Agilent Technologies 8922 User Manual
Assembly Level Repair
HP/Agilent Technologies
8922 Series GSM Test Set
Agilent Part No. 08922-90213
Printed in UK
January 1998
© Copyright 1998, Agilent Technologies. All rights reserved. Reproduction, adaptation, or translation without prior
written permission is prohibited, except as allowed under the copyright laws.
Introduction
Introduction
The HP/Agilent 8922 product family uses an assembly level repair service strategy. The
HP/Agilent 8922 may be sent to an Agilent Technologies Sales and Service office or may
be repaired on site. This book is used for both Agilent Technologies service and owner
service.
The HP/Agilent 8922 product family currently contains the HP/Agilent 8922A, HP/
Agilent 8922B, HP/Agilent 8922E, HP/Agilent 8922F, HP/Agilent 8922G, HP/
Agilent 8922H, HP/Agilent 8922M and HP/Agilent 8922S. There are differences in both
the hardware and in the operation. In examples and task sequences this book presents
general usage, and graphical instrument representations may not exactly match the HP/
Agilent 8922 that you are servicing.
Repairing the HP/Agilent 8922
To repair the HP/Agilent 8922, follow the chapters in this book starting at the beginning
and following the “where to go next” guidelines.
Book Organization
This book contains problem identification sections, assembly replacement sections,
reference information and concept information. The chapters are sectioned in three parts;
Service Procedures, Reference Information and Theory. This sectioning helps to identify
the type of information found in a group of chapters.
i
Introduction
ii
Contents
1 Localizing the Problem
2 Running Diagnostics
Introduction i
Introduction 1-2
Localizing the Problem - Flow Chart (Power-Up) 1-3
Power-Up Checks 1-4
If Power-Up Checks FAILED 1-5
If Power-Up Happened Correctly 1-10
Introduction 2-2
Running Memory Card or ROM Based Diagnostics 2-3
Loading and Running the Ram Test 2-7
3 Verifying Performance
Introduction 3-2
Installing and Operating the Software 3-2
Using the Compatibility Switch for the HP/Agilent 8922F/
H or M/S 3-3
4 Using the HP/Agilent 83210A Service Kit
Introduction 4-2
Configuring the RF Extender 4-3
Extending Modules 4-5
Making Measurements 4-6
5 Troubleshooting the Controller/Display
Introduction 5-2
Parallel Bus 5-3
Serial Bus 5-4
Display 5-5
Keyboard 5-6
Contents-1
Contents
6 Troubleshooting the Power Supply
7 Adjustments and Calibration
Introduction 6-2
Power Cord Verification 6-3
Line Voltage Selection / Line Fuse Replacement 6-5
Transformer / Power Switch 6-6
A28 Power Supply 6-7
Where To Go Next 6-8
Introduction 7-2
Timebase Adjustments 7-3
Periodic Calibrations 7-5
Sum Loop Adjustment Procedure 7-6
8 Assembly and Disassembly Procedures
Introduction 8-2
Top and Bottom Cover Removal 8-3
Inside Protective Covers 8-4
AF, Digital and RF Assemblies Removal 8-5
A1 Front Panel Removal 8-7
A10 Power Supply Regulator Removal 8-9
A11 Receiver Mixer Removal 8-10
A12 Pulse Attenuator Removal 8-12
A21 GPIB Interface Removal 8-14
A22 Display Removal 8-16
A23 Input Section Removal 8-18
A24 Attenuator Removal 8-19
A28 Power Supply Removal 8-20
Fan Removal 8-22
Transformer Removal 8-24
Contents-2
Contents
9 Replacing a Part
10 Service Screen
11 Self-Test Error Messages
Introduction 9-2
Replaceable Parts 9-3
Firmware Upgrades 9-29
Introduction 10-2
Introduction 11-2
12 Module I/O Specifications
Introduction 12-2
A2 Audio Analyzer 2 12-3
A3 Audio Analyzer 1 12-5
A4 Modulation Distribution 12-8
A5 Premodulation Filter and NSM 12-10
A6 Signaling Source/Analyzer 12-13
A9 Global Test and Demod 12-15
A11 Receiver Mixer 12-19
A13 Output 12-22
A14 Pulse Driver 12-24
A15 Reference 12-26
A16 Receiver 12-32
A18 Spectrum Analyzer 12-36
A19 Measurement 12-38
A23 Input (HP/Agilent 8922A.B,E,F,G,H) Only 12-43
A23 Input (Agilent 8922M/S Only) 12-47
A25 Sum Loop 12-50
A17, A26 Step Loop 12-53
A27 DAC/Upconverter 12-56
Contents-3
Contents
13 Instrument Block Diagrams
14 Block Diagram Theory of Operation
A28 Power Supply 12-58
A33 Hop Controller 12-59
Introduction 13-2
Introduction 14-2
Technical Discussion 14-3
Block Diagram 1 14-4
Block Diagram 2 14-9
Block Diagram 3
HP/Agilent 8922B Only 14-15
Block Diagram 4 14-17
Block Diagram 5 14-18
15 Diagnostics Theory
Contents-4
Introduction 15-2
AF_DIAGS 15-3
RF_DIAGS 15-5
MS_DIAGS 15-11
GSM and DCS Diagnostic Tests 15-12
Interpreting Results 15-13
Contents
16 Measurement Theory
17 GSM Theory
Index 1
Introduction 16-2
Introduction 17-2
The GSM System 17-3
E-GSM, DCS1800 and PCS1900 Systems 17-4
Contents-5
Contents
This Page Intentionally Left Blank
Contents-6
1
Localizing the Problem
1-1
Localizing the Problem
Introduction
Introduction
This chapter helps to determine if a problem actually exists and which section of the
instrument has a problem.
