Agilent 6811B Service Manual

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SERVICE MANUAL

AC Power Source/Analyzers

Agilent Models 6811A, 6812A, and 6813A

6811B, 6812B, and 6813B

Harmonic/Flicker Test Systems

Agilent Models 6841A and 6842A

For instruments with Serial Numbers:

AGILENT 6811A: US37290101 and up AGILENT 6811B: US38390481 and up AGILENT 6812A: US37290101 and up AGILENT 6812B: US38390451 and up AGILENT 6813A: US37290101 and up AGILENT 6813B: US38390285 and up AGILENT 6841A: US37340101 and up AGILENT 6842A: US37340101 and up

For instruments with higher serial numbers, a change page may be included.

Agilent Part No. 5962-0859 Printed in U.S.A.

Microfiche No. 6962-0860 September, 2000

Warranty Information

CERTIFICATION

Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International Standards Organization members.

WARRANTY

This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery. Agilent Technologies software and firmware products, which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period Agilent Technologies will, at its option, either repair or replace products which prove to be defective. Agilent Technologies does not warrant that the operation for the software firmware, or hardware shall be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility designated by Agilent Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to Agilent Technologies. for warranty service. Except for products returned to Customer from another country, Agilent Technologies shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies’ product price, only if Customer pays Agilent Technologies international prices (defined as destination local currency price, or U.S. or Geneva Export price).

If Agilent Technologies is unable, within a reasonable time to repair or replace any product to condition as warranted, the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT TECHNOLOGIES. SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

The above statements apply only to the standard product warranty. Warranty options, extended support contacts, product maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies' full line of Support Programs.

Safety Summary

GENERAL -

This is a Safety Class 1 instrument (provided with a terminal for connection to protective earth ground).

OPERATION - BEFORE APPLYING POWER:

Verify that the product is set to match the available line voltage, the correct line fuse is installed, and all safety precautions (see following warnings) are taken. In addition, note the instrument's external markings described under "Safety Symbols"

WARNING -

a Servicing instructions are for use by service-trained personnel. To avoid dangerous electrical shock, do not

perform any servicing unless you are qualified to do so.

a Before switching on the instrument, the protective earth terminal of the instrument must be connected to the

protective conductor of the (mains) power cord. The mains plug shall be inserted only in an outlet socket that is provided with a protective earth contact. This protective action must not be negated by the use of an extension cord (power cable) that is without a protective conductor (grounding). Grounding one conductor of a twoconductor outlet is not sufficient protection.

a If this instrument is to be energized via an auto-transformer (for voltage change), make sure the common

terminal is connected to the earth terminal of the power source.

a Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will

cause a potential shock hazard that could result in personal injury.

a Whenever it is likely that the protective earth connection has been impaired, this instrument must be made

inoperative and be secured against any unintended operation.

a Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be

used. Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.

a Do not operate this instrument in the presence of flammable gases or fumes.

a Do not install substitute parts or perform any unauthorized modification to the instrument.

a Some procedures described in this manual are performed with power supplied to the instrument while its

protective covers are removed. If contacted, the energy available at many points may result in personal injury.

a Any adjustment, maintenance, and repair of this instrument while it is opened and under voltage should be

avoided as much as possible. When this is unavoidable, such adjustment, maintenance, and repair should be carried out only by a skilled person who is aware of the hazard involved.

a Capacitors inside this instrument may hold a hazardous charge even if the instrument has been disconnected

from its power source.

SAFETY SYMBOLS

Refer to the table on the following page

WARNING The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which,

Caution The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like,

if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

Safety Symbol Definitions

Symbol Description Symbol Description

Direct current Terminal for Line conductor on

permanently installed equipment

Alternating current Caution, risk of electric shock

Both direct and alternating current Caution, hot surface

Three-phase alternating current Caution (refer to accompanying

documents)

Earth (ground) terminal In position of a bi-stable push control

Protective earth (ground) terminal

Out position of a bi-stable push control (Intended for connection to external protective conductor.)

Frame or chassis terminal On (supply)

Terminal for Neutral conductor on

Off (supply) permanently installed equipment

Terminal is at earth potential (Used for measurement and control circuits designed to be operated with one terminal at earth potential.)

Standby (supply)

Units with this symbol are not completely

disconnected from ac mains when this switch is

off. To completely disconnect the unit from ac

mains, either disconnect the power cord or have

a qualified electrician install an external switch.

Notice

Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance or use of this material.

This document contains proprietary information which is protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated into another language without the prior written consent of Agilent Technologies. The information contained in this document is subject to change without notice.

Printing History

First Edition ............October, 1995

Second Edition ...... ... July, 1997

Third Edition ......... September, 2000

Warranty Information 2 Safety Summary 3 Notice 4

Printing History 4

Table of Contents 5

1 INTRODUCTION 7

Organization 7 Safety Considerations 7 Related Documents 7 Revisions 8

Instrument Identification 8 Manual Revisions 8 Firmware Revisions 8

Electrostatic Discharge 8

2 PERFORMANCE TESTS 9

Introduction 9 Test Equipment Required 9

Current Monitoring Resistor 10 Constant Voltage Tests 10

Procedures 11

3 PRINCIPLES OF OPERATION 17

Introduction 17 General Description 17

A1 Front Panel Assembly 17 A2 GPIB / RS-232 Interface Assembly 18 A3 FET Assembly 18 A4 AC Input Assembly 18 A5 DC Rail Asembly 18 A6 Bias Assembly 19 A7 Inverter Assembly 19 A8 Digital Signal Processing (DSP) Assembly 19 A9 Output / Filter Assembly 19 A10 Control Assembly 20 A11 Trigger ( BNC ) Assembly 20

4 TROUBLESHOOTING 21

Introduction 21

Test Equipment Required 21 Troubleshooting Hints 21

Power-on Self-test Failures 22

Run-Time Errors 22

Overall Troubleshooting Flowchart 24 A1 Front Panel Assembly Troubleshooting 26 A2 GPIB/RS-232 Board Troubleshooting 26 A3 FET Board Troubleshooting 27 A5 DC Rail Assembly Troubleshooting 29 A6 Bias Assembly Troubleshooting 31 A7 Inverter Assembly Troubleshooting 33

Slow-Start Procedure 39

A8 DSP and A10 Control Assembly Troubleshooting 38 A9 Output/Filter/Relay Assembly Troubleshooting 41 A11 Trigger/BNC Board Troubleshooting 42 Initialization 44 ROM Upgrade 44

Identifying the Firmware 44 Upgrade Procedure 44

Post-repair Calibration 45

Inhibit Calibration Switch 45

Disassembly Procedures 46

List of Required Tools 47 Top Cover ( outer cover ) Removal 47 Inner Top Cover Removal 47 A1 Front Frame / Panel Assembly Removal and Replacement 47 A2 HI-IB / RS 232 Board Removal and Replacement 48 A3 AC FET Assembly Removal and Replacement 48 A4 AC Input Board Removal and Replacement 48 A5 DC Rail Board Removal and Replacement 48 A6 Bias Board Removal and Replacement 49 A7 Inverter Assembly Removal and Replacement 49 A8 DSP Board and A10 Control Board Removal and Replacement 49 A11 Trigger ( BNC ) Board Removal and Replacement 50 A9 Output Board Removal and Replacement 50

5 REPLACEABLE PARTS LIST 51

Introduction 51

Reading the Tables 51 How to Order Parts 51

6 DIAGRAMS 63

Introduction 63

General Schematic Notes 63 List of Figures 64

INDEX 115

Introduction

Organization

This manual contains information for troubleshooting and repairing to the component level models Agilent 6811A/B, 6812A/B, and 6813A/B Power Source/Analyzers, and models Agilent 6841A and 6842A Harmonic Flicker Test Systems. All models will hereafter be referred to as the ac source. This manual is organized as follows:

Chapter 1

Chapter 2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Introduction

Performance tests

Principles of operation on a block-diagram level

Troubleshooting

Replaceable parts

Diagrams

Safety Considerations

This ac power source is a Safety Class I instrument, which means it has a protective earth terminal. This terminal must be connected to earth ground through a power source equipped with a 4-wire (3-wire for Agilent 6811A/B), ground receptacle. Refer to the "Safety Summary" page at the beginning of this manual for general safety information. Before operation or repair, check the ac source and review this manual for safety warnings and instructions. Safety warnings for specific procedures are located at appropriate places in the manual.

WARNING: Hazardous voltages exist within the ac power source chassis, at the output terminals, and at

the analog programming terminals. Only qualified personnel who have been trained in working with high voltage power equipment are to service this unit.

Revisions

Instrument Identification

The ac source is identified by a 10-digit serial number. The items in this serial number are explained as follows:

3729

0101

The first two letters indicates the country of manufacture, where US = USA.

This is a code that identifies either the date of manufacture, or the date of a significant design change.

The last four digits are a unique number assigned to each unit.

Manual Revisions

This manual was written for ac sources that have the same or higher serial numbers as those listed on the title page.

NOTE: If the serial number of your unit is higher than that shown on the title page, your unit was made

after the publication of this manual and may have hardware or firmware differences not covered in this manual. If they are significant to the operation and/or servicing of the ac source, those differences are documented in one or more Manual Change sheets included with this manual.

If the serial number of your unit is lower than those shown on the title page, your unit was made before the publication of this manual and can be different from that described here. The previous versions of this manual (print date October, 1995 or July, 1997) applies to these units.

Firmware Revisions

You can obtain the firmware revision number by either reading the integrated circuit label, or query the ac source using the GPIB *IDN?' query command (see Chapter 4, Troubleshooting).

Electrostatic Discharge

CAUTION: The ac source has components that can be damaged by ESD (electrostatic discharge). Failure to

observe standard antistatic practices can result in serious degradation of performance, even when an actual failure does not occur.

When working on the ac source, observe all standard, antistatic work practices. These include, but are not limited to:

a Working at a static-free station such as a table covered with static-dissipative laminate or with a conductive

table mat (Agilent P/N 9300-0797, or equivalent).

a Using a conductive wrist strap, such as Agilent P/N 9300-0969 or 9300-0970.

a Grounding all metal equipment at the station to a single common ground.

a Connecting low-impedance test equipment to static-sensitive components only when those components have

power applied to them.

a Removing power from the ac source before removing or installing printed circuit boards.

Performance Tests

Introduction

This chapter provides test procedures for checking the operation of a model Agilent 6811AB, 6812A/B, 6813A/B AC Power Source/Analyzer and Agilent 6841A, 6842A Harmonic/Flicker Test System. The required test equipment is specified and sample performance test record sheets are included. Instructions are given for performing the tests using the front panel keypad.

Test Equipment Required

Table 2-1 lists the equipment required to perform the performance tests in this chapter. A test record sheet with specification limits and measurement uncertainties (when test using the recommended test equipment) may be found at the back of this section.

WARNING: SHOCK HAZARD. These tests should only be performed by qualified personnel. During the

performance of these tests, hazardous voltages may be present at the output of the unit.

Table 2-1. Test Equipment Required for Verification and Performance Tests

Type Specifications Recommended Model

Digital Voltmeter Resolution: 10 nV @ 1V

Readout: 8 1/2 digits Accuracy: 20 ppm

Current Monitor 0.01 ohms +/-200 ppm 10 Watts Guildline 7320/15

Audio Analyzer

Frequency Counter Accuracy @1 KHZ < 0.001% Agilent 5316B

Ratio Transformer130:1 ratio < 50 ppm

Variable-Voltage Transformer

Load Resistors 20 ohms, 5 A, 1000 W minimum

GPIB Controller Full GPIB capabilities HP Series 300 or equivalent

A ratio transformer is not required for a valid MIL-STD-5622A 4:1 test. The 30:1 ratio transformer is only required

when a 4:1 test equipment ratio is desired using the Agilent 3458A voltmeter in the 1000 volt range.

Input Voltage: 50mV TO 300V

Distortion Accuracy: +/-1db 20Hz to 20khz Residual Distortion/Noise: -80db (0.01%) 20Hz to 20kHz

Power: 1 Phase 3.4KVA Range: 104-127V 47-63 Hz / 207-253V 47-63 Hz

250 ohms, 2 A, 500 W minimum 120 ohms, 2.5 A, 750 W minimum 51 ohms, 6 A, 1800 W minimum

Agilent 3458A

Agilent 8903A

Superior Powerstat

2 - Performance Tests

Current Monitoring Resistor

A 4-terminal current monitoring resistor (current shunt ) listed in Table 2-1 is required to eliminate output current measurement error caused by voltage drops in the load leads and connections.

Constant Voltage Tests

If more than one meter or a meter and an oscilloscope are used, connect each to the sense terminals by separate leads to avoid mutual coupling effects.

Tables 2-2 through 2-8 provide the test procedures for verifying the 6811A/B, 6812A/B, 6813A/B, and the 6841A, 6842A compliance with the specifications given in Appendix A of the User’s Guide. Please refer to the CALIBRATION PROCEDURE or TROUBLESHOOTING if you observe out-of specification performance. The performance test specifications are listed in the Performance Test Records at the end of this chapter. You can record the actual measured values in the columns provided. When performing the load tests select an adequate gauge wire using the procedures given in the User’s Guide for connecting the load.

Figure 2-1. Test Setup

Performance Tests - 2

Procedures

In the following procedures the term "UUT" means "unit under test" which can be either the 6811A/B, 6812A/B, 6813A/B, 6841A, or 6842A AC Source.

Table 2-2. Voltage Programming and Readback Accuracy

Step Action Normal Result

This procedure verifies that the voltage programming / GPIB readback and Front Panel display functions are within specifications.

Turn off the UUT and connect DVM and Ratio

Transformer as shown in Test Setup Figure 2-1.

Switch S1is open.

Turn on the UUT. Recall factory defaults with *RST then

program output to

VOLT 300, FREQ 45, SHAPE:SIN

Record voltage readings at DMM and on front panel

display.

4 Program FREQ 400

Record voltage readings at DMM and on front panel

display.

6 Program FREQ 1000, CURR:PEAK 40

Record voltage readings at DMM and on front panel

display.

Table 2-3. Constant Voltage Load Effect

Step Action Normal Result

This test measures the change in output voltage resulting from a change in output current from full-load to no-load or no-load to full-load.

Turn off the UUT and connect DMM, Load Resistors,

Current shunt and Ratio Transformer as shown in Test Setup Figure 2-1 with S1 closed.

CV annunciator on

Output current near zero

Reading within specified high range 300V / 45Hz limits

Reading within specified high range 300V / 400Hz limits

Reading within specified high range 300V / 1KHz limits

Turn on the UUT. Recall factory defaults with *RST. Set

ALC:DET RMS to rms then program output to VOLT 300, FREQ 60, SHAPE:SIN

3 Record voltage reading of DMM.

Open S1

Record voltage readings at DMM.

Check test results

CV annunciator on, output current near:

1.2 amps for 6811A/B

2.5 amps for 6812A/B

5.8 amps for 6813A/B

Output current near zero.

The difference between the DMM readings in Step 3 & 5 are within specified load effect limits.

2 - Performance Tests

Table 2-4. Constant Voltage Source Effect

Step Action Normal Result

This test measures the change in output voltage resulting from a change in AC Mains Input voltage from minimum to maximum value within the line voltage specification.

Turn off the UUT and connect DMM, Load Resistors,

Current shunt and Ratio Transformer as shown in Test Setup Figure 2-1 with S1 closed.

Connect UUT AC input through a variable voltage

transformer Turn on the UUT. Recall factory defaults with *RST. Set

ALC:DET RMS to rms then program output to VOLT 300, FREQ 60, SHAPE:SIN,

Adjust variable voltage transformer to low line condition ( 104 or 207 VAC )

Record voltage reading of DMM.

Adjust variable voltage transformer to high line condition

( 127 or 253 VAC ) Record voltage readings at DMM.

Check test results

Table 2-5. RMS Current Accuracy Test

Step Action Normal Result

This test verifies the measurement accuracy of the rms current readback.

1 Turn off the UUT and connect an 20 ohm Load Resistor,

current shunt and DMM as shown in Test Setup Figure 2-1 with S1 closed.

CV annunciator on, output current near:

1.2 amps for 6811A/B

2.5 amps for 6812A/B, 6841A

5.9 amps for 6813A/B, 6842A

The difference between the DMM readings in Step 3 & 5 are within specified line effect limits.

2 Turn on the UUT. Recall factory defaults with *RST. Set

ALC:DET RMS to rms and then program output voltage to VOLT 60, FREQ 60 SHAPE:SIN, CURR 2.50 for 6811A/B; VOLT 120, FREQ 60 SHAPE:SIN, CURR 5.00 for the 6812A/B, 6813A/B, 6841A, 6842A

3 Record DVM reading and calculate rms current Readings are within specified

4 Program CURR:RANGE LOW CC annunciator on, outp ut current

5 Record DVM reading and calculate rms current Readings are within specified

CC annunciator on, outp ut current near 2.5 amps for 6811A/B - near 5 amps for the 6812A/B, 6813A/B, 6841A, 6842A

current high range limits.

near 2.5 or 5.0 amps

current low range limits.

Performance Tests - 2

Table 2-6. Harmonic Distortion Test

Step Action Normal Result

This test measures the total harmonic distortion of the output sinewave at full power

1 Turn off the UUT. Connect load resistor and DMM as

shown in Test Setup Figure 2-1 with S1 closed.

2 Turn on the UUT. Program output volta ge to

VOLT 300, FREQ 60, SHAPE:SIN, CURR MAX

3 Record the total harmonic distortion reading from the audio

analyzer and front panel display of UUT.

Table 2-7. Frequency Accuracy Test

Step Action Normal Result

This test verifies the frequency programming and measurement accuracy of the output voltage waveform.

