Agilent Technologies E8401A Troubleshooting guide

Where to Find it - Online and Printed Information
This manual is distributed as follows:
Agilent Universal Instrument Drivers CD ROM ( included with the mainframe)
World Wide Web at http://www.agilent.com/find/products
For related information:
System installation (hardware/software)............VXIbus Configuration Guide*
* Supplied with Agilent Command Module, Embedded Controllers, and VXLink
Agilent E8401A and E8403A
C-Size VXI Mainframes
User and Service Manual
75000 Series C
*E8401-90001*
Manual Part Number: E8401-90001
Printed in Malaysia E0912


Contents
Agilent E8401A, E8403A User and Service Manual
Edition 2
Contents 1
AGILENT TECHNOLOGIES WARRANTY STATEMENT..................................... 3
U.S. Government Restricted Rights..............................................................................3
Safety Symbols .............................................................................................................4
WARNINGS.................................................................................................................4
Chapter 1
Getting Started ...............................................................................................................7
Product Overview ......................................................................................................... 7
Preparing Your VXI System for Use............................................................................8
AC Power Requirements .......................................................................................8
Positioning the Mainframe for Adequate Cooling ................................................8
Connecting the
Mainframe to a Permanent Earth Ground .............................................................9
Installing VXI Instruments .........................................................................................10
Installing C-Size Instruments ..............................................................................11
Installing A- and B-Size Instruments ..................................................................12
Front Panel Features ...................................................................................................13
Diagnostic Connector .................................................................................................14
+5VC
(pin 6) ..................................................................................................................15
+12VC
(pin 7) ..................................................................................................................15
+5V STDBY
(pins 8, 21) ..........................................................................................................15
SYSRESET*
(pin 10) ................................................................................................................15
ACFAIL*
(pin 23) ................................................................................................................15
Using the Remote Power-On Pins .......................................................................16
Disabling the On/Stdby Switch ...........................................................................17
Mainframe Options and Accessories..........................................................................19
Chapter 2
Rack Mounting and Option Installation ...................................................................21
Chapter Overview.......................................................................................................21
Rack Mounting the Agilent E840xA Mainframe .......................................................21
Parts List ..............................................................................................................22
Rack Mounting the Agilent E840xA using Support Rails ..................................23
Procedure .............................................................................................................23
Rack Mounting the Agilent E840xA Using Rack Slide Rails ............................27
Procedure .............................................................................................................27
Installing the Cable Tray.............................................................................................33
Parts List ..............................................................................................................33
Procedure .............................................................................................................33

2 Contents
Installing the Tinted Acrylic Door (Option 915)........................................................35
Parts List ..............................................................................................................35
Installing the Intermodule Chassis Shields.................................................................37
Parts List ..............................................................................................................37
Procedure .............................................................................................................37
Installing the Backplane Connector Shields...............................................................39
Parts List ..............................................................................................................39
Procedure .............................................................................................................39
Agilent E840xA Air Filter Kit....................................................................................41
Chapter 3
Servicing Your Mainframe .........................................................................................43
Chapter Overview.......................................................................................................43
Problem Isolation........................................................................................................43
No Power Line Fuse ............................................................................................43
Isolating Problems ...............................................................................................44
Replacing Assemblies.................................................................................................44
Removing the Rear Panel from the Mainframe ..................................................45
Removing the Mainframe Cover .........................................................................46
Replacing the Basic Monitor Board ....................................................................47
Replacing the Agilent E8401A Power Supply ....................................................48
Replacing the Agilent E8403A Power Supply ....................................................49
Replacing the Impeller ........................................................................................50
Replacement Power Cords..........................................................................................51
Appendix A
Agilent E8401A, E8403A Product Specifications .....................................................53
Product Descriptions...................................................................................................53
General Specifications .........................................................................................53
Mechanical Specifications ...................................................................................53
Output Power Specifications ......................................................................................54
Total Available and Usable Power ......................................................................54
Peak and Dynamic Current .................................................................................54
Output Voltage Specifications ............................................................................55
Input Power Requirements..........................................................................................55
Cooling Specifications................................................................................................56
Cooling Specification Charts ..............................................................................56
Acoustical Noise Specifications .................................................................................58
Backplane Specifications............................................................................................58
Basic Monitor Specifications......................................................................................58
Environmental Specifications.....................................................................................59

