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HP 6038A, Service Manual

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TABLE OF CONTENTS

Introduction ............................................................................................................................................................................ 9

Scope .................................................................................................................................................................................... 9

Calibration and Verification ............................................................................................................................................. 9
Troubleshooting................................................................................................................................................................ 9
Principles of Operation ..................................................................................................................................................... 9
Replaceable Parts.............................................................................................................................................................. 9
Circuit Diagrams............................................................................................................................................................... 9

Safety Considerations ........................................................................................................................................................... 9
Manual Revisions ............................................................................................................................................................... 10
Firmware Revisions ............................................................................................................................................................ 10

Calibration and Verification................................................................................................................................................ 11

Introduction ........................................................................................................................................................................ 11
Test Equipment Required ................................................................................................................................................... 11
Operation Verification Tests............................................................................................................................................... 11
Calibration Procedure ......................................................................................................................................................... 11

Initial Setup..................................................................................................................................................................... 14
Voltage Monitor Zero Calibration .................................................................................................................................. 15
Common Mode Calibration ............................................................................................................................................ 15
Remote Readback Zero Calibration................................................................................................................................ 16
Constant Voltage Full Scale Calibration......................................................................................................................... 16
Voltage Monitor and Remote Readback Full Scale Calibration ..................................................................................... 17
Constant Voltage Zero Calibration ................................................................................................................................. 17
Current Monitor Zero Calibration................................................................................................................................... 17
Constant Current Zero Calibration.................................................................................................................................. 18
Current Monitor Full Scale Calibration .......................................................................................................................... 18
Constant Current Full Scale Calibration ......................................................................................................................... 19
Power Limit Calibration ................................................................................................................................................. 19
Resistance Programming Full Scale Calibration............................................................................................................. 19

Performance Tests .............................................................................................................................................................. 20

Measurement Techniques ............................................................................................................................................... 20
Constant Voltage (CV) Tests .......................................................................................................................................... 21
Constant Current (CC) Tests........................................................................................................................................... 26

Initialization Procedure....................................................................................................................................................... 28

Troubleshooting .................................................................................................................................................................... 29

Introduction ........................................................................................................................................................................ 29
Initial Troubleshooting Procedures..................................................................................................................................... 29
Electrostatic Protection....................................................................................................................................................... 30
Repair and Replacement ..................................................................................................................................................... 30

A2 Control Board Removal ............................................................................................................................................ 31
A4 FET Board Removal ................................................................................................................................................. 31
A8 HP-IB Board Removal.............................................................................................................................................. 32
A3 Front-Panel Board Removal...................................................................................................................................... 32
A1 Main Board Removal................................................................................................................................................ 32

Overall Troubleshooting Procedure.................................................................................................................................... 33
HP-IB Section Troubleshooting.......................................................................................................................................... 33
Primary Interface Troubleshooting ..................................................................................................................................... 36
Secondary Interface Troubleshooting ................................................................................................................................. 38

Voltage and Current DAC .............................................................................................................................................. 38
Readback DAC Circuits.................................................................................................................................................. 39
Readback Multiplexer (U20): ......................................................................................................................................... 39

Summary of Contents for 6038A

Page 1: ... HP Part No 5959 3346 FOR INSTRUMENTS WITH SERIAL NUMBERS HP Model 6033A Serials US38320231 and above HP Model 6038A Serials US38310401 and above For instruments with higher serial numbers a change page may be included Microfiche Part No 5959 3347 Printed in USA December 1999 ...

Page 2: ... Except for products returned to Customer from another country HP shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in HP s product price only if Customer pays HP international prices defined as destination local currency price or U S or Geneva Export price If HP is unable within a reasonable time to repair or replace any product to...

Page 3: ...cement and internal adjustments must be made by qualified service personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power discharge circuits and remove external voltage sources before touching components DO NOT SERVICE OR ADJUST ALONE Do not attempt internal serv...

Page 4: ......

Page 5: ... Calibration 17 Constant Current Zero Calibration 18 Current Monitor Full Scale Calibration 18 Constant Current Full Scale Calibration 19 Power Limit Calibration 19 Resistance Programming Full Scale Calibration 19 Performance Tests 20 Measurement Techniques 20 Constant Voltage CV Tests 21 Constant Current CC Tests 26 Initialization Procedure 28 Troubleshooting 29 Introduction 29 Initial Troublesho...

Page 6: ...ation 63 Secondary Microprocessor 63 Digital to Analog Converters 63 Analog Multiplexer 63 Status Inputs 63 Front Panel Board 64 Address Latches and Decoders 64 Volts and Amps Output Ports and Displays 64 RPG and Latches 64 Front Panel Switches and Input Port 64 Mode Indicators 66 OVP Adjust Control 66 Power Clear 66 Power Mesh and Control Board 66 Overview 66 AC Turn On Circuits 68 DC to DC Conve...

Page 7: ...dix A 99 Suggestions for Using Appendix A 99 Chapter 1 Manual Changes 99 Chapter 2 Manual Changes 99 Chapter 3 Manual Changes 101 Chapter 4 Manual Changes 101 Chapter 5 and 6 Manual Changes 102 Blank Front Panel Option 001 103 Introduction 103 Troubleshooting 103 Chapter 2 Manual Changes 103 Chapter 3 Manual Changes 104 Chapter 5 and 6 Manual Changes 104 ...

Page 8: ......

Page 9: ...ly level removal and replacement procedures are also given in this section Principles of Operation Provides block diagram level descriptions of the supply s circuits The primary interface secondary interface and the power mesh and control circuits are described These descriptions are intended as an aid in troubleshooting Replaceable Parts Provides a listing of replaceable parts for all electronic ...

