Agilent E8285A Service Manual

Agilent Technologies E8285A CDMA

Mobile Station Test Set

Assembly Level Repair

Firmware Version: A.01.29 to A.02.04 (100-1000, 1700-2000 MHz)

Firmware Version: A.04.53 and above (800-1000, 1700-2000 MHz)

CALL CONTROL UTILITIES

Answer Print Printer I/O config Help
Call/

End/

Page

USER

K1'
K1

K2'
K2

K3'
K3

Assign

K4

Release

K5

Shift

Register Tests Config Previous Message

Release

CDMA SCREENS

Cell config Spectrum SMS
Call

Gen

control

MS report MS FER
RX test

Ref set
Increment

10

Low limit

IBASIC
reset

Cancel

Authen-

control

tication

TX test

TX
range

DATA FUNCTIONS DATA

Meter

Average

Increment

Increment

set

x 10

High limit

ANALOG SCREENS

Call

Duplex Spectrun

control

RX test TX test AF

7 8 9

4 5 6

1 2 3

0 . +/-

Yes

No
Ratio

On/Off

W

DUPLEX OUTRF IN/OUTPOWER ANTENNA IN VOLUME AUDIO OUT AUDIO IN

analyzer

analyzer

%dBHz

High

Preset

Hold
Meas
reset

Address
Local

Save
Recall

Enter

Ghz
dBm
dB

MHz
V
%

kHz
mV
s

mW

µV
ms

Low

DO NOT apply RF
when in standby

Max power 2.5W

Max power 60 mW Max 12V peak Max

Agilent Part Number E8285-90033

Revision C

Printed in U.S.A.

June 2000

42V peak

Notice

Information contained in this document is subject to change without
notice.

All Rights Reserved. Reproduction, adaptation, or translation without
prior written permission is prohibited, except as allowed under the
copyrigh t laws.

This material may be reproduced by or for the U.S. Government
pursuant to the Copyright License under the cl ause at DFARS

52.227-7013 (APR 1988).
© Copyright 2000 Agilent Technologies

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Manufacturer’s Declaration

This statement is provided to comply with the requirements of the
German Sound Emission Directive, from 18 January 1991.

This product has a sound pres sur e emission ( at t he ope rato r posit ion) <
70 dB(A).

• Sound Pressure Lp < 70 dB(A).

• At Operator Position.

• Normal Operation.

• According to ISO 7779:1988/EN 27779:1991 (Type Test).

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anf orderungen der
Maschinenlärminformationsverordnung vom 18 Januar 1991.

• Schalldruckpegel Lp < 70 dB(A).

•Am Arbeitsplatz.

• Normaler Betr i e b.

• Nach ISO 7779:1988/EN 27779:1991 (Typprüfung).

3

Safety Considerations

!

GENERAL

This product and related documentation must be reviewed for
familiarization with safety markings and instructions before operation.

This product has been designed and tested in accordance with IEC

Publication 1010, “Safety Requirements for Electronic Measuring
Apparatus,” and has been s u pplied in a safe condition. This instruction
documentation contains information and warnings which must be
followed by the user to ensure safe operation and to maintain the
product in a safe condition.

SAFETY EARTH GROUND

A uninterruptible safety earth ground must be provided fro m the main
power source to the product input wiring terminals, power cord, or
supplied power cord set.

CHASSIS GROUND TERMINAL

To prevent a potential shock hazard, always connect the rear -panel
chassis ground terminal to earth ground when operating this
instrument from a dc power source.

SAFETY SYMBOLS

Indicates instrument damage can occur if indicated oper ating limits are
exceeded. Refer to the instructions in this guide.

Indicates hazardous voltages.
Indicates earth (ground) terminal

WARNING A W ARNING note denotes a hazard. It calls attention to a

procedure, practice, or the like, which, if not correctly
performed or adhered to, could result in personal injury. Do not
proceed beyond a W ARNING s ign until the indicated conditi ons
are fully understood and met.

CAUTION A CAUTION note denotes a hazard. It calls attention to an operation

procedure, practic e, or the like, which, if not correctly performed or
adhered to, could result in damage to or destruction of part or all of t he
product. Do not proceed beyond an CAUTION note until the indicated
conditions are fully understood and met .

4

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Safety Considerations for this Instrument

WARNING This product is a Safety Class I instrument (provided with a

protective earthing ground incorporated in the power cord). The
mains plug shall only be inserted in a socket outlet provided with a
protective earth contact. Any interruption of the protective conductor
inside or outside of the product is li kely to make the product
dangerous. Intentional interruption is prohibited.

Whenever it is likely that the protection has been impaired, the
instrument must be made inoperative and be secured against any
unintended operation.

If this instrument is to be energized via an autotransformer (for
voltage reduction), make sure the common terminal is connected to
the earth terminal of the power source.

If this product is not us ed as specified, the protec tion provid ed by t he
equipment could be impaired. This product must be used in a normal
condition (in which all means for protection are intact) only.

No operator serviceable parts in this product. Refer servicing to
qualified personnel. To prevent electrical shock, do not remove
covers.

Servicing instructions are for use by qualified personnel only. To
avoid electrical shock, do not perform any servicing unless you are
qualified to do so.

The opening of covers or removal of parts is likely to expose
dangerous voltages. Disconnect the product from all voltage sources
while it is being opened.

Adjustments described in the manual are performed with power
supplied to the instrument while protective covers are removed.
Energy available at many points may, if contacted, result in personal
injury.

The power cord is connected to internal capacitors that my remain
live for 5 seconds after disconnecting the plug from its power supply.

For Continued protection against fire hazard, replace the line fuse(s)
only with 250 V fuse(s) or the same current rating and type (for
example, normal blow or time delay). Do not use repaired fuses or
short circuited fuseholder s.

5

CAUTION Always use the three -prong ac power cord supplied with this product.

Failure to ensure adequate earth grounding by not using this cord may
cause product damage.

This product is designed for use in Installation Category II and
Pollution Degree 2 per IEC 1010 and IEC 664 respectively. For indoor
use only.

This product has autoranging line voltage input, be sure the supply
voltage is within the specified range.

V entilation Require ments: When installing the prod uct in a cabinet, the
convection into and out of the product must not be restri cted. The
ambient temperature (outside the cabinet) must be less than the
maximum operating temperature of the product by 4° C for every 100
watts dissipated in the cabinet. If the total power dissipated in the
cabinet is greater than 800 watts, then forced convection must be used.

6

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Product Markings

CE - the CE mark is a registered trademark of the European
Community. A CE mark accompanied by a year indicated the year the
design was proven.

CSA - the CSA mark is a registered trademark of the Canadian
Standards Association.

7

Agilent Technologies Warranty Statement
for Commercial Products

E8285A CDMA Mobile Station T es t Set
Duration of Warranty: One Year

1. Agilent warrants Ag ilent hardwar e, a ccessories and supplies aga inst
defects in materials and workmans hip for the period sp ecified above .
If Agilent receives notice of such defect s during the w arranty peri od,
Agilent will, at its option, either repair or replace products which
prove to be defective. Replacement prod ucts may be either new or
like-new.

2. Agilent warrants that Agilent software will not fail to execute its
programming instructions, for the period specified above, due to
defects in material and workmanshi p when properly installed and
used. If Agi l en t re ceives notic e o f su ch d e fe cts during the war ra n ty
period, Agilent will replace softwa re media which does not execute
its programming instructions due to such defects.

3. Agilent does not warrant that the operation of Agilent products will
be uninterrupted or error free. If Agilent is unable, within a
reasonable time, to repair or replace any product to a condition as
warranted, customer will be enti tled to a refund of the purchase
price upon prompt return of the product.

4. Agilent products may contain remanufactured parts equivalent to
new in performance or may have been subject to incident al use.

5. The warranty period begins on the date of delivery or on the date of
installation if installed by Agilent. If customer schedules or delays
Agilent installation more than 30 days after delivery, warranty
begins on the 31st day from delivery.

6. Warranty does not apply to defects resulting from (a) improper or
inadequate maintenance or calibration, (b) sof tware, interfacing,
parts or supplies not supplied by Agilent, (c) unauthorized
modification or misuse, (d) operation outside of the published
environmental specifications for the product, or (e) improper site
preparation or maintenance.

7. TO THE EXTENT ALLOWED BY LOCAL LAW, THE ABOVE
WARRANTIES ARE EXCLUSIVE AND NO OTHER WARRANTY
OR CONDITION, WHETHER WRITTEN OR ORAL IS
EXPRESSED OR IMPLIED AND AGILENT SPECIFICALLY
DISCLAIMS ANY IMPLIED WARRANTIES OR CONDITIONS OR
MERCHANTABILITY, SATISFACTORY QUALITY, AND FITNESS
FOR A PARTICULAR PURPOSE.

8

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8. Agilent will be liable for damage to tangibl e property per incident up
to the greater of $300,000 or the actual amount paid for the product
that is the subject of the claim, and for damages for bodily injury or
death, to the extent that all suc h damages are d etermined by a cou rt
of competent jurisdiction to have been directly caused by a defective
Agilent product.

9. TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES
IN THIS WARRANTY STATEMENT ARE CUSTOMER’S SOLE
AND EXCLUSIVE REMEDIES. EXCEPT AS INDICATED ABOVE,
IN NO EVENT WILL AGILENT OR ITS SUPPLIERS BE LIABLE
FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL,
CONSEQUENTIAL (INCLUDING LOST PROFIT OR DATA), OR
OTHER DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR
OTHERWISE.

FOR CONSUMER TRANSACTIONS IN AUSTRALIA AND NEW
ZEALAND: THE WARRANTY TERMS CONTAINED IN THIS
STATEMENT, EXCEPT TO THE EXTENT LAWFULLY
PERMITTED, DO NOT EXCLUDE RESTRICT OR MODIFY AND
ARE IN ADDITION TO THE MANDATORY STATUTORY RIGHTS
APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU.

9

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer’s Name:

Agilent Technologies

Manufacturer’s Address:

Spokane Division
24001 E. Mission Avenue
Liberty Lake, Washington 99019-9599
USA

declares that the product

Product Name:
Model Number:
Product Options:

CDMA Mobile Station Test Set
Agilent Technologies E8285A

All

conforms to the following Product specifications:

Safety: IEC 61010-1:1990+A1+A2 / EN 61010-1:1993+A2

EMC: CISPR 11:1990/EN 55011:1991- Group 1, Class A

IEC 61000-3-2:1995 / EN 61000-3-2: 1995

EN 50082-1:1992

IEC 801-3:1984 3V/m

IEC 801-4:1988 0.5 kV Sig. Lines, 1 kV Power Lines

Supplementary Information:

This product herewith complies with the requirements of
the Low Voltage Directive 73/23/EEC and the EMC
Directive 89/336/EEC and carries the CE-marking
accordingly.

Spokane, Washington USA November 20, 1998

European Contact: Your local Agilent Technologies and Service Office or Agilent Technologies GmbH
Department ZQ/Standards Europe, Herrenbe rger Strasse 130, D-71034 Böbl inger, Germany (FAX[phone])

10

Vince Roland
Reliability & Regulatory
Engineeri ng Manager

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Table 1

United States of America:
Agilent Technologies
Test and Measurement Call
Center
P.O. Box 4026
Englewood, CO 80155-4026

(tel) 1 800 452 4844

Japan:
Agilent Technologies Japan Ltd.
Measurement Assistance Center
9-1 Takakura-Cho, Hachioji-Shi,
Tokyo 192-8510, Japan

(tel) (81) 456-56-7832
(fax) (81) 426-56-7840

Asia Pacific:
Agilent Technologies
19/F, Cityplaz a One,
111 Kings Road,
Taikoo shing, Hong Kong, SAR

Canada:
Agilent Technologies
Canada Inc.
5159 Spectrum Way
Mississauga, Ont ar io
L4W 5G1

(tel) 1 877 894 4414

Latin America:
Agilent Technologies
Latin America Region
Headquarters
5200 blue Lagoon Drive,
Suite #950
Miami, Florida 33126
U.S. A.

(tel) [phone]
(fax) [phone]

Europe:
Agilent Technologies
European Marketing
Organization
P.O. Box 999
1180 AZ Amstelveen
The Netherlands

(tel) (3120) 547 9999
Australia/New Zealand:

Agilent Technologies
Australia Pty Ltd
347 Burwood Highway
Forest Hill, Victoria 3131

(tel) 1 800 629 485 (Australia)
(fax) (61 3) 9272 0749
(tel) 0 800 738 378 (New
Zealand)
(fax) (64 4) 802 6881

(tel) (852) 2599 7899
(fax) (852) 2506 9233

11

Agilent Technologies E8285A Support
Contacts

The documentation supplied with your Test Set is an excellent source of
reference, application, and service information. Please use these
manuals if you are experiencing technical problems:

Table 2 Support Documentation

User’s Guide Quick Reference Guide
Application Guide Assembly Level Repair
Reference Guide CD-ROM

If you have used the manuals and still have application questions,
contact your local Agilent Technologies Sales Representative.

Repair assistance is available for the Agilent E8285A CDMA Mobile
Station Test Set from the factory by phone and e-mail. External and
internal Agilent users can contact the factory via email. Par ts
information is also available from Agilent.

When calling or writing for repair assistance, please have the following
information ready:

• Instrument model number (E8285A)

• Instrument Serial Number (tag located on the rear panel).

• Installed options - if any (tag located on the rear panel).

• Instrument firmware revision (displayed at the top of the screen

when the Test Set is powered up, and is also displayed on the
CONFIGURE screen).

