Agilent 85901A Service Manual

Operation and Service Manual

Agilent Technologies 85901A

AC Power Source

This manual applies directly to

Agilent 85901A AC Power Sources with

serial numbers prefixed 2838K and below.

Manual Part Number: 85901-90001

Supersedes September 1988

Microfiche Part Number: 85901-90004

Printed in USA

April 2000

© Copyright 1988-2000 Agilent Technologies, Inc.

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.

The following safety symbols are used throughout this manual.
Familiarize yourself with the symbols and their meaning before
operating this instrument.

WARNING Warning denotes a hazard. It calls attention to a procedure

which, if not correctly performed or adhered to, could result in
injury or loss of life. Do not proceed beyond a warning note
until the indicated conditions are fully understood and met.

CAUTION Caution denotes a hazard. It calls attention to a procedure that, if not

correctly performed or adhered to, could result in damage to or
destruction of the instrument. Do not proceed beyond a caution sign
until the indicated conditions are fully understood and met.

NOTE Agilent Technologies certifies that this product met its published

specifications at the time of shipment from the factory. Agilent 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 facility of other
International Standards Organization members.

WARNING Before the charger of the 85901A is switched on, make sure it

has been properly grounded through the protective conductor
of the ac power cable to a socket outlet provided with the
protective earth contact. Any interruption of the protective
(grounding) conductor inside or outside the instrument, or
disconnection of the protective earth terminal, can result in
personal injury.

WARNING There are voltages at many points in the instrument which can,

if contacted, cause personal injury. Be extremely careful. Any
adjustments or service procedures that require operation of the
instrument with the protected covers removed should be
performed only by trained service personnel.

ii

WARNING ALWAYS assume that high voltage is present at the inverter

output and on the power cord adapters. NEVER rely on the
position of the inverter switch or charger switch or on the
front-panel LED indicators to determine if high voltage is
present. Never use a damaged power cord adapter. The inverter
output should be treated as cautiously as you would treat a line
voltage source.

WARNING When the high voltage output of the inverter is exposed, for

example when the 85901A is used in servicing some other
instrument, take extreme safety precautions as you would for
any high voltage exposure. ALWAYS disconnect all inverter
power cords before servicing the load unit. NEVER rely on the
position of the inverter switch or charger switch or on the
front-panel LED indicators to determine if high voltage is
present.

CAUTION Before an instrument is connected to the 85901A, verify that the line

voltage selector of the instrument to be connected is set to the same
voltage as the 85901A inverter output voltage. Failure to set the ac
power input to the correct voltage could cause damage to the
instrument.

Regulatory Notices

Herstellerbescheinigung

Hiermit wird bescheinigt, daβ das Gerät/System 85901A in
Übereinstimmung mit den Bestimmungen von Postverfügung 1046/84
funkentstört ist.

Der Deutschen Bundespost wurde das Inverkehrbringen dieses
Gerätes/Systems angezeigt und die Berechtigung Überprüfung der
Serie auf Einhaltung der Bestimmungen eingeräumt.

Zusaatzinformation fur Meβ-und Testgeräte

Werden Meβ- und Testgeräte mit ungeschirmten Kabeln und/oder in
offenen Meβaufbauten verwendet, so ist vom Betreiber sicherzustellen,
daβ die Funk-Entstörbestimmungen unter Betriebsbedingungen an
seiner Grundstücksgrenze eingehalten werden.

iii

Manufacturer’s Declaration

This is to certify that the equipment 85901A is in accordance with the
Radio Interference Requirements of Directive FTZ 1046/84. The
German Bundespost was notified that this equipment was put into
circulation, the right to check the series for compliance with the
requirements was granted.

Additional Information for Test- and Measurement Equipment

If Test- and Measurement Equipment is operated with unscreened
cables and/or used for measurements on open set-ups, the user has to
assure that under operating conditions the Radio Interference Limits
are still met at the border of his premises.

Warranty

This Agilent Technologies instrument product is warranted against
defects in material and workmanship for a period of one year from date
of shipment. During the warranty period, Agilent Technologies will, at
its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a
service facility designated by Agilent Technologies. Buyer shall prepay
shipping charges to Agilent Technologies and Agilent Technologies
shall pay shipping charges to return the product to Buyer. However,
Buyer shall pay all shipping charges, duties, and taxes for products
returned to Agilent Technologies from another country.

Agilent Technologies warrants that its software and firmware
designated by Agilent Technologies for use with an instrument will
execute its programming instructions when properly installed on that
instrument. Agilent Technologies does not warrant that the operation
of the instrument, or software, or firmware will be uninterrupted or
error-free.

iv

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from
improper or inadequate maintenance by Buyer, Buyer-supplied
software or interfacing, unauthorized modification or misuse, operation
outside of the environmental specifications for the product, or improper
site preparation or 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 BUYER’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.

v

vi

Contents

1. General Information

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

Instruments Covered by This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

2. Installation

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

Preparation for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Inverter Line Voltage and Fuse Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Connecting Internal Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Connecting External Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

Power Cable for Charger Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

Power Cable for Inverter Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

Operating Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

3. Operation

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Front-Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Rear-Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

Charging the Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

Basic Operation Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

Charger Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

Inverter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

4. Performance Tests

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Performance Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

1. Inverter Output Voltage and LED Annunciators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

2. Inverter DC Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

3. Inverter Internal DC Input Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

4. Inverter Shutoff with Charger On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

5. Adjustments

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

Pre-Adjustment Set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

Reference Voltage Adjustment: A2R14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

7

Contents

Charger Output Voltage Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

After Completing All Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

6. Replaceable Parts

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

7. Service

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Overall Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Front-Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Rear-Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-5

DC-to-DC Converter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

Inverter Circuit Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

DC-to-AC Switcher. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

Charger Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Charger Block Diagram Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Flyback Control Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

Power-Limited Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-13

Shut-Off Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

Control Circuit Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14

Control Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14

Status-Sensing Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16

Shut-Off Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17

Buzzer and Indicator Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17

Bias Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

8

1 General Information

1-1

General Information

Introduction

Introduction

This manual contains information required to operate and service the
Agilent Technologies Model 85901A AC Power Source. The 85901A is
shown in Figure 1-1 with all of its externally supplied accessories.

Description

The 85901A is a portable ac power source. It can be operated on the
bench or as a portable power supply for field service. Other uses are for
measurements requiring power line isolation or for measurements
performed during power failure. The instrument has a carrying handle
that can also be used as an adjustable tilt-stand. The handle can be
moved by pushing the sides of the handle in and then turning the
handle to a suitable position.

The 85901A consists of battery, inverter, charger, and control circuits. It
provides up to 200W maximum continuous power with the internal
battery, at either 115 Vrms or 230 Vrms.

The 85901A weighs 14.2 kg (31.3 lbs) with the battery installed, and 8.0
kg (17.6 lbs) without the battery. The rear panel has terminals for
connecting an external battery or other 12 Vdc source. The dimensions
of the package are 337 mm wide by 125 mm high by 461 mm deep.

Specifications

Instrument specifications are listed in Table 1-1. These specifications
are the performance standards or limits against which the instrument
may be tested.

Performance characteristics are listed in Table 1-2. Characteristics
provide useful information by describing typical, non-warranted
instrument performance.

1-2 Chapter 1

General Information

Specifications

Figure 1-1 85901A w/Complete Set of General Purpose Power-Cord

Adapters

Chapter 1 1-3

General Information

Safety Considerations

Safety Considerations

The 85901A AC Power Source has been designed to conform to the
safety requirements of an IEC (International Electromechanical
Committee) Safety Class I instrument, and is shipped from the factory
in a safe condition. This Agilent Technologies 85901A A C Power Source
Operation and Service Manual, and all related documentation, must be
reviewed for familiarization with safety markings and instructions
before operation. This unit is to be used in a controlled environment.

WARNING This unit contains more than one live circuit. See the schematic

diagrams.

This operation and service manual contains safety information,
cautions, and warnings which must be followed by the user to ensure
safe operation and to maintain the instrument in a safe condition.

Instruments Covered by This Manual

This instrument has a two-part serial number in the form of
00000K00000 (see Figure 1-2). The number is stamped on the serial
plate attached to the rear panel of the instrument. The first five digits
and the letter constitute the serial prefix; the last five digits form the
digits. The prefix is the same for all identical instruments, and it
changes only when a change is made to the instrument. The suffix,
however, is assigned sequentially and is different for each instrument.

The contents of this manual apply directly to instruments having the
same serial number prefix(es) listed under "Serial Numbers” on the
title page. The letter placed between the two sets of digits identifies the
country where the instrument was manufactured.

1-4 Chapter 1

Figure 1-2 Typical Serial Number Label

An instrument manufactured after the printing of this manual may
have a serial number prefix that is not listed on the title page. This
unlisted serial number prefix indicates that the instrument is different
from those described in the manual.

General Information

Instruments Covered by This Manual

The manual for a newer instrument is accompanied by a Manual
Updating Supplement, which contains the change information that
explains how to adapt the manual to the newer instrument.

In addition to change information, the supplement may contain
information for correcting errors in the manual. Tokeep this manual as
current and accurate as possible, Agilent recommends that you
periodically request Manual Updating Supplement. The supplements
are identified with the manual print date and part number, both of
which appear on the manual title page. For information concerning a
serial number prefix that is not listed on the title page or in the Manual
Updating Supplement, contact your nearest Agilent office.

Chapter 1 1-5

General Information

Instruments Covered by This Manual

Table 1-1 85901A Specifications

Specifications describe warranted performance over the temperature
range of 0°C to 55°C after one hour continuous operation, unless
otherwise noted.

INPUTS

Inverter

1

Voltage 10.8 Vdc to 14.5 Vdc
Charger

2

Voltage 90 to 250 Vac, auto-selected
Frequency 44 to 66 Hz
Power consumption 122 VA, maximum

OUTPUTS

Inverter
Voltage 135 or 270 V peak 5%

Rectangular waveform with 25%

dead zone (115 or 230 Vrms 5%)
Frequency 60 Hz 0.1%, crystal reference
Maximum power 200W, continuous

1.

The inverter input must not have any transients higher than 14.5 V.
Otherwise, the overvoltage protection circuitwill automatically turn
the inverter off.

2.

Turning the charger on automatically turns the inverter off.

1-6 Chapter 1

Instruments Covered by This Manual

Table 1-2 85901A Characteristics (1 of 2)

ENVIRONMENTAL

General Information

Temperature

1

Operating 0°C to +55°C
Storage: with battery –20°C to +40°C

without battery –40°C to +70°C

EMI

Conducted emission FTZ 1046
Radiated emission FTZ 1046

Battery

23

Type Sealed lead acid
Voltage 12Vdc
Capacity 17 ampere-hours

MECHANICAL

Dimensions: width 337mm (13.3 in)

height 125 mm (4.9 in)
depth 461 mm 18.1 in)

Weight: with battery 14.2 kg (31.3 lb)
without battery 8.0 kg (17.7 lb)

Shipping weight 16.3 kg (36.0 lb)

BATTERY SHELF LIFE

Storage Temperature Recharge Interval

<20°C 18 months

20°C to 30°C12 months

0°C to 40°C 6 months

CERTIFICATION

The 85901A is certified for use with the following Agilent test and
measurement equipment:

HP/Agilent 8562A/B, Agilent 8590A, and Agilent 8592A, and their
options.

1.

Shelf life of battery decreases with either extended operation or storage at
higher than 40C

2.

Battery cyclic life (charge-discharge) is nominally rated at more
than 200 cycles.

3.

Battery is a Matsushita Electric LCR12V17P sealed lead acid. Bat­tery is available from Agilent Technologies as HP/Agilent p/n
1420-0373.

Chapter 1 1-7

General Information

Instruments Covered by This Manual

Figure 1-3 85901A Characteristics (2 of 2)

Table 1-3 Recommended Test Equipment

Instrument Critical Specifications Recommended

Model

Power Supply Output voltage: 9 to 20 Vdc HP/Agilent 6032A √√
Digital

Multimeter
Electronic Load Input voltage: 20 Vdc

4.5 digits display

Input current: 10A minimum

1-8 Chapter 1

HP/Agilent 3487A

Fujitsu
EUL-300D

Where Used

Perf.
Tests

√√√

√√

Adj. Ser-

vice

2 Installation

2-1

Installation

Introduction

Introduction

This chapter provides the information needed to install the 85901A
AC PowerSource. Topics covered include:initial inspection, line voltage
and fuse selection, operating environment, battery charging, battery
replacement, storage, and shipment.

Initial Inspection

The 85901A AC Power Source, as shipped from the factory, meets all
the specifications listed in Table 1-1.

Inspect the shipping container for damage. If the shipping container or
cushioning material is damaged, notify the carrier as well as the
Agilent office and be sure to keep the shipping materials for the
carrier's inspection until the contents of the shipment have been
checked for completeness and the instrument has been checked
mechanically and electrically.

Complete shipment contents are shown in Figure 2-1. A test procedure
for checking general electrical operation may be found under "Basic
Operation Check" in Chapter 3. Performance tests to check the 85901A
against its specifications are given in Chapter 4. If the instrument does
not pass the performance tests, notify the nearest Agilent office (or, to
obtain the address of the Agilent office nearest you, contact an office
listed on the inside rear cover of this manual). The office will arrange
for repair or replacement without waiting for a claim settlement.

CAUTION Before using the 85901A for the first time, the internal battery should

be charged. Follow the procedure for charging the battery in Chapter 3.
If the shipping materials are in good condition, retain them for possible

future use. You may wish to ship the instrument to another location or
return it to Agilent for service.

2-2 Chapter 2

Figure 2-1 85901A Shipping Container and Contents

Installation

Initial Inspection

Chapter 2 2-3

Installation

Preparation for Use

Preparation for Use

Power Requirements

The inverter of the 85901A requires a power source of 10.8 Vdc to 14.5
Vdc. Power consumption is approximately 330W when the 85901A
provides its maximum continuous output capacity of 200W.

WARNING If the instrument is to be energized via an external

autotransformer for voltage reduction, make sure the common
terminal is connected to the neutral pole of the charger input.

CAUTION Before turning the 85901A charger switch on, verify that the line

voltage is within the charger input's voltage range.
The charger circuit of the 85901A requires a power source of 90 to 250

Vac, 47 to 66 Hz, single-phase. You do not need to select the correct
input voltage; the charger circuit automatically does so. Maximum
power consumption in the charging mode is approximately 122 VA.