Page 10: ...at shown on the title page of this manual a yellow Manual Change sheet may be supplied with the manual It defines the differences between your unit and the unit described in this manual The yellow change sheet may also contain information for correcting errors in the manual Note that because not all changes to the product require changes to the manual there may be no update information required fo...

Page 11: ...ration Verification Tests To assure that the unit is performing properly without testing all specified parameters first perform the turn on checkout procedure in the Operating Manual Then perform the following performance tests in this section Voltage Programming And Readback Accuracy Current Programming And Readback Accuracy CV Load Effect CC Load Effect Calibration Procedure Calibrate the unit t...

Page 12: ...W Open and short switched Power Resistor Value 0 25Ω 200W 6033A P C Value 2 3Ω 200W 6038A Current Monitoring Shunts Value 10mΩ 0 04 100W 6033A PC 0 0004 W P C Guildline 9230 100 Value 100mΩ 0 04 25W 6038A PC 0 0004 W Guildline 9230 15 Calibration and Test Resistors Value 100Ω 5 1W 1Ω 5 W 1KΩ 5 W 2KΩ 0 01 W C T Terminating Resistors 2 Value 50Ω 5 noninductive P Blocking Capacitors 2 Value 0 01µF 10...

Page 13: ...d Constant Current Circuit All Current Monitor Zero Calibration Constant Current Zero Calibration Current Monitor Full Scale Calibration Constant Current Full Scale Calibration A2 Control Board Power Limit Comparator All Power Limit Calibration A2 Control Board Bias Power Supplies All All Calibration Procedures 15V Supplies A8 HP IB Board Voltage Monitor Buffer All Voltage Monitor Zero Calibration...

Page 14: ... control board test connector A2J3 onto the A2J3 card edge fingers d Turn OVERVOLTAGE ADJUST control A3R59 fully clockwise e Disconnect all loads from output terminals f Connect power supply for local sensing and ensure that MODE switches are set as shown below g Connect an HP IB controller to the power supply h Reconnect line cable and turn on ac power i Allow unit to warm up for 30 minutes j Whe...

Page 15: ...ach the DVM from M on the rear panel through a 1kΩ resistor to A2P3 pin 3 V MON1 d Adjust A2R22 V MON ZERO to 0V 20µV Common Mode Calibration a Send string VSET 0 ISET 0 OUT OFF b Short power supply sense terminals S to S at rear panel c Attach the DVM from M on the rear panel through a 1kΩ resistor to A2J3 pin 3 V MON d Take initial reading from DVM e Remove both local sensing straps from rear pa...

Page 16: ... e Remove the DVM f Enter and run the following program and begin noting the controller s display 10 OUTPUT 705 VOUT 20 ENTER 705 A 30 DISP A 40 GOTO 10 50 END g Adjust A8R51 READBACK ZERO until the value displayed on the controller toggles between 0 and 5mV 6033A 0 and 15mV 6038A h After adjusting A8R51 you must continue the calibration procedure through to the completion of Constant Voltage Zero...

Page 17: ...UT 20 ENTER 705 A 30 DISP A 40 GOTO 10 50 END f Adjust A8R61 READBACK F S until the value displayed on the controller toggles between 20V and 20 005V 6033A 60V and 60 015V 6038A g After adjusting A8R61 you must continue the calibration procedure through to the completion of Constant Voltage Zero Calibration Constant Voltage Zero Calibration Note Perform this procedure only after completing Voltage...

Page 18: ...not perform the Current Monitor Zero Calibration before proceeding a Connect Rm current monitoring shunt 10 milliohm 6033A 100 milliohm 6038A 0 05 or better across power supply output terminals b Send string VSET 5 ISET 30 OUT ON 6033A VSET 5 ISET 10 OUT ON 6038A c Attach DVM from M to IM on the rear panel Use six digit display on HP 3458A DVM d Take initial reading from DVM e Attach DVM across Rm...

Page 19: ... within specifications If it is not perform Constant Current Full Scale Calibration before proceeding a Connect the power supply to the ac power line through a variable autotransformer which is set to the minimum for your line voltage e g 104V for nominal 120V line b Turn A2R25 POWER LIMIT fully counterclockwise c Connect a electronic load across the output terminals or use a 0 25Ω 200W resistor 6...

Page 20: ...6033A 18Ω 200W load resistor 6038A for the electronic load in these tests CV Source Effect Line Regulation CC Load Effect Load Regulation You may substitute 0 25Ω 200W load resistor 6033A 2 3Ω 200W load resistor 6038A in these tests CV Load Effect Load Regulation CV PARD Ripple and Noise CC Source Effect Line Regulation CC PARD Ripple and Noise The substitution of the load resistor requires adding...

Page 21: ...n OUT and OUT Use coaxial cable or shielded 2 wire cable to avoid pickup on test leads For all CV tests set the output current at full output to assure CV operation Voltage Programming And Readback Accuracy This procedure verifies that the voltage programming and readback functions are within specifications An HP IB controller must be used for this test a Connect digital voltmeter between S and S ...

Page 22: ... switch turn up current setting to full output c Turn up output voltage to 7 0Vdc 6033A 20 0Vdc 6038A as read on the digital voltmeter Figure 2 5 Basic Test Setup d Reduce the resistance of the load to draw an output current of 29Adc 6033A 10 Adc 6038A Check that the unit s CV LED remains lighted e Open circuit the load f Record the output voltage at the digital voltmeter g Reconnect the load h Wh...

Page 23: ...s case and the unit s case connect both to the same ac power outlet or check that the two ac power outlets used have the same earth ground connection Use the common mode choke as shown to reduce ground loop currents from interfering with measurement Reduce noise pickup on the test leads by using 50Ω coaxial cable and wind it five turns through the magnetic core to form the common mode choke Procee...

Page 24: ...24 Figure 2 6 RMS Measurement Test Setup CV PARD Test Figure 2 7 Peak To Peak Measurement Test Setup CV PARD Test ...