Support Telephone Numbers:

1 800 827 3848 (RF Comms Service Assistance, U.S. only)
1 509 921 3848 (RF Comms Service Assistance, International)
1 800 227 8164 (Agilent Direct Parts Ordering, U.S. only)
1 800 403 0801 (Agilent Instrument Support Center, U.S. only)
1 916 783 0804 (Agilent Service Parts Identification, U.S. & Intl.)

12

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Table 3

Earth
Ground

Line Neutral

Power Cables

Plug type

Plug Descriptions

male/female

Straight/Straight
Straight/90

°

Agilent Part #
(cable & plug)

8120-1689
8120-1692

Cable Descriptions

79 inches, mint gray
79 inches, mint gray

Used in the following locations:
Bangladesh, Belgium, Benin, Bolivia, Boznia-Herzegovina, Bulgaria, Burkina Faso, Burma,

Burundi,Byelarus
Cameroon, Canary Islands, Central African Republic, Chad, Chile, Comoros, Congo, Croatia,

Czech Republic, Czechoslovakia
Denmark, Djibouti
East Germany, Egypt, Estonia, Ethiopia
Finland, France, French Guiana, French Indian Ocean Areas
Gabon, Gaza Strip, Geor gia, Germany, Gozo, Greece
Hungary
Iceland, Indonesia, Iran, Iraq, Israel, Italy, Ivory Coast
Jordan
Kazakhstan, Korea, Kyrgystan
Latvia, Lebanon, Libya, Lithuania, Luxembourg
Macedonia, Madeira Islands, Malagasy Republic, Mali, Malta, Mauritania, Miquelon, Moldova,

Mongolia, Morocco, Mozambique
Nepal, Netherlands, Netherlands Antilles, Niger, Norway
Oman
Pakistan, Paraguay, Poland, Portugal
Rep. South Africa, Romania, Russia, Rwanda
Saudi Arabia (220V), Senegal, Slovak Republic, Slovenia, Somalia, Spain, Spanish Africa, Sri

Lanka, St. Pierce Islands

13

Plug type

Earth
Ground

Line Line

Earth
Ground

Line Neutral

Plug Descriptions

male/female

Agilent Part #
(cable & plug)

Sweden, Syria
Tajikistan, Thailand, Togo, Tunisa, Turkey, Turkmenistan
USSR, Ukraine, Uzbekistan
W estern Africa, Western Sahara
Yugoslavia
Zaire

Table 4

Cable Descriptions

Plug Type

Plug Descriptions

male/female

Straight/Straight
Straight/90°

Used in the following locations:

Peru

Table 5

Plug Type

Plug Descriptions

male/female

Straight/Straight
Straight/90°

Agilent Part #
(cable & plug)

Cable Descriptions

8120-0698 90 inches, black

Agilent Part #
(cable & plug)

8120-2104
8120-2296

Cable Descriptions

79 inches, gray
79 inches, gray

Used in the following locations:

Switzerland

14

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Table 6

125V

Earth
Ground

LineNeutral

Plug Type

Plug Descriptions

male/female

Straight/Straight
Straight/90°
Straight/Straight

Agilent Part #
(cable & plug)

8120-1378
8120-1521
8120-1751

Used in the following locations:

American Samoa
Bahamas, Barbados, Belize, Bermuda, Brazil
Caicos, Cambodia, Canada, Cayman Islands, Columbia, Costa Rica, Cuba
Dominican Republic
Ecuador, El Salvador
French West Indies
Guam, Guatemala, Guyana

Cable Descriptions

90 inches, jade gray
90 inches, jade gray
90 inches, jade gray

Haiti, Honduras
Jamaica
Korea
Laos, Leeward and Windward Islands, Liberia
Mexico, Midway Islands
Nicaragua
Other Pacific Islands
Panama, Philippines, Puerto Rico
Saudi Arabia (115V, 127V), Suriname
Taiwan, Tobago, Trinidad, Trust Territories of Pacific Islands
Turks Island
United States
Venezuela, Vietnam, Virgin Islands of the U.S.
Wa ke Island

15

Table 7

JIS C 8303, 100 V

Earth
Ground

LineNeutral

Earth
Ground

Line

Neutral

Plug Type

Plug Descriptions

male/female

Straight/Straight
Straight/90°

Used in the following locations:

Japan

Table 8

Plug Type

Plug Descriptions

male/female

90°/Straight
90°/90°
Straight/Straight

Agilent Part #
(cable & plug)

8120-4753
8120-4754

Agilent Part #
(cable & plug)

8120-2956
8120-2957
8120-3997

Cable Descriptions

90 inches, dark gray
90 inches, dark gray

Cable Descriptions

79 inches, gray
79 inches, gray
79 inches, gray

Used in the following locations:

Denmark
Greenland

16

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Table 9

Earth
Ground

Line

Neutral

Line

Neutral

Earth
Ground

Plug Type

Plug Descriptions

male/female

Straight/Straight
Straight/90°

Used in the following locations:

Botswana
India
Lesotho
Malawi
South-West Africa (Namibia), Switzerland
Zambia, Zimbabwe

Table 10

Agilent Part #
(cable & plug)

8120-4211
8120-4600

Cable Description

79 inches, mint gray
79 inches, mint gray

Plug Type

Plug Descriptions

male/female

Straight/Straight
Straight/Straight
Straight/90°
Straight/90°

Used in the following locations:

System Cabinets

Agilent Part #
(cable & plug)

8120-1860
8120-1575
8120-2191
8120-4379

Cable Descriptions

60 inches, jade gray
30 inches, jade gray
60 inches, jade gray

15.5 inches, jade gray

17

Table 11

Earth
Ground

Line

Neutral

Plug Type (Male)

Plug Descriptions

male/female

90°/Straight
90°/90°

Used in the following locations:

Bahrain, British Indian Ocean Terr., Brunei
Canton, Cyprus
Enderbury Island, Equatorial Guinea
Falkland Islands, French Pacific Islands
Gambia, Ghana, Gibraltar, Guinea
Hong Kong
Ireland
Kenya, Kuwait

Agilent Part #

(cable and plug)

8120-1351
8120-1703

Cable Descriptions

90 inches, mint gray
90 inches, mint gray

Macao, Malaysia, Mauritius
Nigeria
Qatar
Seychelles, Sierra Leone, Singapore, Southern Asia, Southern Pacific Islands, St. Helena, Sudan
Tanzania
Uganda, United Arab Emirates, United Kingdom
Yeman (Aden & Sana)

18

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Table 12

Line

Neutral

Earth
Ground

Plug Type

Plug Descriptions

male/female

Straight/Straight
Straight/90°

Used in the following locations:

Argentina, Australia
China (People’s Republic)
New Zealand
Papua New Guinea
Urugray
We stern S amoa

Agilent Part #
(cable & plug)

8120-1369
8120-0696

Cable Descriptions

79 inches, gray
80 inches, gray

19

ATTENTION

Static Sensitive

Devices

This instrument was constructed in an ESD (electro-static discharge) protected environment. This is
because most of the semi conductor devices used in this instrument are susceptible to damage by
static discharge.

Depending on the magnitude of the charge, device substrates can be punctured or destroyed by
contact or mer e pr oxim ity of a stat ic char ge. Th e r esult can cause degra dation of d evice performance,
early failure, or immediate destruction.

These charges are generated in numerous ways such as simple contact, separation of materials, and
normal motions of persons working with static sen sitive devices.

When handling or s ervicin g equi pment co ntaini ng st atic sensit ive devi ces, ad equate p r eca ution s mus t
be taken to prevent device damage or destruction.

Only those who are thoroughly familiar with industry accepted techniques for handling static
sensitive devices should attempt to service circuitry with these devices.

In all instances, measures must be taken to prevent static charge build-up on work surfaces and
persons handling the devices.

20

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Contents

1. Introduction

Test Set Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Troubleshooting Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Repair Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Calibration and Performance Verification . . . . . . . . . . . . . . . . . . . . . . 38

System Power Calibration Program . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Test Equipment Needed for the System Power Calibration Program 40

E8285A Support Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Hardware and Firmware Enhancements . . . . . . . . . . . . . . . . . . . . . . 42

Ordering New Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

2. Troubleshooting

How to Troubleshoot the Test Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Self-Test Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Functional Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

AF, RF, and CDMA Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Frequently Encountered Diagnostic Messages . . . . . . . . . . . . . . . . . . 68

Manual Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Service Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

3. Disassembly and Replaceable Parts

Before You Start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

4. Functional Verification

5. Periodic Adjustments/Calibration

Periodic Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Storing Calibration Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Running the Periodic IQ, or IQ Demod Path Calibration Programs. 130

Periodic Calibration Menu Descriptions. . . . . . . . . . . . . . . . . . . . . . . 131

Setting the Timebase Latches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

IQ Calibration Program Description . . . . . . . . . . . . . . . . . . . . . . . . . 137

IQ Demod Path Calibration Program Description. . . . . . . . . . . . . . . 139

6. Performance Tests

Procedure and Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

RF Generator FM Distortion

Performance Test 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

RF Generator FM Accuracy

Performance Test 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

RF Generator FM Flatness

Performance Test 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

RF Generator Residual FM

Performance Test 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

RF Generator Level Accuracy

21

Contents

Performance Test 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

RF Generator Harmonics Spectral Purity

Performance Test 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

RF Generator Spurious Spectral Purity

Performance Test 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

AF Generator AC Level Accuracy

Performance Test 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

AF Generator DC Level Accuracy

Performance Test 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

AF Generator Residual Distortion

Performance Test 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

AF Generator Frequency Accuracy

Performance Test 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

AF Analyzer AC Level Accuracy

Performance Test 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

AF Analyzer Residual Noise

Performance Test 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

AF Analyzer Distortion and SINAD Accuracy

Performance Test 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

AF Analyzer DC Level Accuracy

Performance Test 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

AF Analyzer Frequency Accuracy to 100 kHz

Performance Test 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

AF Analyzer Frequency Accuracy at 400 kHz

Performance Test 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Oscilloscope Amplitude Accuracy

Performance Test 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

RF Analyzer Level Accuracy

Performance Test 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

RF Analyzer FM Accuracy

Performance Test 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

RF Analyzer FM Distortion

Performance Test 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

RF Analyzer FM Bandwidth

Performance Test 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

RF Analyzer Residual FM

Performance Test 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Spectrum Analyzer Image Rejection

Performance Test 24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

CDMA Generator RF IN/OUT Amplitude Level Accuracy

Performance Test 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

CDMA Generator DUPLEX OUT Amplitude Level Accuracy

Performance Test 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

CDMA Generator Modulation Accuracy

Performance Test 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

CDMA Analyzer Average Power Level Accuracy

Performance Test 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

CDMA Analyzer Channel Power Level Accuracy

Performance Test 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

22

Contents

7. Performance Test Records

RF Generator FM Distortion

Performance Test 1 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

RF Generator FM Accuracy

Performance Test 2 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

RF Generator FM Flatness

Performance Test 3 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

RF Generator Residual FM

Performance Test 4 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

RF Generator Level Accuracy

Performance Test 5 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

RF Generator Harmonics Spectral Purity

Performance Test 6 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

RF Generator Spurious Spectral Purity

Performance Test 7 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

AF Generator AC Level Accuracy

Performance Test 8 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

AF Generator DC Level Accuracy

Performance Test 9 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

AF Generator Residual Distortion

Performance Test 10 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

AF Generator Frequency Accuracy

Performance Test 11 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

AF Analyzer AC Level Accuracy

Performance Test 12 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

AF Analyzer Residual Noise

Performance Test 13 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

AF Analyzer Distortion and SINAD Accuracy

Performance Test 14 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

AF Analyzer DC Level Accuracy

Performance Test 15 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

AF Analyzer Frequency Accuracy to 100 kHz

Performance Test 16 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

AF Analyzer Frequency Accuracy at 400 kHz

Performance Test 17 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

Oscilloscope Amplitude Accuracy

Performance Test 18 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

RF Analyzer Level Accuracy

Performance Test 19 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

RF Analyzer FM Accuracy

Performance Test 20 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238

RF Analyzer FM Distortion

Performance Test 21 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

RF Analyzer FM Bandwidth

Performance Test 22 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

RF Analyzer Residual FM

Performance Test 23 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

Spectrum Analyzer Image Rejection

Performance Test 24 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

23

Contents

CDMA Generator RF IN/OUT Amplitude Level Accuracy

Performance Test 25 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

CDMA Generator DUPLEX OUT Amplitude Level Accuracy

Performance Test 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244

CDMA Generator Modulation Accuracy

Performance Test 27 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

CDMA Analyzer Average Power Level Accuracy

Performance Test 28 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

CDMA Analyzer Channel Power Level Accuracy

Performance Test 29 Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

8. Block Diagrams

Signal Flow and Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

RF Input/Output Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

RF Analyzer Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

Spectrum Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

Audio Analyzer Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

CDMA Analyzer Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

CDMA Generator Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

Audio Generator Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

RF Generator Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

Reference/Regulator Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284

Instrument Control Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

GPIB Serial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

9. Service Screen

Troubleshooting with the SERVICE Screen . . . . . . . . . . . . . . . . . . . 294

24

1 Introduction

This manual explains how to repair and calibrate the Agilent
Technologies E8285A CDMA/PCS Mobile Station Test Set; called the
“Test Set” throughout this manual.

Throughout this manual you will see this note:

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

The purpose of this note is to bring attention to RF frequency band
coverage provided by firmware revisi on A.04.5X and above. Test Sets
with firmware revision A.02.XX and below can operate at RF
frequencies from 100 (usable to 30 MHz) to 1000 and 1700 to 2000 MHz.

