To Replace the Power-Line Fuse | Agilent Technologies 33120A

Chapter 6 Service

To Replace the Power-Line Fuse

To Replace the Power-Line Fuse

The power-line fuse is located within the function generator’s fuse-holder assembly on the rear panel (see page 22). The function generator is shipped from the factory with a 500 mAT slow-blow fuse installed (part number 2110-0458). This is the correct fuse for all line voltages.

To Replace the Output Protection Fuse (F801)

The Output Protection Fuse is located inside the function generator. This fuse is a thru-hole soldered 500 mA part (part number 2110-0716). The fuse is located near the output connector (J801) on the main PC board. You will need to disassemble the function generator to replace this fuse (use a TORX T-15 driver to remove the screws located on the rear panel). The disassembly procedure is shown on page 130.

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Agilent Technologies 33120A manual To Replace the Power-Line Fuse, To Replace the Output Protection Fuse F801

Contents

Agilent 33120A MHz Function Arbitrary Waveform Generator Service GuidePage Flexible system features Convenient bench-top features Front Panel at a Glance Front-Panel Number Entry MODulation Menu Front-Panel Menu at a Glance Trig Display Annunciators Use the front-panel Input / Output Menu to Rear Panel at a Glance This Book Page Contents Contents Schematics ServiceReplaceable Parts Contents Specifications Waveforms Modulation Characteristics General Specifications Product Dimensions Page Quick Start Quick Start Connect the power cord and turn on the function generator One User’s Guide 〈 This Service GuideTo prepare the function generator for use Check the list of supplied items Verify the power-line voltage setting Verify that there is ac power to the function generatorVerify that the power-line fuse is good If the function generator does not turn on Remove the power cord . Remove To adjust the carrying handle To set the output frequency To cancel the number mode, press Shift CancelEnter the magnitude of the desired frequency Set the units to the desired value Enter the magnitude of the desired amplitude To set the output amplitude Enable the offset modify mode How to change the offset to -1.5 mVdcTo set a dc offset voltage Enter the magnitude of the desired offset Select the square wave function To set the duty cycleEnter the desired duty cycle Output the waveform with the displayed duty cycle Display the list of arbitrary waveforms To output a stored arbitrary waveformMove across to the Exprise choice Select and output the displayed arbitrary waveform Enter the magnitude of the desired voltage To output a dc voltage Turn on the state storage mode Set up the function generator to the desired configurationTo store the instrument state Save the instrument state Recall the stored instrument state Restore the instrument state To rack mount the function generator Quick Start Front-Panel Menu Operation Front-Panel Menu Operation MODulation Menu Front-panel menu reference Front-panel menu reference SYStem Menu Front-panel menu tutorial Messages Displayed During Menu Use Turn on the menu Move across to the Power on command on this levelMove across to the SYS Menu choice on this level Move down a level to the Parameter choices Cycle the power to restore the default valuesSave the change and turn off the menu Increment the first digit until 300.0 mVPP is displayed Select amplitude adjustment To select the output termination Move down a level to the OUT Term commandMove down a level and then across to the High Z choice Select AM To output a modulated waveformUse the menu to select the shape of the modulating waveform Set the modulating frequency to 200 Hz Move down a level verify that Sine is selectedSet the modulation depth to 80% To unsecure the function generator for calibration Move down a level to the Secured commandMove across to the CAL Menu choice on this level Move down to the parameters level Calibration Procedures Calibration Procedures Calibration Interval Agilent Calibration ServicesTime Required for Calibration Recommended Test Equipment Automating Calibration Procedures Test Considerations Self-Test Performance Verification Tests Quick Performance Check Function Gain and Linearity Verification Frequency Verification AC Amplitude Verification DC Function Offset Verification AC Amplitude Verification Vrms 0.00035 Vrms 15.00 MHz Amplitude Flatness Verification Vrms 0.0061 Vrms AM Modulation Depth Verification Square Wave Duty Cycle Verification Optional Performance Verification Tests Distortion Verification Characters Calibration Security Code To Unsecure the Function Generator Without the Security Code Calibration Message Calibration Count Move down a level to the Unsecured command General Calibration/Adjustment ProcedureBegin the Frequency and Burst Rate adjustment procedure Move across to the Calibrate choice Calculate and save the new value Perform the next adjustment procedure Aborting a Calibration in Progress Frequency and Burst Rate Adjustment AC Amplitude Adjustment High-Z Function Gain and Linearity Adjustment AC Amplitude Adjustment High-Z Frequency Amplitude Modulation Adjustment AC Amplitude Adjustment 50W AC Amplitude Adjustment 50W Adjustment for KHz Setup DC Output Adjustment AC Amplitude Flatness Adjustment Duty Cycle Adjustment AC Amplitude Flatness Adjustment Exiting Output Amplifier Adjustment Optional System Error Messages Error MessagesSelf-Test Error Messages Calibration Error Messages Theory of Operation Theory of Operation Self-test procedures are described in chapter This discussion pertains to the block diagram shown on Block Diagram Overview Output Attenuator Block 8 on block diagram page 129 Schematic on Output Amplifier Block 7 on block diagram page 129 Schematic on 740 R710 R717 740 R710 R711 R715 R716 R719 R720 AM Modulation Block 6 on block diagram page 129, schematic on Block 6 on block diagram page 129 Schematic onPre-attenuator Square Wave and Sync Square Wave and Sync Filters Block 5 on block diagram page 129 Schematic on Waveform DAC/Amplitude Leveling/Waveform RAM Block 4 on block diagram page 129 Schematic on Waveform DAC/Amplitude Leveling/Waveform RAM Direct Digital Synthesis DDS Asic Block 2 on block diagram page 129 Schematic on System DACs Block 3 on block diagram page 129 Schematic on Floating Logic Block 1 on block diagram page 129 Schematic on Block 9 on block diagram page 129 Schematic on Power SuppliesBlock 10 on block diagram page 129 Schematic on Earth-Referenced Logic Power Supplies Display and Keyboard Block 11 on block diagram page 129 Schematic onSee Service Service Is the function generator inoperative? Operating ChecklistSee To prepare the function generator for use on Does the function generator fail self-test? Call 1-877-447-7278 and ask for Agilent Express Types of Service Available Repackaging for Shipment CleaningAgilent suggests that you always insure shipments Surface Mount Repair Electrostatic Discharge ESD Precautions To Replace the Output Protection Fuse F801 To Replace the Power-Line Fuse Unit Reports Error Troubleshooting HintsUnit is Inoperative Unit Fails Self-Test Power Supply Problems Power-On Self-Test Self-Test Procedures 625 112 Replaceable Parts Replaceable Parts Main PC Assembly 116 117 118 119 120 121 122 123 Display and Keyboard PC Assembly 33120A Mainframe Manufacturer’s List Schematics8 Schematics Block Diagram Pull Off Handle Loosen Captive Sheet 1 132 Sheet 3 Sheet 4 Waveform DAC Schematic 134 Sheet 5 136 Sheet 7 Sheet 8 Output Attenuator Schematic 138 Sheet 9 of 10 Earth Reference Logic Schematic Sheet 10 Power Supplies Schematic 140 Sheet 1 of 1 Display and Keyboard Schematic TOP Side 33120-66521 REV a TOP Side 33120-66502 REV C Manual Part Number