Page 25: ... band around its set voltage following a step change in load Use the equipment setup of Figure 2 5 to display output voltage transients while switching the load between 10 with the output set at 6 7Vdc 6033A 20Vdc 6038A Proceed as follows a Connect the test equipment as shown in Figure 2 5 Operate the load in constant current mode and set for minimum current b Turn the unit s power on and using DI...

Page 26: ...tup shown in Figure 2 5 except replace the load with a short circuit b Turn on ac power to the power supply c Send string VSET 20 ISET 1 0 6033A VSET 60 ISET 0 5 6038A d Check that the voltage across Rm is in the range 9 79mV to 10 22mV 6033A 48 9mV to 51 0mV 6038A Note the reading e Enter and run the following program 10 OUTPUT 705 IOUT 20 ENTER 705 A 30 DISP A 40 GOTO 10 50 END f The value displ...

Page 27: ...gure 2 5 Operate the load in constant resistance mode Amps Volt and set resistance to minimum b Connect the unit to the ac power line through a variable autotransformer set for nominal line voltage c Switch the unit s power on and turn up output voltage setting to full output d Turn up output current to 30Adc 6033A 10Adc 6038A e Increase the load resistance until the output voltage between S and S...

Page 28: ...on Procedure Follow the procedure if either the HP IB assembly has been replaced or the EEPROM U70 has been replaced 1 Install the HP IB assembly in the unit 2 Turn the power on and depending on your unit s model number send string EEINIT 6033 or EEINIT 6038 3 Turn the power off wait 5 seconds then turn the power back on 4 If the HP IB assembly has been replaced calibrate the unit Figure 2 9 CC PA...

Page 29: ...he board See Table 3 9 If a component is found to be defective replace it and re conduct the performance test When a component is replaced refer to Calibration Procedure Chapter 2 It may be necessary to perform one or more of the adjustment procedures after a component is replaced Initial Troubleshooting Procedures If a problem occurs follow the steps below in sequence a Check that input power is ...

Page 30: ... No 9300 0969 small and 9300 0970 large Do not wear a conductive wrist strap when working with potentials in excess of 500 volts the one megohm resistor will provide insufficient current limiting for personal safety g All grounding device being repaired test equipment soldering iron work surface wrist strap etc should be done to the same point h Do not wear nylon clothing Keep clothing of any kind...

Page 31: ...side cover for repair but not for calibration Remove the six mounting screws Pozidriv M4x 7 three on each side and the five board fastening screws Pozidriv M4x 17 all on top Remove the inside cover by lifting at the front edge When installing the inside cover insert it first at the right side While holding it tilted up at the left reach through the cutouts in the cover and fit the top tabs of the ...

Page 32: ... W3 3 wire cable from connector A1J3 to the A1 main board and unplug the W1 ribbon cable from connector A8J1 on the A8 HP IB board g Remove the A3 board from the front panel assembly by removing the five mounting screws Pozidriv M4x 7 Install the A3 Board by reversing the above steps Connect the power switch wires in the exact locations from which they were removed A1 Main Board Removal Removing t...

Page 33: ...s its internal selftest Along with the error codes the table also identifies various circuits or components that may have caused that error code to appear In the Power Section Troubleshooting Tables 3 10 and 3 11 give various power supply symptoms that identify the corresponding board circuit or components that may have caused that symptom The symptoms in Table 3 10 may become apparent when runnin...

Page 34: ...34 Figure 3 1 Troubleshooting Isolation ...

Page 35: ...35 Figure 3 1 Troubleshooting Isolation continued ...

Page 36: ... ERROR 17 Current DAC Full Scale Low Check U9 65 68 ERROR 18 Current DAC Full Scale High Check U9 65 68 ERROR 19 Current DAC Zero Low Check U9 65 68 ERROR 20 Current DAC Zero High Check U9 65 68 Go to Secondary SA Troubleshooting Primary Interface Troubleshooting Primary interface troubleshooting checks for the presence of bias voltages clock signals see Figure 3 3 and activity on the data lines P...

Page 37: ...37 Figure 3 3 Clock and Primary SA Waveforms ...

Page 38: ... Secondary interface troubleshooting checks the operation of the voltage current and readback DACs as well as analog multiplexer and secondary microprocessor The analog multiplexer is checked in the Readback DAC troubleshooting procedure The secondary microprocessor can only be checked using secondary SA refer to Signature Analysis Voltage and Current DAC The voltage and current DACs can be checke...

Page 39: ...test position see Table 3 2 This lets you operate the unit even though it fails the internal selftest Use the front panel controls to vary the output voltage from zero to full scale output to obtain the waveforms at U67 6 These waveforms check the operation of the readback DAC To check the multiplexer use the front panel controls to obtain the waveforms at the output of the multiplexer U24 2 Remem...

Page 40: ...40 Figure 3 4 Readback and Secondary SA Waveforms ...

Page 41: ...ect at an input pin but is correct at its source output of previous I C check for printed circuit and soldering discontinuity 6 An incorrect signature at an output could be caused by a faulty component producing that output or a short circuit in another component or on the board could be loading down that node Tables 3 2 and 3 3 show the primary front panel and secondary signature analyzer connect...

Page 42: ... ANALYZER INPUT EDGE SETTING PRIMARY SA CONNECTIONS CLOCK START STOP GROUND A8J5 pin 8 A8U37 pin 16 A8U37 pin 16 A8J5 pin 5 A8J5 in SA mode A8J5 JUMPER POSITIONS Jumpering pins 1 and 2 skips the internal selftest when the unit is turned on Jumpering pins 3 and 4 places U37 in SA mode Jumpering pins 5 and 6 is the normal operating position of the jumper Table 3 3 Secondary Signature Analyzer Test S...

