Power Distribution Board, 165 | Agilent Technologies 1690, 1680

Chapter 8: Theory of Operation

Agilent 1680A,AD-series Logic Analyzer Theory

Power Distribution Board

The power distribution board connects directly to the power supply and distributes power to the rest of the boards in the system including the motherboard. It also distributes power to the disk drives, fan, and CD-ROM. It has circuity for regulating fan voltage that is temperature dependent as well as detecting when a fan ceases to spin.

The board also converts standard ATX IDE interface signals into those used by notebook flexible disk drives and hard disk drives if needed in the system. The power distribution also distributes various signals between boards such as serial lines and front panel ID signals that connect between the acquisition board and the front panel board.

Front Panel Board

The front panel board contains a microcontroller that is powered from 5V. This particular 5V line comes from a standby rail that is supplied as long as the unit is connected to AC power. The standby rail powers the microcontoller and some core circuitry on the front panel board. The remaining circuitry on the front panel board is powered by the main 5V rail after the supply is turned on by the front panel microcontroller.

The standby power also supplies a small portion of the motherboard circuitry. When the motherboard detects that the power switch has been pressed, it will assert a signal to the microcontroller (via the power distribution board) that tells the front panel microcontroller to turn the main rails of the power supply on or off. After the system’s main rails have been powered up, the front panel microcontroller is then free to turn on front panel LED’s scan the keypad, and drive control signals to the inverter that cause the display to dim or turn on/off.

The logic analyzer application communicates with the front panel by sending commands to the acquisition microcontroller, via the 1394 bus, which are then transmitted serially by the acquisition microcontroller to the front panel microcontroller. Data is transmitted in the reverse order when the application is polling the front panel.

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Agilent Technologies 1690, 1680 manual Power Distribution Board, Front Panel Board, 165

