Keysight N6705 Service Manual
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Keysight N6705 Service Manual

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Keysight N6705
DC Power Analyzer
Service Guide

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Summary of Contents for Keysight N6705

  • Page 1 Keysight N6705 DC Power Analyzer Service Guide...
  • Page 2 INFORMATION CONTAINED HEREIN. Printed In: disclose the Software. The EULA and the SHOULD KEYSIGHT AND THE USER HAVE A license set forth therein, does not require Printed in Malaysia. SEPARATE WRITTEN AGREEMENT WITH or permit, among other things, that...
  • Page 3 Frame or chassis terminal any unauthorized modification to the impaired if it is used in a manner not product. Return the product to a Keysight specified in the operation instructions. Sales and Service Office for service and Before Applying Power...

  • Page 4: Table Of Contents

    Initialization ................... 115 6 - Replaceable Parts ....................117 Parts List ..................118 Parts Location Diagrams .............. 120 Appendix A - Error Messages ................... 125 Displaying Error Messages ............126 Error List ..................126 Index .......................... 133 Model N6705 Service Guide...

  • Page 5: Introduction

    No procedures are provided for troubleshooting individual modules - other than identifying if a specific module is defective. If you have a defective module, you can return it to Keysight Technologies for repair or replacement. Refer to the following note.

  • Page 6: Returning An Instrument

    Repackaging for Shipment If the unit is to be shipped to Keysight Technologies for service or repair, be sure to: Attach a tag to the unit identifying the owner and indicating the ...

  • Page 7: Firmware Upgrade

    7. Choose the settings necessary for communication (GPIB address, IP address, USB ID). Then click Update. 8. Cycle power to the N6705 mainframe. The new firmware will be running in the N6705 mainframe when power is reapplied. Model N6705 Service Guide...

  • Page 9: Performance Verification

    Verification Procedure ..............13 Test Record Forms ................. 22 The verification procedures described in this chapter verify that the Keysight N6705 DC Power Analyzer is operating normally and is within published specifications. Perform the verification tests before calibrating your DC Power Analyzer.

  • Page 10: Verification Description

    Adjustable to highest rated input voltage range. Keysight 6813B or equivalent transformer or Power: 500 VA AC source RC – for N678xA Capacitor: 150 μF fixed film EPCOS B32526R0157K transient test Resistor 50 mΩ Vishay LVR01R0500FE70 Model N6705 Service Guide...
  • Page 11 AC peaks of the output current ripple, make several DC measurements and average them. If you are using a Keysight 3458A DMM, you can set up the voltmeter to do this automatically. From the instrument’s front panel, program 100 power line cycles per measurement.
  • Page 12 Disable 4-wire Disable 4-wire sense. LED sense. LED indicator is off. indicator is off. + − + − AUX VOLTAGE MEASUREMENT External Current DC supply monitor voltmeter voltmeter External DC Electronic load voltmeter power supply Model N6705 Service Guide...

