Agilent Technologies 6633B, 66332A, 6632B User Manual

Download

Service Manual

Agilent Model 66332A

Dynamic Measurement DC Source

and Agilent Model 6632B, 6633B, 6634B

System DC Power Supply

For instruments with Serial Numbers:

Agilent 66332A: US37470791 and up Agilent 6632B: US37471966 and up Agilent 6633B: US37470746 and up Agilent 6634B: US37470655 and up

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

Agilent Part No. 5962-8119 Printed in U.S.A. Microfiche No 6962-8120 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

The following general safety precautions must be observed during all phases of operation of this instrument. Failure to compl with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use o requirements.

WARNING

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. 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.

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"

GROUND THE INSTRUMENT.

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). 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.

FUSES

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.

the instrument. Agilent Technologies assumes no liability for the customer's failure to comply with these

KEEP AWAY FROM LIVE CIRCUITS.

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before touching components.

DO NOT SERVICE OR ADJUST ALONE.

Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present. 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.

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.

Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to an Agilent Technologies Sales and Service Office for service and repair to ensure that safety features are maintained.

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, 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.

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

Direct current

Alternating current

Both direct and alternating current

Three-phase alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

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

Terminal for Neutral conductor on permanently installed equipment

Terminal for Line conductor on permanently installed equipment

On (supply)

Off (supply)

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.

In position of a bi-stable push control

Out position of a bi-stable push control

Caution, risk of electric shock

Caution, hot surface

Caution (refer to accompanying documents)

Notice

The information contained in this document is subject to change without notice. Agilent Technologies makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability, and fitness for a particular purpose.

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, Inc.

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual containing minor corrections and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition incorporates all new or corrected material since the previous printing date.

Changes to the manual occurring between revisions are covered by change sheets shipped with the manual. In some cases, the manual change applies only to specific instruments. Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments.

Edition 1...............................................................June, 1997

Edition 2...............................................................September, 2000

Instrument Identification

The power supply is identified by a unique serial number such as US36310101. The items in this serial number are explained as follows:

US36310101

The first two letters indicate the country of manufacture. US = United States.

The next four digits are the year and week of manufacture or last significant design change. Add 1960 to the first two digits to determine the year. For example, 36=1996. The third and fourth digits specify the week of the year (31 = the thirty-first week).

The last four digits (0101) are a unique number assigned to each unit.

Warranty Information 2 Safety Summary 3 Notice 4 Printing History 5 Instrument Identification 5 Table of Contents 6

INTRODUCTION 9

Organization 9 Safety Considerations 9 Related Documents 9 Revisions 10

Manual Revisions 10 Firmware Revisions 10

Electrostatic Discharge 10

VERIFICATION AND PERFORMANCE TESTS 11

Introduction 11 Test Equipment Required 11 Measurement Techniques 12

Setup for Most Tests 12 Electronic Load 13 Current-Monitoring Resistor 13

Operation Verification Tests 13 Performance Tests 13

Programming 13

Constant Voltage (CV) Tests 14

CV Setup 14 Voltage Programming and Readback Accuracy 14 CV Load Effect 14 CV Source Effect 15 CV Noise (PARD) 15 Transient Recovery Time 16

Constant Current (CC) Tests 16

CC Setup 16 Current Programming and Readback Accuracy 16 Current Sink (CC-) Operation 17 CC Load and Line Regulation 17 CC Load Effect 18 CC Source Effect 18 CC Noise (PARD) 19

Performance Test Equipment Form 19 Performance Test Record Form 20

TROUBLESHOOTING 23

Introduction 23 Test Equipment Required 24 Overall Troubleshooting 24

Flow Charts 24

Specific Troubleshooting Procedures 34

Power-on Self-test Failures 37 CV/CC Status Annunciators Troubleshooting 38 Bias and Reference Supplies 38 J307 Voltage Measurements 39 Manual Fan Speed Control 40 Disabling Protection Features 40

Post-repair Calibration 41

Inhibit Calibration Switch 41 Calibration Password 41

Initialization 42 ROM Upgrade 42

Identifying the Firmware 42 Upgrade Procedure 42

Disassembly Procedures 43

List of Required Tools 43 Cover, Removal and Replacement 44 A2 Interface Board, Removal and Replacement 44 Front Panel Assembly, Removal and Replacement 44 A3 Front Panel Board, Removal and Replacement 45 A1 Main Control Board 45 T1 Power Transformer, Removal and Replacement 45 Line Voltage Wiring 46

PRINCIPLES OF OPERATION 47

Introduction 47 I/O Interface Signals 47 A3 Front Panel Circuits 48 A2 Interface Circuits 48

Primary Interface 48 Secondary Interface 48

A1 Main Board Circuits 50

Power Circuits 50 Control Circuits 52

REPLACEABLE PARTS LIST 55

Introduction 55

DIAGRAMS 71

Introduction 71

General Schematic Notes 71 Backdating 71

INDEX 81

Introduction

Organization

This manual contains information for troubleshooting and repairing to the component level the Agilent Model 66332A Dynamic Measurement DC Source and the Agilent Model 6632B, 6633B, 6634B System DC Power Supplies. Hereafter all models will be referred to as the dc power supply.

This manual is organized as follows:

Chapter 1

Chapter 2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Organization

Performance tests

Troubleshooting procedures

Principles of operation on a block-diagram level

Replaceable parts

Diagrams

Safety Considerations

WARNING: Hazardous voltages exist within the dc power supply chassis.

This dc power supply; 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 3-wire, ground receptacle. Refer to the "Safety Summary" page at the beginning of this manual for general safety information. Before operation or repair, check the dc power supply and review this manual for safety warnings and instructions. Safety warnings for specific procedures are located at appropriate places in the manual.

Revisions

Manual Revisions

This manual was written for dc power supplies that have the same manufacturing dates (the first four digits) as those listed on the title page and whose unique identification number (the last four digits) are equal to or higher than those listed in the title page.

NOTE: If the first four digits of the serial number of your unit are higher than those shown in 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 dc power supply, those differences are documented in one or more Manual Change sheets included with this manual.

Firmware Revisions

You can obtain the firmware revision number by either reading the integrated circuit label, or query the dc power supply using the GPIB *IDN?' query command (See Chapter 3, ROM Upgrade).

Electrostatic Discharge

CAUTION: The dc power supply 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 dc power supply, 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 dc power supply before removing or installing printed circuit boards.

Verification and Performance Tests

Introduction

This document contains test procedures to verify that the dc power supply is operating normally and is within published specifications. There are three types of tests as follows:

Built-in Self Tests

Operation Verification

Performance Tests

NOTE: The dc power supply must pass the built-in self-tests before calibration or any of the verification

or performance tests can be performed. If the supply fails any of the tests or if abnormal test results are obtained, refer to the troubleshooting procedures in Chapter 3. The troubleshooting procedures will determine if repair and/or calibration is required.

These tests, run automatically when the power supply is turned on, check most of the digital circuits and the programming and readback DACs.

These tests verify that the power supply is probably operating normally but do not check all of the specified operating parameters.

These tests check that the supply meets all of the operating specifications as listed in the Operating Manual.

Test Equipment Required

Table 2-1 lists the equipment required to perform the verification and performance tests. 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 supply.

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

Type Specifications Recommended Model

Current Monitor Resistor

DC Power Supply 5 V, 10 A Agilent 6642A, 6653A

Digital Voltmeter Resolution: 10 nV @ 1V

Electronic Load 20 V, 5 A minimum, with transient capability Agilent 6060B or equivalent

GPIB Controller HP Series 300 or other controller with full

15 A (0.1 ohm) 0.04%, for power supplies up to 15 A output

Readout: 8 1/2 digits Accuracy: 20 ppm

GPIB capabilities

Guildline 9230/15

Agilent 3458A or equivalent

2 - Verification and Performance Tests

Resistor (substitute for electronic load if load is too noisy for CC PARD test)

1 ohm, 50 W 3 ohm, 100 W (Agilent 66332A/6632B) 24 ohm, 100 W (Agilent 6633B) 99 ohm, 100 W (Agilent 6634B) 1k ohm, 5%, 3W (all models)

Oscilloscope Sensitivity: 1 mV

Ohmite L50J1R0 Ohmite RLS5R0 (adjustable) Ohmite RLS25R (adjustable) Ohmite RLS100 (adjustable) Agilent 0813-0001

Agilent 54504A or equivalent Bandwidth Limit: 20 MHz Probe: 1:1 with RF tip

RMS Voltmeter True RMS

Agilent 3400B or equivalent Bandwidth: 20 MHz Sensitivity: 100 µV

Variable-Voltage Transformer

Adjustable to highest rated input voltage range. Power: 500 VA

Measurement Techniques

Test Setup

Most tests are performed at the rear terminals of the supply as shown in Figure 2-1a. Measure the dc voltage directly at the +S and -S terminals.

+ 240 VDC MAX TO

+--S

+ 240 VDC MAX TO

+--S

DVM, Scope, or

RMS voltmeter

(for CV tests)

DVM or

RMS voltmeter

(for CC tests)

Current

monitor

Electronic

Load

(see note)

Note: Use dc supply with same polarity

connections for - CC tests.

Replace load with appropriate

resistor for CC noise test.

Figure 2-1. Test Setup

Ammeter

Load

resistor

1 k

+ 240 VDC MAX TO

+--S

Ammeter

External

DC supply

Load

resistor

1 k

Verification and Performance Tests - 2

Electronic Load

Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable resistor is used, switches should be used to either; connect, disconnect, or short the load resistor. For most tests, an electronic load can be used. The electronic load is considerably easier to use than load resistors, but it may not be fast enough to test transient recovery time and may be too noisy for the noise (PARD) tests.

Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures. Also, if computer controlled test setups are used, the relatively slow (compared to computers and system voltmeters) settling times and slew rates of the power supply may have to be taken into account. "Wait" statements can be used in the test program if the test system is faster than the supply.

Current-Monitoring Resistor

To eliminate output-current measurement error caused by voltage drops in the leads and connections, connect the current monitoring resistor between the -OUT and the load as a four-terminal device. Connect the current-monitoring leads inside the load-lead connections directly at the monitoring points on the resistor element.

Operation Verification Tests

To assure that the supply is operating properly, without testing all specified parameters, perform the following test procedures:

a. Perform the turn-on and checkout procedures given in the Operating Manual.

b. Perform the Voltage Programming and Readback Accuracy test, and the Current Programming and Readback

Accuracy tests from this procedure.

Performance Tests

NOTE: A full Performance Test consists of only those items listed as “Specifications” in Table A-1 of the

Operating Manual, and that have a procedure in this document.

The following paragraphs provide test procedures for verifying the supply's compliance with the specifications listed in Table A-1 of the Operating Manual. All of the performance test specifications and calculated measurement uncertainties are entered in the appropriate Performance Test Record Card for your specific model. You can record the actual measured values in the column provided in this card.

If you use equipment other than that recommended in Table 2-1, you must recalculate the measurement uncertainties for the actual equipment used.

Programming

You can program the supply from the front panel keyboard or from a GPIB controller when performing the tests. The test procedures are written assuming that you know how to program the supply either; remotely from a GPIB controller or locally using the control keys and indicators on the supply's front panel. Complete instructions on remote and local programming are given in the User’s Guide and in the Programming Guide. Programming ratings are as follows:

2 - Verification and Performance Tests

Table 2-2. Programming Ratings

Model Voltage Rating Full Scale Rating Current Rating Full Scale Rating

Agilent 66332A/6632B

Agilent 6633B

Agilent 6634B

20 V

50 V

100 V

20.020 V

50.045 V

100.1 V

5 A

2 A

1 A

5.0045 A

2.002 A

1.001 A

Constant Voltage (CV) Tests

CV Setup

If more than one meter or if a meter and an oscilloscope are used, connect each to the terminals by a separate pair of leads to avoid mutual coupling effects. For constant voltage dc tests, connect only to +S and -S, since the unit regulates the output voltage that appears between +S and -S, and not between the (+) and (-) output terminals. Use coaxial cable or shielded two-wire cable to avoid noise pickup on the test leads.

Voltage Programming and Readback Accuracy

This test verifies that the voltage programming, GPIB readback and front panel display functions are within specifications. Note that the values read back over the GPIB should be identical to those displayed on the front panel.

a. Turn off the supply and connect a digital voltmeter between the +S and the -S terminals as shown in

Figure 2-1a.

b. Turn on the supply and program the supply to zero volts and the maximum programmable current with the load

off.

c. Record the output voltage readings on the digital voltmeter (DVM) and the front panel display. The readings

should be within the limits specified in the performance test record chart for the appropriate model under CV PROGRAMMING @ 0 VOLTS. Also, note that the CV annunciator is on. The output current reading should be approximately zero.

d. Program the output voltage to full-scale.

e. Record the output voltage readings on the DVM and the front panel display. The readings should be within the

limits specified in the performance test record chart for the appropriate model under CV PROGRAMMING @ FULL SCALE.

CV Load Effect

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

a. Turn off the supply and connect the output as shown in Figure 2-1a with the DVM connected between the +S

and -S terminals.

b. Turn on the supply and program the current to the maximum programmable value and the voltage to the full-

scale value.

c. Adjust the load for the full-scale current as indicated on the front panel display. The CV annunciator on the front

panel must be on. If it is not, adjust the load so that the output current drops slightly.

d. Record the output voltage reading on the DVM connected to +S and -S.

Verification and Performance Tests - 2

e. Open the load and again record the DVM voltage reading. The difference between the DVM readings in steps

(d) and (e) is the load effect voltage, and should not exceed the value listed in the performance test record chart for the appropriate model under CV LOAD EFFECT.

CV Source Effect

This test measures the change in output voltage that results from a change in ac line voltage from the minimum to maximum value within the line voltage specifications.

a. Turn off the supply and connect the ac power line through a variable voltage transformer.

b. Connect the output as shown in Figure 2-1a with the DVM connected between the +S and the -S terminals. Set

the transformer to nominal line voltage.

c. Turn on the supply and program the current to the maximum programmable value and the output voltage to the

full-scale value .

d. Adjust the load for the full-scale current value as indicated on the front panel display. The CV annunciator on

the front panel must be on. If it is not, adjust the load so that the output current drops slightly.

e. Adjust the transformer to the lowest rated line voltage (e.g., 104 Vac for a 115 Vac nominal line voltage input).

f. Record the output voltage reading on the DVM.

g. Adjust the transformer to the highest rated line voltage (e.g., 127 Vac for 115 Vac nominal line voltage input).

h. Record the output voltage reading on the DVM. The difference between the DVM reading is steps (f) and (h) is

the source effect voltage and should not exceed the value listed in the performance test record chart for the appropriate model under CV SOURCE EFFECT.

CV Noise (PARD)

Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac voltage superimposed on the dc output voltage. CV PARD is specified as the rms or peak-to-peak output voltage in the frequency range specified in the User’s Guide.

a. Turn off the supply and connect the output as shown in Figure 2-1a to an oscilloscope (ac coupled) between the

(+) and the (-) terminals. Set the oscilloscope's bandwidth limit to 20 MHz and use an RF tip on the oscilloscope probe.

b. Turn on the supply and program the current to the maximum programmable value and the output voltage to the

full-scale value.

c. Adjust the load for the full-scale current value as indicated on the front panel display.

d. Note that the waveform on the oscilloscope should not exceed the peak-to-peak limits in the performance test

record chart for the appropriate model under CV NOISE (PARD).

e. Disconnect the oscilloscope and connect an ac rms voltmeter in its place. The rms voltage reading should not

exceed the RMS limits in the performance test record chart for the appropriate model under CV NOISE (PARD).

2 - Verification and Performance Tests

Transient Recovery Time

This test measures the time for the output voltage to recover to within the specified value following a 50% change in the load current.

tttt

Unloading

Transient

Figure 2-2. Transient Waveform

a. Turn off the supply and connect the output as in Figure 2-1a with the oscilloscope across the +S and the -S

terminals.

b. Turn on the supply and program the output voltage to the full-scale value and the current to the maximum

programmable value.

c. Set the load to the Constant Current mode and program the load current to 1/2 the power supply full-scale rated

current.

d. Set the electronic load's transient generator frequency to 100 Hz and its duty cycle to 50%.

Loading Transient

e. Program the load's transient current level to the supply's full-scale current value and turn the transient generator

on.

f. Adjust the oscilloscope for a waveform similar to that in Figure 2-2.

g. The output voltage should return to within the specified voltage (v) in less than the specified time (t). Check

both loading and unloading transients by triggering on the positive and negative slope.

Constant Current (CC) Tests

CC Setup

Follow the general setup instructions in the Measurement Techniques paragraph and the specific instructions given in the following paragraphs.

Current Programming and Readback Accuracy

This test verifies that the current programming and readback are within specification.

a. Turn off the supply and connect the current monitoring resistor across the power supply output and the DVM

across the resistor. See "Current Monitoring Resistor" for connection information.

b. Turn on the supply and program the output voltage to 5 V and the current to zero.

c. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to

amps and record this value (Iout). Also, record the current reading on the front panel display. The readings should be within the limits specified in the performance test record card for the appropriate model under CC PROGRAMMING @ 0 AMPS.

d. Program the output current to full-scale .