Inverter Line Voltage and Fuse Selection

CAUTION Before turning the 85901A inverter switch on, verify that the connected

instrument's line voltage selection is set to the same voltage as the
85901A inverter output voltage.

The 85901A voltage selection switch selects the output voltage of the
inverter (115V or 230V).

The appropriate fuses are factory-installed for the instrument's
destination. Figure 2-2 illustrates replacement fuses, and Table 2-1
lists their ratings and part numbers.

CAUTION Before using the 85901A, check that the proper fuse for your line

voltage and selected inverter-output voltage is installed.

2-4 Chapter 2

Figure 2-2 Line Voltage and Fuse Selection

Installation

Inverter Line Voltage and Fuse Selection

Table 2-1 Replacement Fuse Ratings and Part Numbers

No. Function Rating P/N

1 Line Fuse 250V, 1.6A 2110-0773
2 Battery Fuse 32V, 30A 2110-0809
3 Inverter Output Fuse 250V, 4A 2110-0734

Chapter 2 2-5

Installation

Connecting Internal Battery

Connecting Internal Battery

The internal battery for the 85901A is not installed when the
instrument is shipped from the factory. When unpacking the 85901A,
you will find a package containing two battery connectors in the main
container. You will also find two screws and two washers in the battery
container. These connectors and screws are used to install the internal
battery. You will need two screwdrivers, both slotted and Phillips.

WARNING This instrument is independent of the power mains. HIGH

VOLTAGE is present whenever the internal battery has been
installed and the inverter switch is on.

Connecting the battery may cause electrical arcing at the
terminal. Do not connect the battery in an explosive
atmosphere or near inflammable materials.

CAUTION The voltage ratings of the battery should be the same as the input

voltage range of the inverter. Verify that you are installing a battery of
the correct voltage rating.

Connect the internal battery's positive and negative terminals to the
85901A front-panel positive (red wire) and negative (black wire)
internal battery terminals, respectively.

1. Install the two separate battery connectors on the battery.

2. Open the battery door in the right-hand side of the front panel.

3. Place the battery in the 85901A battery cage with its terminals
toward the top. Correct battery position and connection polarity are
shown in Figure 2-3

4. Insert the two internal battery cable terminals into the positive and
negative battery connectors, respectively. Fasten them using the two
screws.

5. Refasten the battery cage door.

Confirm the correct placement of the wide four-terminal shorting strap
at the rear-panel terminal block. Refer to Figure 2-4 for correct
terminal block configurations with either internal or external batteries.

2-6 Chapter 2

Installation

Connecting External Battery

Connecting External Battery

The 85901A AC Power Source can use an external battery by
connecting the external battery to the rear-panel terminal block. Car
and truck 12V batteries can be used for the external battery. Figure 2-4
shows the correct connections from the 85901A terminal block to the
external battery.

WARNING This instrument is independent of the power mains. HIGH

VOLTAGE is present whenever a 12 Vdc source has been
connected and the inverter switch is on.

Connecting the battery may cause electrical arcing at the
terminal. Do not connect the battery in an explosive
atmosphere or near inflammable materials.

NOTE When an external DC voltage source is used, voltage transients must

not exceed 14.5V or the Over Voltage Protection circuitry will shut the
inverter off.

Likewise, if an external charger is connected to an external battery,
voltage transients above 14.5V may turn the 85901A off. This may
happen, for example, when a car battery is used while the car's
alternator is operating.

Chapter 2 2-7

Installation

Connecting External Battery

Figure 2-3 Battery Position and Connector Polarity

2-8 Chapter 2

Figure 2-4 Battery Terminal Block

Installation

Connecting External Battery

CAUTION The voltage ratings of the battery should be the same as the input

voltage range of the inverter. Verify that you are installing a battery of
the correct voltage rating

Connect the external battery's positive and negative terminals to the
85901A rear-panel positive and negative external-battery terminals,
respectively.

Do not remove the wide two-terminal shorting bar on rear-panel
positive and negative external- battery terminals.

Chapter 2 2-9

Installation

Power Cable for Charger Input

Power Cable for Charger Input

The 85901A is equipped with a three-connector power cable.When
connected to an appropriate ac power receptacle, this cable grounds the
instrument cabinet.

WARNING The mains plug may only be inserted in a socket outlet

provided with a protective earth contact. The protective action
must not be negated by the use of an extension cord (power
cable) without a protective conductor (grounding). Grounding
one conductor of a two-conductor outlet is not sufficient
protection. Various power cables are available to connect the
instrument to the types of ac power outlets unique to specific
geographic areas. The cable appropriate for the area to which
the analyzer is originally shipped is included with the unit.

NOTE While the inverter output is used, the 85901A will meet its EMI

specification with the charger input power cable removed.

Power Cable for Inverter Output

The 85901A standard connector is two CEE22-V connectors in place of
the USA standard NEMA-15P connector. The interconnection cable,
Part Number 8120-5220, CEE22-V male to NEMA-15P female, is
provided. This cable is used to connect external instruments to the
inverter output.

Other general-purpose power-cord adapters are available.The adapters
listed below allow country-specific line cords to be plugged into the
85901A AC Power Source.

Europe HP/Agilent Part Number 8120-5210
U.S.A. HP/Agilent Part Number 8120-5211
United Kingdom HP/Agilent Part Number 8120-5212

2-10 Chapter 2

Installation

Operating Environment

Operating Environment

Temperature

The 85901A may be operated over temperatures from O°C to +55°C.
Temperatures above +400C may reduce the life of the battery.

Humidity

The 85901A may be operated in environments with relative humidities
up to 95% and to +40°C. However, the 85901A should be protected from
temperature extremes, which cause condensation within the
instrument.

Installation

The 85901A can be operated on the bench or as a portable power supply
for field use. The instrument has a carrying handle that can also be
used as an adjustable tilt-stand. The handle can be moved by pushing
its sides in and then turning the handle to the desired position.

The battery must be installed before the 85901A can be operated. See
the battery-installation instructions, above. Before turning on the
85901A inverter switch, verify that the same line voltage is selected for
both the 85901A inverter output and the equipment connected to the
inverter output.

Chapter 2 2-11

Installation

Storage and Shipment

Storage and Shipment

Environmental

The 85901A with battery may be stored and shipped in environments
within the following limits:

Temperature –20°C to +40°C
Humidity <95%

Altitude <50,000 ft
The 85901A should be protected from temperature extremes, which
cause condensation inside the equipment.

Packaging

Original packaging is shown in Figure 2-1. Containers and materials
identical to those used in factory packaging are available through
Agilent offices. If the instrument is being returned to Agilent for
servicing, attach a tag indicating the type of service required, return
address, model number, and full serial number. Mark the container
FRAGILE to assure careful handling. In any correspondence, refer to
the instrument by model number and full serial number.

Other packaging may be used if these general instructions for
repackaging with commercially-available materials are followed:

a. Wrap instrument in heavy paper or plastic. If it is being shipped to

an Agilent office or service center, attach tag indicating the type of
service required, return address, model number, and full serial
number.

b. Use a strong shipping container. A double-walled carton made of

350-pound test material is adequate.

c. Use enough shock-absorbing material (3- to 4-inch layer) around all

sides of instrument to provide firm cushioning and prevent

movement inside the container.
d. Seal shipping container securely.
e. Mark shipping container FRAGILE to ensure careful handling.

2-12 Chapter 2

3 Operation

3-1

Operation

Introduction

Introduction

This chapter provides operating instructions for the 85901A AC Power
Source. It also provides a brief description of the front- and rear-panel
features.

Upon receipt of the 85901A AC Power Source, perform the procedure
described under "Basic Operation Check" in this chapter. This check
should also be performed after the instrument has been repaired. LED
indicators, which represent the status of the battery, inverter, and
charger circuits, are located on the left-hand side of the front panel. See
Figure 3-1.

Front-Panel Features

LED indicators, which represent the status of the battery, inverter, and
charger circuits, are located on the left-hand side of the front panel. See
Figure 3-1.

The battery function area has two LEDs: the yellow LED indicates
whether the charger is on or off, and the red LED indicates the state of
the battery charger circuit. When the charger is operating, the red LED
will be on if the battery-charging current is greater than 0.45 A 0.15 A,
and it will be off if the battery-charging current is less than

0.45 A 0.15 A.
The inverter function area includes a yellow LED and the inverter

on/off switch. The LED should be on when the inverter switch is on and
the inverter is operating, and it should be off when the inverter is not
operating. The inverter will not operate while the battery charger is
operating.

During inverter operation, the red LED in the battery function area
also is used to indicate the stateofthe battery output voltage. When the
inverter is operating, the red LED will be off when battery voltage is
greater than 10.8 V typical, and it will blink (accompanied by a buzzer)
when battery voltage is less than 10.8 V typical.

The battery door occupies the remaining part of the front panel. This
door provides access for battery service.

3-2 Chapter3

Figure 3-1 Front-Panel Features

Operation

Front-Panel Features

Figure 3-2 Rear-Panel Features

Chapter 3 3-3

Operation

Rear-Panel Description

Rear-Panel Description

The charger on/off switch is located in the upper left-hand corner of the
rear panel (see Figure 3-2). A yellow LED in the front-panel battery
function area indicates whether the charger is on or off. The charger
input line module is mounted directly below the charger switch. The
line module contains the I-6A 250V charger input fuse.

The inverter voltage selection switch, two CEE-22V receptacles, and 4A
250V inverter output fuse are grouped together by the INV OUTPUT
bracket. The voltageselection switch sets the inverter output to 115V or
230V.

The internal battery fuse and external battery fuse (both 30A 32 Vdc)
are located above the inverter output receptacles.

The battery selection terminal block occupies the upper right-hand half
of the rear panel. Select the internal battery or an external battery by
changing the position of the shorting bar on the terminal block. The
external battery's positive and negative leads are connected to the
terminals marked plus and minus, respectively.

Charging the Battery

Before the 85901A is used for the first time, the internal battery should
be charged for up to six hours. This will ensure that the battery has its
maximum charge.

1. After the internal battery has been installed, connect the power

cable to the rear-panel charger line receptacle (directly under the

charger switch).

2. Check the rear-panel battery terminal block to ensure that the

battery selection jumper is connected for INT battery selection.

3. Check to make sure that no other equipment is connected to the

inverter output receptacles at this time.

4. Turn on the charger switch. Verify that the yellow LED in the

front-panel battery function area has turned on.

5. Let the charger continue to operate until the red LED turns off. This

indicates that the battery has been fully charged.

6. Turn off the charger switch. The 85901A is now ready for normal

use.

CAUTION The charger circuit is designed for use with the internal battery. Do not

use it to charge an external battery.

3-4 Chapter3

Operation

Basic Operation Check

Basic Operation Check

The following steps will verify basic operation of the 85901A. These
short procedures will not verify that the 85901A meets all its
specifications; they are intended simplyas a quick method to verify that
all major functions of the 85901A operate correctly. To verify that the
instrument meets its specifications, or in case of a problem, refer to
Chapter 4 for the appropriate inverter or charger performance test.

Charger Operation

Refer to “Charging the Battery” in this chapter to verify that the
charger is functioning correctly.

Inverter Operation

This procedure verifies that the inverter is functioning correctly.

1. Ensure that the charger and inverter switches are turned off.

2. Connect an external instrument to one of the INV OUTPUT
receptacles using the appropriate power cable and/or adapter cable.

3. Turn on the front-panel inverter switch. The yellow LED in the
inverter function area just above the inverter switch should be on.
Turn on the equipment connected to the inverter output.

4. The red LED in the battery function area should not be lit if the
battery voltage is greater than 10.8 Vdc typical; if the battery
voltage is less than 10.8 Vdc typical, the red LED should blink and a
buzzer should sound. The inverter will not operate when the battery
output voltage is greater than 14.5 Vdc typical or less than 10.0 Vdc
typical.

5. Turn on the rear-panel charger switch. The inverter LED and the ac
inverter output should turn off. The yellow battery-function LED
should turn on, indicating that the charger is operatingandhas shut
off the inverter. The red battery-function LED indicates the state of
the battery-charging current: it will be lit if the battery-charging
current is greater than 0.45 A 0.15 A; it will not be lit if the
battery-charging current is less than 0.45 A 0.15 A.

6. Turn off the charger and inverter switches. Wait five seconds, then
turn on the inverter switch. The inverter ac output should again be
present and operate the external equipment.

Chapter 3 3-5

Operation

Basic Operation Check

3-6 Chapter3

4 Performance Tests

4-1

Performance Tests

Introduction

Introduction

The procedures in this section test the instrument's electrical
performance using the specifications of Table 1-1 as performance
standards. These tests can be performed without access to the interior
of the instrument.

Equipment Required

Equipment required for the performance tests is listed in Table 1-3.
Any equipment that satisfies the critical specifications given in the
table may be substituted for the recommended model(s).

CAUTION To prevent short-circuits, use suitable wire terminals for wire leads

connected to the rear-panel terminal block.

Performance Test Record

Results of the performance tests may be tabulated at the end of this
chapter in Table 4-1. The table lists all the tested specifications and
their acceptable limits.Test results recorded at incoming inspectioncan
be used for comparison in periodic maintenance, troubleshooting, and
after repairs or adjustments.

4-2 Chapter4

Performance Tests

1. Inverter Output Voltage and LED Annunciators

1. Inverter Output Voltage and LED

Annunciators

This test measures the output voltage of the inverter, and verifies
operation of the front-panel LED annunciators.

Specification

1. The inverter output voltage is a modified square wave of 135V or 270V,with a
25% dead zone at the zero voltage level. The output voltage waveform, with
period timing and peak voltage levels, is shown in the illustration. (Note:
135V or 270V peak 5% is equivalent to 115 Vrms or 230 Vrms 5%.)

Inverter output voltage
Output frequency

LED Annunciators

Battery charge (yellow LED) OFF
Battery charge low (red LED)
Inverter (yellow LED) ON

1

Figure 4-1 Inverter Performance Test Setup

115 Vrms 7% or 230 Vrms 7%

60 Hz, Crystal Reference

OFF

Chapter 4 4-3

Performance Tests

1. Inverter Output Voltage and LED Annunciators

Equipment

Power Supply.......................................................HP/Agilent 6032A

Digital Multimeter ..............................................HP/Agilent 3478A

WARNING This instrument is independent of power mains. High voltage

will be present at the inverter output, and at the resistive
load(s), whenever the internal battery or an external 12 Vdc
source is installed and the inverter switch is on.