  • Page 13: Verification Procedure

    For models N6763A – N6766A only. Set the instrument as described under “Voltage Readback, Low Voltage”. Record the voltage measured over the interface. The reading should be within the limits specified under “Voltage Readback Low Range”. Model N6705 Service Guide...
  • Page 14 Record the output voltage reading on the DMM. The difference between the DMM reading in steps 6 and 8 is the source effect, which should not exceed the value listed in the test record form for the appropriate model under “CV Source Effect”. Model N6705 Service Guide...
  • Page 15 AC voltage superimposed on the DC output voltage. This residual voltage is specified as the rms or peak-to-peak noise in the frequency range specified in the Keysight N6700 Modular Power System Family Specifications Guide. Turn off the DC Power Analyzer and connect a load resistor or electronic load, differential amplifier, and an oscilloscope (ac coupled) to the output (see Test Setup C).
  • Page 16 Connect a 22 AWG twisted-pair from the +/- sense terminal to the output terminals of the N6784A load. Turn on the DC Power Analyzer and program the instrument as described in the test record form under “Transient Response 6 V”. Model N6705 Service Guide...
  • Page 17 Record the external DMM reading and the auxiliary DVM readings. The auxiliary voltage reading should be within the designated voltage limit indicated in the test record form under “Auxiliary Voltage Readback”. Reverse the leads of the external power supply and repeat step 3. Model N6705 Service Guide...
  • Page 18 “Current Programming & Readback, Low Range”. For models N6761A and N6762A with option 2UA only. Connect the Keysight 3458A and a 20k resistor to the output (see Test Setup D). Set the Keysight 3458A to measure current using the 1 mA range.
  • Page 19 The readings should be within the limits specified under “100 mA Range Readback”. 12 Connect the Keysight 3458A in series with a 10 kΩ resistor to the output (see Test Setup D). Set the Keysight 3458A to measure current using the 10 mA range. Set the current measurement to the 1 mA range.
  • Page 20 “CC Source Effect”. Set the electronic load for the output channel’s voltage under “CC Source Effect”. The output status should be “CC”. If it isn’t, adjust the load so that the output voltage drops slightly. Model N6705 Service Guide...
  • Page 21 Divide the voltage drop (DMM reading) across the current shunt by its resistance to convert to amperes and record this value. The reading should be within the limits specified on the test record under Constant Current Tests, “Negative Current Output”. Model N6705 Service Guide...

  • Page 22: Test Record Forms

    Performance Verification Test Record Forms Test Record Form – Keysight N6731B and N6741B Keysight N6731B and N6741B Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback − 4 mV Minimum Voltage Vout...
  • Page 23 Performance Verification Test Record Form – Keysight N6732B and N6742B Keysight N6732B and N6742B Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback − 4 mV Minimum Voltage Vout Both...
  • Page 24 Performance Verification Test Record Form – Keysight N6733B and N6743B Keysight N6733B and N6743B Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both + 10 mV...
  • Page 25 Performance Verification Test Record Form – Keysight N6734B and N6744B Keysight N6734B and N6744B Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both + 5 mV...
  • Page 26 Performance Verification Test Record Form – Keysight N6735B and N6745B Keysight N6735B and N6745B Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both + 10 mV...
  • Page 27 Performance Verification Test Record Form – Keysight N6736B and N6746B Keysight N6736B and N6746B Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both 0 mV __________ + 200 mV Vout −...
  • Page 28 Performance Verification Test Record Form – Keysight N6751A and N6752A Keysight N6751A and N6752A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both + 1 mV...
  • Page 29 Performance Verification Test Record Form – Keysight N6753A and N6755A Keysight N6753A and N6755A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both 0 mV __________ + 20 mV Vout −...
  • Page 30 Performance Verification Test Record Form – Keysight N6754A and N6756A Keysight N6754A and N6756A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both 0 mV __________ + 50 mV Vout −...
  • Page 31 Performance Verification Test Record Form – Keysight N6761A and N6762A Keysight N6761A and N6762A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both + 9 mV...
  • Page 32 Performance Verification Test Record Form – Keysight N6763A and N6765A Keysight N6763A and N6765A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both + 5 mV...
  • Page 33 Performance Verification Test Record Form – Keysight N6764A and N6766A Keysight N6764A and N6766A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both + 13 mV...
  • Page 34 Performance Verification Test Record Form – Keysight N6773A Keysight Model N6773A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout + 10 mV __________ + 50 mV Vout −...
  • Page 35 Performance Verification Test Record Form – Keysight N6774A Keysight Model N6774A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout + 5 mV __________ + 75 mV Vout −...
  • Page 36 Performance Verification Test Record Form – Keysight N6775A Keysight Model N6775A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout + 10 mV __________ + 130 mV Vout −...
  • Page 37 Performance Verification Test Record Form – Keysight N6776A Keysight Model N6776A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout 0 mV __________ + 200 mV Vout − 100 mV...
  • Page 38 Performance Verification Test Record Form – Keysight N6777A Keysight Model N6777A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout 0 mV __________ + 300 mV Vout − 150 mV...
  • Page 39 Performance Verification Test Record Form – Keysight N6781A, N6782A, and N6784A SMU Keysight N6781A, N6782A and Report No _______________ Date __________________ N6784A Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback − 1.8 mV Minimum Voltage Vout __________ + 1.8 mV...
  • Page 40 Performance Verification Keysight N678xA SMU Test Record Card (continued) Constant Current Tests - continued CC Load Effect + 100 μA 3 A output range − 100 μA __________ + 50 μA 1 A output range − 50 μA __________ − 50 μA + 50 μA...
  • Page 41 Performance Verification Test Record Form – Keysight N6785A and N6786A SMU Keysight N6785A and N6786A Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback − 1.8 mV Minimum Voltage Vout...
  • Page 42 Performance Verification Test Record Form – Keysight N6783A-BAT and N6783A-MFG Keysight N6783A-BAT, N6783A- Report No _______________ Date __________________ Description Model Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Both +5 mV __________ +25 mV Vout −...