1 Turn off the UUT. Connect the audio analyzer directly to the

UUT output terminals. Connect the frequency counter to the Monitor Output on the rear panel of the audio analyzer.

2 Turn on the UUT. Program output volta ge to

VOLT 100, FREQ 400, SHAPE:SIN, CURR MAX

3 Select AC Level on the audio analyzer. Record the output

frequency reading from counter and front panel display of UUT.

Table 2-8. DC Voltage Programming and Readback Accuracy

CV annunciator on, Outp ut current at 1.2 amps for 6811A/B

2.5 amps for 6812A/B, 6841A

5.8 amps for 6813A/B, 6842A Readings are less then maximum

specified limits.

CV annunciator on.

Readings are within specified limits @ 400Hz.

Step Action Normal Result

This test verifies the DC voltage programming and front panel readback functions are within specifications.

1 Turn off the UUT. Connect DVM directly to the output

terminals. DVM negative lead is connected to COM output terminal. Disconnect the 30:1 transformer. Open S1.

2 Turn on UUT. P rogram output voltage to VOLT 0,

OUTP:COUP DC, OFFSET 425

3 Record dc voltage at DVM and readback from front panel

display.

4 Program output voltage OFFSET -425 Output voltage at -425 Vdc,

5 Record dc voltage at DVM and readback from front panel

display.

Output voltage at +425 Vdc, output current near zero.

Readings within specified dc voltage programming and readback limits.

output current near zero. Readings within specified DC

voltage programming and readback limits.

2 - Performance Tests

Table 2-9. Performance Test Record - Agilent 6811A/B

Model Report No: Date:

Test Description Minimum

Specification

Voltage Programming & Readback Accuracy

300Vrms @ 45Hz Front Panel Display

300Vrms @ 400Hz Front Panel Display

300Vrms @ 1KHz Front Panel Display

CV Load Effect CV Line Effect

299.250 Vrms -190mV

298.200 Vrms -400mV

296.700 Vrms -700mV

Vout - 1.5V Vout - 0.3V

rms Current Readback

Front Panel Display High Range (A models) Front Panel Display Low Range (A models)

Io-0.0175A Io-0.0045A

Results Maximum

Specification

________ V ________ V

_______A _______A

300.750 Vrms +190mV

301.800 Vrms +400mV

303.300 Vrms +700mV

Vout + 1.5V Vout + 0.3V

Io+0.0175A Io+0.0045A

Meas. Uncert.

140mV (1.2mV)

1mA

1mA Front Panel Display High Range (B models) Front Panel Display Low Range (B models)

Io-0.01125A Io-0.00275A

_______A

Io+0.01125A Io+0.00275A

Total Harmonic Distortion

Audio Analyzer Front Panel Display

0 0

________ % ________ %

1% 1%

Frequency Programming & Readback Accuracy

Program 400 Hz Front Panel Display

399.960 Hz Fo - 0.040 Hz

_______ Hz _______ Hz

400.040 Hz Fo + 0.040 Hz

DC Voltage Programming & Readback Accuracy

+425 VDC Output Front Panel Display

-425 VDC Output Front panel Display

Note: 1. Measurement uncertainties are only valid when using test equipment listed in Table 2-1.

2. Voltage Programming and Readback measurement uncertainties are for a 3458A DMM in the 1000 volt range.

3. Measurement uncertainties in parenthesis are only if a 30:1 ratio transformer is used with the 3458A DMM.

424.075 Vdc Vo-0.363 Vdc

-424.075 Vdc Vo-0.363 Vdc

________Vdc ________Vdc

425.925 Vdc Vo+0.363Vdc

425.925 Vdc Vo+0.363 Vdc

1mA

0.005Hz

4.4mV

Table 2-10. Performance Test Record - Agilent 6812A/B, 6841A

Model Report No: Date:

Performance Tests - 2

Test Description Minimum

Specification

Voltage Programming & Readback Accuracy

300Vrms @ 45Hz Front Panel Display

300Vrms @ 400Hz Front Panel Display

300Vrms @ 1KHz Front Panel Display

CV Load Effect CV Line Effect

299.250 Vrms -190mV

298.200 Vrms -400mV

296.700 Vrms -700mV

Vout - 1.5V Vout - 0.3V

rms Current Readback

Front Panel Display High Range (A models) Front Panel Display Low Range (A models)

Io-0.0175A Io-0.0045A

Results Maximum

Specification

________ V ________ V

_______A _______A

300.750 Vrms +190mV

301.800 Vrms +400mV

303.300 Vrms +700mV

Vout + 1.5V Vout + 0.3V

Io+0.0175A Io+0.0045A

Meas.

Uncert.

140mV

(1.2mV)

140mV

(1.2mV)

140mV

(1.2mV)

1mA

1mA Front Panel Display High Range (B models) Front Panel Display Low Range (B models)

Io-0.0125A Io-0.0040A

_______A

Io+0.0125A Io+0.0040A

Total Harmonic Distortion

Audio Analyzer Front Panel Display

0 0

________ % ________ %

1% 1%

Frequency Programming & Readback Accuracy

Program 400 Hz Front Panel Display

399.960 Hz Fo - 0.040 Hz

_______ Hz _______ Hz

400.040 Hz Fo + 0.040 Hz

DC Voltage Programming & Readback Accuracy

+425 VDC Output Front Panel Display

-425 VDC Output Front panel Display

Note: 1. Measurement uncertainties are only valid when using test equipment listed in Table 2-1.

2. Voltage Programming and Readback measurement uncertainties are for a 3458A DMM in the 1000 volt range.

3. Measurement uncertainties in parenthesis are only if a 30:1 ratio transformer is used with the 3458A DMM.

424.075 Vdc Vo-0.363 Vdc

-424.075 Vdc Vo-0.363 Vdc

________Vdc ________Vdc

425.925 Vdc Vo+0.363Vdc

425.925 Vdc Vo+0.363 Vdc

1mA

0.005Hz

4.4mV

2 - Performance Tests

Table 2-11. Performance Test Record - Agilent 6813A/B, 6842A

Model Report No: Date:

Test Description Minimum

Specification

Voltage Programming & Readback Accuracy

300Vrms @ 45Hz Front Panel Display

300Vrms @ 400Hz Front Panel Display

300Vrms @ 1KHz Front Panel Display

CV Load Effect CV Line Effect

299.250 Vrms -190mV

298.200 Vrms -400mV

296.700 Vrms -700mV

Vout - 1.5V Vout - 0.3V

rms Current Readback

Front Panel Display High Range (A models) Front Panel Display Low Range (A models)

Io-0.0175A Io-0.0045A

Results Maximum

Specification

________ V ________ V

_______A _______A

300.750 Vrms +190mV

301.800 Vrms +400mV

303.300 Vrms +700mV

Vout + 1.5V Vout + 0.3V

Io+0.0175A Io+0.0045A

Meas.

Uncert.

140mV

(1.2mV)

140mV

(1.2mV)

140mV

(1.2mV)

1mA

1mA Front Panel Display High Range (B models) Front Panel Display Low Range (B models)

Io-0.0125A Io-0.0040A

_______A

Io+0.0125A Io+0.0040A

Total Harmonic Distortion

Audio Analyzer Front Panel Display

0 0

________ % ________ %

1% 1%

Frequency Programming & Readback Accuracy

Program 400 Hz Front Panel Display

399.960 Hz Fo - 0.040 Hz

_______ Hz _______ Hz

400.040 Hz Fo + 0.040 Hz

DC Voltage Programming & Readback Accuracy

+425 VDC Output Front Panel Display

-425 VDC Output Front panel Display

Note: 1. Measurement uncertainties are only valid when using test equipment listed in Table 2-1.

2. Voltage Programming and Readback measurement uncertainties are for a 3458A DMM in the 1000 volt range.

3. Measurement uncertainties in parenthesis are only if a 30:1 ratio transformer is used with the 3458A DMM.

422.575 Vdc Vo-0.363 Vdc

-422.575 Vdc Vo-0.363 Vdc

________Vdc ________Vdc

427.425 Vdc Vo+0.363Vdc

427.425 Vdc Vo+0.363 Vdc

1mA

0.005Hz

4.4mV

Principles of Operation

Introduction

Figure 3-1 at the end of this chapter is a block diagram showing the major circuits within the AC Power Source /Analyzer and Harmonic / Flicker Test System. These units consist of the following modules.

a A1 Front Panel Assembly

a A2 GPIB Assembly

a A3 AC FET Assembly

a A4 AC Input Assembly

a A5 DC Rail Assembly

a A6 Bias Assembly

a A7 Inverter Assembly

a A8 DSP Assembly

a A9 Output Filter Assembly

a A10 Control Assembly

a A11 Trigger Assembly

General Description

The 6811A/B, 6812A/B, and 6813A/B are 375VA, 750VA and 1750VA AC Source/Analyzers whereas the 6841A and 6842A are 750VA and 1750VA power sources are used as Harmonic / Flicker Test Systems. The 6811A/B, 6812A/B and 6841A can operate from 120, 220 or 240 volt AC input main while the 6813A/B and 6842A only operate from 220/240 volt AC input mains. All deliver regulated AC voltage and/or current from 45 to 1000 hertz. They can operate below 45 hertz to DC at derated output power. (See Users Guide for operation below 45 hertz ). They can generate sine, square, clipped sine or arbitrary waveforms. The output waveform can be controlled from the front panel keypad or computer via GPIB or RS-232. The output characteristics or measurements ( voltage, current, frequency, power factor, etc. ) can be readback via the front panel, GPIB or RS-232.

A1 Front Panel Assembly

The A1 Intelligent Front Panel assembly contains a circuit board, a vacuum florescent display assembly, keypad and rotary pulse generators ( RPG ). The circuit board contains digital logic circuits including a CPU, ROM and RAM. The front panel CPU decodes operator keystrokes and transmits the information to the A8 DSP assembly. The front panel receives information from the A8 DSP assembly to update the display. The front panel assembly is a surface mount ( SMT ) assembly and is not component level repairable. The A1 front panel assembly is common to all models.

3 - Principles of Operation

A2 GPIB / RS-232 Interface Assembly

The A2 GPIB / RS-232 interface assembly contains the CPU and GPIB interface controller for communicating with a GPIB controller. The A2 interface assembly also contains the logic for communicating with a computer via RS-

232. The interface type, GPIB or RS-232, is determined by the operator using front panel keystrokes. When using the RS-232 interface the operator can select the baud rate and parity using the front panel keypad. The GPIB / RS232 interface assembly is an SMT assembly and is not component level repairable. The A2 assembly is common to all models.

A3 FET Assembly

The 6813A/B and 6842A A3 FET assembly contains 8 power FETs and 2 bridge driver ICs. The power FETS and power transformer form an H-Bridge converter. The A3 FET H-Bridge converts the 320 volt DC rail from the AC Input assembly to 500 volts DC on the A9 Output assembly via the A5 DC Rail assembly. The A3 assembly power FETs switching frequency is synchronized with the switching frequency of the A7 Inverter assembly. The A3 FET switching frequency is approximately 42 KHz, 1/2 that of the A7 Inverter assembly.

The 6811A/B, 6812A/B and 6842A ACFET assemblies, having lower output power ratings then the 6813A/B and 6842A/B , use only 4 power FETs in the H-Bridge. These assemblies are component level repairable except for a FET failure. Power FETs replacement requires that all FETs in the H-Bridge have the same manufacture and same date code, therefore when a FET replacement is required it may be more practical to replace the ACFET assembly. The 6811A/B, 6812A/B and 6841A use one common assembly, the 6813A and 6842A use a different unique assembly. .

A4 AC Input Assembly

The AC input mains voltage is connected on the rear panel via J1049 to the A4 AC Input board. The AC input board converts the AC mains to a nominal 320 volt DC rail for use by the AC FET assembly. Relays K1040 and K1041 prevent the DC rail from energizing until the front panel on/off switch closed. Resistors R1040, R1041, R1045 and R1046 limit turn-on surge current to the input filter capacitors C1060 thru C1067. Relay K1040 bypasses the current limit resistors when energized. Relay K1040 is controlled by FET Q1040 who is driven by the input_rly_iso signal derived from the DSP assembly. Wire jumper J1047 connects the full wave bridge rectifier D1060 and input capacitors C1060 thru C1067 as either a voltage doubler for 120 volt mains or full wave bridge for 220/240 volt mains. Fuse F1020 is the main AC line fuse and F1080 protects the 320 volt DC rail to the AC FET assembly. The A4 assembly is component level repairable and there are 3 unique assemblies. One for the 6811A/B, another for the 6812A/B and 6841A and another for the 6813A/B and 6842A.

A5 DC Rail Assembly

The A5 DC Rail assembly contains U447 the CV error amplifier, U491 PWM driver, U462 PWM comparator and U475 ramp generator to control the FET H-bridge on the A3 ACFET assembly. The chassis mounted power transformer connects the 42 KHz AC from the A3 ACFET assembly to input rectifiers D400 thru D407 on the A5 DC Rail board.

Chassis mounted rail filter 5080-2329 and capacitors C500 to C503 and C508 to C509 located on the A9 Output Filter board convert the 42 KHz AC to a 503 volt DC rail for use by the A7 Inverter assembly. It also contains U423 bias voltage detector and high/low 503 volt rail voltage detection circuit. There is a red LED on the right side of the A5 DC Rail assembly to warn when high voltages are present, this LED can be seen from the right side of the AC Source without removing any covers. This assembly is component level repairable but extreme caution must be used when troubleshooting as 1100 volts peak / 503VDC is present. The A5 DC Rail assembly is common to all models.

Principles of Operation - 3

A6 Bias Assembly

The A6 Bias assembly receives the AC input mains voltage via connector J1035 from the A4AC Input assembly. The bias transformer primaries for models 6811A/B, 6812A/B, or 6841A can be configured for either 100, 120 , 200 or 230 volt nominal input and models 6813A/B and 6842A can only be configured for 200 or 230 volt nominal inputs. The input voltage range is configured by moving jumpers on J353. A J353 jumper configuration diagram is located on the bias assembly next to J353. Regulator U300 supplies +15 volts to the AC input relays and bias to the ACFET assembly. Regulators U311 and U3121 supply +5 volts to the GPIB and front panel assemblies. Opto-coupler U362 transmits the input_rly_iso signal to relay K1040 on the AC input assembly. J337 supplies +5 and +/- 15 volts to the control assembly via the Output Filter assembly and 48 volts AC via E336 to the DC rail assembly. The A6 assembly is a component level repairable assembly. There is one unique assembly for the 6811A/B, 6812A/B and 6841A and another unique assembly for the 6813A/B and 6842A.

A7 Inverter Assembly

The A7 Inverter ( output amplifier ) assembly is a switching H-bridge FET assembly operating at approximately 83 KHz. It receives its switching logic from the A10 control assembly. The A7 Inverter assembly can provide a sine, square, clipped sine, arbitrary waveform or DC level to the A9 Output Filter assembly. The Agilent 6813A/B and 6842A uses twice as many power FETs as the Agilent 6811A/B, 6812A/B and 6841A assembly. Slow start procedures, disconnecting the 503 volt DC rail, should be used when troubleshooting the Inverter assembly. See Inverter troubleshooting for more complete information on slow start procedures. The A7 Inverter assemblies are component level repairable except for a FET failure. Power FETs replacement requires that all FETs in the H-Bridge have the same manufacture and same date code, therefore when a FET replacement is required it may be more practical to replace the A7 Inverter assembly. There is one unique A7 Inverter assembly for Agilent models 6811A/B, 6812A/B and 6841A and another unique assembly for models 6813A/B and 6842A. .

A8 Digital Signal Processing (DSP) Assembly

The A8 DSP assembly contains the CPU, ROMs, Digital-to Analog ( DACs ) circuits that control the output voltage and output current settings. It contains Analog-to-Digital ( ADCs ) circuits to readback actual output voltage and current. It contains all logic circuits for generating arbitrary waveforms, frequency changes and transient or pulse level changes. At power on the A8 DSP assembly performs a self test and reports any failures via the front panel display. The A8 assembly is an SMT assembly and is not component level repairable except for the ROMs which are installed in sockets and are replaceable for ROM upgrades. There is one unique assembly for models 6811A/B, 6812A/B, and 6813A/B and another unique assembly for models 6841A and 6842A.

A9 Output / Filter Assembly

The A9 Output filter assembly contains U500 the remote sense amplifier and K501 remote sense relay. The rms and peak current sense resistors, overvoltage divider and output disconnect relays K502 and K503 ( older manufactured units use one output disconnect relay K500 ). The A9 Output assembly contains 2 notch filters to reduce the inverter switching frequency noise in the output. It provides a communication path between the A10 Control assembly, A5 DC rail assembly and A6 Bias assembly. The A9 assembly is component level repairable. There is one unique assembly for model 6811A/B and another unique assembly for models 6812A/B, 6813A/B, 6841A and 6842A.

3 - Principles of Operation

A10 Control Assembly

The A10 Control assembly contains the PWM comparator and ramp generator for controlling the A7 Inverter assembly power FETs. It contains the voltage and current rms/dc converter circuits, voltage and current readback amplifiers and all other analog circuits required to interface the output voltage , output current and frequency programming and measurement capabilities with the A8 DSP assembly. The A10 assembly is an SMT assembly and is not component lever repairable. There are three unique A10 Control assemblies, one for model 6811A/B, one for models 6812A/B, and 6841A and one for models 6813A/B, and 6842A.

A11 Trigger ( BNC ) Assembly

The A11 Trigger or BNC assembly provides the communication and isolation path for trigger out ( U157 ) and trigger in signals ( U156 ). The A11 assembly provides the isolation ( optical couplers ) between the A2 GPIB interface assembly ( U153 & U154 ) and A8 DSP assembly ( J115 ). The A11 assembly is an SMT assembly and is common to all models.