Procedure

1. Connect the equipment as shown in Figure 4-1.

2. Turn off the rear-panel charger switch. Set the INV OUTPUT
voltage selector switch to 115 Vrms.

3. Connect the four-wide shorting strap in rear-panel terminal block to
the EXT DC IN position.

4. Adjust the power supply for a dc input voltage of 12.0 Vdc 0.1 Vdc.

5. Turn on the inverter switch.

6. Read the inverter output voltage on the digital multimeter and
confirm that the LED annunciators operate correctly.

7. Turn off the inverter switch and set the INV OUTPUT voltage
selector switch to 230 Vrms.

8. Repeat steps 4 through 6 for 230 Vrms.

9. Record the results of steps 6 and 8 in Table 4-1.

4-4 Chapter4

Performance Tests

2. Inverter DC Input Voltage Range

2. Inverter DC Input Voltage Range

This test verifies inverter operation over the specified input voltage
range, and the LED annunciator.

Specification

Inverter input voltage range 10.8 Vdc to 14.5 Vdc
LED Annunciators
Battery charge (yellow LED) OFF
Battery charge low (red LED) See procedure
Inverter (yellow LED) ON

Equipment

Power Supply................................................HP/Agilent 6032A

Digital Multimeter........................................HP/Agilent 3478A

WARNING This instrument is independent of power mains. High voltage

will be present at the inverter output, and at the resistive
load(s), whenever the internal battery or an external 12 Vdc
source is installed and the inverter switch is on.

Procedure

1. Connect the equipment as shown in Figure 4-1.

2. Turn off the rear-panel charger switch. Set the INV OUTPUT
voltage selector switch to 115 Vrms.

3. Connect the four-wide shorting strap in rear-panel terminal block to
the EXT DC IN position.

4. Adjust the power supply for a dc input voltage of 12.0 Vdc 0.1 Vdc.

5. Turn on the inverter switch. Decrease the inverter dc input voltage
until the battery LED blinks and the buzzer beeps. The voltmeter of
the power supply should indicate 11.0 Vdc or lower.

6. Turn off the inverter switch. Adjust the power supply for a inverter
dc input voltage of 12.0 Vdc 0.1 Vdc.

7. Turn on the inverter switch. Decrease the inverter dc input voltage
until the inverter is shut off. The voltmeter of the power supply
should indicate 10.5 Vdc or lower.

8. Turn off the inverter switch. Increase the inverter dc input voltage
to 12.0 Vdc 0.1 Vdc.

Chapter 4 4-5

Performance Tests

2. Inverter DC Input Voltage Range

9. Turn on the inverter switch. Increase the inverter dc input voltage
until the inverter shuts off. The voltmeter of the power supply
should indicate 14.5 Vdc or higher.

NOTE When an external DC voltage source is used, voltage transients must

not exceed 14.5V or the Over Voltage Protection circuitry will shut the
inverter off.

10.Record the results of steps 6, 8, and 9 in Table 4-1.

4-6 Chapter4

Performance Tests

3. Inverter Internal DC Input Operation

3. Inverter Internal DC Input Operation

This test measures the 115V and 230V outputs of the inverter
operating with the internal battery as the dc input voltage source.

CAUTION Before performing this test, ensure that the internal battery is not

completely discharged.

Specification

Inverter output voltage 115 Vrrns 7% or 230 Vrms 7%
Output frequency 60 Hz, Crystal Reference

Equipment

Power Supply...................................................6032A

Digital Multimeter...........................................3478A

WARNING This instrument is independent of power mains. High voltage

will be present at the inverter output, and at the resistive
load(s), whenever the internal battery or an external 12 Vdc
source is installed and the inverter switch is on.

Procedure

1. Connect the equipment as shown in Figure 4-1, without the power
supply.

2. Turn off the rear-panel charger switch. Set the INV OUTPUT
voltage selector switch to 115 Vrms.

3. Connect the four-wide shorting strap in rear-panel terminal block to
the INT DC IN position. This uses the internal battery as the input
voltage source.

4. Open the front-panel battery door and ensure that the internal
battery terminals are connected to the correct positions.

5. Turn on the inverter switch and record the digital multimeter
reading.

6. Turn off the inverter switch and set the INV OUTPUT voltage
selector switch to 230 Vrms.

7. Repeat step 5 for 230 Vrms.

8. Record the results in Table 4-1.

Chapter 4 4-7

Performance Tests

4. Inverter Shutoff with Charger On

4. Inverter Shutoff with Charger On

This test verifies that the inverter will automatically turn off if, while it
is on, the charger is turned on.

Specification

Inverter output voltage is automatically turned off when the charger is
turned on.

Equipment

Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . .HP/Agilent 6032A

Digital Multimeter . . . . . . . . . . . . . . . . . . . . .HP/Agilent 3478A

WARNING This instrument is independent of power mains. High voltage

will be present at the inverter output, and at the resistive
load(s), whenever the internal battery or an external 12 Vdc
source is installed and the inverter switch is on.

Procedure

1. Connect the equipment as shown in Figure 4-1, without the power
supply.

2. Turn off the rear-panel charger switch. Set the INV OUTPUT
voltage selector switch to 115 Vrms.

3. Connect the four-wide shorting strap in rear-panel terminal block to
the INT DC IN position.

4. Turn on the inverter and verify that the digital multimeter indicates
115 Vrms.

5. Connect the charger to the ac mains. Turn on the charger.

6. Verify that the digital multimeter indicates that the inverter has
turned off.

7. Turn off the inverter switch and the charger switch. Record this
operation in Table 4-1.

4-8 Chapter4

Table 4-1 Performance Test Record

Performance Tests

4. Inverter Shutoff with Charger On

1.

Test

No.

Inverter Output Voltage and LED Annunciators

Test Item Results

6. LED status:
BATT CHRG (yellow): OFF ON OFF
BATT LOW (red): OFF ON OFF
INV (yellow): ON ON OFF

Inverter output (Vrms) 106.95 123.05

9. Inverter output (Vrms) 213.90 246.10

2. InverterDC Input Voltage Range

6. Battery low indication (blinking LED)
DC input voltage (Vdc) 11.0

Min. Actual Max.

8. Lower limit
DC input voltage (Vdc) 10.5

9. Upper limit
DC input voltage (Vdc) 14.5

3. Inverter Internal DC Input Operation

Inverter output (Vrms) 106.95 123.05

4. Inverter Shutoff with Charger On

Inverter operation: automatic shutoff YES NO

213.90 246.10

Chapter 4 4-9

Performance Tests

4. Inverter Shutoff with Charger On

4-10 Chapter4

5 Adjustments

5-1

Adjustments

Introduction

Introduction

This chapter describes adjustments required to return the 85901A AC
Power Source to peak operating condition after repairs are required.
Test setups and adjustment procedures are included in this chapter.

Data taken during adjustments should be recorded in the spaces
provided. Comparison of initial data with data taken during periodic
adjustments assists in preventive maintenance and troubleshooting.

Testpoints and adjustment locations are supplied in Chapter 7 and are
placed just before the schematic for the assembly.

Equipment Required

Table 1-3 in Chapter 1 contains a list of test equipment and test
accessories required in the adjustment procedures. In addition, the
table contains the required minimum specifications and a suggested
manufacturer's model number.

Pre-Adjustment Set-up

This short procedure warms up the A2 Control and A3 Charger board
assemblies to remove any component value shift that might affect the
adjustments.

1. Turn off the charger switch and the inverter switch.

2. Remove the 85901A cover with a 4 mm hex wrench.

WARNING This instrument is independent of power mains. HIGH

VOLTAGE is present whenever the internal battery has been
installed and the inverter switch is on.

3. Disconnect the wide four-terminal shorting strap in rear-panel
terminal block. Connect the (+) terminal of electronic load to DC IN
terminal of rear-panel terminal block and the (–) terminal of
electronic load to 12V EXT BATT (–) terminal of rear-panel terminal
block.

5-2 Chapter5

Adjustments

Reference Voltage Adjustment: A2R14

CAUTION Be sure to connect the electronic load with the correct polarity. Do not

let the cables short to the chassis.

4. Set the electronic load for 100Ω load.

5. Turn the charger switch ON

Reference Voltage Adjustment: A2R14

This procedure sets the 3.0V reference voltage, by A2R14, used
throughout the A2 Control assembly circuits.

1. Connect the negative (–) Digital Voltmeter probe to A2TP3, and the
positive (+) probe to test point A2TP2. Refer to Figure 5-1.

2. Set the digital voltmeter to DC Volts and Autorange.

3. Adjust A2R14 for 3.000 0.001 Vdc. Refer to Figure 5-1.

4. Disconnect the probes from A2TP2 and A2TP3. Refer to Figure 5-1.

5. Turn the charger switch off.

Figure 5-1 A2R14 Reference Voltage Adjustment Location

Chapter 5 5-3

Adjustments

Charger Output Voltage Adjustment

Charger Output Voltage Adjustment

This procedure sets the charger output voltage by setting A3R24 in one
leg of the constant-voltage feedback-amplifier bridge. The feedback
voltage picked up from the output of the charger sets the input voltage
of the bridge.

CAUTION Be sure to connect the internal battery cable terminals with the correct

polarity. Do not let the cables short to the chassis.

1. Move the charger board jumper A3J4 from across pins 1-2 to pins
2-3. Refer to Figure 5-2.

2. Turn the charger switch on.

3. Adjust A3R24 for 14.5 Vdc 0.1 Vdc across the electronic load. Refer
to Figure 5-2.

4. Turn the charger switch off.

5. Move jumper A3J4 from across pins 2-3 to its originalpositionacross
pins 1-2. Refer to Figure 5-2.

Figure 5-2 A3R24 Charger Output Voltage Adjustment Location

5-4 Chapter5

Adjustments

After Completing All Adjustments

After Completing All Adjustments

1. Disconnect the electronic load from the rear-panel terminal block.

2. Connect the wide four-terminal shorting strap to the desired
position. Refer to “Connecting Internal Battery” or “Connecting
External Battery” in Chapter 2.

3. Reinstall the 85901A metal cover with a 4 mm hex wrench.

Chapter 5 5-5

Adjustments

After Completing All Adjustments

5-6 Chapter5

6 Replaceable Parts

6-1

Replaceable Parts

Introduction

Introduction

This chapter contains information for ordering parts. The tables list all
replaceable parts in order by reference designator. Overall, top, and
bottom views of assembly locations are illustrated in Figures 6-1 and
6-2.

To order a part listed in the replaceable parts tables, quote the Agilent
Technologies part number, indicate quantity required, and address the
order to the nearest Agilent Technologies office. Toobtain the address of
the office nearest you, inquire of one of the Agilent Technologies Sales
and Service Offices listed in Chapter 7.

6-2 Chapter6

Replaceable Parts

Introduction

Table 6-1 Al Inverter Board Assembly, Replaceable Parts

Reference
Designation

A1 85901-60001 1 1 INVERTER BOARD ASSEMBLY 28480 85901-60001
A1C2 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C 0160-7059 3 1 CAPACITOR-FXD 1UF 250VDC MPE 10% 28480 0160-7059
A1C4 0180-4107 8 1 CAPACITOR-FXD 2800UF 25VDC AL 28480 0180-4107
A1C5 0180-4107 8 1 CAPACITOR-FXD 2800UF 25VDC AL 28480 0180-4107
A1C6 0160-0263 7 1 CAPACITOR-FXD 0.22UF 50VDC CER 20% 28480 0160-0263
A1C7 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C9 0180-3737 8 1 CAPACITOR-FXD IUF 50VDC AL 28480 0180-3737
A1C10 0160-7081 1 1 CAPACITOR-FXD 470PF 50VDC CER 20% 28480 0160-7081
A1C11 0160-7084 4 1 CAPACITOR-FXD 2200PF 50VDC PP 2% 28480 0160-7084
A1C12 0180-2984 5 1 CAPACITOR-FXD 47UF 50VDC AL 28480 0180-2984
A1C13 0160-3831 1 1 CAPACITOR-FXD 0.01UF 50VDC CER 20% 28480 0160-3831
A1C14 0160-0263 7 1 CAPACITOR-FXD 0.22UF 50VDC CER 20% 28480 0160-0263
A1C15 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C17 0160-7080 0 1 CAPACITOR-FXD 220PF 50VDC CER 5% 28480 0160-7080
A1C18 0160-7080 0 1 CAPACITOR-FXD 220PF 50VDC CER 5% 28480 0160-7080
A1C19 0160-7078 6 1 CAPACITOR-FXD 0.1UF 200VDC PP 10% 28480 0160-7078
A1C20 0160-7078 6 1 CAPACITOR-FXD 0.1UF 200VDC PP 10% 28480 0160-7078
A1C21 0160-7078 6 1 CAPACITOR-FXD 0.1UF 200VDC PP 10% 28480 0160-7078
A1C22 0180-2984 5 1 CAPACITOR-FXD 47UF 50VDC AL 28480 0180-2984
A1C23 0160-7078 6 1 CAPACITOR-FXD 0.1UF 200VDC PP 10% 28480 0160-7078
A1C24 0160-7083 3 1 CAPACITOR-FXD 820PF 50VDC CER 4% 28480 0160-7083
A1C25 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C26 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C27 0160-7086 6 1 CAPACITOR-FXD 270PF 1000VDC CER 20% 28480 0160-7086
A1C28 0160-7086 6 1 CAPACITOR-FXD 270PF 1000VDC CER 20% 28480 0160-7086
A1C29 0160-0263 7 1 CAPACITOR-FXD 0.22UF 50VDC CER 20% 28480 0160-0263
A1C30 0160-7082 2 1 CAPACITOR-FXD 120PF 50VDC CER 5% 28480 0160-7082
A1C31 0160-0263 7 1 CAPACITOR-FXD 0.22UF 50VDC CER 20% 28480 0160-0263
A1C32 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C33 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C34 0180-3215 7 1 CAPACITOR-FXD 100UF 16VDC AL 28480 0180-3215
A1C35 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A1C36 0160-7076 4 1 CAPACITOR-FXD 0.033UF 630V MPE 10% 28480 0160-7076
A1C37 0180-0224 2 1 CAPACITOR-FXD 10UF 16VDC AL 28480 0180-0224
A1C38 0180-0224 2 1 CAPACITOR-FXD 10UF 16VDC AL 28480 0180-0224
A1C39 0160-4535 4 1 CAPACITOR-FXD 1UF 50VDC CER 10% 28480 0160-4535
A1C40 0160-7076 4 1 CAPACITOR-FXD 0.033UF 630V MPE 10% 28480 0160-7076
A1C41 0160-7077 5 1 CAPACITOR-FXD 0.1UF 630V MPE 10% 28480 0160-7077
A1C42 0160-7076 4 1 CAPACITOR-FXD 0.033UF 630V MPE 10% 28480 0160-7076
A1C43 0160-7074 2 1 CAPACITOR-FXD 0.033UF 100V MPE 10% 28480 0160-7074
A1C44 0160-7074 2 1 CAPACITOR-FXD 0.033UF 100V MPE 10% 28480 0160-7074
A1C45 0180-4109 0 1 CAPACITOR-FXD 330UF 200VDC AL 28480 0180-4109
A1C46 0180-4109 0 1 CAPACITOR-FXD 330UF 200VDC AL 28480 0180-4109
A1C47 0160-7076 4 1 CAPACITOR-FXD 0.033UF 630V MPE 10% 28480 0160-7076