  • Page 43: Calibration

    If the DC Power Analyzer passes the verification tests, the unit is operating within its calibration limits and does not need to be re- calibrated. Calibration Interval The recommended calibration interval for Keysight N6700 Series power modules is one year. Keysight N6705 DC Power Analyzer mainframes do not require calibration.

  • Page 44: Calibration Description

    (LED is lit) or disabled (LED not lit). To change the 4 wire sense settings, press [Settings], then navigate to and select Advanced. Under Sense, select Local or 4 Wire sensing. Connect all leads to the output terminals as shown in the figure on the left. Model N6705 Service Guide...
  • Page 45 LED indicator is off. indicator is off. indicator is off. Keysight 3458A External Current configured as a monitor DC supply voltmeter Keysight 3458A configured as a voltmeter Keysight 3458A Electronic load configured as a voltmeter Model N6705 Service Guide...

  • Page 46: Calibration Procedure - Models N673Xb, N674Xb, N677Xa

    Turn On/Off to access the menu items. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Keysight 3458A DMM to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range. The value entered must be the maximum voltage of the range that you are calibrating.
  • Page 47 Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s full-scale current (see Cal setup B). Connect the Keysight 3458A DMM across the shunt resistor. Step 2. Select the full-scale current programming range. The value to program a range must be the maximum current of the range.
  • Page 48 To save calibration data: Save. Then select Save Calibration CAL:SAVE for all Outputs. Select Close. To exit calibration mode: Go [Back] to the Administrative CAL:STAT OFF tools menu and select Administrator Login. Select Logout, then Close Model N6705 Service Guide...

  • Page 49: Calibration Procedure - Models N675Xa

    Turn On/Off to access the menu items. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Keysight 3458A to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range. The value entered must be the maximum voltage of the range that you are calibrating.
  • Page 50 Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s full-scale current (see Cal Setup B). Connect the Keysight 3458A across the shunt resistor. Step 2. Select the full-scale current programming range. The value to program a range must be the maximum current of the range.
  • Page 51 Front Panel: SCPI Command: From the Calibration menu, select CAL:CURR:PEAK (@1) Miscellaneous, Peak Current Limit. Then select Start. Step 3 Select the first current calibration point. Front Panel: SCPI Command: The calibration is automatic. CAL:LEV P1 *OPC? Model N6705 Service Guide...
  • Page 52 To save calibration data: Save. Then select Save Calibration CAL:SAVE for all Outputs. Select Close. To exit calibration mode: Go [Back] to the Administrative CAL:STAT OFF tools menu and select Administrator Login. Select Logout, then Close Model N6705 Service Guide...