“Input value out of range”, will be displayed if invalid

25

Introduction

Test Set Description

Test Set Description

Several analog and digital test instruments are integrated into the
E8285A CDMA Mobile Station Test Set to test Code Division Multiple
Access (CDMA) digital cellular, PCS, and s everal types of analog mobile
phones, such as AMPS, NAMPS, and TACS.

Figure 1-1 The E8285A CDMA Mobile Station Test Set

N

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Some of the instrument functions in the Test Set include:

• Synthesized AM, FM, and IQ modulation signal generator

• AM, FM and IQ modulation analyzer

• Duplex offset signal generator

• SSB demodulator

• RF power meter

• Audio and RF frequency counter and RF frequency error meter

• AC and DC voltmeter

• Distortion, SINAD, and signal-to-noise-ratio meters

• Two variable audio sources

• Oscilloscope

• Spectrum analyzer and tracking generator (optional)

• Signaling encoder and decoder

• DC current meter

26 S:\agilent\e8285\ALR\Book\chapters\intro.fm

Introduction

Test Set Description

Some of these functions are dire ctly replaceable as semblies (such as the
spectrum analyzer); some functions are digitally derived from other
assemblies (such as the oscilloscope). Most of the replaceable
assemblies are plug-in components.

Most instrument functions can be cont rolled by front-panel (local)
controls and by remote commands ( using a c onnected controll er). Power
on/off, volume, and squelch controls cannot be accessed remotely.
Controls are grouped together on display screens that are usually
associated with a specific task (suc h as making a call to a CDMA mobile
phone).

An Instrument BASIC (IB ASIC) control ler is also built into the T es t Set
to allow automated operation without using an external controller. This
computer also has the ability to be a system controller to other tes t
system instruments. Refer to the Test Set’s user’s guide for information
on using the IBASIC computer (also referred to as the IBASIC
controller).

27

Introduction

Product Description

Product Description

The E8285A CDMA Mobile Test Set is designed to meet the needs of
Cellular Provider Point of Sale Retailers, manufacturing customers,
and other customers who require CDMA Mobile Phone test capability.
The Tes t Set is very similar to it’s predecessor, the Agilent Technologies
8924C with the addition of newly designed RF I/O module, upconverter
and downconverter assemblies. These assemblies extend the Test Set
frequency range to cover the 1800- 1900 MHz PCS Cellular band as well
as providing standard 800 MHz cellular band coverage.

Internal Ope rating System

A Motorola® 68020 − 33 MHz microprocessor acts as the ho st pro cesso r
of the Test Set. It receives commands from the front-panel co ntrols and
communicates directly with almost every assembly inside the Test Set.
The host is also in constant communication with several other
microprocessors located throughout the Test Set.

Communications to the GPIB , s erial, a nd paralle l ports are t hrough the
control int e rface assembly to th e ho st processor.

This processor is also the core for the internal IBASIC computer. The
IBASIC computer is used t o load and run var ious sof tw are pac kages f or
automated radio tests. It is also responsible for executing the internal
diagnostic routines used to troubleshoot a failing inst rument.

Instrument Frequency References

The Test Set reference ti mebase path co n s i st s o f tw o assemblies, an
ovenized high stability reference assembly and a CDMA reference
assembly. These two assemblies provide all frequency, phase, and
timing signals used to accurately synthesize all of the Test Set’s source
and analysis signals. A master reference signal can originate from
either an external source at the 10 MHz input on the rear panel, or
from the internal 10 MHz phase locked loop oscillator located on the
high stability reference asse mbly. The high stability refere nce assembly
provides timebase references for the analog assemblies and a 10 MHz
reference signal to the CDMA reference assembly. The CDMA reference
assembly uses this signal to generate clock and timing signals for
internal CDMA assemblies, provide the 10 MHz output signal to the
rear panel, and generate the AWGN (Additive White Gaussian Noise) I
& Q noise source signals.

28 S:\agilent\e8285\ALR\Book\chapters\intro.fm

Figure 1-2 Reference Signal Generation

Introduction

Product Description

Rear Panel External
Reference In
1, 2, 5, 10 MHz

Rear Panel External
Reference Out
10 MHz

OC XO H igh Stability

Reference Assembly

10 MHz In

CDMA Reference

Assembly

AWGN

To internal analo g assemblies.
See block diagrams for mor e
information.

To internal digital assemblies.
See block diagrams for more
information.

To I/Q Modulator Assembly

29

Introduction

Product Description

RF Analysis

RF signals connected to the front panel RF IN/OUT connector or
ANTENNA IN connector go to the RF I/O module. The signal level and
RF frequency are measured, and the level is adjusted using fixed step
and variable attenuators in the separate downconverter module.

CAUTION Over-Power Damage

The ANTENNA IN connector is only used for very low level signals
(60 mW or less), and cannot be used for Transmitter (TX) Power
measurements. Exceeding this limit may destroy the RF I/O module.
The RF IN/OUT connector is used to m easure direc t mobile transm itter
power up to 2.5 Watts continuous.

The downconverter mixes the input signal with a local oscillator signal
from the Receiver Synthesizer ass embly to produc e a 114.3 MHz, 6 14.3,
or 385.7 MHz IF signal (depending on the frequency of the received
signal). The signal goes through a bandpass filter and then on to the
Receiver assembly.

If the IF is 614.3 or 385.7 MHz, the Receiver assembly mixes the signal
with a 500 MHz local oscillator (LO) signal from the Reference
assembly to obtain the 114.3 MHz IF. If the IF is 114.3 MHz, the signal
bypasses this downconversion. The 114.3 MHz si gnal divides into two
paths.

Figure 1-3 Received Signal Downconversion

Downconverter

1200-1700 MHz from
Receiver Synthesizer
Assembly

385.7 MHz

RF I/O

RF IN/OUT

114.3 MHz

614.3 MHz

ANTENNA

IN

Power

Detector

486-1026 MHz from
Receiver Synthesizer
Assembly

Receiver Assembly

114.3 MHz

500 MHz from

Reference Assy

To LO/IF Demod Assembly

114.3 MHz

AM, FM, SSB

Demodulation

30 S:\agilent\e8285\ALR\Book\chapters\intro.fm

AM, FM, or SSB Modulation Analysis

For AM, FM, or SSB signals, t h e 114.3 MHz signal is downconverted to

10.7 MHz and routed through a user-selected IF bandpass filter
(15 kHz or 230 kHz) that is centered around the 10.7 MHz IF. AM and
SSB signals are demodulated at this point; FM signals are
downconverted to a 700 kHz IF before demodulation. The demodulated
signal is routed to the Audio Analyzer 1 assembly for audio frequency
filtering. This assembly is also connected to the front-panel AUDIO IN
connector for direct audio measur eme n ts. Several low pass and high
pass filters can be selected, as well as a C-Message or optional CCITT
bandpass filter. Frequency and voltage measurements are then made
on this signal by the Measurement assembly. The signal is then routed
to the Audio Analyzer 2 assembly.

The Audio Analyzer 2 assembly routes the signal through a
user-selectable detector. A variable frequency notch filter may also be
selected for SINAD and distortion measurements. The detector’s si g n al
is then sent to several other assemblies:

Introduction

Product Description

• The Measurement assembly measures and displays the modulation
level (such as FM deviation) and provide the input to the
oscilloscope.

• The Signaling Source Analyzer assembly for signaling decoding.

• The rear-panel AUD MONITOR OUTPUT connector for e xternal use

of the demodulated signal.

• The front-panel VOLUME control and internal speaker to listen to
the demodulat e d sign a l .

Figure 1-4 AM, FM, and SSB Signal Demodulation and Filtering

Receiver Assembly

114.3 MHz
IF

10.7 MHz

125 MHz

Audio Analyzer 2 Assembly

Selectable Detectors

RMS
RMS*SQRT2

Pk+
Pk-

.......

15 kHz

230 kHz

IF Filters

(centered around 10.7 MHz)

Variable Freq.

Notch Filter

10 MHz from

Reference Assembly

RMS

Detector

AM Demod

SSB Demod

FM Demod

Signaling Source Analyzer
AUD MONITOR OUTPUT (Rear panel)
Measurement Assembly

Audio Analyzer 1 Assembly

AUDIO IN

(front pane l)

VOLUME

Selectable

High-Pass

Filters

Selectable

Low-Pass

Filters

DC Volts and

Audio Frequency

Measurements

31

Introduction

Product Description

CDMA Signal Analysis

The 114.3 MHz IF also goes to the CDMA LO/IF Demodulation
assembly. This assembly provides a through path to the spec trum
analyzer (Option 102) for all RF signals, and also provides down
conversion for CDMA signals, measurements and call proce ss ing.

To do wnconvert the CDMA signal, the 114.3 MHz IF is mixed with a

117.9864 MHz local oscillator (LO) signal to produce a 3.6864 MHz IF.
(The LO signal is from an oscillator that is phase locked to a 10 MHz
signal from the CDMA Reference module.)

The 3.6864 MHz signal is split and goes to the Receiver DSP assembly,
and also through a variable-gain IF amplifier before IQ demodulation.
The demodulated I and Q baseband signals are then routed to the
Digital Cellsite assemblies.

Under control from the Pr otocol Processor as sembly, the Digital Cellsit e
assemblies use the demodulated IQ inform ation to s et up and mai ntain
calls to CDMA phones. The Digital Cellsite 1 assembly also supplies
feedback to the C D M A L O / I F Demodulation assembly to con t rol the
level of the variable-gain IF amplifier into the demodulator.

The Receive DSP assembly converts, digitizes, and provides final
analysis on the 3.6864 MHz signal to make measurements, such as rho,
timing accuracy, carrier feedthrough, and phase error.

Figure 1-5 Analyzing CDMA Signals

114.3MHz IF
from Receiver

CDMA LO/IF Demodulation Assembly

3.6864 MHz

117.9864 MHz

Demodulator

IQ

IF Gain Control

I data

Q data

T o Spectrum Analyzer

Digital Cellsite

1 & 2 Assemblies

IQ Decoding and

CDMA Generator

Data Coding

Receive DSP Assembly

CDMA IQ Modulation

Measurements

Protocol

Processor

Call Setup and

Control

32 S:\agilent\e8285\ALR\Book\chapters\intro.fm

RF Signal Generation

The Signal Generator Synthesizer assembly creates a 500 to 1000 MHz
signal. The reference signal for the synthesizer is supplied by the High
Stability Reference assembly. The synthesizer’s fr equency is varied
using a divider network i n t he feed back ci rcuit of the ph ase loc ked lo op .
Any FM modulation signal (from the Modulation Distributi on
assembly), and the frequency sweep signal for the spectrum analyzer
and tracking generator, are integrated into this feedback loop. If a
CDMA signal is not being generated, the 500-1000 MHz signal is
passed through the I/Q Modulator assembly, bypassing the I/Q
modulator.

IQ Modulation

If a CDMA signal is being generated, the signal is I/Q modulated in the
I/Q Modulator assembly, using data from the Analog Cellsite assembly.
The Analog Cellsite assembly gets its dat a from the two Digital Cellsite
assemblies, which are controlled by the Protocol Pro cessor assembly. Up
to eight code channels of CDMA modulation data and noise may be
summed into the IQ modulator at one time. These channels provide
phone paging, synchronization, voice (traffic) transmission, and other
CDMA system functions.

Introduction

Product Description

Final Frequency Conversion and Leveling

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

The RF Output assembly performs three tasks:

• Mixes or divides the 500 to 1000 MHz signal to produce signals

• Provides AM modulation (when selected).

• Controls the signal level out of the assembly using an Automatic

The signal from the RF Output assembly is sent to one of two paths in
the Upconverter assembly. RF frequencies from 30 MHz to 1 GHz route
through the bypass path. PCS frequencies are upconverted to supply
frequencies from 1700 to 2000 MHz. The user-selected frequency
contains desired modulation (AM, FM, or CDMA), or a continuou s wa ve
(CW) signal. The level has been adjusted to provide the required level
(after going through RF I/O assembly).

“Input value out of range”, will be displayed if invalid

below 500 MHz (down to 30 MHz). A 1 GHz LO from the Reference
assembly is used for mixing.

Level Control (ALC) loop.

33

Introduction

Product Description

RF and Duplex Outputs

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

The RF I/O assembly receives the signal from the Upconverter
assembly and routes it to the selected output connector: RF IN/OUT or
DUPLEX OUT. The signal first goes to a variable attenuator for level
control.

If the DUPLEX OUT connector is selected, the signal the n goes direct ly
to that connector without additional attenuation. If the RF IN/OUT
connector is used as an output, the signal passes through additional
attenuation before reaching the connec tor. This is why a greater signal
level can be output through the DUPLEX OUT connector than through
the RF IN/OUT connector.

“Input value out of range”, will be displayed if invalid

34 S:\agilent\e8285\ALR\Book\chapters\intro.fm

Figure 1-6 RF Generation Path Overview

Introduction

Product Description

1 MHz from
Reference
Assembly

FM Mod. from

Mod. Dist.

Spec. Analyzer

Sweep

500-1000 MHz

Output Assembly

Signal Generator Synthesizer

500-1000 MHz

div/n

Cell Site

Protocol

Processor

500-1000 MHz

div/2

1 GHz from Reference Assembly

(main band)

250-500 MHz

(÷2 band)

250 kHz-250 MHz

(downconverted band)

Digital 1

Cell Site
Digital 2

RF Amplitude

Adjust fro m

Host Controller

IQ Modulator Assembly

I/Q Modulator

4 channels of

I&Q data

1 channel of

I&Q data

Amplitude
Modulator

Automatic

Level Control

Distribution Assembly.

