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Agilent Technologies 2712A, 2948 manual Rev.15DEC89 Troubleshooting Memory Backup Battery, 48.3

Models: 2712A 2948

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Model 8904A

Service

5. Desolder the three leads of the backup battery (A2B1) with a solder removal tool and remove the battery.

6a. If the instrument has serial prefix 2942A and below, put the three insulators (HP 3050-0990)on the leads of the new battery (A2B1, HP 1420-0281)and solder in the battery. The bottom of the battery case must not touch the circuit board or any solder pads.

6b. If the instrument has serial prefix 2948A and above, solder in the battery (A2B1, HP 1420-0338).

7.Remove the resistor and temporary backup connections on the A2 assembly.

8.Re-install the A2 assembly and all connectors.

9.Place the instrument in its normal operating position. Re-insert the power cord and switch LINE to ON.

10.Press SHIFT PRESET. The display should show the correct instrument serial number suffix for a few seconds.

11.Re-install the instrument’s top cover.

rev.15DEC89

Troubleshooting (Memory Backup Battery)

8-48.3

Image 120

Agilent Technologies 2712A, 2948 manual Rev.15DEC89 Troubleshooting Memory Backup Battery, 48.3

Contents

Agilent Technologies Innovating the HPWayMultifunction Synthesizer Copyright@ HEWLETT-PACKARD CompanyRegulatory Information Safety Considerations Safety Considerationsfor this Instrument Product Markings Contents Service cont’d Section Reu.200CT88Replaceable Parts List Introductionto this SectionReference Designationsand Abbreviations Used in this Manual Replaceable Parts List Updating Manual Updates How to OrderAccess Nable 6-1.Reference DesignationsAbbreviations 1 ALCAbbreviations 2 Replaceable Parts Rev.01JUL91Description Number CodeFible 6-3.Replaceable Parts HPPart Description Number Mfr- Mfr. Part Number CodeCAPACITOR-FXD22PF +-5% Poovdc CER 0+-30 Not Assigned Reference HP Part Description Designation NumberReference HP Part Description Designation Number MfrMe 6-3. Replaceable Parts Rev.1 7MAY88Reference HP Part Designation Number DIODE-SWITCHING 80V 200MA 2NS DO45 Not Assigned Connector Spin M Post TypeCONNECTOR-RFSMC M PC 5 W H M CONNECTOR-RF SMC M PC W H MReference Mfr Cable 6-3.Replaceable Parts HP Part DescriptionRESISTOR-TRMR 1K 10% C TOP-ADJ 17-TRN RESISTOR-TRMR20K 10% C TOP-ADJ 17-TRNMfr. Part Number 0698-3430Rev.17MAY88 Description MfrTransistor Array 16-PIN Plstc DIP IC OP AMP Prcn 8-DIP-C PKGIC Instm Ampl CUR 10-DIP-P PKG IC OP AMP LOW-BIAS-H-IMPD 8-DIP4 PKGNble 6-3. Replaceable Parts HPPart DescriptionA10 L e 6-3. Replaceable PartsMiscellaneous Parts Ble 6-3.Replaceable PartsHPPart Reference HPPart Description Mfr Designation Number CodeDeck Assy Rnftsund Plstem DOME-HD .125DIARIVET-BUND PL-STEM DOME-HD .125DIA RIVET-BUND Plstem Domehd .125DIAPANEL, Front AY Not SepararetlyreplaceableKeypad Punched Shield DisplayReference HPPart Designation Number QW. DescriptionQty.Description Designation Code Lbble 6-3. Replaceable Parts Mfrm Mfr. Part Number CodeOrder 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 Covers, Labels, and ROMs Rev.ZSSEP88Output Cables 1 Output Cables, Option 005 29484 and above 2 Rev.30N0V89 Table of Contents Option Conversions Rev.15DEC89Number 2942A and below Instrument Modifications Titled Hardware ModificationsRevision 22987A with HP 08904-8701 0 as A2U12 Modification Procedure FRONT-TO-REAR-PANELOUTPUT Conversion DescriptionParts Required Tools RequiredFl Channel Config Operation VerificationREAR-TO-FRONT-PANELOUTPUT Conversion DescriptionRev.15DEC89 Rear-to-Front-Panel Output Conversion Fl Channel Config Ront Panel Output Hardware Output Cable Routing ALL Options Firmware Updates A2U12 and A2U13 Rev.01JUL91 Firmware UpdatesBardware ModificationsDifferent function Modification for Possible Ground