Part Number CD Qty Description Mfr Code Mfr Part

Number

Chapter 6 6-3

Replaceable Parts

Introduction

Table 6-1 Al Inverter Board Assembly, Replaceable Parts

Reference
Designation

A1C48 0160-7074 2 1 CAPACITOR-FXD 0.033UF 100V MPE 10% 28480 0160-7074
A1C49 0160-7074 2 1 CAPACITOR-FXD 0.033UF I00V MPE 10% 28480 0160-7074
A1C50 0160-4535 4 1 CAPACITOR-FXD 1UF 50VDC CER 10% 28480 0160-4535
A1C51 0160-7079 7 1 CAPACITOR-FXD 39PF 50VDC CER 10% 28480 0160-7079
A1C52 0160-7079 7 1 CAPACITOR-FXD 39PF 50VDC CER 10% 28480 0160-7079
A1C54 0180-3215 7 1 CAPACITOR-FXD 100UF 16VDC AL 28480 0180-3215
A1CR1 1901-0978 4 1 DIODE-GEN PRP 28480 1901-0978
A1CR2 1901-0978 4 1 DIODE-GEN PRP 28480 1901-0978
A1CR3 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR4 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR5 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR6 1901-0646 3 1 DIODE-PWR RECT 200V 1A 150NS 28480 1901-0646
A1CR7 1901-1165 3 1 DIODE-SCHOTTKY 28480 1901-1165
A1CR8 1901-1165 3 1 DIODE-SCHOTTKY 28480 1901-1165
A1CR9 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR10 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR11 1901-1273 4 1 DIODE-GEN PRP 100V 6A 35NS 28480 1901-1273
A1CR12 1901-0646 3 1 DIODE-PWR RECT 200V 1A 150NS 28480 1901-0646
A1CR13 1901-0646 3 1 DIODE-PWR RECT 200V 1A 150NS 28480 1901-0646
A1CR14 1901-1273 4 1 DIODE-GEN PRP 100V 6A 35NS 28480 1901-1273
A1CR15 1901-1273 4 1 DIODE-GEN PRP 100V 6A 35NS 28480 1901-1273
A1CR16 1901-1273 4 1 DIODE-GEN PRP 100V 6A 35NS 28480 1901-1273
A1CR17 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR18 1901-1233 6 1 DIODE-GEN PRP 1000V 4A 75NS 28480 1901-1233
A1CR19 1901-1233 6 1 DIODE-GEN PRP 1000V 4A 75NS 28480 1901-1233
A1CR20 1901-1233 6 1 DIODE-GEN PRP 1000V 4A 75NS 28480 1901-1233
A1CR21 1901-1233 6 1 DIODE-GEN PRP 1000V 4A 75NS 28480 1901-1233
A1CR26 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR27 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR28 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR29 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR30 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1CR31 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A1R88 2110-0665 0 1 TPN00326 0 1 RESISTOR-FUSIBLE 1 5% 0.5W 28480 2110-0665
A1F2 2110-0665 0 1 FUSE 1A 125V 28480 2110-0665
A1J1 1251-4381 2 1 CONNECTOR-POST-TP-HDR 7P 28480 1251-4381
A1J2 1252-2787 0 1 CONNECTOR-POST-TP-HDR 3P 28480 1252-2787
A1J3 1252-2786 9 1 CONNECTOR-POST-TP-HDR 2P 28480 1252-2786
A1L3 9140-1346 6 1 INDUCTOR-FXD 2MH 0.4A 28480 9140-1346
A1L4 9140-1347 7 1 INDUCTOR-FXD 600UH 28480 9140-1347
A1L5 9140-1347 7 1 INDUCTOR-FXD 600UH 28480 9140-1347
A1Q1 1884-0332 6 1 THYR-SCR TO-220AB VRRM=200 28480 1884-0332
A1Q2 1854-0215 1 1 TRANSISTOR NPN SI TO-92 28480 1854-0215
A1Q3 1854-0215 1 1 TRANSISTOR NPN SI TO-92 28480 1854-0215
A1Q4 1855-0694 2 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0694

Part Number CD Qty Description Mfr Code Mfr Part

Number

6-4 Chapter6

Replaceable Parts

Introduction

Table 6-1 Al Inverter Board Assembly, Replaceable Parts

Reference
Designation

A1Q5 1855-0694 2 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0694
A1Q6 1855-0694 2 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0694
A1Q7 1855-0694 2 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0694
A1Q8 1855-0631 7 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0631
A1Q9 1855-0631 7 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0631
A1Q10 1855-0631 7 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0631
A1Q11 1855-0631 7 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0631
A1Q12 1855-0518 9 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0518
A1Q13 1855-0518 9 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0518
A1Q14 1855-0518 9 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0518
A1Q15 1855-0518 9 1 TRANSISTOR MOSFET N-CHAN 28480 1855-0518
A1R1 0699-1301 7 1 RESISTOR 4.7M 5% .25W CF 28480 0699-1301
A1R3 0757-0338 2 1 RESISTOR 1K 5% .25W CF 28480 0757-0338
A1R4 0757-0338 2 1 RESISTOR 1K 5% .25W CF 28480 0757-0338
A1R5 0698-5523 1 1 RESISTOR 1.50K 1% .25W F 28480 0698-5523
A1R6 0698-4623 0 1 RESISTOR 1.37K 1% .25W F 28480 0698-4623
A1R7 0757-0757 9 1 RESISTOR 15K 1% .25W F 28480 0757-0757
A1R8 0757-0757 9 1 RESISTOR 15K 1% .25W F 28480 0757-0757
A1R9 0683-6825 7 1 RESISTOR 6.8K 5% .25W CF 28480 0683-6825
A1R10 0757-0342 8 1 RESISTOR 100K 1% .25W F 28480 0757-0342
A1R11 0757-0298 3 1 RESISTOR 22K 1% .25W CF 28480 0757-0298
A1R13 0698-4703 7 1 RESISTOR 8.66K 1% .25W F 28480 0698-4703
A1R14 0698-3231 4 1 RESISTOR 28K 1% .25W F 28480 0698-3231
A1R15 0757-0757 9 1 RESISTOR 15K 5% .25W CF 28480 0757-0757
A1R16 0683-0338 5 1 RESISTOR 1K 5% .25W CF 28480 0683-0338
A1R17 0699-2522 6 1 RESISTOR 3.0 1% .25W F 28480 0699-2522
A1R18 0683-2215 1 1 RESISTOR 220 5% .25W CF 28480 0683-2215
A1R19 0757-0340 6 1 RESISTOR 10K 5% .25W CF 28480 0757-0340
A1R20 0757-0340 6 1 RESISTOR 10K 5% .25W CF 28480 0757-0340
A1R23 0757-0340 6 1 RESISTOR 10K 5% .25W CF 28480 0757-0340
A1R24 0757-0739 7 1 RESISTOR 2K 1% .25W F 28480 0757-0739
A1R26 0757-0497 4 1 RESISTOR 22 5% .25W CF 28480 0757-0497
A1R27 0757-0497 4 1 RESISTOR 22 5% .25W CF 28480 0757-0497
A1R28 0757-0497 4 1 RESISTOR 22 5% .25W CF 28480 0757-0497
A1R30 0757-0739 7 1 RESISTOR 2K 5% .25W CF 28480 0757-0739
A1R31 0757-0739 7 1 RESISTOR 2K 5% .25W CF 28480 0757-0739
A1R32 0698-7433 6 1 RESISTOR 3K 5% .25W CF 28480 0683-3025
A1R33 0811-3814 1 1 RESISTOR 220 10% 10W PW 28480 0811-3814
A1R34 0811-3816 3 1 RESISTOR 47 10% 10W PW 28480 0811-3816
A1R35 0757-0497 4 1 RESISTOR 22 5% .25W CF 28480 0757-0497
A1R36 0757-0739 7 1 RESISTOR 2K 5% .25W CF 28480 0757-0739
A1R37 0811-3816 3 1 RESISTOR 47 10% 10W PW 28480 0811-3816
A1R38 0811-3814 1 1 RESISTOR 220 10% 10W PW 28480 0811-3814
A1R39 0757-0739 7 1 RESISTOR 2K 5% .25W CF 28480 0757-0739
A1R40 0757-0776 2 1 RESISTOR 110K 5% .25W CF 28480 0757-0776

Part Number CD Qty Description Mfr Code Mfr Part

Number

Chapter 6 6-5

Replaceable Parts

Introduction

Table 6-1 Al Inverter Board Assembly, Replaceable Parts

Reference
Designation

A1R41 0683-4725 2 1 RESISTOR 4.7K 5% .25W CF 28480 0683-4725
A1R42 0811-3817 4 1 RESISTOR 20K 10% 5W PW 28480 0811-3817
A1R43 0811-3817 4 1 RESISTOR 20K 10% 5W PW 28480 0811-3817
A1R44 0811-3817 4 1 RESISTOR 20K 10% 5W PW 28480 0811-3817
A1R45 0757-0340 6 1 RESISTOR 10K 1% .25W F 28480 0757-0340
A1R46 0698-3757 9 1 RESISTOR 1.2K 1% .25W F 28480 0698-3757
A1R47 0699-1797 5 1 RESISTOR 10M 5% .25W F 28480 0699-1797
A1R49 0683-4705 8 1 RESISTOR 47 5% .25W CF 28480 0683-4705
A1R50 0757-0772 8 1 RESISTOR 68.1K 1% .25W F 28480 0757-0772
A1R51 0757-0772 8 1 RESISTOR 68.1K 1% .25WF 28480 0757-0772
A1R52 0698-4627 4 1 RESISTOR 1.54K 1% .25W F 28480 0698-4627
A1R53 0757-0092 5 1 RESISTOR 33K 1% .25W F 28480 0757-0092
A1R54 0698-3506 6 1 RESISTOR 470 1% .25W CF 28480 0698-3506
A1R55 0757-0342 8 1 RESISTOR 100K 1% .25W CF 28480 0757-0342
A1R56 0683-3315 4 1 RESISTOR 330 5% .25W CF 28480 0683-3315
A1R57 0683-4735 4 1 RESISTOR 47K 5% .25W CF 28480 0683-4735
A1R58 0757-0342 8 1 RESISTOR 100K 1% .25W CF 28480 0757-0342
A1R59 0699-2518 0 1 RESISTOR 267K 1% .25W CF 28480 0699-2518
A1R60 0683-4705 8 1 RESISTOR 47 5% .25W F 28480 0683-4705
A1R61 0683-4705 8 1 RESISTOR 47 5% .25W F 28480 0683-4705
A1R62 0811-3817 4 1 RESISTOR 20K 10% 5W PW 28480 0811-3817
A1R63 0683-3315 4 1 RESISTOR 330 5% .25W CF 28480 0683-3315
A1R64 0683-6825 7 1 RESISTOR 6.8K 5% .25W F 28480 0683-6825
A1R65 0683-6825 7 1 RESISTOR 6.8K 5% .25W F 28480 0683-6825
A1R66 0757-0715 9 1 RESISTOR 150 1% .25W CF 28480 0757-0715
A1R67 0683-3315 4 1 RESISTOR 330 5% .25W CF 28480 0683-3315
A1R68 0683-3315 4 1 RESISTOR 330 5% .25W CF 28480 0683-3315
A1R69 0683-6825 7 1 RESISTOR 6.8K 5% .25W CF 28480 0683-6825
A1R70 0683-6825 7 1 RESISTOR 6.8K 5% .25W CF 28480 0683-6825
A1R71 0757-0715 9 1 RESISTOR 150 1% .25W CF 28480 0757-0715
A1R72 0757-0715 9 1 RESISTOR 150 1% .25W CF 28480 0757-0715
A1R73 0683-4725 2 1 RESISTOR 4.7K 5% .25W CF 28480 0683-4725
A1R74 0757-0715 9 1 RESISTOR 150 1% .25W CF 8480 20757-0715
A175 0757-0760 4 1 RESISTOR 20K 1% .25W CF 28480 0757-0760
A1R76 0757-0497 4 1 RESISTOR 22K 1% .25W CF 28480 0757-0497
A1R77 0757-0497 4 1 RESISTOR 22K 1% .25W CF 28480 0757-0497
A1R78 0757-0497 4 1 RESISTOR 22K 1% .25W CF 2840 0757-0497
A1R79 0757-0497 4 1 RESISTOR 22K 1% .25W CF 28480 0757-0497
A1T1 9100-4744 0 1 CURRENT XFMR 28480 9100-4744
A1T2 9100-4747 3 1 MAIN XFMR 28480 9100-4747
A1T3 9100-4745 1 1 FEEDBACK XFMR 28480 9100-4745
A1T4 9140-1348 8 1 IDCTR-FXD 1.3MH 2.5A 28480 9140-1348
A1T5 9100-4746 2 1 DRVR XFMR 28480 9100-4746
A1T6 9100-4746 2 1 DRVR XFMR 28480 9100-4746
A1TP1 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359