Verification and Performance Tests - 2

e. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to

amps and record this value (Iout). Also, record the current reading that appears on the front panel display. The readings should be within the limits specified in the performance test record card for the appropriate model under CC PROGRAMMING @ FULL-SCALE.

Current Sink (-CC) Operation

This test verifies current sink operation and readback.

a. Turn off the supply and connect the output as shown in Figure 2-1a, except connect a dc power supply in place

of the electronic load as indicated. Connect the DMM across the current shunt.

b. Set the external power supply to 5 V and the current limit approximately 20% above the full scale current rating

of the supply under test.

c. Turn on the supply under test and program the output voltage to zero and full scale output current. The current

on the UUT display should be approximately full scale current negative.

d. Divide the voltage drop across the current monitoring resistor by its resistance to obtain the current sink value in

amps and subtract this from the current reading on the display. The difference between the readings should be within the limits specified in the performance test record chart under CURRENT SINK READBACK.

Low Range Current Readback Accuracy

This test verifies the readback accuracy of the 20 milliampere current range.

a. Turn off the supply and connect the output as shown in Figure 2-1b. Set the DMM to operate in current mode.

b. Turn on the supply under test and program the output voltage to zero and full scale output current. The current

on the UUT display should be approximately 0 mA.

c. Record the current reading on the DMM and the reading on the front panel display. The difference between the

two readings should be within the limits specified in the performance test record chart under 20mA RANGE CURRENT READBACK ACCURACY @ 0A.

d. Program the output voltage to 20V and record the current reading on the DMM and the reading on the front

panel display. The difference between the readings should be within the limits specified in the performance test record chart for the appropriate model under 20mA RANGE CURRENT READBACK ACCURACY @ 20mA

e. Turn off the supply and connect the output and an external supply as shown in Figure 2-1c. Set the DMM to

operate in current mode.

f. Turn on the external supply and program it to 20 V and 1 amp. Then program the supply under test to zero volts

and 1 amp. The UUT display should read approximately −20 mA.

c. Record the current reading on the DMM and the reading on the front panel display. The difference between the

two readings should be within the limits specified in the performance test record chart under 20mA RANGE CURRENT READBACK ACCURACY @ −20 mA.

CC Load and Line Regulation

These tests (CC Load Effect and CC Source Effect given below) are tests of the dc regulation of the power supply's output current. To insure that the values read are not the instantaneous measurement of the ac peaks of the output current ripple, several dc measurements should be made and the average of these readings calculated. An example of how to do this is given below using an Agilent 3458A System Voltmeter programmed from the front panel. Set up the voltmeter and execute the "Average Reading" program follows:

a. Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER .

b. Program 100 samples per trigger by pressing (N Rdgs/Trig) 1 0 0 ENTER .

2 - Verification and Performance Tests

c. Set up voltmeter to take measurements in the statistical mode as follows:

Press Shift key, f0, Shift key, N Press ^ (up arrow) until MATH function is selected, then press >. Press ^ (up arrow until STAT function is selected then press (ENTER).

d. Set up voltmeter to read the average of the measurements as follows:

Press Shift key, f1, Shift key, N. Press down arrow until RMATH function is selected, then press >. Press ^ (up arrow) until MEAN function is selected, then press ENTER.

e. Execute the program by pressing f0, ENTER, TRIG, ENTER

f. Wait for 100 readings and then read the average measurement by pressing f1, ENTER.

To repeat the measurement, perform steps (e) and (f).

CC Load Effect

This test measures the change in output current for a change in load from full scale output voltage to short circuit.

a. Turn off the supply and connect the output as shown in Figure 2-1a with the DVM connected across the current

monitoring resistor.

b. Turn on the supply and program the current to the full scale current value and the output voltage to the

maximum programmable voltage value.

c. Adjust the load in the CV mode for full scale voltage as indicated on the front panel display. Check that the CC

annunciator of the UUT is on. If it is not, adjust the load so that the output voltage drops slightly.

d. Record the output current reading (DVM reading/current monitor resistance value in ohms). You may want to

use the average reading program described under “CC Load and Line Regulation”.

e. Short the load switch and record the output current reading. The difference in the current readings in steps (d)

and (e) is the load effect and should not exceed the limit specified in the performance test record chart for the appropriate model under CC LOAD EFFECT.

CC Source Effect

This test measures the change in output current that results when the AC line voltage changes from the minimum to the maximum value within the specifications.

a. Turn off the supply and connect the ac power line through a variable voltage transformer.

b. Connect the output terminals as shown in Figure 2-1a with the DVM connected across the current monitoring

resistor. Set the transformer to the nominal line voltage.

c. Turn on the supply and program the current to the full scale value and the output voltage to the maximum

programmable value.

d. Adjust the load in the CV mode for full scale voltage as indicated on the front panel display. Check that the CC

annunciator of the UUT is on. If it is not, adjust the load so that the output voltage drops slightly.

e. Adjust the transformer to the lowest rated line voltage.

f. Record the output current reading (DVM reading/current monitoring resistor in ohms). You may want to use the

average reading program described under “CC Load and Line Regulation”.

g. Adjust the transformer to the highest rated line voltage.

h. Record the output current reading again. The difference in the current readings in steps (f) and (h) is the CC

source effect and should not exceed the values listed in the performance test record card under CC SOURCE EFFECT.

Verification and Performance Tests - 2

CC Noise (PARD)

Periodic and random deviations (PARD) in the output combine to produce a residual ac current, as well, as an ac voltage superimposed on the dc output. Constant current (CC) PARD is specified as the rms output current in a frequency range 20 Hz to 20 Mhz with the supply in CC operation.

a. Turn off the supply and connect the load, monitoring resistor, and rms voltmeter across the monitoring resistor

as shown in Figure 2-1a. The Current Monitoring resistor may have to be substituted by one with a higher resistance and power rating, such as a 1 ohm 50 W current shunt in series with the appropriate 3, 24, or 99 ohm resistor, to get the RMS voltage drop high enough to measure with the RMS voltmeter. Leads should be as short as possible to reduce noise pick-up. An electronic load may contribute ripple to the measurement so if the RMS noise is above the specification a resistive load may have to be substituted for this test.

b. Check the test setup for noise with the supply turned off. Other equipment (e.g. computers, DVMs, etc.) may

affect the reading.

c. Turn on the supply and program the current to full scale and the output voltage to the maximum programmable

value.

d. The output current should be at the full scale rating with the CC annunciator on.

e. Divide the reading on the rms voltmeter by the monitor resistor to obtain rms current. It should not exceed the

values listed in the performance test record card under CC NOISE (RMS).

Performance Test Equipment Form

Test Facility:_________________________

____________________________________ Date _________________________________

____________________________________ Customer _____________________________

____________________________________ Tested By ____________________________

Model ______________________________ Ambient Temperature (C) ________________

Serial No. ____________________________ Relative Humidity (%) ___________________

Options _____________________________ Nominal Line Frequency __________________

Firmware Revision ____________________

Special Notes:

Test Equipment Used:

Description Model No. Trace No. Cal. Due Date

AC Source

DC Voltmeter

RMS Voltmeter

Oscilloscope

Electronic Load

Current Shunt

_________________ _________________ _________________

Report Number ________________________

2 - Verification and Performance Tests

Performance Test Record Forms

Model Agilent 66332A OR Agilent6632B

Test Description Minimum

Constant Voltage Tests

Voltage Programming and Readback

Low Voltage (0V) Vout

Front Panel Display Readback

High Voltage (Full Scale) Vout

Front Panel Display Readback

Load Effect

Source Effect

PARD (Ripple and Noise)

Peak-to-Peak

RMS

Transient Response

Voltage in 100 µs

Constant Current Tests

Current Programming and Readback

Low current (0A) Iout

Readback Accuracy @ Iout

High Current (Full Scale) Iout

Readback Accuracy @ Iout

Current Sink Readback

20 mA Range Current Readback

Readback Accuracy @ 0 A

Readback Accuracy @ + 20 mA

Readback Accuracy @ − 20 mA

PARD (Current Ripple and Noise)

RMS

Load Effect

Source Effect

* Enter your test results in this column

Report No _______________ Date __________________

Specs.

− 10 mV

Vout − 3 mV

19.980 V

Vout − 9 mV

− 2 mV

− 0.5 mV

0 mV

0 mV __________ + 20 mV 3 mV

− 2.0 mA

Iout − 0.5 mA

4.9955 A

Iout − 10.5 mA

Isink − 11.1mA

− 2.5 µA

Iout − 22.5 µA

0 mA __________ + 2.0 mA

− 1.0 mA

− 0.5 mA

Results* Maximum

Specs.

__________

__________ + 2 mV

__________ + 0.5 mV

__________

__________ + 1.0 mA

__________

+ 10 mV

Vout + 3 mV

20.020 V

Vout + 9 mV

+ 3 mV

+ 0.3 mV

+ 2.0 mA

Iout + 0.5 mA

5.0045 A

Iout + 10.5 mA

Isink + 11.1mA

+ 2.5 µA

Iout + 22.5 µA

+ 0.5 mA

Measurement

Uncertainty

1.6 µV

335 µV

20 µV

872 µV

50 µV

15.2 µA

818.7 µA

0.1 µA

1.7 µA

250 µA

2.5 µA

Verification and Performance Tests - 2

Model Agilent 6633B Report No _______________ Date __________________

Test Description Minimum

Specs.

Constant Voltage Tests

Voltage Programming and Readback

Low Voltage (0V) Vout

Front Panel Display Readback

High Voltage (Full Scale) Vout

Front Panel Display Readback

Load Effect

Source Effect

PARD (Ripple and Noise)

Peak-to-Peak

RMS

Transient Response

Voltage in 100 µs

Constant Current Tests

Current Programming and Readback

Low current (0A) Iout

Readback Accuracy @ Iout

High Current (Full Scale) Iout

Readback Accuracy @ Iout

Current Sink Readback

20 mA Range Current Readback

Readback Accuracy @ 0 A

Readback Accuracy @ + 20 mA

Readback Accuracy @ − 20 mA

PARD (Current Ripple and Noise)

RMS

Load Effect

Source Effect

* Enter your test results in this column

− 20 mV

Vout − 6 mV

49.955 V

Vout − 21 mV

− 4 mV

− 1.0 mV

0 mV

0 mV __________ + 50 mV 8 mV

− 1.0 mA

Iout − 0.25 mA

1.998 A

Iout − 4.3 mA

Isink − 4.9 mA

− 2.5 µA

Iout − 22.5 µA

0 mA __________ + 2.0 mA

− 1.0 mA

− 0.25 mA

Results* Maximum

Specs.

__________

__________ + 4 mV

__________ + 1.0 mV

__________

__________ + 1.0 mA

__________ + 0.25 mA

+ 20 mV

Vout + 6 mV

50.045 V

Vout + 21 mV

+ 3 mV

+ 0.5 mV

+ 1.0 mA

Iout + 0.25 mA

2.002 A

Iout + 4.3 mA

Isink + 4.9 mA

+ 2.5 µA

Iout + 22.5 µA

Measurement

Uncertainty

1.7 µV

717.5 µV

35 µV

872 µV

50 µV

15.1 µA

252.5 µA

0.1 µA

1.7 µA

250 µA

1.6 µA

2 - Verification and Performance Tests

Model Agilent 6634B Report No _______________ Date __________________

Test Description Minimum

Specs.

Constant Voltage Tests

Voltage Programming and Readback

Low Voltage (0V) Vout

Front Panel Display Readback

High Voltage (Full Scale) Vout

Front Panel Display Readback

Load Effect

Source Effect

PARD (Ripple and Noise)

Peak-to-Peak

RMS

Transient Response

Time in 100 µs

Constant Current Tests

Current Programming and Readback

Low current (0A) Iout

Readback Accuracy @ Iout

High Current (Full Scale) Iout

Readback Accuracy @ Iout

Current Sink Readback

20 mA Range Current Readback

Readback Accuracy @ 0 A

Readback Accuracy @ + 20 mA

Readback Accuracy @ − 20 mA

PARD (Current Ripple and Noise)

RMS

Load Effect

Source Effect

* Enter your test results in this column

− 50 mV

Vout − 12 mV

99.9 V

Vout − 42 mV

− 5 mV

− 1 mV

0 mV

0 mV __________ + 100 mV 15 mV

− 0.5 mA

Iout − 0.25 mA

0.999 A

Iout − 2.3 mA

Isink − 2.9 mA

− 2.5 µA

Iout − 22.5 µA

0 mA __________ + 2.0 mA

− 1.0 mA

− 0.25 mA

Results* Maximum

Specs.

__________

__________ + 5 mV

__________ + 1 mV

__________

__________ + 1.0 mA

__________ + 0.25 mA

+ 50 mV

Vout + 12 mV

100.1 V

Vout + 42 mV

+ 3 mV

+ 0.5 mV

+ 0.5 mA

Iout + 0.25 mA

1.001 A

Iout + 2.3 mA

Isink + 2.9 mA

+ 2.5 µA

Iout + 22.5 µA

Measurement

Uncertainty

2.1 µV

1.4 mV

60 µV

872 µV

50 µV

15.1 µA

128.8 µA

0.1 µA

1.7 µA

250 µA

1 µA

Troubleshooting

Introduction

WARNING: SHOCK HAZARD. Most of the troubleshooting procedures given in this chapter are performed

with power applied and protective covers removed. Such maintenance should be performed only by service trained personnel who are aware of the hazards (for example, 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 dc power supply. Before attempting to troubleshoot the dc power supply, first check that the problem is with the supply itself and not with an associated circuit. The verification tests in Chapter 2 enable you to isolate a problem to the dc power supply. Troubleshooting procedures are provided to isolate a problem to one of the circuit boards or a particular circuit. Figure 3-2 shows the location of the circuit boards and other major components of the unit. If a problem has been isolated to the A1 Control circuit board, additional troubleshooting procedures are available to isolate the problem to the defective component(s). Disassembly procedures are provided at the end of this chapter and should be referred to, as required, in order to gain access to and/or replace defective components.

If a component is defective, replace it and then conduct the verification test given in Chapter 2.

NOTE: Note that when certain components are replaced, the supply must be calibrated (See "Post Repair

Calibration" later in this chapter). If the A2 Interface Board is replaced, the supply must be initialized before it is calibrated. See "Initialization" later in this chapter.

Chapter 5 lists all of the replaceable parts for the power supplies. Chapter 6 contains schematics, test point measurements, and component location diagrams to aid you in troubleshooting the supply.

3 - Troubleshooting

Test Equipment Required

Table 3-1 lists the test equipment required to troubleshoot the power supply. Recommended models are listed.

Table 3-1. Test Equipment Required for Troubleshooting

Type Purpose Recommended Model

GPIB Controller To communicate with the supply via the

GPIB interface

Digital Voltmeter To check various voltage levels Agilent 3458A

Oscilloscope To check waveforms and signal levels Agilent 54504A/54111A

Electronic Load To test operation of current circuit Agilent 6060B

IC Test Clips To access IC pins AP Products No. LTC

Ammeter/Current Shunt

To measure output current Guildline 9230/15

HP Series 300

Overall Troubleshooting

Overall troubleshooting procedures for the power supply are given in the Figure 3-1. The procedures first check that neither an AC input, nor a bias supply failure is causing the problem and that the supply passes the turn-on self test (error annunciator stays off). The normal turn-on, self-test indications are described in the "Checkout Procedure" in Chapter 3 of the User's Guide.

If the supply passes the self test and there are no obvious faults, you should perform the verification procedures in Chapter 2 from the front panel to determine if any functions are not calibrated or are not operating properly. Then program and read back a voltage via the GPIB to see if the supply responds properly to bus commands. If the supply fails any of the tests, you will be directed to the applicable flow chart or troubleshooting procedure.

Flow Charts

Troubleshooting flow charts are given in Figure 3-1 sheets 1-10. Several flow charts make reference to the test points listed in Chapter 6. The circuit locations of the test points are shown on the schematics and on the component location diagrams in Chapter 6.

Turn on unit and observe the

play

(

)

(

)

dis

. Unit should display all of

the se

ments and annunciators,

the address and then after self

test dis

either an erro

message or go to the meterin

mode.

Display comes

No +5V

on?

A3J2-8?

Yes

3J2-5 held

low?

Troubleshooting - 3

Replace A3 Front

Panel/Dis

board

Yes

Error Message?

Protect

nnunciato

On?

Troubleshoot A1

+5V Interface Bias

circuit, W6 or W7.

See Error Message

Yes

Table 3-2

OV?

OC?

RI?

Replace A2

Interface board

"Troubleshootin

Yes

OV at Turn-on"

sheet 4

Check RI input, A2

Yes

Interface board

Disable OCP and

Yes

check for normal

Yes

Go to

eration

Go to "FS indicated

Go to sheet 2

FS?

For OT check fan

circuit, thermal

sensor RT301

Yes

Replace internal

Fuse blown?

Yes

fuse F300

but fuse is OK"

sheet 6

Figure 3-1 Sheet 1. Main Flowchart

3 - Troubleshooting

(

)

Amp

prog

(

)

Amp

play

(

)

Continued from

sheet 1

Program Voltage

and Current full

scale, enable out

with no load.