  • Page 53: Calibration Procedure - Models N676Xa

    Turn On/Off to access the menu items. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Keysight 3458A to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range. The value entered must be the maximum voltage of the range that you are calibrating.
  • Page 54 Next. Step 4. Select the second voltage calibration point. Front Panel: SCPI Command: The second calibration point is automatically CAL:LEV P2 *OPC? selected. “Enter P2 measured data” should be displayed. Model N6705 Service Guide...
  • Page 55 Step 5. Measure the output voltage with the DMM and enter the data. Front Panel: SCPI Command: Enter the value from the external DMM into CAL:DATA <data> the data field and then select Next. When calibration is complete, select Close. Model N6705 Service Guide...
  • Page 56 Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s full-scale current (see Cal Setup B). Connect the Keysight 3458A across the shunt resistor. Step 2. Select the full-scale current programming range. The value to program a range must be the maximum current of the range.
  • Page 57 The first calibration point is automatically CAL:LEV P1 *OPC? selected. “Enter P1 measured data” should be displayed. Step 4. Measure the current with the Keysight 3458A and enter the value. Front Panel: SCPI Command: Enter the value from the external DMM into CAL:DATA <data>...
  • Page 58 Wait 5 minutes for models N6761A and N6762A. Select Next. “Enter measured current” should be displayed. Step 4. Measure the current with the Keysight 3458A and enter the value. Front Panel: SCPI Command: Enter the value from the external DMM into CAL:DATA <data>...
  • Page 59 “Waiting 10 seconds” should be displayed. Step 4. Connect the Keysight 3458A and a 20 k Ω resistor to the output (see equipment list in chapter 2 and Cal Setup D). Step 5. Measure the output current with the Keysight 3458A and enter the value.
  • Page 60 Storing calibration constants overwrites the existing ones in non-volatile CAUTION memory. If you are not sure you want to permanently store the new constants, do not Save the data when you exit the calibration mode. The calibration will then remain unchanged. Model N6705 Service Guide...
  • Page 61 To save calibration data: Save. Then select Save Calibration CAL:SAVE for all Outputs. Select Close. To exit calibration mode: Go [Back] to the Administrative CAL:STAT OFF tools menu and select Administrator Login. Select Logout, then Close Model N6705 Service Guide...

  • Page 62: Calibration Procedure - Models N678Xa Smu

    Turn On/Off to access the menu items. Voltage Calibration High Range Programming and Measurement - All Models Step 1. Connect the voltage input of the Keysight 3458A to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range. The value entered must be the maximum voltage of the range that you are calibrating.
  • Page 63 Step 3. Measure the output voltage with the DMM and enter the data. This value may be positive or negative. Front Panel: SCPI Command: Enter the value from the external DMM into CAL:DATA <data> the data field and then select Next. Model N6705 Service Guide...
  • Page 64 This example selects the 1 V range of output 1. Front Panel: SCPI Command: From the Calibration menu, select CAL:VOLT:MEAS 1 , (@1) Voltage, Low Range Measurement. Then select Start. Step 2. Select the first voltage calibration point. Model N6705 Service Guide...
  • Page 65 Enter the value from the external DMM into the CAL:DATA <data> data field and then select Next. When calibration is complete, select Close. Step 9. Repeat steps 1 through 5, 7 and 8 for the 100 mV range. Model N6705 Service Guide...
  • Page 66 Enter the value from the external DMM into the CAL:DATA <data> data field and then select Next. When calibration is complete, select Close. Step 6. Repeat steps 1 through 5 for the 6 V positive limit range. Model N6705 Service Guide...
  • Page 67 Auxiliary Voltage Measurement - Models N6781A, N6785A Step 1. Connect the auxiliary input terminals to the output terminals of model N6781A. Also connect the voltage input of the Keysight 3458A to the output terminals of model N6781A (see Cal Setup E).
  • Page 68 Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s rated full-scale current (see Cal Setup B). Connect the Keysight 3458A across the shunt resistor. Step 2. Select the full-scale current programming range. The value to program a range must be the maximum current of the range.
  • Page 69 CAL:LEV P1 *OPC? selected. “Enter P1 measured data” should be displayed. Step 4. Measure the current with the Keysight 3458A and enter the value. This value may be positive or negative. Front Panel: SCPI Command: Enter the value from the external DMM into CAL:DATA <data>...
  • Page 70 CAL:LEV P3 *OPC? selected. “Enter P3 measured data” should be displayed. Step 8. Measure the current with the Keysight 3458A and enter the value. This value should be negative. Front Panel: SCPI Command: Enter the value from the external DMM into CAL:DATA <data>...
  • Page 71 Close. 1 mA Measurement Range - All Models Step 1. Connect the Keysight 3458A in series with a 10 kΩ resistor to the output (see equipment list in chapter 2 and Cal Setup D). Step 2. Select the 1 mA range of output 1.
  • Page 72 Close. 10 μA Measurement Range - Models N6781A, N6782A, N6784A Step 1. Connect the Keysight 3458A in series with a 1 MΩ resistor to the output (see equipment list in chapter 2 and Cal Setup D). Set the Keysight 3458A to measure current using the 100 μA range (no autoranging).
  • Page 73 Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s rated full-scale current (see Cal Setup B). Connect the Keysight 3458A across the shunt resistor. Step 2. Select the 3 A current limit of output 1 for models N6781A, N6782A, and N6784A.
  • Page 74 Step 1. Connect an electronic load directly to the output (see Cal Setup F). Set the load to constant current mode, current to 0.95A. Also connect the Keysight 3458A to the output terminals. Step 2. Select the 20 V resistance range of output 1.
  • Page 75 To save calibration data: Save. Then select Save Calibration CAL:SAVE for all Outputs. Select Close. To exit calibration mode: Go [Back] to the Administrative CAL:STAT OFF tools menu and select Administrator Login. Select Logout, then Close Model N6705 Service Guide...

