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Repair Guide

110

Keysight 8990B Service Guide

Figure 4-26

Disconnect the cable from the back of the breakaway board

To remove the Autoprobe board, remove the two screws with the T10 torx

screwdriver and then slide the board to the right to disengage the two latches

on either side of the board as shown in

Figure 4-27

Figure 4-27

Remove the Autoprobe board

Disconnect this

cable

The

other

latch

Remove these

two screws

Once the screws

are removed,

disengage this

latch and the on

the other side to

lift up and

remove the board

Содержание 8990B

Страница 1: ...Keysight 8990B Peak Power Analyzer Service Guide ...

Страница 2: ...herwise provide the govern ment rights in excess of these rights customarily provided to the public to use modify reproduce release per form display or disclose commercial computer software or commercial com puter software documentation No additional government requirements beyond those set forth in the EULA shall apply except to the extent that those terms rights or licenses are explicitly requir...

Страница 3: ...or for incidental or consequential damages in connection with the furnishing use or performance of this document or any information contained herein Should Keysight and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control Duration and conditions of warranty for...

Страница 4: ...damage that occurs as a result of the Buyer s circuit or any defects that result from Buyer supplied products To the extent allowed by local law Keysight makes no other warranty expressed or implied whether written or oral with respect to this product and specifically disclaims any implied warranty or condition of merchantability fitness for a particular purpose or satisfactory quality Exclusive R...

Страница 5: ...cture and intended use of the instrument Keysight Technologies assumes no liability for the customer s failure to comply with these requirements Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument Caution risk of danger refer to this manual for specific Warning or Caution information A...

Страница 6: ...oval of covers and shields are for use by service trained personnel only Do not service or adjust alone Under certain conditions dangerous voltages may exist even with the instrument switched off To avoid electrical shock service personnel must not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present Do not operate damaged instrum...

Страница 7: ...pareil ISM est conforme a la norme NMB 001 du Canada This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste The CSA mark is a registered trademark of the Canadian Standards Association This symbol indicates the time period during which no hazardo...

Страница 8: ...trol Instrument product The affixed product label is as shown below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight Service Center or visit http about keysight com en companyinfo environment takeback shtml for more information Sales and Technical Support To contact Keysight for sales and technical support refer to the support links on the...

Страница 9: ...onic Equipment WEEE Directive 8 Product category 8 Sales and Technical Support 8 1 Performance Verification and Adjustments Introduction 20 Equipment List 21 Performance Verification 23 Zero set verification 23 System accuracy verification 24 Procedure 25 Rise and fall time verification 31 Timebase frequency accuracy verification 34 Impedance verification 35 Offset accuracy verification 38 DC gain...

Страница 10: ...7 Check Source Assembly 58 Filter and Clock Distribution Board 58 Test Acquisition Board 58 PC Motherboard 59 Power Supply Assembly 59 Monitor Assembly 59 Front Panel 60 Hard Disk Drive 60 Display Board 61 System Fans 61 3 Troubleshooting Guide Introduction 64 Power Up Failure 64 Instrument Self Test 65 Performance Verification 66 Display Trouble Isolation 67 Check the backlight inverter voltages ...

Страница 11: ...nd support plate sub assembly 81 Replacement Parts 82 Tools Required 95 Remove and Replace the Handle and Rear Cover 97 Front Panel Disassembly 100 Disassembly 116 Check Source Board Module Disassembly 132 Remove and Replace the Power Supply and PC Motherboard 135 Remove and Replace the Acquisition Board Assembly 146 5 Contacting Keysight Introduction 152 Contacting Keysight 152 Before Calling Key...

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Страница 13: ...ight inverter voltages 67 Figure 4 1 Overview assembly of the 8990B 75 Figure 4 2 Front panel assembly 76 Figure 4 3 Air duct sub assembly 77 Figure 4 4 PC motherboard sub assembly 78 Figure 4 5 Rear mounting plate sub assembly 79 Figure 4 6 Cabinet sub assembly 80 Figure 4 7 8990B module and support plate sub assembly 81 Figure 4 8 Remove the T20 screws at the handle 97 Figure 4 9 Remove the T20 ...

Страница 14: ...place the backlight inverter board 114 Figure 4 32 Replace the touchscreen controller board 115 Figure 4 33 Remove the top cover 116 Figure 4 34 Cable connections at the BNC connector base 117 Figure 4 35 Remove the MMCX cables 118 Figure 4 36 Remove the pin cables 119 Figure 4 37 Disconnect the semi rigid cable and remove the calibration cable assembly 120 Figure 4 38 Remove the sensor flex and c...

Страница 15: ...the CPU fan assembly 138 Figure 4 59 Remove the PC motherboard 139 Figure 4 60 Uninstall the power supply deck assembly 140 Figure 4 61 Uninstall the power supply deck assembly 141 Figure 4 62 Power supply deck assembly with the power supply mod ule and PC motherboard 142 Figure 4 63 Unscrew the screws and slot out the PSU 143 Figure 4 64 Remove the power cables connected to the power supply modul...

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Страница 17: ...g 65 Table 3 3 Performance verification troubleshooting 66 Table 3 4 Backlight inverter board input voltages 68 Table 3 5 Communication interface failure troubleshooting 70 Table 4 1 Front panel assembly 76 Table 4 2 Air duct sub assembly 77 Table 4 3 PC motherboard sub assembly 78 Table 4 4 Rear mounting plate sub assembly 79 Table 4 5 Cabinet sub assembly 80 Table 4 6 8990B module and support pl...

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Страница 19: ... Performance Verification and Adjustments Introduction 20 Equipment List 21 Performance Verification 23 Adjustments 51 The performance verification procedures described in this chapter verify that the 8990B is operating within its published specifications ...

Страница 20: ...erification is used for incoming inspection the calibration cycle also called periodic maintenance or after repairs have been made The following performance verifications are described in this chapter Zero set verification System accuracy verification Rise and fall time verification Timebase frequency accuracy verification Impedance verification Offset accuracy verification DC gain verification Ma...

Страница 21: ...Symmetricom 58503B Digital multimeter Measure resistance 4 wire at better than 0 1 accuracy DC voltage measurement accuracy better than 0 1 of reading 34410A 3458A DC power supply Output voltage 100 V maximum Output current 0 5 A maximum 6614C Power splitter Two resistor type power splitter N type f Maximum frequency 18 GHz 11667A Power meter Compatible with E Series power sensor Absolute accuracy...

Страница 22: ...1903D BNC cable 50 Ω characteristic impedance 10503A Trigger cable 50 Ω characteristic impedance BNC m to SMB f U2032A BNC tee adapter BNC Tee m f f 50 Ω characteristic impedance 1250 0781 BNC to dual banana adapters BNC f to dual banana m 1251 2277 Table 1 1 Equipment list continued Equipment Critical specification Recommended model number part number ...