Page 43: ...A 79UA U14 45 U6 3 U8 31 U36 1 D 0 PH2F 48P2 48P2 48P2 U14 60 U16 9 U6 13 U8 13 U12 22 U17 12 D 1 HU9O 6O84 6O84 6O84 U14 59 U16 8 U6 14 U8 14 U12 21 U17 13 D 2 U665 74UH 96C5 HA6P U14 58 U16 7 U6 15 U8 15 U12 20 U17 14 D 3 53PP 16A9 UH79 8OC2 U14 57 U16 6 U6 17 U8 17 U12 19 U17 15 D 4 C9C2 196F AA13 U64C U14 56 U16 5 U6 18 U8 18 U12 18 U17 16 D 5 C27C 132C 8A9F 89AP U14 55 U16 4 U6 19 U8 19 U12 1...

Page 44: ... Outputs Current Display Voltage Display 6υυυυυυυ7υυυυυυυυυ 8 6υυυυυυυ7υυυυυυυυ υ8 U1 U2 U3 U4 U5 U6 U7 U8 U9 U10 pin 3 5AHH 102A 4A3F 5AHH 5AHH 4U91 7499 5AHH CHP5 0000 pin 4 5AHH 92FF C665 5AHH 5AHH 31U5 4475 5AHH P3PP 0000 pin 5 5AHH 4FUC 5526 5AHH 5AHH 739H P7AH 5AHH H8HC 0000 pin 6 5AHH 94F0 C4A9 5AHH 5AHH 5724 OUC4 5AHH 84PU 0000 pin 10 5AHH 102A A73P 5AHH 5AHH 4U91 1467 5AHH 5UAU 0000 pin 1...

Page 45: ... Lo after approx 160 rns Outputs U13 1 U14 1 U15 3 969U U14 5 U16 6 F615 U16 5 U17 12 9C3C U13 2 U14 2 U15 4 C7AA U14 13 Toggling U16 12 U17 8 4056 U13 3 U14 3 U15 5 A372 U14 14 5AHH U16 13 U17 10 Toggling U13 4 U14 4 U17 11 Toggling U14 15 HU9C U17 1 37F8 U13 5 U16 3 5C91 U15 1 U17 2 6H15 U17 2 U13 6 U14 6 U17 9 1ABC U15 2 5V U13 7 8U73 U15 3 U13 9 5730 U15 6 U16 2 U17 3 FlP6 U13 10 PHFF U15 8 U1...

Page 46: ... Lo U11 7 U16 9 Lo U16 8 Hi S3 DISPLAY OVP depressed U11 3 Hi U11 7 U16 8 9 Toggling S4 DISPLAY SETTINGS released U11 4 Lo U11 7 U16 9 Lo U16 8 Hi S4 DISPLAY SETTINGS depressed U11 4 Hi U11 7 U16 8 9 Toggling S5 FOLDBACK released U11 5 Lo U11 7 U16 9 Lo U16 8 Hi S5 FOLDBACK depressed U11 5 Hi U11 7 U16 8 9 Toggling U12 5 Node toggles when RPG is rotated clockwise U12 9 Node toggles when RPG is rot...

Page 47: ...gnals It provides conditions for these measurements and gives the components which are the sources of the signals Tables 3 10 and 3 11 describe possible symptoms in the power section Both give lists of circuit blocks or components which can cause the symptoms shown The appropriate assembly is also given If the supply exhibits a symptom given in Table 3 10 or 3 11 go to the block which pertains to ...

Page 48: ...e ac mains connects directly to the unit s A1T3 bias transformer via the isolation transformer thereby energizing the bias supplies but it does not connect to the input rectifier and filter to create the bus voltage With the external supply the unit operates as a dc to dc converter The supply biases A4Q3 and A4Q4 PFETs with a low voltage rather than the 320Vdc bus voltage This protects the PFETs f...

Page 49: ...des steer the dc power to the correct nodes d Complete the setup of Figure 3 5 by attaching an ac mains cord to test points TP1 L black wire and TP2 N white wire and connect the green ground wire to the unit s case ground terminal or a suitably grounded cabinet screw TP1 and TP2 are accessible through the cutout on the left side of the unit and are at the left edge of the A1 main board Troubleshoo...

Page 50: ...50 Figure 3 6 Modified Mains Cord Set For Troubleshooting Power Section Blocks This section contains the blocks referenced in Tables 3 10 and 3 11 ...

Page 51: ... A2U11B 6 Control Signals 25 PWM OFF 1 7µs TTL pulses 20KHz U1A 5 26 PWM ON 1 7µs TTL pulses 20KHz U2B 6 18 Ip MONITOR 1V pk sawtooth 20KHz A2CR26 cathode at full power only 8 INHIBIT TTL Hi if not remotely inhibited A2R185C U19A 2 15 DOWN PROGRAM 1 2 3 0 while not down programming A2CR21 A2CR27 7 OVP PROGRAM 1 10 OVP 6033A e g 2Vdc if OVP set to full 1 30 OVP 6038A voltage output A3R6 wiper 5 OV ...

Page 52: ...1 A2R1 Table 3 11 No Output Failures Bias supplies and AC turn on circuit functioning Status of FET On Off Pulses PWM ON A2J3 26 PWM OFF A2J3 25 DEFECTIVE BOARD CHECK FUNCTIONAL CIRCUITS Lo Lo A2 Control ckts CV CC thru On Off Pulse Oneshots Lo Hi A2 A4 PWM and DC to DC Converter A4Q3 and A4Q4 probably failed Hi Lo A2 A4 PWM and DC to DC Converter A4Q3 and A4Q4 probably failed Hi Hi A2 A4 PWM and ...