&

ADC

Summing

RF
Amp

AM from Mod.

Analog Cell Site

AWGN (Noise) from
CDMA Reference

Upconverter Assembly

RF I/O Assembly

Variable Step

Attenuator

To the Receiver

Assembly

DUPLEX
OUT

RF IN/OUT

35

Introduction

Troubleshooting Strategy

Troubleshooting Strategy

You can repair the Test Set yourself or s end it to your local Agilent
Technologies Instrument Support Center. Before starting a repair, you
should become familiar with basic Test Set operation using the user’s
guide.

Troubleshooting relies on built-in diagnostics. Because some diagnostic
results may be ambiguous, further interpr etation and testing may be
required. There are several diagnostic routines built into the Test Set:

• Power-up self -test diagnostics to test controller functioning. These
are automatically run when the instrument is turned on, and can
also be run after the instrument has been on.

• RF (Radio Frequency) assembly diagnostics.

• AF (Audio Frequency) assembly diagnostics.

• Digital assembly diagnostics for CDMA signals.

Troubleshooting hints in this manual include:

• Instructions on how to begin troubleshooting (see chapter 2,

"Troubleshooting").

• Block diagrams and theory of operation (this chapter and chapter 8,

"Block Diagrams").

• Detailed information about the built-in diagnostics (see chapter 2,

"Troubleshooting").

• Error message explanations (see chapter 10, "Error Messages").

36 S:\agilent\e8285\ALR\Book\chapters\intro.fm

Repair Process

Repairing the Test Set consists of:

• Identifying the faulty ass e mb l y – see chapt er 2, "Troubl eshooting"

• Ordering a replacement assembly – see chapter 3, "Disassembly and

Replaceable Parts"

• Replacing the faulty assembly – see chapter 3, "Disassembly and

Replaceable Parts"

• Downloading calibration data – see chapter 2, "Troubleshooting" and
regenerating calibration data – see See “System Power Calibration

Program” on page 39.

• Performing periodic calibration – see chapter 5, "Periodic

Adjustments/Calibration"

• Fu n ctional Verification – see chapter 4 , "Functional Verification"

Introduction

Repair Process

37

Introduction

Calibration and Performance Verification

Calibration and Performance Verification

The Tes t Set periodically requires some maintenance to verify that it
meets its published specifications. See “Periodic Adjustments” on page

126. Periodic Adjust men ts (calibration) consists of running several

built-in calibration programs. The recommended interval for periodic
adjustments is 12 months. An external frequency counter and dc
voltmeter are required. See Chapter 5, "Periodic

Adjustments/Calibration" on page 5.

NOTE The recommended Test Set calibration interval is 24 months. This is

accomplished by performing the performance tests (see Chapter 6,

“Performanc e Tests,” on page 141) or sending the Test Set to an Agilent

Calibration Center or other qualified calibration lab.
The performance tests verif y t h at the Te st Set performs as indicated in

the Specifications. These tests should be performed if the Test Set’s
operation is suspect, even though it passes all internal diagnostic
checks. This ident i fies whether a problem actually exists in the Test
Set, or if an application problem exists outside of the Test Set.

Several assemblies, when replaced, require running specific periodic
calibration procedures to crea te calibration factors for that assembly. In
other cases, the ca l i b ration data w ill be included wi th th e replaceme n t
assembly on a memory card. Instructions that come with the
replacement assembly explain how to downl oad the calibration data.
(This is not considered part of periodic calibration.)

NOTE When troubles h oo t i n g the Test Set, it is somet i me s de si r a b le to swap a

known-good assembly (perhaps from another Test Set) for a
suspected-fau l t y as se mb l y. If the swapped assembly requires
calibration data, most assemblies will operate well enough with the
original assembly’s calibration data to troubleshoot and run the
diagnostics. However, do not expect the Test Set to meet its
specifications . Also, some assemblies may appear to fail because of the
incorrect ca l i b ration data.

38 S:\agilent\e8285\ALR\Book\chapters\intro.fm

System Power Calibration Program

This adjustment program is not found in ROM of the Test Set. This
program resides on a PCMCIA Memory Card, pa rt-number
E6380-61811. It has to be downloaded from the memory card.

This program generates system power calibration factors for the Test
Set. The purpose of this program is to generate calibration factors for
the RF Input/Output Section. This assures that the Test Set will meet
its power measurement accuracy specifications after repair.

An RF signal generator and a power splitter produce two signals with
the same power level. One signal is measured by the power meter, the
other is applied to the input of the Test Set. The program measures
these levels at selected frequencies and then generates calibration
factors so the Test Set readings match the power readings. These
calibration factors are stored in the Test Set.

Communication between the active instrument(s) is through the Test
Set’s GPIB port. An optional printer can be connected to the Test Set’s
GPIB, serial , or parallel port. Typically this is done from the Printer
Setup field of the SOFTWARE menu screen.

Introduction

System Power Calibration Program

To run the System Power Calibration program:

1. Connect GPIB cables from the Test Set to the signal generator and
power meter.

2. Insert the PCMCIA Memory Card, p/n E6380-61811, into the Test
Set’s memory card slot.

3. Press the Tests key to access the TESTS (M ain Me nu ) sc re e n.

4. Select the field under

5. Select

6. Select the field under

7. Select SYSPWR0

8. Select

9. Follow the instructions on the screen.

Card under the Choices: menu.

Run Test (K1 key).

Select Procedure Location:

Select Procedure Filename:

39

Introduction

Test Equipment Needed for the System Power Calibration Program

Test Equipment Needed for the System Power
Calibration Program

For the System Power Calibration program you will need the
equipment listed in table 1-1. Because this calibration program is
written specifically for this equipment, no substitutions are possible.

Table 1-1 Equipment List for System Power Calibration Program

Equipment Ty pe

Signal Generator 8648B Option 1EA
Power Meter 436A

Power Sensor 8482A

Power Splitter 11667A
GPIB Cables (2 cables required, 3 if

GPIB printer is used.)
Printer (op tional) Any serial, parallel, or GPIB printer

Agilent Technologies
Model Number

437B
438A
EPM-441A
EPM-442A
8901B
8902A

ECP-E18A
11722A

Any GPIB cable

40 S:\agilent\e8285\ALR\Book\chapters\intro.fm

E8285A Support Contacts

The documentation supplied with your Test Set is an excellent source of
reference, applications, and service information. Please use these
manuals if you are experiencing technical problems:

• Application information is located in the E8285 Application Guide
(p/n E8285-90019) and the GPIB Condensed Programming
Reference Guide (p/n E8285-90020).

• Operation and reference information are included in the E8285A
CDMA Mobile Station T est Set User’s Guide (p/n E8285-90018).

• Calibration and repair information in this manual.

If you have used the manuals and still have application questions,
contact your local representative.

Repair assistance is available from the factor y by phone and email.
Internal Agilent Technologies users can contact the factory through
email. Parts informatio n is also av ailable from Agilent Technologies.
When calling or writing for repair assistance, please have the following
information ready:

Introduction

E8285A Support Contacts

• Instrument model number

• Instrument serial number; tag located on the rear panel.

• Installed options - if any; tag located on the rear panel.

• Instrument firmware revision; displayed at the top of the screen

when the Tes t Set is powered up, and is also displayed on the
CONFIGURE screen.

Support Telephone Numbers and Email Address

• Call Center .................................... ............................1-800-922-8920

• Instrument Support Center......................................1-800-403-0801

• RF Comms Service Assistance,

International..............................................................1-509-921-3848

U.S. only......................................................................1-800-827-3848

• Service Parts Identification,

U.S. & International...................................................1-916-783-0804

Direct Parts Ordering,

U.S. only......................................................................1-800-227-8164

• Ema il . .... ... .... ..... .. .... ..... .... .. ..... .... .. .... Spo ka ne_ Ser vice @ag ile nt .co m

41

Introduction

Hardware and Firmware Enhancements

Hardware and Firmware Enhancements

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

The hardware and firmw a re of the Test Set are enhanced on a
continuous basis. If an assembly is replaced, it is recommended that the
firmware be upgraded at the same time. This is important if an
assembly-level repair is performed because e xchange a ssemblies , whic h
may be of a later revision than the one being replaced, may require a
later revision of the firmware to function correctly.

“Input value out of range”, will be displayed if invalid

42 S:\agilent\e8285\ALR\Book\chapters\intro.fm

Ordering New Manuals

The Tes t Set is designed to allow future upgrades to hardw a re and
firmware which may obsole te some of the material in this manual. For
the latest document revisions and information, call the Direct Parts
Ordering office (U.S. only), 1-800-227-8164.

For local and remote operating i nformation, including des criptions of all
controls, connectors, and programming syntax, refer to the E8285
User’s Guide, part number E8285-90018.

For application information refer to the E8285 Application Guide, p/n
E8285-90019. Also, all manuals are available on CD-ROM, p/n
E8285-10003.

Introduction

Ordering New Manuals

43

Introduction

Ordering New Manuals

44 S:\agilent\e8285\ALR\Book\chapters\intro.fm

2 Troubleshooting

This chapter explains how to isolate a problem to the defective assembly.
Troubleshooting uses the Test Set’s built-in diagnostics. If diagnostics can’t
identify the faulty assembly, supplementary info rmation in the form of manual
troubleshooting procedures is provided.

45

Troubleshooting

How to Troubleshoot the Test Set

How to Troubleshoot the Test Set

Document the resul t of e ach step in case y ou need to contact Ag il ent Technologies
for service assi stance. Gene ral trou bleshooti ng steps ar e illust rated in figure 2-2 on

page 47.

NOTE Periodic Adjustment Interval

The calibration p rog rams Periodic Calibration, IQ Calibrati on and IQ Demod Path
Calibration should be performed after the re placement of any assembly re ferred to
in table 5-1, "Assembly Calibr at ion Information" on page 127, or at lea st ever y 24
months. See Chapter 5, "Periodic Adjustments/Calibration" on page 125 for
details.

On power-up, the Test Set runs the Self-Test Diagnostic. Most of the Test Set’s
digital control functions are tested. The outcome of the test appears on the display
(if operating) and on four (DIAG) LEDs 0,1,2, 3, and 4 viewable d igi ta l c ontr oller
unit, see figure 2-1 (you must remove the external and top-interna l covers to view
the LEDs).

Figure 2-1 LEDs

Digital Controller Board

DIAG LEDs

012

J1

3

J4

CAL

MODULE

P1P2

controller5.eps

DS3 DS4

DS2

DS1

46 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

How to Troubleshoot the Test Set

Figure 2-2 Agilent E8285A Test Set Troubleshooting Flowchart

BEGIN

Power-up the Test Set to run self diagnostics.

Troubleshooting

Is display blank?

NO

Does a self test error
message appear?

NO

Run the Functional Diagnostics on
the SERVICE MENU. See "AF, RF,

NO

and CDMA Diagnostics" on page 64.

If you still suspect a problem, use the
manual troubleshooting procedures.
See "Manual Troubleshooting

Procedures" on page 70.

YES

YES

NO

NO

Fan is not running or
does T est Set shut off
after a few seconds?

YES

1. Check for a faulty fan.

2. Check for a faulty power supply.

3. Check for a faulty assembly pulling
down line voltage.

1. Check EL Display or ribbon cable.

2. Check display driver.

Refer to "Reading Front Panel or GPIB Codes" on page 51.

Is error code SRBC
or miscellaneous
hardware related?

YES

Turn off Test Set and remove external
and internal top covers. Power-up Test
Set and read Status LEDs for Self-Test
errors. Refer to "Reading LED Codes"

on page 53.

NO

NO

Problem detected?

Problem detected?

YES

YES

Repair Test Set according
to the diagnostic
recommendations.

Repair Test Set according
to findings.

NO

Perform the functional verification tests, refer to Chapter 4 , "Functional Verification" on page 111.

All OK?

YES

END

47

Troubleshooting

Self-Test Diagnostics

Self-Test Diagnostics

On power-up the Test Set runs a diagnostic self-test. Most of the Test Set’s digital
functions are tested. The outcome of the test appears on the display (if operating)
and on four LEDs viewable and the digital controller board (you must remove the
external and top-internal covers to view the LEDs).

The self-test diagnostic can be run three ways:

1. The test runs automatically when the Test Set is turned on. After the Test Set
powers up, a message appear s at the top of the dis pla y. If one or more tests fail,
the message reports the failure with a hexadecimal code.

During the test, coded fail ure inf ormati on is dis played on four L EDs on the top
of the controller board, see figure 2 -1 on pa ge 46. The Test Set’s cover must be
removed to view these LEDs. See Chapter 3, “Disassembly and Replaceable

Parts,” on page 83 for disassembly and replacement instructions.

2. The test runs when the Test Set receives the query *TST? over GPIB. The
resultant decimal code can be read over the bus.

3. The test runs when the
menu is selected.

Self Test menu item of the Functional Diagnostics

To Start Troubleshooting

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

1. Turn on the Test Set to automatically run the self test diagnostics.

2. After power-up, the top line of the Test Set’s display should show copyright

“Input value out of range”, will be displayed if invalid

• If the Test Set does not power up, see "If the Test Set Fails to Power-up" on

page 49.

• If all self-t est diag nostics p ass, and t he front- panel key s and knob wor k, you

can assume that the digi tal control assemblies wo rk.

information and the firmware revision code. The second line should display

All self tests passed.

• If the Test Set powers-up with

failed. Error code:<hexadecimal error code>:”

"Reading Front Panel or GPIB Codes" on page 51.