Страница 23: ...ystem level verification which requires the N1923 4A wideband power sensor Required test equipment 1 unit of N1923 4A wideband power sensor System specification 200 nW frequency 500 MHz 550 nW frequency 500 MHz Test procedure 1 Turn on the 8990B 2 Connect the N1923 4A to the 8990B as shown in Figure 1 1 Figure 1 1 Zero set verification setup 3 Allow the system to warm up for approximately an hour ...

Страница 24: ... 51 13 Set the 8990B RF input channel 1 frequency to 50 MHz 14 Select 50 MHz CW on the 8990B to turn on the check source 15 Repeat step 7 to step 11 16 If the calculated zero set value is out of specification 550 nW refer to Adjustments on page 51 17 Repeat step 7 to step 16 for the RF input channel 4 System accuracy verification The purpose of this verification is to verify the accuracy of the 89...

Страница 25: ...s a combination of errors for linearity calibration factor and temperature compensation The maximum input power to the 11667A splitter is 0 5 W or 27 dBm To set the sensor mode Average Normal mode send the SENS DET FUNC AVER NORM command Use with Power sensor and Power meter To set the sensor video bandwidth send the SENS BAND VID OFF command use with Power sensor and Power meter To set the sensor...

Страница 26: ...F output 5 Set the frequency of the power meter s channels A and B to the same frequency as the signal generator 6 Measure the standard power PSTD of channel A and the incident power PINC1 of channel B Compute and record the power ratio Pratio of these channels for the current frequency and power level based on the following equation 7 Repeat steps 4 to 6 for other frequencies with the same power ...

Страница 27: ...g equations 15 Repeat steps 12 to 14 for other frequencies with the same power level 16 Compare the computed accuracy errors to the calibration uncertainty values in the data sheet at https literature cdn keysight com litweb pdf 5990 8126EN pdf id 205092 If the verification fails return the 8990B to Keysight 17 Repeat steps 4 to 16 by sweeping through the power levels from 25 dBm to 10 dBm Level t...

Страница 28: ...sured in this verification includes a combination of errors for linearity calibration factor and temperature compensation The maximum power is 20 dBm The frequency range of the DUT may be wider than the coupler selected in the test More than one coupler may be required to cover the frequency range of the DUT The procedure below is only applicable for limited verification For full verification you ...

Страница 29: ...of channel B Compute and record the coupling factor Pcpl of these channels for the current frequency based on the following equation 8 Repeat steps 4 to 6 for other frequencies with the same power level 9 Turn off the RF output of the signal generator 10 Remove the standard sensor from the test port 11 Replace it with the 8990B and N1923A N1924A power sensor which is the device under test DUT 12 Z...

Страница 30: ...the data sheet at https literature cdn keysight com litweb pdf 5990 8126EN pdf id 205092 If the verification fails return the 8990B to Keysight 18 Repeat steps 13 to 17 by sweeping through the power levels from 10 dBm to 20 dBm Level the power manually if necessary with reference to the incident sensor use the following equation Test port power PINC2 Pcpl ...

Страница 31: ...alidating the rise and fall time with the N1923 4A using an actual RF pulse Required test equipment 1 unit of E8257D signal generator 1 unit of 33334EZ diode detector 1 unit of oscilloscope with bandwidth 500 MHz 1 unit of U2032A trigger cable 1 unit of N1923 4A wideband power sensor DUT System specifications Rise fall time 5 5 ns error Refer to Figure 1 4 Overshoot 0 5 Figure 1 4 Measured rise ti...

Страница 32: ...7D with the following recommended signal profile Frequency 1 GHz Power level 10 dBm Pulse period 10 μs Duty cycle 50 The pulse signal is characterized using a diode detector which feeds to the oscilloscope This is to verify that the rise fall time of the RF pulse measured by the oscilloscope is 5 ns and the overshoot is 0 5 Figure 1 5 Screenshot of the measurement reading from the oscilloscope 4 C...

Страница 33: ...um display 7 Turn off the video bandwidth on the 8990B 8 Measure and record the rise fall time of the pulse signal from the 8990B into Table 1 2 9 Repeat step 3 to step 8 for the pulse signal with different pulse periods and different video bandwidth settings Record all the readings into Table 1 2 10 Compare the recorded readings to the specifications as listed in Table 1 2 If the test fails refer...

Страница 34: ...icom 58503B 10 MHz frequency reference source 2 units of 1053A BNC cable System specification 1 4 ppm Test procedure 1 Turn on the 8990B and 53132A 2 Allow the system to warm up for approximately an hour 3 Connect the 8990B to the PC via USB interface 4 The test equipment setup is as shown in Figure 1 7 Table 1 2 Test record for rise fall time verification Measured points Specification Measured ri...

Страница 35: ... connector using the 53132A Impedance verification The impedance verification checks the input impedance of the vertical inputs A four wire measurement is used to accurately measure the 50 Ω and 1 MΩ inputs Required test equipment 1 unit of 34410A digital multimeter 2 units of 10503A BNC cable 1 unit of BNC tee adapter 1250 0781 2 units of BNC to dual banana adapter 1251 2277 8990B Symmetricom 585...

Страница 36: ...ment 4 Assemble the two units of BNC to dual banana adapter and two units of BNC cable as follows Connect one end of each of the BNC cables to the BNC to dual banana adapters Connect both the BNC to dual banana adapters to the four wire resistance connections on the multimeter Connect the other end of each of the BNC cables to the BNC tee adapter 5 Connect the male end of the BNC tee adapter to th...

Страница 37: ...3 11 Repeat step 4 to step 10 for the rest of the vertical scale setting in Table 1 3 12 Repeat step 4 to step 11 with the input impedance set to 1 MΩ and verify the resistance reading with 1 MΩ 10 kΩ 13 Repeat step 4 to step 12 for the video input channel 3 of the 8990B 14 Compare the recorded values with the specification values as listed in Table 1 3 If the test fails refer to Adjustments on pa...

Страница 38: ...upply 1 unit of BNC tee adapter 1250 0781 2 units of BNC to dual banana adapter 1251 2277 50 Ω 0 05 V div 48 75 Ω to 51 25 Ω 50 Ω 0 1 V div 48 75 Ω to 51 25 Ω 50 Ω 0 2 V div 48 75 Ω to 51 25 Ω 50 Ω 0 5 V div 48 75 Ω to 51 25 Ω 50 Ω 1 V div 990 kΩ to 1 010 MΩ 1 MΩ 0 01 V div 990 kΩ to 1 010 MΩ 1 MΩ 0 02 V div 990 kΩ to 1 010 MΩ 1 MΩ 0 05 V div 990 kΩ to 1 010 MΩ 1 MΩ 0 1 V div 990 kΩ to 1 010 MΩ 1 ...

