Keysight E4991B, Troubleshooting Manual

Page 1: ...Keysight E4991B Impedance Analyzer Troubleshooting Guide ...

Page 2: ......

Page 3: ...rms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are fur nished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend If software is for use in the perfor mance of a U S Government prime contract or subcontract Software is delivered and licensed as Commer cial compu...

Page 4: ... the outer shell of any grounded instrument chassis before touching the test port connectors Safety Summary When you notice any of the unusual conditions listed below immediately terminate operation and disconnect the power cable Contact your local Keysight Technologies sales representative or authorized service company for repair of the instrument If you continue to operate without repairing the ...

Page 5: ...eclaration of Conformity please contact your local Keysight Technologies sales office agent or distributor Safety Notice Supplement This equipment complies with EN IEC61010 1 2010 This equipment is of MEASUREMENT CATEGORY I CAT I Do not use for CAT II III or IV This equipment is a POLLUTION DEGREE 2 INDOOR USE product This equipment is tested in stand alone condition and in combination with the ac...

Page 6: ...asses or fumes Operation of any electrical instrument in such an environment clearly constitutes a safety hazard Keep Away from Live Circuits Operators must not remove instrument covers Component replacement and internal adjustments must be made by qualified maintenance personnel Do not replace components with the power cable connected Under certain conditions dangerous voltage levels may remain e...

Page 7: ...ughout this manual Instructions contained in the warnings must be followed Safety Symbols General definitions of safety symbols used on the instrument or in manuals are listed below WARNING Dangerous voltage levels capable of causing death are present in this instrument Use extreme caution when handling testing and adjusting this instrument Instruction Manual symbol the product is marked with this...

Page 8: ... limited to the implied warranties of merchantability and fitness for a particular purpose Keysight shall not be liable for errors 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 documen...

Page 9: ...ation about the quick start measurement operation programming built in VBA I O interface and error message This is pre installed in the E4991B Press the Help hard key on the front panel to open Quick Start helps in understanding the E4991B operation quickly The latest version of online help is available at http ena tm keysight com e4991b manuals webhelp eng The online help has context sensitive he...

Page 10: ...s of this manual Chapter 1 Troubleshooting This chapter provides the procedure to isolate a faulty assembly in E4991B Chapter 2 Post Repair Procedure This chapter lists the procedures required to verify the E4991B operation after an assembly is replaced with a new one ...

Page 11: ...Troubleshooting 28 To Check the Front Panel 29 To Check the Touch Panel 29 To Check the LCD 30 To Check the External Keyboard 30 To Check the Mouse 31 To Check the External Monitor Output Port 31 To Check the External Trigger Input 31 To Check the GPIB 32 To Check the USB 32 Performance Test failure Troubleshooting 33 Recommended Adjustment for Performance Test failure 33 Performance failure Troub...

Page 12: ...10 Network Analyzer ...

Page 13: ...B Measurement View 13 To Troubleshoot the Instrument 14 No Display Troubleshooting 16 Booting Process Troubleshooting 21 Troubleshooting Using Diagnostic Test 26 Function Specific Troubleshooting 28 Performance Test failure Troubleshooting 33 This chapter provides the procedure to isolate a faulty assembly in the E4991B ...

Page 14: ...ening of covers or removal of parts are likely to expose dangerous voltages Disconnect the instrument from its power supply beforehand CAUTION Many of the assemblies in the instrument are very susceptible to damage from ESD electrostatic discharge Perform the following procedures only at a static safe workstation and wear a grounding strap CAUTION DO NOT operate without following instructions Prog...

Page 15: ...tep 1 Connect a mouse to the connectors on the Keysight E4991B rear panel Step 2 Turn the instrument on Step 3 Press key Step 4 Click Service Step 5 Click Exit Step 6 Click Yes in Exit menu The Keysight E4991B exits from Measurement View to Windows desktop Figure 1 Exit dialog box NOTE If you want to return to the Measurement View double click the Keysight E4991B icon on the desktop NOTE if you ne...

Page 16: ... is turned on the measurement view is displayed on the screen The display screen should be similar to Figure 10 E4991B application on page 25 Step 2 Check the display If no display appears on the LCD after the Keysight E4991B is turned on go to No Display Troubleshooting on page 16 If the Keysight E4991B stops during booting process despite something being displayed on the LCD go to Booting Proces...

Page 17: ...Troubleshooting 1 Impedance Analyzer 15 Figure 2 Primary trouble isolation flowchart ...

Page 18: ...s nothing despite being powered from proper ac power line isolate the failure in accordance with the procedure shown in Figure 3 Connect the keyboard to the Keysight E4991B rear panel connector and start trouble isolation The methods of trouble isolation are described in the procedural step 1 to 6 ...

Page 19: ...Troubleshooting 1 Impedance Analyzer 17 Figure 3 No display trouble isolation procedure ...

Page 20: ...fan blower doesn t run a failure in power supply is assumed Remove the Keysight E4991B outer cover and check if the following LEDs light 3 3 V and 5 V DC monitor LEDs on A60 CPU module as shown in Figure 4 LEDs on A51 DSP module as shown in Figure 5 Figure 4 LEDs on CPU module Figure 5 LEDs on DSP module ...

Page 21: ...turned on there is a possibility that the fan would not run The power shutdown occurs the moment the system fan stops by any anomaly In this case check the fan If the power shutdown occurs without a beep the problem seems to be with the A51 DSP board or the A60 CPU module Step 3 Check LED of Num Lock key Press the Num Lock key on the keyboard If the LED on the keyboard does not light as shown in F...