“One or more self-tests

, see

• See "Frequently Encountered Diagnostic Messages" on page 68 for other

error messages that might appear on the second line of the display.

3. The CDMA CALL CONTROL screen should be displayed. Two conditions
cause a different screen to be displayed on power-up:

48 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Troubleshooting

Self-Test Diagnostics

o A SAVE/RECALL register named POWERON was saved to automatically

power-up the Test Set in a different state. Press the Preset key before
proceeding; this will restore the Test Set to the factory power-up condition.

oThe

Autostart Test Procedure on Power-Up: field (of the

“TESTS [Execution Conditi ons]” screen) is set to
loaded program. Press the Shift key, then press the Cancel key to stop the
program. Press the Preset key to rest ore the Test Set to the factory power-up
condition.

To turn the autostart function off, press the

Execution Cond (under the SET UP TEST SET: heading). The

autostart function is at the bottom of the screen; turn it

If the Test Set Fails to Power-up

1. Is the Test Set plugged in? Listen for fan operation. If you don’t hear it, check
the line fuse, see figure 2-3.

Figure 2-3 Fuse

EXT REF
INPUT

CSD2 SERIAL

10 MHz
OUTPUT

16X CHIP
OUTPUT

On to automatically run a

Tests key, then select

Off.

S1 SERIAL PORT

HP-IB

fuse2.eps

Line Fuse

Spare Fuse

2. If there is no image on the display, remove the Test Set’s covers and check the
power supply LEDs: +5V, −12V, +12V (see figure 2-5 on page 51). If one is
out, the power supply or regulator board is faulty. If no LEDs are lit, confirm
that the Test Set is connected to the main power source. (Also, see step 5.)

3. Check the LEDs on the Controller assembly, see figure 2-5 on page 51. The
LEDs should all light up immediately on power-up, and then go off several
seconds after a beep is heard. If the L EDs do not light when the Test Set is
powered-up, either the Controller or the Memory/SBRC assembly is faulty.

49

Troubleshooting

Self-Test Diagnostics

4. If the Test Set does not power-up properly, but the fan operates and the power
supply voltages are correct on the Power Supply Regulator outputs, the
Controller may be failing. Check TP2 on the Controller for +5V. If +5V is
present, the Controller assembly is fau lty.

5. If there is no display, but VIDEO OUT port on the rear panel has the signal
shown in figure 2-4, then the Display assembly is faulty. If the signal is not
present, then Display Drive assembly is faulty.

Figure 2-4 VIDEO OUT Signal

500mV/div.

500µ s/div.

50 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Figure 2-5 Diagnostic and Power Supply LEDs

Digital Controller Board DIAG LEDs

DIAG LEDs

012

J1

3

P1P2

controller5.eps

CAL

MODULE

J4

Troubleshooting

Self-Test Diagnostics

Power Supply LEDs

DS1: +5D
DS2: +12STBY
DS3: –12V
DS4: +12A

Reading Front Panel or GPIB Codes

Failure codes are listed in the table below. If more than one failure occurs, the
failure code will be the sum of the individual failure codes. The nature of the
failure and the assembly most-likely at fault is also listed.

DS3 DS4

DS2

DS1

51

Troubleshooting

Self-Test Diagnostics

Table 2-1 Return Values for Self-Test Diagnostic Failures

Returned Error Code
Detected Failure
Failed Assembly

Hexadecimal

(displayed)

Microprocessor Digital Controller 0002 2
ROM Digital Controller 0004 4
RAM Memory/SBRC 0008 8
RAM Memory/SBRC 0010 16
Timer Controller 0020 32
Real-Time Clock Memory 0040 64

Decimal

(GPIB)

Keyboard (stuck key)

Keypad

a

0080 128

RS-232 I/O Memory/SBRC 0100 256
Serial Bus Communication

Any Non-Optional assembly

b

0200 512

Signaling Board Self-Test Signaling Source/Analyzer 0400 1024
Display Drive Self-Test Display Drive 0800 2048
Miscellaneous Hardware

a. Could also be the digital controller with a faulty key-down detector.
b.This checks the ability of the digital controller to communicate with any hardware on the bus.

c. This message occurs if expected hardware is absent or not responding to the digital controller.

Several Possible Assemblies

c

1000 4096

52 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Troubleshooting

Self-Test Diagnostics

Reading LED Codes

When the self-test diagnostic reports a failure, more information about the failure
may be available inside the Test Set. This additional information is output to the
four LEDs on the top of the digital controller assembly. The failure codes are sent
out as code sequenc es. Figu re 2-6, "Re ading t he Sel f-Test Diagnostic. The Internal

LEDs," on page 54 and the tables following it document some of the more useful

code sequences. You may need to run the Self-Test Diagnostic several times to
decode a particular LED sequence.

NOTE The LEDs output self-test diagnostic codes only when t he Test Set is powering up.

The LEDs remain off when the self-test diagnostic is initiated through
programming or when running the functional diagnostics. To read the LED codes,
the Test Set’s cover must be removed.

If the Test Set has no faults that can be detected by the Self-Test Diagnostic, the
four LEDs on the Controller assembly will light and remain on for about ten
seconds. During that period, a short beep will be heard. Then the LEDs will
extinguish and remain off.

If a fault is d etected during the test:

1. The four LEDs will go on for about four seconds.

2. The LEDs will blink a failure code which corresponds to the error listed in

table 2-1, "Return Values for Sel f -Test Diagnostic Failures" on p age 5 2 . Figure
2-7, "First LED Patterns," on page 55 shows the blinking LED codes.

3. Two non-blinking LED codes will follow. The inter pretation of these codes
depends on the prece ding bli nking code . Two sets of the non-blinking c odes are
listed: see figure 2-8, "Non-blinking LED Codes For Serial Bus

Communication Failure," on page 56 and figure 2-9, "Non-Blinking LED
Codes for Miscellaneous Hardware Failure," on page 57.

4. If there is more than one failure, the test will loop back to step 2 and repeat
until the last failure is reported.

The pattern generated by the LEDs can be interpreted as a binary-weighting code.
The LED (labeled 0) is the least-significant bit (see figure 2-6 on page 54).

For example if the LEDs blinking pa ttern is Off, On, On, On (read ing left-to-right
or LEDs “3 2 1 0”), the binary number is 0111 or decimal 7. The error codes shown
in table 2-1, "Return Values for Self-Test Diagnostic Failures" on page 52 are
weighted by the binar y valu e. Th e weighted val ue for this exampl e is d ecimal 27 =
128 or hexadecimal 80. (This failure is easy to simulate; simply power-up the Test
Set while holding down a key.)

53

Troubleshooting

Self-Test Diagnostics

Figure 2-6 Reading the Self-Test Diagnostic. The Internal LEDs

1. Remove the Test Set’s external cover.

2. Turn power on.

3. Read the LED sequence on the digital
controller board (see below) and compare with
the patterns below.

NOTE

LED Legend

= off

= rapid blink

= steady on or slow blink

For multiple failures, the failure patterns
described below will repeat for all failures
detected.

LED Sequences

No Failures...

The LEDs will light
for approximately 10
seconds, then all will
turn off.

012

3

Failures... three pat terns are displayed:

The first blinks rapidly
and indicates the type of
failure.

012

3

012

See the following tables.
(This example indicates
a Serial Bus
Communication
problem.)

Digital Controller Board

DIAG LEDs

012

J1

3

The second and third patterns
blink slowly and indicate
failure details.

3

012

3

(This example indicates a
faulty Audio Analyzer 1
assembly.)

J4

P2

54 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

CAL

MODULE

P1

controller5.eps

Figure 2-7 First LED Patterns

Troubleshooting

Self-Test Diagnostics

If the first LED p attern
displayed is...

0

321

Then the failure is...

Microprocessor

LED Legend

= off

ROM Checksum (See note 1.)
RAM (See note 2.)

= rapid blink

= steady on or slow blink

RAM (See note 3.)
Timer
Real-Time Clock
Keyboard (stuck key or faulty key-down detector )
Control Interface (See note 4.)
Serial Bus Communication (see figure 2-8 on page 56)
Signaling Board Self Test
Display Drive Self Test
Miscellaneous Hardware (see figure 2-9 on page 57)

NOTES

1. Second and third LED failure patte rns:
0001 and 0001 for any main ROM failure
0001 and 0002 for boot ROM failure

2. Second and third LED failure patte rns:
0001 and 0001 for Memory/SBRC board RAM failure
0001 and 0002 for Controller board RAM failure

3. Second and third LED failure patte rns:
0001 and 0001 for Memory/SBRC board RAM failure
0001 and 0010 for Memory/SBRC board RAM failure

4. Second and third LED failure patterns for Control Interface:
0001 and 0001 for Serial Port 9 failure
0001 and 0010 for Serial Port 10 failure
0001 and 0011 for Serial Port 11 failure
0001 and 0100 for Serial Port 14 failure
0001 and 1101 for Parallel Port 15 failure
0001 and 1110 for Parallel Port 16 failure

55

Troubleshooting

Self-Test Diagnostics

Figure 2-8 Non-blinking LED Codes For Serial Bus Communication Failure

If the second and third LED

patterns displayed are....

0

321

0

Then the failure is...

321

Modulation Distribution
Output Section
Audio Analyzer 1
Audio Analyzer 2
Reference
RF Input/Output
Downconverter
Receiver
Spectrum Analyzer
Signal Generator Synthesizer
Receiver Synthesizer
Upconverter

LED Legend

= off
= rapid blink

= steady on or slow blink

LO IF/IQ Modulator
CDMA Generator Reference
Digital Cellsite

56 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Self-Test Diagnostics

Figure 2-9 Non-Blinking LED Codes for Miscellaneous Hardware Failure

Troubleshooting

If the second and third LED

patterns displayed are....

0

321

0

LED Legend

= off

= rapid blink

= steady on or slow blink

Then the failure is...

321

Reference
Audio Filter 1 - C-Message Filter
Audio Filter 2 - 6 kHz BPF
Receive DSP
Digital Cellsite 1 and 2

= don’t care

57

Troubleshooting

Functional Diagnostics

Functional Diagnostics

The Diagnostics (of the SERVICE7 MENU, shown in figure 2-13 on page 61)
check whether or not major portions of the Test Set are functioning. They may
pinpoint faults in the circuitry to the faulty assembly, or they may direct the use of
any or all of the AF, RF, CDMA diagnostics to more e xtensively te st the circuitry.

Accessing the Diagnostic Tests

CAUTION A fifteen minute warm up is required. The measurement limits of the SERVICE7

diagnostic tests are valid only at room temperature; that is, 20º to 25ºC (65º to
75ºF).

1. Press the Preset key.

2. Press the Tests key. The TEST (Mai n Menu) scr een appea rs, see f igure 2- 10 on

page 58.

3. Set the Select Procedure Location: field to ROM.

4. Set the Select Procedure Filename: field to SERVICE7 .

Figure 2-10 TESTS (Main Menu) Screen

5. To define test conditions, see "Define Test Conditions" on page 59. To
configure the Test Set for a printer, see "Configuring a Printer" on page 60.

6. On the Tests (Main Menu), select the Run T est field ( or pr ess K1), and wa it f or
the SERVICE MENU to appear, see figure 2-13 on page 61.

7. Choose the diagnostic test (Functional, AF, RF, or CDMA) to run by turning
the knob to move the pointer and then pressing the knob to select the test.

8. Follow the instructions on the screen.

58 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

As some of the tests run, you may be offered the options to alter test execution
conditions by selecting:

•

Loop to run the test continuously

•

Pause to pause the tests

•

Stp Fail (stop-failure) to stop on a failure

•

Sgl Step (single-step) to pause the test after each measurement

For descriptions of the diagnostic options, refer to:

• "Functional Diagnostics Menu" on page 62.

• "AF Diagnostics" on page 64

• "RF Diagnostics" on page 65

• "CDMA Diagnostics" on page 67

Define Test Conditions

1. On the TESTS (Main Menu) screen (see figure 2-13), select Exec Execution
Cond to access the TESTS (Execution Conditions) screen.

Figure 2-11 TESTS (Execution Conditions)

Troubleshooting

Functional Diagnostics

2. Set up the Output Results To: field. Select:

• Crt

• Select Printer

to view measurements only on the display.

to print the test results as well as display them on the CRT.

3. Set the Output Results For: field to All

4. Set up the If Unit-Under-Test Fails: field.

• Select Continue

• Select Stop

to continue to the next test point.

to pause testing at that p oint.

59

Troubleshooting

Functional Diagnostics

5. Set up the Test Procedure Run Mode: field.

• Select Continuous

• Select Single Step

to run the tests continuously.

to pause after each measurement.

6. Verify that the Autostart Test Procedure on Power-Up: setting is Off

Configuring a Printer

Only perform the following steps if you want to print test results to a printer.

1. Press the Tests key.

2. On the TESTS (Main Menu) select
(Printer Setup) screen appears.

Figure 2-12 TESTS (Execution Conditions)

.

Print Printer Setup. The TESTS

3. Under PRINT SETUP:, select Model: and the printer of your choice.

4. Set the Printer Port: for the side-panel connector your printer is connected to
(Parallel 15, Serial 9, or GPIB).

If an GPIB printer i s u sed, you need to enter the printer’s two-digit bus addr ess
when the Printer Adrs field appears (Example; enter 1 or 01 for bus address

701). Also, press the
CONFIGURE screen, and set the Mode field to Control.