Страница 39: ...set the video average count to 256 on channel 2 The video averaging will be displayed on the Status view 5 Set the input impedance for the video input channel 2 to 50 Ω 6 Set the vertical scale for the video input channel 2 to 10 mV div 7 Press Clear Display and wait for the average count to reach 256 8 Record the mean value of the average reading in Vzero error in Table 1 4 9 Repeat step 6 to ste...

Страница 40: ... set the average count to 256 5 Set the input impedance for the video input channel 2 to 50 Ω 6 Set the vertical scale for the video input channel 2 to 10 mV div 7 Set the video input channel 2 offset to 120 mV 8 Set the DC power supply to output 120 mV as shown in Table 1 4 9 Press Clear Display and wait for the average count to reach 256 10 Record the voltage reading at the digital multimeter in...

Страница 41: ...o 1 MΩ 15 Repeat step 3 to step 14 for video input channel 3 Table 1 4 Test record for offset accuracy verification Vertical scale V div Output voltage VDMM Vscope Verror VDMM Vscope Verror Vzero error Vzero error limit Video input channel 2 50 Ω 0 01 120 mV 1 8 mV 0 02 240 mV 2 6 mV 0 05 600 mV 5 0 mV 0 1 1 2 V 9 0 mV 0 2 2 4 V 17 0 mV 0 5 4 0 V 41 0 mV 1 4 0 V 81 0 mV Video input channel 2 1 MΩ ...

Страница 42: ...17 0 mV 0 5 4 0 V 41 0 mV 1 4 0 V 81 0 mV Video input channel 3 1 MΩ 0 01 5 V 1 8 mV 0 02 10 V 2 6 mV 0 05 10 V 5 0 mV 0 1 20 V 9 0 mV 0 2 20 V 17 0 mV 0 5 20 V 41 0 mV 1 100 V 81 0 mV 2 100 V 161 0 mV 5 100 V 401 0 mV Table 1 4 Test record for offset accuracy verification continued Vertical scale V div Output voltage VDMM Vscope Verror VDMM Vscope Verror Vzero error Vzero error limit ...

Страница 43: ...red by a digital multimeter The comparison between the two voltages is performed regardless of the 8990B offset error and ground reference Required test equipment 1 unit of 34401A 3458A digital multimeter 2 units of 10503A BNC cable 1 unit of 6614C DC power supply 1 unit of BNC tee adapter 1250 0781 2 units of BNC to dual banana adapter 1251 2277 System specification DC gain accuracy 2 of the full...

Страница 44: ...in Table 1 5 6 Set the input impedance for the video input channel 2 to 50 Ω 7 Set the vertical scale for the video input channel 2 to 10 mV div 8 Press Clear Display and wait for the average count to reach 256 9 Record the voltage reading at the digital multimeter in VDMM and VDMM respectively in Table 1 5 10 Record the mean value of the average reading at the 8990B in Vscope and Vscope respectiv...

Страница 45: ...ustments on page 51 DC Gain Error Vout D Vin D Vscope Vscope VDMM VDMM 1 0 75 Table 1 5 Test record for DC gain verification Vertical scale Output voltage VDMM VDMM Vscope Vscope DC gain error DC gain error limit Video input channel 2 50 Ω 10 mV div 30 mV 2 20 mV div 60 mV 2 50 mV div 150 mV 2 100 mV div 300 mV 2 200 mV div 600 mV 2 500 mV div 1 5 V 2 1 V div 3 0 V 2 Video input channel 2 1 MΩ 10 ...

Страница 46: ...ment 1 unit of E8257D Option 520 signal generator 1 unit of 11667A power splitter Video input channel 3 50 Ω 10 mV div 30 mV 2 20 mV div 60 mV 2 50 mV div 150 mV 2 100 mV div 300 mV 2 200 mV div 600 mV 2 500 mV div 1 5 V 2 1 V div 3 0 V 2 Video input channel 3 1 MΩ 10 mV div 30 mV 2 20 mV div 60 mV 2 50 mV div 150 mV 2 100 mV div 300 mV 2 200 mV div 600 mV 2 500 mV div 1 5 V 2 1 V div 3 0 V 2 2 V ...

Страница 47: ...ure 1 Assemble the test equipment as shown in Figure 1 11 Figure 1 11 Maximum frequency verification setup 2 Allow the system to warm up for approximately an hour 3 Preset the power meter 4 Perform zeroing and calibration for the power sensor 5 Set the power meter to display the measurement in Watts 6 Press Default Setup on the 8990B to set the 8990B to its default settings and turn on video input...

Страница 48: ...nal generator 12 Measure the input power at video input channel 2 of the 8990B and convert the value to rms voltage using the following equation 13 Record the calculated RMS voltage Vin 50 MHz in Table 1 7 Table 1 6 Signal generator settings Vertical scale RF signal amplitude signal source RF signal amplitude signal source RF signal amplitude power meter and 8990B 5 mV div 0 02 Vpp 24 dBm 30 dBm 1...

Страница 49: ...ge using the following equation 20 Record the calculated RMS voltage in Table 1 7 Vin max freq 21 Press Clear Display and record the Vrms reading Vout max freq 22 Calculate the gain of the maximum analog bandwidth using the following equation and record the value in Table 1 7 23 Repeat step 8 to step 22 for the rest of the vertical scale setting in Table 1 7 24 Repeat step 8 to step 23 for video i...

Страница 50: ...equency verification Vertical scale Vin 50 MHz Vout 50 MHz Gain50 MHz Vin max freq Vout max freq GainMax freq Video input channel 2 5 mV div 10 mV div 20 mV div 50 mV div 100 mV div 200 mV div 500 mV div 1 V div Video input channel 3 5 mV div 10 mV div 20 mV div 50 mV div 100 mV div 200 mV div 500 mV div 1 V div ...

Страница 51: ... out of specification Performance verifications must be performed after any repairs that may have altered the characteristics of the 8990B Contact your local Keysight service center to perform adjustment on the 8990B For more information you can contact your local Keysight representative at the telephone numbers listed in Contacting Keysight on page 151 or at the Web address below www keysight com...

Страница 52: ...1 Performance Verification and Adjustments 52 Keysight 8990B Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 53: ...in Board Assembly 56 DAP Assembly 57 Check Source Assembly 58 Filter and Clock Distribution Board 58 Test Acquisition Board 58 PC Motherboard 59 Power Supply Assembly 59 Monitor Assembly 59 Front Panel 60 Hard Disk Drive 60 Display Board 61 System Fans 61 This chapter describes how each of the peak power analyzer s individual assemblies operate ...

