Agilent Technologies ESG-D Series User manual

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Service Guide
Agilent ESG-D Series Signal Generators
Serial Number Prefixes:
ESG-D1000A, US3723 and below
ESG-D2000A, US3723 and below
ESG-D3000A, US3723 and below
ESG-D4000A, US3723 and below
Part No. E4400-90014
Printed in USA
Print Date: July 1997
Copyright Hewlett-Packard Company 1997. All Rights Reserved. Reproduction, adaptation, or translation without
prior written permission is prohibited, except as allowed under the copyright laws.
1400 Fountaingrove Parkway, Santa Rosa, CA 95403-1799, USA

ii

iii
Contents
1 Initial Troubleshooting and Overall Block Diagram
Before You Begin Troubleshooting.........................................................................................1-2
Using this Service Guide to Troubleshoot...............................................................................1-3
Equipment Required for Troubleshooting...............................................................................1-4
Initial Troubleshooting.............................................................................................................1-5
Overall Block Diagram............................................................................................................1-17
Overall Block Diagram (Option 1EH).....................................................................................1-19
Overall Block Diagram (Options UN3 & UN4)......................................................................1-21
2 Assembly-Level Troubleshooting with Block Diagrams
Before You Begin Troubleshooting.........................................................................................2-2
Using the Procedures in this Chapter.......................................................................................2-3
A9 Output Board......................................................................................................................2-5
A9 Output Board Block Diagram............................................................................................2-7
A11 Reference Board ..............................................................................................................2-9
A11 Reference Board Block Diagram.....................................................................................2-11
A12 Synthesizer/Doubler Board..............................................................................................2-13
A12 Synthesizer/Doubler Board Block Diagram....................................................................2-15
A14 CPU/Motherboard............................................................................................................2-17
A14 CPU/Motherboard Block Diagram (1 of 2).....................................................................2-19
A14 CPU/Motherboard Block Diagram (2 of 2).....................................................................2-21
AT1 Attenuator/RPP Block Diagram.......................................................................................2-23

iv
Contents
A7 Baseband Generator Board Block Diagram (Option 1EH)............................................... 2-25
A7 Baseband Generator Board Block Diagram (Options UN3 & UN4) ................................2-27
A8 Data Generator Board Block Diagram (Options UN3 & UN4) ........................................ 2-29
Interconnects Block Diagram - Power Supply and Ground (1 of 2).......................................2-31
Interconnects Block Diagram - Power Supply and Ground (2 of 2).......................................2-33
Interconnects Block Diagram - Modulation and Signal (1 of 2).............................................2-35
Interconnects Block Diagram - Modulation and Signal (2 of 2).............................................2-37
3 Replaceable Parts
Ordering Information............................................................................................................... 3-2
Save Money with Rebuilt-Exchange Assemblies....................................................................3-4
Abbreviations Used in Part Descriptions.................................................................................3-6
Major Assemblies.................................................................................................................... 3-8
Cables...................................................................................................................................... 3-16
Hardware and Other Instrument Parts ..................................................................................... 3-34
Miscellaneous.......................................................................................................................... 3-56
4 Assembly Replacement
Before You Replace an Assembly........................................................................................... 4-2
Assemblies That You Can Replace..........................................................................................4-3
Instrument Cover.....................................................................................................................4-4
Front Panel............................................................................................................................... 4-6
Front Panel (Option 1EM).......................................................................................................4-10

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Contents
Rear Panel................................................................................................................................4-14
Rear Panel (Option 1EM)........................................................................................................4-18
A1 Front Panel Board..............................................................................................................4-22
A2 Display...............................................................................................................................4-24
A2DS1 Fluorescent Lamp .......................................................................................................4-26
A3 Inverter...............................................................................................................................4-28
A4 Power Supply.....................................................................................................................4-30
A4 Power Supply (Option 1EM) .............................................................................................4-34
A7 Baseband Generator Board (Option 1EH).........................................................................4-38
A7 Baseband Generator Board (Options UN3 & UN4)..........................................................4-40
A8 Data Generator Board (Options UN3 & UN4)..................................................................4-42
A9, A11, and A12 Daughterboard Card Cage Boards.............................................................4-44
A14 CPU/Motherboard............................................................................................................4-46
A14BT1 Battery.......................................................................................................................4-50
A15 Daughterboard .................................................................................................................4-52
A16 Line Module.....................................................................................................................4-56
A17 Rear Panel Interface Board (Options 1EH, UN3, UN4)..................................................4-58
AT1 Electronic Attenuator/RPP...............................................................................................4-60
B1 Small Fan Assembly ..........................................................................................................4-62
B2 Large Fan Assembly ..........................................................................................................4-64
W11, W12, and W14 Semi-Rigid Cables................................................................................4-66