Figure 3-1. AC Power Source/Analyzer Block Diagram

Troubleshooting

Introduction

WARNING: SHOCK HAZARD. The troubleshooting procedures in this chapter are performed with

power applied and protective covers removed. These procedures should be performed only by service trained personnel who are aware of the hazards (e.g., fire and electrical shock).

CAUTION: This instrument uses components which can either be damaged or suffer serious performance

degradation as a result of ESD (electrostatic discharge). Observe the standard antistatic precautions to avoid damage to the components. An ESD summary is given in Chapter 1.

This chapter provides troubleshooting and repair information for the AC Power Source. Before beginning troubleshooting procedures make certain the problem is in the AC Power Source and not with an associated circuit , the GPIB controller or AC input lines. Without removing the covers you can use the verification tests in Chapter 2 to determine if the AC Power Source is operating normally.

Test Equipment Required

Table 4-1 lists the equipment required to perform the troubleshooting procedures given in this chapter.

Table 4-1. Test Equipment Requirements for Troubleshooting

Equipment Characteristics Recommended Model

GPIB Controller Communicate with AC Source via GPIB or

RS232

Digital Voltmeter Check voltages /resistances Agilent 3458A or equivalent

Function Generator Generate waveforms Agilent 3312A or equivalent

Oscilloscope Observe waveforms Agilent 54504A or equivalent

Current Shunt Check output current 0.01 ohm 10 watt

Logic Probe Check data lines Agilent 545A or equivalent

HP Series 200/300 controller or Equivalent.

Troubleshooting Hints

a Service kit 5063-2330 contains 2 PC board holders to hold the A5 DC Rail board in a vertical position for

troubleshooting, and a PC board extender that raises the A8 DSP and A10 Control boards above the chassis for troubleshooting.

Extender board part number 5063-2331 PC B holder part number 5020-8458 Cable part number 5080-2381

a Locate and observe the 2 red LEDs which indicate when high voltage is present on the A4 AC input board, A5

DC rail board, and A9 output board. Wait for the LEDs to extinguish before removing or installing assemblies.

a If both CV and CC annunciators are on, the peak current limit is may be set to low.

4 - Troubleshooting

Power-on Self-test Failures

The power-on self-test sequence tests of most of the digital and DAC circuits. If the supply fails self-test, the display "ERR" annunciator will come on. You can then query the unit to find out what the error(s) are. When an error is detected, the output is not disabled so you can still attempt to program the supply to help troubleshoot the unit. Table 4-2 lists the self test errors and gives a possible remedy for each error. Table 4-3 lists the run-time errors that can occur at any time while the unit is running.

NOTE: A partial self test is performed when the *TST? query is executed. Those tests that interfere with

normal interface operation or cause the output to change are not performed by *TST?. The return value of *TST? will be zero if all tests pass, or the error code of the first test that failed. The power supply will continue normal operation if *TST? returns a non-zero value.

Table 4-2. Self-Test Errors

Error # Description Possible Remedy

0 No error -

1 Non-volatile RAM RD0 section checksum failed A

2 Non-volatile RAM CONFIG section checksum failed A

3 Non-volatile RAM CAL section checksum failed A

4 Non-volatile RAM WAVEFORM section checksum failed A

5 Non-volatile RAM STATE section checksum failed A

6 Non-volatile RAM LIST section checksum failed A

7 Non-volatile RAM RST section checksum failed A

10 RAM selftest B

11 - 31 DAC selftest error, expected <n>, read <reading>

Errors 11, 12, 13, 14, 15 apply to DAC12 1A and 1B Errors 16, 17, 18 apply to DAC12 2A Errors 19, 20, 21 apply to DAC12 2B Errors 22, 23 apply to DAC12 4A Errors 24, 25 apply to DAC12 4B Errors 26, 27, 28 apply to DAC12 3A and 3B Errors 29, 30, 31 apply to DAC12 5A and 5B

40 Voltage selftest error C

43 Current selftest error C

70 Fan voltage failure D

80 Digital I/O selftest error D

A Re-initialize unit and re-calibrate. If unit still has RAM error replace A8 DSP board.

B Check A8 DSP and A10 Control assemblies

C *TST? programs 50 volts, expected readback 50+/-1volt 0+/-1amp

D Check fan and/or fan voltage or replace A8 DSP assembly.

Run-Time Errors

Run-time errors do not occur during self-test, but can occur at any time while the unit is running. (See Table 4-3).

Troubleshooting - 4

Table 4-3. Run-Time Errors

Error # Description Possible Remedy

200 Outgrd not responding E

201 Front panel not responding F

210 Ingrd receiver framing error E

211 Ingrd uart overrun status E

212 Ingrd received bad token E

213 Ingrd receiver buffer overrun E

214 Ingrd input buffer overrun E

215 Outgrd output buffer overrun E

216 RS-232 receiver framing error G

217 RS-232 receiver parity error G

218 RS-232 receiver overrun error G

219 Ingrd inbuf count sync error E

220 Front panel uart overrun F

221 Front panel uart framing F

222 Front panel uart parity F

223 Front panel buffer overrun F

224 Front panel timeout F

401 CAL switch prevents calibration H

402 CAL password is incorrect H

403 CAL not enabled J

404 Computed readback cal constants are incorrect J

405 Computed programming cal constants are incorrect J

406 Incorrect sequence of calibration commands J

600 Systems in mode:list have different list lengths K

601 Requested voltage and waveform exceeds peak voltage capability K

602 Requested voltage and waveform exceeds transformer volt-second rating K

603 Command only applies to RS-232 interface K

604 Trigger received before requested number of pre-trigger readings K

605 Requested RMS current too high for voltage range K

606 Waveform data not defined K

607 VOLT, VOLT:SLEW, and FUNC:SHAP modes incompatible K

608 Measurement overrange K

609 Output buffer overrun K

610 Command cannot be given with present SYST:CONF setting K

E Communication error between A1 GPIB, A8 DSP and/or A11 trigger assemblies.

F Communication error between A3 front panel, A8 DSP and /or A11 Trigger assemblies.

G RS-232 communication or programming error.

H Check CAL switch positions (see Figure 4-11).

J See Appendix B in User’s Guide for calibration procedure.

K Programming error (see applicable programming command in Programming Guide).

4 - Troubleshooting

Overall Troubleshooting Flowchart

Figure 4-1 gives the overall procedures to isolate a fault to a circuit board or particular circuit. See Figure 6-1 for the location of the circuit boards.

START TROUBLESHOOTING PROCEDURES

TURN UNIT OFF. DISCONNECT LOAD

REMOVE OUTER COVER (TORX T25 ) REMOVE INNER COVER ( TORX T15 )

CHECK FOR ANY INDICATION AC POWER ON

TURN UNIT ON

AC INPUT ASSY

LED ON ?

note 1

YES

IS DISPLAY ON

YES

PRESS SHIFT KEY ON

SEE FIGURES 6-8 AND 6-9. CHECK FUSE A4F1020 / LINE SWITCH, A4 E1048 CONNECTIONS TO L1050 LINE CHOKE CHECK A4TP1050-2 FOR ~150VDC, +RAIL FOR ~300VDC SEE FIGURES 6-12 & 6-13 CHECK FUSE A6 F300 & A6 F301, +15Vpri & +12Vpri FROM A6 BIAS ASSY TO A4 ACINPUT ASSY

IS FAN ON

YES

FRONT PANEL

SHIFT

ANNUNICIATOR

LIGHTS

YES

NONO

CHECK FUSE A6F301 LINE VOLTAGE SWITCH A4J353 SETTING SEE A6 BIAS BOARD TROUBLESHOOTING

CHECK +5V TO A8 DSP

ASSY

CHECK DRDX / DTXD SIGNALS @ A11 TRIGGER ASSY. U150-5 TO D COM J7462-2 ON A8 DSP ASSY. U151-1 TO D COM J7462-2 ON A8 DSP ASSY. U164-5 TO D COM J7462-2 ON A8 DSP ASSY. U163-6 TO H COM J114-2 ON A11 TRIG ASSY. CHECK BIAS VOLTAGES ( +5V SEC / -15V ) A6 BIAS / A9 OUTPUT / A8 DSP / A10 CONTROL ASSY GO TO A1 FRONT PANEL TROUBLESHOOTING

IS ERROR

ANNUNICATOR

YES

PRESS [ SHIFT ] [ ERROR ]. SEE TABLE 4-2 FOR SELF-TEST ERROR MESSAGE

PROGRAM

"VOLT 120"

"OUTPUT ON"

Notes: 1. View LED from lower left side of power supply.

"A"

Figure 4-1. Overall Troubleshooting Procedures (sheet 1 of 2)

(

"A"

Troubleshooting - 4

MEASURE

120 VAC

DC RAIL J444-1 TO

OUTPUT

TERMINALS

DC RAIL LED

ON?

YES

MEASURE

J444-3

503 +/-4 VDC

YES

MEASURE

120 VAC

A9TP501 TO

A9TP502

YES

VOL TAG E IS W ITH IN

PERFORM VERIFICATION &

CALIBRATION AS REQUIRED

YES

MEASURED

SPEC?

DISCONNECT CABLE FROM A9E527 (OUTPUT BOARD)

TO J627 (INVERTER BOARD)

CHECK OUTPUT RELAY A9K500, A9Q501, D501

OUTPUT_RELAY (HI) @ A10J524-45 OUT_RELAY (HI) @ A10J821-22

IF THESE SIGNALS DO NOT TOGGLE WITH OUTP ON -

PROBLEM WITH A1 FRONT PANEL OR A8 DSP BOARD

YES

DC RAIL LED

PROGRAM "OUTPUT OFF" CONNECT LOAD RESISTOR (20 OHMS) AND CURRENT SHUNT ACROSS OUTPUT TERMINALS PROGRAM "OUTPUT ON" "CURRENT 5.00"

ON?

YES

OUTPUT

CURRENT @ 5A

WITHIN SPEC CC

MODE?

GO TO A7 INVERTER

TROUBLESHOOTING

GO TO A3 FET/A5 DC RAIL

TROUBLESHOOTING

MEASURE

~3.5 Vpp SINEWAVE

@ A10J822-5

CONTROL

BOARD

YES

CHECK

PULSES AT

A10U1801-25

FIG X-X

YES

IF FAULT IS VOLTAGE OR CURRENT READBACK CHECK

OUTPUT AND CONTROL BOARDS

IF FA ULT IS TRIG IN, T RIG O UT, R I OR D FI GO TO A 11

TRIGGER BOARD TROUBLESHOOTING IF FAULT IS NO OUTPUT CHECK A7 INVERTER BOARD

Figure 4-1. Overall Troubleshooting Procedures (sheet 2 of 2)

GO TO A8 DSP

TROUBLESHOOTING

GO TO A10 CONTROL BOARD TROUBLESHOOTING

4 - Troubleshooting

A1 Front Panel Assembly Troubleshooting

Figure 4-2. Front Panel Assembly Troubleshooting

A2 GPIB/RS-232 Board Troubleshooting

Table 4-4. GPIB/RS232 Board Troubleshooting

Step Procedure Waveform

Check for +5 Vdc at L100 (see Figure 6-5 for location).

Check for clock waveform at Y100.

Connect the unit to a GPIB or RS232 controller to check the GPIB/RS232 transceivers. Note that GPIB and RS232 use separate communication transceivers.

HP-I B

CRYSTAL

2. 00 V/di v

50.0 ns/div

-250. 0 ns

Troubleshooting - 4

A3 FET Board Troubleshooting

Because test points on the FET board are not accessible when the board is installed, troubleshooting must be performed with the board removed from the power supply. Troubleshooting procedures are provided with both power removed and power applied. The location of different test points are shown by encircled numbers on the A3 FET Board schematic and component location diagrams.

NOTE: If any power FET (Q201-204, Q211, Q222, Q233, or Q244) is defective, you must replace all

eight with a matched set.

Table 4-5. FET Board Troubleshooting

Step Procedure Result

With all power removed

1 Turn the power supply off and remove the A3 FET board with

its heatsink assembly attached (see Disassembly Procedures).

2 Measure the resistance between the +Rail (E502) and the - Rail

(E501) and common (-Rail).

3 Measure the resistance between the gate of each FET (Q201-

204, Q211, Q222, Q233, and Q244) and common (-Rail). 4 Measure the resistance across capacitor C201.

5 Measure the resistance across the 15 V bias input (E506 to

E507).

With signal from external waveform generator applied

6 Short the collectors of Q251 and Q252 by connecting the

collector (case) of each transistor to common (E507). 8 Connect a waveform generator to J200-1 and J200-2. 9 Set generator to produce a 20kHz, 20Vp-p triangular waveform. See Figure 4-3A. 10 Connect 15 V from an external supply to E506 (positive) and

E507 (common).

Note: All of the following measurements are taken with respect

to E507 common (same as TP 26 on A3 FET Board). 11 Check bias voltage at U203-1 (TP 27). +5V 12 While adjusting the external 15 V supply input, check the bias

trip point at U204-1 (TP 28).

13 Set external supply input to + 15V and check drive 1 waveform

at U201-10 (TP 29), and drive 2 waveform at U201-12 (TP 30). 14 Check that pulses are present at U201-1(TP 31), U201-7 (TP

32), U202-1 (TP 33), and U202-7 (TP 34)

15 Pulses should be present on both sides of inductors L201-204

and L213-216 as follows:

Check the pulses on the driver transistor side (Q251-Q254) of

each inductor.

Check the pulses on the FET regulator side (Q201-Q204,

Q211,Q222, Q233, and Q244) of each inductor.

If the waveforms do not have the fast step as shown in Figure

4-3, then the associated FET gate input has an open circuit. 16 Measure the VREF voltage at U204-4 (TP 35). approx. 1.7 V. 17

Check the peak current limit by connecting a 68 kΩ resistor

from +5 V (U201-9) to U204-5.

See Disassembly Procedures

Value should be >20 MΩ

Value should be >15 kΩ

Value should be approx. 150Ω

Value should be approx. 1 kΩ in the forward direction and 490Ω reversed.

Voltage goes from low of 0V to high of 5V at an input of approx. 12V, and from high to low at an input of approx. 13V

See Figure 4-3B.

See Figure 4-3C.

See Figure 4-3D.

See Figure 4-3E.

All pulses turned off.

4 - Troubleshooting

Figure 4-3. FET Assembly Test Waveforms

Troubleshooting - 4

A5 DC Rail Assembly Troubleshooting

CAUTION: This board contains hazardous voltages during some troubleshooting procedures. Use

extreme caution.

Before troubleshooting the A5 DC Rail board, refer to the previous procedure and determine that the A3 AC FET Assembly is good. The 503 Vdc rail (+/-4Vdc) is generated from the 300 Vac input board rail, the A3 FET board, and the power transformer. The A5 DC Rail board contains the PWM and CV error amplifiers for controlling the FET switches. Troubleshooting the bias, PWM, and CU error amplifiers must be done with the 300 Vdc rail disconnected from the A3 FET assembly

DISCONN ECT CABLE FROM A3 FET BOARD TO J1042 ON A4 AC INPUT BOARD.

DISCONN ECT CABLE FROM A9 O UTPUT BOAR D TO J627 ON A7 INVE RTER BOA RD.

REMOVE 5 SCREWS HOLDING A5 DC RAIL BOARD AND HOLD A5 DC RAIL BOARD IN VERTICAL POSITION USING BOARD HOLDERS. JUMPER TP#1 & TP X

TURN ON AC INPUT

START

MEASURE BIAS VOLTAGE S: TP404 = COM MON

MEASURE +10V RA IL_REF @ C454+ = 10.00VDC

EXT_CLK_ISO

THE CV ERROR AMPLIFIER, PWM COMPARATOR, PWM DRIVER, RAMP GENERATOR AND

HV/LOW RAIL DETECT CIRCUIT CAN BE CHECKED BY APPLYING 0V OR 10V TO RAIL_VMON.

CHECK RAMP GENERATOR AT U475-1 AND U 475-7 (SEE FIGURES 4-5C AND 4-5D).

0V applied

+15V

+5V +5V

PULSE

PULSE PULSE PULSE

+5V

10V applied

CV ERROR AMP

-15V PWM COMPARATOR

RAIL_OV_INH

+5V

PULSE

RAIL_INH_ISO

RAMP PULSE

1/2 EXT_CLK_ISO

+5V

PWM DRIVER (disconnected)

PWM DRIVER (normal)

RAIL_OV_INH

RAIL_LOW_W ARN

+1.2V

LRFIN

LRFDEL

TP401 = +15VDC

TP402 = -15VDC TP403 = +5VDC

PWM_EN

@ +5V ?

YES

WAVEFORM

U436-6

OK?