Страница 54: ...f up to 5 ns The 8990B has a high sampling rate of 100 MSa s for RF channels This enables the peak power analyzer to offer faster measurement speed and greater measurement accuracy in key applications such as radar pulse analysis and wireless pulse measurement The peak power analyzer is also able to perform auto zeroing and calibration function to eliminate the need to connect and disconnect from ...

Страница 55: ...s the main processor and memory for the peak power analyzer Stores the peak power analyzer firmware in flash Stores the serial number of the peak power analyzer Inputs Power supplies from PSU via main board Control and data lines from main board and DAP Outputs Control address and data lines to main board and DAP ...

Страница 56: ...d Assembly Purpose Provides the peak measurement path to the DAP Provides the external trigger input or output Provides the signal routing between the PPMC and DAP Inputs Power supplies from PSU Control address and data lines from PPMC Outputs Control and data lines to PPMC ...

Страница 57: ...quisition and processing for the peak measurement path Inputs Power supplies from PSU via main board Control address and data lines from PPMC Outputs Processed peak path measurement data to PPMC via main board Control and data lines to PPMC via main board Trigger output to external equipment ...

Страница 58: ...forms filtering function when the 8990B is used with a sensor at a low frequency RF signal Test Acquisition Board The test acquisition board contains the TUT modules onboard ADC clock distribution data management ASICs external acquisition memory ADC communication and programming FPGA and supporting power supply circuitry The main function of this board is as follows Provide scope measurement func...

Страница 59: ...RAM keyboard and mouse interfaces serial and parallel interfaces hard disk drive interface and PCIE buses Power Supply Assembly AC input to the power supply 100 VAC to 240 VAC 10 Maximum input power 375 W AC input frequency 50 Hz to 60 Hz Monitor Assembly The Flat Panel Display FPD monitor is a thin film liquid crystal touch screen display TFT LCD This FPD is a 15 inch diagonal 1024 by 768 pixel X...

Страница 60: ...peripherals A conductive element on the inside of each key shorts a gap on the underlying keyboard circuit board The keyboard controller detects this short and sends the proper keypress information to the system controller on the motherboard There are 12 knobs located on the front panel Hard Disk Drive The hard disk drive is a high capacity and shock resistant unit It is used to store the peak pow...

Страница 61: ...erential Signal LVDS signals that drive the monitor System Fans The system fans consists of six fans There are two large fans that draw air out of the rear of the instrument two medium fans that are positioned over each ADC to give additional cooling one small fan positioned over the trigger IC and another small fan installed on the backplane main board to give additional cooling The fans are all ...

Страница 62: ...2 Theory of Operation 62 Keysight 8990B Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 63: ...Up Failure 64 Instrument Self Test 65 Performance Verification 66 Display Trouble Isolation 67 Communication Interface Failure 70 Check Source Failure 70 Setup the BIOS 71 Display the Software and Firmware Revision 72 This chapter provides the troubleshooting information for the peak power analyzer ...

Страница 64: ... that the Power On Off switch lights up Ensure that the main power source is live Check the main cable for any obvious damage Replace the main power cable Power supply module high probability Mainboard low probability Basic internal check Ensure that the green LED DS 14 on the DAP board light up when the power button is pressed Ensure that the green LED DS4 on the main board light up when the powe...

Страница 65: ...connectivity between the scope acquisition board DAP filter board and DAP board Unplug and plug back the cable connection between the acquisition board and DAP filter board DAP filter board high probability Test acquisition board 1 GHz or DAP board low probability Channel 1 measurement path test Ensures that the measurement path of channel 1 is working Replace the DAP board DAP assembly high proba...

Страница 66: ...tip Possible faults Zero set failure Main board System accuracy failure Replace the DAP board DAP assembly high probability Main board low probability Rise fall time failure Unplug and plug back the sensor flex RF connections Main board high probability Sensor flex low probability DAP assembly low probability Time base frequency accuracy failure Check that the BNC cable used is not damaged Check t...

Страница 67: ...ut voltage is approximately 300 to 450 Vrms 40 kHz measured differentially between the two wires when the backlight is illuminated The voltage is approximately 1 kV before the backlight tube is illuminated A red LED on the backlight inverter board illuminates when the output voltage is present When the backlight goes off when the peak power analyzer s operating system switches to screen saver mode...

Страница 68: ...Keysight 8990B Service Guide Table 3 4 Backlight inverter board input voltages Backlight inverter board input voltages Input pin 7 6 5 4 3 2 1 Backlight OFF 0 V 0 V 0 V 0 V 0 V 0 V 0 V Backlight ON 5 V 0 V 2 5 V 0 V 0 V 12 V 12 V ...

Страница 69: ... to the touchscreen controller board and LCD Front panel display working Check the inverter board control cable Check the voltage on pin 1 of J3 on the touchscreen controller board The voltage should be 12 V Try with a new touchscreen controller board Replace the touchscreen controller board The voltage is 12 V Replace the touchscreen controller board Replace the LCD Front panel display working Re...

Страница 70: ...rce of the peak power analyzer is not functioning are as follows Check source board high probability Main board low probability Table 3 5 Communication interface failure troubleshooting Type of communication Debug tip Possible fault LAN Ensure that the connector is not damaged PPMC assembly USB 2 0 Ensure that the connector is not damaged PPMC assembly ...

Страница 71: ...panel 4 Press Delete when you see the following message at the bottom of the screen Press TAB to show POST screen DEL to enter SETUP F12 to select boot drive Use the following procedure to configure the motherboard BIOS parameters 1 Select Exit and press Enter 2 Select either Optimal Defaults or Fail safe default and press Enter 3 Press OK to perform the selection 4 Select Save and Exit Setup to s...

Страница 72: ...e Display the Software and Firmware Revision Use the following procedure to display the current software and firmware revision in the 8990B 1 Select Support About on the toolbar 2 The About dialog is displayed with the current software revision information ...

Страница 73: ...Replace the Handle and Rear Cover 97 Front Panel Disassembly 100 Disassembly 116 Check Source Board Module Disassembly 132 Remove and Replace the Power Supply and PC Motherboard 135 Remove and Replace the Acquisition Board Assembly 146 This chapter contains information on repair and replaceable parts of the 8990B This chapter also explains how to disassemble the 8990B ...

Страница 74: ...s and assemblies which can be ordered from Keysight It also describes how to assemble and disassemble the peak power analyzer for repair To order the replaceable parts contact your local Keysight Sales and Service Office To return your peak power analyzer for servicing at a qualified service center refer to Chapter 5 Contacting Keysight ...

Страница 75: ...ain Replacement Parts for 8990B Figure 4 1 Overview assembly of the 8990B Cabinet assembly Rear mounting plate sub assembly Air duct sub assembly Front panel sub assembly Processor power supply sub assembly 8990B module and support plate sub assembly ...