This chapter comprises of four sections.
❒ Localizing the Problem Flow Chart (Power-Up)
❒ Power-Up Checks
❒ If Power-Up Failed
• Power-Up Self Test Diagnostics
❒ If Power-Up Happened Correctly
• Checking the RF Analyzer using the RF Generator
• Checking the RF Analyzer using the AF Generator
1-2
Localizing the Problem
Localizing the Problem - Flow Chart (Power-Up)
Localizing the Problem - Flow Chart (Power-Up)
See "Power Up Checks", in this Chapter, for details of the steps given in the flow chart
below.
Power On
NO
Goto;
"Troubleshooting the
Power Supply"
Goto;
"Power-Up Self Test
Diagnostics"
Failure
Reported by
Diagnostics ?
YES
Goto the relevant trouble shooting section;
NO
NO
6 seconds?
NO
NO
Controls OK?
Goto;
"If Power-Up
Happened Correctly"
Fan On?
YES
Beep after
YES
Messages
OK?
YES
Keys &
YES
• "Trouble Shooting The Controller/Display" - Chapter 5.
• "Trouble Shooting The Power Supply" - Chapter 6.
• "Running Diagnostics" - Chapter 2
Figure 1-1 Localizing the Problem - Flow Chart
1-3
Localizing the Problem
Power-Up Checks
Power-Up Checks
The following checks show whether the instrument is powering up correctly.
(a) Depress the power button on the front panel (see diagram).
(b) Check that the fan on the rear panel is working.
(c) Listen for a single “beep” after pressing the power switch. This can be from 6 to 20
seconds, depending on model type.
(d) Check the display on the front panel for any error messages. (The normal message
which will appear is “All host processor self-tests passed.” and/or "Frequency
Reference Cal lost. Perform Reference Calibration".)
(b)
(d)
(a)
Figure 1-2 Power-Up Checks - Agilent 8922x
NOTE If an error message appears after power up it may not be the only message
which has appeared. Only the last message will be shown on this message line.
Press , (MSG) to access the message screen for a list of all the
error messages.
SHIFT TESTS
(Rear Panel Vent)
(c)
"Beep"
1-4
Localizing the Problem
If Power-Up Checks FAILED
If Power-Up Checks FAILED
If the power up checks failed, continue with this section.
❒ If the fan did not start, see "Troubleshooting the Power Supply", Chapter 6.
❒ If the fan started, but any of the other power-up checks failed, see "Power-Up Self Test
Diagnostics".
❒ If an error message occurs, refer to the Agilent 8922x Users Guide for additional
information.
Error Message Numbers
If the error message refers to a self test error it will be of the form:
One or more self tests failed: Error Code XXXX
Where xxxx corresponds to the error message number shown in the table below.
Table 1-1 Error Message Numbers
Failure
Fatal Error - Host Processor Failure 0002 A7 Controller
Fatal Error - ROM Checksum Failure 0004 A8 Memory
Fatal Error - RAM Failure 0008 A8 Memory
Fatal Error - RAM Failure 0010 A8 Memory
Fatal Error - Timer Failure 0020 A7 Controller
Real Time Clock Failure 0040 A8 Memory
Keyboard Failure 0080 A1 Keyboard
Serial I/O Failure 0100 A21 GPIB
Internal Serial Bus Communication Failure 0200 Serial Bus
CRT Failure 0400 A19 CRT Drive
Miscellaneous Hardware Failure 0800 Miscellaneous H/W
Error
Number
Suspect Assembly
1-5
Localizing the Problem
If Power-Up Checks FAILED
Power-Up Self Test Diagnostics
If the power-up sequence failed, the power-up self-tests can be re-run with the covers off.