Part Number CD Qty Description Mfr Code Mfr Part

Number

6-6 Chapter6

Replaceable Parts

Introduction

Table 6-1 Al Inverter Board Assembly, Replaceable Parts

Reference
Designation

A1TP2 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP3 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP4 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP5 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP6 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP7 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP8 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP9 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP10 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP11 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP12 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP13 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP14 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP15 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP16 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP17 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP18 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP19 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP20 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP21 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP22 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1TP23 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A1U1 1826-1576 0 1 IC V RGLTR-SWG 16-DIP PKG 28480 1826-1576
A1U2 1820-6080 9 1 IC UC3707 PWR DRIVER 28480 1820-6080
A1U3 1826-1524 8 1 IC MISC 8-DIP-P PKG 28480 1826-1524
A1U4 1820-2922 0 1 IC GATE CMOS NAND QUAD 28480 1820-2922
A1U5 1820-3081 4 1 IC DUAL D FLIP FLOP CMOS NAND 28480 1820-3081
A1U6 1820-3200 9 1 IC CNTR CMOS BIN ASYNCHRO 28480 1820-3200
A1U7 1820-3377 1 1 IC DRVR CMOS PRPHR HI-CUR 28480 1820-3377
A1U8 1826-1411 2 1 IC COMPARATOR PRCN DUAL 8-DIP-P 28480 1826-1411
A1U9 1990-1276 4 1 IC CNY17GFI OPTO ISOLATOR 28480 1990-1276
A1U10 1826-0147 9 1 IC V RGLTR FXD 11.5/12.5 TO-220 28480 1826-0147
A1VR1 1902-0557 7 1 DIODE-ZNR 20V PO=1W 5% 28480 1902-0557
A1VR2 1902-1304 4 1 DIODE-ZNR 15V PO=.4W 5% 28480 1902-1304
A1VR3 1902-1304 4 1 DIODE-ZNR 15V PO=.4W 5% 28480 1902-1304
A1VR4 1902-1304 4 1 DIODE-ZNR 15V PO=.4W 5% 28480 1902-1304
A1VR5 1902-1304 4 1 DIODE-ZNR 15V PO=.4W 5% 28480 1902-1304
A1VR6 1902-1304 4 1 DIODE-ZNR 15V PO=.4W 5% 28480 1902-1304
A1VR7 1902-1304 4 1 DIODE-ZNR 15V PO=.4W 5% 28480 1902-1304
A1Yl 0410-2105 1 1 CLK-OSC-XTAL 1.96608MHZ 28480 0410-2105

Part Number CD Qty Description Mfr Code Mfr Part

Number

Al INVERTER MISCELLANEOUS PARTS
0360-2362 5 1 TERMINAL BLOCK 4-TERMINAL 28480 0360-2362
85901-00015 1 2 TB JUMPER J6-2 28480 85901-00015
85901-80043 3 24 TERMINAL-STUD SGL-TUR 28480 85901-80043

Chapter 6 6-7

Replaceable Parts

Introduction

Table 6-1 Al Inverter Board Assembly, Replaceable Parts

Reference
Designation

Part Number CD Qty Description Mfr Code Mfr Part

Number

85901-20010 8 8 COOL SHEET 28480 85901-20010
85901-00010 6 1 INV. BASE 28480 85901-00010
1990-1130 9 1 LED-LAMP LUM-INT=560UCD 28480 1990-1130
85901-40008 6 8 HOLDER FET 28480 85901-40008
0515-0912 6 6 SCREW-MACH M3X0.5 8MM-LG PH 28480 0515-0912
2190-0584 0 14 WASHER-LK HLCL 3.0MM 28480 2190-0584
3050-0891 7 14 WASHER-FL MTLC 3.0MM 28480 3050-0891
0535-0025 4 8 NUT-HEX DBL-CHAM M3X0.5 2.4MM-TH 28480 0535-0025
85901-80044 4 6 EYELET 28480 85901-80044

6-8 Chapter6

Replaceable Parts

Introduction

Table 6-2. A2 Control Board Assembly, Replaceable Parts

Reference
Designation

A2 85901-60002 2 1 CONTROL BOARD ASSEMBLY 28480 85901-60002
A2B1 9164-0325 9 1 PIEZOELECTRIC SOUNDER 28480 9164-0325
A2C1 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2C2 0180-3469 3 1 CAPACITOR-FXD 100UF 25VDC AL 105C 28480 0180-3469
A2C3 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2C4 0160-3237 1 1 CAPACITOR-FIXED 0.1UF 50VDC CER 20% 28480 0160-3237
A2C5 0160-3237 1 1 CAPACITOR-FXD 0.IUF 50VDC CER 20% 28480 0160-3237
A2C6 0180-0224 2 1 CAPACITOR-FXD 10UF 16VDC AL 105C 28480 0180-0224
A2C7 0160-3237 1 1 CAPACITOR-FXD 0.IUF 50VDC CER 20% 28480 0160-3237
A2C8 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2C9 0180-4110 3 1 CAPACITOR-FXD 2.2UF 50VDC AL 85C 28480 0180-4110
A2C10 0180-3315 2 1 CAPACITOR-FXD 4.7UF 25VDC AL 85C 28480 0180-3315
A2C11 0160-3237 1 1 CAPACITOR-FXD 0.IUF 50VDC CER 20% 28480 0160-3237
A2C12 0160-3237 1 1 CAPACITOR-FXD 0.IUF 50VDC CER 20% 28480 0160-3237
A2C13 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2C14 0160-3237 1 1 CAPICATOR -FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2C15 0160-3237 1 1 CAPICATOR- FXD 0.1UF 50VDC CER 20% 2840 0160-3237
A2C16 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2CI7 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2C18 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A2C19 0160-0263 7 1 CAPACITOR-FXD 0.22UF 50VDC CER 20% 28480 0160-0263
A2CR1 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A2CR2 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A2CR3 1901-0894 3 1 DIODE-SWITCHING 70V 200MA 28480 1901-0894
A2CR4 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A2CR5 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A2CR6 1901-0704 3 1

A2CR7 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A2CR8 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A2CR9 1901-0704 3 1 DIODE-GEN PRP 100V 1A 1N4002GP 28480 1901-0704
A2J1 1251-6527 2 1 CONNECTOR-POST-TP-HDR 6P 28480 1251-6527
A2J2 1251-5066 2 1 CONNECTOR-POST-TP-HDR 2P 28480 1251-5066
A2J3 1251-4938 5 1 CONNECTOR-POST-TP-HDR 2P 28480 1251-4938
A2J4 1251-4381 2 1 CONNECTOR-POST-TP-HDR 7P 28480 1251-4381
A2J5 1251-6527 2 1 CONNECTOR-POST-TP-HDR 6P 28480 1251-6527
A2JP1 1252-2794 9 1 CONNECTOR-JUMPER 2P 28480 1252-2794
A2W1 8151-0013 6 1 WIRE-JUMPER 22AWG 1X22 28480 8151-0013
A2R1 0698-4631 0 1 RESISTOR 1.91K 1% .25W F 28480 0698-4631
A2R2 0698-4703 7 1 RESISTOR 8.66K 1% .25W F 28480 0698-4703
A2R3 0698-4036 9 1 RESISTOR 16.9K 1% .25W F 28480 0698-4036
A2R4 0757-0344 0 1 RESISTOR 1M 1% .25W F 28480 0757-0344
A2R5 0698-4706 0 1 RESISTOR 10.2K 1% .25W F 28480 1215-6527
A2R6 0757-0744 4 1 RESISTOR 3.92K 1% .25W F 28480 0757-0744
A2R7 0757-0740 0 1 RESISTOR 2.21K 1% .25W F 28480 0757-0740
A2R8 0757-0745 5 1 RESISTOR 4.32K 1% .25W F 28480 0757-0745

Part
Number

CD Qty Description Mfr

Code

DIODE-GEN PRP 100V 1A 1N4002GP

Mfr Part
Number

28480 1901-0704

Chapter 6 6-9

Replaceable Parts

Introduction

Table 6-2. A2 Control Board Assembly, Replaceable Parts

Reference
Designation

A2R9 0757-0740 0 1 RESISTOR 2.21K 1% .25W F 28480 0757-0740
A2R10 0683-4735 4 1 RESISTOR 47K 5% .25W F 28480 0683-4735
A2R11 0698-3506 6 1 RESISTOR 470 1% .25W F 28480 0698-3506
A2R12 0757-0743 3 1 RESISTOR 3.32 1% .25W F 28480 0757-0743
A2R13 0757-0885 4 1 RESISTOR 15.4K 1% .25W F 28480 0757-0885
A2R14 2100-2497 9 1 RESISTOR-TRMR 2K 10% 28480 2100-2497
A2R16 0757-0340 6 1 RESISTOR I0K 1% .25W CF 28480 0757-0340
A2R17 0699-2519 1 1 RESISTOR 470K 5% .25W CF 28480 0699-2519
A2R18 0698-4646 7 1 RESISTOR 4.42K 1% .25W F 28480 0698-4646
A2R19 0698-4646 7 1 RESISTOR 4.42K 1% .25W F 28480 0698-4646
A2R20 0757-0344 0 1 RESISTOR 1M 1% .25W F 28480 0757-0344
A2R22 0757-0340 6 1 RESISTOR 10K 1% .25W F 28480 0757-0340
A2R23 0757-0338 2 1 RESISTOR 1K 1% .25W F 28480 0757-0338
A2R24 0698-0746 0 1 RESISTOR 4.75K 1% .25W F 28480 0698-0746
A2R25 0699-1301 7 1 RESISTOR 4.7M 5% .25W F 28480 0699-1301
A2R26 0698-4725 3 1 RESISTOR 19.6K 1% .25W F 28480 0698-4725
A2R28 0698-4739 9 1 RESISTOR 3.83K 1% .25W F 28480 0698-4739
A2R29 0757-0715 9 1 RESISTOR 150 1% .25W CF 28480 0757-0715
A2R30 0757-0757 9 1 RESISTOR 15K 1% .25W CF 28480 0757-0757
A2R31 0698-4708 2 1 RESISTOR 10.7K 1% .25W F 28480 0698-4708
A2R32 0757-0739 7 1 RESISTOR 2K 1% .25W F 28480 0757-0739
A2R33 0757-0344 0 1 RESISTOR 1M 1% .25W F 28480 0757-0344
A2R34 0757-0338 2 1 RESISTOR 1K 1% .25W CF 28480 0757-0338
A2R35 0757-0340 6 1 RESISTOR 10K 1% .25W F 28480 0757-0340
A2R36 0699-2521 5 1 RESISTOR 2.2M 1% .25W F 28480 0699-2521
A2R37 0698-4714 0 1 RESISTOR 13.7K 1% .25W F 28480 0698-4714
A2R38 0698-4646 7 1 RESISTOR 4.42K 1% .25W F 28480 0698-4646
A2R39 0757-0748 8 1 RESISTOR 5.62K 1% .25W F 28480 0757-0748
A2R40 0758-0030 3 1 RESISTOR 510 5% .25W F 28480 0758-0030
A2R41 0758-0030 3 1 RESISTOR 510 5% .25W F 28480 0758-0030
A2R42 0757-0338 2 1 RESISTOR 1K 1% .25W CF 28480 0757-0338
A2R43 0757-0760 4 1 RESISTOR 20K 1% .25W F 28480 0757-0760
A2R45 0757-0340 6 1 RESISTOR 10K 1% .25W CF 28480 0757-0340
A2RT1 0837-0388 2 1 THERMISTOR TUB 5K-OHM 28480 0837-0388
A2TP1 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP2 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP3 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP4 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP5 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP6 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP7 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP8 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP9 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP10 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP11 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359

Part
Number

CD Qty Description Mfr

Code

Mfr Part
Number

6-10 Chapter6

Replaceable Parts

Introduction

Table 6-2. A2 Control Board Assembly, Replaceable Parts

Reference
Designation

A2TP12 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP13 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP14 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP15 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP16 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP17 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP18 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP19 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP20 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP21 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2TP22 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A2U1 1826-0161 7 1 IC OP AMP GP QUAD 14-DIP 28480 1826-0161
A2U2 1820-2922 0 1 IC GATE CMOS NAND QUAD 28480 1820-2922
A2U3 1826-0161 7 1 IC OP AMP GP QUAD 14-DIP 28480 1826-0161
A2U41 1820-2924 2 1 IC GATE CMOS NOR QUAD 28480 820-2924
A2U5 1820-2923 1 1 IC GATE CMOS NAND TPL 28480 1820-2923
A2U6 1820-2922 0 1 IC GATE CMOS NAND QUAD 28480 1820-2922
A2U7 1826-1624 9 1 IC OP AMP GP DUAL 8-DIP-P PKG 28480 1826-1624
A2U8 1826-0161 7 1 IC OP AMP GP QUAD 14-DIP 28480 1826-0161
A2U9 1826-1115 3 1 IC V RGLTR-V-REF-ADJ TO-92 28480 1826-1115
A2U10 1826-01446 6 1 IC V RGLTR-FXT-POS 4.8/5.2V 28480 1826-0144