Page 22: ...N OFF setting of the LCD backlight is controlled by the A52 Front Panel I F board If nothing is displayed even on the external monitor the problems seems to be in the A60 CPU module Step 5 Check the flat cable Check the flat cable between the A60 CPU Module and A52 Front Panel I F board Step 6 Check around the backlight Check the inverter board and the cable between the inverter board and A52 Fron...

Page 23: ...Booting Process Troubleshooting Figure 7 represents the booting process flow in the Keysight E4991B If the Keysight E4991B stops in the booting process troubleshoot using the following step by step procedure Figure 7 Booting process flowchart ...

Page 24: ... 3 seconds NOTE While the splash screen is displayed if you want to run the BIOS setup utility push F2 key on the attached external keyboard as soon as you see the splash screen The password to enter BIOS setup utility is agt0nly 0 is Zero Changing BIOS setting may cause malfunction or lower performance of the instrument NOTE While the Boot up screen is displayed if you want to perform system reco...

Page 25: ...ndows boot screen The Windows boot screen is displayed as shown in Figure 9 If the Windows boot screen is displayed it is assumed that the SSD works and the Windows operating system is starting up Figure 8 Boot up Screen Figure 9 Windows boot screens ...

Page 26: ...ry procedure NOTE If the Keysight E4991B was turned off without proper shutdown process Microsoft Scandisk runs while the windows boot screens are displayed If a serious problem is found during the scan exe cute the system recovery For details on executing the system recovery refer to the Installation Guide If the operating system still does not boot up properly after reinstallation replace the SS...

Page 27: ...ay be displayed before the shutdown occurs Fatal Error Failed to Initialize DSP Driver or Fatal Error Failed to Initialize DSP This message indicates that the DSP board does not work or is not properly connected to the DSP DSP board Fatal Error Failed to Update DSP Code If this happens the DSP board has failed to write the DSP program into the flash ROM when the firmware was first installed or aft...

Page 28: ...s Diagnostic Test To execute the diagnostic test To isolate faulty board assembly modules execute the diagnostic test in accordance with the following procedure Step 1 Press key Step 2 Click Service Menu Test Menu Diagnostic Test NOTE To perform the diagnostic test properly the following conditions must be met Environmental temperature 23 C 5 C Warm up time 30 minutes NOTE Do not operate front pan...

Page 29: ...roubleshooting 1 Impedance Analyzer 27 Step 3 Select Execute All Follow the instruction for connection then click OK to execute the test Diagnostic Test Failure Troubleshooting Figure 11 Diagnostic Test ...

Page 30: ...ouch Panel on page 29 LCD display Almost all the information including the measurement value setup state result data processing menu bar softkey label and others are indicated on the 10 4 inch color LCD display Refer to To Check the LCD on page 30 External keyboard The external keyboard can be used for the entry of numerical and character data when it is connected to the USB connector on the front...

Page 31: ...o work a problem in the A52 Front Panel I F board or A80 CPU Module is suspected Also check the flat cable between the A52 Front Panel I F board and A80 CPU Module If only a specific key fails to work check first if the key is subsided in the panel If the rotary knob fails to work check the A52 Front Panel I F board involving the RPG To Check the Touch Panel Procedure Using the LCD display panel s...

Page 32: ...ep 3 Tap anywhere on the LCD to go through the color test screen of RED GREEN BLUE WHITE and BLACK You can also use the rotary knob turned clockwise or press the ENTRY keys on the Keysight E4991B front panel If the color test screen does not appear perform Step 4 Step 3 Connect an external VGA monitor to the External Monitor Output Port on the Keysight E4991B rear panel If the monitor screen view ...

Page 33: ...Connect an external VGA color monitor to the External Monitor Output Port on the Keysight E4991B rear panel Step 2 Turn the external monitor on Step 3 Verify that the monitor screen view is the same as the display on the LCD If the monitor screen view is abnormal a failure seems to be in the A80 CPU module To Check the External Trigger Input Procedure Step 1 Press key Step 2 Press Trigger Mode key...

Page 34: ...E4991B the problem seems to be in the A80 CPU module To Check the USB Procedure Connect a USB cable between controller PC and USB Interface port USBTMC on the rear panel of the Keysight E4991B Turn the controller PC on If the Keysight E4991B cannot detect the controller PC the problems seems to be in the CPU module Keysight I O Library should be installed on the PC ...

Page 35: ...est failure Table 2 shows the recommended adjustments when the performance test fails Select the adjustment program corresponding to the recommended adjustment and perform the adjustment Performance failure Troubleshooting Table 3 shows the recommended replacement board when the performance test fails even after adjustment Table 2 Recommended adjustment for performance test failure Failed Performa...

Page 36: ... Frequency Accuracy 1E5 Level Accuracy DC Bias Accuracy Z Measurement Accuracy Table 3 Recommended replacement board for performance test failure Table 4 Recommended replacement board for adjustment failure Failed Adjustment item A21 Source A6 Receiver A9 DC Bias Test Head Frequency Reference Source DC Offset DC Bias Level ADC RF Range Synthesizer Gain Source Power Local Gain IF Range Default Cal ...

Page 37: ...re Post Repair Procedures 36 The license code can be downloaded from the Keysight Software Manager KSM or Keysight Software Licensing KSL 36 This chapter lists the procedures required to verify the Keysight E4991B operation after an assembly is replaced with a new Impedance Analyzer ...

Page 38: ...ooting Using Diagnos tic Test 26 Perform all of the Performance Test A6 Receiver Board Perform the required adjust ments using A6 Receiver Board in Spot Adjustment of the pro gram Troubleshooting Using Diagnos tic Test 26 Perform all of the Performance Test A9 DC Bias Board Perform the required adjust ments using A9 DC Bias Board in Spot Adjustment of the pro gram Troubleshooting Using Diagnos tic...