Страница 76: ...uantity Description 1 08990 00100 1 8990B front deck 2 54904 66403 08990 60069 1 PCA Autoprobe PCA Front panel without USB 3 08990 40200 08990 40201 1 Bezel Option U01 Bezel without USB host Option U02 4 54913 47402 5 18 mm knob Flint gray 5 54913 47401 7 12 mm knob Flint gray 6 54904 66405 1 PCA front panel 7 54904 68708 1 Display touchscreen support assembly ...

Страница 77: ...ice Guide 77 Air duct sub assembly Figure 4 3 Air duct sub assembly 1 2 3 Table 4 2 Air duct sub assembly No Part number Quantity Description 1 54904 68502 2 80 mm fan assembly 2 54904 68503 1 60 mm fan assembly 3 54904 44102 1 Air duct ...

Страница 78: ...ble 4 3 PC motherboard sub assembly No Part number Quantity Description 1 0960 2939 1 Motherboard Flex ATX Core 2 Duo 4 GB with inverted backlight enable 2 08990 60205 1 8990B power supply deck assembly 3 0950 5060 1 Power supply module 700 Watt 12 V with one output 4 3160 4331 1 CPU fan assembly with socket 12 VDC 5000 RPM ...

Страница 79: ...re 4 5 Rear mounting plate sub assembly 1 2 3 4 Table 4 4 Rear mounting plate sub assembly No Part number Quantity Description 1 08990 68707 1 8990B hard drive replacement kit 2 54904 00107 1 Standard hard disk plate 3 08990 00105 1 8990B rear mounting deck 4 54904 68501 2 Fan assembly ...

Страница 80: ...ght 8990B Service Guide Cabinet sub assembly Figure 4 6 Cabinet sub assembly 1 2 3 Table 4 5 Cabinet sub assembly No Part number Quantity Description 1 54904 44901 1 Handle 2 54904 44902 1 Handle keeper 3 08990 44402 1 Bucket ...

Страница 81: ...d checking source board for SPO 2 1 08990 00601 1 Shield can bottom 3 08990 66005 1 Tested PPMC with 8990B firmware for SPO 4 08990 68501 1 Sanyo Denki fan 5 08990 66002 1 Tested backplane motherboard for SPO 6 1 08990 00600 1 Shield can top 7 08990 66003 1 Tested filter and clock distribution board for SPO 8 08990 60067 1 Channel A adapter board 9 08990 60068 1 Channel B adapter board 10 08990 66...

Страница 82: ...lacement Parts Table 4 7 Replacement parts Part number Description Item 08990 00109 8990B N type CON cover 08990 84300 Label ID 8990B 08990 94301 Label Control panel 08990 94303 Label PC IO option U01 08990 94302 Label PC IO without USB host Option U02 ...

Страница 83: ...sight 8990B Service Guide 83 08990 84302 Label Probe comp 08990 84303 Label Check source 08990 84304 Label Port 1 08990 84305 Label Port 2 08990 84306 Label Port 3 Table 4 7 Replacement parts Part number Description Item ...

Страница 84: ...ht 8990B Service Guide 08990 84307 Label Port 4 54913 94300 Label Colored knob set 08990 41900 Switch Control Panel 08990 61615 PSU to AC inlet 08990 44700 Filler plate Table 4 7 Replacement parts Part number Description Item ...

Страница 85: ...0 62300 Storage pouch 08990 00101 8990B acquisition deck 54574 09101 Spring Tilt leg 1520 0702 Fan mount break away 83 5 mm LG 0 8 1 6 mm THK silicone rubber 08990 25000 Stand off HEX male female Table 4 7 Replacement parts Part number Description Item ...

Страница 86: ...ide 08990 61606 N type connector semi rigid cable 08990 61603 Sensor cable ODU 08990 00108 8990B cable cover N1911 61003 Calibrator cable assembly 08990 61600 Cable from PSU to motherboard Table 4 7 Replacement parts Part number Description Item ...

Страница 87: ...608 MMCX male right angle cable 08990 61613 Cable 2 pin 08990 61616 MMCX male straight right angle cable 5190 3462 RF cable assembly SMB F SMB F length is 80 without marker 08990 61601 Power ATX cable Table 4 7 Replacement parts Part number Description Item ...

Страница 88: ...61614 Cable standby ON OFF 08990 61625 Cable display inverter USB 08990 44101 Cover Front 08990 61604 USB cable mini USB to 10 pin receptacles 08990 61607 BNC cable 10 MHz Out scope to filter board Table 4 7 Replacement parts Part number Description Item ...

Страница 89: ... board to 8990B 10 MHz Out 08990 61611 BNC cable Trig In PM to DAP board 08990 61618 BNC cable Trig In scope to filter board 08990 61619 BNC cable Trig Out scope to filter board 08990 61620 BNC cable Trig Out PM to DAP board Table 4 7 Replacement parts Part number Description Item ...

Страница 90: ...990B Service Guide 54901 66501 Test acquisition board 1 GHz 54904 43901 Shaft Power switch 54904 43201 Thermal pad 54904 01202 Heat spreader 54904 01203 Heat spreader Bottom Table 4 7 Replacement parts Part number Description Item ...

Страница 91: ...uide 91 54904 01201 Bracket Removable hard disk 54904 04101 Plate Removable hard disk 54904 41202 Clamp SATA 54904 94317 Label Removable hard disk tray 54904 00108 Bracket Power supply Table 4 7 Replacement parts Part number Description Item ...

Страница 92: ...92 Keysight 8990B Service Guide 7144 0709 Rear panel I O shield 54904 44001 Rubber foot set 54904 41001 Tilt leg 54904 42202 Keybox 54904 61606 Cable USB device Table 4 7 Replacement parts Part number Description Item ...

Страница 93: ... 93 54904 61612 Cable Bulk power 54904 61609 Cable Front panel power 54904 61614 Cable Hard disk power 1400 3411 Saddle wire side entry 0 22 IN 0960 2796 Touchscreen controller board 5V DC Table 4 7 Replacement parts Part number Description Item ...

Страница 94: ...r DC to AC 4 Watt 2 output 1420 0394 Battery 3 V 1 A HR Lithium Manganese Dioxide Table 4 7 Replacement parts Part number Description Item NOTE The replacement parts are not trade parts and can only be ordered through the Keysight Service Center for repair purposes ...

Страница 95: ...dule 0950 5060 9 32 socket 5 in lbs for earth wire Attach the earth wires nut Manual T10 Torx screwdriver Fix the screw on the top cover and attach the PCA Philips 12 in lbs power driver Fit the screws on the power supply module red and black wires Philips 5 in lbs power driver Fit the screws on the CPU fan Customized socket for power reference connector Fit the nut at the front panel N type conne...