3
AGILENT TECHNOLOGIES WARRANTY STATEMENT
AGILENT PRODUCT: Agilent E8401A, E8403A C Size VXI Mainframes DURATION OF WARRANTY: 3 years
1. Agilent Technologies warrants Agilent hardware, accessories and supplies against defects in materials and workmanship for the period
specified above. If Agilent receives notice of such defects during the warranty period, Agilent will, at its option, either repair or replace
products which prove to be defective. Replacement products 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 workmanship when properly installed and used. If Agilent receives notice of such defects during the warranty
period, Agilent will replace software 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 entitled 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 incidental 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) software, 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 WARRANTY OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY
QUALITY, AND FITNESS FOR A PARTICULAR PURPOSE.
8. Agilent will be liable for damage to tangible 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 such damages are determined by a court
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 EXLUSIVE 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.
U.S. Government Restricted Rights
The Software and Documentation have been developed entirely at private expense. They are delivered and licensed as "commercial
computer software" as defined in DFARS 252.227- 7013 (Oct 1988), DFARS 252.211-7015 (May 1991) or DFARS 252.227-7014 (Jun
1995), as a "commercial item" as defined in FAR 2.101(a), or as "Restricted computer software" as defined in FAR 52.227-19 (Jun
1987)(or any equivalent agency regulation or contract clause), whichever is applicable. You have only those rights provided for such
Software and Documentation by the applicable FAR or DFARS clause or the Agilent standard software agreement for the product
involved.
E8401A, E8403A C-Size VXI Mainframes User/Service Manual
Edition 2
Copyright © 1997, 1998, 2001 Agilent Technologies, Inc. All rights reserved.

4
Safety Symbols
Instruction manual symbol affixed to
product. Indicates that the user must refer to
the manual for specific WARNING or
CAUTION information to avoid personal
injury or damage to the product.
Alternating current (AC)
Instruction manual symbol affixed to
product. Indicates that the user must refer to
the manual for specific WARNING or
CAUTION information to avoid personal
injury or damage to the product.
Indicates the field wiring terminal that must
be connected to earth ground before
operating the equipment — protects against
electrical shock in case of fault.
Direct current (DC).
Indicates hazardous voltages.
or
Frameorchassis groundterminal—typically
connects to the equipment's metal frame.
WARNING Calls attention to a procedure, practice, or
condition that could cause bodily injury or
death.
CAUTION Calls attention to a procedure, practice, or
conditionthatcouldpossiblycausedamageto
equipment or permanent loss of data.
WARNINGS
The following general safety precautions must be observed during all phases of operation, service, and repair of this product. Failure to
comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and
intended use of the product. Hewlett-Packard Company assumes no liability for the customer's failure to comply with these requirements.
Ground the equipment: For Safety Class 1 equipment (equipment having a protective earth terminal), an uninterruptible safety earth
ground must be provided from the mains power source to the product input wiring terminals or supplied power cable.
DO NOT operate the product in an explosive atmosphere or in the presence of flammable gases or fumes.
For continued protection against fire, replace the line fuse(s) only with fuse(s) of the same voltage and current rating and type. DO NOT
use repaired fuses or short-circuited fuse holders.
Keep away from live circuits: Operating personnel must not remove equipment covers or shields. Procedures involving the removal of
covers or shields are for use by service-trained personnel only. Under certain conditions, dangerous voltages may exist even with the
equipment switched off. To avoid dangerous electrical shock, DO NOT perform procedures involving cover or shield removal unless you
are qualified to do so.
DO NOT operate damaged equipment: Whenever it is possible that the safety protection features built into this product have been
impaired, either through physical damage, excessive moisture, or any other reason, REMOVE POWER and do not use the product until
safe operation can be verified by service-trained personnel. If necessary, return the product to a Hewlett-Packard Sales and Service Office
for service and repair to ensure that safety features are maintained.
DO NOT service or adjust alone: Do not attempt internal service or adjustment unless another person, capable of rendering first aid and
resuscitation, is present.
DO NOT substitute parts or modify equipment: Because of the danger of introducing additional hazards, do not install substitute parts
or perform any unauthorized modification to the product. Return the product to a Hewlett-Packard Sales and Service Office for service
and repair to ensure that safety features are maintained.
Documentation History
All Editions and Updates of this manual and their creation date are listed below. The first Edition of the manual is Edition 1. The Edition
number increments by 1 whenever the manual is revised. Updates, which are issued between Editions, contain replacement pages to
correct or add additional information to the current Edition of the manual. Whenever a new Edition is created, it will contain all of the
Update information for the previous Edition. Each new Edition or Update also includes a revisedcopy of this documentation history page.
Edition 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .May 1998
Edition 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .September 2001
Edition 2 Rev 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .September 2012