5. Under P AGE CONTROL: , s et the Lines/Page: and Form Feed (FF at Star t: ,
and FF at End:) parameters if necessary.

60 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Shift key, then the INST CONFIG key to access the I\O

Figure 2-13 SERVICE7 Program Screens

TESTS (Mani Menu)

SERVICE MENU

Troubleshooting

Functional Diagnostics

RF Diagnostics

Audio Diagnostics

CDMA Diagnostics

RF Diagnostics

61

Troubleshooting

Functional Diagnostics

Functional Diagnostics Menu

To run the Functional Diagnostics, see "Accessing the Diagnostic Tests" on page

58.

NOTE The diagnostics are intended t o he lp in locating the source of catastro phi c f ai lur es .

Occasionally, a test will fail with the test results being only s lightly out of limits.
Such failures do not ne cessa rily ind icate that the Test Set is operati ng outs id e of i ts
published specifications or that it is otherwise faulty. Further testing (such as
running the performance tests) will be required in such cases.

NOTE Many of the internal diagnostic and calibration procedures use low-level latch

commands to control the instrument settings. Many latch settings persist even
through a preset. They can only be reset by an instrument power down or by
explicitly reseting each latch. This phenomenon is the reason the message

“

Direct latch write occurred. Cycle power when done

servicing

settings persist, problems can arise in running these programs. For example,
prematurely terminating a test in a diagnostic (using the Pause and Exit keys) and
restarting another test may cause failures in that test because of improper latch
settings. It is best to run tests to completion before starting another one. Also, be
sure to cycle the power off and on when done servicing the Test Set.

.” is displayed the first time a latch is wr itten to. Because latch

Figure 2-14 Functional Diagnostics Scr ee n

Functional Diagnostics

62 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Troubleshooting

Functional Diagnostics

RF Modules

The Average and TX power meters, Channel Power Meter, RF analyzer, IF
analyzer and spectrum analyzer are used to test the signal generator. Both the
internal and external paths of the RF/IO assembly are used in the tests.

Analog Modulation

The demodulator in the RF analyzer, and the spectrum analyzer are used to check
the accuracy, distortion, and residuals of the FM and AM frequenc ies. The co unter
is used to measure the audio frequency.

CDMA Loo p b a ck

CDMA Analyzer is used to measure Test Mode Rho on a signal from the CDMA
Generator. This test is only a rough indicator of CDMA functionality.

Self Test

The power-up Self-Test Diagnostics are run. Refer to "Self-Test Diagnostics" on

page 48.

Power Supplies

The different levels of the power supply are measured with the internal voltmeter.

63

Troubleshooting

AF, RF, and CDMA Diagnostics

AF, RF, and CDMA Diagnostics

NOTE The diagnostics are intended t o he lp in locating the source of catastro phi c f ai lur es .

Occasionally, a test will fail with the test results being only s lightly out of limits.
Such failures do not ne cessa rily ind icate that the Test Set is operati ng outs id e of i ts
published specifications or that it is otherwise faulty. Further testing (such as
running the performance tests) will be required in such cases.

NOTE Many of the internal diagnostic and calibration procedures use low-level latch

commands to control the instrument settings. Many latch settings persist even
through a preset. They can only be reset by an instrument power down or by
explicitly reseting each latch. This phenomenon is the reason the message

“

Direct latch write occurred. Cycle power when done

servicing

settings persist, problems can arise in running these programs. For example,
prematurely terminating a test in a diagnostic (using the Pause and Exit keys) and
restarting another test may cause failures in that test because of improper latch
settings. It is best to run tests to completion before starting another one. Also, be
sure to cycle the power off and on when done servicing the Test Set.

.” is displayed the first time a latch is wr itten to. Because latch

AF Diagnostics

This program tests the audio functions of the following assemblies:

• Audio Analyzer 2

• Audio Analyzer 1

• Modulation Distribution

• Signaling Source/Analyzer (AF Generators 1 and 2 only)

• Measurement (only a few selected inputs)

After initial cabling, all tests can be run in a loop mode without further
intervention. This makes it easier to catch intermitte nt failures. To run the AF
diagnostics, see "Accessing the Diagnostic Tests" on page 58.

NOTE A fifteen minute warm up is required. The measurement limits of the SERVICE7

diagnostic tests are valid only at room temperature; that is, 20º to 25ºC (65º to
75ºF).

64 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Figure 2-15 AF Diagnostics Screen

Audio Diagnostics

Troubleshooting

AF, RF, and CDMA Diagnostics

RF Diagnostics

When a test fails, a diagnosis is given in three parts:

• A diagnostic code.

• The name of the assembly or assemblies most likely to have failed.

• A rating of the confidence (high, medium, or low) of the diagnosis.

This program tests the RF functions of the following assemblies:

• Downconverter

• RF Output

• Signal Generator Synthesizer

• Reference

• Receiver

• Receiver Synthesizer

• Spectrum Analyzer (optional)

• RF I/O

• Upconverter

Some tests require cabling before the RF Diagnostics can be run; but all tests can
be run in a loop mode without further intervention . Running in loop mo de makes it
easier to catch interm ittent fa ilures. To run these diagnostics, see "RF Di agnost ics"

on page 65.

65

Troubleshooting

AF, RF, and CDMA Diagnostics

NOTE A fifteen minute warm up is required. The measurement limits of the SERVICE4

diagnostic tests are valid only at room temperature; that is, 20º to 25ºC (65º to
75ºF).

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message

“Input value out of range”, will be displayed if invalid

frequencies are set.

Figure 2-16 RF Diagnostics Screen

RF Diagnostics

When a test fails, a diagnosis is given as:

• Sometimes a diagnostic code.

• The name of the assembly or assemblies most likely to have failed.

• Sometimes a rating (high, medium, or low) of the confidence of the diagnosis.

66 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

CDMA Diagnostics

The Digital Diagnostics test the assemblies required for CDMA-formatted IQ
modulation.

These assemblies include:

• CDMA Reference

• LO/IF Demod

• I/Q Modulator

• Cell Site Analog

The CDMA Reference, LO/IF Demod, and I/Q Modulator are also used when
generating or analyzing analog signals.

NOTE Before ordering a replacement assembly...

Before ordering an assembly based on the results of the diagnostics, you should
verify the diagnos ti cs by other means if possible . This could include using manual
troubleshooting pro cedures and de scriptions of the AF, RF , and CDMA diagnostics
in this chapter, and/or block diagrams in Chapter 8, “Block Diagrams,” on page

249. If you still lack confidence in troubleshooting or diagnosing the problem or

faulty assembly, call the Agilent Call Center (1-80 0-922-8 920) for tr oubleshoo ting
assistance.

Troubleshooting

AF, RF, and CDMA Diagnostics

Figure 2-17 CDMA Diagnostics Screen

CDMA Diagnostics

67

Troubleshooting

Frequently Encountered Diagnostic Messages

Frequently Encountered Diagnostic Messages

Warning/Error Messages

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

Error mess ages that app ear on the second line of the Test Set’s display frequently
occur while any of the SERVICE7 program diagnostic tests ar e ru nni ng. The most
complete and general list of error messages is in the “Error Messages” chapter of
the Test Set’s Reference Guide. (Some messages relating specifically to
troubleshooting can b e found i n Chapter 10 , "Error Message s" on page 2 91.) Some
of the messages you can expect to occur while running the SERVICE7 program
diagnostic tests are as follows:

“Input value out of range”, will be displayed if invalid

•

Direct latch write occurred. Cycle power when done
servicing.

This message appears the first ti me the dia gnosti c pro gram dire ctly a ddress es a
latch. The message should be ignored and cleared when you make a normal
(not a diagnostic) measurement with the Test Set. To clear this message the Test
Set should be turned off and back on again.

•

Change Ref Level, Input Port or Attenuator (if us ing
“Hold”).

Printer does not respond. This usually indicates that one or more

•

settings on the TESTS ( Printer Setup ) screen are s et incorrec tly for your pr inter.
Also, check that the printer’s power is on and that it is correctly cabled. For
GPIB printe rs make sure the printer is correctly addressed. If a serial printer is
used, you may have to change the serial communication settings on the I/O
CONFIGURE screen (press
message times out after a few se conds, and the output desti natio n is change d to
CRT by the program.

ERROR 173 IN XXXX Active/system controller req’d (where

•

”XXXX” represents a line number). Indicates that the Test Set’s internal

IBASIC computer must be set as a system control ler for some reason. This
usually indicates that the
screen was set to
screen is set to

Control and run the diagnostic again.

The SERVICE7 program commonly generates this message.

This message, and similar messages, can be generally ignored.

Shift then Inst Config to get to this screen). The

Printer Port field of the TESTS (Printer Setup)

Agilent-IB but the Mode field on the I/O CONFIGURE

Talk&Lstn instead of Control. Change the mode setting to

68 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Time-outs

Troubleshooting

Frequently Encountered Diagnostic Messages

Certain failures may cause a frequency or voltage reading to time out, that is, the
time required for the measurement will be unreasonably long. If a timeout occurs,
measurement execution will stop and an error message will be displayed.

• If frequency or voltage readings have been successfully made before the
timeout, the assembly currently being tested or a multiplexer on the
Measurement assembly may be at fault.

• If most measurements fail, the Reference assembly may be supplying faulty
clock sign als to the Measurement assembly.

• Re-run the test to see if the timeout is intermittent.

69

Troubleshooting

Manual Troubleshooting Procedures

Manual Troubleshooting Procedures

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

If you are not sure a problem exists , you should attempt to duplicate the suspected
problem. This is especially important if the Test Set is being used in a new
application where misapplication, or incorrect operation of the Test Set may be
involved.

An Agilent 8924C Mobile Station Test Set combined with an Agilent 83236B
Cellular Adapter can be used to simulate a high performance CDMA base station
and may be useful in attempting to duplicate the problem.

Refer to following table to determine which diagnostic tests, performance tests,
and periodic self calibration adjustments apply to an assembly. Downloading
calibration data is discussed in Chapter 6, "Performance Tests" on page 141.

“Input value out of range”, will be displayed if invalid

Table 2-2 Relating Assemblies to Troubleshooting Aids

Assembly Name

Keypad Functional Diagnostics: Self Test No

Display No

RF I/O RF Diagnostics:

Digital Cellsite 1 & 2 Functional Diagnostics:

Upconverter RF Diagnostics: Upconverter Yes

RPG Assembly No

Front Panel No

Receive DSP Functional Diagnostics: CDMA

PCMCIA No

Signaling Source/Analyzer AF Diagnostics: Audio

Controller Functional Diagnostics: Self Test No

Memory/SBRC Functional Diagnostics : Self Test No

SERVICE7 Program Diagnostic

RF Input/Output

CDMA Loopback

Loopback

Frequency Generators 1 and 2

Test:

Sub-Test

Performance

Tes t to Perform

RF Generator:
Level Accuracy

a

Periodic Calibration

Program

PCMCIA Progra m
System Power
E6380-61811

SERVICE7:
IQ Modulator

b

Cal.-Data

Needed

Yes

Yes

No

No

c

Downconverter RF Diagnostics: Downconverter Yes

Power Supply Regulator Functional Diagnostics: Self Test No

Fans No

70 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Troubleshooting

Manual Troubleshooting Procedures

Assembly Name

Display Drive Functional Diagnostics: Self Test No

Power
Supply

Signal
Generator
Synthesizer

LO-IF/IQ Modulator CDMA Diagnostics LO_IF/IQ

RF Output RF Diagnostics: Output Yes

Reference RF Diagnostics: Reference RF Generator: Residual FM Yes

Receiver
Synthesizer

CDMA Generator
Reference

Receiver RF Diagnostics: Receiver RF Analyzer:

Power Supply No

Spectrum
Analyzer (optional)

Control
Interface

Modulation
Distribution

SERVICE7 Program Diagnostic

Functional Diagnostics: Self Test No

RF Diagnostics:
Signal Generator Synthesizer

Mod.

RF Diagnostics: Receiver
Synthesizer

CDMA Diagnostics: CDMA Gen.
Ref.

RF Diagnostics: Spectrum
Analyzer

Functional Diagnostics: Self Test No

AF Diagnostics: Mod
Distribution Internal Paths

Test:

Sub-Test

Performance

Tes t to Perform

RF Generator: Harmonic and
Spurious Spectral Purity

RF Analyzer: Residual FM Yes

FM Accuracy

Spectrum Analyzer

AF Generator: AC L evel
Accuracy

a

Periodic Calibration

Program

SERVICE7:
IQ Modulator

SERVICE7:
IQ Modulator

SER V ICE7: Perio d ic
Calibration:
AF Gen Gain,
EXT Mod Path Gain

b

Cal.-Data

Needed

Yes

Yes

Yes

Yes

Yes

Yes

c

d

Audio
Analyzer 1

Audio
Analyzer 2

Measurement

Motherboard No

e

AF Diagnostics: Audio Analyzer 1
Internal Paths

AF Diagnostics: Audio
Analyzer 2

Functional Diagnostics: Self Test Oscill oscope SERVICE7 :

AF Analyzer:
AC Voltage Accuracy

SER V ICE7: Perio d ic
Calibration:
Audio Analyzer Offset

SER V ICE7: Perio d ic
Calibration:
VFN

Periodic Calibration:
Voltmeter Reference

Yes

Yes

Yes

a. See Chapter 6, "Performance Tests" on page 141.
b. See Chapter 5, "Periodic Adjustments/Calibration" on page 125.

c. See table 5-1, "Assembly Calibration Information" on page 127 of Chapter 5, “Periodic

Adjustments/Calibration.”

d. PCMCIA smart card supplied with kit.
e. Measurement checked indirectly by all diagnostics.
f. PCMCIA smart card supplied with kit.

f

71

Troubleshooting

Manual Troubleshooting Procedures

Verify Test Set’s Reference Path

Out-of-Lock (OOL) LEDs

Out-of-lock (OOL) LEDs light when a phase-locked loop inside an assembly is
failing. The signal generator synthesizer and the receiver syn thesizer assemblies
have these LEDs mounted close to the top of the modules. The location of each
LED is labeled on the assembly.