Страница 96: ...r Fix the screw on the top cover and attach the PCA T20 18 in lbs power driver Attach the belt cover to hold the check source assembly T6 3 in lbs manual torx screwdriver Fit the screw to the front panel PCA beside the channel 2 and channel 3 T8 5 in lbs power driver Attach the filter board on top of the DAP assembly or attach the PPMC DAP assembly to the main board Table 4 8 Tools required Tool F...

Страница 97: ... Disconnect any connected cables to the 8990B 3 Remove the two T20 screws at the handle on top of the 8990B as shown in Figure 4 8 Figure 4 8 Remove the T20 screws at the handle 4 Remove the two T20 screws from the upper rear cover of the 8990B as shown in Figure 4 9 WARNING Keep track of which screws go with the handle as when during reassembling different screws may result in a safety hazard ...

Страница 98: ... 8990B Service Guide Figure 4 9 Remove the T20 screws from the upper rear cover 5 Remove the two T20 screws on the bottom rear cover of the 8990B as shown in Figure 4 10 Figure 4 10 Remove the T20 screws on the bottom rear cover ...

Страница 99: ...8990B face down and lift up the rear cover to remove it from the chassis as shown in Figure 4 11 Figure 4 11 Lift up the rear cover CAUTION Properly tighten the handle and screws Tighten the handle screws to 21 in lbs and the four rear cover screws to 18 in lbs ...

Страница 100: ...r as shown in Remove and Replace the Handle and Rear Cover on page 97 2 Remove the nuts at the sensor connector and the N type connector as shown in Figure 4 12 Figure 4 12 Remove the nuts at the sensor connector and the N type connector 3 Remove the four screws on both of the cable shields at the bottom of 8990B with the 18 in lbs T20 Torx screwdriver as shown in Figure 4 13 Remove the nuts ...

Страница 101: ... Guide 101 Figure 4 13 Remove the 4 units of screws on both of the cable shields 4 Position the 8990B upright and disengage the series of tabs around the outside of the front bezel as in Figure 4 14 Figure 4 14 Disengage the series of tabs ...

Страница 102: ...shown in Figure 4 15 Figure 4 15 Pull the front panel bezel off 6 Detach the N type connector cover 08990 00109 from the front panel PCA by unslotting it from the holes on the acquisition deck and release the two screws 0515 1246 with the 5 in lbs T10 Torx screwdriver as shown in Figure 4 16 Front panel bezel ...

Страница 103: ...nslot the N type connector and release the two screws 7 Remove the N type connector cover 08990 00109 from the front panel Figure 4 17 N type connector cover Unslot the N type connector cover from the holes on the acquisition deck Release the two screws 0515 1246 ...

Страница 104: ...to remove them from the front panel keypad as shown in Figure 4 18 Figure 4 18 Pull up all the knobs 9 Remove the screw near the front panel USB ports with the T10 5 in lbs torx screwdriver as shown in Figure 4 19 Figure 4 19 Remove the screw near the front panel USB ports ...

Страница 105: ...sengage the tab near the top of the oscilloscope look down the edge from the top and press in on the tab press straight towards the bottom of the 8990B with a flathead screwdriver while pulling up on the plastic keyboard cover as shown in Figure 4 21 12 The plastic piece and keyboard will not come all the way off because you need to repeat step 11 for the bottom tab Look along the inner edge from ...

Страница 106: ...as there is a cable connected to the top of the front panel keyboard as shown in Figure 4 22 Figure 4 22 Pull the plastic keyboard cover up Plastic piece covering front panel keyboard Top inner tab that you need to disengage Push the flathead screwdriver straight back towards the bottom of the oscilloscope and pull up as shown to disengage this tab Top of the 8990B This is where the cable is conne...

Страница 107: ... panel keyboard from the plastic keyboard cover There are a series of six tabs around the outside edge holding the plastic covering the keyboard Disengage all of these and then separate the two pieces as shown in Figure 4 24 Be sure that this cable does not fall through this opening When you reattach the cable to the front panel keyboard you will need it to be accessible If it does fall through th...

Страница 108: ...lastic keyboard cover 16 If you are replacing the front panel keyboard ensure that the front panel keyboard and the breakaway board are attached together You have to break them apart and then use the two pieces The break occurs beneath the USB ports on the front panel keyboard These are two of the tabs ...

Страница 109: ...s and then pull up to the board as shown in Figure 4 25 Figure 4 25 Remove the breakaway board 18 Disconnect the cable from the back of the breakaway board as shown in Figure 4 26 Push the breakaway board straight out away from the touchscreen and then lift it up This is the edge that breaks away from the front panel keyboard they come attached together These are two of the latches you are disenga...

Страница 110: ...o screws with the T10 torx screwdriver and then slide the board to the right to disengage the two latches on either side of the board as shown in Figure 4 27 Figure 4 27 Remove the Autoprobe board Disconnect this cable The other latch Remove these two screws Once the screws are removed disengage this latch and the on the other side to lift up and remove the board ...

Страница 111: ...connect cables There are two T15 screws on either side of the 8990B that need to be removed as shown in Figure 4 28 Figure 4 28 Remove the two t15 screws 22 Open up the front chassis after the screws are removed and the touchscreen cable blue connector and the three display cables white connectors are disconnected as shown in Figure 4 29 This is the upper right side screw that needs to be removed ...

Страница 112: ... because they are connected to the touchscreen display Disconnect this cable the one with the blue connector because it is connected to the touchscreen The touchscreen is mounted on the other side of this sheet metal Main oscilloscope body Disconnect this display cable These are the three cables that need to be disconnected before you remove the touchscreen display ...

Страница 113: ...ve the four T10 screws 24 To replace the backlight inverter board disconnect the cables from the backlight inverter board and remove the two T10 screws as shown in Figure 4 31 You may need to temporarily remove the touch screen cable blue connector in order to remove and replace the inverter board Remove these two screws and the two on the other side of the touchscreen This board should already be...

Страница 114: ...nverter board use the 5 in lbs T10 torx screwdriver to tighten the screws 26 To replace the touchscreen controller board 0960 2796 disconnect the cables from the touchscreen controller board and remove the two T10 screws as shown in Figure 4 32 Backlight inverter board Disconnect these cables Remove these two T10 screws ...

Страница 115: ... to reassemble the 8990B ensure that all the edges inner and outer edges are fully pressed in when you place the front bezel back on the 8990B Before reassembling the front chassis ensure that all the cables are pulled through their appropriate openings and reattached to the boards located on the back of the front chassis Once you have closed the chassis it is difficult to reach into the small hol...