Wire Shock Hazard Serial Prefix 2737A and belowParts Location Shown with Power Supply Removed Firmware Updates/Hardware ModificationsGround Wire Wrapping Firmware Updates/Hardware ModificationsParts List Modification for Output Overvoltage Protection ImprovementHPPartNumber ~~ Qty Description Fixed Resistor, 261 orModification for Potential Power Supply Short Cabinet Parts Color Change1. Modificationfor Front Panel Assembly Reu.15DEC89 Firmware UpdatesIHardwareModificationsRemoving the Front Panel Installingthe Front Panel Dont-Panel Assembly, 2923A and above A3 or A10 Output Assembly Phase Synchronization Option Section ServiceSafety Considerations Before Applying PowerHOW the Section is Organized Iwarning Service TOOLS, HELPS, and Information Schematic Symbology and Schematic Diagram NotesSchematic Diagram Notes 1 Pin of socketSchematic Diagram Notes 2 Schematic Diagram Notes 3 Llzble 8-1.Schematic Diagram Notes 4 Digital Symbology Reference InformationSchematic Diagram Notes 5 Combinational Logic Symbols and FunctionsDigital Symbology Reference Information Schematic Diagram Notes 6Schematic Diagram Notes 7 Only with D-type flip-flops Gate and Dependency-BinaryLlable 8-1.Schematic Diagram Notes 8of MiscellaneousService Schematic Diagram Notes 9Schematic Diagram Notes 10 Active LevelsSchematic Diagram Notes 11 EnablePrinciples of Operation Overall What the Multifunction Synthesizer Can DoHow 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 Phase @PHASE Freouency PulseFreouency SUM Pulse Level Analog Waveform Processing Interrelationshipof the Circuit AssembliesReu.15DEC89 Principles of Operation Overall Synthesizer PASSY- t A2 Digital Assembly GeneralA3 Output Assembly Service Sheets 1 through General Digital-to-Analog Converter Service SheetTrack-and-Hold Circuit Service Sheet Simplified Diagram of the Sampler Drive 10.Simplified Diagram of the Sampler Amplifier Low-Pass Filters Service Sheet Audio Amplifier Service SheetSine X/X CompensationService Sheet 12, and 24 dB Attenuators Service SheetFloating Amplifier Driver and On/Off Switch Service Sheet Floating Output Amplifier Service SheetOvervoltage Protectionand Output Circuits Service Sheet Troubleshooting General Rev.15DEC89 Troubleshooting GeneralA2 Digital Assembly to A3 or A10 Output Assembly Interface ProcedureEquipment 1. How to Access A3 in Instruments Equipped with Option Troubleshooting Digital/Output Interface Serial PrefixFl Channel Config PeriodFl Channel Config Pin Frequency HzFunction A3 Key Sequence A10 Key Sequence A3/A10 ConnectionIC Pin Level F3 Memory Map Access Clocks A10 PinJ1 and J5 Miscellaneous ControlA2 Digital Assembly to A1 Keyboard Assembly Interface Fl Keyboard CheckAMPTD, Wave Form Pin Key Pressed Response lTLF3 Memory Map Access Key Sequence Annunciator Status IC on A2 Pin Level lTLA2 Digital Assembly to A5 Display Assembly Interface DescriptionA3 or A10 Output Assembly Phase Synchronizationoption Troubleshooting Phase SynchronizationHP 8904A Opts After keying in 8 7, the display should be IFirmware Revision 18387A Serial No IFirmware Revision 18387A Serial No HP 8904A Opts 02/01After keying in 4 8, the display should be Begin again at step HOW to Replace the Memory Backup Battery Troubleshooting Memory Backup Battery 48.1Tools and Supplies PartsTroubleshooting Memory Backup Battery Rev.15DEC89 Troubleshooting Memory Backup Battery 48.3Page N a 12.4. Line Voltage Wiring Harness A3 Component Coordinates 1 R300Ipower Supply Conditioners L0nA Current SourceA3 Component Coordinates 2 CompOn the A3 schematic Ss2Rev.28MAR89 I813IldIll3 JJOlfl3 dWHS 31901 N3AILlO ONV15.Service Sheet Information Component Locator Changes Rev.28MAR89 54.1Aooitions I T I a L Instrument Settings Ampto Instrument Settings MeasureCoup OUT K2A+ a Component Coordinates 1Ss4 56.1Ss4 A6 Schematic and Component locator Ss5 Output Assembly 0 A3/A10