YES

U447-7

U462-7

U463-3 (LOW WHE N RAIL OVER VOLTAGE IS TRUE) U463-4 (HIGH INHIBITS P WM D RIVER)

U463-14 (SEE FIGURE 4-5B) U463-15 (SEE FIGURE 4-5A)

U491-8,9 (SEE FIGURE 4-5E)

U491-8,9 (SEE FIGURE 4-5F)

U424-14 (TOGGLES A T APPROX. 10.6V @ RAIL_VMO N)

U424-14 (TOGGLES A T APPROX. 9.3V @ RAIL_VMO N) U424-1

U433-1

(TOGGLES AT APPROX. 8.4V @ RAIL_VMON)

CHECK U 423 BIAS DETEC T CIRCUIT

PWM_EN WILL INHIBIT A8 DSP BOARD

CHECK EXT_SYNC U436-3 TO X

CHECK E XT_CLK_SYN C A10 J824-1 CONTR OL BOARD

IF SIGNAL NOT PR ESENT @ A10 J824-1, THEN

A10 CONTROL OR A8 DSP BOARD FAULT

Figure 4-4. DC Rail Assembly Troubleshooting

4 - Troubleshooting

(

)

(

)

(

)

(

)

BCD

EXT CL K IS

U436-6

R459

TP404

RAMP

GENERATO

U475-1

R487

TP404

2.00 V/div

83 kHz EXTERNAL CLOCK

2.00 V/div 5.00 us/div

5.00 us/div

RAM

GENERATO

PULSE

R483/R489

TP404

RAMP

GENERATO

U475-

R480

TP404

1.00 V/div

2.00 V/div

5.00 us/div

RAMP PULSE

5.00 us/div

PWM DRIVE

U491 -8

U491 -9

RAIL

DISCONNECT E

FROM AC FET

PULL J1042

C INPUT

SHOR

RAIL LO FAUL

TP#1

RAMP GENERATOR NO. 2

5.00 V/di v 10.00 us/div

PWM DRIVER - AC FET RAIL DISCONNECTE

Figure 4-5. DC Rail Assembly - Test Waveforms

PWM DRIVE

U491-

500 V DC RAIL

DISCONNECTED

FRO

INVERTE

RAMP GENERATOR NO. 1

5.00 V /div

PWM DRIVER - NORMAL OPERATION

5.00 us/div

Troubleshooting - 4

A6 Bias Assembly Troubleshooting

Checking the A6 Bias Assembly consists of checking the bias voltages and the fan speed control circuit.

NOTE: You can determine if any of the bias voltage regulators are operating in current limit mode by

disconnecting the cable going to the circuit where the bias is used. If the bias voltage returns to normal with the cable disconnected, most likely the bias circuit is OK.

Table 4-6. Bias Assembly Troubleshooting

Step Procedure Result

1 Check F301 If open, replace fuse. If fuse blows again, troubleshoot the bias

circuits.

2 Check the bias voltages at the

following locations. Measure at the following points: Test point Common point C314+ and C302- (P) C304+ and C302- (P) C313+ and C317- (H) U312 tab and C317- (H) U311 tab and C317- (H) U322 tab and C329+ (Y) C331 tab and C329+ (Y) E346-2 and D322 (F) E346-1 and D322 (F) E336-2 and E336-3 E336-1 and E336-3

3 Check the fan speed supply by

measuring the voltage at: Test point Common point C361+ and D322 (F) 4.7 Vdc (in AUTO mode)

3 Change the fan speed and check for

the correct voltage as follows: Press 0 and 9 simultaneously. Press p twice, ã once, and ENTER Press 0 and 9 simultaneously. Press p once. Enter a fan speed, then ENTER

4 After the fan speed test, enter the

following command: SHIFT OUTPUT GGGG ENTER

This restores the fan speed to automatic mode.

+12 Vdc (+12V PRI to A4 Input board) +15 Vdc (+15V PRI to A3 FET board) +12 to 15 Vdc (+5V UNREG to U311, U312) +5 Vdc (+5VDC to A1 Front Panel) +5 Vdc (+5V DC to A2 GPIB board) +15 Vdc (+15VSEC to A8 DSP, A9 Output, A10 Control boards)

-15 Vdc (-15VSEC to A8 DSP, A9 Output, A10 Control boards) +25 to 30 Vdc (+25 V UNREG to A7 Inverter, A8 DSP boards) +5 V (+5 V SEC to A7 Inverter, A8 DSP boards) ~22 Vac (~22Vac to dc rail bias regulator) ~44 Vac (~44Vac to dc rail bias regulator)

EE INIT <model> FAN:MODE MAN EE INIT <model> FAN:SPEED <n> 10 = 5.7 Vdc 50 = 9.6 Vdc 100 = 14.6 Vdc

*RST

4 - Troubleshooting

Figure 4-6. Bias Assembly Voltage Distribution

Troubleshooting - 4

(

)

A7 Inverter Assembly Troubleshooting

NOTE: Power FETS 601 through Q608 and Q611 through Q618 should be matched by manufacturer and

date code. If any are replaced, they should be mounted using a torque driver set for 5 inch/pounds.

TURN ON

C SOURCE

10U1801-23

INV

OFF LOW ?

SEE FIG 6-18

YES

CHECK FOR PWM SIGNALS

T PWM DRIVE A10U1801-25.

SEE FIG 4-8A

10U1801-25

PWM SIGNAL

PRESENT?

YES

TURN UNIT OFF. REMOVE

FROM OUTPUT A7J627

TURN UNIT ON

CHECK Q601 THRU Q608 AND Q611 THRU Q618 GATE SIGNALS, SEE FIG 4-8B, 4-8C.

CHECK Q627, Q629, Q637 AND Q639 DRAIN PULSE, SEE FIG 4-8D.

CHECK Q633, Q635,Q641 AND Q643 DRAIN PULSES, SEE FIG 4-8E.

J625).

TROUBLESHOOT A8DSP/A1 0

CONTROL ASSEMBLIES

WAVEFORMS

OK?

YES

. CONNECT EXTERNAL 30 VDC TO J627 (+ TO J627-1) (- TO J627-2

B. REMOVE CABLE(S) TO J526 AND J527 ON A9 OUTPUT BOARD

C. CONNECT OSCILLOSCOPE TO J526 AND OBSERVE WAVEFORM FIG 4-8F

D. IF WAVEFORM IS NOT CORRECT

E. IF WAVEFORM IS CORREC T CHECK A9 OUTPUT BOARD FIL TER

GO TO "A” ON NEXT SHEET.

"A"

Figure 4-7. Inverter Assembly Troubleshooting (sheet 1 of 2)

4 - Troubleshooting

REMOVE A7 INVERTER ASSEMBLY CHECK FOR CRACKED OR BROKEN FETS, BURN MARKS ON PC BOARD. IF BROKEN FETS OR BURN MARKS ARE OBSERVED REPLACE A7 INVERTER ASSEMBLY. APPLY +20VDC @ J638-2 AND +5VDC@J638-1 J638-34 IS COMMON OR USE "SLOW START" PROCEDURE. SEE STEP "E" BELOW AND LAST PAGE OF A7 TROUBLESHOOTING SECTION

"A"

+12VDC @

U619-2 & U620-2 ?

TROUBLESHOOT +12 VDC BIAS

YES

U621-6 LOW ?

TROUBLESHOOT Q644 & U621

PCLR CIRCUITS

YES

U607-1 &

U609-1

HI ?

TROUBLESHOOT U602, Q619 &

INN_OFF CIRCUITS

YES

A. USE 8-PIN DIP TEST CLIP TO CONNECT FOLLOWING TEST EQUIPMENT

1. CONNECT FUNCTION GENERATOR 83 KHZ SQUARE WAVE TO U602-3 & U602-4

2. SHORT U602-5 TO U602-7. OPTO MUST BE LOW FOR U608 TO GENERATE TURN-ON PULSES. B. CONNECT OSCILLOSCOPE TO U608-2 AND INCREASE FUNCTION GENERATOR GAIN UNTIL 83KHZ SQUARE WAVE IS OBSERVED AT U608-2. SEE FIG 4-8 G. NOTE; FUNCTION GENERATOR IS

CONNECTED DIRECTLY TO U602 OPTO DIODE. BE SURE FUNCTION GENERATOR HAS INTERNAL IMPEDANCE OF 50 OHMS. C. CHECK GATE DRIVE TO ALL POWER FETS Q601 THRU Q608 AND Q611 THR Q618 SEE FIG 4-8H.

D. CHECK WAVEFORM AT "H" BRIDGWE OUTPUT E626-1 TO E626-2 AND E627-1 TO E627-2. SEE FIG 4-8H E. IF ALL WAVEFORMS ARE CORRECT REINSTALL A7 INVERTER ASSEMBLY. CONNECT ALL CABLES EXCEPT 503 VDC RAIL. CONNECT EXTERNAL DC SOURCE TO A7J627. SEE "A7 SLOW START" PRODEDURE. F. CHECK CURRENT WAVEFORM FIG 4-8J. PROGRAM AND CHECK OUTPUT VOLTAGE AND CURRENT TO

DETERMINE IF A7 INVERTER ASSEMBLY IS OPERATING PROPERLY.

Figure 4-7. Inverter Assembly Troubleshooting (sheet 2 of 2)

Troubleshooting - 4

A10U1801-2 5

PWM DRIVE

SCOPE

DC COUPLED

GATE TO -RAIL

1.00 V/di v

5.00 V/di v 2.00 us/di v

2.00 V

0.00 V -18.00 us

5.00 us/di v

0.00 s

SCOPE

DC COUPLED

GATE TO -RAIL

SCOPE

DC COUPLED

DRAIN TO -RAIL

5.00 V/div

0.00 V

2.00 us/di v

-18.00 us

2.00 us/div

0.00 V -16.00 us

SCOPE

DC COUPLED

DRAIN TO -RAIL

5.00 V/div

2.00 us/div

0.00 V -16.00 us

J526

J527

EXTERNAL

30 VDC

TO J627

OUTPUT ON

20.00 V/di v

0.00 V

2.00 us/di v

Figure 4-8. Inverter Assembly - Test Waveforms (sheet 1 of 2)

8.00 us

4 - Troubleshooting

U608-2

E626-1/E 627-1

E626-2/E 627-2

EXTERNAL

30 VDC

TO J627

2.00 V/div

10.00 V/div

2.00 us/d iv

0.00 V 5.040 us

2.00 us/div

0.00 V 5.0 40 us

GATE TO

1 mA/mV INVERTER CURRENT EXTERNAL

30 VDC

TO J627

OUTPUT OFF

5.00 V/div

200 mV/div

2.00 us/div

0.00 V 5.040 us

5.00 us/d iv

0.00 V -25.00 us

Figure 4-8. Inverter Assembly - Test Waveforms (sheet 2 of 2)

Troubleshooting - 4

Slow-Start Procedure

Perform the overall A7 inverter troubleshooting documented in Figure 4-7 before you perform the slow-start procedure.

The A7 Slow-Start troubleshooting procedure allows testing the A7 inverter assembly and A10 control assembly voltage and current loops using an external DC power supply in place of the AC source 500 Vdc rail. Service Kit 5063-2330 will be required to perform both procedures.

1. Turn off the UUT ( AC source ) and remove cable 06813-80005 from A7-J627. This cable disconnects the 500 Vdc rail from the A7 Inverter assembly.

WARNING: SHOCK HAZARD. Unless you perform step #2, the 500 Vdc rail will still be present on the

A5 dc rail assembly during the slow-start procedure.

2. To disable the 500 Vdc rail during the following tests, disconnect cable 5080-2365 from A5-J400. This will remove the PWM drive to the A3 AC FET assembly and disable the 500 Vdc rail. Then connect a jumper from A5-J445-4 to A5-J445-10. This disables the RAIL_LOW_FAULT signal and allows the DSP assembly to function.

3. Use the extender board from the service kit and raise the A8 DSP and A10 Control assemblies from the unit. Verify that the A8 and A10 assemblies are functioning properly. Refer to the A8 DSP and A10 Control assembly troubleshooting procedures.

4. If the A8 DSP and A10 Control assemblies check good, turn off the unit and re-install the A8 and A10 assemblies in the unit.

5. Using cable 5080-2381 supplied in the service kit connect an external ( 60V/2A minimum ) DC power supply to the A7 Inverter assembly A7-J627.

6. Turn on the unit and DC power supply.

7. Set the external DC supply for 0 volts and 2 amps current limit.

8. Slowly increase the external DC supply voltage to 60 Vdc observing the current from the external supply. The external supply should go to 60 Vdc with only 200 to 300 milliamperes current from the external supply. If the current raises immediately check for shorted FETs on the A7 Inverter assembly.

9. Connect an oscilloscope to the unit's output terminal block. Enable the output. Using the front panel knob, increase the output voltage while observing the oscilloscope. A harmonic free sine wave should appear on the oscilloscope until the output voltage reaches approximately 30-35 volts. At this time the sine wave will develop a flat top. This test verifies the voltage control loop.

10. Disable the output and connect a load resistor ( 20 ohms ) capable of sinking 1.5 to 2 amps to the output terminals of the unit.

11. Enable the output and set CURR:LEV to 1 amp. The unit should current limit at 1 ampere and the CC annunciator should come on. The response of the RMS ( CURR:LEV ) loop is slow so you will have to wait a moment. Set the CURR:LEV to 3 amps and set CURR:PEAK to 1 amp. Both the CV and CC annunciators should come on. These tests verify both the RMS and PEAK current loops.

12. If the A7 Inverter assembly passes the above tests, the voltage and current PWM loops are functioning properly. If the A7 assembly fails when the internal 500 Vdc rail is applied it may be due to high voltage breakdown on either FETs or capacitors on the A7 assembly or the A9 output assembly.

4 - Troubleshooting

A8 DSP and A10 Control Assembly Troubleshooting

WARNING: When troubleshooting the A8 DSP board and the A10 Control board, disconnect the 500V

dc rail between the A9 Output board and the A7 Inverter board by disconnecting the cable from J627. Also, place an insulator over the DC Rail board.

NOTE: To troubleshoot the A8 DSP board and the A10 Control board, it is recommended to use the

extender board from Service Kit 5063-2330. The extender raises the A8 and A10 boards from the unit to access the J822/J722 and the J864 connectors.

Table 4-7 lists the general troubleshooting procedure. All analog voltage levels or digital signals can be generated using the front panel keypad. Use an oscilloscope to easily distinguish the ac rms measurements from the dc measurements. Tables 4-8 and 4-9 describe the expected input/output signals between the DSP and the Control boards.

Table 4-7. DSP/Control Assembly Troubleshooting

Step Procedure Result

With the cable to J627 disconnected

1 To check the J822 analog voltages, enter the following

commands from the front panel: VOLTAGE VOLT 300 ENTER OUTPUT ON

2 To check the J822 offset voltages, enter the following

commands from the front panel:

SHIFT OUTPUT OUTP:COUP DC ENTER VOLTAGE OFFSET 425 ENTER OUTPUT ON VOLTAGE OFFSET -425 ENTER SHIFT OUTPUT *RST ENTER

With the cable to J627 connected so that the ac source can output voltage and current

3 Enter the following commands from the front panel:

VOLTAGE VOLT 300 ENTER OUTPUT ON VOLTAGE ALC:DET RMS ENTER VOLTAGE VOLT 0 ENTER SHIFT OUTPUT *RST ENTER

With a short across the output terminals

4 Enter the following commands from the front panel:

VOLTAGE VOLT 5 ENTER OUTPUT ON SHIFT CURRENT CURR:LEV 4 ENTER SHIFT OUTPUT *RST ENTER

Remove the short from across the output terminals

J822-31 -3.8 Vdc J822-32 -0.8 Vdc J822-23 +1.0 Vac J822-22 +5.0 Vdc J822-15 -4.0 Vdc J822-20 -15.0 Vdc J822-13 +6.0 Vdc J822-18 +15.0 Vdc J822-9 -2.5 Vdc J822-16 -1.5 Vdc J822-5 +3.0 Vac J822-12 -5.0 Vdc J822-1 0 Vac J822-10 +6.0 Vdc

J822-8 +5.0 Vdc J822-6 +6.0 Vdc

J822-9 -4.6 Vdc (for +425 Vout) J822-9 near 0 V (for -425 Vout)

J822-1 3 Vac J822-12 -3.0 Vdc J822-12 near 0 V

J822-3 -0.75 Vac J822-3 -0.23 Vac

Troubleshooting - 4

Table 4-8. Voltage Measurements at J822 (viewed from circuit side of A10 control board)

range signal pin pin signal range

5 to 0.02V waveform trim 33 34 Z inductance program

0.8 to 4.9V ,normally 3.8V HS_MON 31 32 fan monitor 0.5 to 2V(0 - 100% fan

0V = 0A out; 4.9V = 85A out I_MON_RMS 29 30 VA monitor 0 to 4.98V

-2.5 to 2.4V ramp trim 27 28 8-bit DAC common

Z DAC reference 25 26 Z resistance program

See bias troubleshooting FAN_PROG 23 24 DC trim -2.5 to 2.4V

-2.5 to 2.5V rms voltage trim 21 22 OV program 5 to 0.02V = 448 to 2V pk

bias common 19 20 -15V bias

rms current common 17 18 +15V bias

0V = 0A out; -4.99V = 13A

out

0 to 5V rms voltage modu 13 14 rms voltage prog. common

-4.99 to 0V =

-425V to +425V out

waveform ampl. common 7 8 waveform DC offset 0 to 5V

0V = 0V out; 3V = 300V out WFAC_PROG 5 6 waveform ac modu 0 to 5V

-5 to 4.99V ac/dc = full current output

-5 to 4.99V ac/dc =

+/-425Vdc or 300Vac

I_RMS_PROG 15 16 I_PEAK_PROG -4.99Vdc =

DC program common 11 12 V_RMS_PROG 0V = 0V out; -3V = 300V

WFDC_PROG 9 10 waveform DC modu 0 to 5V

current monitor 3 4 current monitor common

voltage monitor 1 2 voltage monitor common

-0.1 to 2.5V = 20 to 1000 µH

speed)

normally 0.7 to 1V

0 to 2.5V = 0 to 1Ω

out

0 to 40 or 80Apeak out

out

ALC:RTIME = always -4.9V

4 - Troubleshooting

Table 4-9. Voltage Measurements at J821 (viewed from circuit side of A10 control board)

range signal pin pin signal range

hi SUB_A2 33 34 DDS down

hi SUB_A0 31 32 SUB_A1 normally hi

+5 volt bias 29 30 digital common (D10 & X)

normally hi; low true RESET 27 28 INPUT_RELAY 1.5V @ 10 seconds after

normally low SUB_ENB 25 26 PCLR normally hi; low true

ALC:INT = low;

ALC:EXT = hi

normally hi; low true INHIBIT 19 20 PROT_CLEAR pulses hi @ PROT CLEAR

normally low; hi true RAIL_INHIBIT 17 18 IPCL_Test

normally low VA_LIMIT 15 16 REG_FAULT normally hi

normally hi; low true SOA_FAULT 11 12 SPARE_IN

normally low; hi true RAIL_LO_FAULT 9 10 RAIL_LO_WARN not used

normally hi; low true DIODE_R_PCLR 7 8 RAIL_HI_FAULT normally low; hi true

hi when CC true CL_RMS 3 4 CL_PEAK normally high;

normally low; hi true OVP_FAULT 1 2 CV_LEVELING RMS = hi; RTIME = low

SENSE_RELAY 23 24 SUB_D normally low

+5 volt bias 21 22 OUTPUT_RELAY output enabled = 4.95 V

digital common (D10) 13 14 AC_FAULT_MODE normally low

digital common (D10) 5 6 CV_REALTIME RMS = low; RTIME = hi

power-on

output disabled = 2 mV

pulsing low true

A9 Output/Filter/Relay Assembly Troubleshooting

START

TURN UNIT ON. CONNECT

OSCILLOSCOPE PROBE TO

A9TP500. OBSERVE WAVEFORM.