Part
Number

CD Qty Description Mfr

Code

Mfr Part
Number

Chapter 6 6-11

Replaceable Parts

Introduction

Table 6-3. A3, AS, and A23 Board Assemblies, Replaceable Parts

Reference
Designation

A3 85901-60003 3 1 CHARGER BOARD ASSEMBLY 28480 85901-60003
A3C1 0160-7049 1 1 CAPACITOR-FXD 4700PF 250VAC Y 28480 0160-7049
A3C2 0160-7049 1 1 CAPACITOR-FXD 4700PF 250VAC Y 28480 0160-7049
A3C3 0160-4259 9 1 CAPACITOR-FXD 0.22UF 250VAC X 28480 0160-4259
A3C4 0160-7075 3 1 CAPACITOR-FXD 4700PF 50VDC PP 2% 28480 0160-7075
A3C5 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 28480 0160-3237
A3C6 0180-3737 8 1 CAPACITOR-FXD 1UF 50VDC AL 85C 28480 0180-3737
A3C7 0160-0263 7 1 CAPACITOR-FXD 0.22UF 50VDC CER 20% 28480 0160-0263
A3C8 0180-3705 0 1 CAPACITOR-FXD 47UF 50VDC AL 105C 28480 0180-3705
A3C9 0160-3752 5 1 CAPACITOR-FXD 1000PF 50VDC CER 10% 28480 0160-3752
A3C10 0180-4106 7 1 CAPACITOR-FXD 390UF 250VDC AL 105C 28480 0180-4106
A3C11 0180-4106 7 1 CAPACITOR-FXD 390UF 250VDC AL 105C 28480 0180-4106
A3C12 0160-7076 4 1 CAPACITOR-FXD 0.033UF 630VDC MPE 28480 0160-7076
A3C13 0160-3237 1 1 CAPACITOR-FXD 0.1UF 50VDC CER 20% 28480 0160-3237
A3C14 0160-7049 1 1 CAPACITOR-FXD 4700PF 250VAC Y 28480 0160-7049
A3C15 0180-4107 8 1 CAPACITOR-FXD 2800UF 25VDC AL 105C 28480 0180-4107
A3C16 0180-4108 9 1 CAPACITOR-FXD 220UF 25VDC AL 105C 28480 0180-4108
A3C17 0160-3237 1 1 CAPACITOR-FXD 0.IUF 50VDC CER 20% 28480 0160-3237
A3C18 0160-4259 9 1 CAPACITOR-FXD 0.22UF 250VAC X 28480 0160-4259
A3C19 0160-7049 1 1 CAPACITOR-FXD 4700PF 250VAC Y 28480 0160-7049
A3C20 0160-7085 5 1 CAPACITOR-FXD 470PF 50VDC CER 20% 28480 0160-7085
A3C21 0160-0263 7 1 CAPACITOR-FXD 0.22UF 50VDC CER 20% 28480 0160-0263
A3C22 0160-7086 6 1 CAPACITOR-FXD 270PF 1000VDC CER 20% 28480 0160-7086
A3C23 0160-3831 1 1 CAPACITOR-FXO 0.01UF 50VDC CER 20% 28480 0160-3831
A3CR1 1901-0646 3 1 DIODE-PWR RECT 200V 1A 150NS 28480 1901-0646
A3CR2 1901-0646 3 1 DIODE-PWR RECT 200V 1A 150NS 28480 1901-0646
A3CR3 1906-0356 2 1 DIODE-FW BRDG 800V 3A 28480 1906-0356
A3CR4 1901-1274 5 1 DIODE-GEN PRF 28480 1901-1274
A3CR5 1906-0321 1 1 DIODE-CT-RECT 200V 16A 28480 1906-0321
A3CR6 1906-0357 3 1 DIODE-CT-RECT 100V 16A 28480 1906-0357
A3FL1 9135-0364 5 1 LINE FILTER 40MH 28480 9135-0364
A3J1 1252-2786 9 1 CONNECTOR-POST-TP-HDR 2P 28480 1252-2786
A3J2 1252-2786 9 1 COMMECTOR-POST-TP-HDR 2P 28480 1252-2786
A3J3 1251-6527 2 1 CONNECTOR-POST-TP-HDR 6P 28480 1251-6527
A3J4 1251-4938 5 1 CONNECTOR-POST--HDR 3P 28480 1251-4938
A3L1 9140-1349 9 1 CHOKE COIL 30UH 4A 28480 9140-1349
A3Q1 1854-0210 6 1 TR NPN SI TO-18 28480 1854-0210
A3Q2 1884-0336 0 1 THYR-2N5064 SCR 28480 1884-0336
A3Q3 1855-0766 6 9 1TR MOSFET N-CHAN E-MODE TO-220 28480 1855-0766
A3R1 0811-3813 0 1 RESISTOR 22K 5% 10W PW 28480 0811-3813
A3R2 0683-8245 9 1 RESISTOR 820K 5% .25W CF 28480 0683-8245
A3R3 0689-1845 3 1 RESISTOR 180K 5% .25W CF 28480 0689-1845
A3R4 0698-4712 8 1 RESISTOR 12.4K 1% .25W CF 28480 0698-4712
A3R5 0683-2215 1 1 RESISTOR 220 5% .25W CF 28480 0683-2215
A3R6 0683-3925 2 1 RESISTOR 3.9K 5% .25W CF 28480 0683-3925

Part
Number

C D Qty Description Mfr Code Mfr Part

Number

6-12 Chapter6

Replaceable Parts

Introduction

Table 6-3. A3, AS, and A23 Board Assemblies, Replaceable Parts

Reference
Designation

A3R7 0757-0340 6 1 REGISTOR 10K 1% .25W CF 28480 0757-0340
A3R8 0757-0340 6 1 RESISTOR 10K 1% .25W CF 28480 0757-0340
A3R9 0811-3812 9 1 RESISTOR 100 5% 3W 28480 0811-3812
A3R10 0683-4725 2 1 RESISTOR 4.7K 5% .25W CF 28480 0683-4725
A3R11 0811-3815 2 1 RESISTOR 6.8K 5% 10W PW 28480 0811-3815
A3R12 0698-3506 6 1 RESISTOR 470 1% .25W CF 28480 0698-3506
A3R13 0757-0338 2 1 RESISTOR 1K 1% .25W CF 28480 0757-0338
A3R14 0757-0340 6 1 RESISTOR 10K 1% .25W CF 28480 0757-0340
A3R15 0699-2519 1 1 RESISTOR 470K 5% .5W CF 28480 0699-2519
A3R16 0699-2519 1 1 RESISTOR 470K 5% .5W CF 28480 0699-2519
A3R17 0699-2534 0 1 RESISTOR 0.03 5% .5W 28480 0699-2534
A3R18 0698-3506 6 1 RESISTOR 470 1% .25W CF 28480 10698-3506
A3R19 0698-3506 6 1 RESISTOR 470 1% .25W CF 28480 0698-3506
A3R20 0757-1027 8 1 RESISTOR 680 1% .25W CF 28480 0757-1027
A3R21 0757-0743 3 1 RESISTOR 3.32K 1% .25W CF 28480 0757-0743
A3R22 0699-2520 4 1 RESISTOR 462 1% .25W CF 28480 0699-2520
A3R23 0698-7810 3 1 RESISTOR 2.05K 1% .25W CF 28480 0698-7810
A3R24 2100-2497 9 1 RESISTOR-TRMR 2K 10% 28480 2100-2497
A3R25 0757-0354 2 1 RESISTOR 3.65K 1% .25W F 28480 0757-0354
A3R26 0757-0340 6 1 RESISTOR 10K 1% .25W CF 28480 0757-0340
A3R27 0757-0354 2 1 RESISTOR 3.65K 1% .25W TF 28480 0757-0354
A3RT1 0837-0389 3 1 THERMISTOR S1100 28480 0837-0389
A3RT2 0837-0388 2 1 THERMISTOR TUB 5K-OHM 28480 0837-0388
A3T1 9100-4748 4 4 XFMR POWER 28480 9100-4748
A3TP1 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP2 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP3 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP4 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP5 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP6 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP7 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP8 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP9 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP10 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP11 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3TP12 0360-2359 0 1 CONNECTOR-SGL CONT 28480 0360-2359
A3U1 1826-1908 2 1 IC V RGLTR-SWG 28480 1826-1908
A3U2 1990-1276 4 1 IC OPTO-ISOLATOR 28480 1990-1276
A3U3 1990-1276 4 1 IC OPTO-ISOLATOR 28480 1990-1276
A3U4 1826-1115 3 1 IC V RGLTR-V-REF-ADJ TO-92 28480 1826-1115

Part
Number

C D Qty Description Mfr Code Mfr Part

Number

A3 MISCELLANEOUS PARTS
85901-40008 6 3 HOLDER-FET 28480 85901-40008
0535-0025 4 3 NUT-HEX OBL-CHAM M3-0.5 28480 0535-0025
85901-00014 0 1 CHRGR-BASE 28480 85901-00014

Chapter 6 6-13

Replaceable Parts

Introduction

Table 6-3. A3, AS, and A23 Board Assemblies, Replaceable Parts

Reference
Designation

A5 85901-60005 5 1 TERMINAL BLOCK BOARD ASSEMBLY 28480 85901-60005
A5C1 0160-7050 4 1 CAPACITOR-FXD 4700PF 100V 28480 0160-7050
A5C2 0160-7048 0 1 CAPACITOR-FXD 2200PF 100V 28480 0160-7048
A5C3 0160-7050 4 1 CAPACITOR-FXD 4700PF 100V 28480 0160-7050
A5C4 0160-7048 0 1 CAPACITOR-FXD 2200PF 100V 28480 0160-7048
A5C5 0160-7050 4 1 CAPACITOR-FXD 4700PF 100V 28480 0160-7050
A5C6 0160-7048 0 1 CAPACITOR-FXO 2200PF 100V 28480 0160-7048

A23 85901-60006 6 1 DC FILTER BOARD ASSEMBLY 28480 85901-60006
A23C1 0160-7048 0 1 CAPACITOR-FXD 2200PF 100V 28480 0160-7048
A23C2 0160-7050 4 1 CAPACITOR-FXD 4700PF 100V 28480 0160-7050
A23C3 0160-7048 0 1 CAPACITOR-FXD 2200PF 100V 28480 0160-7048
A23C4 0160-7050 4 1 CAPACITOR-FXD 4700PF 100V 28480 0160-7050
A23C5 0160-7050 4 1 CAPACITOR-FXD 4700PF 100V 28480 0160-7050
A23C6 0160-7048 0 1 CAPACITOR-FXD 2200PF 100V 28480 0160-7048

Part
Number

0515-0912 6 4 SCREW-MACH M3X0.5 8MM-LG PAN-HD 28480 0515-0912
2190-0584 0 7 WASHER-LK HLCL 3.0MM 28480 2190-0584
3050-0891 7 7 WASHER-LK MTLC 3.0MM 28480 3050-0891
1252-2794 9 1 CONN-JUMPER 2P 28480 1252-2794

C D Qty Description Mfr Code Mfr Part

Number

6-14 Chapter6

Table 6-4. 85901A Miscellaneous Replaceable Parts

Replaceable Parts

Introduction

Reference
Designation

Part Number CDQty Description Mfr Code Mfr Part

Number

INSTRUMENT COVER ASSEMBLY
5041-7288 3 2 FOOT REAR 28480 5041-7288
85901-80005 7 2 SPACER FOOT 28480 85901-80005
5021-6332 4 2 PLATE HANDLE 28480 5021-6332
5021-8728 6 2 PLATE BACK-UP 28480 5021-8728
85901-80053 5 1 HANDLE 28480 85901-80053
5021-6344 8 2 SOCKET GEAR 28480 5021-6344
5021-6343 7 2 GEAR RING 28480 5021-6343
1460-2164 8 2 SPRING HANDLE 28480 1460-2164
5041-3991 7 2 CAP TRIM HANDLE 28480 5041-3991
0515-0926 2 6 SCREW-MACH M4X0.7 10MM-LG PAN-HD 28480 0515-0926
0515-0913 7 6 SCREW-MACH M4X0.7 10MM-LG FLH-HD 28480 0515-0913
0515-1021 0 2 SCREW-MACH M5X0.8 16MM-LG FLH-HD 28480 0515-1021
2190-0586 2 2 WSHR-LK HLCL 4.0MM 28480 2190-0586

BATTERY TERMINAL ASSEMBLY
85901-80039 7 2 TERMINAL BATTERY 28480 85901-80039
85901-80042 2 2 PLATE NUT 28480 85901-80042
0515-1012 9 2 SCREW-MACH M4X0.7 8MM LG FLH 28480 0515-1012

85901-90001 4 1 MANUAL 28480 85901-90001
2110-0665 0 1 FUSE 1A 125V 28480 2110-0665
2110-0773 1 1 FUSE 1.6A 250V TO IEC 28480 2110-0773
2110-0734 4 1 FUSE 4A 250V TO IEC 28480 2110-0734
2110-0809 4 2 FUSE 30A 32V 28480 2110-0809
0360-2365 8 1 TB JUMPER J8-2 28480 0360-2365
0360-2364 7 1 TB JUMPER J8-4 28480 0360-2364
85901-60100 1 1 CHARGER-CONTROL HARNESS ASSEMBLY 28480 85901-60100
85901-60101 2 1 INDICATOR HARNESS ASSEMBLY 28480 85901-60101
85901-60103 4 1 INVERTER-CONTROL HARNESS ASSEMBLY 28480 85901-60103
85901-60104 5 1 CHARGER OUTPUT HARNESS ASSEMBLY 28480 85901-60104
85901-60108 9 1 INVERTER DC INPUT HARNESS ASSEMBLY

"A"
85901-60109 0 1 INVERTER OC INPUT HARNESS ASSEMBLY

"B"
3101-3000 5 1 SW-RKR DPST 4A 250V (WHT) 28480 3101-3000
1390-0088 2 1 RETAINER FASTENER 28480 1390-0088
1390-0818 6 1 STUD FASTENER 28480 1390-0818
1390-0071 3 1 WSHR WEAR FASTENER 28480 1390-0071

28480 85901-60108

28480 85901-60109

FRONT FRAME ASSEMBLY
1390-0293 1 1 EJECTOR SPRING 28480 1390-0293
85901-40002 0 1 DOOR 28480 85901-40002
85901-40003 1 1 FRONT FRAME 28480 85901-40003
85901-80007 9 1 PANEL DRESS 28480 85901-80007

Chapter 6 6-15

Replaceable Parts

Introduction

Table 6-4. 85901A Miscellaneous Replaceable Parts

Reference
Designation

DS2 1990-1129 6 1 LED-LAMP LUM-INT=900UCD 28480 1990-1129
DS1 1990-1130 9 1 LED-LAMP LUM-INT=560UCD 28480 1990-1130
DS3 1990-1130 9 1 LED-LAMP LUM-INT=560UCD 28480 1990-1130

Part Number CDQty Description Mfr Code Mfr Part

Number

5041-7289 4 4 BUMPER 28480 5041-7289
85901-40007 5 1 PLATE HINGE 28480 85901-40007
85901-80018 2 2 PIVOT PIN 28480 85901-80018
85901-80041 1 1 PAD DOOR 28480 85901-80041
0515-0924 0 8 SCREW-MACH M3X0.5 6MM-LG PAN-HD 28480 0515-0924
0515-0910 4 2 SCREW-MACH M4X0.7 8MM-LG PAN-HD 28480 0515-0910
0515-0912 6 23 SCREW-MACH M3X0.5 8MM-LG PAN-HD 28480 0515-0912
3050-1313 0 2 NYLON WASHER ID5.2X0D9.5MM 0.8TH 28480 3050-1313
2190-0586 2 2 WASHER-LK HLCL 4.0MM 28480 2190-0586
3050-0891 7 3 WSHR-FL MTLC 3.0MM 28480 3050-0891
2190-0584 0 11 WSHR-LK HLCL 3.0MM 28480 2190-0584