Page 53: ... 25Vdc A2U20 1 14 wait 2s Hi 5Vdc A2U11 3 cycle power transition Lo to Hi to Lo A2U18 10 cycle power burst 1 25khz sq wave 1 1s A2U18 13 cycle power five 100ms pulses then Hi A2U18 12 cycle power two 200ms pulses then Hi A2U18 15 cycle power transition Lo to Hi at 800ms A2U17 8 cycle power transition Lo to Hi at 1 0s A2U17 11 cycle power transition Lo to Hi at 1 1s DROPOUT A2Q5 col cycle power tra...

Page 54: ... replace the PFETs replace both the PFETs and associated drive components as furnished in PFET Service Kit HP Part No 5060 2860 The PFETs are static sensitive and can be destroyed by relatively low levels of electrostatic voltage Handle the A4 power mesh board and the PFETs only after you your work surface and your equipment are properly grounded with appropriate resistive grounding straps Avoid t...

Page 55: ...dc across A2VR1 plus the voltage across A2R34 Circuit Included 15Vdc bias supply circuitry from connector pin A2P1 27 through test point A2J3 2 on A2 control board Setup The Main Troubleshooting Setup Page 48 Apply the ac mains voltage to the isolatlon transformer and set the external supply to 0Vdc Input NODE MEASUREMENT SOURCE A2U12 IN A2C17 24Vdc A1U1 A1C1 Outputs NODE NODE MEASUREMENT A2U12 OU...

Page 56: ...56 Figure 3 7 Waveforms ...

Page 57: ...er MASTER ENABLE is low or CV ERROR is more negative than about 6Vdc Comparator A4U3B triggers down programming when the voltage at A4U3B 5 is less than about 3Vdc The collector emitter current through transistor A4Q6 increases as the output voltage decreases because of feedback from voltage divider A4R24 A4R27 at A4U3A 2 Circuit Included Down programmer and 8 9V bias supply on A4 power mesh board...

Page 58: ...mp circuit is at fault by shorting A2U8 6 to A2U8 2 If oscillations stop the CV Error Amp circuit is probably at fault Troubleshooting CC Circuit I MON the output of CC Monitor Amp A2U1 in volts is 1 6 the output current in amperes CC Error Amp A2U2B compares I MON to CC PROGRAM Differentiator circuit A2U3D and A2U3C stabilizes the CC loop It differentiates IVS and has a voltage gain of 16 Its out...

Page 59: ...i A2J3 13 20 Lo A2J3 13 10 Lo A2J3 13 10 cycle power Hi Note Connecting a test probe to either input of either comparator in the OV Flipflop pins A2U14 1 6 7 8 9 14 or A2U11 13 may cause the flipflop to change states and cause the probed input to be low Troubleshooting PWM Clock The inputs to Inhibit Gate A2U19A and PWM gate A2U19B are the keys to PWM troubleshooting The 20KHz Clock starts each PW...

Page 60: ...ASUREMENT A2U21 7 0 0 TTL sq wave 320KHz A2U22 3 0 0 TTL sq wave 160KHz A2U22 6 0 0 TTL sq wave 20KHz A2U13 5 0 0 23 5µs TTL pulses 20KHz A2U13 9 0 0 23 5µs TTL pulses 20KHz A2U14 2 40 0 POWER LIMIT fully CCW Lo A2U19 8 40 0 Lo A2U13 9 40 0 Lo A2U17 6 40 0 Lo A2U13 13 40 0 Lo A2U13 5 40 0 Lo A2U17 6 40 0 POWER LIMIT fully CCW groups of 4 pulses 1 7µs TTL 20KHz A2U13 5 40 0 1 7µs TTL 20KHz OUT 40 1...

Page 61: ...te otherwise The following paragraphs describe the HP IB and the front panel board These circuits provide the interface between the power mesh circuits and the controller and or operator The HP IB and front panel boards are referenced to earth common Isolation is achieved by optical isolators on the HP IB board Data is sent between boards serially HP IB Board Circuits on the HP IB board see Figure...

Page 62: ...62 Figure 4 1 HP IB Block Diagram ...

Page 63: ...unknown voltage output of the analog multiplexer The secondary microprocessor programs the output of the readback DAC starting with the MSB and continuing down to the LSB Each bit is programmed either on or off until the output of the DAC is closest to the unknown voltage output of the multiplexer At this point the microprocessor returns the programmed value of the readback DAC Analog Multiplexer ...

Page 64: ... mode the current readings will be the same and the voltage display will switch from actual value to the voltage limit Pressing the DISPLAY OVP switch causes the voltage display to show the OVP trip voltage that has been set The microprocessor also uses the readout to display the HP IB address switch settings self test error messages and readback overrange conditions RPG and Latches When rotated t...

Page 65: ...65 Figure 4 2 Front Panel Block Diagram ...

Page 66: ...be extended by designing an instrument with two or more switch selectable voltage current ranges within the maximum power output capability as shown in Figure 4 3b An autoranging power supply provides maximum output power over a wide and continuous range of voltage and current combinations as shown in Figure 4 3c without the operator having to select the proper output range The unit is a flyback t...

Page 67: ...67 Figure 4 3 Output Characteristics Typical Dual Range and Autoranging Supplies Figure 4 4 FET Control Signals Timing Diagram ...

Page 68: ...s A train of on pulses comes through diodes A4CR4 and A4CR3 to the PFETs gates to turn on the PFETs The PFETs input capacitances hold the PFETs on between on pulses Off pulses turn on transistors A4Q1 and A4Q2 which then short the PFETs input capacitances and turn off the PFETs The on pulse one short A2U15B and off pulse one shot A2U15A generate the on and off pulses A2U15A produces a train of 160...

Page 69: ...no load will be considerably longer if components malfunction in the bleeder circuit or if fuse A1F3 is blown Constant Voltage CV Circuit The constant voltage circuit compares the output voltage to the user set CV PROGRAM VOLTAGE to produce CV CONTROL VOLTAGE Two comparison amplifier loops accomplish the comparison In the outerloop CV error amplifier A2U8 compares V MON a buffered fraction of the ...