Troubleshooting - 4

WAVEFORM OK?

(SEE FIGURE)

PROGRAM VOLT 300

OUTPUT ON

U500-6

3 VAC?

PROGRAM OUTPUT OFF. CONNECT A 20 OHM LOAD. PROGRAM CURR 10 OUTPUT ON

UNIT IN CC

CURRENT

10 AMPS

CHECK IMON, VMON, and I_L_MON

SIGNALS AT A10 CONTROL BOARD.

YES

CHECK U506 AND ASSOCIATED

CIRCUIT COMPONENTS

CHECK U500 RELAY 501

VOLTAGE DRIVER RESISTORS

U500-6 ~/=OUTPUT VOLTAGE *0.01

CHECK U502 AND ASSOCIATED

COMPONENTS .

U502-6 ~/=OUTPUT *0.0566

500 mV/div 5.00 us/div

9TP500

Figure 4-9. Output/Filter/Relay Troubleshooting

4 - Troubleshooting

A11 Trigger/BNC Board Troubleshooting

Table 4-10. Trigger/BNC Board Troubleshooting

Step Procedure Result

Communications Troubleshooting

1. Turn on unit with no voltage or current programmed, and the output off. Use an oscilloscope and check for pulses at U150-1, U151-5, U153-3, and U154-1.

Trigger Out Troubleshooting

1. Connect an oscilloscope to the Trig Out BNC and enter the following front panel commands:

SHIFT OUTPUT TTL:STATE ON ENTER TRIGGER CONTROL INIT:CONT ENTER

Then enter SHIFT TRIGGER.

2. If no output is observed, trace the signal from the A8 DSP board at: A11 U165-12

A11 U157-12/U165-13 A11 U165-12/U164-10 A11 U164-11

Trigger In Troubleshooting

1. Connect an oscilloscope to the Trig Out BNC and enter the following front panel commands:

SHIFT OUTPUT TTL:STATE ON ENTER TRIGGER CONTROL INIT:CONT ENTER TRIGGER CONTROL TRIG:SOUR EXT ENTER

Then short the Trig In BNC (pull low).

2. If no output is observed, trace the signal from the A8 DSP board at: A11 U165-12

A11 U157-12/U165-13 A11 U165-12/U164-10 A11 U164-11

RI (Remote Inhibit) Troubleshooting

1. Enter the following front panel commands: VOLTAGE VOLT 100 ENTER OUTPUT ON

2. Short the RI terminals together (J113-3 to J113-4). Ouput goes to 0 Vac; Output relay opens;

3. If the output does not disable, trace the signal from the A8 DSP board at the following locations: A11 U165-6 A11 U161-5

DFI (Discrete Fault Indicator) Troubleshooting

1 Connect a +5 Vdc source to the DFI terminals via a

5K resistor.

2 Connect a controller to the GPIB connector and send

the following GPIB commands:

OUTPUT 705;”OUTP:DFI ON” OUTPUT 705;”OUTP:SOUR:QUES” OUTPUT 705;”STAT:QUES:ENAB 512”

See Figure 4-10A, B, C, D. As long as waveforms are similar, communications are OK. A problem exists if waveforms never go high or low.

Check for a trigger output pulse every time the SHIFT TRIGGER command is entered (see Figure 4-10E).

Negative pulse (referenced to H common) Positive pulse (referenced to H common) Positive pulse (referenced to D common) Negative pulse (referenced to D common)

Check for a trigger output pulse every time the Trig In BNC is shorted (see Figure 4-10E).

Negative pulse (referenced to H common) Positive pulse (referenced to H common) Positive pulse (referenced to D common) Negative pulse (referenced to D common)

100 Vac at the output terminals

PROT annunciator comes on

Normal RI Shorted LOW HI HI LOW

See Figure 4-10F.

Troubleshooting - 4

Table 4-10. Trigger/BNC Board Troubleshooting - continued

Step Procedure Result

3 Connect a voltmeter between J113-1 and J113-2. Voltmeter should read +5 Vdc

4 Short the RI terminals together (J113-3 to J113-4). Voltmeter should read LOW (<0.07 Vdc)

5 Enter the following front panel commands:

SHIFT STATUS QUES:EVEN? ENTER

6 If J113-1 does not go low, trace the signal from the

A8 DSP board at the following locations: A11 U164-13/U165-3 A11 U164-12/U165-4

Voltmeter should read HIGH (+5 Vdc)

Normal DFI True +5 Vdc LOW LOW +5 Vdc

A. U150-1 (DRXT)

C. U153-3 (ATXD)

2.00 V/div

E. TRIGGER OUT PULSE

10.00 us/div -50.00 us

Figure 4-10. Trigger/BNC Assembly - Test Waveforms

B. U151-5 (DTXD)

D. U154-1 (ARXD)

J113-1

J113-2

F. DFI TEST SETUP

+5V

4 - Troubleshooting

Initialization

NOTE: Initializing the unit erases all calibration, waveform, and list data

Instruments that are being initialized for the first time or have suffered non-volatile memory corruption should be initialized with the front panel EEINIT command. To initialize the unit perform the following:

1. Turn the unit on, then do the front panel CAL ON command.

2. Press 0 and 9 keys simultaneously, EEINIT <model> should now be displayed.

3. Scroll to the correct model number and press ENTER.

If the command is successful, the front panel display will go through a normal power-on sequence.

ROM Upgrade

Identifying the Firmware

The model number, then firmware revision is displayed on the front panel for approximately 10 seconds when AC line switch is turned on. The firmware revision is also accessible via the GPIB using the *IDN? query. The following sample Agilent BASIC program does this.

10 ALLOCATE L$[52] 20 OUTPUT 705;"*IDN?" 30 ENTER 705;L$ 40 DISP L$ 50 END

The computer will display the string "AGILENT TECHNOLOGIES",<model >,0,<revision>".

Upgrade Procedure

It is possible to update to newer ROM versions without destroying the calibration data. To update the unit to newer ROM revisions perform the following.

1. Turn input power off, remove the old ROMs and install the new ROMS.

2. Turn the unit on, then do the front panel CAL ON command.

3. Press 0 and 9 keys simultaneously, then scroll to the ROMUPD command.

4. Scroll to the correct model number and press ENTER.

If the command is successful, the front panel display will go through a normal power-on sequence. If "OUT OF RANGE" error is displayed, then the instrument will have to be re-initialized with the EEINIT command and recalibrated. This can occur if the instrument was previously initialized with a QA firmware revision ( QA.xx.xx ), or if non-volatile memory has become corrupted for any reason.

Troubleshooting - 4

Post-Repair Calibration

Calibration is required annually and whenever certain components are replaced. If components in any of the circuits listed below are replaced, the supply must be re-calibrated as described in Appendix B of the User's Guide.

a. A8 DSP Assembly

b. A9 Output Filter/Relay Assembly

c. A10 Control Assembly

If the A8 DSP Assembly is replaced, the supply must be initialized first (see "Initialization" previously discussed in this chapter) and then be calibrated.

Inhibit Calibration Switch

If "CAL DENIED" appears on the display when calibration is attempted, or if error code 401 occurs when calibrating over the GPIB, the internal INHIBIT CAL switch has been set. This switch setting prevents unauthorized or inadvertent power supply calibration. You must reset this switch in order to calibrate the supply.

The internal calibration switches are located on the A8 DSP board and are accessible by removing the top cover, inner cover then lifting the A10 control board and A8 DSP board assembly. Switches 1 and 2 set the calibration configuration. The three switch positions are illustrated as follows:

Figure 4-11. Calibration Switches

Normal This is the default switch position. The calibration functions are accessible after entering a numeric password. The default password is 0 and is changeable by the user.

Clear Password The calibration password is reset to 0 and the remote programming language is set to SCPI. This option is useful if the user has forgotten the password.

Inhibit Cal In this position the calibration of the power source cannot be changed. All calibration commands are disabled. If the CAL ON command is sent with the switch in this position an Out Of Range error will be displayed on the front panel. This option is useful in installations where calibration access is guarded by instrument seals.

4 - Troubleshooting

Disassembly Procedures

The following paragraphs provide instructions on how to disassemble various components of the ac source. Once disassembled, the components can be reassembled by performing the disassembly instructions in reverse order. Figure 4-12 shows the location of the major components of the unit.

Figure 4-12. Component Locations

WARNING: SHOCK HAZARD. To avoid the possibility of personal injury, turn off AC power and

disconnect the line cord before removing the top cover. Disconnect the GPIB cable, any loads and remote sense leads before attempting disassembly.

CAUTION: Most of the attaching hardware is metric. Use of other types of fasteners will damage threaded

inserts. Refer to list of required tools when performing disassembly and replacement.

Troubleshooting - 4

List of Required Tools

a T10, T15 and T25 Torx screwdrivers.

a Allen wrench 0.050 inch.

a 2PT. Pozidriv screwdriver.

a #2 Phillips screwdriver.

a 3/16 inch flat blade screwdriver.

a 7mm and 10mm Hex drivers

a 5/8 inch Hex driver or box wrench

a Static free workstation and antistatic wrist discharge strap.

Top Cover ( outer cover ) Removal

a. Using a T25 Torx screwdriver remove the screws holding the carrying straps on each side of the AC source.

Total of 4 screws.

b. To remove, slide cover toward rear of unit to disengage it from front panel, spread bottom of cover to lift it from

the unit.

c. When replacing the outer cover carefully align front of cover with front frame and rear bottom corners with

rectangular blocks mounted on the chassis.

Inner Top Cover Removal

a. Using a T15 Torx screwdriver remove 4 screws holding the top of the inner cover, 3 screws holding the left side

and 4 screws holding the right side.

b. Lift the inner cover straight up and off the unit.

A1 Front Frame / Panel Assembly Removal and Replacement

a. Remove the top cover as described earlier.

b. Locate and carefully peel off the vinyl trim strips (one on each side of the frame ) to gain access to the side

screws the secure the front frame to the chassis.

c. Using a T10 Torx screwdriver remove 2 screws from each side of the front frame.

d. Move the front frame forward a few inches and disconnect the phone type cable from connector A1J6 located on

the front panel PC board.

e. Move the right side of the front frame forward, pivoting on the left corner to gain access to S1 on / off switch.

f. Disconnect the wires going to switch S1 noting the color code of the wires and the respective switch terminals to

which they connect for subsequent reconnection.

g. The front frame can now be removed from the AC source.

h. To remove the PC board from the front frame, use a T10 Torx to remove the screw. Find the PC board finger

that keeps the PC board from sliding in the direction of switch S1. Lift the PC board finger, slide the PC board off the plastic fingers and remove the PC board from the frame.

j. To reinstall the front panel PC board and front frame perform the above steps in reverse order.

4 - Troubleshooting

A2 GPIB / RS 232 Board Removal and Replacement

a. Remove the outer and inner top covers as described earlier.

b. Remove the two ( 2 ) 7 mm Hex screws that hold the GPIB connector place.

c. Using a T15 Torx screwdriver remove the screw holding the PC board to the rear chassis.

d. Disconnect the phone type cable from J112.

e. To reinstall the A2 GPIB PC board perform the above steps in reverse order.

A3 AC FET Assembly Removal and Replacement

a. Remove the outer and inner top covers as described earlier.

b. Remove DC rail cable from A4J1042 on AC input board.

c. Remove bias cables between A3J200 and A5J400 on A5 DC rail board and from A6J339 on the A6 bias board.

d. Lift fan straight up from unit and rest on A5 DC rail board.

e. Remove Litz wire cables from power transformer that connect to TB201 on A3 assembly.

f. Use T15 Torx screwdriver to remove screw holding A3 ACFET assembly to rear panel.

g. Slide A3ACFET assembly toward front of AC source and lift assembly up and out of unit.

h. To reinstall the A3 ACFET assembly, perform the above steps in reverse order.

A4 AC Input Board Removal and Replacement

a. Remove the outer and inner top covers as described earlier.

b. Remove the A2 GPB board as described earlier.

c. Remove the A3 ACFET assembly as described earlier.

d. Use 10mm Hex driver to disconnect ground wire connected to rear panel, located under A2 GPIB board.

e. Remove red and black wires going to line choke.

f. Remove cable between J1035 and J335 on A6 Bias board.

g. Using a T15 Torx screwdriver, remove 3 screws holding A4 AC Input board to chassis.

h. Slide A4 AC Input board toward the front of the unit and lift from chassis.

j. To reinstall the A4 AC Input board perform the above steps in reverse order.

A5 DC Rail Board Removal and Replacement

a. Remove the outer and inner top covers as described earlier.

b. Disconnect cables at J436, J400, J444 and J445.

c. Using T15 Torx screwdriver remove 5 screws holding A5 DC rail board to chassis.

d. Disconnect cable to J1232 or J1233 on power transformer board. Mark which connector the cable was removed

from.

e. Disconnect wires from rail choke 5080-2329 at A5 DC rail board. The A5 DC rail board is labeled with wire

color code.

f. To reinstall the A5 DC rail board perform the above steps in reverse order taking care to reconnect the rail

choke wires to the correct terminals and the power transformer cable to the correct receptacle.

Troubleshooting - 4

A6 Bias Board Removal and Replacement

a. Remove the outer and inner top covers as described earlier.

b. Remove A5 DC rail board as described earlier.

c. Disconnect cables from J306A, J306B, J335, J337, J339 and J343.

d. Disconnect wires going to S1 on/off switch. Record where wires terminate at switch.

e. Using T15 Torx screwdriver remove 1 screw holding A6 bias board to chassis.

f. Using 2PT posidrive screwdriver remove 4 screws holding bias transformer and A6 bias board to chassis.

h. Slide A6 bias board to the left and lift from chassis.

j. To reinstall the A6 Bias board perform the above steps in reverse order.

A7 Inverter Assembly Removal and Replacement

a. Remove outer and inner top covers as described earlier.

b. Lift fan out of chassis and rest on A5 dc rail board.

c. Disconnect cables to J526 and J527 on A9 output board.

d. Disconnect cables to J627 from A9 output board and J638 from A6 bias board.

e. Disconnect cables to J828 and J855 on A10 control board.

f. Disconnect cable at J444 on A5 DC rail board to help in removal of A7 Inverter assembly.

g. Using T15 Torx screwdriver remove screw holding A7 Inverter assembly to rear chassis.

h. Slide A7 Inverter assembly toward front of unit and lift from chassis.

j. To reinstall the A7 Inverter assembly perform the above steps in reverse order.

A8 DSP Board and A10 Control Board Removal and Replacement

a. Remove outer and inner top covers as described earlier.

b. Disconnect cable from A7 Inverter assembly to J746 on the A8 DSP board.

c. Disconnect cables to J828 and J855 on A10 control board.

d. Disconnect cable to J115 on the A11 Trigger board.

e. Using T15 Torx screwdriver remove 3 screws holding A10 Control board to right side of chassis.

f. Lift A10 Control board from chassis.

g. Using T15 Torx screwdriver remove 6 screws holding A8 DSP board to A10 Control board.

h. To reinstall the A8 DSP and A10 control boards perform the above steps in reverse order.

4 - Troubleshooting

A11 Trigger ( BNC ) Board Removal and Replacement

a. Remove outer and inner top covers as described earlier.

b. Disconnect cable from A10 control board to J115.

c. Disconnect cables to J106 and J112. Mark cables to J106 and J112 before removing. If the cables are reversed

during replacement, the ac source will not pass turn-on self test.

d. Use 5/8 inch socket/box wrench to remove nuts holding BNC connectors to rear panel.

e. Remove A11 Trigger board from unit.

j. To reinstall the A11 Trigger ( BNC ) board perform the above steps in reverse order

A9 Output Board Removal and Replacement

a. Remove outer and inner top covers as described earlier.

b. Remove A7 Inverter assembly, A8 DSP, A10 Control and A11 Trigger boards as described earlier.

c. Disconnect cable going to J337 on the A6 bias board.

d. Disconnect cable going to J445 on the A5 DC rail board.

e. Using T15 Torx screwdriver remove 4 screws holding A9 output board to chassis.

f. Slide A9 output board toward the front of the unit and lift from chassis.

g. To reinstall the A9 output board perform the above steps in reverse order

Replaceable Parts List

Introduction

This section lists the replaceable electrical and mechanical parts for the Agilent Series 6611A/B, 6612A/B, 6613A/B AC Power Source/Analyzers, and Agilent Series 6841A, 6842A Harmonic Flicker Test Systems.