Measure Volta

out

ut terminals.

Display and

measured

volta

e OK?

Yes

Load output to put

unit into CC and

measure out

current with extrenal

mete

Display and

measured

current OK?

Yes

Program OV below

output voltage

e at

If output is OK but

Voltage close

to programmed

value?

Output Voltage

near zero?

meter wron

2. If both are off, check

Voltage Monito

, replace

ain of

lifier A1U315B

Yes

Calibrate Voltage

"Troubleshooting No

Out

Yes

Go to

ut Voltage" sheet 7

If output is OK but

meter wrong, replace

2. If in CC but both

are off, check

ain of

Current Monito

lifiers and

Monitor Resisto R403/473 values. If the current is lowe

Current close

rammed

value?

Current > pro

and unit not in

CC?

than programmed

Yes

Calibrate Current

Yes

Go to

"Troubleshooting No

and UNReg is

dis

ed, check

1Q307 and Output

Sta

Current limit"

sheet 10

Go to

"Troubleshootin

OV Trips?

Unit Does not OV”

sheet 11

Yes

Program OV to

maximum and reset

rotection

Go to sheet 3

Figure 3-1 Sheet 2. Main Flowchart (continued)

Troubleshooting - 3

Figure 3-1 Sheet 3. Main Flowchart (continued)

3 - Troubleshooting

pply

(

)

Connect a DC coupled sco

e set to 1mS/20V/

div across the out

and turn on the su

while observing the

sco

e for a momentar

ulse greater than the

ratin

Does the suppl

overshoot?

Disable the OV circuit

as described in

aragragh "Disablin

Protection Features"

Output @ zero

volts?

Yes

4V @ A1R350-2?

Yes

Go to “Troubleshootin

Yes

High Output Voltage”

2 or W7 Defective

sheet 7

Check C336, R356,

+.3V @ U306B-7?

R351, R349

1-2) and

U306B

Yes

Check C335, R354,

+4V @ U306-8?

Yes

R350

1-2) and U306B

Go to sheet 5

Figure 3-1 Sheet 4. OV at Turn-On

Continued from

sheet 4

Connect a DC coupled

scope across the

output and press

Protect Clear several

times while observing

the scope

Pulses high?

Go to "Troubleshooting

Yes

High Output Voltage"

(sheet 12)

Troubleshooting - 3

1U306B-2,

OV_Detect*, High?

Yes

1R438,

OV_SCR*, +0.6V?

Yes

Check A1CR342,

Q318A, B & D and

associated

components

U306B-8 3.8V?

Check OV_Prog,

Imon_Comp, C335,

R350, R354

Check R441, Q318B,

2, Interface Board

Yes

U306B-7 < pin 8?

Yes

Check U306B, A2

Check R349, R351,

R356

Note: OV_SCR* is

normally a pulse that

goes low for 5us to trip

the OV SCR, CR342.

Figure 3-1 Sheet 5. OV at Turn-On (continued)

3 - Troubleshooting

)

(app

put)

(

prog

(

)

Program output on,

volta

e and current full

scale then check

out

ut voltage

FS Prot off and

Out

ut OK?

Disable the protection

feature b

simultaneousl

ressing the 0 and 9

s, press the ^ ke

until the display reads

"No Protect Off", press

the U

Arrow to displa

"No Protect On" then

ress ente

Output V >

rammed

value?

Check FUSE signal

U305B-7

rox.

+2.8V with 20V out

Yes

Calibrate unit

Go to "Troubleshootin

Yes

High Output Voltage"

sheet 12

Troubleshoot Fuse

divider and amplifie

FUSE signal OK?

circuit (R393/394,

U305

Yes

Problem may be

defective A2 or one of

the volta

es to A2

Vmon, Imon_H,

Imon

L, Imon_P) > its'

bias volta

e +5Vs

Figure 3-1 Sheet 6. FS Indicated but Fuse OK

Program full scale

voltage and current

and enable output.

Measure output

voltage with an

external voltmeter.

Troubleshooting - 3

Display zero V but

output OK?

CV or CC

nnunciator on?

Q305A base

-11.4V ?

Yes

Check W7 (Vmon) and

Yes

2, Interface board

CC?Yes

Go To sheet 9

PM_Inhibit, R335

Low

Yes

Troubleshoot Turn-On

Control Circuit, Q305B,

C, D and U305A

Yes

Displays current

equal to prog

value?

CC_Prog, R360

-4.7V

Check for short across

Yes

output such as output

cap C382, CR342, etc.

Check W7, A2

Interface Board

Yes

IMon_H,

U309A-6,~0V

Check Positive Current

Yes

Control Circuit, U310B

Check High Range

Current Monitor Amp,

U309A

Check W7, A2

Interface Board

Go to sheet 8

Figure 3-1 Sheet 7. No Output Voltage

3 - Troubleshooting

Continued from

sheet 7

Q302 base

-5V ?

Yes

Q303 base >1.2V

(meas. from +Out)

>1V across R323

Yes

Q307 collector to

emitte

4V?

Check C330, R333,

Yes

R346, and Q302

Check +Rail and

Output Stage

Check Q301, Q305

Check Q302, Q307,

R324 and R326

circuits

Yes

Check C331, C333,

C339 and Q306

circuits

Figure 3-1 Sheet 8. No Output Voltage (continued)

Continued from

Amp

sheet 7

Troubleshooting - 3

CV_Prog @ R401

-4.7V ?

Yes

VMon,

U315B-7

~0V

Yes

Check Voltage Control,

Circuit U315

Check W7, A2

Interface Board

Check Voltage Monito

lifier, U315B,

circuit

Figure 3-1 Sheet 9 No Output Voltage (continued)

3 - Troubleshooting

Amp

Continued from

sheet 2

CC_Prog, R360,

-4.8V ?

Yes

Check A2 Interface

Board

Imon_H, U309A-6

~+3.5V

Yes Yes

Check Positive Current

Control Circuit

Drop across R473

Check High Range

Current Monito

~0.25V

lifie

Check R473

Figure 3-1 Sheet 10. No Current Limit

Program the output

)

voltage and current to

the full scale value and

the OV to 1/2.

Troubleshooting - 3

OV_prog ~+2V

R350

Yes

U306B-8

~+2V

Yes

U306B-7

~+4V

Yes

U306B-2,

DETECT*,

Low?

Yes

See note

OV_SCR* pulse @

R438 low 5us

2 Interface Board o

cable W7 defective

Check R350, C335 and

U306B

Check R349, R351,

R356, C336 and U306

Check U306B

Check Q318B, R441,

2 Interface Board

Reset the OV (Shift,

Prot Clr) and observe

the OV

SCR* signal.

Each time OV is reset

the unit will

another OV si

ulse (OV_SCR*

enerate

nal. The

is approximately 5us

lon

Yes

Q318D Collector

pulses high 5us

Check Q318A, B and D

and associated circuits

Yes

Check A1CR342

Figure 3-1 Sheet 11. Unit Does Not OV

3 - Troubleshooting

Amp

Disable the OV capability b

shorting R351. After the

rotection is disabled, program

the output voltage to zero,

current to full scale and Output

ON. If the unit is in "Protect"

mode, Press Protect Clear. The

output should now go high and

not trip the OV.

* V_mon should be approximatel

6632B or 66332A Vout/4.25 6633B Vout/10.52 6634B Vout/21

Is the CV

annunciator on

Yes

Measure voltage at the

base of Q303 with

respect to its' emitte

Voltage <0.6V

Vmon,

U315B-7,

OK ?*

Yes

CV_Prog,

R401

~0V

Yes

Check Voltage Control

U315A, circuit

Troubleshoot Voltage

Gain Stage

Check Voltage Monito

lifier, U315B

circuit

2 Interface Board

Yes

Troubleshoot Output

Sta

Figure 3-1 Sheet 12. High Output Voltage

Troubleshooting - 3

Specific Troubleshooting Procedures

Power-on Self-test Failures

The power-on self-test sequence tests 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 3-2 lists the self test errors and gives the probable cause for each error.

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 3-2. Self-Test Error Codes/Messages

Error Code Description Probable Cause

E1 Checksum in Read-only Non-volatile ROM A2 Interface Bd

E2 Checksum in Config Non-volatile ROM A2 Interface Bd

E3 Checksum in Cal Non-volatile ROM A2 Interface Bd

E4 Checksum in State Non-volatile ROM A2 Interface Bd

E5 Checksum in RST Non-volatile ROM A2 Interface Bd

E10 RAM test failed A2 Interface Bd

E11 12 bit DAC test failed, 0 is written to DAC U241A and B,

ADC U242 is checked for 133 +/- 7 counts

E12 12 bit DAC test failed, 4095 is written to DAC U241A

and 0 to B, ADC U242 is checked for 71 +/- 7 counts

E13 12 bit DAC test failed, 0 is written to DAC U241A and

4095 to B, ADC U242 is checked for 71 +/- 7 counts

E14 12 bit DAC test failed, 4095 is written to DAC U241A

and B, ADC U242 is checked for 10 +/- 7 counts

E15 8 bit DAC test failed, 10 and 240 are written to DAC

U244, ADC U242 is checked for 10 and 240 +/- 7 counts

E80 Dig I/O test failed, SEC_PCLR written low and high,

read back through Xilinx

E213 RS-232 input buffer overrun A2 Interface Bd

E216 RS-232 framing error A2 Interface Bd

E217 RS-232 parity error A2 Interface Bd

E218 RS-232 UART input overrun A2 Interface Bd

E220 Front Panel comm UART input overrun A3 Front Panel/Display Bd

E221 Front Panel comm UART framing error A3 Front Panel/Display Bd

E222 Front Panel comm UART parity error A3 Front Panel/Display Bd

E223 Front Panel firmware input buffer overrun A3 Front Panel/Display Bd

A2 Interface Bd

3 - Troubleshooting

CV/CC Status Annunciators Troubleshooting

The CV/CC annunciators are particularly helpful when troubleshooting a unit with no output. If the unit has no output voltage or current and one of the annunciators is on then the problem is in the control circuit associated with that annunciator. An example of how this might be useful would be in a case where the voltage and current are programmed to some positive value, there is no output voltage and the CV annunciator is on. This indicates that the problem is probably in the Voltage Amplifier circuit. If the CC annunciator were on then the problem would likely be in the Current Amplifier. If UNR is indicated then neither the voltage nor the current circuits are in control and the problem would be in circuits after the gating diodes such as the driver or output regulator stages.

When troubleshooting the CV/CC status annunciators or the status readback circuits, first measure the voltage drop across the gating diodes; A1 D328 (CV) and D325 (CC). A conducting diode indicates an active (ON) control circuit. This forward drop is applied to the input of the associated status comparator (U306A and D respectively) and drives the output (CV_DETECT* or CC_DETECT*) low. The low signal indicates an active status which is sent to the A2 board microprocessor. The front panel CV annunciator indicates when the CV mode is active (CV_DETECT* is low). The front panel CC annunciator indicates when the CC mode is active (CC_DETECT* is low). The UNREGULATED (UNR) annunciator comes on when neither the CV nor CC is active.

Bias and Rail Voltages

Before troubleshooting any circuit check the bias and/or rail voltages to make sure that they are not the cause. Table 3-3 lists the bias and rail voltage test points for the A1 Main Control , A2 Interface, and the A3 Front Panel/Display boards. Unless otherwise noted, all voltages are measured with respect to secondary common (R473-3) with no load on the supply.

Table 3-3. Bias and Reference Voltages

Bias Test Point

Common Measurement

(See Figure 6-1)

+Rail1 (Agilent

A1 TP 310 - Output +38V 10% (800mV P/P)

6632B/66332B)

+Rail1 (Agilent 6633B) A1 TP 310 - Output +73V 10% (2.5V P/P)

+Rail1 (Agilent 6634B) A1 TP 310 - Output +130V 10% (2.2V P/P)

-Rail1 (Agilent

A1 TP 311 - Output -9.8V 10% (400mV P/P)

6632B/66332B)

-Rail1 (Agilent 6633B) A1 TP 311 - Output -10.2V 10% (300mV P/P)

-Rail1 (Agilent 6634B) A1 TP 311 - Output -10.5V 10% (300mV P/P)

+5V secondary A1 R317 Secondary Common +5V 4%

+12V secondary A1 D470 cathode Secondary Common +12V 5%

+15V secondary A1 R318 Secondary Common +15V 4%

-12V secondary A1 D471 anode Secondary Common -12V 5%

-15V secondary A1 R315 Secondary Common -15V 4%

V_Ref A1 R475 Secondary Common +2.5V 6%

+5V Interface

Measured with respect to - Output at nominal ac input line voltage

Measured with reference to Interface Ground (E306 black wire)

E306 (red wire) E 306 (black wire) +5V 3%

Troubleshooting - 3

J307 Voltage Measurements

J307 connects the A1 Main Board Assembly to the A2 Interface Assembly. Table 3-4 provides a quick method of determining if the voltages between these assemblies are within the normal range. If any of these voltages is outside the normal range, refer to the flowcharts to further troubleshoot the circuit associated with the abnormal voltage.

Table 3-4. Voltage Measurements at J307 (A2 Interface to A1 Main board)

A1J307

Pin #

1 PM_INHIBIT (Enabled) 0 0

2 OV_SCR* +5 +5

3 OV_PROG +3.9 +3.9

4 FAN_PROG +2.8 +3.8

5 OV_DETECT* +5 +5

6 SW_POS (Norm) +5 +5

7 RANGE_SELECT (High) 0 0

8 OS_TRIM_NEG (COMP) +1.7 +1.7

OS_TRIM_NEG (SCPI) +4.0 +4.0

9+5Vs +5 +5

10 COMMON 0 0

11 COMMON 0 0

12 +15Vs +15 +15

13 -15Vs -15 -15

14 HS_THERM (@25C) +2.5 +2.5

15 FUSE +2.4 +2.6

16 IMON_H 0 +3.5

17 IMON_L

IMON_L (@20mA Out)

18 IMON_P 0 0

19 VMON +4.8 +4.8

20 COMMON 0 0

21 COMMON 0 0

22 COMMON 0 0

23 COMMON 0 0

24 CV_PROG -4.8 -4.8

25 CC_PROG -4.8 -4.8

26 CC_DETECT* +5 0

27 CCN_DETECT* +5 +5

28 CV_DETECT* 0 +5

Signal Name CV Mode

Full Scale Voltage

No Load

+4.8

CC Mode

Full Scale Voltage

Full Load

+14.7

+4.8

3 - Troubleshooting

Manual Fan Speed Control

Under some circumstances such as testing acoustical devices where the fan noise would interfere with the test, it would be advantageous to reduce the fan speed. If the test requires a very light load, the ambient temperature is low and the duration of the test is short, the fan speed may be temporarily reduced. The turn-on default is "Automatic" so this procedure must be performed, as needed, every time the line voltage is turned on. To manually control the fan speed:

a. Simultaneously depress the "0" and "9” keys. EEINIT <model> will be displayed.

b. Using the Up/Down annunciator keys select FAN:MODE<AUTO.>.

c. Using the Up/Down arrows select FAN:MODE <MAN>

d. Press "Enter"

e. Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

f. Using the Up/Down annunciator keys select FAN:SPEED <data>

g. Press "Enter Number".

h. Enter the desired speed (numeric entry range is 0 to 100%)

i. Press "Enter"

Disabling Protection Features

Except for overvoltage protection, the power supply's protection features may be disabled. This is not recommended as a normal operating condition but is helpful under some circumstances such as troubleshooting. The turn-on default is "NO-PROTECT OFF" (protection enabled) so this procedure must be performed, as needed, every time the line voltage is turned on. To disable the protection:

a. Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

b. Using the Up/Down annunciator keys select NO-PROTECT <OFF>.

c. Using the Up/Down arrows select NO-PROTECT <ON>.

d. Press "Enter"

Troubleshooting - 3

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. A1 Control Board: Voltage or Current Monitor Amplifier circuits, High Bandwidth Current Amplifier, or

Current Monitor resistors R403/R473

b. A2 Interface Board

If the Interface board A2 is replaced, the supply must be initialized first (see "Initialization" later 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.

This four-section switch, S201, is located on the A2 Interface board near the GPIB connector. The switch has 2 functions related to calibration. One is Inhibit Calibration. With this switch set the supply will not respond to calibration commands, thus providing security against unauthorized calibration. The other switch allows you to bypass the password in case it is forgotten.

Switch 3 Switch 4

Off Off

Off On

On Off

4 3 2 1

S201

Normal

Clear Password

Inhibit Calibration

Calibration Password

In order to enter the calibration mode, you must use the correct password as described in Appendix B of the Operating Manual. As shipped from the factory, the number 0 (zero) is the password. If you use an incorrect password, "OUT OF RANGE" will appear on the display for front panel calibration (or error code 402 occurs for GPIB calibration) and the calibration mode will not be enabled.

If you have changed the password and have forgotten it, you can set the configuration switch on A2 Interface board to bypass the password. See "Calibration Switch" paragraph above.

