Name: HP 8656A
Brand: HP
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Contents4
General Information12
Specifications12
Safety Considerations12
Instruments Covered12
Description13
Carrier Frequency13
Output Amplitude13
Modulation Capabilities13
Hewlett-Packard Interface Bus14
Electrical Options14
Mechanical Options14
Compability14
Supplemental Characteristics18
Frequency18
Output18
Spectral Purity18
Recommended Test Equipment19
Installation22
Initial Inspection22
Preparation for Use22
Power Requirements22
Power Cables23
Time Base Selection23
Line Voltage and Fuse Selection23
Line Fuse Ratings and Part Numbers23
HP-IB Address Selection24
Power Cable and Mains Plug Part Numbers24
Mating Connectors25
Operating Environment25
Bench Operation25
Rack Mounting25
Time Base Jumper Location26
HP-IB Address Switch Location and Settings26
Interface Bus Connections27
Storage and Shipment28
Environment28
Packaging28
Operation29
Operating Characteristics29
Local Operation29
Remote Operation29
General Operating Instructions30
Operator's Maintenance30
Power-On Procedure30
Power-On Sequence31
Keystroke Sequences31
Initialized Conditions31
Carrier Keystroke Sequence32
Store-Recall-Display-Sequence33
Setting Carrier Functions34
Setting Modulation Functions34
Changing Parameters Values34
Simplified Front Panel Features35
Index of Detailed Operating Instructions37
Detailed Panel Features38
Display and Remote Features39
Carrier Features41
Carrier Keys41
RF Output Connector41
Modulation Features42
Modulation Keys42
Source Keys42
MOD Input/Output Connector42
Data Entry Keys43
Units Entry Keys43
Store-Recall-Display-Sequence Keys44
INCR SET Key44
RESET/STBY/ON Switch45
Rear Panel Features46
Operator's Checks47
Basic Functional Checks47
Frequently Check48
Output Level Checks49
FM Check50
FM Function Check Waveform50
HP-IB Functional Checks51
AM Check51
Address Recognition52
Remote and Local Messages and the LOCAL Key53
Data Message53
Local Lockout and Clear Lockout/Set Local Message54
Clear Message55
Abort Message55
HP-IB Compability57
HP-IB Message Reference Table58
Addressing59
Data Messages59
Receiving the Data Message59
Valid Decimal Values Vs. Equivalent ASCII Characters59
Keyboard-To-Program Code Correlation60
Value-Selectable Parameters60
Data Message Examples60
Sending the Data Message61
Receiving the Trigger Message61
Receiving the Clear Message61
Receiving the Remote Message61
Receiving the Clear Lockout/Set Local Message62
Receiving the Pass Control Message62
Receiving the Abort Message62
Switching Characteristics62
Frequency Switching63
HP-IB Program Codes63
Commonly Used Code Conversions64
Amplitude Switching65
Modulation Switching65
Frequency Switching Characteristics65
Amplitude66
Amplitude Conversion68
Amplitude, Up/Down70
Display71
Display Sequence72
Frequency, Coarse and Fine Tune75
Frequency, Up/Down77
HP-IB Address Display78
Increment Value Change80
Increment Value Display82
Modulation, am83
Modulation, am Up/Down84
Modulation, External Source85
Modulation, FM86
Modulation, FM Up/Down88
Modulation, Mixed89
Modulation, off93
Recall95
Sequence96
Store97
Performance Tests98
Equipment Required98
Performance Test Record98
Calibration Cycle98
Spectral Purity Tests100
High Level Accuracy and Flatness Tests105
Low Level Accuracy Tests108
Modulation Tests110
Adjustments124
Factory-Selected Components124
Post-Repair Adjustment125
Related Adjustments125
Power Supply Voltage Adjustment126
Reference Voltage Adjustment127
Audio Oscillator Level Adjustment128
AM Offset Adjustment129