Page 70: ...meter If the output voltage exceeds the limit the OVP Circuit initiates a PWM OFF pulse which also triggers the Down Programmer The OVP Circuit latches itself until it receives OV CLEAR or ac power is turned off The bias voltage detector resets the OVP at turn on of the unit Power Limit Comparator Two comparisons with Ip RAMP VOLTAGE provide POWER LIMIT and CONTROL V LIMIT two of the four inputs f...

Page 71: ...50 duty cycle limit or the output of the inhibit gate A2U19A MASTER ENABLE As discussed on Page 68 the PFETs turn on during and turn off at the trailing edges respectively of PWM output pulses The PWM generates pulses as follows a 20KHz dock pulse holds the 1 5µs delay flip flop A2U13B reset 1 5µs after the trailing edge of the 20KHz pulse the next pulse from the 320 KHz clock oscillator clocks th...

Page 72: ... enables the PWM 0 1 second later When either the output of the ac surge dropout detector or PCLR2 is low NAND gate A2U11A holds the circuit reset The circuit starts counting at 1 16 the clock frequency 1 25 KHz when both inputs to A2U11A are high and causes RELAY ENABLE to go high in 1 0 seconds and DROPOUT to go high in 1 1 seconds When DROPOUT goes high it stops the count and it enables the PWM...

Page 73: ...le 5 2 for abbreviations Parts not identified by reference designator are listed at the end of Table 5 4 under Mechanical and or Miscellaneous Table 5 1 Reference Designators A Assembly B Blower C Capacitor CR Diode DS Signaling Device light F Fuse FL Filter G Pulse Generator J Jack K Relay L Inductor Q Transistor RT Thermistor Disc S Switch T Transformer TB Terminal Block TS Thermal Switch U Inte...

Page 74: ...ddressable ASSY Assembly AWG American Wire Gauge BUFF Buffer CER Ceramic COMP Carbon Film Composition CONV Converter DECODER DEMULTI Decoder Demultiplexer ELECT Electrolytic EPROM Eraseble Programamble Read Only Memory FET Field Effect Transistor FF Flip Flop FXD Fixed IC Integrated Circuit INP Input LED Light Emitting Diode MET Metalized MOS Metal Oxide Silicon OP AMP Operational Amplifier OPTO O...

Page 75: ...00V 3A CR6 7 both 1901 0731 diode power rectifier 400V 1A CR8 9 both 1901 0050 diode switching 80V 200rnA CR13 15 both 1901 0731 diode power rectifier 400V 1A F2 both 2110 0007 fuse 1A 250V F3 6038A 2110 0763 fuse 1 4A 125V J1 both 1251 5927 connector 26 contact J2 both 1251 5384 connector 3 contact J3 both 1251 8676 connector 5 contact K1 both 0490 1417 relay DPST L1 both 06024 80094 choke RFI 3A...

Page 76: ...1 1914 switch 2 DPDT slide S4 both 3101 2046 switch DPDT slide T1 6033A 5080 1978 transformer power 6038A 06038 80090 transformer power T2 both 9170 1264 core magnetic used with primary wire 06023 80004 T3 both 9100 4864 transformer bias T4 both 5080 1984 choke line 2mH TP1 2 both 1251 5613 connector single contact U1 both 1906 0006 rectifier bridge 400V 1A VR1 2 6038A 1902 1377 diode zener 6 19V ...

Page 77: ...ap 220pF 5 100V C30 both 0160 4830 cap 2200pF 10 100V C31 6033A 0160 4808 cap 470pF 5 100V 6038A 0160 4801 cap 100pF 5 100V C32 both 0160 4801 cap 100pF 5 100V C33 35 both 0160 5422 cap 0 047µF 20 50V C36 6033A 0160 5422 cap 0 047µF 20 50V 6038A 0160 4833 cap 0 022µF 10 100V C37 both 0160 5422 cap 0 047µF 20 50V C38 6033A 0160 4801 cap 100pF 5 100V 6038A 0160 4803 cap 68pF 5 100V C39 40 both 0160 ...

Page 78: ...901 0050 diode switching 80V 200mA CR20 both 1901 0033 diode gen purp 180V 200mA CR21 30 both 1901 0050 diode switching 80V 200mA J1 2 both 1251 8417 connector 16 contact L1 both 06023 80090 choke bias 820µH P1 both 1251 8664 connector 30 contact P2 both 1251 8666 connector 20 contact Q1 2 both 1855 0413 transistor J FET P chan 2N5116 Q3 both 1854 0635 transistor NPN SI D44H5 Q4 both 1853 0012 tra...

Page 79: ...oth 0698 6322 res 4K 0 1 1 8W R28 both 0683 1045 res 100K 5 1 4W R29 both 0698 4416 res 169 1 1 8W R30 both 0683 7545 res 750K 5 1 4W R31 both 0698 6322 res 4K 0 1 1 8W R32 both 0698 4416 res 169 1 1 8W R33 both 0698 4447 res 280 1 1 8W R34 both 0757 0404 res 130 1 1 8W R35 both 0698 4608 res 806 1 1 8W R36 both 0757 0438 res 5 11K 1 1 8W R37 38 both 0683 1035 res 10K 5 1 4W R39 both 0686 2005 res...

Page 80: ...38A 0757 0470 res 162K 1 1 8W R73 74 6033A 0683 2035 res 20K 1 1 8W 6038A 0757 0452 res 27 4K 1 1 8W R75 both 0683 7545 res 750K 5 1 4W R76 6033A 0683 4735 res 47K 1 1 8W 6038A 0757 0446 res 15K 1 1 8W R77 6033A 0683 7545 res 750K 1 1 8W 6038A 0757 0469 res 150K 1 1 8W R78 6033A 0757 0415 res 475 1 1 8W 6038A 0698 4014 res 787 1 1 8W R79 both 0698 6983 res 20 4K 0 1 1 8W R80 both 0698 6320 res 5K ...