3 - Troubleshooting

Initialization

The dc power supply's GPIB address and model number as well as other constants which are required to program and calibrate the supply are stored in a EEPROM on the A2 Interface board. The Interface board also contains references and other components that will affect the alignment of the supply. If the Interface board is replaced, the supply must be reinitialized and calibrated. To initialize the power supply:

a. Enable the Calibration mode

b. Simultaneously depress the "0" and "9” keys.

c. Using the Up/Down arrows select the appropriate model number

d. Press "Enter"

The dc power supply will go through the turn-on self test sequence. It is now re-initialized and must be calibrated. See Appendix A of the User’s Guide for the calibration procedure.

ROM Upgrade

Identifying the Firmware

You can use the *IDN? query to identify the revision of the supply's firmware. The query will readback the revisions of the Primary Interface ROM located on the A2 Interface board. The manufacturer and model number of the supply are also returned. The following is a sample program:

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

The computer will display the manufacturer's name, the model number, a "0," and then the firmware revision. Example: "AGILENT TECHNOLOGIES,66332A,0,A.00.01". The revision level of the ROM can also be found on the label affixed to the physical IC chip itself.

Upgrade Procedure

If the Interface board ROM is upgraded you can re-initialize the supply without affecting the calibration.

a. Enable the Calibration mode.

b. Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

c. Using the Up/Down annunciator keys select ROMUPD <model>.

d. Using the Up/Down arrows select the appropriate model number.

e. Press "Enter".

The supply will go through the turn-on self test sequence and return to the power supply metering mode.

Troubleshooting - 3

Disassembly Procedures

The following paragraphs provide instructions on how to disassemble various components of the dc power supply. Once disassembled, the components can be reassembled by performing the disassembly instructions in reverse order. Figure 3-2 shows the location of the major components of the unit.

Figure 3-2. Component Location

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 and 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 the list of required tools when performing disassembly and replacement.

List of Required Tools

a. 2PT Pozidriv screwdrivers.

b. T10 and T15 Torx screwdrivers.

c. Hex drivers: 7 mm for GPIB connector,

3/16" for RS-232 connector, 1/4" for front panel binding posts

d. Long nose pliers.

e. Antistatic wrist discharge strap.

3 - Troubleshooting

Cover, Removal and Replacement

a. Using a 2TP Pozi screwdriver, unscrew the two screws that hold the carrying straps to the power supply, and

then remove the two screws from the opposite side of the case.

b. To remove the cover, first spread the bottom rear of the cover slightly and push from the front panel

c. Slide the cover backward until it clears the rear of the power supply.

A2 Interface Board, Removal and Replacement

To remove the Interface Board, proceed as follows:

a. Remove the cover of the power supply as described under, "Cover Removal and Replacement."

b. Remove the two 7 mm and 3/16 inch hex screws that hold the GPIB and RS-232 connectors in place.

c. Unplug the cable from J206. Depress the release button located at the end of the connector where the wires enter

the housing.

d. Unplug the flat cables. Note the position of the conductive side for reinstallation. Connectors release the cable

by pulling out end tabs as shown by the arrows in the following figure.

e. Lift the board off of the snap-in standoffs.

f. To reinstall the Interface board, perform the above steps in reverse order.

Front Panel Assembly, Removal and Replacement

This procedure removes the front panel assembly from the dc power supply.

a. Remove the Power Supply Cover as described earlier in, "Top Cover Removal and Replacement."

b. Disconnect the cable between the Front Panel board and the Interface board at the Interface board.

c. Carefully peel off the vinyl trim strips on each side of the front panel that cover the front panel screws.

d. Using a Torx T10 driver remove the two screws (one on each side) that hold the front panel assembly to the

chassis.

e. Slide the Front Panel assembly forward and away from the chassis to access the S1 power switch.

f. Disconnect the wires going to the S1 switch assembly. For reassembly, make a note of the color coding of the

wires and the pins to which they are connected.

g . If the supply has front panel binding posts, unplug the cable from the binding post connector and use a Torx T15

driver to remove the screw connecting the ground wire to the chassis.

f. You can now remove the front panel assembly from the supply.

g. To reinstall the Front Panel Assembly, perform the above steps in reverse order.

Troubleshooting - 3

S1 Line Switch, Removal and Replacement

a. First remove the front panel assembly as described under “Front Panel Assembly, Removal and Replacement.”

b. Release the switch from the front panel by pressing the locking tabs inward against the body of the switch and

pushing the switch out of its opening.

NOTE: When reinstalling the switch, make sure that the letter “O” is facing up when the switch is installed

in its opening.

A3 Front Panel Board, Removal and Replacement

First remove the front panel assembly as described under, "Front Panel Assembly, Removal and Replacement." Once you have access to the front panel board perform these steps:

a. Remove the RPG knob by pulling it away from the front panel.

b. Use a Torx T10 driver to remove the screw that secures the board to the front panel assembly.

c. Slide the board to the left to disengage the holding clips, then lift it out.

d. To reinstall the Front Panel board, perform the above steps in reverse order.

A1 Main Control Board

a. Remove the top cover and the A2 Interface board as previously described.

b. Disconnect all cables going to connectors on the main control board.

NOTE: Be sure to note the position and orientation of all cables prior to removal so that no mistake is

made later when reinstalling these cables.

c. If your power supply is equipped with a relay option board, remove the Torx T10 screw that holds the relay

board bracket.

d. Remove four Torx T15 screws that secure the main control board to the chassis.

e. Slide the main board towards the front panel to release it from chassis mounted standoffs and then lift the board

out of the chassis.

T1 Power Transformer, Removal and Replacement

To remove the power transformer, the front panel assembly must first be removed to gain access to the bracket screws that hold the transformer in place.

a. Remove the three Torx T10 screws securing the rear of the transformer bracket to the bottom of the chassis and

the two Torx T10 screws securing the front of the transformer to the chassis.

b. Use long nose pliers to disconnect all wires going to the transformer terminals.

c. Lift the transformer out of the chassis.

NOTE: The AC power connections at the transformer primary are line voltage dependent. Refer to Figure

3-3 subsequent reconnection.

3 - Troubleshooting

Line Voltage Wiring

Figure 3-3 illustrates the primary wiring configuration of the power transformer for various ac line voltages. Use long nose pliers to disconnect the wires going to the transformer terminals.

NOTE: Install the correct fuse when changing the ac line voltage from a previous setting:

for 110/120 Vac: 4 AM, Agilent p/n 2110-0055; for 220/230 Vac: 2 AM, Agilent p/n 2110-0002

white/red/grey

spare

jumper

white/red/grey

jumper

grey

white/red/grey

jumper

grey

white/red/grey

jumper

white/blue

yellow

blue

white

white/grey

grey

white/red

orange

white/green

Figure 3-3. Transformer Wiring

Principles of Operation

Introduction

This section describes the different functional circuits used in the dc power supply models covered in this manual. First, the I/O external signals that connect to the Agilent power supply are described. Next, the overall block diagrams for the dc power supply are described in detail.

The simplified block diagrams in this section show the major circuits on the dc power supply as well as the signals between circuits. They also show the reference designations of some of the components in the functional circuit. These same reference designators are shown in the schematic diagrams in Section 6.

I/O Interface Signals

Table 4-1 describes the interface signals between the power supply and the end user (or other external circuits and devices).

Table 4-1. Power Supply Interface signals

Connector Signal Description

Front panel outputs +OUT

-OUT

Rear panel output/sense screw terminals

INH/FLT connector

RS-232 connector XON-XOFF

GPIB connector GPIB/IEEE 488 Provides the interface to an external GPIB controller

Ac input connector ac mains Can be 100 Vac, 120 Vac, 220 Vac or 240 Vac Input

+OUT

-OUT + sense

- sense common

pin 1 pin 2 pin 3 pin 4

RTS-CTS DTR-DSR NONE

Positive DC output voltage Negative DC voltage (or return)

Positive DC output voltage Negative DC voltage (or return) +OUT sensing terminal

-OUT sensing terminal connected to ground conductor

FLT/INH mode FLT output OUT 0 FLT Common OUT 1 INH Input IN 2/OUT 2 INH Common Common

as-shipped configuration

uses ASCII control codes DC# and DC1 uses Request-To-Send and Clear-To-Send lines uses Data-Terminal-Ready and Data-Set-Ready lines there is no flow control

Digital I/O mode

4 - Principles of Operation

A3 Front Panel Circuits

As shown in Figure 4-1, the supply's front panel assembly contains a circuit board, a keypad, a liquid crystal display (LCD), and a rotary control (RPG) for the output voltage and current. With the exception of the RPG (A3G1), the A3 Front Panel board is an assembly-level replaceable part. A separate front panel binding post board is also included on the unit. It is also available as an assembly-level replaceable part.

The A3 front panel board contains microprocessor circuits, which decode and execute all keypad and RPG commands that are transferred to the power supply output via the serial I/O port to the primary interface circuits on the A2 interface board. The front panel microprocessor circuits also process power supply measurement and status data received on the serial I/O port. This data is displayed on the LCD.

A2 Interface Circuits

The circuits on the A2 interface board provide the interface between the GPIB interface, RS-232 interface, and front panel interface and the dc power supply. Communication between the power supply and a GPIB controller is processed by the GPIB interface and the primary microprocessor circuits on the A2 board. The A2 Interface board is assembly-level replaceable; it contains no user-replaceable parts.

With the exception of the front panel microprocessor, all digital circuits, analog-to-digital converters (ADC) and digital-to-analog converters (DAC) in the dc power supply are located on the A2 Interface board. All control signals between the A2 interface board and the A1 main board are either analog or level signals.

Primary Interface

The primary microprocessor circuits (DSP, ROM, and RAM chips) decode and execute all instructions and control all data transfers between the controller and the secondary interface. The primary microprocessor circuits also processes measurement and status data received from the secondary interface.

A Dual Asynchronous Control chip on the A2 board converts the RS-232, RI/DFI, and front panel data into the primary microprocessor's 8-bit data format. The serial data is transferred between the primary interface and the secondary interface via a serial bus and optical isolator chips. These chips isolate the primary interface circuits (referenced to earth ground) from the secondary interface circuits.

Secondary Interface

The secondary interface circuits include a programmed logic array, EEPROM, boot-ROM, 8 and 12-bit DAC circuits, and 8 and 16-bit ADC circuits. The programmed logic array translates the serial data received from the primary interface into a corresponding digital signal for the appropriate DAC/ADC circuits. The logic array is also connected directly to four DAC/ADC circuits. Under control of the logic array, the selected DAC converts the data on the bus into an analog signal. Conversely, the selected ADC converts the analog signals from the A1 board into a digital signal.

The logic array also directly receives status information from the A1 main board via three level-sensitive signal lines, which inform the array of the following operating conditions: constant voltage mode (CV_Detect*), constant current mode (CC_Detect*), negative current mode (CCN_Detect*), and overvoltage (OV_Detect*). The PM_Inhibit control signal is used to shut down the bias voltage to the output stages and keep the power supply output off. The OV_SCR* control signal is used to fire the SCR and keep the power supply output off when an overvoltage condition has occurred.

Principles of Operation - 4

Figure 4-1. A2/A3 Block Diagram

4 - Principles of Operation

The EEPROM (electrically erasable programmable read-only memory) chip on the A2 interface board stores a variety of data and configuration information. This information includes calibration constants, GPIB address, present programming language, and model-dependent data, such as the minimum and maximum values of voltage and current. One of the EEPROM storage locations holds a checksum value which is used to verify the integrity of the EEPROM data. Access to the calibration data in the EEPROM is controlled by the combination of a password and switch settings on A2S201, located on A2 interface board (See Chapter 3 "Inhibit Calibration Switch").

The Dual 12-bit DAC converts the programmed value of voltage and current on the bus into the CV_Prog and CC_Prog signals, which are sent to the CV control circuits in order to control the magnitude of the output voltage in the CV mode and output current in CC mode. The CV_Prog and CC_Prog signals are in the 0 to -5 V range, which corresponds to the zero to full-scale output ratings of the dc power supply.

The Quad 8-bit DAC converts programmed information for the following circuits into analog format: negative offset trim (OS_Trim_Neg), overvoltage setting (OV_Prog), current measurement range select (Range_Select), and fan speed programming (Fan_Prog). The OS_Trim_Neg signal allows the negative current control circuit to be calibrated at zero. The OV_Prog signal is applied to the OV detect circuit, which compares the programmed overvoltage setting with the actual output voltage. The Range_Select signal selects either the high or the low (20mA) measurement range. The Fan_Prog signal is applied to the fan speed control circuit in order to speed up the fan as temperature increases, and to slow the fan speed down as temperature decreases.

The 16-bit ADC in conjunction with a 4x1 multiplexer returns data from the following measurement signals to the logic array: monitored output voltage (VMon), monitored high-range current (Imon_H), monitored low-range current (Imon_L), and monitored peak current (Imon_P). All measurement signals are in the range of 0 to +5V, which corresponds to the zero to full-scale readback capability of the dc power supply.

The 8-channel, 8-bit ADC returns the following signals to the logic array: high-range output current (Imon_H), high range negative current (Imon_H-), overvoltage (V_Mon), ambient temperature (Temp_Amb), heatsink temperature (HS_Therm), and output fuse state (Fuse). Five of these signals are for fan control. The logic array varies the Fan_Prog signal depending upon the ambient temperature, the heatsink temperature, and the present output voltage and current. The Fuse signal informs the logic array if the output fuse (F300) is open.

A1 Main Board Circuits

Power Circuits

As shown in Figure 4-2, the power circuits consist of: input power rectifiers and filter, current-monitoring resistors, an output stage, a voltage gain stage, an overvoltage SCR, and an output filter.

The ac input rectifier and filter converts ac input to a dc level. The output stage regulates this dc level at the output of the power supply. The output stage has up to four parallel NPN transistors mounted on a heatsink and connected between the +Rail and the +Output. These transistors are driven to conduct by a positive-going signal from driver Q303 (located in the voltage gain stage). The output stage also has up to four parallel PNP transistors mounted on a heatsink and connected between the +Rail and the -Rail. These transistors are driven to conduct by a negative-going signal from driver Q304 (located in the voltage gain stage).

The voltage gain stage is controlled by a signal from the control circuits. A positive-going signal to the voltage gain stage makes the output more positive. A negative-going signal to the voltage gain stage makes the output more negative. The Turn-on control signal to the voltage gain stage simply keeps the output of the unit turned off for about 100 milliseconds at power turn-on while the microprocessor is initializing the unit.

Principles of Operation - 4

Figure 4-2. A1 Block Diagram

4 - Principles of Operation

Two current shunt resistors monitor the output current. RmHi (R473) monitors the high current range; RmLo (R403) monitors the low current range. Shunt clamps, connected in parallel across RmLo, turn on at approximately 25 mA to limit the voltage drop at high currents. The Range_Select signal sets the level at which switching occurs. The output of the current monitor drives the level.

The SCR, connected across the output, will fire and short the output when an overvoltage condition is detected. The SCR is controlled by the OV_SCR* signal from the crowbar control circuit (described in the next section).

The output filter capacitor provides additional filtering of the dc output.

Control Circuits

As shown in Figure 4-2, the control circuits consist of the CV/CC controls, output voltage/current monitor, bias supplies, and SCR control.

The CV/CC control circuits provide a CV control loop, a positive CC control loop, and a negative CC control loop. For any value of load resistance, the supply must act either as a constant voltage (CV) or as a constant current (CC) supply. Transfer between these modes is accomplished automatically by the CV/CC control circuit at a value of load resistance equal to the ratio of the programmed voltage value to the programmed current value. The negative CC control circuit is activated when a current source such as another power supply is connected across the output terminals and its voltage is greater than the programmed voltage. A low level CV_Detect*, CC_Detect*, or CCN_Detect* signal is returned to the secondary interface to indicate that the corresponding mode is in effect.

When the CV loop is in control, diode D328 is conducting current. Voltage regulation is accomplished by comparing the programmed voltage signal CV_Prog with the output voltage monitor signal Vmon. The Vmon signal is in the 0 to +5 V range, which corresponds to the zero to full-scale output voltage range of the supply. If the output voltage exceeds the programmed voltage, Vmon goes high and produces a more negative-going CV signal, which reduces the input to the voltage gain stage and lowers the output voltage. Conversely, if the output voltage is less than the programmed voltage, Vmon goes low and produces a more positive-going CV signal, which increases the input to the voltage gain stage and raises the output voltage. Depending upon the position of the sense switch, the output voltage is either monitored at the supply's output terminals (local), or at the load (remote) using the +S and -S terminals with remote sense leads connected to the load. If the output voltage goes higher than the programmed value, the unit starts sinking current to reduce the output voltage.

When the CC loop is in control, diode D325 is conducting current. Current regulation is accomplished by comparing the programmed current signal CC_Prog with the output current monitor signal Imon_H. The Imon_H signal is produced by measuring the voltage drop across the current monitoring resistor and is in the 0 to +5 V range, which corresponds to the zero to full-scale output current range of the supply. If the output current exceeds the programmed current, Imon_H goes high and produces a more negative going CC signal, which reduces the input to the voltage gain stage and lowers the output current. Conversely, if the output current is less than the programmed current, Imon_H goes low and produces a more positive-going CC signal, which increases the input to the voltage gain stage and raises the output current.