Reading the Tables

Each table lists electrical components alphabetically by reference designator and provides the Agilent part number followed by the part description. Mechanical parts are placed after the electrical parts and listed alphabetically by part description. Unless otherwise specified, a listed part is used in all models of the series. Model-specific parts are tabulated by model number under the reference designator.

Note that the word “All” in the Applicability column in any of these tables means that the item is applicable to all models.

Part Reference Designators

A assembly K relay T transformer B blower (fan) L inductor TB terminal block C capacitor M mechanical U integrated circuit CR thyristor/SCR P plug VR voltage regulator D diode Q transistor W cable or jumper DSP display (LCD) R resistor Y crystal oscillator F fuse RT thermal resistor J jack SW switch

Part Description Abbreviations

assy assembly m metric PCB PC board W/ with bd board mch machine sq square w/o without gnd ground mm millimeter submin subminiature xfmr transformer lg long mtg mounting thrd thread xtal crystal

How to Order Parts

You can order parts from your local Agilent Technologies Sales and Support Office. When ordering a part, please include the following information:

the Agilent part number

the part description

the model number of the unit.

5 - Replaceable Parts

1 at

Table 5-1. Parts List for Main Assembly

Ref Desig.

Al1 A2 A3 A3 A4 A4 A4 A5 A6 A6 A7 A8 A8 A9 A9 A10 A10 A10 A11 A12 T1

M11 All 5040-1702 KEYPAD - AC SOURCE M21 All 5040-1703 FRONT FRAME M31 All 5080-2333 WINDOW M41 All 5001-6795 FRONT PANEL LABEL M51 All 0370-3238 KNOB 6mm M61 6811A

Refer to

Figure 5the end of this chapter for location information.

Applicability Agilent Part No. Description

TESTED CIRCUIT BOARD ASSEMBLIES All All 6811A/B,6812A/B,6841A 6813A/B,6842A 6811A/B 6812A/B,6841A 6813A/B,6842A All 6811A/B,6812A/B,6841A 6813A/B,6842A All 6811A,6812A,6813A 6811B, 6812B,6813B,6841A,6842A 6811A/B 6812A/B,6813A/B,6841A,6842A 6811A/B 6812A/B,6841A 6813A/B,6842A All All All

5060-3596 5063-2376 06812-61001 5063-2316 06811-61020 06812-61020 06813-61020 5063-2313 06812-61021 06813-61021 5064-0110 5063-2315 5063-2367 06811-61022 5063-2314 5063-3482 5063-2369 5063-2370 5060-3597 5060-3590 9100-5145

Front Panel Board Tested GPIB/RS-232 Board Tested AC FET Board Tested AC FET Board Tested AC Input Board Tested AC Input Board Tested AC Input Board Tested DC Rail Board Tested Bias Board Tested Bias Board Tested Inverter Board Tested DSP Board Tested DSP Board Tested Output/Relay/Filter Board tested Output/Relay/Filter Board Tested Control Board Tested Control Board Tested Control Board Tested Trigger (BNC) Board Thermistor Board Power Transformer Assembly

MECHANICAL PARTS

6811B 6812A 6812B 6813A 6813B 6841A 6842A All All All All All All All All All All All All All

06811-80001 06811-80007 06812-80001 06812-80003 06813-80001 06813-80006 06841-80001 06842-80001 0360-2190 0360-2191 0515-1085 06813-20001 06813-80002 1252-1488 1400-0493 1400-0611 3101-3088 5001-0539 5001-6745 5001-6799 5001-9801

NAMEPLATE NAMEPLATE NAMEPLATE NAMEPLATE NAMEPLATE NAMEPLATE NAMEPLATE NAMEPLATE JUMPER-BARR BLK CVR-TERM BLK-DC SCREW DC COVER INV HEAT SINK FET PAD INVERTER DFL/RI TERM-BLK- 4 POS CABLE TIE CLAMP-CABLE (rail choke) LINE SWITCH TRIM SIDES,FR GY COVER CHASSIS INVERTER CHASSIS AC FET

Table 5-1. Main Assembly - continued

Ref Desig. Applicability Agilent Part No. Description

All 5001-9803 CHASSIS TOP All 5001-9804 PANEL-REAR All 5001-9805 BRACKET-FAN All 5001-9808 FET CLIP All 5001-9809 BRACKET DC RAIL All 5040-1676 SAF-CVR-AC INPUT All 5040-1697 BLOCK-TOP COVER All 5040-1704 AC SAFETY COVER All 5041-8801 FOOT All 5041-8819 CAP-STRAP HANDLE All 5041-8820 CAP-STRAP HANDLE All 5060-3570 CHASSIS ASSY All 5062-3705 STRAP HANDLE

L1050 All 5080-2328 CHOKE-LINE

All 5080-2329 CHOKE-RAIL All 5080-2339 LABEL-REAR PANEL All 5080-2341 XFMR INSULATOR All 5080-2342 INSULATOR All 5080-2348 CABLE ASSEMBLY All 5080-2353 CABLE ASSEMBLY All 5080-2356 CABLE ASSEMBLY All 5080-2362 ASSY-FAN All 5080-2365 CABLE All 5080-2373 INSULATOR INVERTER All 5080-2380 CABLE ASSEMBLY All 5080-2381 CABLE ASSEMBLY All 5080-2397 CABLE ASSEMBLY All 5062-3977 RACK MOUNT KIT (without handles) All 5062-3983 RACK MOUNT KIT (with handles) All 7120-8214 LABEL-WARNING All 7121-2794 LABEL-ID SN All 9100-5145 XFMR-SWITCH POWER All 8120-5573 PWR CORD OPT 831

6813A/B,6842A 8120-6502 PWR CORD OPT 832 6811A/B 6811A/B 6811A/B 6811A/B 6811A/B 6811A/B 6811A/B 6812A/B,6841A 6812A/B,6841A 6812A/B,6813A/B 6841A,6842A 6813A/B,6842A 6813A/B,6842A 6812A/B,6841A 6812A/B,6841A 6812A/B,6841A 6812A/B,6841A

8120-8605 8120-8606 8120-8607 8120-8608 8120-8609 8120-8610 8120-8611 8120-5568 8120-5566 8120-6505 8120-6505 8120-6506 8120-6507 8120-6508 8120-6509 8120-5567 8120-6511

POWER CORD OPT 900 POWER CORD OPT 901 POWER CORD OPT 902 POWER CORD OPT 912 POWER CORD OPT 903, 918 POWER CORD OPT 904 POWER CORD OPT 917 POWER CORD OPT 833 POWER CORD OPT 834. POWER CORD/PLUG OPT 841 POWER CORD/PLUG OPT 841 POWER CORD OPT 842 POWER CORD/PLUG OPT 844 POWER CORD/PLUG OPT 845 POWER CORD/PLUG OPT 846 POWER CORD/PLUG OPT 847 POWER CORD/PLUG OPT 848

Replaceable Parts - 5

5 - Replaceable Parts

Table 5-2. Parts List for Technical Manuals

Reference Desig. Applicability Agilent Part No. Description

All All All All All All All All All All All All All All

5962-0885 5962-0829 5962-0883 5962-0889 5962-0837 5962-0839 5962-0841 5962-0843 5962-0845 5962-0847 5962-8101 5961-5190 5962-8113 5962-8115

Table 5-3. Parts List for AC Input Board

Reference Desig. Applicability Agilent Part No. Description

ELECTRICAL PARTS

C1010,1011 All 0160-4183 CAP 1000 pF 20% C1012-1016 All 0160-7606 CAP 1uF 275V C1020,1021 All 0160-3969 CAP .015 uF 20% C1022,1023,1080 All 0160-4439 CAP 4700 pF 20% C1040 All 0160-4355 CAP .01uF 10% C1050 All 0160-4065 CAP 1uF 20% C1051,1052 All 0160-7606 CAP 1uF 275V C1060,1061

C1062-1065 C1062-1065 C1066,1067 D1060 All 1906-0389 FWB KPC3506/356

D1061 All 1901-1098 DIO-IN4150 DS1080 All 1990-0517 LED-VISIBLE E1047

E1051 All 66000-60051 ASSY-WIRE KIT F1020

F1020 F1080 All 2110-0098 FUSE 20AM 250V

HS1060 All 1205-0861 HEAT SINK J1035 All 1252-2672 CONN-POST-TP-HDR J1042 All 1251-4781 CONN-UTIL J1047 All 1251-5613 CONN-SGL CONN J1049 All 0360-2421 BARRIER-BLOCK K1040,1041 All 0490-1834 RLY 1C 12VDC L1020

L1020 L1060,1061 All 06012-80095 CHOKE-OUTPUT

Q1040 All 1855-0665 MOSFET RFP 2Nl2L R1010 All 0698-8827 RES 1M 1%.125W R1040,1041,1045,1046 All 0811-3932 RESISTOR-FIXED R1042 All 0698-4150 RES 115 1%.25W R1043,RIO44 All 0698-0092 RES 2.61K 1% R1050 All 0698-3620 RES 100 5% 2W MO R1051 All 0811-1666 RES 1 5% 2W PW R1060,1061,1080,1081 All 0811-1866 RES IOK 1% 5W PW R1082 All 0757-0418 RES 619 1%.125W

/B,6842A

6813A

6811A

/B,6841A

6812A

/B,6842A

6813A

/B,6812A/B,6841A

6811A

/B,6812A/B,6841A

6811A

/B,6842A

6813A

6811A

/B,6841A

6812A

REFERENCE CARD GUIDE-USER GUIDE-QUICK START ENGLISH GUIDE-PROGRAMMING GUIDE-QUICK START FRENCH. GUIDE-QUICK START ITALIAN GUIDE-QUICK START SPANISH GUIDE-QUICK START CHINESE (TAIWAN.) GUIDE-QUICK START KOREAN. GUIDE-QUICK START GERMAN. GUIDE-QUICK START JAPANESE GUIDE-USER JAPANESE GUIDE -QUICK START CHINESE (PRC) GUIDE-USER CHINESE (PRC )

0180-4641 CAP 2700 uF 200V 0180-4528 CAP 1800 uF 200V 0180-4641 CAP 2700 uF 200V 0180-4641 CAP 2700 uF 200V

5060-3586 ASSY-WIRE KIT

2110-0910 FUSE 30AM 500V 2110-0849 FUSE 25AM 250V

06811-80003 CHOKE-INPUT 66000-80004 CHOKE-INPUT

Replaceable Parts - 5

Table 5-4. Parts List for Bias Board

Reference Desig. Applicability Agilent Part No. Description

ELECTRICAL PARTS C300,311,321,350 All 0160-4834 CAP .047 uF 10% C301,328 All 0180-3298 C-F 2200uF 50V C302,313,325,329 All 0180-0230 C-F 1uF 50V C303,304,314,315,317,C326,327,330 All 0180-4129 CAP l uf 35V C312 All 0180-4137 CAP 1200 uf 35V C322 All 0180-4462 CAP 1200 uF 63V C323 All 0180-4398 C-F 470 uf 63V C324 All 0180-3458 CAP 4700 uF 50V C331 All 0180-4131 CAP 4.7 uf 35 V C361 All 0180-4136 CAP l uf 20V D300-303,331-334,351 All 1901-0731 DIO-IN4004/10GO4 D321-324,362-365 All 1901-1087 DIO-PWR 856 D325 All 1901-0992 DIODE 40V 3A D352 All 1901-1098 DIO-IN4150 E334 All 5080-2355 CABLE E336 All 5080-2357 CABLE E338 All 5080-2358 CABLE F300,322,323 All 2110-0688 FUSE 3AM 125V F301 All 2110-0002 FUSE 2AM 250V F311,321 All 2110-0685 FU-SUBMIN 7AM F324,325 All 2110-0699 FU-SUBMIN 5AM F326 All 2110-0712 FU-SUBMIN 4AM HS300,311,312,322,351 All 1205-0350 HEAT SINK HS321,323 All 1205-0282 HEAT SINK J306,314 All 1252-1999 MOD PHONE RCPT J335 All 1252-2672 CONN-POST-TP-HDR J337 All 1251-8139 CONN-POST-TP-HDR J339 All 1252-0063 CONN-POST-TP-HDR J343 All 1252-0055 CONN-POST-TP HDR J353 All 1251-5439 CONN-POST-TP-HDR L321 All 5080-2321 CHOKE-OUTPUT Q351 All 1854-0828 XSTR NPN SI R300,326,329 All 0698-8672 RES 243.4 .1% R301 All 0698-0085 RES 2.61K 1% R311,313 All 0699-0083 RES 681 .1%.IW R314 All 0699-1982 RES 1.055K . 1% R323 All 0757-0279 RES 3.16K 1% R324 All 0757-0280 RES IK 1%.125W R325 All 8159-0005 RES-ZERO OHMS R327,328 All 0757-0281 RES 2.74K 1% R330 All 0699-0208 RES I 5%.25W CF R351 All 0698-3155 RES 4.64K 1% R354 All 0686-2225 RES 2.2K 5% .5W R372 All 0757-0463 RES 82.5K 1% R373 All 0757-0419 RES 681 1%.125W T300 T300 T301 T301 U300,311,312,322 All 1826-0393 IC LM317T U313 All 1826-0147 IC 7812/34OT-12 U321 All 1826-2505 IC LM2576T-ADJT U323 All 1826-0527 IC LM337T U362 All 1990-1074 OPTO-ISOLATOR VR351 All 1902-0955 DIO-ZNR 7.5V 5% VR352 All 1902-0957 DIO-ZNR 9.1 V 5%

/B,6812A/B,6841A

6811A

/B,6842A

6813A

/B,6812A/B,6841A

6811A

/B,6842A

6813A

9100-5143 XFMR-BIAS 9100-5144 XFNR-BIAS 9100-5141 TRANSFORMER-GPIB 9100-5142 TRANSFORMER-GPIB

5 - Replaceable Parts

Table 5-5. Parts List for Inverter Board

Reference Desig. Applicability Agilent Part No. Description

All 5182-9003 Cable - thermistor All 5080-2699 Cable - 3 wire

All 5081-4971 Cable - 4 wire NOTE: Earlier ac source models used a different (through-hole) inverter board. This surface-mount inverter board assembly (5064-0110) is the recommended replacement part for all previous version ac source inverter boards.

Table 5-6. Parts List for FET Board

Reference Desig. Applicability Agilent Part No. Description

ELECTRICAL PARTS C201 All 0160-7505 CAP 7 uf 5% 200V C202,206,220,222 All 0180-4132 CAP 6.8uf 35V C203,218,227 All 0160-4835 CAP 1 uF 10% 50V C204,205,217,221,242,243 All 0160-5098 CAP .22 uF 10% C207.209,215,216 6811A/B,6812A/B,6841A 0140-0204 CAP 47 pF 5% 500V C208.219 6811A/B,6812A/B,6841A 0160-2006 CAP 100 pF 10% C207-209,215,216,219 6813A/B,6842A 0160-2006 CAP 100 pF 10% C210,211,213,214 All 0160-6838 CAP 2200 pf IKV C226,239 All 0160-4791 CAP 10 pF 5% 100V C228 All 0160-4904 CAP 6800 pF 5% C229,235-238,240 All 0160-4832 CAP .01 uF 10% C230 All 0160-4831 CAP 4700 pF 10% C244,245 All 0160-6806 CAP 1 uF 400V D201,203,204,206-210 All 1901-0050 DIO-SWITCHING D202,205 All 1901-1065 DIO-lN4936 PWR D213-217,220-223 All 1901-0050 DIO-SWITCHING D224 All 1901-0731 DIO-lN4004/10GO4 E239 All 5080-2359 CABLE E242 All 5080-2361 CABLE J200 All 1252-0055 CONN-POST-TP HDR L201,204,214,215 All 9170-1454 CORE-SHLD-BEAD L202,203,213,216 6813A/B,6842A 9170-1454 CORE-SHLD-BEAD L206,207,210,211 All 9170-1510 CORE-MAGNETIC L205,208,209,212 6813A/B,6842A 9170-1510 CORE-MAGNETIC Q201,203,222,244 All 5080-2241 FET MATCHED SET Q202,204,211,233 6813A/B,6842A 5080-2241 FET MATCHED SET Q251-254 All 1853-0363 D45H5/H8/X45H281 R201,213,214,216,217 All 0699-3196 RES 150 5% 1OW R202 All 0699-0208 RES 1 5%.25W CF R203 All 0683-8215 RES 820 5%.25W R204 All 0698-0083 RES 1.96K 1% R205,209,229,233 All 0683-2005 20 5% .25W 6174 R206,231 6811A/B,6812A/B,6841A 0683-1515 RES 150 5%.25W R206,231 6813A,6842A 0683-7505 RES 75 5% .25W R207,232 All 0683-0335 RES 3.3 5%.25W R208,230 All 0683-3305 RES 33 5% .25W R210,228 6811A/B,6812A/B,6841A 0683-2015 RES 200 5% .25W R210,228 6813A/B,6842A 0683-1015 RES 100 5% .25W R211,212,226,243 All 0683-1535 RES 15K 5%.25W R220,221,224,225 All 0699-3196 RES 150 5% IOW R222 All 0811-2556 RES 1.25 1% 4W