  • Page 76: Calibration Procedure - Models N6783A-Bda And -Mfg

    Turn On/Off to access the menu items. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Keysight 3458A DMM to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range. The value entered must be the maximum voltage of the range that you are calibrating.
  • Page 77 Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s full-scale current (see Cal setup B). Connect the Keysight 3458A DMM across the shunt resistor. Step 2. Select the full-scale current programming range. The value to program a range must be the maximum current of the range.
  • Page 78 Close. Negative Current Limit Calibration Step 1. Connect the Keysight 3458A, current shunt, and a power supply to the output (see Test Setup G). Connect plus to plus, minus to minus. Set the external power supply to 3V, 3A.
  • Page 79 To save calibration data: Save. Then select Save Calibration for CAL:SAVE all Outputs. Select Close. To exit calibration mode: Go [Back] to the Administrative tools CAL:STAT OFF menu and select Administrator Login. Select Logout, then Close Model N6705 Service Guide...

  • Page 80: Change The Admin/Calibration Password

    If the message “Locked out by internal switch setting” or “Calibration is NOTE inhibited by switch setting” appears, the internal switch is set to prevent the password from being changed (refer to “Accessing the Calibration switch” in chapter 4). Model N6705 Service Guide...

  • Page 81: Disassembly

    Disassembly Electrostatic Discharge (ESD) Precautions ........82 Disassembly Procedures ..............82 This chapter discusses the disassembly procedures for troubleshooting and repairing Keysight N6705 DC Power Analyzer mainframes.