When the supply is sinking current, only the CV control circuit or the CCN control circuit can be active. In this case, the supply is acting as a load instead of a power source and will attempt to pull the output voltage down by drawing off current from the externally applied source. The current that will be drawn from the externally supplied source is determined by the CC_Prog signal. When the current required to reduce the voltage is less than the programmed current value, the CV control circuit is active and regulates the output voltage. When the current required to reduce the voltage exceeds the programmed current value, the CCN control circuit is active. It regulates the output current by comparing the negative Imon_H signal to the inverted CC_Prog signal.

During operation, a PM_Inhibit signal will cause the turn-on control to turn off the bias to the voltage gain stage and shut down the output if any of the following occur:

Principles of Operation - 4

The output is programmed off.

An overvoltage condition is detected (OV_Detect* signal is received).

The line voltage falls below 90 volts (approximately).

Current readback is provided by three separate circuits. The previously discussed high range current signal (Imon_H) returns the high range current measurement. When the unit is operating in the low current readback mode, a separate low range current shunt and amplifier provides low-current readback via the Imon_L signal. The Range_Select signal drives shunt clamps Q304 and Q305, which clamp the voltage across RmLo to approximately 1.8 V. A third current readback circuit is available on the Agilent 66332A unit. It consists of a high bandwidth current amplifier that returns dynamic current measurements from the output filter capacitor via the Imon_P signal. Note that the Imon_H and the Imon_P signal are combined to return the actual output current measurement.

An overvoltage detect circuit compares the output voltage to the programmed overvoltage setting. When the output exceeds the programmed setting, the OV_Detect* signal goes low, which informs the logic array that an OV condition has occurred. The crowbar control circuit is enabled when the OV_SCR* signal is received. When an overvoltage condition occurs, the SCR control circuit generates the OV signal, which causes the following actions to occur:

1. The SCR fires, shorting the supply's output.

2. The microprocessor circuits are notified of the OV condition (OV_Detect* is low) in order to program the output off, turn off the gain stage bias, and update the status of the unit.

3. When a output protection clear command is executed, the microprocessor circuits resets the OV circuits, turns on the gain stage bias, and programs the output to its previous level.

The fan driver control circuit provides the DC voltage to operate the cooling fan. The Fan_Prog signal from the secondary interface circuit varies this voltage according to the ambient and heatsink temperature as well as the output voltage and current of the supply.

Replaceable Parts List

Introduction

This section lists the replaceable parts for Agilent Models 66332A, 6632B, 6633B, and 6634B power supplies. Refer to Figures 5-1 for the location of mechanical parts with the reference designators MP. Refer to the board location diagrams in Chapter 6 for the location of electrical parts.

Table 5-1. Chassis, Electrical

Designator Model Part_Number Qty Description

A1 66332A/6632B 5063-3431 1 Control PCA, Tested A1 6633B 06633-61023 1 Control PCA, Tested A1 6634B 06634-61023 1 Control PCA, Tested A2 66332A 5063-3439 1 Interface PCA, Tested A2 6632B/6633B/6634B 5063-3429 1 Interface PCA, Tested A3 All 5063-3432 1 Front Panel PCA, Tested A4 6633B/6634B 5063-3406 1 Binding Post PCA A4 66332A/6632B 06611-60022 1 Binding Post PCA A5 All 5063-3433 1 AC Input/RFI PCA A6 All 5063-3434 1 Relay PCA, Tested B1 All 06632-60002 1 Fan Assembly T1 66332A/6632B 9100-5501 1 Main Transformer T1 6633B 9100-5567 1 Main Transformer T1 6634B 9100-5568 1 Main Transformer S1 All 3101-2862 1 Rocker Switch (AC Line) W1 All 06612-80001 1 Cable (A5 to S1) W2 All 06612-80002 1 Cable (S1 to T1) W3 All 06632-80004 1 Cable (T1 to A1J303) W4 All 06612-80008 1 Cable (T1 to A1 J304/J305) W5 All 06612-80003 1 T1 Jumper W6 All 5080-2452 1 Cable (A1 to A2 J206) W7 All 5080-2448 1 Cable (A1 to A2 J207) W10 All 5080-2457 1 Cable (A2 J210 to A6 J610) W11 All 5080-2457 1 Cable (A2 J211 to A3 J111) W15 All 06612-80010 1 Cable (A1 J314 to A4 J615)

All 8120-4383 1 Line Cord, Standard (Option 903) All 8120-1350 1 Line Cord, Option 900 All 8120-1369 1 Line Cord, Option 901 All 8120-1689 1 Line Cord, Option 902 All 8120-0698 1 Line Cord, Option 904 All 8120-2104 1 Line Cord, Option 906 All 8120-2956 1 Line Cord, Option 912 All 8120-4211 1 Line Cord, Option 917 All 8120-4753 1 Line Cord, Option 918

5 - Replaceable Parts

Table 5-2. Chassis, Mechanical

Designator Model Part Number Qty Description

MP1 All 06612-00002 1 Chassis MP2 All 5063-3426 1 Front Panel Assy, Std unit MP2 All 5063-3443 1 Front Panel Assy, Option 020 MP3 All 0370-3238 1 Knob, 6mm MP4 All 06612-40001 1 Keypad MP5 All 1510-0091 2 Binding Post, Single, Red MP6 66332A 66332-80001 1 Nameplate (66332A) MP6 6632B 06632-80019 1 Nameplate (6632B) MP6 6633B 06633-80002 1 Nameplate (6633B) MP6 6634B 06634-80002 1 Nameplate (6634B) MP7 All 5001-9847 1 Top Cover MP8 All 5041-8819 1 Strap Handle Cap, front MP9 All 5041-8820 1 Strap Handle Cap, rear MP10 All 5062-3702 1 Strap Handle MP11 All 06624-20007 1 Barrier Block Cover MP12 All 1252-1488 1 Terminal Block, 4 Position, RI/DFI MP13 All 06611-40006 1 Fan Spacer (G10) MP14 All 5020-2859 1 Main Heat Sink MP15 All 06612-20002 1 Thermal Insulator MP16 All 0515-0433 15 Screw M4x0.7x8mm, Torx T15, Pan, Conical washer MP17 All 1400-1826 8 Spring Clip MP18 All 06612-20001 4 Insulator MP19 All 06612-80004 1 Rear Label MP20 All 5041-8801 4 Foot MP21 All 0515-1117 2 Screw M5x0.8x10mm, Pozi, Flat, Patch Lock MP22 All 0515-1132 2 Screw M5x0.8x10mm Pozi, Pan, Patch Lock MP23 All 06612-00005 1 Relay Option Bracket MP24 All 06612-00004 1 Binding Post Plate MP25 All 2950-0144 2 Nut, Hex 3/8-32 Nylon MP26 All 0590-0305 2 Nut, Hex w/Lockwasher 6-32 MP27 All 5001-0538 2 Side Trim MP28 All 0380-0644 2 Stud Mounted Standoff MP29 All 2190-0034 2 Washer, Helical Lock #10 MP30 All 3050-0849 2 Washer, Flat #10 MP31 All 5001-6788 1 Transformer Bracket MP32 All 5001-6787 1 Transformer Shim MP33 All 1400-1281 2 Cable Clip MP34 All 0515-0380 10 Screw M4x0.7x10mm, Torx T15, Pan, conical washer MP35 All 0515-1946 1 Screw M3x0.5x6mm, Torx T10, Flat, Patch Lock MP36 All 0515-2535 4 Screw, M3x0.5x8mm, Torx T10, Thread Rolling MP37 All 0515-0374 6 Screw M3x0.5x10mm, Torx T10, Pan, conical washer MP38 All 0535-0031 2 Nut, Hex w/lockwasher, M3x0.5 MP39 All 0460-2362 1 Foam Pad MP40 All 0380-2086 2 Standoff, snap-in MP41 All 8160-0916 2 RFI Clip MP42 All 1252-3056 2 Screw Lock Kit (ref RS232 Connector)

All 5962-0872 1 Operating Guide All 5962-8108 1 Programming Guide

Replaceable Parts - 5

Figure 5-1. Mechanical Parts ldentification

5 - Replaceable Parts

Table 5-3. A1 Control Board PC Board Assembly

Designator Model Part Number Qty Description

A1 66332A/6632B 5063-3431 1 Control PCA, Tested A1 6633B 06633-61023 1 Control PCA, Tested A1 6634B 06634-61023 1 Control PCA, Tested C300 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C301 All 0160-5422 1 Cap 0.047 uF 20% C303 66332A/6632B 0180-4756 1 Cap 18,000 uF 50V C303 6633B 0180-4815 1 Cap 2200 uF 160V C303 6634B 0180-4816 1 Cap 1200 uF 250V C304 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C305 All 0180-2980 1 Cap 1000 uF 50V C306 All 0180-4033 1 Cap 2200 uF 35 V C307 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C308, 309 All 0160-5422 2 Cap 0.047 uF 20% C310 All 0180-4818 1 Cap 8200 uF 16V C311, 312 All 0160-5422 2 Cap 0.047 uF 20% C313 66332A/6632B 0180-4819 1 Cap 33,000 uF 25V C313 6633B 0180-4817 1 Cap 18,000 uF 16V C313 6634B 0180-4818 1 Cap 8200 uF 16V C314 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C315, 316 66332A/6632B 0160-5422 2 Cap 0.047 uF 20% C317 All 0160-5422 1 Cap 0.047 uF 20% C318, 319 All 0180-4129 2 Cap 1 uF 35V C320 All 0180-4136 1 Cap 10 uF 20V C321 All 0180-4129 1 Cap 1 uF 35V C322 All 0160-5422 1 Cap 0.047 uF 20% C323 All 0160-4831 1 Cap 4700 pF 10% C324 All 0180-4129 1 Cap 1 uF 35V C325 - 327 All 0160-5422 3 Cap 0.047 uF 20% C328 All 0160-5098 1 Cap 0.22 uF 10% C330 All 0160-4832 1 Cap 0.01 uF 10% C331, 332 66332A/6632B 0160-4830 2 Cap 2200 pF 10% C333 66332A/6632B 0160-5644 1 Cap 0.033 uF 10% C334 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C334 6633B/6634B 0160-4835 1 Cap 0.1 uF 10% 50V C335 66332A/6632B 0160-7001 1 Cap 3300 pF 100V C335 6633B 0160-5410 1 Cap 3300 pF C335 6634B 0160-4834 1 Cap 0.047 uF 10% C336 All 0160-4812 1 Cap 220 pF 5% C337 - 339 All 0160-5422 3 Cap 0.047 uF 20% C340 6634B 0160-6836 1 Cap 0.01 uF 250V C341 - 343 All 0160-5422 3 Cap 0.047 uF 20% C344 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C344 6633B/6634B 0160-4833 1 Cap 0.022 uF C345 All Not loaded C346 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C346 6633B/6634B 0160-4833 1 Cap 0.022 uF C347 All 0160-6827 1 Cap 0.022 uF 400V C348 All 0160-5422 1 Cap 0.047 uF 20%

Replaceable Parts - 5

Designator Model Part Number Qty Description

C349 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V C349 6633B/6634B 0160-4807 1 Cap 0.033 uF C350 All 0160-5422 1 Cap 0.047 uF 20% C351 All 0160-4791 1 Cap 10 pF 5% 100V C352 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V C352 6633B/6634B 0160-4807 1 Cap 0.033 uF C353, 354 All 0160-5422 2 Cap 0.047 uF 20% C355 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C355 6633B/6634B 0160-4835 1 Cap 0.1 uF 10% 50V C356 All Not loaded C357 All 0160-4801 1 Cap 100 pF 5% C358 All 0160-4791 1 Cap 10 pF 5% 100V C359 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V C359 6633B/6634B 0160-4787 1 Cap 22 pF 5% 100V C360 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V C360 6633B 0160-4789 1 Cap 15 pF 5% 100V C360 6634B 0160-4791 1 Cap 10 pF 5% 100V C361 66332A/6632B 0160-4807 1 Cap 33 pF 5% 100V C362 66332A/6632B 0160-4813 1 Cap 180 pF 5% C362 6633B 0160-4812 1 Cap 220 pF 5% 100V C362 6634B 0160-4800 1 Cap 120 pF 5% C363 All 0160-4807 1 Cap 33 pF 5% 100V C364 All 0160-5422 1 Cap 0.047 uF 20% C365 All 0160-5471 1 Cap 0.1 uF 5% 50V C366, 367 All 0160-4791 2 Cap 10 pF 5% 100V C368 All 0160-4789 1 Cap 15 pF 5% 100V C369 All 0160-6827 1 Cap 0.022 uF 400V C370 All 0160-5422 1 Cap 0.047 uF 20% C371 All 0160-4812 1 Cap 220 pF 5% C372, 373 66332A/6632B 0160-5422 2 Cap 0.047 uF 20% C374 All 0160-5422 1 Cap 0.047 uF 20% C375 66332A/6632B/6633B 0160-5410 1 Cap 3300 pF 5% C375 6634B 0160-5422 1 Cap 0.047 uF 20% C376 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C376 6633B 0160-4918 1 Cap 0.022 uF 20% C376 6634B 0160-6616 1 Cap 6800 pF 20% C377 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C377 6633B 0160-4918 1 Cap 0.022 uF 20% C377 6634B 0160-6616 1 Cap 6800 pF 20% C378 66332A/6632B 0160-5422 1 Cap 0.047 uF 20% C379 All 0160-8153 1 Cap 4700 pF C380 All 0180-4129 1 Cap 1 uF 35V C381 All 0160-8153 1 Cap 4700 pF C382 66332A/6632B 0160-8231 1 Cap-MET 100 uF C382 6633B 0160-8299 1 Cap 50 uF 70V C382 6634B 0160-8230 1 Cap 22 uF 150V C383 66332A/6632B 0160-5469 1 Cap 1 uF 10% 50V C384 All 0160-4789 1 Cap 15 pF 5% 100V C386 All 0160-4787 1 Cap 22 pF 5% 100V

5 - Replaceable Parts

Designator Model Part Number Qty Description

C403 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V C405 All 0160-3454 1 Cap 220 pF 1KV C411 6633B/6634B 0160-7277 1 Cap 2.2 uF C420 6633B/6634B 0160-6800 1 Cap 0.022 uF 20% C421 6633B/6634B 0160-6800 1 Cap 0.022 uF 20% C422 6633B 0160-6180 1 Cap 1000 pF 20% C422 6634B 0160-7336 1 Cap 220 pF 20% C423 6633B 0160-6804 1 Cap 0.047 uF 20% C423 6634B 0160-7568 1 Cap 0.0047 uF 10% C424 6633B 0160-6180 1 Cap 1000 pF 20% C424 6634B 0160-7336 1 Cap 220 pF 20% C425 6633B/6634B 0160-4822 1 Cap 1000 pF C426 6634B 0160-6806 1 Cap 0.1 uF C427 6634B 0160-0157 1 Cap 4700 pF C428 - 430 6633B/6634B 0160-6803 3 Cap 0.047 uF 250v 20% C431, 432 6633B 0160-5847 2 Cap 0.22 uF C480, 481 All 0160-5422 2 Cap 0.047 uF 20% C482 6633B/6634B 0160-6800 1 Cap 0.022 uF 20% C496, 497 All 0180-4129 2 Cap 1 uF 35V C498 All 0160-4801 1 Cap 100 pF 5% C499 66332A/6632B 0160-7562 1 Cap 6.8 uF 63 V CR342 66332A/6632B 5060-3234 1 SCR/Rectifier Assembly (CR342/D330)

1205-0571 1 ref CR342 Heat Sink 1884-0310 1 ref CR342 SCR MCR69-3 1901-0987 1 ref CR342 Power Diode D330

CR342 6633B 5060-3234 1 SCR/Rectifier Assembly (CR342/D330)

1205-0571 1 ref CR342 Heat Sink 1884-0310 1 ref CR342 SCR MCR69-3 1901-0987 1 ref CR342 Power Diode D330

CR342 6634B 5060-3251 1 SCR/Heatsink Assembly

1884-0316 1 ref CR342 SCR 2N6402

1205-0571 1 ref CR342 Heat Sink D300 - 303 All 1901-0731 4 Diode D304 All 1901-1098 1 Diode D305, 306 All 1901-0731 2 Diode D307 All 1901-1098 1 Diode D308 66332A/6632B 5060-3378 1 Rectifier Assembly

1901-1383 1 ref D308 Power Diode

1205-0282 1 ref D308 Heat Sink D308 6633B/6634B 1901-1130 1 Diode D309 66332A/6632B 5060-3228 1 Rectifier Assembly

1901-0987 1 ref D309 Rectifier

1205-0282 1 ref D309 Heat Sink D309 6633B/6634B 1901-1130 1 Diode D310 66332A/6632B 5060-3228 1 Rectifier Assembly

1901-0987 1 ref D310 Rectifier

1205-0282 1 ref D310 Heat Sink

Replaceable Parts - 5

Designator Model Part Number Qty Description

D310 6633B/6634B 1901-1130 1 Diode D311 66332A/6632B 5060-3378 2 Rectifier Assembly

