Harmonic Frequency Measurement ... 7-79 7.37 External Standard Input Signal Locking ... 7-79 7.38 Attenuator Verification ... 7-80 7.39 Frequency Measurement for Audio Output Verification 7-80 7.40 Audio Output Level ... 7-80 7.41 Audio Output Distortion ... 7-81

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