  • Page 82: Electrostatic Discharge (Esd) Precautions

    11/32 in. nut driver Removing Bulk Supply Cable 5/8 in. nut driver Removing Trigger Assembly Flat Blade driver Replacing Battery and Calibration Diagonal cutters Removing top and bottom backplanes Philips pozidrive Removing side cover without handle Model N6705 Service Guide...
  • Page 83 Use a T10 Torx to remove the top deflector; use a 5.5 mm hex to remove the bottom deflector. Install the deflector in the storage location on the opposite end of the module in case you need to re-use it in the future. Model N6705 Service Guide...
  • Page 84 Using a small screwdriver or your fingers, apply gentle, even pressure to the tabs until the connector clicks and locks the cable into place. After installation, check the cable to ensure the cable is straight and securely aligned within the connector. Figure 4-4 Model N6705 Service Guide...
  • Page 85 Use this setting if you have forgotten the password. Inhibit All calibration commands are disabled. This is useful calibration where calibration access is guarded by instrument seals. Step 3. Replace the side cover when finished. Model N6705 Service Guide...
  • Page 86 Reassemble the unit and turn it on. Access the Utilities menu, select User Preferences, then Clock Setup. Set the date and time. Properly dispose of the old battery in accordance with local laws CAUTION and regulations. Model N6705 Service Guide...
  • Page 87 Figure 4-7. Right Side Panel Figure 4-8. Left Side Panel Step 3. Remove three screws using a T10 driver from the rear panel. Figure 4-9 Step 4. Remove three screws using a T10 driver from the front panel sub assembly. Model N6705 Service Guide...
  • Page 88 To completely disconnect the top chassis, unwrap the front panel cable harnesses from the ferrite cores. Figure 4-12 Step 7. To install the top chassis, perform steps 1-6 in reverse order. Be sure to tuck all cables in before replacing the top chassis. Model N6705 Service Guide...
  • Page 89 Step 1. Remove the top chassis as previously described. Step 2. Remove three screws using a T10 driver and disconnect five cables. Figure 4-13 Step 3. Remove the bias PCA. Step 4. To install the bias PCA, perform steps 1-3 in reverse order. Model N6705 Service Guide...
  • Page 90 Step 2. Disconnect the eight cables and remove six screws using a T10 driver. Figure 4-14 Step 3. Remove the PPMC PCA by sliding forward and lifting. Step 4. To install the PPMC PCA, perform steps 1-3 in reverse order. Model N6705 Service Guide...
  • Page 91 Step 3. Disconnect the two connections and remove two screws using a T20 driver from the AC Module. grey brown Figure 4-16 Step 4. Remove the AC Module. Step 5. To install the AC Module, perform steps 1-4 in reverse order. Model N6705 Service Guide...
  • Page 92 Step 1. Remove the top chassis, PPMC PCA, Bias PCA, and AC Module as previously described. Step 2. Remove one screw using a T10 driver from the rear panel. Figure 4-17 Step 3. Unhook the cable tie and remove four screws using a T20 driver. Figure 4-18 Model N6705 Service Guide...
  • Page 93 Step 5. Disconnect four connections and remove two 11/32 in. nuts from the bulk supply. grey green brown Figure 4-21 Step 6. Remove the bulk supply. Step 7. To install the bulk supply, perform steps 1-6 in reverse order. Model N6705 Service Guide...
  • Page 94 Step 1. Remove the top chassis as previously described. Step 2. Remove the two 5/8 in. nuts from the binding posts. Figure 4-22 Step 3. Remove the trigger assembly. Step 4. To install the trigger assembly, perform steps 1-3 in reverse order. Model N6705 Service Guide...
  • Page 95 Figure 4-24 Step 4. Remove the top backplane PCA. Step 5. To install the top backplane PCA, perform steps 1-4 in reverse order. New push-on retainers can be purchased separately. Model N6705 Service Guide...
  • Page 96 Step 3. Remove two screws using a T10 driver from the back panel. (one to the AC module and the other to the bulk shroud). Figure 4-25 Step 4. Disconnect seven cables from the PPMC PCA and the two contacts to the AC module. Figure 4-26 Model N6705 Service Guide...
  • Page 97 (non-handle side - right side when viewed from front) Step 7. Carefully stand mainframe on its right end and remove three screws using a T10 driver from the side opposite to the backplane assembly. Figure 4-28 Model N6705 Service Guide...
  • Page 98 Figure 4-29 Step 9. Remove the backplane PCA. Step 10. To install the bottom backplane PCA, perform steps 1-9 in reverse order. New push-on retainers can be purchases separately. Model N6705 Service Guide...
  • Page 99 Step 2. Remove the bottom cover as previously described. Step 3. Remove three screws using a T10 driver from the rear panel and remove the rear panel. Figure 4-30 Step 4. Disconnect the USB Cable and front panel to PPMC FFC. Figure 4-31 Model N6705 Service Guide...
  • Page 100 Step 6. Remove two screws using a T10 from each side of the front panel. Figure 4-33 Step 7. Remove the sub panel. Step 8. To install the sub panel, perform steps 1-7 in reverse order. Model N6705 Service Guide...
  • Page 101 Step 2. Disconnect two cables and remove two screws using a T10 driver. Figure 4-34 Step 3. Disconnect one cable and remove four screws using a T10 driver to remove display from bracket. Figure 4-35 Step 4. To install the display, perform steps 1-3 in reverse order. Model N6705 Service Guide...
  • Page 102 Step 2. Disconnect the binding post PCA to front panel PCA ribbon cable and remove sixteen 1/4 in. nuts from the assembly. Figure 4-36 Step 3. Remove the binding post PCA. Step 4. To install the binding post PCA, perform steps 1-3 in reverse order. Model N6705 Service Guide...
  • Page 103 T10 driver. Figure 4-37 Step 4. Remove the seven knobs from the front panel. Figure 4-38 Step 5. Remove the front panel PCA. Step 6. To install the front panel PCA, perform steps 1-5 in reverse order. Model N6705 Service Guide...