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Contents
5 Post-Repair Procedures
Performance Tests.................................................................................................................... 5-2
Adjustments............................................................................................................................. 5-4
6 Error Messages
Error Messages........................................................................................................................ 6-2
Querying the Error Queue.......................................................................................................6-4
Error Numbers......................................................................................................................... 6-5
No Error................................................................................................................................... 6-6
SCPI Standard Error Messages ............................................................................................... 6-7
Command Error....................................................................................................................... 6-8
Execution Error........................................................................................................................ 6-13
Device-specific Error............................................................................................................... 6-20
Query Error..............................................................................................................................6-22
ESG-D Series Signal Generator Instrument-Specific Error Messages....................................6-24
7 Options and Accessories
Signal Generator Options........................................................................................................7
-
2
Signal Generator Accessories.................................................................................................. 7-7
Upgrade and Retrofit Kits........................................................................................................ 7-8
8 Contacting Hewlett-Packard
Before Contacting HP.............................................................................................................. 8-2

vii
Contents
Calling HP Sales and Service Offices......................................................................................8-3
Returning Your Signal Generator for Service..........................................................................8-5
Blue Repair Tags......................................................................................................................8-7
9 Safety and Regulatory
Safety Notes.............................................................................................................................9-2
General Safety Considerations ................................................................................................9-3
Lithium Battery Disposal.........................................................................................................9-4
Warranty...................................................................................................................................9-5
Assistance ................................................................................................................................9-6
Notice.......................................................................................................................................9-7
Certification.............................................................................................................................9-8
Index

viii
Contents

1-1
1 Initial Troubleshooting and Overall Block Diagram
This chapter will help you begin troubleshooting your signal generator. The procedures in this chapter
primarily check your instrument for failures that affect the power supplies or CPU function. An overall
block diagram of your signal generator is at the end of this chapter.

1-2
Initial Troubleshooting and Overall Block Diagram
Before You Begin Troubleshooting
Before You Begin Troubleshooting
Avoid Personal Injury
WARNING: These servicing instructions are for use by qualified personal only. To avoid electrical
shock, do not perform any servicing unless you are qualified to do so.
WARNING: 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.
WARNING: The detachable power cord is the instrument disconnecting device. It disconnects the
mains circuits from the mains supply before other parts of the instrument. The front
panel switch is only a standby switch and is not a LINE switch.
WARNING: The power cord is connected to internal capacitors that may remain live for 5 seconds
after disconnecting the plug from its power supply.
Prevent ESD Damage
CAUTION: Many of the assemblies in this instrument are very susceptible to damage from ESD
(electrostatic discharge). Perform service procedures only at a static-safe workstation and
wear a grounding strap.

1-3
Initial Troubleshooting and Overall Block Diagram
Using this Service Guide to Troubleshoot
Using this Service Guide to Troubleshoot
Several chapters in this service guide work together to help you troubleshoot and repair your signal
generator.
Chapter 1, “Initial Troubleshooting and Overall Block Diagram,” helps you get started with some basic checks
and instructions.
Chapter 2, “Assembly-Level Troubleshooting with Block Diagrams,” helps you identify and verify the failed
assembly.
Chapter 3, “Replaceable Parts,” will help you locate the failed assembly or cable in the 
signal generator and also provides you with part numbers and ordering information.
Chapter 4, “Assembly Replacement,” gives you step-by-step instructions on how to remove and replace an
assembly.
Chapter 5, “Post-Repair Procedures,” lists the performance tests and adjustments that must be performed after
an assembly has been repaired or replaced.

1-4
Initial Troubleshooting and Overall Block Diagram
Equipment Required for Troubleshooting
Equipment Required for Troubleshooting
The following table lists the equipment required to troubleshoot your signal generator.
Table 1-1. Recommended Test Equipment
Equipment Critical Specifications for Equipment
Substitution Recommended
Model
Digital Multimeter Input Resistance: 10 M
Accuracy: 10 mV on 100 V range HP 3458A

1-5
Initial Troubleshooting and Overall Block Diagram
Initial Troubleshooting
Initial Troubleshooting
Perform the following troubleshooting steps in the order they are presented. If you are unable to identify
the failed assembly, go to Chapter 2, "Assembly-Level Troubleshooting with Block Diagrams," for further
instruction.
NOTE: Do not attempt to replace any fuses within the power supply to correct a problem with your
signal generator. If you determine that the power supply is the failed assembly, replace the
power supply.
Step 1: Observe the Front and Rear Panel LEDs
Observing the LEDs on the front and rear panel of the signal generator will determine if there is a
catastrophic failure in the power supply assembly.
1. Ensure the signal generator is plugged in (do not switch the power on) and verify that the yellow LED on both the
front and rear panels is lit. Refer to Figure 1-1 for LED locations. A lit yellow LED (+15V_STBY) indicates that
line voltage is present.
2. Power on the signal generator and verify that the green LED on both the front and rear panels is lit. A lit green LED
indicates the power supply has received an “ON” command. The ON/OFF switch toggles a flip-flop latch which
biasesthepropertransistorsin theLED control circuit. This circuit is powered by VBAT, the battery-backed SRAM
supply, so that the on-off state is “remembered” even when the instrument is unplugged.