The LED’s on the controller board give the results of the power-up self-test.
(a) Remove the instrument covers. Refer to the section "Top and Bottom
Covers", Chapter 8, for details.
(b) Power up the instrument.
(c) Read the LED sequence given on the controller board. These LED’s can be
read with the shields in place (refer to the diagram below)
Location of LED’s
3210
Front Panel
(View from top)
Figure 1-3 Self Test LED Location
NOTE For multiple failures, the patterns for each failure will appear in sequence.
1-6
The following conventions are used to represent the LED’s throughout this chapter.
Table 1-2 LED Conventions
LED shown in tables Represnts
LED Sequences
The LED error sequence will show two states, pass or fail, which are outlined below. The
suspect assembly is given in the following tables, before moving on consult the section
"Self-Test Diagnostic Result".
Localizing the Problem
If Power-Up Checks FAILED
A ’lit’ LED
An ‘off’ LED
A flashing LED
No Failures
Detected The LED’s will light for approximately 10 seconds, then all will turn
off.
3210
Lit for 10 seconds.
Failure Detected 1 The LED’s will initially all light.
2 The next pattern blinks rapidly, and shows that an assembly has
failed.
3 The third sequence flashes twice and gives further information on
the area of the board that has failed.
4 The LED’s will light then go out.
1-7
Localizing the Problem
If Power-Up Checks FAILED
Table 1-3 Sequence of LED Patterns
3210
1
3210
2 Assembly failure.
3210 3210
3
3210 3210
4 No more errors.
NOTE 1. The third patterns are only documented for a serial bus communication failure. This is
represented by the two outside LED’s flashing.
2. The second and third patterns will be the same. It will appear as if the same pattern has
flashed twice.
For more than one error in the Agilent 8922x the LED’s will flash in the same sequence for
each assembly that is faulty.
Serial Bus
Communication
Failures
1-8
Localizing the Problem
If Power-Up Checks FAILED
Where to Go Next
❒ If the LED’s did not light at all, go to Chapter 6, "Troubleshooting the Power Supply".
❒ If an error messgae occurs, use it in Chapter 2, "Running Diagnostics" to choose which
diagnostic test to run. See also Chapter 11 "Self Test Error Messages".
❒ If this section is used due to display problems, go to Chapter 5 "Troubleshooting the
Controller/Display" before the error messages are repaired.
GPIB/
1-9
Localizing the Problem
If Power-Up Happened Correctly
If Power-Up Happened Correctly
If power-up happened correctly and no problem is indicated, this section is used to functionally check most of the hardware. The generators are checked first with external measurements, then the analyzers are checked with the generator. The RF Generator is
checked at 935 MHz and 10 dBm. The AF Generator is checked at 1 kHz and 1 V. These
checks are for indication only, performance tests in Chapter 3, “Verifying Performance”,
will test specifications.
NOTE If you possess an Agilent 8922S or Agilent 8922M, you should first re-configure your
instrument as an HP/Agilent 8922E or HP/8922G. To do this, select the following keys:
• CONFIG (this is accessible from the Cell Control screen in the bottom right-hand
corner).
• Compatible, select (HP 8922E or HP 8922G)
PRESET
•
Referring to Figure 1-4, ensure the connections are made.
AUDIO RF OUT
AUDIO OUT
Figure 1-4 Front Panel Connections
RF GEN/RF ANL
Press .
NOTE On the HP/Agilent 8922A/B, press .
On the HP/Agilent 8922E/F/G/H/M/S, press , (RFG/RFA).
RF GEN/RF ANL
SHIFT CELL CNTL
AF To Oscilloscope
RF To Spectrum Analayzer
1-10
Highlight the RF Output field (1).
Select AUX RF OUT from the list of choices.
Set the RF Generator Amplitude field to 10 dBm (2).
Set the AF Generator Amplitude field to 1 V (3).
Localizing the Problem
If Power-Up Happened Correctly
1
Figure 1-5 RF Analyzer Settings
2
Where to Go Next
• If the generators are within specifications, go to the next section, “Checking the RF
Analyzer Using the RF Generator”.
• If one or both of the generators appear to be faulty, go to Chapter 2, “Running
Diagnostics” and run the appropriate tests.