Contents

Agilent Technologies 1680/90-Series Logic Analyzer Agilent 1680/90-Series Logic Analyzer-At a Glance Features Service Strategy This Book Contents To test the multiple-clock state acquisition Troubleshooting Theory of Operation General Information Accessories Supplied Agilent Part Number Accessories Characteristics SpecificationsFull Channel Channel Count Probes Dimensions Equipment Required Recommended Test Equipment Preparing for Use To inspect the logic analyzer Power Requirements To connect the 1690A,AD-series logic analyzer to a host PC To apply power To clean the logic analyzer To start the user interfaceTo test the logic analyzer Testing Performance Test Interval To make the test connectors Materials Required DescriptionQty To make the test connectors Set up the test equipment To set up the test equipment and the logic analyzerEquipment Required Critical Specifications Pulse Generator Setup Timebase Channel Trigger Set up the 1680A,AD-series logic analyzer Oscilloscope Setup Acquisition Display Trigger Shift ∆ TimeChannel Define meas To perform the logic analyzer self-tests Set up the 1690A,AD-series logic analyzer Set the reporting level Click Close to close the Analysis System Self Tests dialog To test the threshold accuracy Set up the equipment Connect and configure the logic analyzer Test the ECL Threshold Test the 0 V User Threshold Test the next pod To set up the logic analyzer for the state mode tests To set up the logic analyzer for the state mode tests Click OK to close the Value dialog To set up the logic analyzer for the state mode tests To test the single-clock, single-edge, state acquisition Channel 1 Output Combinations Channel 2 Output Combination Channel 2 Output Verify the test signal Setup/Hold Combinations Test Sample Position Times Window Check the setup/hold combination To test the single-clock, single-edge, state acquisition Following clock configurations will be used in steps 4, 5, To test the single-clock, single-edge, state acquisition Following clock configurations will be used in steps 9, 10 To test the single-clock, single-edge, state acquisition Test the next channels 1680/81A,AD and 1690/91A,AD To test the multiple-clock state acquisition 1680A, AD or 1690A, AD only 1682A, AD or 1692A, AD only Verify the test signal 2.0 ns 4.50 ns +3.0 ns To test the multiple-clock state acquisition To test the multiple-clock state acquisition Enable the pulse generator channel 1 Comp with the LED on Test the next channels 1680/81A, AD and 1690/91A, AD To test the single-clock, multiple-edge, state acquisition Modify the following pulse generator settings 1680A,AD or 1690A,AD only Pod 2, channel 1682A,AD or 1692A,AD only Pod 1, channel Verify the test signal Check the setup/hold with single clock, multiple clock edges To test the single-clock, multiple-edge, state acquisition Following clock configurations will be used in steps 3, 4, To test the single-clock, multiple-edge, state acquisition Test the next channels 1680/81A,AD and 1690/91A,AD To test the time interval accuracy Function Generator Setup To test the time interval accuracy Click the Run icon to fill acquisition memory Acquire and verify the test data To test the time interval accuracy Performance Test Record Test Settings Results Self-TestsThreshold Accuracy Performance Test Record Settings Results Edge AcquisitionMultiple-Clock Multiple-Edge Acquisition Time Interval Performance Test Record Settings Results Single-Clock Performance Test Record Calibrating and Adjusting Logic analyzer calibration Troubleshooting To install the fan guard To use the flowcharts Start Troubleshooting the Agilent 1680A,AD-series Replace Power supply Are both instrument Yes Possible problem with LCD display, inverter, or cables Does the blue Uninstall, then reinstall Agilent Logic Analyzer application Possible problem with To test the power supply voltages To check the power-up tests Pin Voltage Power Supply Voltages To test the LCD display signals To test disk drive voltages Equipment Required Critical Specification Disk Drive Voltages Pin No Signal To verify the CD-ROM Disk Drive Voltages Pin Signals Pin No To reinstall the operating system To recover the operating system Problems with the Operating System Troubleshooting the Agilent 1690A,AD-series Yes Is the power cord Connected? Consult host PC Test pass? Task Manager To verify connectivity 100 Device Manager 101 102 General Troubleshooting To run the self-tests103 104 105 106 Acquisition board status LEDs 107 To test the logic analyzer probe cables 108 109 110 To check the BNC Trigger input/output signals 111 On the DC source, enter a voltage setting of 3.000 Digital Multimeter To test the auxiliary power005% accuracy 112 113 Replacing Assemblies Prepare the instrument for disassembly 1680A,AD-series disassembly/assemblyTo remove the chassis from the sleeve 114 115 To remove the acquisition board 116 117 To remove the power supply 118 To remove the hard disk drive 119 To remove the CD-ROM drive assembly 120 To remove the flexible disk drive 121 122 To remove the PCI boards 123 To remove the motherboard 124 Transfer the I/O panel to the replacement board 125 126 To remove the front panel assembly 127 Reverse this procedure to install the front panel assembly 128 To disassemble the front panel assembly 129 To remove the distribution board 130 To remove the inverter board 131 To remove the fans 132 To remove the cable tray 133 1690A,AD-series disassembly/assembly 134 To remove the fascia 135 Remove the fascia away from the front panel 136 137 To remove the deck 138 139 140 To remove the line filter 141 To remove the front panel and front frame 142 143 Replaceable Parts 144 Replaceable Parts Ordering Replaceable Parts List See Also145 Exploded View Replaceable Parts Ref. Des Agilent 1680A,AD-Series Replaceable PartsExchange Assemblies 147 148 0515-0372 149 150 151 Front Panel Assembly 152 Exploded View 154 Agilent 1690A,AD-Series Replaceable Parts 155 156 157 Power Cables and Plug Configurations Plug Type Cable Plug Description Length Color Country In/cm 158 159 Theory of Operation Block-Level Theory Agilent 1680A,AD-Series Logic Analyzer Block Diagram 160 161 Agilent 1680A,AD-series Logic Analyzer Theory Logic Acquisition Board Block Diagram Power SupplyAcquisition Board 162 163 164 Power Distribution Board Front Panel Board165 166 Agilent 1690A,AD-series Logic Analyzer Theory Self-Tests Descriptions Power-up Self-Tests 1680A,AD-seriesConnectivity Tests 1690A,AD-series 167 168 Acquisition Board Self Tests 169 Logic Analyzer Self-Tests 170 171 172 Manual Part Number Technology Licenses