715 Mhz Sideband Adjustment130
Notch Filter Adjustments131
High Frequency Loop Offset Adjustment134
50 Mhz Reference Oscillator Frequency Adjustment136
50Mhz Reference Oscillator Level Adjustment137
60 To 110 Mhz Oscillator Flatness Adjustment138
690 To 740 Mhz if Compensation Adjustment139
400 Mhz Bandpass Filter Adjustment140
Level and ALC Loop Detector Adjustments141
Heterodyne Band Accuracy and Flatness Adjustments143
AM% and ALC Loop am Adjustments145
FM Deviation Adjustment147
FM Frequency Response Adjustment148
Attenuator Adjustments149
Option 001 10 Mhz Reference Oscillator Frequency Adjustment152
Replaceable Parts153
Abbreviations153
Factory Selected Parts153
Parts List Backdating153
Recommended Spares List154
Reference Designations155
Cabinet, Parts Identification187
Front Panel, Parts Identification188
Rear Panel, Parts Identification189
Top Internal View, Top Cover Removed190
Top Internal View, A3 Assembly in Service Position191
Bottom Internal View, A10/A11 Assemblies in Service Position192
Bottom Internal View, Bottom Cover Removed193
Low Frequency Loop Assembly - A3, Parts Identification194
Attenuator Assembly - A9, Parts Identification195
Manual Changes196
Manual Change Instructions198
Address Buffering/Decoding, Serial I/O and Control Schematic Diagram200
Instrument Modifications205
Improving Power Supply Reliability205
Decreasing Spurios Signal Output205
Improving Low Level Accuracy205
Improving RF Frequency206
Loss of Signal Generator Control by the Keyboard206
Service207
Recommended Test Equipment and Accessories208
Service Tools, Aids and Information208
Troubleshooting209
Assembly Locations209
Parts and Cable Locations209
Test Points and Adjustment Locations209
Strategy210
Circuit Troubleshooting210
Signature Analysis210
Repairs211
Assembly Access Information212
A3 Assembly Service Position212
Level 2 Access212
Rear Panel and Fan Shroud Removal213
A10/A11 Assemblies Service Position213
Level 3 Access213
Replacement of Key Cap and Pushbutton Switches214
Fan Shroud Removal214
Key Cap Replacement214
Switch Replacement214
Pushbutton Switch Support Anvi215
Heat Staking Tip215
Typical Assembly for Heat Staking Operation215
Manual Backdating216
Manual Updating216
Etched Circuits216
Schematic Symbology and Operating Principles216
Etched Circuit Soldering Equipment217
Gates and Qualifiers217
Indicator Symbols217
Contiguous Blocks217
Basic Logic Symbols and Qualifiers218
Active Levels219
Edge Sensitive Inputs219
Delayed Output Response219
Inhibit Inputs219
AND Dependency Notation220
Address Dependency Notation221
OR and Free Dependency Notation221
Common Control Block221
Complex Device Symbology222
Shift Register222
Up/Down Counter222
Quad D-Type Latch222
Complex Logic Symbology and Operating Principles223
Microprocessor223
Random Access Memory223
Read Only Memory223
Multiple Bus Transceivers224
General Purpose Interface Adapter224
Successive Approximation Register (SAR)225
Digital-To-Analog Converter225
Programmable Interval Timer226
BCD-To-Seven-Segment Latch/Decoder/Divider226
Linear Device Operating Principles227
Operational Amplifiers227
Comparators228
Schematic Diagram Notes229
Low Frequency and FM Section237
Microprocessor, Keyboard, and Display Section237
Line Check238
Power-Up Check238
Frequency and Amplitude239
Modulation239
High Frequency and Output Section243
Frequency Multiplier Assembly243
High Frequency Loop Assembly243
High Frequency Oscillator Assembly244
Output Assembly244
Attenuator Assembly245
Audio/Power Supply Assembly245