1-6
Initial Troubleshooting and Overall Block Diagram
Initial Troubleshooting
Figure 1-1. LED Locations on the Rear Panel

1-7
Initial Troubleshooting and Overall Block Diagram
Initial Troubleshooting
Step 2: Power On the Signal Generator and Check for Error Messages
This procedure verifies that the signal generator powers up and that the internal instrument check identifies
no errors. The internal check evaluates the correctness of operation and returns an error message if a
problem is detected.
1. Switch on the signal generator. Let the signal generator warm up for at least five minutes.
NOTE: For signal generators with Option 1E5, ERROR 514, Reference Oven Cold will
occur whenever the signal generator is powered up within five minutes of being connected
to AC line power. The OVEN COLD annunciator and the ERR annunciator will both turn
on. The OVEN COLD annunciator will automatically clear after approximately five
minutes. The error queue cannot be cleared, however, until the OVEN COLD annunciator
has turned off.
2. Cycle the power to the signal generator and verify that the green LED on both the front and rear panels is lit. Refer
to Figure 1-1.
3. When the display is lit, check to see if the ERR annunciator is turned on.
4. If the ERR annunciator is turned on, review the error messages in the queue by pressing Utility, Error Info,
View Next Error Message. The first error message in the queue will be shown in the text area of the display. Refer
to Chapter 6, "Error Messages," for descriptions of error messages.
If there is more than one error message (each message will be designated as 1 of n), continue pressing the
View Next Error Message softkey until you have seen and recorded all of the messages.
5. If you were able to resolve all of the error messages, press Utility, Error Info, Clear Error Queue(s) to delete the
list of error messages.

1-8
Initial Troubleshooting and Overall Block Diagram
Initial Troubleshooting
Step 3: Functional Check the Front Panel Keys and Display
1. Press various front panel hardkeys and softkeys to verify they function as expected.
2. Use the contrast keys to verify that the display can be lightened and darkened. Refer to Figure 1-2.
Figure 1-2. Contrast Keys

1-9
Initial Troubleshooting and Overall Block Diagram
Initial Troubleshooting
Step 4: Visually Check the Individual Voltage Supplies
1. Unplug the signal generator and remove the instrument cover. Refer to Chapter 4, "Assembly Replacement," for
removal instructions.
2. Expose the motherboard by removing the top cover. It is secured by 11 screws.
3. Plug in the signal generator and allow it to warm up for at least five minutes.
4. If possible, clear the error queue(s) of messages. Press Utility, Error Info, Clear Error Queue(s).
5. On the motherboard, locate the 10 LEDs that correspond to the individual voltage supplies (see Figure 1-3). Verify
that all the LEDs are lit. If one or more LEDs are off, proceed to Step 6: Isolate the Failed Assembly.
Figure 1-3. LED Locations on the Motherboard

1-10
Initial Troubleshooting and Overall Block Diagram
Initial Troubleshooting
Step 5: Measure the Individual Voltage Supplies
The voltages supplied as inputs from the power supply via J6 to the motherboard are +15V (TP502), +15V
standby (+15_STBY), 15 V (TP503), +12V (TP505), and +5.2V (TP302). DGND (TP301) is associated
with these supplies.
The 6V (TP508) and 5.2 (TP509) supplies receive their input from the +5.2V digital supply (5.2VD -
TP506). The +5.2V digital line is filtered to prevent the switching power supply noise from being induced
onto the +5.2VD supply lines. The 6V is a bias voltage for circuits on the output board and other RF
circuitry.The 5.2V is used by the emitter coupled logic (ECL) digital ICs. The LCD display driver voltage
(VLCD), a 14V to 24V source, also receives input from the +5.2VD supply.
The input to the +32V supply (TP504) is the +12V supply. The +32V supply is used by the synthesizer/
doubler assembly. This supply also includes an LC noise filter.
The +12.5V regulated supply (TP510) originates from the +15V input. The 12.5V regulated supply
(TP511) originates from the 15V input. These two supplies are used by the solid-state attenuator and the
reverse power protection (RPP). The +10V reference (TP501) originates from the +15V input. The +9V
supply (TP507) originates from the +10V reference and the +12V supply.
1. Unplug the signal generator and turn it upside-down.
2. Expose the motherboard by removing the bottom cover. It is secured by 15 screws.
3. Plug in the signal generator.
4. Measure the voltage of each supply to verify they are within the tolerances listed in Table 1-2. The voltage supply
test point locations are shown in Figure 1-4. If all the voltages are within tolerance, proceed to Step 7: Check for
Basic CPU Functionality.

1-11
Initial Troubleshooting and Overall Block Diagram
Initial Troubleshooting
Table 1-2. Voltage Supply Tolerances
Test Point Supply Voltage Tolerance
J6 (pins 2, 3, 12, 13) +5.2 +/3%
J6 (pin 20) +15 +/3%
J6 (pin 18) 15 +/3%
J6 (pin 19) +12 +/3%
J6 (pin 17) +15 STBY +/5%
TP301 DGND N/A
TP302 +5.2V +/3%
TP501 +10V_REF +/3%
TP502 +15V +/3%
TP503 15V +/3%
TP504 +32V +/4%
TP505 +12V +/3%
TP506 +5.2VD +/4%
TP507 +9V +/4%
TP508 6V +/4%
TP509 5.2V +/4%
TP510 +12.5V +/4%
TP511 12.5V +/4%