Verify that the CDMA generator reference and the reference are working before
troubleshooting the receiver synthesizer and/or the signal generator synthesizer
assemblies.

Figure 2-18 Out-of-lock LEDs

DS3 DS4

DS2

DS1

SIG GEN SYNTH

Out-of-l o ck LEDS

RCVR SYNTH

CDMA Generator Reference Assembly Verification

1. Turn the Test Set off and remove the external cover.

2. Remove the bottom cover and verify that the cable is connected between the
EXT REF IN connector and J17 on the CDMA Generator Reference assembly.

3. Turn the Test Set on and verify that a 10 MHz signal is present on J15 of the
CDMA Generator Reference assembly.

If no signal or a poor signal appears at this connector, then the CDMA
Generator Reference assembly is faulty.

4. Remove the Reference assembly.

5. T u rn the Test Set on and verify that a 10 MHz s ignal is presen t on pin 20 o f J63
and pin 19 of J18. This is the reference signal from the CDMA Generator
Reference assembly.

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Troubleshooting

Manual Troubleshooting Procedures

If the 10 MHz s ignal is not present at all, the n the CDMA Generator Refere nce
assembly is faulty.

If the signal is present on pin 20 but not pin 19, then the Motherboard assembly is
faulty (open or short).

Reference Verification

1. Turn the Test Set off and re-install the Reference assembly.

2. Remove the Receiver Synthesizer assembly.

3. T urn the Test Set on and verify t hat a 1 MHz signal of appr oximately −1 dBm is

present on pin 3 of J21. Th is is the refere nce signal fr om the Reference
assembly.

4. If the 1 MHz signal is not present, then the Reference assembly is probably
faulty.

It is also p ossible that an open or short ed tra ce on th e mothe rboard assembly exist s.
Check the motherboard for continuity between J21 pin 3 under the Receiver
Synthesizer assembly and J18 pin 2 under the Reference assembly, and verify that
the trace is not shorted to ground.

Receiver Synthesizer Unlocked

If the 1 MHz signal is present on pin 3 of J21, then the Receiver Synthesizer
assembly is faulty.

Signal Generator Synthesizer Unlocked

1. Turn the Test Set off and remove the Signal Generator Synthesizer assembly.

2. If the signal is present, then the Signal Generator Synthesizer as sembly is
faulty.

3. Turn the Test Set on and verify that a 1 MHz signal of about −20 dBm is
present on pin 3 of J12. Th is is the refere nce signal fr om the Reference
assembly.

If the 1 MHz signal is not present, then the Reference assembly is probably faulty.
It is also possible that an open or shorted trace on the Motherboard assembly

exists. Check the motherboard for continuity between J12 pin 3 (under the Signal
Generator Synthesizer assembly) and J34 pin 1 (under the Reference assembly),
and verify that the trace is not shorted to ground.

73

Troubleshooting

Manual Troubleshooting Procedures

Swapping Known-Good Assemblies

Most swapped assemblies whi ch use calibrat ion data will operate well enoug h with
the original assembly’s calibration data to troubleshoot and to run the diagnostics;
do not expect the Test Set to meet its specifications. Some assemblies may appear
to fail because of incorr ect ca li brati on data . It is also import ant to keep track of th e
original assemblies in the Test Set. If calibration data is lost, the assembly will
have to be sent back to the factory.

Calibration data is generally stored in a daughter board’s socketed EEPROM on
the digital contro ller assembly. If the controller is replac ed or swapped, the or iginal
EEPROM must be put in the new Test Set’s controller. Should the EEPROM lose
its data, the entire instrum ent will require factory restoration.

The assemblies that require downloaded calibration data from a memory card are:

• Spectrum Analyzer (optional)

• Measurement

Swapping these assemblies may cause some performance specification failures if
the swapped in assembly's calibration data cannot be downloaded.

The assemblies that require on-board calibration loaded at the factory are:

• Downconverter

• Upconverter

• RF I/O

• Output Section

• Receiver

• Signal Generator Synthesizer

• Receiver Synthesizer

• Reference

Swapping these assemblies should not cause a performance problem, as their
calibration data resides with the assembly.

The assemblies that require a periodic calibration procedure are:

• CDMA Reference

• RF Input/Output

• LO IF/IQ Modulator

• Audio Analyzer 1

• Audio Analyzer 2

• Measurement

• Modulation Distribution

Generally, these assemblies can be swapped w i thout an im mediate need of
recalibration. In some cases though, a recalibration may be necessary to properly
troubleshoot the instr umen t.

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Troubleshooting

Manual Troubleshooting Procedures

Further Isolating RF Failures

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

Isolating failur es in t he RF as semblies of the Test Set can be dif ficult . One probl em
occurs when the diagnostics use the built-in RF analyzer to test the built-in RF
source, and vice versa. This is necessary to make the diagnostics self-contained,
that is, they run without external equipment.

Some general-purpose, RF test equipment will be needed:

• RF signal generator

• RF modulation analyzer or spectrum anal yzer.

Isolating the RF Analyzer

The RF Analyzer function uses the f oll owing assemblies. Refer to figu re 2- 19 and
the block diagrams in chapter 8, "Block Diagrams".

“Input value out of range”, will be displayed if invalid

• Downconverter

• Receiver

• Receiver Synthesizer

• Spectrum Analyzer (optional)

Figure 2-19 Isolating the RF Analyzer

Output

Attenuator

Splitter

Input

Power

Detector

RF I/O

ANT

IN

RF

IN/OUT

DUPLEX

OUT

OPP*

RPP†

Attenuator

Down

Conversion

Receiver

Synthesizer

Reference

Receiver &

IF

LO/IF

Demod

(FM, AM, SSB)

Spectrum

Analyzer

(optional)

RF Analyzer

FROM RF SOURCE

*OPP = Over Power Protection
†RPP = Reverse Power Protection

75

Troubleshooting

Manual Troubleshooting Procedures

To isolate an RF analyzer problem:

1. On the Test Set:
a. Press
b. Press the

Preset.

• Set the

• Set the

Config to access the CONFIGURE screen.

RF Display field to Freq.
RF Offset field to Off.

c. Rotate the knob to the field under anal og, press the knob and se lect RF ANL

(to go to the analog RF ANALYZER screen).

• Set the

• Set the

Tune Freq to 900 MHz.
Input Port to RF IN.

2. On the external RF signal gen erator:
a. Set the frequency to 900 MHz CW.

b. Set the amplitude to 0 dBm.
c. Connect the out put to the Test Set’s RF IN/OUT connector.

3. Set the RF signal generator’s frequency to 900 and then 1800 MHz. For each
frequency reset the

Tune Freq to that frequency. The Tes t Set’s

measurements should read as follows:

TX Power should read approximately 0.001 W for each frequency.

a.

Frequency should read 900 and 1800 MHz respectively.

b.
c. If the T est Set has the optional spectrum analyzer, press the Spec Anl key to

access the analog spec trum analyz er. Observe the level and frequency of the
signal.

76 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Isolating the RF Source

The RF generator function uses the fol lowing as semblie s. Refer to fi gure 2-20 and
the block diagrams in chapter 8, "Block Diagrams".

• LO IF/IQ Modulator

• Signal Generator Synthesizer

• Output Section

• Upconverter

Figure 2-20 Isolating the RF Source

Troubleshooting

Manual Troubleshooting Procedures

ANT

IN

RF

IN/OUT

DUPLEX

OUT

OPP

RPP

Splitter

Output

Attenuator

Input

Attenuator

Power

Detector

RF I/O

Up

Converter

Reference

Output
Section

IQ

Modulator

TO RF ANALYZER

Sig Gen

Synthesizer

RF Generator

77

Troubleshooting

Manual Troubleshooting Procedures

To isolate the RF Source:

1. On the Test Set:
a. Press
b. Press the

c. Press the
d. Set
e. Set
f. Set

Preset.

Config key to access the CONFIGURE screen.

• Set the

• Set the

RF Display field to Freq.
RF Offset field to Off.

RF Gen key (to go to the analog RF GENERATOR screen).

RF Gen Freq to 1800 MHz.
Amplitude to 0 dBm.
Output Port to Dupl.

2. On the external RF modulation analyzer or spectrum analyzer:
a. Set the tuning for the signal generated by the Test Set.

b. Connect the analyzer’s input to the Test Set’s DUPLEX OUT connector.

3. Set the Test Set’s

RF Gen Freq to 1800 MHz and then 900 MHz. For each

frequency, the external RF analyzer should read as follows:
a. Power should read approximately 0.001 W for each frequency.
b. Frequency should read 1800 and 900 MHz respectively.

78 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Service Screen

A large number of latc h and DAC settings use d throughout the Test Set can also be
read and/o r set to alter standard operation. The SERVICE screen uses the internal
voltmeter and frequency counter functions to monitor specific nodes in most
assemblies. Thes e funct ions a re pri mari ly in tended to a llow t he automa ted inter nal
diagnostic routines to verify proper inst ru me nt op er ati on, and to allow the inte rna l
periodic adjustment routines to modify Test Set operation.

Use these function s for fu rther trou bleshoo ting when t he diagnos tics ca nnot isol ate
a failure to a specif ic assembly. To do thi s, you must unde rstand how t o operate t he
Test Set and, especially, understand how the assemblies in the Test Set work
together.

To Access the SERVICE Screen

1. Press the Config key on the Test Set.

2. On the CONFIGURE screen, rotate the Test Set’s selector knob and select

SERVICE, see figure 2-21.

Troubleshooting

Service Screen

The SERVICE screen appears. For field descriptions, see "Field Names and

Descriptions".

Field Names and Descriptions

Voltmeter Connection

This field selects the des ired cir cuit n ode for volta ge measur ements. To change the
voltmeter connection, use the knob to select the
field. A
the list and push the cursor contr ol knob. The reading is di splayed in the
measurement field at th e top- left of the display.

Because the nodes being measured must be in the range of 0 to ±5 volts, the
measurement of some points are scaled to that measurement range. For example;
the +12 Volt reference (

−12 Volt reference (
Many of the voltage measurements are only valid after a number of instrument
settings are changed.

When run, the diagnostic routines make the necessary circuit changes and
measurements automatically, comparing the measurements to known limits for
each node.

Choices menu will appear . Mov e the cursor to the desi red circuit no de in

Voltmeter Connection

Voltage

MEAS_12V_REF) should measure about +5volts. The

MEAS_NEG_12V_REF) should measure about −5 volts.

Counter Connection

This field selects the desired circuit node to connect to the Test Set’s internal
frequency counter. The reading is displayed in the
field at the top right of the display.

Frequency measurement

79

Troubleshooting

Service Screen

To change the counter connection, use the knob to select the Counter

Connection

node.

Figure 2-21 Service Screen

field. A Choices menu will appear. Select the desired circuit

Gate Time

This field is used to adj ust the Test Set’s internal frequency counter’s gate time. A
shorter gate time may enable you to see frequency fluctuations that might not be
seen using a longer gate time.

To change the gate time, use the knob to select the Gate Time field. When you
select the field a flashing >> cursor is displayed. Rotate the cursor control knob
until the desired gate tim e (10 to 1000 m s in 10 ms increments) is displayed, the n
press the cursor control knob.

80 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

Troubleshooting

Service Screen

Module

This field is used to manually select the module that contains the circuit latches to
be selected.

Latch

This field is used to manually select the circuit latches in the module selected in the
Module field above. The l at ches c ont rol switch, DAC, and gain set t ings wi thi n the
Test Set. The value of the selected latch is displayed and changed in the Value
field. Some settings are read only.

To set a latch:

1. Use the knob to select the

2. Move the cursor to the desired module name and press the knob to select it.

3. Use the knob to select the

4. Move the cursor to the desired latch name and press the knob to select it.

5. Use the knob to select the

6. Rotate the curso r cont ro l knob or key in a number on the keypad to modify the
value (hexadecimal).

Module . A Choices menu will appear.

latch field. A Choices menu will appear.

Value field. A fla shing >> cursor is displayed.

Value (hex)

This field displays and changes the hexadecimal value for the latch shown in the

Latch field.

RAM Initialize

Selecting this fi el d cl ea rs all SAVE registers and t es t p rog rams, and any initia li ze d
RAM disk(s), that may be in RAM. It also resets all latches to their factory
power-up configur ation. If you have sav ed one or more instrument set ups using the
SAVE function, using this function will permanently remove them.

81

Troubleshooting

Service Screen

82 S:\agilent\e8285\ALR\Book\chapters\trouble.fm

3 Disassembly and Replaceable

Parts

This chapter contains information for the removal and replacement of
the assemblies in the Test Set. Illustrations and a parts list are
provided for parts identification.

83

Disassembly and Replaceable Parts

Before You Start

Before You Start

CAUTION Perform the proced ures in this chapter only at a static-safe work

station. The printed circuit assemblies in this inst rument are sensitive
to static electricity damage. Wear an anti-static wrist strap that is
connected to earth ground.

NOTE Test Sets with firmware revision A.04.5X and above operate only at RF

frequencies from 800 to 1000 MHz and 1700 to 2000 MHz. A text only error
message
frequencies are set.

Recommended Torque

• Screws: Tighten until just snug, use care not to strip threads.