1205-0282 1 ref D311 Heat Sink

1901-1383 1 ref D311 Power Diode D311 6633B/6634B 1901-1130 1 Diode D312 All 1901-1098 1 Diode D313, 314 All 1901-0731 2 Diode D315 All 1901-0050 1 Diode D316 All 1901-0719 1 Power Diode D317 66332A/6632B 1901-1080 1 Diode D317 6633B/6634B 1901-1098 1 Diode D318 66332A/6632B 1901-1080 1 Diode D318 6633B/6634B 1901-1098 1 Diode D319 - 321 6633B/6634B 1901-1098 3 Diode D322 All 1901-0050 1 Diode D323, 324 All 1901-0033 2 Diode D325 All 1901-0050 1 Diode D326 All 1901-0033 1 Diode D327, 328 All 1901-0050 2 Diode D329 All 1901-0033 1 Diode D330 66332A/6632B/6633B 1901-0987 1 Power Diode (See CR342) D335 66332A/6632B 1902-0953 1 Zener Diode 6.2V 5% D336, 337 All 1901-0880 2 Diode D400 6634B 1901-0719 1 Diode, Power D470, 471 All 1902-0960 2 Zener Diode 12V 5% D499 66332A/6632B/6633B 1901-0987 1 Power Diode (See Q314) F300, 301 All 2110-0712 2 Fuse, Submin 4AM, 125V F302 66332A/6632B/6633B 2110-0697 1 Fuse, Submin 15AM, 32V F302 6634B 2110-0685 1 Fuse, Submin 7AM, 125V F303 66332A/6632B/6633B 2110-0697 1 Fuse, Submin 15AM, 32V F303 6634B 2110-0685 1 Fuse, Submin 7AM, 125V F304 All 2110-0699 1 Fuse, Submin 5AM, 125V F305 66332A/6632B/6633B 2110-0777 1 Fuse 8AM 32V F305 6634B 0811-3776 1 Res Fusible 0.5 Ohm 5W

All 2110-1107 2 ref F305 Fuseholder Clips F400, 406 66332A/6632B Not Used 2 Replaced by track on all models F401-405, 407 All Not Used 6 Replaced by track on all models J303 All 1252-0063 1 Connector J304 All 1251-6832 1 Connector J305 All 1252-0063 1 Connector J307 All 1252-5977 1 Connector J309 All 0360-2609 1 Barrier Block J314 All 1252-0056 1 Connector J414 All 1252-0063 1 Connector J508 All 1252-3771 1 AC Line Module L300, 301 66332A/6632B 9140-0115 2 Coil 22 uH 10%

5 - Replaceable Parts

Designator Model Part Number Qty Description

Q300 All 5060-3245 1 Darlington Fan Driver Assembly

All 1854-0828 1 ref Q300 Transistor,NPN SI

All 1205-0282 1 ref Q300 Heat Sink Q301 66332A/6632B/6633B 1854-0474 1 Transistor, NPN Q301 6634B 1854-0575 1 Transistor, NPN Q302 66332A/6632B/6633B 1854-0474 1 Transistor, NPN Q302 6634B 1854-0575 1 Transistor, NPN Q303 66332A/6632B 06612-60008 1 Transistor Driver Assembly

1854-0872 1 ref Q303 Transistor, NPN 1205-0350 1 ref Q303 Heat Sink

Q303 6633B 06633-60009 1 Assembly, Transistor/Heat Sink

1854-0920 1 ref Q303 Transistor, NPN 1205-0571 1 ref Q303 Heat Sink

Q303 6634B 06634-60009 1 Transistor/HS Assembly

1205-0571 1 ref Q303 Heat Sink 1854-0838 1 ref Q303 Transistor, NPN

Q304 66332A/6632B 06612-60009 1 Transistor Driver Assembly

1205-0350 1 ref Q304 Heat Sink 1853-0497 1 ref Q304 Transistor, PNP

Q304 6633B 5063-3451 1 Assembly, Transistor/Heat Sink

1853-0652 1 ref Q304 Transistor PNP Q304 1205-0571 1 ref Q304 Heat Sink

Q304 6634B 5063-3451 1 Transistor/HS Assembly

1853-0652 1 ref Q304 Transistor PNP Q304

1205-0571 1 ref Q304 Heat Sink Q305 All 1858-0054 1 Transistor Array Q306 All 1853-0336 1 Transistor, PNP Q307 All 1853-0086 1 Transistor, PNP Q308 66332A/6632B 1854-1174 1 Transistor, NPN Q308 6633B/6634B 1854-1362 1 Transistor, NPN Q309 66332A/6632B 1854-1174 1 Transistor, NPN Q309 6633B/6634B 1854-1362 1 Transistor, NPN Q310 66332A/6632B 1853-0656 1 Transistor, PNP Q310 6633B/6634B 1853-0772 1 Transistor, PNP Q311 66332A/6632B 1853-0656 1 Transistor, PNP Q311 6633B/6634B 1853-0772 1 Transistor, PNP Q312 66332A/6632B 1854-1174 1 Transistor, NPN Q313 All 06612-60006 1 FET Assembly

All 1855-0831 1 ref Q313 MOSFET N-Chan All 1205-0350 1 ref Q313 Heat Sink

Q314 All 06612-60005 1 FET/Diode Assembly

All 0590-0199 1 ref Q314 Hex Nut w/ Lockwasher All 1855-0726 1 ref Q314 MOSFET P-Chan All 1205-0350 1 ref Q314 Heat Sink All 0340-0950 1 ref Q314 Insulator All 2200-0143 1 ref Q314 Mach Screw 4-40 All 1901-0987 1 ref Q314 Diode (D499)

Replaceable Parts - 5

Designator Model Part Number Qty Description

Q315 66332A/6632B 1854-1174 1 Transistor, NPN Q315 6633B/6634B 1854-1362 1 Transistor, NPN Q316 All 1855-1016 1 Transistor, FET Q317 66332A/6632B 1853-0656 1 Transistor, PNP Q317 6633B/6634B 1853-0772 1 Transistor, PNP Q318 All 1858-0074 1 Transistor Array Q319 66332A/6632B 1853-0656 1 Transistor, PNP R300 66332A/6632B/6633B 0698-3642 1 Res 3K 5% 2W MO R300 6634B 0764-0046 1 Res 33K 5% 2W MO R301 66332A/6632B 0757-0403 1 Res 121 Ohm 1% 0.125W R301 6633B 0757-0416 1 Res 511 1% 0.125W R301 6634B 0757-0283 1 Res 2k 1% 0.125W R302 66332A/6632B 0757-0403 1 Res 121 Ohm 1% 0.125W R302 6633B 0757-0416 1 Res 511 1% 0.125W R302 6634B 0757-0283 1 Res 2k 1% 0.125W R303 All 0757-0280 1 Res 1K 1% 0.125W R304 All 0698-3279 1 Res 4.99K 1% R305 All 0698-4202 1 Res 8.87K 1% R306 All 0757-0280 1 Res 1K 1% 0.125W R307 - 309 All 0757-0442 3 Res 10K 1% 0.125W R310 All 0698-3156 1 Res 14.7K 1% R311 All 0686-2225 1 Res 2.2K 5% 0.5W R312 All 0698-0092 1 Res 2.61K 1% R313 66332A/6632B 0683-0475 1 Res 4.7 Ohm 5% 0.25W R313 6633B/6634B 0757-0346 1 Res 10 1% R314 All 0757-0442 1 Res 10K 1% 0.125W R315 All 8159-0005 1 Jumper R316 All 0757-0401 1 Res 100 Ohm 1% 0.125W R317, 318 All 8159-0005 2 Jumper R319 66332A/6632B 0698-3444 1 Res 316 Ohm 1% 0.125W R319 6633B 0757-0416 1 Res 511 1% R319 6634B 0757-0420 1 Res 750 1% R320 66332A/6632B 0757-0427 1 Res 1.5K 1% 0.125W R320 6633B 0698-0085 1 Res 2.61k 1% R320 6634B 0757-0280 1 Res 1k 1% R321 66332A/6632B 0698-4509 1 Res 80.6K 1% R321 6633B 0698-3454 1 Res 215k 1% R321 6634B 0698-4536 1 Res 340k 1% R322 All 0757-0280 1 Res 1K 1% 0.125W R323 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W R323 6633B 0757-0438 1 Res 5.11K 1% R323 6634B 0698-3156 1 Res 14.7K 1% R324 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W R324 6633B/6634B 0757-0438 1 Res 5.11K 1% R325 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W R325 6633B 0698-3156 1 Res 14.7K 1% R325 6634B 0757-0438 1 Res 5.11K 1%

5 - Replaceable Parts

Designator Model Part Number Qty Description

R326 66332A/6632B 0757-0200 1 Res 5.62K 1% R326 6633B/6634B 0698-3159 1 Res 26.1K 1% R327 All 0757-0280 1 Res 1K 1% 0.125W R328 66332A/6632B 0683-0475 1 Res 20K 1% 0.125W R328 6633B/6634B 0757-0346 1 Res 10 1% R329 66332A/6632B 0757-0449 1 Res 4.7 Ohm 5% 0.25W R329 6633B 0757-0453 1 Res 30.1K 1% R329 6634B 0757-0458 1 Res 51.1K 1% R330 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W R330 6633B/6634B 0698-3156 1 Res 14.7K 1% R331 All 0757-0280 1 Res 1K 1% 0.125W R332 All 0757-0199 1 Res 21.5K 1% R333 66332A/6632B 0757-0438 1 Res 5.11K 1% R333 6633B/6634B 0757-0441 1 Res 8.25K 1% R334 66332A/6632B 8159-0005 1 Jumper R335 All 0757-0438 1 Res 5.11K 1% R336 All 0757-0280 1 Res 1K 1% 0.125W R337 66332A/6632B/6633B 0698-3444 1 Res 316 Ohm 1% 0.125W R337 6634B 0757-0420 1 Res 750 1% 0.125W R339 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W R339 6633B 0757-0458 1 Res 51.1k 1% 0.125W R339 6634B 0698-3454 1 Res 215K 1% 0.125W R340 66332A/6632B 0757-0407 1 Res 200 Ohm 1% 0.125W R340 6633B 0757-0414 1 Res 432 1% 0.125W R340 6634B 0757-0280 1 Res 1K 1% 0.125W R341 66332A/6632B 0698-3441 1 Res 215 Ohm 1% R341 6633B 0757-0414 1 Res 432 1% 0.125W R341 6634B 0757-0280 1 Res 1K 1% 0.125W R342 66332A/6632B 0698-4509 1 Res 80.6K 1% R342 6633B 0698-3456 1 Res 287K 1% 0.125W R342 6634B 0698-3260 1 Res 464K 1% 0.125W R343 66332A/6632B 0698-3441 1 Res 215 Ohm 1% R343 6633B 0757-0414 1 Res 432 1% 0.125W R343 6634B 0757-0280 1 Res 1K 1% 0.125W R344 All 0757-0442 1 Res 10K 1% 0.125W R345 All 0757-0280 1 Res 1K 1% 0.125W R346 All 0757-0442 1 Res 10K 1% 0.125W R347 All 0757-0458 1 Res 51.1K 1% R348 66332A/6632B 0698-3444 1 Res 316 Ohm 1% 0.125W R348 6633B 0698-4187 1 Res 632 1% R348 6634B 0757-0427 1 Res 1.5K 1% R349 66332A/6632B 0698-3159 1 Res 26.1K 1% R349 6633B 0698-4509 1 Res 80.6K 1% R349 6634B 0757-0468 1 Res 130K 1% R350 66332A/6632B 0757-0279 1 Res 3.16K 1% R350 6633B 0757-0435 1 Res 3.92K 1% R350 6634B 0757-0279 1 Res 3.16K 1%

Replaceable Parts - 5

Designator Model Part Number Qty Description

R351 66332A/6632B 0698-6320 1 Res 5K 0.1% R351 6633B 0698-5087 1 Res 6.2K 1% R351 6634B 0698-6320 1 Res 5K 1% R352 66332A/6632B 8159-0005 1 Jumper R353 All 0698-8959 1 Res 619K 1% R354 66332A/6632B 0757-0447 1 Res 16.2K 1% R354 6633B 0757-0458 1 Res 51.1K 1% R354 6634B 0698-4509 1 Res 80.6K 1% R355 All 0698-0084 1 Res 2.15K 1% R356 66332A/6632B 0757-0472 1 Res 200K 1% R356 6633B 0757-0270 1 Res 249K 1% R356 6634B 0757-0472 1 Res 200K 1% R357 66332A/6632B 0699-2246 1 Res 25K 0.05% R357 6633B/6634B 0699-1510 1 Res 22.22K 0.05% R358 All Not loaded R359 66332A/6632B 8159-0005 1 Jumper R360, 361 All 0699-2246 2 Res 25K 0.05% R362 66332A/6632B 0698-8807 1 Res 39K 0.1% R362 6633B/6634B 0699-1513 1 Res 40K 0.05% R363 All 0757-0473 1 Res 221K 1% R364 66332A/6632B 0699-2246 1 Res 25K 0.05% R364 6633B/6634B 0699-1510 1 Res 22.22K 0.05% R365, 366 All 0698-6392 2 Res 22K 0.1% 0.125W R367 All 0757-0436 1 Res 4.32K 1% R370 All 0757-0442 1 Res 10K 1% 0.125W R371 66332A/6632B 0699-0934 1 Res 35.65K 0.1% R371 6633B/6634B 0699-2246 1 Res 25K 0.05% R372 66332A/6632B 0699-0236 1 Res 2.5K 0.1% 0.1W R372 6633B/6634B 0699-1867 1 Res 3.2K 0.1% 0.1W R373 66332A/6632B 0757-0401 1 Res 100 Ohm 1% 0.125W R374 All 0757-0458 1 Res 51.1K 1% R375 All Not loaded R376 66332A/6632B 0699-0934 1 Res 35.65K 0.1% R376 6633B/6634B 0699-2246 1 Res 25K 0.05% R377 66332A/6632B 0698-8807 1 Res 39K 0.1% R377 6633B/6634B 0699-1513 1 Res 40K 0.05% R378 66332A/6632B 0698-3634 1 Res 470 Ohm 5% 2W R378 6633B/6634B 0698-3642 1 Res 3K 5% 2W MO R379 All 0757-0436 1 Res 4.32K 1% R380 All 0757-0401 1 Res 100 Ohm 1% 0.125W R381 All 0698-8959 1 Res 619K 1% 0.125W R382 All 0757-0401 1 Res 100 Ohm 1% 0.125W R383 All 0698-3460 1 Res 422K 1% R384 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R384 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R385 66332A/6632B 0699-0236 1 Res 2.5K 0.1% 0.1W R385 6633B/6634B 0699-1867 1 Res 3.2K 1% 0.125W

5 - Replaceable Parts

Designator Model Part Number Qty Description

R386 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R386 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R387 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R387 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R388 All 0757-0442 1 Res 10K 1% 0.125W R389 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R389 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R390, 391 All 0698-8834 2 Res 9K 0.1% 0.125W R392 66332A/6632B 0698-6320 1 Res 5K 0.1% R392 6633B/6634B 0698-6348 1 Res 3K 0.1% 0.125W R393 66332A/6632B/6633B 0698-6360 1 Res 10K 0.1% R393 6634B 0698-8865 1 Res 4.45K 0.1% 0.1W R394 66332A/6632B 0698-6358 1 Res 100K 0.1% R394 6633B 0698-6376 1 Res 200K 0.1% 0.1W R394 6634B 0698-7841 1 Res 164K 0.1% 0.1W R395, 396 All 0699-1866 2 Res 2.7K 0.1% R397 6634B 0698-3642 1 Res 3K 2W R398 All 0757-0442 1 Res 10K 1% 0.125W R399 All 0698-6533 1 Res 12.5K 0.1% R400, 401 All 0757-0442 2 Res 10K 1% 0.125W R402 All 0757-0438 1 Res 5.11K 1% R403 All 0699-4484 1 Res 72 Ohm R404 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W R405 All 0698-8827 1 Res 1M 1% 0.125W R406 All 0698-3456 1 Res 287K 1% R407 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R407 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R408 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R408 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R409 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R409 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R410 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R410 6633B 0811-2553 1 Res 7.5 5% 2W PW R411 66332A/6632B/6633B 8159-0005 1 Jumper R412 66332A/6632B/6633B 0698-3454 1 Res 215K 1% R412 6634B 0698-3459 1 Res 383K 1% R413 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W R414 All 0699-0088 1 Res 1.2M 1% R415 66332A/6632B 0698-6392 1 Res 22K 0.1% 0.125W R415 6633B/6634B 0699-1510 1 Res 22.22K 0.1%.125W R416 All 0686-7515 1 Res 750 Ohm 5% 0.5W R417 All 0757-0442 1 Res 10K 1% 0.125W R418 66332A/6632B 0757-0458 1 Res 51.1K 1% R418 6633B 0698-3201 1 Res 80K 1% R418 6634B 0698-5092 1 Res 160K 1% R419 All 0757-0442 1 Res 10K 1% 0.125W R420 All 0699-1972 1 Res 1.74M 0.1% 0.125W