RF Output and Attenuator Check246
Output Assembly Check246
Frequency Multiplier247
Audio/Power Supply247
Low Frequency Loop Assembly252
50 Mhz Reference Oscillator Checks254
Divider Circuit Checks254
VCO Tune Voltage and FM Checks255
Frequency Modulation Checks255
Keyboard Assembly259
Microprocessor, Memory and HP-IB Assembly259
Display Assembly260
Power-On or Reset Sequence260
Keyboard and HP-IB Checks261
A4 High Frequency Loop Assembly266
Voltage Controlled Oscillator266
Buffer Amplifier266
Power Splitter267
IF Buffer Amplifier268
Sampling Bridge and Pulse Generator268
Loop and if Sideband Frequencies269
RF Output Versus HF Loop Output269
Voltage Tuned Oscillator Check270
IF Input Filter271
Notch Filters271
Pulse Generator, Sampling Bridge271
P/O A4 High Frequency Loop Assembly280
Sideband Comparators281
Gain Compensation282
HF Loop Data Storage/Drivers282
Exclusive-Or Gate A4U6282
Search Amplifier, Loop Amplifier, Sideband Comparator/Sideband Switch283
High Frequency Loop Signatures285
A8 Frequency Multiplier Assembly290
Multiplier Stages Bias Voltages291
RF Levels291
RF Diviers300
ALC Loop301
Detector Bias301
ALC Amplifier301
Output Amplifier302
PIN Modulator303
Voltage-Tuned Filters303
ALC Amplifier Voltage Levels305
Band Select Shift Register Signatures313
Voltage Tuned Filter TUNE Voltages314
Waveforms with HF Loop Unlocked314
External Modulation325
P/O Modulation Control Latches, Level DAC325
P/O Modulation Control Latches, AM% DAC325
Internal FM Select326
Internal Modulation326
External am Select326
External FM Select326
RF Amplitude Ranges327
Amplitude Control328
Modulation Control328
Function Control Voltage Levels329
Attenuator Control342
Attenuator Control Component Locations343
Reverse Power Protection Component Locations344
Attenuator, Attenuator Control/Reverse Power Protection Block Diagrams345
Linear Amplifier352
110 Mhz Low-Pass Filter352
Phase-To-Charge Converter, Charge-To-Voltage Converter376
Slew Rate Control377
Summary377
Tune Sample Control378
Phase Detector Reset Control378
Low Slew Rate Mode388
Data Entry During FM Calibration388
Low Offset Comparator Circuits388
U11B Pre-Cal Setting Monostable Operation389
U11A Start Conversion Monostable Operation389
U5A Operation389
High Slew Rate Mode390
U28B Operation390
U21B High Slew Rate Monostable Operation390
FM Calibration Simplified Block Diagram391
SAR Clock Generator, Successive Approximation Register392
Low Offset Comparator Control, Low Offset Comparator393
FM Cal DAC, Current-To-Voltage Converter393
LF Loop FM System Calibrator Component Locations394
LF Loop FM System Calibrator Block Diagrams395
FM Integrator Bias Loop399
FM Calibration, FM Integrator Sample and Hold Buffer400
FM Deviation Amplifier401
FM Deviation Circuits404
LF Loop FM System Control Component Locations405
Crystal Phase Lock Circuit414
Crystal Phase Lock Circuit Voltages414
Divided Time Base Signals414
50 Mhz Reference Oscillator416
Time Base Divider416
Reference Oscillator and Phase Lock Loop Block Diagrams417
Restart Circuitry423
Maskable Interrupt Request424
Data Bus Buffering424
System Clock425
RAM Enable425
Standby425
Halt425
Microprocessor/Memory/Hp-IB Assembly426
Data Bus426
Read/Write Control426
Address Bus426
Data Bus Verification427
Microprocessor Data Bus Signatures428
A7 Assembly Interrupt Input Component Locations428
Microprocessor, Interrupt Processing and Restart Component Locations429

Brand	HP
Model	8656A
Category	Inverter
Language	English

HP 8656A Service Manual

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