• RF connectors –

“Input value out of range”, will be displayed if invalid

Tools

• SMA type: 9.0 lb-in. (102 N-cm)

• SMC type: 6.0 lb-in. (68 N-cm)

One or more of the following tools may be required to ac cess and remov e
Test Set’s assemblies.

• TX-10 Torx screwdriver

• TX-15 Torx screwdriver

• Flat-blade screwdriver

• 7-mm socket wrench

• 1/16-inch allen wrench

• 3/16 -i n ch so cke t wrench

• 1/4 -inch open-end wrench

• 5/16-inch open-end wrench

• 29-mm socket

84 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

Ordering Replacement Parts and Support

Repair assistance is available from the factor y by phone and email.
When calling or writing for repair assistance, please have the following
information ready:

• Instrument model number

• Instrument serial number (tag located on the rear panel).

• Installed options - if any (tag located on the rear panel).

• Instrument firmware revision - displayed at the top of the screen

when the Tes t Set is powered up, and is also displayed on the
CONFIGURE screen.

Telephone Numbers and Email

• 1-800-922-8920 Agilent Technologies Call Center

• 1-800-827-3848 (Spokane Division Service Assistance, U.S. only)

• 1-509-921-3848 (Spokane Division Service Assistance, International)

Disassembly and Replaceable Parts

Before You Start

• 1-800-227-8164 (Agilent Technologies Direct Parts Ordering, U.S.
only)

• 1-916-783-0804 (Agilent Technologies Service Parts Identification,
U.S. & International)

• 1-800-403-0801 (Agilent Technologies Instrument Support Center)

• Email: [e-mail]

Downloading Calibration Data

Most assemblies in the Test Set require calibration data. T o ensure t hat
the Test Set remains calibrated after an assembly is replaced, new
calibration data must be downloaded. When required , calibration data
is provided on a PCMCIA memory card that is included with the
replacement assembly. Refer to Table 2-2, “Relating Assemblies to

Troubleshooting Aids,” on page 70 of Chapter 2, “Troubleshooting,”to

see which modules require calibration.

85

Disassembly and Replaceable Parts

Before You Start

Calibration Data Download Procedure

1. Switch the Test Set’s power off.

2. Remove the faulty assembly.

3. Install the replacement assembly.

4. Switch the Test Set’s power on.

5. Insert the memory card.

6. Press the Tests key.

7. Set the Select Procedure Location: field to Card.

8. Set the Select Procedure Filename: field to: DNLDCAL.

9. Press the K1 key to run the test.

10.Follow the instructions on the screen.

86 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

Disassembly Procedures

This section provides instructions for dis ass embling the Test Set. The
procedures provided in this chapt er are mainly organized in sequential
order of Test Set disassembly. For component and assembly part
numbers refer to the "Par ts List" on p age 105. The callouts f or the parts
used in the following illustrations are the same as their descriptions in
the parts list.

External and Internal Covers

1. Remove the rear bumpers – two screws secure each bumper. See

Figure 3- 1.

2. Remove the strap handles (STRAP_HANDLE) from the Test Set.

3. Slide the external cover from the front frame.

4. To ac cess the top-s ide assemblies remo ve the screws secu ring the top
internal co v e rs and remove it . See Figure 3-2 on page 88.

Disassembly and Replaceable Parts

Disassembly Procedures

5. To access the bottom-side as semblies rem ove the scre ws securing t he
bottom internal cover and remove it. See Figure 3-2 on page 88.

Figure 3-1 Cover Removal

COVER_EXTERNAL

TRIM_STRIP_2

TRIM_STRIP_1
(Qty. 2)

BUMPER-REAR

AY,_STRAP_HANDLE

87

Disassembly and Replaceable Parts

Disassembly Procedures

Figure 3-2 Top and Bottom Internal Covers

DIGITAL_CVR

RF_COVER

SMM4.0_10SEMPNTX

(Qty. 20)

SMM4.0_10SEMPNTX

(Qty. 20)

HOLDDOWN_PCB

SMM4.0_10SEMPNTX

FOOT,_BOTTOM (Qty. 5)

COVER_BOTTOM

SMM4.0_10SEMPNTX

SMM4.0_10SEMPNTX

88 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

Top-Side Assemblies

1. Remove the external and internal covers , see "External and Internal

Covers" on page 87.

2. Using Figure 3-3, ide ntify the module or board assembly you wan t to
remove and lift the module or board assembly from the mother
board.

Figure 3-3 Top-Side Assemblies

REGULATOR_-KIT

DIG_CELLSITE_-KIT

ANALOG_C-SITE_KIT

DIG_CELLSITE_-KIT

PROTOCOL_PROC_-KIT

Disassembly and Replaceable Parts

Disassembly Procedures

FAN_-ASSY

DSP_-KIT

SIGNAL_SOURCE_KIT

CONTROLLER_-KIT

MEMORY_(SRBC)_KIT

MOD_DISTRIBUTION_KIT

AUDIO_ANALYZER_#1_KIT

AUDIO_ANALYZER_2_KIT

SIGGEN_SYNTH_KIT

I/Q_MOD_KIT

RF_OUTPUT_KIT

HI_STB_REFERENCE_KT

RCVR_SYNTH_KIT

GPIB/SERIAL--KIT

DISPLAY_DRIVER_KIT

MEASUREMENT_KIT

CDMA_REF_-KIT
RECEIVER_-KIT

CDMA_LO/IF_

DEMOD_KIT

SPECTRUM_

ANALYZER_KIT

89

Disassembly and Replaceable Parts

Disassembly Procedures

Audio Analyzer and Filter Assemblies

Figure 3-4 Audio Analyzer and Filter Assemblies

AUDIO_ANALYZER_1_KIT

1/4 turn to remove or

secure board.

Opt. Description
11 CCITT_FLTR
STD C_MESS_FLTR

6KHZ_BPF_#014

90 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

Disassembly and Replaceable Parts

Disassembly Procedures

Replacing the Controller

NOTE Restoring Calibration Data in Controller Assembly

Calibration data for the entire Test Set is stored in EEPROM on the
controller (C ONTROLLE R _ -KIT) assembly, see Figure 3-5. When
replacing th e controller as sembly, yo u m u st remove the “CAL
MODULE” daughter-board from the old cont roller assembly and ins tall
it onto the replacement controller ass embly to preserve the calibration
data for the instrument.

“Boot Co d e” is the firmware that initiali zes the Test Set on power-up. It
also is used at power-up to see if a firmware revision card has been
inserted in the PCMCIA card port. This code is stored in the “CAL
MODULE” daughter-board on the controller (CONTROLLER_-KIT)
assembly. If a new version of boot code needs to be installed, carefully
remove the old daughter-board and insert the new one, being careful of
the orientation. To replace the controller assembly:

1. Remove the external and internal covers , see "External and Internal

Covers" on page 87

2. Locate the controller board (see Figure 3-3 on page 89), disconnect
the ribbon cables (see Figure 3-5), and pull it out from the Test Set.

3. Carefully remove the CAL MODULE daughter-board from the
original assembly and install it on the replacement.

Figure 3-5 Controller and “CAL MODULE” Assemblies

RBN_34CNDCT_28AWG

J1

CONTROLLER_-KIT

P

2

P1

C

M

O

D

CA_AY_RBN

A

L

U

L

E

J4

J

1

0

J

1

1

(Not included in part list)

CAL MODULE

controller3.eps

91

Disassembly and Replaceable Parts

Disassembly Procedures

Batteries (Memory and Regulator Assemblies)

Figure 3-6 MEMORY_(SRBC)_KIT Assembly

MEMORY_(SRBC)_KIT

BTRY_3.0V_1AH

Figure 3-7 REGULATOR_-KIT Assembly

BTRY_3.0V_1.2AH

REGULATOR_-KIT

92 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

Bottom-Side Assemblies

1. Remove the external and internal cover, see "External and Internal

Covers" on page 87.

2. Use Figure 3-8 through Figure 3-13 to identify and rem ov e the
assembly desired.

Figure 3-8 Bottom-Side Assemblies

SR_3.58_SMA-SMA-25

Disassembly and Replaceable Parts

Disassembly Procedures

RBN-20CNDCT_28AWG-26

BRACKET_RFIO

COAXIAL_SPDT_SW

CX_F_SMB-SMB-170
CX_F_SMB-SMB-530

RBN_20CNDCT_28AWG-26

CX_A06A06_120

DNCONV_KIT

UPCONV_-KIT

Front Pa nel

RBN_20CNDCT_28AWG-40

RF/IO_KIT

SR_3.58_SMA-SMA-22

SR_2.18_SMA-SMA-24

RBN_68CNDC30AWG
CX_F_SMB-SMB-530

SR_2.18_SMA-SMA-28

PCMCIA_CARD_READER_KIT

93

Disassembly and Replaceable Parts

Disassembly Procedures

Figure 3-9 Bottom-side Subassemblies

DNCONV_KIT

UPCONV_-KIT

PCMCIA_CARD_READER_KIT

MOTHERBOARD

RF/IO_KIT

COAXIAL_SPDT_SW

CHASSIS_AY_BOX

BRACKET_RELAY

CHASSIS

NOTE: There is a combined MOTHERBOARD/CHASSIS KIT.

94 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

Downconverter Assembly

To r emove this assembly dis connect the cables , connectors , and 4 screws
shown in Figure 3-10.

Figure 3-10 Downconverter Removal

DNCONV_KIT

SR_3.58_SMA-SMA-25

J1

Disassembly and Replaceable Parts

RBN_20CNDCT_28AWG-26

J4

J3

J2

Disassembly Procedures

CX_F_SMB-SMB-170

CX_F_SMB-SMB-530

Upconverter Assembly

To r emove this assembly dis connect the cables , connectors , and 4 screws
shown in Figure 3-11.

Figure 3-11 Upconverter Removal

RBN_20CNDCT_28AWG-40

SR_2.18_SMA-SMA-28

SMM4.0-16SEMPNTX

(Qty. 4)

J4

downcnvrtr_disassembly.eps

CX_A06A6_120

UPCONV_-KIT

J3

J1

J2

SR_2.18_SMA-SMA-24

upcnvrtr_disassembly.eps

95

Disassembly and Replaceable Parts

Disassembly Procedures

RF I/O and Coaxial Switch Assemblies

To remove the RF I/O or coaxial switch assembly, or other associated
components, see Figure 3-12.

Figure 3-12 RF I/O and Coaxial Switch Assemblies R emoval

CX_F_SMB-SMB-530

RBN_20CNDCT_28AWG-26

SR_3.58_SMA-SMA-25

SR_3.58_SMA-SMA-17

SR_3.58_SMA-SMA-16

RF/IO_KIT

J5

J4

J6

J7

J1

COAXIAL_SPDT_SW

SMM4.0_10SEMPNTX
(Qty. 4)

BRACKET_RFI/O

J2

SR_2.18_SMA-SMA-24

SR_3.58_SMA-SMA-22

NOTE 1: To remov e thi s ca ble, it is necess ary
to loosen the coaxial switch.

J3

NOTE 1

SR_3.58_SMA-SMA-15

SMM3.0_18_PN_TX
(Qty. 2)

TERMINATION

SMM4.0_10SEMPNTX

(Qty. 4)

BRACKET_RELAY

rfio_disassembly.eps

96 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

PCMCIA Assembly

To rem ov e this assembly, disconnect the ribbon cable and 2 screws
securing the as se m b l y.

Figure 3-13 PCMCI A Assembly Removal

SMM4.0_10SEMPNTX

PCMCIA_CARD_READER_KIT

Disassembly and Replaceable Parts

Disassembly Procedures

RBN_68CNDC30AWG

pcmcia2.eps

97

Disassembly and Replaceable Parts

Disassembly Procedures

Motherboard Assembly

1. Remove the external and internal covers , see "External and Internal

Covers" on page 87.

2. Remove all top and bottom si de subass emblies from t he Test Set (see
previous disassembly procedures).

3. Remove the bracket relay from the chassis, see Figure 3-14.

4. Remove the screws securing the motherboard to the chassis.

Figure 3-14 Motherboard Disassembly

SMM4.0_20MML (Qty. 12)

SMM4.0_10SEMPNTX (Qty . 13)

BRACKET_RELAY

SMM4.0_10SEMPNTX (Qty. 13)

GRD_BRKT_SMB

MOTHERBOARD

SMM4.0_10SEMPNTX
(Qty. 13)

98 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm

Front Panel Assem bly

The front-panel assembly must be removed from the T est Set’s chassis
before any of the front panel subassemblies can be removed.

Disassembly and Replaceable Parts

Disassembly Procedures

1. Remove the external and internal covers , see "External and Internal

Covers" on page 87.

2. Remove the cables, BNC nuts, and 6 screws securing the front panel
frame to the Test Set’s chassis, see Figure 3-15.

3. See Figure 3-16 on page 100 to identify the desired subassembly for
removal.

Figure 3-15 Front Panel Assembly

CORE_SHIELD_BEAD_AY

,

NUT-HEX-DBL-CHAM (Qty. 3)

SMM4.0_10SEMPNTX (Qty. 6)

99

Disassembly and Replaceable Parts

Disassembly Procedures

Figure 3-16 Front Panel Subassemblies

DISPLAY_CVR_AY

RBN_10CNDCT28AWG

DISPLAY_-KIT

WINDOW-DISPLY

KNOB_ASSY_3/8

KNOB-31_DIA

RBN_50CNDCT28AWG

CA_-ASSY_SPEAKER

CBL_AY_VOL_CONT

CX_F_BNC-SMB

100 S:\agilent\e8285\ALR\Book\chapters\disassembly.fm