5
Declaration of Conformity
Declarations of Conformity for this product and for other Agilent products may be downloaded from
the Internet. There are two methods to obtain the Declaration of Conformity:
• Go to http://regulations.corporate.agilent.com/DoC/search.htm. You can then search by
product number to find the latest Declaration of Conformity.
• Alternately, you can go to the product web page (www.agilent.com/find/E8401A), click on
the Document Library tab then scroll down until you find the Declaration of Conformity link.

6
Notes:

Getting Started 7Chapter 1
Chapter 1
Getting Started
This chapter contains general information on the operating features of the
Agilent E8401A and E8403A C-Size VXI mainframes. The following table
lists the differences between these two mainframes:
Unless otherwise specifically noted, descriptions in this manual relate to
both VXI mainframes. The designation Agilent E840xA refers to both VXI
mainframes.
Product Overview
The Agilent E840xA VXI mainframes are designed in full compliance with
VXIbus specification revision 1.4, VXIplug&play specification VPP-8, and
VMEbus system specification revision C.1. Additional features of the
Agilent E840xA mainframes include:
•Mainframe monitoring for verification of:
backplane voltage conditions
mainframe temperatures
fan and impeller operation
•State of the art cooling technology:
quiet, variable speed power supply fan and backplane impeller
increased static pressure
all fans operate at either full speed or in variable speed mode.
•Front Panel Diagnostic Connector for:
power supply voltage measurements
power supply and backplane temperature measurements
power supply fan and backplane impeller verification
•Easy maintenance:
easy rear panel access to power supply and cooling impeller
(either bench or rack mount operation).
optional air filter kit is available for harsh environments.
Power Supply
(0 °C to 55 °C)
500 W 1000 W
Basic
Monitor
Agilent E8401A Mainframe
Agilent E8403A Mainframe

8 Getting Started Chapter 1
Preparing Your VXI System for Use
The Agilent E840xA mainframes are shipped from the factory ready to use.
This section describes important mainframe installation procedures.
AC Power
Requirements The Agilent E840xA mainframes can be operated at line voltages of
90 VAC to 264 VAC, and line frequencies of 47 Hz to 66 Hz. The
mainframe can also operate at 360 Hz to 440 Hz with line voltages of
90 VAC to 132 VAC.
The mainframes ship with a power cord and with a fuse installed in the
power supply. The fuse is suitable for all line voltages, but is not accessible.
Appendix A contains complete input power specifications.
WARNING The power cord is the only way to disconnect the mainframe
from AC power and, therefore, it must be accessible to the
operator at all times. When the Agilent E840xA mainframes are
mounted in a system cabinet, the power cord need not be
accessible since the cabinet must have its own disconnect
device.
Positioning the
Mainframe for
Adequate Cooling
VXI instruments are cooled by air drawn through the back of the mainframe
and exhausted out the sides. The power supply is cooled by air drawn from
the right side (facing the mainframe) and exhausted out the left side. When
placing the mainframe on a work bench orif the mainframe is rack mounted,
provide at least a one inch clearance at the back and sides to allow for proper
air flow.
Air filters are not necessary on these mainframes. However, an optional air
filter kit (mainframe option 938 or Agilent E8401-80938) is available for
use in harsh environments. The airflow is restricted less than 10% with the
air filter installed. Refer to “Agilent E840xA Air Filter Kit” on page 41 for
installation information.

