Installingthe Front Panel | Agilent Technologies 2948, 2712A

Model 8904A

Instrument Changes

Installingthe Front Panel

16.Remove any existing, unneeded hole plugs from the new front-panel assembly.

17.Install the line switch bracket supplied in the kit (HP 08904-00022, item 142 in figure 7-6,Detail A herein) on to the line switch using the two Pozidriv screws supplied in the kit (HP 0515-2028, items 143 and 144).Tighten the screws to 0.6 N.m (5 in.lb).

18.Install the line switch bracket on to the front frame using two of the screws (items 84 and 145 in figure 7-6) securing the old front panel to the frame (item 89). Do not tighten the screws at this time.

19.Connect the wide ribbon cable (AlW1 in figure 1)from the new keyboard to the front of the A2 Digital Assembly. Be careful not to bend any pins.

20.Place the new front panel into the frame and loosely secure the assembly to the frame on the top and sides with the original screws. Check that the cables to the front panel and the line switch keycap are positioned correctly before pushing the front panel completely into the frame.

21.Tighten the screws in the frame in the following sequence: item 76, 80, 81, 75, 78, 77, then 79. Tighten the screws to 1.3 N.m (11in.lb). If the top screws bind, remove the front panel and try repositioning the display shield installed in step 15.

22.Position the line switch in the frame and the hole in the front panel then tighten the securing screws (items 84 and 145). Tighten the screws to 1.3 N.m (11in.lb).

23.Re-install the BNC connectors to the new front panel as applicable. Be sure the connectors go to the proper front-panel holes.

24.Reconnect the two connectors from the A5 LCD Display to the A2 Digital Assembly.

Final Assembly and Testing

25.Re-install the top and side trim strips and the covers.

26.Check the general functioning of the instrument by performing the Basic Functional Checks in the Operation and Calibration Manual. Also, check the functioning of all front-panel keys and the line switch.

rev.15DEC89

Firmware Updates/Hardware Modifications

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Agilent Technologies 2948, 2712A manual Installingthe Front Panel

Contents

Innovating the HPWay Agilent Technologies Copyright@ HEWLETT-PACKARD Company Multifunction Synthesizer Regulatory Information Safety Considerations Safety Considerationsfor this Instrument Product Markings Contents Reu.200CT88 Service cont’d Section Reference Designationsand Abbreviations Used in this Manual Replaceable Parts ListIntroductionto this Section How to Order Replaceable Parts List Updating Manual Updates Nable 6-1.Reference Designations AccessAbbreviations 1 ALC Abbreviations 2 Rev.01JUL91 Replaceable PartsDescription Number Code CAPACITOR-FXD22PF +-5% Poovdc CER 0+-30 Not Assigned Fible 6-3.Replaceable PartsHPPart Description Number Mfr- Mfr. Part Number Code Designation Number Reference HP Part Description Mfr Reference HP Part Description Designation Number Reference HP Part Designation Number Me 6-3. Replaceable PartsRev.1 7MAY88 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 M Reference Mfr HP Part Description Cable 6-3.Replaceable PartsRESISTOR-TRMR 1K 10% C TOP-ADJ 17-TRN RESISTOR-TRMR20K 10% C TOP-ADJ 17-TRN 0698-3430 Mfr. Part Number Description Mfr Rev.17MAY88 IC 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 PKG HPPart Description Nble 6-3. Replaceable Parts L e 6-3. Replaceable Parts A10 HPPart Miscellaneous PartsBle 6-3.Replaceable Parts Designation Number Code Reference HPPart Description Mfr Rnftsund Plstem DOME-HD .125DIA Deck AssyRIVET-BUND PL-STEM DOME-HD .125DIA RIVET-BUND Plstem Domehd .125DIA Not Separaretlyreplaceable PANEL, Front AYKeypad Punched Shield Display QW. Description Reference HPPart Designation Number 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 Rev.ZSSEP88 Covers, Labels, and ROMs 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 FRONT-TO-REAR-PANELOUTPUT Conversion Description Modification ProcedureParts Required Tools Required Operation Verification Fl Channel Config 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 Serial Prefix 2737A and below Modification for Possible Ground Wire Shock Hazard Firmware Updates/Hardware Modifications Parts Location Shown with Power Supply Removed Firmware Updates/Hardware Modifications Ground Wire Wrapping Modification for Output Overvoltage Protection Improvement Parts ListHPPartNumber ~~ Qty Description Fixed Resistor, 261 or Cabinet Parts Color Change Modification for Potential Power Supply Short Reu.15DEC89 Firmware UpdatesIHardwareModifications 1. Modificationfor Front Panel Assembly Removing the Front Panel Installingthe Front Panel Dont-Panel Assembly, 2923A and above Section Service A3 or A10 Output Assembly Phase Synchronization Option HOW the Section is Organized Safety ConsiderationsBefore Applying Power Iwarning Schematic Symbology and Schematic Diagram Notes Service TOOLS, HELPS, and Information Pin of socket Schematic Diagram Notes 1 Schematic Diagram Notes 2 Schematic Diagram Notes 3 Digital Symbology Reference Information Llzble 8-1.Schematic Diagram Notes 4 Combinational Logic Symbols and Functions Schematic Diagram Notes 5 Schematic Diagram Notes 6 Digital Symbology Reference Information Only with D-type flip-flops Gate and Dependency-Binary Schematic Diagram Notes 7 Miscellaneous Llable 8-1.Schematic Diagram Notes 8of Schematic Diagram Notes 9 Service Active Levels Schematic Diagram Notes 10 Enable Schematic Diagram Notes 11 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 General A2 Digital Assembly 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 Audio Amplifier Service Sheet Low-Pass Filters Service SheetSine X/X CompensationService 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 Rev.15DEC89 Troubleshooting General Troubleshooting General Equipment A2 Digital Assembly to A3 or A10 Output Assembly InterfaceProcedure 1. How to Access A3 in Instruments Equipped with Option Serial Prefix Troubleshooting Digital/Output Interface Period Fl Channel Config Pin Frequency Hz Fl Channel Config IC Pin Level Function A3 Key Sequence A10 Key SequenceA3/A10 Connection F3 Memory Map Access Pin Clocks A10J1 and J5 Miscellaneous Control Fl Keyboard Check A2 Digital Assembly to A1 Keyboard Assembly Interface Pin Key Pressed Response lTL AMPTD, Wave Form Key Sequence Annunciator Status IC on A2 Pin Level lTL F3 Memory Map Access Description A2 Digital Assembly to A5 Display Assembly Interface A3 or A10 Output Assembly Troubleshooting Phase Synchronization Phase Synchronizationoption HP 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 No After 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 Parts Troubleshooting Memory Backup Battery 48.3 Rev.15DEC89 Troubleshooting Memory Backup BatteryPage N a 12.4. Line Voltage Wiring Harness R300 A3 Component Coordinates 1 L0nA Current Source Ipower Supply Conditioners Comp A3 Component Coordinates 2 Rev.28MAR89 On the A3 schematicSs2 31901 N3AILlO ONV I813IldIll3 JJOlfl3 dWHS 15.Service Sheet Information Component Locator Rev.28MAR89 54.1 Changes Ampto Instrument Settings Measure Aooitions I T I a L Instrument SettingsCoup OUT K2A Component Coordinates 1 + a 56.1 Ss4 Ss4 A6 Schematic and Component locator Ss5 0 A3/A10 Output Assembly