PCB INDICATOR BOARD ASSEMBLY

1252-0040 4 1 CONNECTOR-POST-TP-HDR 4P 28480 1252-0040

85901-60112 5 1 SELECTOR SW HARNESS ASSEMBLY 28480 85901-60112
85901-60121 6 1 INVERTER OUTPUT HARNESS ASSEMBLY 28480 85901-60121
85901-60106 7 1 INTER IN HARNESS ASSEMBLY 28480 85901-60106
85901-60105 6 1 BATT (-) HARNESS ASSEMBLY 28480 85901-60105

85901-60102 3 1 CHARGER IN HARNESS ASSEMBLY 28480 85901-60102
85901-60118 1 1 EXT IN HARNESS ASSEMBLY 28480 85901-60118
85901-40005 3 1 REAR FRAME 28480 85901-40005
85901-00002 6 1 REAR PANEL 28480 85901-00002
9135-0367 8 1 CONNECTOR-AC PWR INLET MALE REC 28480 9135-0367
0590-1661 2 4 THREAD-IN M5X0.8 7.5MM-LG 28480 0590-1661
3101-2999 9 1 SW RKR DPST 4A 250V(BLK) 28480 3101-2999
1252-2772 3 1 CONNECTOR-AC PWR OUTLET CEE-22 28480 1252-2772
9135-0365 6 1 NOISE FILTER 28480 9135-0365

85901-00003 7 1 MAIN DECK 28480 85901-00003
85901-40006 4 2 SIDE FRAME 28480 85901-40006
2190-0584 0 22 WASHER-LK HLCL 3.0MM 28480 2190-0584
0515-1012 9 8 SCREW-MACH M4X0.7 8MM-LG FLH-HD 28480 0515-1011
0400-0325 2 0.3 GRO-CHANNEL NOTCHED 28480 0400-0325
0515-0926 2 4 SCREW-MACH M4X0.7 10MM-LG PAN-HD 28480 0515-0926
2190-0586 2 4 WSHR-LK HLCL 4.0MM 28480 2190-0586
3050-0891 7 10 WSHR-FL MTLC 3.0MM 28480 3050-0891
0535-0025 4 2 NUT-HEX DBL-CHAM M3X0.5 28480 0535-0025
85901-80045 5 1 PLATE CHOKE 28480 85901-80045
85901-80046 6 2 SPACER 28480 85901-80046
0460-2198 7 0.5 TAPE INSULATION 28480 0460-2198

6-16 Chapter6

Table 6-4. 85901A Miscellaneous Replaceable Parts

Replaceable Parts

Introduction

Reference
Designation

Part Number CDQty Description Mfr Code Mfr Part

Number

1400-1501 9 11 MOUNTING BLOCK CABLE 28480 1400-1501

85901-60107 8 1 THERMISTOR HARNESS ASSEMBLY 28480 85901-60107

BATTERY CAGE ASSEMBLY
85901-00005 9 1 CAGE BATTERY 28480 85901-00005
85901-00006 0 1 BRACKET, WIRE 28480 85901-00006
85901-20007 3 1 SHAFT ROLLER 28480 85901-20007
85901-20011 9 1 SHAFT HINGE 28480 85901-20011
85901-80006 8 1 EXTRACTOR, STRAP 28480 85901-80006
85901-00008 2 1 BRACKET BATTERY 28480 85901-00008
85901-80011 5 1 PAD BRACKET 28480 85901-80011
0510-1322 4 2 E-RETAINER 4MM 28480 0510-1322
0510-1321 3 2 E-RETAINER 8MM 28480 0510-1321
0515-0912 6 6 SCREW-MACH M3X0.5 8MM-LG PAN-HD 28480 0515-0912
2190-0584 0 6 WSHR-LK HLCL 3.0MM 28480 2190-0584
85901-20008 4 1 ROLLER EXTRACTING 28480 85901-20008
3050-1313 0 3 WASHER-NYLON ID5.2X0D10MM 28480 3050-1313
85901-00007 1 1 BRACKET THERMISTOR 28480 85901-00007
0510-1323 5 1 E-RETAINER 6MM 28480 0510-1323

2110-0811 8 1 FUSE HLDR 4A 250V 28480 2110-0811
0535-0023 2 8 NUT-HEX DBL-CHAM M4X0.7 28480 0535-0023
2190-0586 2 6 WSHR-LK HLCL 4.0MM 28480 2190-0586
3050-0893 9 1 WSHR-FL MTLC 4.0MM 28480 3050-0893
0515-1005 0 7 SCREW-MACH M3X0.5 10MM-LG FLH 28480 10515-1005
0535-0025 4 7 NUT-HEX DBL-CHAM M3X0.5 28480 0535-0025
3050-0891 7 7 WSHR-FL MTLC 3.0MM 28480 3050-0891
2190-0584 0 7 WASHER-LK HLCL 3.0MM 28480 2190-0584
0890-0312 4 0.24 TUBING-HS .25-IN-D/.125-IN-RCVD 28480 0890-0312
0515-0913 7 1 SCREW-MACH M4X0.7 10MM LG FLH 28480 0515-0913
3101-3001 6 11 SW-SL DPDT 5A 250V 28480 3101-3001

85901-80013 7 1 LABEL WARNING 28480 85901-80013
85901-80049 9 2 LABEL WARNING HIGH VOLTAGE 28480 85901-80049
0515-1218 7 4 SCR-SKD-HD-CAP M5X0.8 40MM-GL 28480 0515-1218
0900-0024 8 4 O-RING 28480 0900-0024
2190-0587 3 4 WSHR-LK HLCL 5.0MM 5.1-MM-ID 28480 2190-0587

1420-0373 3 1 BATTERY, MATSUSHITA ELECTRIC LCR

12V17P

28480 1420-0373

Chapter 6 6-17

Replaceable Parts

Introduction

Figure 6-1 85901A Overall Subassembly Locations (1 of 2)

6-18 Chapter6

Item Part Number Qty Description

1 85901-60207 1 ASS'Y-COVER
2 85901-60208 1 ASS'Y-FRONT FRAME
3 85901-60210 1 ASS'Y-MAIN DECK
4 85901-60209 1 ASS'Y-REAR FRAME
5 0535-0025 2 NUT-HEX DBL-CHAM M3XO.5
6 2190-0584 2 WSHR-LK HLCL 3.0MM
7 0515-0913 8 SCR-MACH M4XO.7 10MM FH
8 0515-1218 4 SCR-SKD-HD-CAP M5XO.8 40MM
9 2190-0587 4 WSHR-LK HLCC 5.0MM
10 0900-0024 4 O-RING

Figure 6-1. 85901A Overall Subassembly Locations (2 of 2)

Replaceable Parts

Introduction

Chapter 6 6-19

Replaceable Parts

Introduction

Figure 6-2 85901A Subassembly Locations, Top and Bottom Views (1 of 3)

6-20 Chapter6

Replaceable Parts

Introduction

Figure 6-3 85901A Subassembly Locations, Top and Bottom Views (2 of 3)

Chapter 6 6-21

Replaceable Parts

Introduction

Item Part Number Qty Description

1 85901-40006 2 FRAME-SIDE
2 0515-1012 8 SCR-MACH M4XO.7 8MM FH
3 0515-0912 30 SCR-MACH M3XO.5 8MM PH
4 2190-0584 30 WSHR-LK HLCL 3.0MM
5 85901-00003 1 DECK-MAIN
6 85901-60003 1 ASS'Y-CHARGER BOARD
7 85901-60212 1 ASS'Y-BATTERY CAGE
8 85901-60001 1 ASS'Y-INVERTER BOARD
9 0515-0926 4 SCR-MACH M4XO.7 10MM PH
10 2190-0586 4 WSHR-LK HLCL 4.0MM
11 85901-60002 1 ASS'Y-CONTROL BOARD
12 3590-0891 20 WSHR-FL MTLC 3.0MM
13 85901-80045 1 PLATE-CHOKE
14 85901-60108 1 ASS'Y-"A" INV. DC INPUT
15 85901-80046 2 SPACER
16 85901-60006 1 ASS'Y-DC FILTER BOARD

Figure 6-2. 85901A Subassembly Locations, Top and Bottom Views
(3 of 3)

6-22 Chapter6

7 Service

7-1

Service

Introduction

Introduction

This chapter provides circuit descriptions, component location
drawings, and schematics for the 85901A AC Power Source.

Test equipment and accessories required to maintain the 85901A are
listed in Table 1-3. If the equipment listed is not available, equipment
that meets the minimum specifications shown may be substituted.

Overall Description

The 85901A is a portable ac power source. It can be operated on the
bench or as a portable powersupplyfor field service. It may also be used
for measurements requiring power-line isolation or for measurements
performed during power failure. The instrument has a carrying handle
that can also be used as an adjustable tilt-stand. The handle can be
moved by pushing the sides of the handle in and then turning the
handle to a suitable position.

The 85901A consists of battery, inverter, charger, and control circuits. It
provides up to 200W maximum continuous power with the internal
battery, at either 115 Vrms or 230 Vrms. For an overview of major
circuits and their functions, refer to the overall block diagram in Figure
7-1.

The 85901A weighs 14.2 kg (31.3 lb) with the battery installed, and

8.0 kg (17.6 lb) without the battery. The rear panel has terminals for
connecting an external battery or other 12 Vdc source. The dimensions
of the package are 337 mm wide by 125 mm high by 461 mm deep.

7-2 Chapter 7

Figure 7-1 85901A AC Power Source, Overall Block Diagram

Service

Overall Description

Chapter 7 7-3

Service

Front-Panel Description

Front-Panel Description

LED indicators, which represent the status of battery, inverter, and
charger circuits, are located on the left-hand side of the front panel.

The battery function area has two LEDs: the yellow LED indicates
whether the charger is on or off, and the red LED indicates the state of
the battery charger circuit. When the charger is operating, the red LED
will be on if the battery- charging current is greater than 0.45 0.15 A,
and it will be off if the battery-charging current is less than 0.45 0.15 A.

The inverter function area includes a yellow LED and the inverter
on/off switch. The LED should be on when the inverter switch is on and
the inverter is operating, and it will be off when the inverter is not
operating. The inverter will not operate while the battery charger is
operating.

During inverter operation, the red LED in the battery function area
also is used to indicate the stateofthe battery output voltage. When the
inverter is operating, the red LED will be off when battery voltage is
greater than 10.8V typical, and it will blink (accompanied by a buzzer)
when battery voltage is less than 10.8V typical.

The battery door occupies the remaining part of the front panel. This
door provides battery access for service.

Rear-Panel Description

The charger on/off switch is in the upper left-hand corner of the rear
panel. A yellow LED that indicates whether the charger is on or off is
located in the front-panel battery function area. The charger-input line
module is mounted directly below the charger switch. The line module
contains the 1.6A 250V charger input fuse.

The inverter voltage selection switch, two CEE-22V receptacles, and 4A
250V inverter output fuse are grouped together by the INV OUTPUT
bracket. The voltageselection switch sets the inverter output to 115V or
230V.

The internal battery fuse and external battery fuse, both 30A 32 Vdc,
are located above the inverter output receptacles.

The battery-selection terminal block occupies the upper right-hand half
of the rear panel. Select the internal or an external battery by changing
the position of the shorting bars on the terminal block. The external
battery positive and negative leads are connected to the terminals
marked plus and minus, respectively.

7-4 Chapter 7

Inverter

The inverter has two major functional blocks, a dc-to-dc converter and a
dc-to-ac switcher, which are illustrated in Figure 7-2. The inverter also
includes controland protection circuits. The dc-to-dc converterproduces
135 Vdc and 270 Vdc from 12 Vdc input. Either output, 135 Vdc or
270 Vdc, is selected by the rear-panel INV OUTPUT voltage selector
switch.

Figure 7-2 A1 Inverter Board Assembly, Simplified Block Diagram

Service

Inverter

DC-to-DC Converter

The dc-to-dc converter uses four IGFETs in push-pull current mode
driving transformer T2, transforming 12 Vdc input to 135 Vdc or
270 Vdc output. Figure 7-3 shows the circuit in greater detail.

Current-mode control using two control loops is illustrated in
Figure 7-4. For simplicity, only half of the push-pull configuration is
shown. When the switching transistor is on, current through the
primary winding of T2 is proportional to the upward-ramping
filter-inductor current. When the ramp voltage Vs, also proportional to
the filter inductor current, reaches the level of Ve, the switching
transistor turns off. Ve is the amplified output-error voltage. Thus the
outer voltage control loop defines the level at which the inner loop
regulates peak current through the switching IGFET and the filter
inductor.

Chapter 7 7-5

Service

Inverter

Figure 7-3 DC-to-DC Converter Board Assembly, Block Diagram

7-6 Chapter 7

Figure 7-4 Current Control of Switching Power Supply

Service

Inverter

Chapter 7 7-7

Service

Inverter

Inverter Circuit Operation

The dc input is selected from either the internal or external battery by
the position of the wide (four-terminal) jumper located on the
rear-panel terminal block. This dc input (12V) is fed through T1 (C.T.,
the current transformer) to the main transformer T2 and the switching
IGFETs. The dc input is switched on and off at a 100 kHz rate by the
FET Switching circuitry, producing the 135V/270V output at the
secondary of T2. This high voltage is then rectified and filtered to
produce the 135/270 Vdc outputs of the inverter.

The 135V dc output is sampled and fed to the voltage feedback circuit.
The voltage feedback circuit generates an amplitude-modulated carrier
signal of approximately 1 MHz. This feedback signal is transmitted to
the primary side of T2 by the feedback transformer T3, where it is
peak-detected and applied to the pulse-width modulator (PWM) circuit
as a voltage feedback signal. The PWM circuit compares the feedback
signal with the reference signal, which is the current ramp sampled
from the primary switching current through T1. When the level of the
current feedback signal reaches the level of the voltage feedback signal,
the turn-on pulse to the IGFET switching circuit is terminated, which
completes one IGFET switching cycle.

When the output voltage goes below the preset level, due to an output
overload or short circuit, the output voltage monitor circuit sends a
shut-down signal through opto-coupler U9.

When the dc input voltage is higher than 15V, FET Driver A1U2 is
disabled. This is done by R14, R15 divider, and the internal comparator
of U2. The comparator includes an internal offset of 0.3V. U2 pins 9 and
10 are differential inputs of this comparator.