3
1-11
Localizing the Problem
If Power-Up Happened Correctly
Checking the RF Analyzer Using the RF Generator
This section tests the RF Analyzer using the RF Generator as a signal source. This task
assumes the same setting used in the previous section.
• Connect the RF In/Out to the Aux RF Out.
Figure 1-6 Front Panel Connections for the RF Analyzer
RF GEN RF ANL
Press .
NOTE On the HP/Agilent 8922A/B, press .
On the HP/Agilent 8922E/F/G/H/M/S, press , (RF GEN RF ANL).
RF GEN RF ANL
SHIFT CELL CNTL
1-12
If Power-Up Happened Correctly
• Set the RF Analyzer Frequency field to 935 MHz (1).
• Set the RF Analyzer Amplitude field to 10 dBm (2).
• Set the Mod Source GMSK field to Off (3).
• Select More in the bottom right-hand corner of the screen (4).
12 3
Localizing the Problem
Figure 1-7 RF Generator/Analyzer Settings
4
1-13
Localizing the Problem
If Power-Up Happened Correctly
• SelectCW/AF ANL from the list of choices, and read the CW Freq (5) and CW Power
(6) fields.
56
Figure 1-8 CW Readings
Where to Go Next
• If the analyzer measurement was within the specification, go to the next section,
“Checking the AF Analyzer using the AF Generator”.
• Ifthemeasurementwasfaulty,gotoChapter2,“RunningDiagnostics”,andrunthetest
related to the RF Analyzer.
1-14
Localizing the Problem
If Power-Up Happened Correctly
Checking the AF Analzyer Using the AF Generator
This section tests the AF Analyzer with the AF Generator as a source. The AF Generator
settings are the same as the first task, and displays the CW MEAS/AF ANL screen.
• Connect the AUDIO OUT to the AUDIO IN.
Figure 1-9 Front Panel Connections for the Audio Check
• Select More and from the list, select CW MEAS/AF ANL.
• Highlight AF Anl In and select AUDIO IN (1).
• Read the AC Level (2) and the AF Freq (3) reading.
2
1
Figure 1-10 Audio Measurements
3
1-15
Localizing the Problem
If Power-Up Happened Correctly
Where to go next
• If the analyzer measurement was within specification, go to Chapter 2, “Running
Diagnostics” and run all the tests.
• If the analyzer measurement was faulty, go to Chapter 2, “Running Diagnostics” and
run the tests relating to the AF Analyzer.
1-16
2
Running Diagnostics
2-1
Running Diagnostics
Introduction
Introduction
There are two types of diagnostics for the HP/Agilent 8922: diagnostic tests and the HP/
Agilent 8922B specific “RAM Test”. The latter is appropriate for the HP/Agilent 8922B
only. The diagnostic tests are contained either on the memory card, part number 0892210003 or in ROM memory for instruments with firmware revision code A.03.00 and
above. The HP/Agilent 8922B specific “RAM Test” is contained on the “08922-10001,
8922B Driver” disk supplied with the HP/Agilent 8922B.
Most of the diagnostic tests relate to a fault in a specific instrument section. Therefore, if
chapter 1 identified a specific section of the instrument, only those tests need to be run.
The diagnostic tests whose names begin with E or G are specifically for the HP/Agilent
8922E/G. The other tests are for any HP/Agilent 8922.
This chapter comprises two sections. The first section, “Running Memory Card or RAM
Based Diagnostics”, shows how to load and run the memory card based or ROM based
diagnostics. The second section, “Loading and Running the RAM Test”, shows how to
load and run the HP/Agilent 8922B RAM test. Equipment requirements and installation
procedures are given in the HP/Agilent 8922B User’s Guide, Part Number 08922-90020.
This chapter uses the diagnostic test names from an early memory card revision. ROM
based diagnostic test names may differ from the names used in this chapter.
2-2
Running Diagnostics
Running Memory Card or ROM Based Diagnostics
Running Memory Card or ROM Based Diagnostics
Do these steps in the order shown
1 - Press
3 Press
2 - Insert Memory Card (Optional)
TESTS
PRESET
2-3
Move cursor here and
6
press knob.
Running Diagnostics
Running Memory Card or ROM Based Diagnostics
For Memory Cards:
4
If CARD is displayed, go to step 6, if not move the cursor to this field, press knob and continue at step 5.
Move cursor here and
8
pressknob. Followthe
instructions to start.
To select another test;
• To select another tests from thesame program use
the RESUME user key.
• To select a test from another program press
TESTS key and begin at step 6.
Select CARD
5
Select,
7
AF_DIAGS,
RF_DIAGS1,
MS_DIAGS1,
CAL_REV,
LOOP_BACK
2-4
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