Страница 116: ... steps a Unscrew the 4 screws 0515 0390 on the cover with the 18 in lbs T20 Torx screwdriver b Unscrew the 2 screws 0515 2032 near the AC inlet with the 5 in lbs T10 Torx screwdriver c Unscrew the 2 screws 0515 0430 opposite the AC inlet with the 5 in lbs T10 Torx screwdriver Figure 4 33 Remove the top cover 0515 0390 3 screws 0515 0390 0515 0430 2 screws 0515 2032 2 screws ...

Страница 117: ...tor base Part number Description To 08990 61607 BNC cable 10 MHz Out scope to filter board J10 08990 61619 BNC cable Trig Out scope to filter board P131 08990 61618 BNC cable Trig In scope to filter board J41 08990 61609 BNC cable filter board to 8990B 10 MHz Out J12 08990 61611 BNC cable Trig In PM to DAP board J39 08990 61620 BNC cable Trig Out PM to DAP board P129 DAP board Filter board P12 P13...

Страница 118: ... MMCX cables 08990 61616 as shown in Figure 4 35 Figure 4 35 Remove the MMCX cables 4 Remove the 2 pin cables 08990 61613 as shown in Figure 4 36 NOTE Table 4 9 can be used as a reference for reassembly DAP board Filter board P12 P13 P11 P13 J3 J4 J4 J3 J12 10 J1 ...

Страница 119: ...isconnect the semi rigid cable from the attenuator with the 5 in lbs 5 16 open end wrench and remove the calibration cable assembly N1911 61003 in between the check source board and backplane motherboard 08990 66002 as shown in Figure 4 37 DAP board Filter board Fan Channel 1 Channel 4 ...

Страница 120: ...37 Disconnect the semi rigid cable and remove the calibration cable assembly 6 Remove the sensor flex and coaxial cables 08990 61603 through the grommet and detach them from the filter board as shown in Figure 4 38 Disconnect the semi rigid cable N1913 61003 ...

Страница 121: ...r flex and coaxial cables N P Channel 1 Channel 4 Channel 1 Channel 4 Table 4 10 Coaxial cables connections Description To Channel 1 Positive J28 P Channel 1 Negative J29 N Channel 4 Positive P2 P Channel 4 Negative P3 N NOTE Table 4 10 can be used as a reference for reassembly ...

Страница 122: ...igure 4 39 Figure 4 39 Remove the SMB cables 5190 3462 08990 61608 Table 4 11 SMB cables connections Part number Description From To 08990 61608 MMCX male right angle cable J106 J14 DAP 5190 3462 SMB cables P109 P4 P 5190 3462 SMB cables P108 P5 N 5190 3462 SMB cables P111 J31 N 5190 3462 SMB cables P110 J30 P NOTE Table 4 11 can be used as a reference for reassembly ...

Страница 123: ... 8 Remove the cables from the grommet of the sheet metal and remove the BNC connectors as shown in Figure 4 40 Figure 4 40 Remove the cables from the grommet of the sheet metal A B C D E F Remove the cables from the grommet Remove the BNC connectors ...

Страница 124: ...f DAP board as shown in Figure 4 41 Table 4 12 Cable connection from the grommet of the sheet metal Label Part number Description To A 08990 61607 BNC cable 10 MHz Out scope to filter board J10 B 08990 61618 BNC cable Trig Out scope to filter board J41 C 08990 61619 BNC cable Trig In scope to filter board P131 D 08990 61609 10 MHz Out PM J12 E 08990 61611 BNC cable Trig Out PM J39 F 08990 61620 BN...

Страница 125: ...vice Guide 125 Figure 4 41 Unscrew the screws on the filter board 11 To remove and replace the sensor adapter board unscrew the four screws 0515 0372 with the 5 in lbs T10 Torx screwdriver as shown in Figure 4 42 0515 1940 Filter board ...

Страница 126: ... Repair Guide 126 Keysight 8990B Service Guide Figure 4 42 Remove the sensor adapter board 12 The locations of the PCA boards in the 8990B are shown in Figure 4 43 Sensor adapter board 0515 0372 4 screws ...

Страница 127: ...4 43 PCA boards location 13 Disconnect all the cables as shown in Figure 4 44 before removing and replacing the PCA boards Channel 4 adapter board 08990 60068 DAP board 08990 66001 Channel 1 adapter board 08990 60067 PPMC 08990 66005 Main board 08990 66002 ...

Страница 128: ...ce Guide Figure 4 44 Disconnect all the cables 14 To remove and replace the DAP board and PPMC detach the eight standoffs 08990 25000 with the 5 mm socket 5 in lbs as shown in Figure 4 45 4 connectors Twisted pair USB 2 connectors Fan cable ...

Страница 129: ...ure 4 45 Detach the 8 screws 15 To remove and replace the mainboard 08990 60064 from the deck detach the five screws 0515 2143 with the 18 in lbs T20 Torx screwdriver and the screw 0515 0372 with the 5 in lbs T10 Torx screwdriver as shown in Figure 4 46 ...

Страница 130: ...d replace the power supply module PC motherboard and scope acquisition board you must uninstall the support deck by removing the screw 0515 2032 with 5 in lbs T10 Torx screwdriver and the four screws 0515 0390 with 18 in lbs T20 Torx screwdriver as shown in Figure 4 47 0515 2143 5 screws 0515 0372 ...

Страница 131: ... Remove the support deck after the screws are removed To remove and replace the hard disk unscrew the four screws 0515 0430 with the 5in lbs T10 Torx screwdriver and then remove the hard disk SATA cable and power cable as shown in Figure 4 48 Figure 4 48 Remove and replace the hard disk 0515 2032 0515 0390 4 screws 0515 0430 SATA cable Power cable ...

Страница 132: ... using the manual torque wrench 5 16 with torque of 5 in lbs as shown in Figure 4 49 Figure 4 49 Detach the U wave attenuator pad 2 Unscrew the four screws 0515 0390 with the 18 in lbs T20 Torx screwdriver Detach the belt cover with the poron pad 08990 00110 as shown in Figure 4 50 Unscrew the four screws 0515 2007 with the 5 in lbs T8 Torx screwdriver and then remove the check source assembly 089...

Страница 133: ...re 4 50 Detach the belt cover with the poron pad 3 Unscrew the five screws 0515 2007 on the shield can bottom 08990 00601 of the check source assembly with the 5 in lbs T8 Torx screwdriver as shown in Figure 4 51 0515 2007 0515 0390 08990 00110 0515 0390 ...

Страница 134: ...e Figure 4 51 Shield can bottom of the check source assembly 4 Detach the shield can bottom and remove the check source board 08990 66004 for replacement Figure 4 52 Check source board 08990 66004 5 Take note on the connector orientation 0515 2007 ...

