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Agilent Technologies 2948, 2712A manual Rev.15DEC89 Troubleshooting General

Models: 2712A 2948

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Model 8904A

Service

TROUBLESHOOTING

GENERAL

The goal of the following troubleshooting procedures is to isolate the fault to a single, replaceable assembly. The instrument assemblies are as follows:

0A1 Keyboard

0A2 Digital

0A3 Output

0A4 Power Supply

0A5 Display

0A6 High Power Output (Installed only in Option 006)

0A10 Output (Installed only in Option 002)

The exploded drawings at the end of section 6 in the manual will assist in locating, disassembling, and reassembling these assemblies.

The troubleshooting procedures assume the failure is catastrophic. For subtle or slightly-out-of- specification failures, it is best to begin diagnosis by running the performance tests and adjustments.

To isolate the fault to a printed circuit board assembly,it is usually necessary to check only the signals on the interface (interconnections) between assemblies. Specifically, this will be the interface between the A2 Digital Assembly and one of the other assemblies. The A3 (or A10) Output Assembly can be troubleshot to the component level using the troubleshooting information on the schematic diagrams.

NOTE

If the A 2 Digital Assembly is replaced, it will be necessary to restore the instrument’s serial number and, where applicable, Option 001 andfor 003 in non-volitile memory. Theprocedures to do this follow the last troubleshooting procedure.

The the troubleshooting procedures verify the signals in the:

0A2 Digital Assembly to A3 (or A10) Output Assembly Interface

0A2 Digital Assembly to A1 Keyboard Assembly Interface

0A2 Digital Assembly to A5 Display Assembly Interface

0A3 or A10 Output Assembly

0A6 High Power Output

Other procedures include:

How to Restore the Serial Number in a Replacement A2 Digital Assembly

0How to Restore Options 001 and 003 in a Replacement A2 Digital Assembly

0How to Replace the Memory Backup Battery

NOTE

If the instrument has Option 002, a second output, and the fault appears only on one output, swap the A3 and A10 assemblies and see if the fault tracks the output assembly. If it does, then the Output Assembly is at fault; otherwise, the A2 Digital Assembly (or possibly an interconnection) is at fault.

rev.15DEC89

Troubleshooting (General)