Replaceable Parts - 5

Table 5-6. FET Board - continued

Reference Desig. Applicability Agilent Part No. Description

R227,248 All 0698-3159 RES 26.IK 1% R237,239,241,242,273-275 All 0757-0437 RES 4.75K 1% R238,240 All 0757-0280 RES IK 1%.125W R244 All 0757-0417 RES 562 1% .125W R245,255 All 0683-1015 RES 100 5%.25W R246 All 0683-1555 RES 1.5M 5%.25W R247 6811A/B,6812A/B,6841A 0698-3450 RES 42.2K 1% R247 6813A/B,6842A 0757-0460 RES 61.9K 1% R249 All 0698-3518 RES 7.32K 1% R250 6811A/B,6812A/B,6841A 0698-3499 RES 40.2K 1% R250 6813A/B,6842A 0757-0458 RES 51.1K 1% R251 All 0757-0288 RES 9.09K 1% R252 All 0698-3225 RES 1.43K 1% R253 6811A/B,6812A/B,6841A 0698-3136 RES 17.8K 1% R253 6813A/B,6842A 0757-0446 RES 15K 1% R254 All 0698-3279 RES 4.99K 1% R256 6811A/B,6812A,6841A 0698-3439 RES 178 1%.125W R256 6813A/B,6842A 0698-3432 RES 26.1 1%.125W R257 All 0757-0316 RES 42.2 1% R258 All 0683-1035 RES 10K 5%.25W R260,261,263-265,267 All 0683-8205 RES 82 5%.25W R262,266 All 0683-1215 RES 120 5%.25W R268 All 0698-3572 RES 60.4K 1% R269 All 0698-4121 RES ll.3K 1% R270 All 0757-0424 RES 1.lK 1% R271 All 0757-0200 RES 5.62K 1% R272 All 0757-0442 RES 10K 1%.125W R285 All 8159-0005 RES-ZERO OHMS R299 All 0698-3646 RES 12K 5% 2W MO RV200 All 0837-0442 VARISTOR T202 All 9100-4350 XFMR-CURRENT T204 All 06624-80091 XFMR-PULSE TB201 All 2110-0726 FUSE CLIPS U201,202 All 1820-8433 IC-PWM IR2110 U203 All 1826-1343 IC-REG TL431CP U204 All 1826-0138 IC-COM LM339N VR201 All 1902-1377 DIO-ZNR 6.19 V W200 All 8150-4697 WIRE 14 WH/GY

Table 5-7. Parts List for DC RAIL Board

Reference Desig. Applicability Agilent Part No. Description

ELECTRICAL PARTS C400-405 All 0160-7640 C-F 330pF 1600V C409,411,413,419,454,475 All 0180-4129 CAP 1uf 35V C416 All 0160-4834 CAP .047UF 10% C417 All 0180-3458 CAP 4700UF 50V C418 All 0180-4405 CAP 470 uf 50V C425, 427-429, 433-442, 449, 453, 465-468

All 0160-5422 CAP .047 UF 20%

5 - Replaceable Parts

Table 5-7. DC RAIL Board - continued

Reference Desig. Applicability Agilent Part No. Description

ELECTRICAL PARTS C426,444,473 All 0180-4136 CAP 10uf 20V C432 All 0150-0050 CAP 1000PF +80 C447,451,495,498 All 0160-5098 CAP .22UF 10% C448 All 0160-4799 CAP 2.2PF C452 All 0160-4808 CAP 470PF 100V C455 All 0160-4831 CAP 4700PF 10% C456 All 0160-4823 CAP 820PF 5% C459 All 0160-4810 CAP 330PF 5% C462,464 All 0160-4797 CAP 3.3PF C463 All 0160-4807 CAP 33PF 5% 100V C476,480 All 0160-4795 CAP 4.7PF C477,478 All 0160-4787 C-F 22PF 5% 100V C481,485 All 0160-4904 CAP 6800PF 5% C482,483,492 All 0160-4835 CAP .1UF 10% 50V C484,489 All 0160-4791 CAP 10PF 5% 100V C491 All 0180-4131 CAP 4.7uf 35 V C493 All 0160-4805 CAP 47PF 5% 100V C494 All 0160-4822 CAP 1000PF 5% C496,497 All 0160-4824 CAP 680pf 100v D400-407 All 1901-1543 DIODE D416-419 All 1901-0731 DIODE-1N4004/10G04 D420,475 All 1901-1098 DIODE-IN4150 D423 All 1902-0951 DIODE-ZENER DS400 All 1990-0517 LED-VISIBLE E430-1,2,3,4 All 1251-5613 CONN-SGL CONN E432 All 5080-2354 CABLE E454 All 1251-0600 CONTACT-CONN M HS400, 402-404, 406, 407 All 1205-0298 HEAT SINK J400 All 1252-2503 CONN-POST-TP-HDR J436 All 1251-8606 CONN-POST-TP-HDR J444 All 1251-5980 CONN-UTIL J445 All 1252-1707 CONN-POST-TP-PST Q450,491 All 1855-0727 MOSFET 2N7000 Q475,476 All 1854-0477 XSTR NPN 2N2222A R1408 All 0698-3499 RES 40.2K 1% R1409 All 0757-0465 RES 100K 1% R400,401,406,407 All 0699-3196 RES 150 5% 10W R403,404 All 0811-1914 RES 5K 5% 10W PW R408,410 All 0811-1708 RES 7K 5%5W 5PWI R412 All 0811-1826 RES .05 10% 3W R413 All 0812-0050 RES 3K 5% 5W PW R414,425,449 All 0698-3279 RES 4.99K 1% R415,420 All 0698-8672 RES 243.4 .1% R416,419,422 All 0757-0281 RES 2.74K 1%

R417, 418, 421, 469, 407,

1417, 1418

R423 All 0698-3637 RES 820 5% 2W MO R424,432,493 All 0757-0199 RES 21.5K 1%

R426, 427, 429, 451, 459, 471,

1401-1405

R428,463 All 0757-0446 RES 15K 1% .125W R430 All 0698-8827 RES 1M 1% .125W

All 8159-0005 RES-ZERO OHMS

All 0698-3155 RES 4.64K 1%

Replaceable Parts - 5

Table 5-7. DC RAIL Board - continued

Reference Desig. Applicability Agilent Part No. Description

ELECTRICAL PARTS R431 All 0698-3159 RES 26.1K 1% R433 All 0698-8807 RES 39K .1% R434,435 All 0698-6369 RES 1M .1% .25W R436 All 0698-6614 RES 7.5K .1% R437 All 0699-0721 RES 33K .1% R439 All 0698-6977 RES 30K .1% .125 R440, 444, 450, 458, 1415 All 0757-0419 RES 681 1% .125W R441 All 0757-0420 RES 750 1% .125W R445 All 0698-6376 RES 200K .1% R446 All 0698-0085 RES 2.61K 1% R447 All 0698-6392 RES 22K .1%.125W R448 All 0698-3700 RES 715 1% .125W R452 All 0683-2255 RES 2.2M 5% .25W R453 All 0698-0083 RES 1.96K 1% R454 All 0699-0486 RES 2K .1% .1W F R456, 468, 470, 499, 1411 All 0698-3430 RES 21.5 1% R457 All 0698-3486 RES 232 1% .125W R460 All 0698-8816 RES 2.15 1% R462 All 0757-0462 RES 75K 1% .125W R464 All 0757-0274 RES 1.21K 1% R465 All 0757-0467 RES 121K 1% R467 All 0698-4479 RES 14K 1% .125W R475,476 All 0699-0070 RES 3.16M 1% R477 All 0757-0280 RES 1K 1% .125W R478, 482, 484, 485 All 0757-0472 RES 200K 1% R479, 481, 491 All 0757-0442 RES 10K 1% .125W R480, 487, 1410 All 0757-0407 RES 200 1% .125W R483,489 All 0757-0434 RES 3.65K 1% R486,488 All 0698-4486 RES 24.9K 1% R490 All 0698-4446 RES 267 1% .125W R492 All 0757-0273 RES 3.01K 1% R494,496 All 0757-0427 RES 1.5K 1% R495,497 All 0757-0401 RES 100 1% .125W REF U463 All 1200-0639 SKT-IC 20-CONT T491 All 06624-80091 XFMR-PULSE TP401-404 All 1251-5380 POST-TP-HDR 6603 U416 All 5060-3212 ASSY-HS 317T U417 All 1826-0122 IC 7805/340T-5 U418 All 1826-0527 IC LM337T U423 All 1826-2341 IC-REG TL7702BCP U424 All 1826-0138 IC-COM LM339N U433,434 All 1990-0732 OPTO-ISOLATOR U435 All 1990-1502 OPTO-ISOLATOR U436 All 1990-0429 OPTO-ISOLATOR U447,475 All 1826-1533 IC 34072 U449 All 1826-1437 IC U462 All 1826-0065 IC LM311 U463 All 5080-2405 PRGMD GAL, DIR U464 All 1820-3673 IC MM74HC123N U491 All 1826-2343 IC-REG TL598CN W400 All 7175-0057 WIRE 22

5 - Replaceable Parts

Table 5-8. Parts List for Output Board

Reference Desig. Applicability Agilent Part No. Description

ELECTRICAL PARTS C500-503 All 0180-4649 CAP 2500 uf 300V C506 All 0160-7197 CAP 0.33 uF 630 V C508-516 All 0160-7640 C-F 330 pF 1600V C533,534,541,544, All 0160-5422 CAP .047 uF 20% C540,543 All 0160-4803 CAP 68 pF 5% IOOV C542,554 All 0160-4795 CAP 4.7 pF C545,547 All 0160-4814 CAP 150 pF 5% C546 All 0160-4825 CAP 560 uf 100V C548,549,575,576 All 0160-5422 CAP .047 uF 20% C550 6811A/B 0160-4824 CAP 680 pF C550 6812A/B,6813A/B,

6841A, 6842A C553,555 All 0160-4789 CAP 15 pF 5% 100V C556,557 All 0160-4819 CAP 2200 pF 5% C564,565 All 0180-4136 CAP l0uf 20V C568,569 All 0160-7934 2 uF 300 vac 2% C570 All 0160-4918 CAP .022 uf 10% C571 All 0160-4835 CAP 1 uF 10% 50V C578,579,580 All 0160-5422 CAP 0.047 uF 20% D501,502 All 1901-1098 DIO-IN4150 E525 All 0813-80005 CABLE J524 All 1252-1052 DIN-CONN-MALE J526,527 All 1251-7616 CONN-UTIL MT-LK K500 See Rev C assembly

replacement parts at

end of table. K501 All 0490-1405 RELAY 2C 12 VDC K502,503 All 0490-1961 RELAY 1C 12VDC L500,501 6811A/B 06811-80004 CHOKE L500,503 6812A/B,6813A/B,

6841A,6842A L504 6811A/B 06811-80005 CHOKE L504,505 6812A/B,6813A/B,

6841A,6842A L507,508 All 5080-2330 INDUCTOR L509 All 5080-2368 INDUCTOR-RESON L512,513 All 9135-0481 INDUCTOR-CM L514 All 5080-2461 INDUCTOR P527 All 5080-2351 CABLE P537 All 5080-2346 CABLE P544 All 5080-2363 CABLE P545 All 5080-2350 CABLE Q501,502 All 1855-0665 MOSFET RFP 2Nl2L R502 All 0698-3547 RES 1 5%.5W CC R503,565,576,577 All 0811-1832 RES 5 1% 3W PW R506,507,512-515 All 0683-1065 RES IOM 5%.25W R508,509,566,567 All 0699-1060 RES .05 1% 3W

0160-4809 CAP 390 pF 100V

5080-2331 CHOKE

5080-2332 CHOKE

Replaceable Parts - 5

Table 5-8. Output Board - continued

Reference Desig. Applicability Agilent Part No. Description

R510 6811A/B 06811-80006 RES SHUNT W/PIN R510 6812A/B,6813A/B,

6841A,6842A R511,543,549 All 0699-0222 RES 10.5K .1% R520,R523 All 0698-3152 RES 3.48K 1% R521,522 All 0757-0414 RES 432 1% .125W R529,R530 All 0698-6414 RES IK.1%.lW F R531,536,539-542 All 0699-1743 RES 345K .1% R532,533 All 0699-1741 RES 5.657K.1% R535 All 0699-4307 RESISTOR-FIXED R537,544-546,595,596 All 0757-0401 RES 100 1%.125W R547 6811A/B 0757-1100 RES 600 1% .125w R547 6812A/B,6813A/B,

6841A,6842A R500,501,592,593 All 0698-3260 RES 464K 1% R550,555,558,559 All 0698-8826 RES 825K 1% R551,554 All 0757-0279 RES 3.16K 1% R552,553 All 0698-3156 RES 14.7K 1% R560 All 0698-OG64 RES 9.31K 1% R568 All 0698-3609 RES 22 5% 2W MO R571,572 All 0699-3420 RES 56K 5% 5W R573,574 All 0698-3279 RES 4.99K 1% .125W R575 All 0698-4446 RES 267 1% .125W R569 All 0757-0407 RES 200 1% .125W R578 All 0698-3430 RES 21.5 1% R579,580 All 0698-8812 RES 1 1%.125W F R581 All 0683-0475 RES 4.7 5% .25W R584-591 All 0811-1810 RES 3.6K 5% 3W R594 All 0683-1015 RES 100 5% .25W RT501 All 0837-0397 THERMISTOR TB552 All 0360-2578 BARRIER BLOCK TP500 All 1250-1918 TEST JACK U500 All 1826-1081 IC LF411A U502,506 All 1826-1135 IC OP-27 U503 All 1826-0412 IC LM393N W501 All 7175-0057 WIRE 2

5080-2383 RES SHUNT W/PIN

0698-4463 RES 845 1%.125W

NOTE: The following parts are used only in Output Filter assemblies Revision C and below.

K500 6812A/B,6813A/B,

6841A,6842A L510,511 6812A/B,6813A/B,

6841A,6842A R500,501 6812A/B,6813A/B,

6841A,6842A R503 6812A/B,6813A/B,

6841A,6842A R584-591 6812A/B,6813A/B,

6841A,6842A

5063-3494 RELAY-ASSEMBLY

9140-1743 CHOKE 82uH MOLDED

0698-3260 RES 464k 1%

0812-0047 RES 5 5% 5W PW

0811-1810 RES 3.6K 5% 3W

5 - Replaceable Parts

Table 5-9. Parts List for Control Board

Reference Desig. Applicability Agilent Part No. Description U985 U988 U991 U1801

All All All All

5080-2410 5080-2408 5080-2409 5080-2407

Table 5-10. Parts List for Front Panel

Reference Desig. Applicability Agilent Part No. Description G1, G2 U004

All All

0960-0912 5080-2384

Table 5-11. Parts List for DSP Board

Reference Desig. Applicability Agilent Part No. Description U714 U715 U716 U734 U734 U735 U735

6841A,6842A 6841A,6842A 6841A,6842A 6811A,6812A,6813A 6811B,6812B,6813B,6841A,6842A 6811A,6812A,6813A 6811B,6812B,6813B,6841A,6842A

5080-2421 5080-2422 5080-2423 5080-2411 5080-2424 5080-2412 5080-2425

Table 5-12. Parts List for Thermistor Board

Reference Desig. Applicability Agilent Part No. Description RT1 3004 All

All

0837-0397 5080-2367

Programmed GAL Freq programmed GAL Status Programmed GAL Protect Programmed GAL PWM/RLY

RPG Programmed ROM front panel

Programmed GAL Programmed GAL Programmed GAL Programmed ROM Programmed ROM Programmed ROM Programmed ROM

Thermistor Cyl. Cable

PC Board (A1)

Keypad (M1)

Front Frame (M2)

Window (M3)

Label ( M4)

Knob (M5)

Nameplate (M6)

Figure 5-1. Front Panel Components (see Table 5-1)

Diagrams

Introduction

This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent Series 6611A/B 6612A/B 6613A/B AC Power Source/Analyzers, and Agilent Series 6841A/6842A/6843A Harmonic Flicker Test Systems. Unless otherwise specified, a drawing or diagram applies to all models of the series (see general schematic note #1). Wiring connections to external equipment are shown in the ac source User’s Guide.