When the input dc voltage is higher than 20V, SCR A1Q1 is triggered
and blows the 30A input fuse. When the input dc voltage polarity is
reversed, diodes A1CR1 and A1CR2 cause the fuse to blow.

DC-to-AC Switcher

As shown in Figure 7-5, the dc-to-ac switcher is composed of two
functional blocks: a full-wave bridge circuit with FET switches, and a
60 Hz quartz oscillator FET driver circuit.

7-8 Chapter 7

Figure 7-5 DC-toAC Switcher Board Assembly, Block Diagram

Service

Inverter

In the 60 Hz oscillator circuit, a 1.96608 MHz quartz crystal is divided
down to 60 Hz. This 60 Hz frequency switches each FET in the
full-wave bridge circuit on and off to produce the ac output. The ac
output waveform is a stepped square-wave with dead time, as
illustrated in Figure 7-6.

Figure 7-6 A1 Inverter Output Waveform

Chapter 7 7-9

Service

Charger Introduction

Charger Introduction

The charger restores the internal battery (energy) charge level. The
charger also powers the control circuits and prevents the inverter from
operating during battery charging.

Charger Block Diagram Overview

Charger-circuit function blocks and interconnections are shown in
Figure 7-7.

Power flows from the ac mains at the left through the circuit functions
to the output terminals at the right. Control circuits (not shown) can
disable the charger through the shut-off signal
abnormal conditions are sensed on either the charger circuit or the
internal battery.

The ac mains input voltage, 90 to 250 Vac, is passed through the line
filter to full-wave bridge rectifier package CR3. The rectified dc is
filtered by C10 and C11, then passed to the primary of T1 and FET
switch Q3. FET switch Q3 is turned on and off by U1, thus controlling
current flow in T1. Flyback control circuit U1 samples the output of T1
auxiliary winding, then varies the on and off time of FET switch Q3 to
regulate battery charging voltage and/or current.

CHRG-SO when

The power transformer stores energy in its magnetic field while current
flows in its primary. When Q3 is turned off, the current of T1 reverses
trying to maintain the field. However, since Q3 is turned off the current
must flow through catch diode CR4. The primary energy in T1 is
transferred to the secondary by the switching primary current.

The CV (constant voltage) feedback amplifier block, below the output
rectifier block, shows how the output voltage is regulated during CV
mode of operation. The output voltage, monitored before output
protection diode CR6, is compared with reference voltage from U4, CV
feedback amplifier. This produces the error-feedback signal. The CV
error signal is fed to flyback control circuit U1 pin 1 through
opto-coupler U3 and R6.

The charger shut-off signal,
control board. This signal is routed through opto-coupler U2, SCR Q2,
and transistor Q1 to U1 pin 3. When U1 pin 3 is held below 1V, U1
turns off the charger until either the
power switch is turned off and on.

The third or auxiliary winding of power transformer T1 provides power
for the primary flyback-control circuitry of U1. It also provides a zero
transit signal for U1 to detect whether the secondary current of T1 is
turned on or off.

CHRG-SO, comes from A2U2 pin 11 on the

CHRG-SO signal goes away or the

7-10 Chapter 7

Figure 7-7 A3 Charger Board Assembly, Block Diagram

Service

Charger Introduction

Chapter 7 7-11

Service

Charger Introduction

Flyback Control Circuit

The heart of the flyback control circuit is A3U1 (TDA4605), an
integrated circuit for controlling free-running flyback converters. It has
four different modes of operation: no load, normal, overload, and burst.

• In no-load operation mode, U1 oscillates at its resonant
frequency, typically 100 to 200 kHz. The resonant frequency of U1
is determined by the inductance of the primary winding of T1 and
the drain to source capacitance of Q3. The output voltage may be
slightly above normal in this mode.

• In normal operation mode, the switching frequency decreases as
the load increases and the mains voltage drops.

• When subjected to an overload in overload operation mode
(power-limited operation), the energy transferred from the
primary to secondary of T1 per operation cycle of U1 is limited by
external components.

• U1 operates in burst mode if the output is short-circuited or
subjected to a very heavy load. U1 moves into burst mode when
the dc input voltage at A3TP2, divided across A3R2 and A3R4, is
lower than 1.0 Vdc. This activates the undervoltage protection
circuit in U1, driving it into burst mode.

When the charger is turned on, U1 starts switching. To start U1, A3C8
charges through A3R1. When the voltage across A3C8 reaches 12 Vdc,
U1 will start switching. During start-up, the energy stored in A3C8 is
used as the supply voltage for U1. Once a steady state has been
reached, U1 receives its power from the auxiliary winding of T1 and
rectifier A3CR1.

Normal Operation

When the battery voltage is near full-charge voltage, the charger
operates in normal operation mode.

In normal operation, A3U1 turns A3Q3 on and off to regulate the
output voltage. If the output load is increased, the output voltage goes
down and the voltage at A3TP11 rises, causing less current through the
cathode of A3U4. This reduces current through opto-coupler A3U2, the
parallel-connected A3U2 and A3R7, and decreases the voltage at A3U1
pin 1. Finally, the regulation amplifier in A3U1 widens the on-pulse to
A3Q3 to transfer more power to the secondary circuit. Current flows
longer in the secondary of T1, increasing the period of current
conduction in the secondary winding of T1. Thus the switching
frequency goes down.

7-12 Chapter 7

Service

Charger Introduction

When A3Q3 is turned off, the energy stored in the emf reverses the
current in the primary winding of T1. This energy is absorbed by
snubber circuit A3R11 and A3C12 and catch diode A3CR4, which
prevents arcing across FET switch A3Q3.

A3Q3 is turned on when A3U1 senses the voltage of A3TP6 has gone to
zero (i.e., there is no current in the secondary winding of transformer
T1). Because of the time delay between the moment A3U1 detects zero
transit of the secondary and the moment A3Q3 is turned on, there is a
small time interval when no current flows in either the primary or
secondary of T1. This zero transit guarantees that the current in T1's
primary winding starts at zero, which helps prevent saturating the
power transformer T1.

Power-Limited Operation

When the battery voltage is approximately 10% less than full- charge
voltage, the charger operates in power-limited mode (i.e., overload
operation).

During the off-time of A3Q3, primary current amplifier of A3U1 holds
the voltage across A3C4 at 1.0 Vdc, but allows this voltage to change
when A3Q3 turns on. After A3Q3 turns on, the primary current of T1
rises. This current increase is dependent on primary inductance and
input dc voltage. The voltage across A3C4 also rises (depending on the
time constant of A3C4, A3R3 and the input dc voltage), and is
proportional to the primary current of T1. As the load is further
increased and the voltage across A3C4 reaches 3.0 Vdc, the overload
amplifier in A3U1 narrows the pulse width to limit power transferred
through T1, thus reducing the output voltage.

Shut-Off Circuit

If the control circuit detects an abnormal status on the charger,such as
overheating of the internal battery, it holds the
Then opto-coupler A3U3 conducts and provides a trigger signal for
A3Q2. The current through A3R13, A3R12, and A3Q2 keeps A3Q1
turned on, holding the voltage of A3RP2 low (less than 1.0 Vdc) which
disables A3U1. Therefore no switching occurs and the 85901A is
disabled. A3Q2 continues to conduct until the
removed, decreasing the current through A3Q2 to less than the
minimum hold current (1 mA typical).

CHRG-SO line low.

CHRG-SO signal is

Chapter 7 7-13

Service

Control Circuit Introduction

Control Circuit Introduction

Control Circuit Assembly A2 monitors the status of the charger circuit,
inverter circuit, and internal or external battery. It also inhibits each
circuit if a problem occurs on one of them and/or the battery, and
provides a user interface through a buzzer and LED annunciators on
the front panel.

Control Circuit Block Diagram

This section contains descriptions of the operation of the A2 assembly,
circuit interconnections, and signal mnemonics. Refer to the block
diagram, Figure 7-8, for a graphic representation of this information.

7-14 Chapter 7

Figure 7-8 A2 Control Board Assembly, Block Diagram

Service

Control Circuit Introduction

Chapter 7 7-15

Service

Control Circuit Introduction

The unit is composed of three major parts: status-sensing circuits,
shut-off circuits, and user-interface circuits. Status-sensing circuits
include thermal protection, battery voltage monitor, auxiliary voltage
monitor, AC-ON monitor, charger over-voltage protection circuit, and
full-charge detector. Shut-off circuits include the inverter shut-off and
charger shut-off circuits. The user-interface circuits comprise the
buzzer and indicator driver for updates of equipment status.

Status-Sensing Circuits

The thermal protection circuit is composed of resistive bridge A2R7, R8,
and R9, in addition to A2U1-U4, which monitors the internal-battery
temperature using thermistor sensor RT1. This circuit generates signal
OHP for the shut-off circuit if the internal battery temperature rises to
71ºC. R16 connected to pin 5 of A2U1 detects the open-circuit status of
the connection between A2J2 and the thermistor.

The battery voltage monitor detects two voltage levels of the internal or
external battery. It compares the actual battery voltage with a 3V
reference, and provides alarm signal
full discharge (typically 10.5V). It also provides inverter shut-off signal
BATLOW2 to prevent over- discharging when the battery voltage is
lower than 10.0V (typical).

BATLOW1 if the battery is near

The auxiliary voltage monitor compares AUXVCC, auxiliary voltage
from the inverter, with a 3V reference and generates two inverter
shut-off signals,

AUXLOW and AUXHI. If the inverter should stop
operation by itself, AUXVCC drops to zero; the auxiliary voltage
monitor then activates the

AUXLOW signal to trigger the inverter
shut-off circuit. If an inverter feedback loop failure occurs, AUXVCC
rises to over 19V (typical) and

AUXHI is activated to shut off the

inverter.
The AC-ON monitor compares the charger output voltage CHRG (+)

and a 3V reference and sets AC-ON high and

AC-ON low to indicate the

presence of the ac line (i.e., charger is on).
The charger over-voltage protection circuit compares the charger

output and 3V reference to set the

CHRG-OVP signal low when the
charger output voltage is too high. Its purpose is to prevent internal
battery damage.

The full-charge detector amplifies the charging-current signal RM (+)
and RM (–) from the charger and compares it with a 3V reference. If the
charging current is reduced to 0.45A (typical), pin 7 of U7, FULL-CHG,
is set high to indicate that the internal battery is fully charged.

7-16 Chapter 7

Service

Control Circuit Introduction

Shut-Off Circuits

The inverter shut-off circuit is composed of diode OR gate A2CR5-CR9
and R-S flip-flop A2U2. All status signals concerning the
inverter
AUXLOWare ORed and then connected to the set input of the R-S
flip-flop. If one or more of the status signals goes low, A2U2 is set and
its output, A2TP2, goes low.

If AC-ON is low and A2TP2 is low, INV-SO A2TP21 is set high and is
routed to A1U2 pin 7, which disables the inverter. Thus the charger
circuit always has priority over the inverter. A2R27-R28 and A2C10
provide a reset signal when the inverter switch, INV SW, is turned on.
A2CR4 provides a discharge path (about three to five seconds) for
A2C10 when INV SW is turned off to ensure that the reset network
works properly when INV SW is again turned on.

The charger shut-off circuit consists of an OR-gate, A2U5, and NAND
A2U2. If either or both
output of A2U2, TP7, is set high, disabling the charger. The output of
A2U2 does not stay high due to the latched shut-off circuitry, A2R17
and A2C6. This RC network forms a reset circuit to eliminate power-on
transients.

OHP, AC-ON, BATLOW1, BATLOW2, AUXHI, and

OHP and CHRG-OVP signals are set low, the

Buzzer and Indicator Driver

In normal operation, when the charger switch is off and the inverter
switch is on, the INVERTER LED annunciator is turned on and BATT
LOW LED annunciator is turned off. If an inverter shut-off occurs, the
INVERTER LED is turned off.

If

BATLOW1 is held low with the inverter operating, A2U4 pin 4 goes
high. It is then ANDed with the 1 Hz square wave generated by the
circuitry of A2U8: resistors A2R35, A2R36, A2R37, and A2R43, and
capacitor A2C19. This 1 Hz signal then switches the 1 kHz square wave
from A1U6 pin 15, the inverter 60 Hz oscillator. The modulated 1 kHz
square wave at A2U4 pin 10 causes the buzzer A2B1 to beep and also
blinks the BATT LOW LED on the front panel.

If

BATLOW2 is held low when the inverter is turned on, the inverter is
disabled, the buzzer is prevented from beeping, and the BATT LOW
LED is prevented from blinking.
LED through U4 pin 13, U6 pin 6, and U5 pin 12. But, since the
inverter is shut off, power is removed and all LEDs are turned off.

If the charger is turned on, the BATT CHG LED is turned on and the
BATT LOW and INVERTER status LEDs discussed above are disabled
by AC-ON and
whether the BATT LED is to be turned on or off. If the internal battery
is fully charged, BATT LOW LED will be turned off. The BATT CHG
LED is turned off when the charger is off or disabled.

AC-ON. FULL-CHG signal at pin 1 of A2U6 determines

BATLOW2 low turns on BATT LOW

Chapter 7 7-17

Service

Control Circuit Introduction

Bias Power Supply

The bias power-supply circuit is a three-terminal voltage regulator. It
receives +10V to +16V, from either the charger or battery, and regulates
it to provide +5 Vdc and a +3 Vdc reference voltage, Vref for the control
circuits.

NOTE In Firgure 7-9 please change “F1” to R88.”

7-18 Chapter 7

Control Circuit Introduction

Figure 7-9 A1 Inverter Board Assembly, Component Locations

Service

Chapter 7 7-19

Service

Control Circuit Introduction

NOTE In Figure 7-10 please change “F1(1A)” to “R88 1.”

7-20 Chapter 7

Service

Control Circuit Introduction

7-22 Chapter 7

Service

Control Circuit Introduction

7-24 Chapter 7

Control Circuit Introduction

NOTE In Figure 7-11 please change “L1” to “W1.”

Figure 7-11 A2 Control Board Assembly, Component Locations

Service

Chapter 7 7-25

Service

Control Circuit Introduction

NOTE In Figure 7-12 please note the following changes:

• “L1 10mH” to “W1”

• “R17 47K” to “R17 470K”

• “C6 4.7uF 16V” to C6 10uF 16V”

7-26 Chapter 7

Service

Control Circuit Introduction

7-28 Chapter 7