Page 81: ... 1 8W R120 both 0683 1005 res 10 5 1 4W R121 both 0757 0442 res 10K 1 1 8W R122 both 0683 5135 res 51K 5 1 4W R123 126 both 0683 4725 res 4 7K 5 1 4W R127 both 0683 1855 res 1 8M 5 1 4W R128 both 0683 6835 res 68K 5 1 4W R129 both 0757 0439 res 6 8K 1 1 8W R130 both 0683 1055 res 1M 5 1 4W R131 both 0683 3335 res 33K 5 1 4W R132 both 0683 2225 res 2 2K 5 1 4W R133 both 0683 2735 res 27K 5 1 4W R13...

Page 82: ... 1246 IC gate quad AND U18 both 1820 0935 IC counter binary CMOS U19 both 1820 1205 IC gate dual AND U20 both 1826 0138 IC comparator quad U21 both 1826 0065 IC comparator precision U22 both 1820 2096 IC counter binary dual VR1 2 both 1902 0018 diode zener 11 7V 5 VR3 both 1902 0777 diode zener 6 2V 5 VR4 both 1902 3110 diode zener 5 9V 2 VR5 both 1902 0575 diode zener 6 5V 2 W1 3 both 7175 0057 j...

Page 83: ...oth 0160 0127 cap 1µF 20 25V C9 both 0180 2780 cap 470µF 10 16V C10 both 0160 4834 cap 0 047µF 10 100V C11 12 both 0160 4835 cap 0 1µF 10 50V C13 6033A 0160 0161 cap 0 01µF 10 200V 6038A 0160 5022 cap 2200pF 10 600Vac CR1 4 both 1901 0050 diode switching 80V 200mA CR5 6 both 1901 1065 diode power rectifier 400V 1A CR7 6033A 1901 1127 diode power rectifier 150V 70A 6038A 1901 0887 diode power recti...

Page 84: ...0686 1005 res 10 5 1 2W 6038A 0686 3005 res 30 5 1 2W R26 6033A 0811 2490 res 0 1 3 5W 6038A 0811 2994 res 0 27 3 5W R27 both 0698 3225 res 1 43K 1 1 8W R28 both 0757 0279 res 3 16K 1 1 8W R29 both 0698 3159 res 26 1K 1 1 8W R30 both 0698 3202 res 1 74K 1 1 8W R31 both 0698 4046 res 732 1 R32 both 0757 0442 res 10K 1 1 8W R33 6033A 0698 3601 res 10 5 2W 6038A 0698 3628 res 220 5 2W R34 both 0698 4...

Page 85: ... C25 26 both 0160 5422 cap 0 047µF 20 50V C27 both 0180 0374 cap 10µ F 10 20V C28 31 both 0160 5469 cap 1µF 10 50V C32 37 both 0160 5422 cap 0 047µF 20 50V C38 both 0180 0116 cap 6 8µF 10 35V C39 40 both 0160 5422 cap 0 047µF 20 50V C41 42 both 0160 4820 cap 1800pF 5 100V C43 47 both 0160 5422 cap 0 047µF 20 50V C48 both 0180 0116 cap 6 8µF 10 35V C49 51 both 0160 5422 cap 0 047µF 20 50V C52 both ...

Page 86: ...464 1 1 8W R15 17 both 0698 4037 res 46 4 1 1 8W R18 both 0757 0280 res 1K 1 1 8W R19 both 0698 8827 res 1M 1 1 8W R20 22 both 0698 3155 res 4 64K 1 1 8W R23 both 0698 0082 res 464 1 1 8W R24 26 both 0698 3156 res 14 7K 1 1 8W R28 both 0699 0059 res 5K 0 1 1 10W R29 both 2100 3353 trimmer 20K side adjust R30 both 0699 0642 res 10K 0 1 1 10W R32 both 0757 0457 res 47 5K 1 1 8W R33 both 0698 6360 re...

Page 87: ...th 0698 3155 res 4 64K 1 1 8W R101 both 0698 6360 res 10K 0 1 1 8W R102 both 0698 3558 res 4 02K 1 1 8W R103 both 0698 3455 res 261K 1 1 8W R106 both 1810 0206 network sip 10K X7 R109 110 both 0698 3155 res 4 64K 1 1 8W R111 both 0757 0316 res 42 2 1 1 8W R112 both 1810 0305 network sip S1 both 3101 1973 HP IB switch TB1 both 0360 2312 terminal block 4 contact U1 both 1826 0468 IC MC3423P1 0V leve...

Page 88: ...732 HP IB mounting plate Chassis Electrical B1 both 3160 0343 fan S1 both 3101 0402 switch DPST on off FL1 both 9135 0223 ac line filter F1 both 2110 0383 fuse 8A 250V W1 both 8120 4355 cable ribbon A3 to A8 W2 both 8120 4352 cable 3 pin A1 to A8 W3 both 8120 4351 cable 5 pin A1 to A3 W5 6 both 8120 4356 cable ribbon A2 to A8 Chassis Mechanical both 06023 00016 chassis both 5021 8417 front frame c...

Page 89: ...ed key cap LCL both 7120 1254 LOGO both 4040 1954 display window both 06023 00020 cover top both 06023 00022 cover bottom both 06023 00009 cover terminal block 6033A 0360 2191 cover dc output 6038A 1540 1626 cover dc output both 5062 3703 strap handle both 5041 8819 handle retainer front both 5041 8820 handle retainer back both 5041 8801 foot 4 ...