Replaceable Parts - 5

Designator Model Part Number Qty Description

R421 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R421 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R422 66332A/6632B 0698-6351 1 Res 133K 0.1% R423 66332A/6632B/6633B 0699-0267 1 Res 10K 0.05% R423 6634B 0699-0278 1 Res 15K 0.05% 0.1W R425 66332A/6632B 0698-4539 1 Res 402K 1% R427 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W R427 6633B/6634B 8159-0005 1 Jumper R428 6634B 0698-3642 1 Res 3K R429 66332A/6632B/6633B 0699-0267 1 Res 10K 0.05% R429 6634B 0699-0278 1 Res 15K 0.05% 0.1W R430 66332A/6632B 0757-0272 1 Res 52.3K 1% R431 All 0757-0438 1 Res 5.11K 1% R432 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W R432 6633B 0698-0084 1 Res 2.15K 1% R432 6634B 0757-0438 1 Res 5.11K 1% R433 66332A/6632B 0698-4099 1 Res 139 Ohm 1% 0.125W R434 66332A/6632B 8159-0005 1 Jumper R435 All 8159-0005 1 Jumper R436, 437 66332A/6632B 0811-1672 2 Res 3.3 Ohm 5% 2W R438 All 8159-0005 1 Jumper R439 66332A/6632B 0698-6317 1 Res 500 Ohm 0.1% R440 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R440 6633B/6634B 0811-2553 1 Res 7.5 5% 2W PW R441 All 0698-4486 1 Res 24.9K 1% R442 66332A/6632B 0699-1513 1 Res 40K 0.05% R442 6633B 0699-3416 1 Res 100K 0.05% 0.1W R442 6634B 0699-3448 1 Res 300K 0.05% 0.1W R443 66332A/6632B 0699-1513 1 Res 40K 0.05% R443 6633B 0699-3416 1 Res 100K 0.05% 0.1W R443 6634B 0699-3448 1 Res 300K 0.05% 0.1W R444 All 0757-0438 1 Res 5.11K 1% R445 66332A/6632B 0811-0929 1 Res 0.51 Ohm 5% 2W R445 6633B 0812-0019 1 Res 0.33 5% 2W PW R445 6634B 0811-1220 1 Res 1.5 5% 2W PW R446 66332A/6632B 0698-6631 1 Res 2.5K 0.1% R446 6633B 0698-8863 1 Res 5.2K 0.1% R446 6634B 0699-0489 1 Res 16.1K 0.1% R447 66332A/6632B 0698-4123 1 Res 499 Ohm 1% 0.125W R448 All 8159-0005 1 Jumper R449 66332A/6632B 8159-0005 1 Jumper R450 66332A/6632B 0698-8812 1 Res 1 Ohm 1% 0.125W R451 All 8159-0005 1 Jumper R452 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W R452 6633B 0698-0084 1 Res 2.15K 1% R452 6634B 0757-0438 1 Res 5.11K 1% R453 66332A/6632B 0698-6360 1 Res 10K 0.1% R454 All 8159-0005 1 Jumper

5 - Replaceable Parts

Designator Model Part Number Qty Description

R455 66332A/6632B 0698-6631 1 Res 2.5K 0.1% R455 6633B 0698-8863 1 Res 5.2K 0.1% R455 6634B 0699-0489 1 Res 16.1K 0.1% R456 All 8159-0005 1 Jumper R457 66332A/6632B 8159-0005 1 Jumper R458 All 8159-0005 1 Jumper R459 66332A/6632B 8159-0005 1 Jumper R460 All 0698-6620 1 Res 150K 0.1% R461 All 0757-0395 1 Res 56.2 Ohm 1% R462 66332A/6632B/6633B 0757-0416 1 Res 511 Ohm 1% 0.125W R462 6634B 0757-0394 1 Res 51.1 Ohm 1% 0.125W R463 6634B 0698-3642 1 Res 3K 2W R464, 465 All 0698-0084 2 Res 2.15K 1% R466 66332A/6632B 0698-8812 1 Res 1 Ohm 1% 0.125W R466 6633B 0683-0475 1 Res 4.7 Ohm R466 6634B 0757-0379 1 Res 12.1 Ohm R467, 468 66332A/6632B 0811-1672 2 Res 3.3 Ohm 5% 2W R469 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R469 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R470 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W R470 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW R471 66332A/6632B 0699-1797 1 Res 10M 5% 0.25W R471 6633B/6634B 0683-1065 1 Res 10M R472 All 0757-0442 1 Res 10K 1% 0.125W R473 66332A/6632B 0811-3770 1 Res 0.05 Ohm 1% R473 6633B 0811-3771 1 Res 0.25 Ohm 1% R473 6634B 0811-3772 1 Res 0.5 Ohm 1% R474 All 8159-0005 1 Jumper R476 All 0757-0281 1 Res 2.74K 1% R477 All 0757-0199 1 Res 21.5K 1% R478, 479 All 0698-4444 2 Res 4.87K 1% R480, 481 All 0757-0269 2 Res 270 Ohm 1% 0.125W R482 All 0698-3226 1 Res 6.49K 1% R483 All 0698-5089 1 Res 33K 1% 0.125W R488 66332A/6632B 0698-3922 1 Res 487K 0.1% R488 6633B 0699-1744 1 Res 280K 0.1% R488 6634B 0699-0070 1 Res 3.16M 1% R489 66332A/6632B 0698-3922 1 Res 487K 0.1% R489 6633B 0698-6950 1 Res 1.25M 0.1% 0.5W R489 6634B 0699-0070 1 Res 3.16M 1% R490 66332A/6632B 0699-0730 1 Res 1M 0.1% R490 6633B 0699-0070 1 Res 3.16M 1% R490 6634B 0683-6855 1 Res 6.8M 5% R493 All 0757-0438 1 Res 5.11K 1% R494, 495 All 0698-8812 2 Res 1 Ohm 1% 0.125W R496 66332A/6632B 0757-0289 1 Res 13.3K 1% R496 6633B/6634B 0757-0433 1 Res 3.32K 0.125W

Replaceable Parts - 5

Designator Model Part Number Qty Description

R497 66332A/6632B 0757-0289 1 Res 13.3K 1% R497 6633B/6634B 0757-0433 1 Res 3.32K 0.125W R498 - 500 All 0757-0407 2 Res 200 Ohm 1% 0.125W R505 6633B Not Used 1 R510 - 517 66332A/6632B 0811-1672 8 Res 3.3 Ohm 5% 2W R520 6633B/6634B Not Used 1 R521 All Not Used 1 Replaced by wire in 6633B/6634B units R522 All Not Used 1 RT301 All 0837-0397 1 Thermistor S300 All 3101-2927 1 Switch, Right Angle Slide T300 66332A/6632B 9100-4350 1 Current Transformer T300 6633B/6634B 8159-0005 1 Jumper U300 All 5060-3229 1 -15V Regulator Assembly

All 1826-0214 1 ref U300 Integrated Circuit All 1205-0282 1 ref U300 Heat Sink

U301 All 5063-2389 1 +5V Regulator Assembly (Interface Bias)

All 1826-1597 1 ref U301 Integrated Circuit All 1205-0402 1 ref U301 Heat Sink

U302 All 5060-2948 1 +5V Regulator Assembly (Secondary Bias)

All 1205-0282 1 ref U302 Heat Sink

All 1826-0122 1 ref U302 Integrated Circuit U303 All 1826-1533 1 Integrated Circuit U304 All 5060-3232 1 +15V Regulator Assembly

All 1826-0106 1 ref U304 Integrated Circuit

All 1205-0282 1 ref U304 Heat Sink U305 All 1826-0346 1 Integrated Circuit U306 All 1826-1370 1 Integrated Circuit U308 All 1826-1534 1 Integrated Circuit U309 All 1826-3521 1 Integrated Circuit U310 All 1826-2252 1 Integrated Circuit U311 All 1826-3521 1 Integrated Circuit U313 All 1826-1878 1 Integrated Circuit U314 66332A/6632B 1826-3521 1 Integrated Circuit U315 All 1826-1878 1 Integrated Circuit U400 All 1826-0643 1 Integrated Circuit VR300 All 1902-0955 1 Integrated Circuit VR301 All 1902-0957 1 Zener Diode 9.1V 5% VR302 6634B 1902-3092 1 Zener Diode 4.99V 5% VR303 66332A/6632B 1902-0953 1 Zener Diode 6.2V 5% VR303 6633B/6634B 1902-0958 1 Zener Diode 10V 5% VR304 66332A/6632B 1902-0943 1 Zener Diode 2.4V 5% VR304 6633B/6634B 1902-0947 1 Zener Diode 3.6V 5% VR305 66332A/6632B 1902-0943 1 Zener Diode 2.4V 5% VR305 6633B/6634B 1902-0947 1 Zener Diode 3.6V 5% VR335 66332A/6632B 1902-0953 1 Zener Diode 6.2V 5% VR335 6633B/6634B 1902-0957 1 Zener Diode 9.1V 5% W300, 301 All 8159-0005 2 Jumper

5 - Replaceable Parts

A2 Interface PCA, Tested for 66332A 5063-3439 No user replaceable parts A2 Interface PCA, Tested for 6632B/6633B/6634B 5063-3429 No user replaceable parts A3 Front Panel PCA Tested for all models 5063-3432 No user replaceable parts

Table 5-4. Binding Post Option #020

Designator Model Part Number Qty Description

A4 6633B/6634B 5063-3406 1 Binding Post PCA A4 66332A/6632B 06611-60022 1 Binding Post PCA C603, 604 All 0160-8153 2 Cap 4700 pF J615 All 1252-0056 1 4 Pin Connector MP5 All 1510-0091 2 Binding Post, Single, Red MP26 All 0590-0305 2 Nut, Hex 6-32 w/Lockwasher MP25 All 2950-0144 2 Nut, Hex 3/8-32 Nylon MP24 All 06612-00004 1 Binding Post Plate W15 All 06612-80010 1 Cable (A1 J314 to A4 J615)

Table 5-5. A5 AC input/RFI Board

Designator Model Part Number Qty Description

A5 All 5063-3433 1 AC Input/RFI PCA C500 All 0160-4259 1 Cap 0.22 uF 10% C501, 502 All 0160-8181 2 Cap 0.0022 uF F500 All 2110-0055 1 Fuse 4AM, 250V (100Vac and 120Vac input) F500 All 2110-0002 1 Fuse 2AM, 250V (220Vac and 230Vac input) J508 All 1252-3771 1 AC Line Module XF500 All 2110-0927 1 Fuseholder, with cap

Table 5-6. Relay Option #760

Designator Model Part Number Qty Description

A6 All 5063-3434 1 Relay PCA, Tested C600 All 0160-5422 1 Cap 0.047 uF 20% C601, 602 All 0150-0081 2 Cap 0.01 uF F601, 602 All 2110-0671 2 Fuse 0.125AM, 125V J610 All 1252-7643 1 Connector K601 - 603 All 0490-1405 3 Relay, 2C 12VDC K604, 605 All 0490-1670 2 Power Relay R601, 602 All 0686-2215 2 Res 220 Ohm 5% 0.5W R603 All 0698-3439 1 Res 178 Ohm 1% 0.125W R604 All 0757-0284 1 Res 150 Ohm 1% 0.125W R605 All 0698-3439 1 Res 178 Ohm 1% 0.125W R606 All 0757-0284 1 Res 150 Ohm 1% 0.125W R607 All 0698-3439 1 Res 178 Ohm 1% 0.125W U601 All 1858-0047 1 Transistor Array W10 All 5080-2457 1 Cable (A2 J210 to A6 J610)

Diagrams

Introduction

This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent Model 66332A Dynamic Measurement DC Source and the Agilent Model 66332A/6632B/6633B/6634B System DC Power Supplies. Unless otherwise specified in the drawings, a drawing or diagram applies to all models and input voltage options.

General Schematic Notes

a Components marked with an asterisk are model dependent (See Table 6-1).

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

a All capacitors are in microfarads 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

Table 6-1. Model-dependent Components

Designator 66332A/

6632B

C300, 304, 307 0.047 uF C411 2.2 uF 2.2 uF C302 18000 uF 2200 uF 1200 uF C420, 421 0.022 uF 0.022 uF C313 33,000 uF 18000 uF 8200 uF C422, 424, 425 1000 pF 220 pF C314-316 0.047 uF C423 0.047 uF 0.0047 uF C331, 332 2200 pF C425 1000 pF 1000 pF C333 0.033 uF C426 0.1 uF C335 3300 pF 3300 pF 0.047 pF C427 4700 pF C340 0.01 uF C428-430 0.047 uF 0.047 uF C344, 346 0.047 uF 0.022 uF 0.022 uF C431, 432 0.22 uF C349, 352 10 pF 0.033 uF 0.033 uF C482 0.022 uF 0.022 uF C359 10 pF 22 pF 22 pF C499 6.8 uF C360 10 pF 15 pF 10 pF D319, 320, 321 Diode Diode C361 33 pF D330 Diode Diode C362 180 pF 220 pF 120 pF D400 Diode C372, 373 0.047 uF D499 Diode Diode C375 0.047 uF F400, 406 0 Ohm C376, 377 0.047 uF 0.022 uF 6800 pF L300, 301 22 uH C378 0.047 uF Q312, 319 Transistor C382 100 uF 50 uF 22 uF R300 3K 12K 33K C383 1 uF R301, 302 121 Ohm 511 Ohm 2k C403 10 pF R313 4.7 Ohm 10 Ohm 10 Ohm

6633B 6634B Designator 66332A/

6632B

6633B 6634B

6 - Diagrams

Table 6-1. Model-dependent Components (continued)

Designator 66332A/

6632B

R319 316 Ohm 511 Ohm 750 Ohm R413 10K R320 1.5K 2.61k 1k R415 22K 22.22K 22.22K R321 80.6K 215k 340k R418 51.1K 80K 160K R323 1K 5.11K 14.7K R421 3.3 Ohm 7.5 Ohm R324 1K 5.11K 5.11K R422 133K R325 1K 14.7K 5.11K R423, 429 10K 10K 15K R326 5.62K 26.1K 26.1K R425 402K R328 20K 10 Ohm 10 Ohm R427 10K 0 Ohm 0 Ohm R329 4.7 Ohm 30.1K 51.1K R428 3K R330 1K 14.7K 14.7K R430 52.3K R333 5.11K 8.25K 8.25K R432 1K 2.15K 5.11K R334 0 Ohm R433 139 Ohm R337 316 Ohm 316 Ohm 750 Ohm R434 0 Ohms R339 10K 51.1k 215K R436, 437 0 Ohms R340 200 Ohm 432 Ohm 1K R439 500 Ohm R341, 343 215 Ohm 432 Ohm 1K R440 3.3 Ohm 7.5 Ohm 7.5 Ohm R342 80.6K 287K 464K R442, 443 40K 100K 300K R348 316 Ohm 632 Ohm 1.5K R445 0.51 Ohm 0.33 1.5 R349 26.1K 80.6K 130K R446 2.5K 5.2K 16.1K R350 3.16K 3.92K 3.16K R447 499 Ohm R351 5K 6.2K 5K R449 0 Ohm R352 0 Ohm R450 1 Ohm R354 16.2K 51.1K 80.6K R452 1K 2.15K 5.11K R356 200K 249K 200K R453 10K R357 25K 22.22K 22.22K R455 2.5K 5.2K 16.1K R359 0 Ohm R457, 459 0 Ohm R362 39K 40K 40K R462 511 Ohm 511 Ohm 51.1 Ohm R364 25K 22.22K 22.22K R463 3K R371 35.65K 25K 25K R466 1 Ohm 4.7 Ohm 12.1 Ohm R372 2.5K 3.2K 3.2K R467, 468 0 Ohm R373 100 Ohm R469 7.5 Ohm R376 35.65K 25K 25K R470 7.5 Ohm 7.5 Ohm R377 39K 40K 40K R473 0.05 Ohm 0.25 Ohm 0.5 Ohm R378 470 Ohm 3K 3K R488 487K 280K 3.16M R384, 389 3.3 Ohm 7.5 Ohm R489 487K 1.25M 3.16M R385 2.5K 3.2K 3.2K R490 1M 3.16M 6.8M R386, 387 3.3 Ohm 7.5 Ohm 7.5 Ohm R496, 497 13.3K 3.32K 3.32K R392 5K 3K 3K R505 1.25M R393 10K 10K 4.45K R513, 515 0 Ohm R394 100K 200K 164K R520 0 Ohm 0 Ohm R397 3K T300 Xfmr R404 10K U314 IC R407, 410 3.3 Ohm 7.5 Ohm VR302 4.99V R408, 409 3.3 Ohm 7.5 Ohm 7.5 Ohm VR303 6.2V 10V 10V R411 0 Ohm 0 Ohm VR304, 305 2.4V 3.6V 3.6V R412 215K 215K 383K VR335 6.2V 9.1V 9.1V