General Schematic Notes

a Not all components or values shown on the schematic apply to all ac source models. The parts lists in Chapter 5 contains information about components that are model-specific.

a All resistors are in ohms 1%, 1/8 W, unless otherwise specified.

a All capacitors are in microfarads unless otherwise specified.

a Signal lines that are terminated by flags continue on other sheets and may go to other

locations on the same sheet. For example: CVPROG (SH.2 8C)on sheet 2 location 8C) the same location All resistors are in ohms 1%, 1/8 W, unless otherwise specified.

a All resistors are in ohms 1%, 1/8 W, unless otherwise specified.

a Unless otherwise noted, bias connections to integrated-circuit packages are as follows:

Common 5 V 14-pin packages pin 7 pin 14 16-pin packages pin 8 pin 16 20-pin packages pin 10 pin 20

6 - Diagrams

List of Figures

Figure 6-1. Interconnect Diagram 65 Figure 6-2. Front Panel Assembly, Component Locations 66 Figure 6-3. Front Panel Assembly, Schematic Diagram (2 sheets) 67 Figure 6-4. GPIB Assembly, Component Locations 69 Figure 6-5. GPIB Assembly, Schematic Diagram 70 Figure 6-6. FET Assembly, Component Locations 71 Figure 6-7. FET Assembly, Schematic Diagram 72 Figure 6-8. AC Input Assembly, Component Locations 73 Figure 6-9. AC Input Assembly, Schematic Diagram 74 Figure 6-10. DC Rail/Diode Assembly, Component Locations (2 sheets) 75 Figure 6-11. DC Rail/Diode Assembly, Schematic Diagram (3 sheets) 77 Figure 6-12. Bias Assembly, Component Locations 80 Figure 6-13. Bias Assembly, Schematic Diagram (2 sheets) 81 Figure 6-14. Inverter Assembly, Component Locations 83 Figure 6-15. Inverter Assembly, Schematic Diagram (2 sheets) 84 Figure 6-16. DSP Assembly, Component Locations (2 sheets) 86 Figure 6-17. DSP Assembly, Schematic Diagram (10 sheets) 88 Figure 6-18. Control Board, Component Locations (2 sheets) 98 Figure 6-19. Control Assembly, Schematic Diagram (7 sheets) 100 Figure 6-20. Output Board, Component Locations 107 Figure 6-21. Output Assembly, Schematic Diagram (4 sheets) 108 Figure 6-22. Trigger Board, Component Locations 112 Figure 6-23. Trigger Assembly, Schematic Diagram 113 Figure 6-24. Thermistor Assembly, Component Locations 114 Figure 6-25. Thermistor Assembly, Schematic Diagram 114 Figure 6-26. Transformer Assembly, Component Locations 114 Figure 6-27. Thermistor Assembly, Schematic Diagram 114

Figure 6-1. Interconnect Diagram

+36V

+5V

Figure 6-2. Front Panel Assembly, Component Locations

Figure 6-3. Intelligent Front Panel Assembly, Schematic Diagram (sheet 1 of 2)

Figure 6-3. Intelligent Front Panel Assembly, Schematic Diagram (sheet 2 of 2)

Figure 6-4. GPIB Assembly, Component Locations

Figure 6-5. GPIB Assembly, Schematic Diagram

Figure 6-6. FET Assembly, Component Locations

Figure 6-7. FET Assembly, Schematic Diagram

0 V

150

300 Vdc

Vdc

Figure 6-8. AC Input Assembly, Component Locations

Figure 6-9. AC Input Assembly, Schematic Diagram

RAIL_LO_FAULT (LO)

RAIL_LO_WARN (LO)

RAIL_PCLR_ISO (5V)

RAIL_HI_FAULT (LO)

RAIL_INH (LO)

Figure 6-10. DC Rail/Diode Assembly, Component Locations (sheet 1 of 2)

RAMP (fig 403)

RAMP (fig 404)

RAMP PULSE (fig 402)

PWM_EN (5V) +10V RAIL_REF

1/2 EXT_CLK_ISO

EXT_CLK_ISO

RAIL_PCLR_ISO (5V)

RAIL_LO_FAULT (LO)

TP1

RAIL_INH (LO)

RAIL_HI_FAULT (LO)

RAIL_LO_WARN (LO)

RAIL_VMON (10V)

Figure 6-10. DC Rail/Diode Assembly, Component Locations (sheet 2 of 2)

Figure 6-11. DC Rail/Diode Assembly, Schematic Diagram (sheet 1 of 3)

Figure 6-11. DC Rail/Diode Assembly, Schematic Diagram (sheet 2 of 3)

Figure 6-11. DC Rail/Diode Assembly, Schematic Diagram (sheet 3 of 3)

12 Vdc /

15 Vdc / 12-15 Vdc /

+15 Vdc /

25-30 Vdc

5 Vdc

-15 Vdc /

5 Vdc /

Figure 6-12. Bias Assembly, Component Locations

Figure 6-13. Bias Assembly, Schematic Diagram (sheet 1 of 2)

Figure 6-13. Bias Assembly, Schematic Diagram (sheet 2 of 2)

Figure 6-14. Inverter Assembly, Component Locations

+RAIL

GATE_1A

SOURCE_1A

1855-0801 MTD2955V

A19.6

R619

Q626

68PF A 0160-7868

1855-0843

MTD3055V

0699-3908

R620R661

C608C601

12MC601

149270

250V PMET

149270

250V PMET

9170-1476

Q602

149256

APT6025BVR

L621

D604

149259

D605

149259

600V

149257

C682

Not LoadedNot Loaded

C681

680PF 5%

149256

APT6025BVR

R680R681R682

200

149263

1.6 5%

D601

200

149263

1.6 5%

C602

1.6 5%

680PF 5%

200

149263

149261

1000V

9170-1476

D603

149258

-RAIL -RAIL

+RAIL

149261

1000V

149261

1000V

C1M

R601

C1M

R602

C1M

R603

C1M

R604

10%

C613

3.3

0699-1327

NOTE: This screw mounts to the heat sink

MP23

SCREW_M3_P

0699-1327

149276

600V PMET

BLK

E626-2

BLK

E627-2

C614

1252-1346

10%

3.3

600V PMET

REDRED

E626-1

E627-1

149276

1252-1346

C615

10%

3.3

149276

600V PMET

R693R694R695R697

R696 R692

5%13K

200

5%13K

200

0699-3409

200

0699-3409

D602

600V

149257

R686R687R688

C607

1.6 5%

680PF 5%

200

149263

200

149263

200

149263

149261

1000V

100PF 1000V

R612

1/2W

200

0699-3538

NOT LOADED

Q627

C666 C674

68PF A

A19.6

0160-7868

R613

1/2W

0699-3538

R614

1/2W

0699-3538

200

5% 200

D631

R615

1/2W

0699-3538

1906-0358

200

1906-0358

D632

0699-3908

L602

9170-1476

L601

9170-1476

0699-3970

10K A

149262

Q601

L620

0.022 10%

C604 C603

0.022 10%

APT6025BVR

149256

+RAIL

L624

D612

Q605

9170-1476

149258

D610

D611

APT6025BVR

149256

149259

L625

Q606

9170-1476

12MC606

100PF 1000V

149262

C609

C610

9170-1476

250VPMET

0.02210% 149270

250VPMET

0.02210% 149270

L605

L606

R672

1906-0358

D636

0699-3970

10K A

R656

1/2W

0699-3538

1906-0358

D635

R659

1/2W

0699-3538

5% 200

200

R657

1/2W

0699-3538

R658

1/2W

0699-3538

1855-0801 MTD2955V

Q632

NOT

5% 200

LOADED

Q633

68PF A

0160-7868

1855-0843 MTD3055V

C676C668

68PF A

0160-7868

A19.6

R654

R653

0699-3908

A19.6

0699-3908

GATE_3A

SOURCE_3A

GATE_4A

SOURCE_4A

E601

1250-1918

Not Loaded

1855-0801 MTD2955V

A19.6

R660

Q634

C677

68PF A 0160-7868

1855-0843

MTD3055V

0699-3908

NOT LOADED

A19.6

0699-3908

Q635

C675

68PF A 0160-7868

R667

1/2W

0699-3538

R668

1/2W

0699-3538

5% 200

R666

1/2W

0699-3538

D637

R669

1/2W

0699-3538

200

1906-0358

200

1906-0358

D638

R679 R655

100PF 1000V

L604

9170-1476

L603

9170-1476

0699-3970

10K A

C605

149262

E603

D606

149258

1250-1918

Not Loaded

Q603

L622

Q604

149256

APT6025BVR

9170-1476

12MC603 12MC608

L623

APT6025BVR

9170-1476

149256

C606R683R685

R684

149261

680PF 5%

1000V

200

149263

1.6 5%

600V

D607

200

1.6 5%

149257

149263

D608

600V

149257

200

149263

1.6 5%

F600

10A

2110-0624

J625

2 PIN

F601

6.3A

149272

1 2

Not Loaded

-RAIL

+RAIL

L651

1.8UH

149285

UTILITY

1251-7616

R689 C611R691

R690

149261

Not Loaded

680PF 5%

1000V

200

149263

1.6 5%

200

149263

1.6 5%

200

149263

1.6 5%

APT6025BVR

149256

L626

D609

Q607

149258

149256

9170-1476

APT6025BVR

Q608

L627

9170-1476

100PF 1000V

149262

C612

L607

9170-1476

L608

9170-1476

1250-1918

Not Loaded

E608

R662

1906-0358

D634

0699-3970

10K A

R649

1/2W

0699-3538

1906-0358

D633

R652

1/2W

0699-3538

200

1/2W

0699-3538

1/2W

0699-3538

200

R650

R651

1855-0801 MTD2955V

Q628

NOT

Q629

LOADED

1855-0843 MTD3055V

5% 200

C665

68PF A

0160-7868

C667

68PF A

0160-7868

A19.6

R617

R621

0699-3908

A19.6

0699-3908

E609

1250-1918

Not Loaded

GATE_2A

SOURCE_2A

Figure 6-15. Inverter Assembly, Schematic Diagram (sheet 1 of 2)

To Bias Board

To DSP Board

To Control Board

Bias Test

U620

MC78M05CDT

I O

1826-1734

COMM

0180-4577

11 10

C642

C641

11 10

C652

C653

1820-5656

CLR B

C100PF

0160-7733

CLR

C100PF

0160-7733

CLR B

0160-7835

100PF A

CLR

0160-7835

100PF A

Not Loaded

C692

+5V

VCC

U605

R/CXTCXT

GND

+5V

VCC

U605

1820-5656

R/CXTCXT

GND

+5V

VCC

U610

1820-5656

R/CXTCXT

GND

+5V

VCC

U610

1820-5656

R/CXTCXT

GND

R627

0_OHM

0699-2643

R633

0_OHM

0699-2643

1020%

TA 10V

0180-4577

Break before make circuit 2

C643

0.047 D

0160-5944

R635

0699-4417

Break before make circuit 1

R636

1514

0699-4417

C651

0.047 D 0160-5944

R641

10K A 0699-3970

R642

1514

10K A 0699-3970

+5V_DSP

+5V

TDLY_2

+5V

B3.65K

TDLY_1

+5V

B3.65K

Turn-off Pulse Width 1

+5V

Turn-on Pulse Width 1

TON_01

+5V

TOFFM_2

TONR_2

TONM_2

C647C648

PWMIN PCLR TON_02 TON_01 TDLY_2 TDLY_1 OPTO TOFF_2 TOFF_1

3 2 1

100PF A

11 10

100PF A

+5V

VCC

U606

1820-5656

CLR B A

GND

0160-7835

+5V

VCC

U606

1820-5656

CLR B A

GND

0160-7835

1 2 3 4 5 6 7 8 9

R/CXTCXT

+5V

VCC

U608

GAL16V8 I0/CLK I1 I2 I3 I4 I5 I6 I7 I8 OE/I9

1820-8602

GND

C645

0.047 D

0160-5944

4 1514

12 76

I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 I/O0

R639

10K A 0699-3970

R640

10K A 0699-3970

19 18 17 16 15 14 13 12

TOFF_2

TON_02

+5V

TOFFM_2 TOFFM_1 TONM_2 TONM_1 TONR_2 TONR_1 TONG_2 TONG_1

Turn-off Pulse Width 2

Turn-on Pulse Width 2

R605

511 B

0699-3032

0.047D

C649

C644

0160-5944

2220%

C688

TA 20V

0180-4116

TOFF_2

TOFF_1

TONG_2

TONG_1

B1500PF

0160-7712

+12V

R609R608

+12V

R607

R606

C646

0.047 D 0160-5944

2 6 7

0699-3982

31.6K A

0699-3978

21.5K A

0699-3982

31.6K A

0699-3978

21.5K A

2 6 7

+12V

14 11

VIN

U607

149277

SHTDN IBOAOB

GND

L A B

16 9

Not Loaded

Turn-on Drive Enable

Low=Disabled

+12V

14 11

VIN

U609

149277

SHTDN

IBOAOB

GND

L A B

16 9

Turn-off Drive

Turn-on Drive

R625

0_OHM

0699-2643

R643

0699-3830

26.1 B

Not Loaded

R637

26.1 B 0699-3830

R638

26.1 B 0699-3830

Not Loaded

R644

26.1 B 0699-3830

R699

R698

100

200

100

Q625

On FET

200

0699-3407

Q631

On FET

R646

0699-3407

R663

100

200

Q624

100

0699-3407

Off FET

1855-0843

MTD3055V

200

Q630

0699-3407

Off FET

1855-0843

MTD3055V

+12V

1855-0843

MTD3055V

R647C661

C683

5%6.8

20% 47

5001/8W

0699-2064

TA 20V

0180-4535

C663

B1500PF

0160-7712

+12V

1855-0843

MTD3055V

R664C670

C679

5%6.8

20% 47

5001/8W

0699-2064

TA 20V

0180-4535

C680

B1500PF

0160-7712

10%1UF

X7R16V

0160-7736

R648C664

0160-7736

R665C673

T601

2 9 6

5080-2371

5%6.8

5001/8W

B1500PF

0160-7712

T602

2 9 6

5080-2371

5%6.8

5001/8W

0699-2064

B1500PF

0160-7712

4 7 5

0699-2064

4 7 5

GATE_1A

SOURCE_1A

GATE_2A

SOURCE_2A

GATE_3A

SOURCE_3A

GATE_4A

SOURCE_4A

R628

0_OHM

+5V_DSP

J638

4 PIN

POST

1251-3305

1 2 3 4

Not Loaded

C684

2220%

TA 20V

0180-4116

Unreg. 25-30 Vdc

C687

20% 100

Unreg. Common

AL 50V

0180-3334

WHT OR BLK BLK

U619

SWSHDN

MIC4576

149260

1 4

VIN FB

GND

MC610

D650

L650

330UH

9140-2261

1901-1366

C690

20% 47

TA 20V

0180-4535

R631

R632

B14.7K

0699-3067

0699-3952

1.62K A

C691

B560PF

0160-7865

2110-0944

F602

1.5A

VR601

0699-2643

R630

24 1W 0699-3760

15V_5%

5% 200

1902-1643

+12V

1 2

1020%

C693

TA 10V

B36.5K

R610

U602

HCPL-0631

U602

149271

HCPL-0631

149271

+5V

0699-3713

+5V

C637

0.047 D

0160-5944

+5V

R622

+5V

R623

511 B

0699-3032

0699-3953

1.78K A

OPTO

D640

1906-0358

Not Loaded

R624

Q619

0699-3962

4.22K A

1854-1037

MMBT3904

Positive edge trigger

Negative edge trigger

J646

4 PIN

POST

1251-3305

J628

4 PIN

POST

1251-3305

J600

1251-4670

HEADER

2 3 4

1 2 3 4

1 2 3

+5V_DSP

Unreg_DSP No Connect

+5V_DSP Comm

PWM+ CONTROL_5 INV_OFF

Spare

+5V

+12V

WHT OR N/C BLK

WHT BLK OR RED

A3.83K

R626

0699-3961

+12V

R629

7.5K A

0699-3967

TOFFM_1

PCLR

TONR_1

TONM_1

+12V

R671

R670

0.1%

15K

0.1%4.64K

0699-2836

1/8W 25

0699-2967

1/8W 25

C694

A270PF

0160-7511

+12V

+12V and +5V Undervoltage Detect

+5V

R677

464K A

2220%

TA 20V

R676

1K A

0699-3947

0180-4116

0699-4009

R673R674

0699-2721

1/8W 25

3.16K 0.1%

Q644

1853-0525

MMBT2907

C689

0.047 D

0160-5944

0.1%4.64K

1/8W 25

0699-2967

C686

2 4 3

R678

VCC

U621

1826-2801

SEN1

IOUT I DOUT SEN2

REM

VEE

10 A

0699-3901

C685

0.047 D

0160-5944

6 8 5

R675

464K A

0699-4009

Figure 6-15. Inverter Assembly, Schematic Diagram (sheet 2 of 2)

Figure 6-16. DSP Assembly, Component Locations (sheet 1 of 2)

Figure 6-16. DSP Assembly, Component Locations (sheet 2 of 2)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 1 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 2 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 3 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 4 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 5 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 6 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 7 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 8 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 9 of 10)

Figure 6-17. DSP Assembly, Schematic Diagram (sheet 10 of 10)

Figure 6-18. Control Board, Component Locations (sheet 1 of 2)

U801-23

U801-25

Figure 6-18. Control Board, Component Locations (sheet 2 of 2)

Figure 6-19. Control Assembly, Schematic Diagram (sheet 1 of 7)

Agilent 6811B Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty Information

Safety Summary

Notice

Printing History

Table of Contents

Introduction

Organization

Safety Considerations

Related Documents

Revisions

Instrument Identification

Manual Revisions

Firmware Revisions

Electrostatic Discharge

Performance Tests

Introduction

Test Equipment Required

Current Monitoring Resistor

Constant Voltage Tests

Procedures

Principles of Operation

Introduction

General Description

A1 Front Panel Assembly

A2 GPIB / RS-232 Interface Assembly

A3 FET Assembly

A4 AC Input Assembly

A5 DC Rail Assembly

A6 Bias Assembly

A7 Inverter Assembly

A8 Digital Signal Processing (DSP) Assembly

A9 Output / Filter Assembly

A10 Control Assembly

A11 Trigger ( BNC ) Assembly

Troubleshooting

Introduction

Test Equipment Required

Troubleshooting Hints

Power-on Self-test Failures

Run-Time Errors

Overall Troubleshooting Flowchart

A1 Front Panel Assembly Troubleshooting

A2 GPIB/RS-232 Board Troubleshooting

A3 FET Board Troubleshooting

A5 DC Rail Assembly Troubleshooting

A6 Bias Assembly Troubleshooting

A7 Inverter Assembly Troubleshooting

Slow-Start Procedure

A8 DSP and A10 Control Assembly Troubleshooting

A9 Output/Filter/Relay Assembly Troubleshooting

A11 Trigger/BNC Board Troubleshooting

Initialization

ROM Upgrade

Identifying the Firmware

Upgrade Procedure

Post-Repair Calibration

Inhibit Calibration Switch

Disassembly Procedures

List of Required Tools

Top Cover ( outer cover ) Removal

Inner Top Cover Removal

A1 Front Frame / Panel Assembly Removal and Replacement

A2 GPIB / RS 232 Board Removal and Replacement

A3 AC FET Assembly Removal and Replacement

A4 AC Input Board Removal and Replacement

A5 DC Rail Board Removal and Replacement

A6 Bias Board Removal and Replacement

A7 Inverter Assembly Removal and Replacement

A8 DSP Board and A10 Control Board Removal and Replacement

A11 Trigger ( BNC ) Board Removal and Replacement

A9 Output Board Removal and Replacement

Replaceable Parts List

Introduction

Reading the Tables

How to Order Parts

Diagrams