A3 or A10 Output Assembly, Description | Agilent Technologies 2712A

Service

Model 8904A

A3 OR A10 OUTPUT ASSEMBLY

Description

The following procedure will assist in locating a fault on the A3 or A10 Output Assembly. It is wise to perform the procedure titled A2 Digital Assembly to A3 (or A10) Output Assembly Interface first to confirm that the fault is indeed on the Output Assembly.

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.

Equipment

Oscilloscope ..................................................... HP 1740A or Tektronix 2235

Procedure

1.If the A3 Output Assembly is to be checked and the instrument also has an A10 Output Assembly (Option 002) present, move the A10 assembly out of the way by following the procedure of Figure 8-11,How to Access A3 in Instruments Equipped with Option 002.

2.To troubleshoot the Output Assembly,

a. Turn to the schematic diagram (Service Sheets 1through 4) of the circuit that is suspect.

b.Set the instrument as instructed in the boxed text entitled “INITIAL INSTRUMENT SETTINGS”.

c.Connect the oscilloscope to the point to be tested.

d.Alter the instrument settings if instructed by the troubleshooting text for that testpoint, and make the measurement.

8-42Troubleshooting (A3 or A10 Assembly)

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Agilent Technologies 2712A, 2948 manual A3 or A10 Output Assembly, Description