  • Page 105: Troubleshooting

    Before performing the General Troubleshooting procedures, perform the Preliminary Checkout procedure in the beginning of this chapter. If the Keysight N6705 DC Power Analyzer passes selftest and there are no obvious faults, perform the verification procedures in chapter 2 to determine if any power modules are not calibrated, or are not operating properly.

  • Page 106: Preliminary Checkout

    Selftest Fail DACs 3 expected <n1> to <n2>, measured <n3>, chan <n4> Both voltage and current DACs are at full scale. n1 and n2 are the expected limits. n3 is the measured value. n4 is the channel location of the failed module. Model N6705 Service Guide...

  • Page 107: General Troubleshooting

    2. Go to Bias Assembly troubleshooting output fail? 3. Go to Backplane Assembly troubleshooting Does communication 1. Make sure the unit has the most current firmware work (USB, LAN, 2. Check the PPMC assembly GPIB)? Figure 5-1. General Troubleshooting Sheet 1 Model N6705 Service Guide...
  • Page 108 3. Replace Output Module 1. Check jumpers on Trigger Assembly Can't calibrate 2. Reset password using jumpers on Trigger Assembly all modules 3. Update firmware 4. Replace PPMC Assembly Figure 5-1. General Troubleshooting Sheet 2 Model N6705 Service Guide...
  • Page 109 2. Replace Front Panel Assembly 1. Check fans on the Output Module Is unit making more 2. Troubleshoot Bias Assembly noise than normal? 3. Check Bulk Supply Digital 1. Replace PPMC Assembly connector fails Figure 5-1. General Troubleshooting Sheet 3 Model N6705 Service Guide...
  • Page 110 No output on 2. Troubleshoot Bias Assembly all channels 3. Troubleshoot Backplane Assembly 1. Set the clock Is the clock 2. Check battery on Backplane Assembly 1 correct? 3. Replace PPMC Assembly Figure 5-1. General Troubleshooting Sheet 4 Model N6705 Service Guide...
  • Page 111 1. Check if the data log feature is enabled options working 2. Upgrade to the newest firmware correctly? Are Front Panel LEDs not 1. Replace Front Panel Assembly working? Are knobs 1. Check Front Panel Assembly working? Figure 5-1. General Troubleshooting Sheet 5 Model N6705 Service Guide...

  • Page 112: Bias Pca Troubleshooting

    If biases are still not present, replace the bias board. TP 3 U9 - 2 +5 V Same as above. TP 4 + C3 +3.3 V Same as above. − BLK Common Common Figure 5-2. Bias Board Test Points Model N6705 Service Guide...
  • Page 113 Replace Bulk Supply Bulk Supply? Is 12V bias Replace Bias Assembly present? Is 3.3V bias Replace Bias Assembly present? Is 5V bias Replace Bias Assembly present? End Bias Assembly Troubleshooting Figure 5-3. Bias PCA Troubleshooting Sheet 1 Model N6705 Service Guide...

  • Page 114: Backplane Pca Troubleshooting

    1. Try to straighten pin Any bent pins? 2. Replace Backplane Assembly Inspect soldering around connector Any cracks in 1. Re-solder connector solder? 2. Replace Backplane Assembly End Backplane Troubleshooting Procedures Figure 5-4. Backplane PCA Troubleshooting Sheet 1 Model N6705 Service Guide...

  • Page 115: Calibration And Passwords

    “value” is the serial number located on top of the interface cover. At power-up, the power system will go through the turn-on self test sequence. All other parameters will be set to the factory defaults. The mainframe is now initialized. Model N6705 Service Guide...