Страница 135: ...l the rear mounting deck with the following steps a Uninstall the L bracket from the rear mounting deck by removing the nut 0535 0082 with the 5 in lbs manual torque screwdriver and the screw 0515 2143 with the 18 in lbs T20 Torx screwdriver as shown in Figure 4 53 Figure 4 53 Uninstall the L bracket from the rear mounting deck b Remove the seven screws 0515 0390 with the 18 in lbs T20 Torx screwd...

Страница 136: ...4 Repair Guide 136 Keysight 8990B Service Guide Figure 4 54 Remove the seven screws ...

Страница 137: ... screwdriver as shown in Figure 4 55 Figure 4 55 Remove the three screws 4 Remove the rear mounting deck after the screws are removed 5 Remove and replace the remote USB port 54904 61606 with the following steps a Remove the jumper as shown in Figure 4 56 Figure 4 56 Remove the jumper USB port jumper connector ...

Страница 138: ...om the deck as shown in Figure 4 57 Figure 4 57 Detach the screws 6 To remove and replace the CPU fan assembly 3160 4331 unscrew the screws with the Philips 5 in lbs screwdriver and disconnect the jumper cable as shown in Figure 4 58 Figure 4 58 Remove the CPU fan assembly Jumper cable ...

Страница 139: ...9 disconnect the cables and six screws 0515 0374 with the 5 in lbs T10 Torx screwdriver as shown in Figure 4 59 Figure 4 59 Remove the PC motherboard 0515 0374 6 screws Fan power cable 20 pin power connector 4 pin connector Red SATA cable USB cable Standby cable Blue SATA cable LVDS cable 08990 61604 ...

Страница 140: ...ly deck assembly 08990 60205 disconnect all the cables connected to the scope acquisition board and remove all the attached screws as shown in Figure 4 60 and Figure 4 61 Figure 4 60 Uninstall the power supply deck assembly Remove 0515 0390 with the 18 in lbs T20 Torx screwdriver Remove 0515 0372 with the 5 in lbs T10 Torx screwdriver Remove 0515 0390 with the 18 in lbs T20 Torx screwdriver ...

Страница 141: ...embly 10 Before uninstalling the power supply deck assembly ensure that all the cables are removed through the grommet 11 The power supply deck assembly with the power supply module and PC motherboard after they are removed from the 8990B are as shown in Figure 4 62 PSU connector 22 pin connector ...

Страница 142: ...upply module and PC motherboard 12 Place the power supply deck assembly with the power supply module PSU faced up 13 Remove and replace the power supply module with the following steps a Unscrew the five screws 0515 0390 with the 18 in lbs T20 Torx screwdriver and slot out the PSU as shown in Figure 4 63 ...

Страница 143: ...143 Figure 4 63 Unscrew the screws and slot out the PSU b Remove the three power cables connected to the power supply module from the PC motherboard as shown in Figure 4 64 Figure 4 64 Remove the power cables connected to the power supply module ...

Страница 144: ...ew PSU replacement a new standby ON OFF cable 08990 61614 is needed to install on the PSU as shown in Figure 4 65 Figure 4 65 Loosen the screws to remove the power cables CAUTION Ensure that the connection is correct during reassembly to prevent any power trip NOTE Apply glue to the connectors to attach the connectors to the PSU permanently 8 pin connector Standby cable ...

Страница 145: ... 4 Keysight 8990B Service Guide 145 e Remove the two screws 0515 0390 on the bracket attached to the PSU with the 18 in lbs T20 torx screwdriver as shown in Figure 4 66 Figure 4 66 Remove the screws on the bracket ...

Страница 146: ... assembly 1 Remove and replace the air duct 54904 44102 with the following steps a Uninstall the connectors and the cables attached to the air duct as shown in Figure 4 67 b Uninstall the bottom slots from the tabs on the rear of the acquisition deck as shown in Figure 4 67 Figure 4 67 Uninstall the connectors and cables J128 Uninstall from the tabs J129 J127 ...

Страница 147: ...0515 1410 from the acquisition board standoff with the 5 in lbs T10 Torx screwdriver as shown in Figure 4 68 Figure 4 68 Remove the heat spread NOTE Connect the respective fan cable connector for channel 3 and 4 to J127 fan cable connector for channel 1 and 2 to J128 and another fan cable to J129 for the reassembly process ...

Страница 148: ...d replacement as shown in Figure 4 69 Figure 4 69 New thermal pads 4 To remove and replace the scope acquisition board 54901 66501 uninstall all the connectors SATA connectors and front panel power cable connector from the board and remove the six screws 0515 0372 with the 5 in lbs T10 Torx screwdriver as shown in Figure 4 70 ...

Страница 149: ...Repair Guide 4 Keysight 8990B Service Guide 149 Figure 4 70 Uninstall all the connectors CAUTION Do not damage the heatsink ...

Страница 150: ...4 Repair Guide 150 Keysight 8990B Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 151: ... 151 5 Contacting Keysight Introduction 152 Before Calling Keysight 153 Instrument Serial Numbers 155 Returning Your Peak Power Analyzer for Service 156 This chapter provides the steps to take if you experience a problem with your peak power analyzer ...

Страница 152: ...r analyzer refer to Before Calling Keysight on page 153 This section contains a checklist that helps you identify some of the common problems If you wish to contact Keysight about any aspect of the peak power analyzer from service problems to ordering information refer to Sales and Technical Support on page 8 If you wish to return the peak power analyzer to Keysight refer to Returning Your Peak Po...

Страница 153: ...ered by a separate maintenance agreement please be familiar with the terms Keysight offers several maintenance plans to service your peak power analyzer after warranty expiration Call your Keysight Sales and Service Center for full details If the peak power analyzer becomes faulty and you wish to return the faulty instrument follow the description on how to return the faulty instrument in Returnin...

Страница 154: ...et has power Check that the peak power analyzer is plugged into the proper AC power source Check that the peak power analyzer is switched on Check that the other equipment cables and connectors are connected properly and operating correctly Check the equipment settings in the procedure that was being used when the problem occurred Check that the test being performed and the expected results are wi...

Страница 155: ...peak power analyzer This label has two instrument identification entries The first provides the instruments serial number and the second provides the identification number for each option built into the instrument The serial number is divided into two parts the prefix two letters and the first four numbers and the suffix the last four numbers The prefix letters indicate the country of manufacture ...

Страница 156: ...Any information on the performance of the peak power analyzer Use the original packaging materials or a strong shipping container that is made of double walled corrugated cardboard with 159 kg 350 lb bursting strength The carton must be both large enough and strong enough to accommodate the and allow at least 3 to 4 inches on all sides of the power meter for packing material CAUTION Peak power ana...

Страница 157: ... to change without notice Always refer to the English version at the Keysight website for the latest revision Keysight Technologies 2011 2019 Edition 9 November 4 2019 Printed in Malaysia 08990 90010 08990 90010 www keysight com ...

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