Page 90: ......

Page 91: ... component reference designator prefixed with assembly number e g A2R14 4 Resistor values are in ohms Unless otherwise noted resistors are either 1 4W 5 or 1 8W 1 Parts list provides power rating and tolerance for all resistors 5 Unless otherwise noted capacitor values are in microfarads 6 Square p c pads indicate one of the following a pin 1 of an integrated circuit b the cathode of a diode or em...

Page 92: ...10 For single in line resistor packages pin 1 is marked with a dot For integrated circuit packages pin 1 is either marked with a dot or pin 1 is to the left as viewed from top of indentation on the integrated circuit package except for A8U6 and A8U8 ...

Page 93: ...93 Figure 6 1 Top View Top Covers Removed ...

Page 94: ...94 Figure 6 2 Main Board A1 Component Location ...

Page 95: ...95 Figure 6 3 Control Board A2 Component Location ...

Page 96: ...96 Figure 6 4 Front Panel Board A3 Component Location ...

Page 97: ...97 Figure 6 5 Power Mesh Board A4 Component Location ...

Page 98: ...98 Figure 6 6 HP IB Board A8 Component Location ...

Page 99: ...he appendix describes only the changes pertaining to Option 100 and how they affect the other portions of this manual Unless otherwise specified in Appendix A all other portions of the manual apply to both the standard unit and the Option 100 unit Suggestions for Using Appendix A The Option 100 changes are listed sequentially starting with Chapter 1 in the main body of the manual and working back ...

Page 100: ...12 6033A change 59 939 and 60 061 to 49 9375 and 50 0525 6038A On Page 22 in Voltage Programming and Readback Accuracy step I change 0 02 to 0 018V 6033A On Page 22 in Load Effect Load Regulation step c change 7 0V to 6 25V 6033A change 20 0V to 15 0V 6038A On Page 22 in Load Effect Load Regulation step d change 29A to 25A 6033A On Page 22 in Load Effect Load Regulation step h change 0 0027V to 0 ...

Page 101: ...oise step c change 29A to 25A 6033A On Page 28 Initialization change step 2 as follows 2 Turn the power on and depending on your unit s model number send the following strings EEINIT 6033 EEPROM 10 4 17 500 or EEINIT 6038 EEPROM 10 4 51 495 Chapter 3 Manual Changes On Page 41 in Readback Multiplexer U20 change Node U20 9 from 5V to 4 25V 6033A from 5V to 4 167V 6038A On Page 48 in Main Troubleshoo...

Page 102: ... HP P N 0698 3225 6033A change R78 from 787 to 1 96K HP P N 0698 0083 6038A Make these same changes on the schematic diagram Figure 6 7 On Page 82 add Option 100 label A2 board 9320 5540 On Page 88 change front panel from 06033 00013 to 06033 00012 6033A change front panel from 06038 00015 to 06038 00014 6038A On Page 89 add line voltage label rear panel 06033 81004 6033A add line voltage label re...

Page 103: ...blem to a specific section in the power supply If you know which section of the supply is defective simply go to that section in the troubleshooting procedure and troubleshoot as described in Chapter 3 To help you isolate the problem to a specific area of the supply use the flowchart provided in this section If you cannot isolate the problem using the flowchart you could replace the blank front pa...

Page 104: ...he OVP adjust potentiometer Change R59 from 2100 1775 to 2100 4060 On Page 86 under Chassis Electrical add Neon Pilot Light P N 1450 0647 Also add OVP Cable R59 P N 06032 60004 Under Chassis Mechanical change screened front panel to 06033 00011 6033A 06038 00013 6038A On Figure 6 7 add the neon pilot light in series with R29 33K across pins 4 and 5 of transformer T3 On Figure 6 9 the only part tha...

Page 105: ...105 Figure 3 1 Troubleshooting Isolation option 001 ...

Page 106: ......

Page 107: ...____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ Test Equipment Used Descript...

Page 108: ...V VOUT 0 0027 _______mV VOUT 0 0027 20µV 22 Source Effect 20 00V VOUT 0 003 _______mV VOUT 0 003 20µV 23 23 PARD Ripple and Noise RMS Peak to Peak 0 0 _______mV _______mV 0 003 0 030 450µV 900µV 25 Transient Recovery 90 to 100 Full Load 0 _______mV 0 050 6mV Constant Current Tests 26 Current Programming and Readback Low Current 1 000A Front Panel Display HP IB Readback 0 9785 IOUT 0 023 IOUT 0 028...

Page 109: ...____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ Test Equipment Used Descript...

Page 110: ... VOUT 0 005 _______mV VOUT 0 005 20µV 22 Source Effect 60 0V VOUT 0 008 _______mV VOUT 0 008 40µV 23 23 PARD Ripple and Noise RMS Peak to Peak 0 0 _______mV _______mV 0 003 0 030 450µV 900µV 25 Transient Recovery 90 to 100 Full Load 0 _______mV 0 075 9mV Constant Current Tests 26 Current Programming and Readback Low Current 0 500A Front Panel Display HP IB Readback 0 4896 IOUT 0 012 IOUT 0 012 ___...

Page 111: ...8 HP IB Board Add R100 p n 0698 4037 U17 p n 1820 2549 Delete C67 70 0 01uF 10 p n 0160 4832 qty 4 C71 73 2200pF 10 p n 0160 4830 qty 2 L1 choke p n 9170 1680 L2 4 core shield bead p n 9170 1454 qty 3 Q1 transistor 2N4917 p n 1853 0089 R1 47 5K 1 p n 0757 0457 CHANGE 1 continued Delete R2 12 4 64K 1 p n 0698 3155 qty 2 R79 80 0 ohm p n 8159 0005 qty 2 U117 IC 9914 talker listener p n 1821 1740 Cha...

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