  • Page 117: Replaceable Parts

    Replaceable Parts Parts List ..................118 Parts Location Diagrams .............. 120 The following table documents the replaceable assembles and parts. The diagrams show the location of the parts.

  • Page 118: Parts List

    Tested Front Panel PCA for N6705 N6705-60104 5067-4399 Tested Binding Post PCA for N6705 N6705-60105 N6705-60105 Tested PWR-SPLY 1200W SINGLE-OUTPUT N6705-60106 N6705-60106 Tested PPMC w/o USB PCA for the N6705 Individual Parts 5002-2853 5002-2853 Side cover (qty 2) 5002-2855 5002-2855 Bottom cover 5002-2856...
  • Page 119 Automatic fan speed controls have been installed in all N6705A mainframes with the following serial numbers: MY47000757 - MY47000758 MY47000765 - MY47000766 MY47000789 - MY47000793 MY47000804 and up SG47000140 and up All N6705B mainframes have automatic fan speed controls. Model N6705 Service Guide...

  • Page 120: Parts Location Diagrams

    Replaceable Parts Parts Location Diagrams Figure 6-1. External Parts Model N6705 Service Guide...
  • Page 121 Replaceable Parts Figure 6-2. Top Cover Removed Model N6705 Service Guide...
  • Page 122 Replaceable Parts Figure 6-3. Top Chassis Removed Model N6705 Service Guide...
  • Page 123 Replaceable Parts Figure 6-4. Front Panel Figure 6-5. Handle Assembly Model N6705 Service Guide...

  • Page 125: Appendix A Error Messages

    Displaying Error Messages ............126 Error List ..................126 This appendix gives the error numbers and descriptions that are returned by the Keysight N6705 DC Power Analyzer. Error messages can be displayed on the front panel and also read back programmatically.

  • Page 126: Displaying Error Messages

    Calibration constants on the internal auxiliary remote ADC are outside the acceptable range. Aux imon cal constants out of range Calibration constants on the internal auxiliary imon ADC are outside the acceptable range. Wrong status An incorrect status function has been reported. Model N6705 Service Guide...
  • Page 127 Cannot initiate the transient generator. Either the voltage or the current function is set to Fixed mode. The command is not supported by this model This power modules either does not have the hardware capability or the options required to support this command. Model N6705 Service Guide...
  • Page 128 An invalid separator was found in the command string. Check for proper use of , ; : 104 Data type error A different data type than the one allowed was found in the command string. 105 GET not allowed A group execute trigger is not allowed in a command string. Model N6705 Service Guide...
  • Page 129 A character string was received, but is not allowed for this command. 160 Block data error Generic block data error 161 Invalid block data The number of data bytes sent does not match the number of bytes specified in the header. Model N6705 Service Guide...
  • Page 130 The command could not be executed because of missing hardware, such as an option. 260 Expression error An expression program data element related error occurred. 261 Math error in expression An expression program data element could not be executed due to a math error. Model N6705 Service Guide...
  • Page 131 Selftest Fail DACs 3 expected <n1> to <n2>, measured <n3>, chan <n4> Both voltage and current DACs are at full scale. n1 and n2 are the expected limits. n3 is the measured value. n4 is the channel location of the failed module. Model N6705 Service Guide...

  • Page 133: Index

    Index load effect ............14 noise ..............15 source effect ............ 14 AC module removing/installing ......... 91 disassembly ........... 82, 83 AC module ............91 backplane PCA ..........114 bias PCA ............89 bottom removing/installing ......96 binding post PCA ........... 102 top removing/installing........
  • Page 134 ..........13, 18 location ............120 voltage returning units ............6 programming accuracy ........13 readback accuracy .......... 13 safety ..............3 selftest errors ............ 106 Warning ..............3 Web URL’s ............. 5 sub panel Model N6705 Service Guide...
  • Page 135 This information is subject to change without notice. © Keysight Technologies 2007 - 2015 Printed in Malaysia Edition 10, January 2015 *N6705-90010* N6705-90010 www.keysight.com...

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