8-29

Image 97

Agilent Technologies 2948, 2712A manual Rev.15DEC89 Troubleshooting General

Contents

Innovating the HPWay Agilent TechnologiesCopyright@ HEWLETT-PACKARD Company Multifunction SynthesizerRegulatory Information Safety Considerations Safety Considerationsfor this Instrument Product Markings Contents Reu.200CT88 Service cont’d SectionIntroductionto this Section Replaceable Parts ListReference Designationsand Abbreviations Used in this Manual How to Order Replaceable Parts List Updating Manual UpdatesNable 6-1.Reference Designations AccessAbbreviations 1 ALCAbbreviations 2 Rev.01JUL91 Replaceable PartsDescription Number CodeHPPart Description Number Mfr- Mfr. Part Number Code Fible 6-3.Replaceable PartsCAPACITOR-FXD22PF +-5% Poovdc CER 0+-30 Not Assigned Designation Number Reference HP Part DescriptionMfr Reference HP Part Description Designation NumberRev.1 7MAY88 Me 6-3. Replaceable PartsReference HP Part Designation Number Not Assigned Connector Spin M Post Type DIODE-SWITCHING 80V 200MA 2NS DO45CONNECTOR-RFSMC M PC 5 W H M CONNECTOR-RF SMC M PC W H MReference Mfr HP Part Description Cable 6-3.Replaceable PartsRESISTOR-TRMR 1K 10% C TOP-ADJ 17-TRN RESISTOR-TRMR20K 10% C TOP-ADJ 17-TRN0698-3430 Mfr. Part NumberDescription Mfr Rev.17MAY88IC OP AMP Prcn 8-DIP-C PKG Transistor Array 16-PIN Plstc DIPIC Instm Ampl CUR 10-DIP-P PKG IC OP AMP LOW-BIAS-H-IMPD 8-DIP4 PKGHPPart Description Nble 6-3. Replaceable PartsL e 6-3. Replaceable Parts A10Ble 6-3.Replaceable Parts Miscellaneous PartsHPPart Designation Number Code Reference HPPart Description MfrRnftsund Plstem DOME-HD .125DIA Deck AssyRIVET-BUND PL-STEM DOME-HD .125DIA RIVET-BUND Plstem Domehd .125DIANot Separaretlyreplaceable PANEL, Front AYKeypad Punched Shield DisplayQW. Description Reference HPPart Designation NumberQty.Description Designation Code Mfrm Mfr. Part Number Code Lbble 6-3. Replaceable PartsOrder by Description IZZ-9 Main Deck Assembly Top, 2923A and above Model 8904A Main Deck Assembly Bottom Main Deck Assembly Bottom, Option 006 2948A and above Reu.30NOV89 Front Panel Assembly, 2923A and above Rent Panel Assembly, Option 006 2948A and above Reu.30NOV89 Rear Panel Assembly Rear Panel Assembly, Option 005 2948A and above Rev.30N0 Rev.ZSSEP88 Covers, Labels, and ROMsOutput Cables 1 Output Cables, Option 005 29484 and above 2 Rev.30N0V89 Table of Contents Rev.15DEC89 Option ConversionsNumber 2942A and below Titled Hardware Modifications Instrument ModificationsRevision 22987A with HP 08904-8701 0 as A2U12 FRONT-TO-REAR-PANELOUTPUT Conversion Description Modification ProcedureParts Required Tools RequiredOperation Verification Fl Channel ConfigDescription REAR-TO-FRONT-PANELOUTPUT ConversionRev.15DEC89 Rear-to-Front-Panel Output Conversion Fl Channel Config Ront Panel Output Hardware Output Cable Routing ALL Options Rev.01JUL91 Firmware UpdatesBardware Modifications Firmware Updates A2U12 and A2U13Different function Serial Prefix 2737A and below Modification for Possible Ground Wire Shock HazardFirmware Updates/Hardware Modifications Parts Location Shown with Power Supply RemovedFirmware Updates/Hardware Modifications Ground Wire WrappingModification for Output Overvoltage Protection Improvement Parts ListHPPartNumber ~~ Qty Description Fixed Resistor, 261 orCabinet Parts Color Change Modification for Potential Power Supply ShortReu.15DEC89 Firmware UpdatesIHardwareModifications 1. Modificationfor Front Panel AssemblyRemoving the Front Panel Installingthe Front Panel Dont-Panel Assembly, 2923A and above Section Service A3 or A10 Output Assembly Phase Synchronization OptionBefore Applying Power Safety ConsiderationsHOW the Section is Organized Iwarning Schematic Symbology and Schematic Diagram Notes Service TOOLS, HELPS, and InformationPin of socket Schematic Diagram Notes 1Schematic Diagram Notes 2 Schematic Diagram Notes 3 Digital Symbology Reference Information Llzble 8-1.Schematic Diagram Notes 4Combinational Logic Symbols and Functions Schematic Diagram Notes 5Schematic Diagram Notes 6 Digital Symbology Reference InformationOnly with D-type flip-flops Gate and Dependency-Binary Schematic Diagram Notes 7Miscellaneous Llable 8-1.Schematic Diagram Notes 8ofSchematic Diagram Notes 9 ServiceActive Levels Schematic Diagram Notes 10Enable Schematic Diagram Notes 11What the Multifunction Synthesizer Can Do Principles of Operation OverallHow Waveforms Are Generated Channel a Generating Staircases in the Phase Accumulator Output of the Phase Adder for P=O, 1, Further Digital Waveform Processing with Options Pulse Phase @PHASE FreouencyFreouency SUM Pulse Level Interrelationshipof the Circuit Assemblies Analog Waveform ProcessingReu.15DEC89 Principles of Operation Overall Synthesizer PASSY- t General A2 Digital AssemblyDigital-to-Analog Converter Service Sheet A3 Output Assembly Service Sheets 1 through GeneralTrack-and-Hold Circuit Service Sheet Simplified Diagram of the Sampler Drive 10.Simplified Diagram of the Sampler Amplifier Audio Amplifier Service Sheet Low-Pass Filters Service SheetSine X/X CompensationService Sheet 12, and 24 dB Attenuators Service SheetFloating Output Amplifier Service Sheet Floating Amplifier Driver and On/Off Switch Service SheetOvervoltage Protectionand Output Circuits Service Sheet Rev.15DEC89 Troubleshooting General Troubleshooting GeneralProcedure A2 Digital Assembly to A3 or A10 Output Assembly InterfaceEquipment 1. How to Access A3 in Instruments Equipped with Option Serial Prefix Troubleshooting Digital/Output InterfacePeriod Fl Channel ConfigPin Frequency Hz Fl Channel ConfigA3/A10 Connection Function A3 Key Sequence A10 Key SequenceIC Pin Level F3 Memory Map Access Pin Clocks A10J1 and J5 Miscellaneous ControlFl Keyboard Check A2 Digital Assembly to A1 Keyboard Assembly InterfacePin Key Pressed Response lTL AMPTD, Wave FormKey Sequence Annunciator Status IC on A2 Pin Level lTL F3 Memory Map AccessDescription A2 Digital Assembly to A5 Display Assembly InterfaceA3 or A10 Output Assembly Troubleshooting Phase Synchronization Phase SynchronizationoptionHP 8904A Opts After keying in 8 7, the display should be IFirmware Revision 18387A Serial No HP 8904A Opts 02/01 IFirmware Revision 18387A Serial NoAfter keying in 4 8, the display should be Begin again at step Troubleshooting Memory Backup Battery 48.1 HOW to Replace the Memory Backup BatteryTools and Supplies PartsTroubleshooting Memory Backup Battery 48.3 Rev.15DEC89 Troubleshooting Memory Backup BatteryPage N a 12.4. Line Voltage Wiring Harness R300 A3 Component Coordinates 1L0nA Current Source Ipower Supply ConditionersComp A3 Component Coordinates 2Ss2 On the A3 schematicRev.28MAR89 31901 N3AILlO ONV I813IldIll3 JJOlfl3 dWHS15.Service Sheet Information Component Locator Rev.28MAR89 54.1 ChangesAmpto Instrument Settings Measure Aooitions I T I a L Instrument SettingsCoup OUT K2AComponent Coordinates 1 + a56.1 Ss4Ss4 A6 Schematic and Component locator Ss5 0 A3/A10 Output Assembly