6633B 6634B Designator 66332A/

6632B

6633B 6634B

Diagrams - 6

Table 6-2. A1 Board Component Locations

Ref. X Y Ref. X Y Ref. X Y Ref. X Y Ref. X Y

C300 8.125 3.25 C371 5.05 7.65 D323 1.025 4.9 R301 5.45 1.0 R366 1.3 3.925 C301 2.075 0.525 C372 1.875 7.9 D324 0.1 4.375 R302 6.275 0.1 R367 0.675 4.225 C302 7.5 1.925 C373 1.875 7.8 D325 0.15 7.125 R303 7.925 2.8 R368 1.125 5.0 C304 6.025 0.45 C374 0.3 8.325 D326 0.775 8.525 R304 5.85 2.1 R370 3.65 5.875 C307 5.45 0.45 C375 3.575 8.4 D327 1.0 8.025 R305 4.85 2.075 R371 2.075 5.8 C308 4.05 3.45 C376 1.2 9.875 D328 1.0 7.825 R306 5.3 1.975 R372 2.375 6.25 C309 8.025 2.8 C377 0.525 9.85 D329 0.425 8.425 R307 0.7 2.7 R373 3.175 9.275 C311 4.775 0.975 C378 1.775 10.42 D330 4.2 8.7 R308 1.15 2.8 R374 0.1 5.325 C312 4.875 1.425 C379 0.525 10.17 D331 5.15 0.8 R309 1.6 3.0 R375 0.675 4.125 C314 3.5 4.925 C380 4.675 6.975 D332 4.575 0.8 R310 1.7 3.5 R376 1.975 5.8 C315 3.825 4.7 C381 0.925 10.4 D333 5.775 0.8 R311 3.45 2.3 R377 0.55 4.475 C316 3.625 3.175 C382 3.0 10.45 D334 6.25 0.8 R312 1.4 1.75 R378 8.025 8.55 C317 1.15 2.5 C383 3.8 10.25 D336 4.65 6.4 R313 4.025 4.25 R379 0.1 4.125 C318 0.95 1.35 C384 0.3 9.35 D337 4.825 6.25 R314 0.6 3.1 R380 1.75 6.25 C319 3.525 1.475 C386 2.45 6.875 D400 3.375 7.7 R315 3.05 2.0 R381 0.55 5.625 C320 4.8 2.25 C403 1.775 8.475 D470 3.3 6.525 R316 4.825 7.025 R382 1.75 5.875 C321 3.975 1.925 C405 0.525 9.975 D471 3.65 6.175 R317 2.85 2.0 R383 1.125 5.425 C322 5.4 2.2 C411 2.825 8.3 D499 3.65 6.825 R318 2.95 2.0 R384 6.8 5.45 C323 5.4 2.0 C420 3.475 4.825 F300 1.875 0.075 R319 2.25 3.5 R385 2.275 6.25 C324 2.45 1.5 C421 3.3 4.825 F301 1.975 0.075 R320 2.15 3.4 R386 7.05 5.45 C326 0.175 2.05 C422 2.175 2.25 F302 4.725 0.425 R321 2.15 2.9 R387 5.7 5.1 C327 1.15 2.0 C423 1.7 3.2 F303 4.825 0.425 R322 1.7 3.6 R388 1.75 4.225 C328 0.475 2.7 C424 1.775 2.75 F304 0.275 2.05 R323 1.6 2.2 R389 5.95 5.1 C329 0.35 2.425 C425 0.525 6.7 F400 7.95 7.375 R324 4.75 4.85 R390 1.875 7.6 C330 1.25 2.9 C426 4.6 10.57 F401 8.05 5.425 R325 3.35 3.225 R391 1.875 7.3 C331 2.3 2.425 C427 2.1 10.47 F402 5.6 7.1 R326 4.65 5.3 R392 0.5 2.1 C332 1.925 2.7 C428 6.25 0.525 F403 5.55 4.8 R327 0.6 3.0 R393 2.225 2.0 C333 1.7 3.3 C429 5.375 0.425 F404 7.75 8.85 R328 3.475 5.025 R394 2.05 2.0 C334 1.125 4.625 C430 8.225 3.35 F405 7.95 6.275 R329 2.25 3.2 R395 2.425 7.4 C335 1.15 7.225 C431 1.75 10.47 F406 5.725 8.85 R330 4.15 3.175 R396 2.325 7.7 C336 1.05 7.65 C432 4.6 10.45 F407 5.65 5.925 R331 1.6 3.1 R397 8.275 8.55 C337 0.1 5.525 C480 3.75 6.2 F500 4.871 3.147 R332 2.25 3.0 R398 4.95 8.875 C338 0.7 7.35 C481 3.75 6.3 J303 0.15 2.75 R333 2.25 3.3 R399 0.875 8.225 C339 1.15 7.45 C482 3.2 3.75 J304 5.8 0.2 R334 4.125 4.25 R400 1.45 8.425 C340 1.5 2.35 C496 2.5 1.85 J305 1.575 0.15 R335 0.6 2.9 R401 1.45 8.225 C341 2.7 4.025 C497 3.05 1.825 J307 0.147 5.878 R336 1.6 3.2 R402 1.4 7.925 C342 1.05 5.875 C498 1.8 3.7 J309 2.075 10.63 R337 3.925 4.25 R403 2.6 8.3 C343 1.75 4.025 C499 2.875 7.95 J314 1.375 10.17 R338 1.7 2.8 R404 2.7 3.825 C344 3.75 6.4 C500 5.725 2.725 J320 2.25 9.55 R339 2.7 2.525 R405 0.425 8.325 C345 0.95 4.75 C501 6.35 3.1 J414 4.7 2.225 R340 2.675 2.1 R406 1.45 8.625 C346 3.65 6.075 C502 5.1 3.1 J508 6.35 3.45 R341 2.7 3.1 R407 5.95 6.9 C347 0.6 3.325 Cr342 3.9 8.9 L300 3.625 4.85 R342 1.7 3.0 R408 5.7 6.9 C348 1.95 5.15 D300 1.875 1.025 L301 3.5 5.2 R343 1.7 3.1 R409 7.05 7.325 C349 2.175 5.8 D301 1.975 1.025 P300 0.125 3.55 R344 1.75 4.125 R410 6.8 7.325 C350 0.1 5.425 D302 1.65 0.325 Q300 3.85 2.55 R345 0.6 3.2 R411 7.75 10.17 C351 2.4 5.65 D303 1.75 0.325 Q301 2.725 2.75 R346 2.25 3.4 R412 1.45 9.025 C352 1.95 5.65 D304 4.7 1.95 Q302 1.5 2.6 R347 0.675 5.2 R413 2.25 3.925 C353 1.875 6.25 D305 0.2 0.6 Q303 3.575 3.35 R348 2.05 2.1 R414 1.45 8.925 C354 2.375 6.35 D306 0.325 0.6 Q304 4.375 3.35 R349 2.4 9.7 R415 0.175 8.325 C355 0.55 4.575 D307 2.675 1.4 Q305 1.55 3.6 R350 1.15 7.0 R416 4.275 6.75 C356 0.3 4.25 D308 6.25 1.0 Q306 1.4 2.275 R351 1.65 8.3 R417 1.45 8.525 C357 1.925 7.05 D309 4.575 1.0 Q307 4.925 5.8 R352 1.675 2.6 R418 1.275 9.125 C358 2.25 6.775 D310 5.15 1.0 Q308 7.768 5.007 R353 0.1 4.775 R419 0.425 8.725 C359 0.775 8.125 D311 5.775 1.0 Q309 4.972 5.433 R354 1.15 7.1 R420 1.45 8.325 C360 1.35 8.125 D312 4.275 2.55 Q310 7.768 6.109 R355 2.25 3.6 R421 5.95 7.2 C361 0.65 9.95 D313 0.225 1.5 Q311 4.972 6.535 R356 0.7 7.55 R422 0.425 8.625 C362 0.775 8.025 D314 0.35 1.5 Q312 7.768 7.211 R357 0.55 4.675 R423 0.1 8.425 C363 1.975 7.5 D315 1.1 2.6 Q313 3.9 7.4 R358 0.675 4.325 R425 1.875 4.4 C364 1.875 6.9 D316 7.975 4.3 Q314 3.35 7.025 R359 3.625 4.25 R427 2.7 3.725 C365 0.7 8.9 D317 3.725 4.25 Q315 4.972 8.248 R360 1.125 4.425 R428 8.025 9.425 C366 2.275 8.0 D318 4.25 4.25 Q316 0.65 7.85 R361 1.25 3.725 R429 0.2 9.45 C367 0.175 9.0 D319 3.625 4.5 Q317 7.768 8.313 R362 1.125 4.525 R430 1.975 4.4 C368 0.2 8.425 D320 4.125 4.5 Q318 4.8 7.625 R363 1.275 4.425 R431 4.95 7.1 C369 1.35 7.65 D321 1.75 2.5 Q319 4.972 10.05 R364 1.125 5.1 R432 1.65 9.15 C370 0.075 9.55 D322 1.65 4.325 R300 8.225 0.725 R365 1.75 3.825 R433 1.925 8.75

6 - Diagrams

Table 6-2 continued

Ref. X Y Ref. X Y

R434 2.5 9.825 R500 2.175 4.325 R435 2.4 9.825 R505 0.525 6.8 R436 7.05 7.75 R510 6.2 5.1 R437 6.8 7.75 R511 6.2 7.2 R438 4.675 6.875 R512 6.55 5.45 R439 1.925 8.65 R513 6.55 7.75 R440 5.7 7.2 R514 6.2 6.9 R441 5.05 7.125 R515 6.2 9.9 R442 0.35 9.65 R516 6.55 7.325 R443 0.2 9.55 R517 6.55 9.75 R444 4.375 7.9 R520 4.15 9.75 R445 3.425 9.275 R521 2.5 6.05 R446 0.9 9.65 R522 4.25 1.75 R447 2.4 8.45 Rt301 7.4 10.43 R448 1.95 9.675 S300 4.291 10.63 R449 1.95 9.775 T300 4.35 9.925 R450 1.925 8.85 Tp318 4.825 6.05 R451 0.825 9.25 Tp319 4.975 7.63 R452 1.95 9.25 Tp320 4.975 9.475 R453 2.375 8.55 Tp321 4.825 5.15 R454 1.35 9.75 Tp323 3.825 8.825 R455 0.075 9.75 U300 3.85 1.725 R456 1.225 10.02 U301 1.275 1.625 R457 1.125 10.02 U302 3.85 2.15 R458 2.2 9.825 U303 6.275 2.3 R459 2.1 9.825 U304 2.775 1.725 R460 0.6 2.55 U305 1.05 2.4 R461 4.675 7.375 U306 0.575 7.05 R462 4.675 7.275 U308 4.6 5.675 R463 8.275 9.425 U309 2.375 5.55 R464 4.225 7.075 U310 0.475 4.9 R465 4.675 7.175 U311 2.25 6.675 R466 3.6 9.8 U313 2.15 3.825 R467 5.7 9.9 U314 2.175 8.025 R468 5.95 9.9 U315 0.575 8.875 R469 6.8 9.75 U400 0.825 5.6 R470 7.05 9.75 U498 3.925 3.45 R471 4.925 10.82 U499 3.925 3.15 R472 4.725 6.6 Vr300 4.7 1.85 R473 2.7 5.4 Vr301 4.7 2.05 R474 7.85 9.125 Vr302 4.0 5.025 R476 0.525 6.6 Vr303 1.45 8.825 R477 3.75 5.7 Vr304 0.45 4.025 R478 3.2 5.775 Vr305 1.45 8.725 R479 3.2 5.675 Vr335 1.175 4.025 R480 3.75 6.1 W300 3.625 9.45 R481 3.75 6.0 W301 4.65 7.475 R482 4.2 5.8 R483 4.2 5.9 R484 4.025 3.6 R485 3.925 3.675 R486 3.725 4.125 R487 3.825 3.675 R488 0.525 6.9 R489 0.525 6.8 R490 1.35 6.775 R493 1.2 6.675 R494 3.1 8.85 R495 3.2 8.85 R496 3.65 5.975 R497 4.275 6.5 R498 3.75 6.55 R499 3.2 6.775

Figure 6-1. A1 Board Component Locations

Figure 6-2. A4 and A6 Board Component Locations

Figure 6-3. A1 Board schematic (sheet 1)

Figure 6-3. A1 Board schematic (sheet 2)

Figure 6-3. A1 Board schematic (sheet 3)

Figure 6-4. A6 Relay Option Board schematic

Index

—+—

CV_Detect*, 48, 52 CV_Prog, 50, 52

+OUT, 47 +sense, 47

—A—

A1 board removal, 45 A1 Main board, 50 A2 board removal, 44 A2 Interface Board, 48 A2S201, 50 A3 board removal, 45 A3 Front Panel, 48 ADC, 48

—B—

bias voltages, 38, 39

—C—

cal denied, 41 calibration, 41 calibration - post repair, 41 CC, 38 CC line regulation, 17 CC load effect, 18 CC load regulation, 17 CC loop, 52 CC noise, 19 CC- operation, 17 CC source effect, 18 CC_Detect*, 48, 52 CC_Prog, 50, 52 clear password, 41

component locations

A1, 71, 72, 73, 74 A4, 76

constant current tests, 16 constant voltage tests, 14 Control, 50, 52 copyrights, 5 cover removal, 44 current monitoring resistor, 13 current sink, 17 CV, 38 CV load effect, 14 CV loop, 52 CV Noise, 15 CV source effect, 15 CV/CC control, 50, 52

—D—

DAC, 48 disable protection, 40 disassembly - tools, 43 disassembly procedure, 43 downprogramming, 50, 52 DP_Control, 50

—E—

EEPROM, 50 electronic load, 13 electrostatic discharge, 10 error codes, 37

—F—

F309, 50 fan speed, 40 Fan_Prog, 50, 52 firmware revisions, 10, 42 FLT, 47 front panel removal, 44, 45 Fuse, 50

—G—

GPIB, 47

—H—

hazardous voltages, 9 history, 5 HS_Therm, 50

—I—

identification, 5 IDN? query, 42

Imon_H, 50 IMon_H, 52 Imon_L, 50 Imon_P, 50

INH, 47 inhibit calibration, 41 initialization, 42 interface signals, 47

Index

—J—

J307 voltages, 39

—L—

line voltage wiring, 46

—M—

manual revisions, 10

—N—

notice, 5

—O—

-OUT, 47 out of range, 41 OV_Detect*, 48, 52 OV_Prog, 50 OV_SCR*, 48, 52

—P—

PARD, 15, 19 password, 41 performance test form, 19 performance tests, 13 PM_Inhibit, 52 power-on self-test, 37 primary interface, 48 printing, 5 programming, 13 protection, 40

RS-232, 47

—S—

safety considerations, 9 safety summary, 3

schematic

A1, 77, 78, 79 A4, 76

schematic notes, 71 SCR, 52 secondary interface, 48 self-test, 37

-sense, 47 sense switch, 52 serial number, 5 series regulator, 50 shunt clamp, 52 status annunciators, 38

—T—

Temp_Amb, 50 test equipment, 11 test setup, 12 trademarks, 5 transformer removal, 45 transient recovery, 16 troubleshooting - bias and reference supplies, 38, 39 troubleshooting - equipment, 24 troubleshooting - flowcharts, 24 troubleshooting - introduction, 23 troubleshooting - overall, 24 troubleshooting - status annunciators, 38

—U—

—R—

readback accuracy, 14 reference voltages, 38, 39 replaceable parts - binding posts, 57 replaceable parts - chassis, 55 revisions, 10

RmHi, 52 RmLo, 52

ROM upgrade, 42 RPG, 48

UNR, 38

—V—

verification tests, 13 VMon, 50, 52 voltage programming, 14

—W—

warranty, 2

Agilent Technologies 6633B, 66332A, 6632B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty Information

Safety Summary

Notice

Printing History

Instrument Identification

Table of Contents

Introduction

Organization

Safety Considerations

Related Documents

Revisions

Manual Revisions

Firmware Revisions

Electrostatic Discharge

Verification and Performance Tests

Introduction

Test Equipment Required

Measurement Techniques

Test Setup

Electronic Load

Current-Monitoring Resistor

Operation Verification Tests

Performance Tests

Programming

Constant Voltage (CV) Tests

CV Setup

Voltage Programming and Readback Accuracy

CV Load Effect

CV Source Effect

CV Noise (PARD)

Transient Recovery Time

Constant Current (CC) Tests

CC Setup

Current Programming and Readback Accuracy

Current Sink (-CC) Operation

Low Range Current Readback Accuracy

CC Load and Line Regulation

CC Load Effect

CC Source Effect

CC Noise (PARD)

Performance Test Equipment Form

Performance Test Record Forms

Troubleshooting

Introduction

Test Equipment Required

Overall Troubleshooting

Flow Charts

Specific Troubleshooting Procedures

Power-on Self-test Failures

CV/CC Status Annunciators Troubleshooting

Bias and Rail Voltages

J307 Voltage Measurements

Manual Fan Speed Control

Disabling Protection Features

Post-repair Calibration

Inhibit Calibration Switch

Calibration Password

Initialization

ROM Upgrade

Identifying the Firmware

Upgrade Procedure

Disassembly Procedures

List of Required Tools

Cover, Removal and Replacement

A2 Interface Board, Removal and Replacement

Front Panel Assembly, Removal and Replacement

S1 Line Switch, Removal and Replacement

A3 Front Panel Board, Removal and Replacement

A1 Main Control Board

T1 Power Transformer, Removal and Replacement

Line Voltage Wiring

Principles of Operation

Introduction

I/O Interface Signals

A3 Front Panel Circuits

A2 Interface Circuits