Contents

Agilent Technologies Innovating the HPWay Multifunction Synthesizer Copyright@ HEWLETT-PACKARD Company Regulatory Information Safety Considerations Safety Considerationsfor this Instrument Product Markings Contents Service cont’d Section Reu.200CT88 Reference Designationsand Abbreviations Used in this Manual Replaceable Parts ListIntroductionto this Section Replaceable Parts List Updating Manual Updates How to Order Abbreviations 1 AccessNable 6-1.Reference Designations ALC Abbreviations 2 Description Replaceable PartsRev.01JUL91 Number Code CAPACITOR-FXD22PF +-5% Poovdc CER 0+-30 Not Assigned Fible 6-3.Replaceable PartsHPPart Description Number Mfr- Mfr. Part Number Code Reference HP Part Description Designation Number Reference HP Part Description Designation Number Mfr Reference HP Part Designation Number Me 6-3. Replaceable PartsRev.1 7MAY88 CONNECTOR-RFSMC M PC 5 W H M DIODE-SWITCHING 80V 200MA 2NS DO45Not Assigned Connector Spin M Post Type CONNECTOR-RF SMC M PC W H M Reference Mfr RESISTOR-TRMR 1K 10% C TOP-ADJ 17-TRN Cable 6-3.Replaceable PartsHP Part Description RESISTOR-TRMR20K 10% C TOP-ADJ 17-TRN Mfr. Part Number 0698-3430 Rev.17MAY88 Description Mfr IC Instm Ampl CUR 10-DIP-P PKG Transistor Array 16-PIN Plstc DIPIC OP AMP Prcn 8-DIP-C PKG IC OP AMP LOW-BIAS-H-IMPD 8-DIP4 PKG Nble 6-3. Replaceable Parts HPPart Description A10 L e 6-3. Replaceable Parts HPPart Miscellaneous PartsBle 6-3.Replaceable Parts Reference HPPart Description Mfr Designation Number Code RIVET-BUND PL-STEM DOME-HD .125DIA Deck AssyRnftsund Plstem DOME-HD .125DIA RIVET-BUND Plstem Domehd .125DIA Keypad Punched PANEL, Front AYNot Separaretlyreplaceable Shield Display Reference HPPart Designation Number QW. Description Qty.Description Designation Code Order by Description Lbble 6-3. Replaceable PartsMfrm Mfr. Part Number Code 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 Covers, Labels, and ROMs Rev.ZSSEP88 Output Cables 1 Output Cables, Option 005 29484 and above 2 Rev.30N0V89 Table of Contents Number 2942A and below Option ConversionsRev.15DEC89 Revision 22987A with HP 08904-8701 0 as A2U12 Instrument ModificationsTitled Hardware Modifications Parts Required Modification ProcedureFRONT-TO-REAR-PANELOUTPUT Conversion Description Tools Required Fl Channel Config Operation Verification Rev.15DEC89 Rear-to-Front-Panel Output Conversion REAR-TO-FRONT-PANELOUTPUT ConversionDescription Fl Channel Config Ront Panel Output Hardware Output Cable Routing ALL Options Different function Firmware Updates A2U12 and A2U13Rev.01JUL91 Firmware UpdatesBardware Modifications Modification for Possible Ground Wire Shock Hazard Serial Prefix 2737A and below Parts Location Shown with Power Supply Removed Firmware Updates/Hardware Modifications Ground Wire Wrapping Firmware Updates/Hardware Modifications HPPartNumber ~~ Qty Description Parts ListModification for Output Overvoltage Protection Improvement Fixed Resistor, 261 or Modification for Potential Power Supply Short Cabinet Parts Color Change 1. Modificationfor Front Panel Assembly Reu.15DEC89 Firmware UpdatesIHardwareModifications Removing the Front Panel Installingthe Front Panel Dont-Panel Assembly, 2923A and above A3 or A10 Output Assembly Phase Synchronization Option Section Service HOW the Section is Organized Safety ConsiderationsBefore Applying Power Iwarning Service TOOLS, HELPS, and Information Schematic Symbology and Schematic Diagram Notes Schematic Diagram Notes 1 Pin of socket Schematic Diagram Notes 2 Schematic Diagram Notes 3 Llzble 8-1.Schematic Diagram Notes 4 Digital Symbology Reference Information Schematic Diagram Notes 5 Combinational Logic Symbols and Functions Digital Symbology Reference Information Schematic Diagram Notes 6 Schematic Diagram Notes 7 Only with D-type flip-flops Gate and Dependency-Binary Llable 8-1.Schematic Diagram Notes 8of Miscellaneous Service Schematic Diagram Notes 9 Schematic Diagram Notes 10 Active Levels Schematic Diagram Notes 11 Enable How Waveforms Are Generated Principles of Operation OverallWhat the Multifunction Synthesizer Can Do Channel a Generating Staircases in the Phase Accumulator Output of the Phase Adder for P=O, 1, Further Digital Waveform Processing with Options Freouency SUM Pulse Level Phase @PHASE FreouencyPulse Reu.15DEC89 Principles of Operation Overall Analog Waveform ProcessingInterrelationshipof the Circuit Assemblies Synthesizer PASSY- t A2 Digital Assembly General Track-and-Hold Circuit Service Sheet A3 Output Assembly Service Sheets 1 through GeneralDigital-to-Analog Converter Service Sheet Simplified Diagram of the Sampler Drive 10.Simplified Diagram of the Sampler Amplifier Sine X/X CompensationService Sheet Low-Pass Filters Service SheetAudio Amplifier Service Sheet 12, and 24 dB Attenuators Service Sheet Overvoltage Protectionand Output Circuits Service Sheet Floating Amplifier Driver and On/Off Switch Service SheetFloating Output Amplifier Service Sheet Troubleshooting General Rev.15DEC89 Troubleshooting General Equipment A2 Digital Assembly to A3 or A10 Output Assembly InterfaceProcedure 1. How to Access A3 in Instruments Equipped with Option Troubleshooting Digital/Output Interface Serial Prefix Fl Channel Config Period Fl Channel Config Pin Frequency Hz IC Pin Level Function A3 Key Sequence A10 Key SequenceA3/A10 Connection F3 Memory Map Access J1 and J5 Clocks A10Pin Miscellaneous Control A2 Digital Assembly to A1 Keyboard Assembly Interface Fl Keyboard Check AMPTD, Wave Form Pin Key Pressed Response lTL F3 Memory Map Access Key Sequence Annunciator Status IC on A2 Pin Level lTL A2 Digital Assembly to A5 Display Assembly Interface Description A3 or A10 Output Assembly Phase Synchronizationoption Troubleshooting Phase Synchronization HP 8904A Opts After keying in 8 7, the display should be IFirmware Revision 18387A Serial No IFirmware Revision 18387A Serial No HP 8904A Opts 02/01 After keying in 4 8, the display should be Begin again at step Tools and Supplies HOW to Replace the Memory Backup BatteryTroubleshooting Memory Backup Battery 48.1 Parts Troubleshooting Memory Backup Battery Rev.15DEC89 Troubleshooting Memory Backup Battery 48.3Page N a 12.4. Line Voltage Wiring Harness A3 Component Coordinates 1 R300 Ipower Supply Conditioners L0nA Current Source A3 Component Coordinates 2 Comp Rev.28MAR89 On the A3 schematicSs2 I813IldIll3 JJOlfl3 dWHS 31901 N3AILlO ONV 15.Service Sheet Information Component Locator Changes Rev.28MAR89 54.1 Coup OUT Aooitions I T I a L Instrument SettingsAmpto Instrument Settings Measure K2A + a Component Coordinates 1 Ss4 56.1 Ss4 A6 Schematic and Component locator Ss5 Output Assembly 0 A3/A10