Getting Started 9Chapter 1
Connecting the
Mainframe to a
Permanent Earth
Ground
The mainframe must be connected to a permanent earth ground for line
frequencies greater than 66 Hz. This connection is made on the back of the
mainframe:
1. Connect a 16 AWG (1.3 mm or larger) wire to the PEM nut shown in
Figure 1-1. The wire must be green with a yellow stripe, or bare (no
insulation). Use a m4 x 10 screw, grounding lug, and toothed washers
(or toothed lug) as shown in the Figure.
2. Attach the other end of the wire to a permanent earth ground using
toothed washers or a toothed lug.
WARNING For protection from electrical shock when operating at
frequencies greater than 66 Hz, connect the chassis ground
terminal to permanent earth ground.
AVERTISSEMENT Risque de Choch èlectrique. Si la frèquence du secteur est
supèrieure à 66 Hz, relier la borne de masse du chassis à une
prise de terre fixe.
Figure 1-1. Connecting an Agilent E840xA Mainframe to a Permanent Earth Ground
(Agilent E8403 shown, Agilent E8401 is similar)

10 Getting Started Chapter 1
Installing VXI Instruments
The Agilent E840xA mainframes have 13 slots labeled 0 through 12. Any
VXI instrument can be installed in any slot; however, slot 0 is reserved for
devices capable of providing the system’s slot 0 functionality. This
functionality includes:
•locating instruments installed in the mainframe
•managing (arbitrating) data flow across the backplane
•providing the system clock (SYSCLK - 16 MHz)
Examples of these devices are the Agilent E1406 Command Module and
embedded controllers such as the Agilent E623x series VXI Pentium PCs,
the Agilent RADEPC7B PC, and the Agilent E1497/E1498 V743
controllers.
Multiple instruments which combine to create a virtual instrument (e.g. a
scanning multimeter), and instruments which access the backplane local bus
should be installed in adjacent slots.
1. To prevent damage to the VXI instruments, install the instruments
when power is not applied to the mainframe.
2. Insert the instrument into the mainframe by aligning the instrument
with the card guides inside the mainframe. Slowly push the
instrument into the slot until it seats in the backplane connectors. The
front panel of the instrument should be even with the front edges of
the mainframe.
3. Tighten the retaining screws on the top and bottom of the module.
WARNING All instruments within the VXI mainframe are grounded through
the mainframe chassis. During installation, tighten the
instrument's retaining screws to secure the instrument to the
mainframe and to make the ground connection.

Getting Started 11Chapter 1
Installing C-Size
Instruments Figure 1-2 shows the installation of C-Size instruments.
WARNING All instruments within the VXI mainframe are grounded through
the mainframe chassis. During installation, tighten the
instrument's retaining screws to secure the instrument to the
mainframe and to make the ground connection.
Figure 1-2. Installing C-Size Instruments in the Agilent E840xA Mainframe
seat the module by
pushing in the
extraction levers
slide the module
into the mainframe
until it plugs into the
backplane connectors
retaining
screws
extraction
levers

12 Getting Started Chapter 1
Installing A- and
B-Size Instruments Figure 1-3 shows the installation of A- and B-size instruments.
•Agilent E1403B A/B-size Module Carrier extends the P1 connector
on the VXIbus backplane and mounts the (A/B-size) modules flush
with C-size modules. This carrier is recommended for Agilent B-size,
slave-only devices which have the P1 connector.
•Agilent E1407A A/B Module Carrier extends the P1and P2
connectors on the VXIbus backplane. This carrier is recommended for
B-Size, slave-only devices which have the P1/P2 connectors.
WARNING All instruments within the VXI mainframe are grounded through
the mainframe chassis. During installation, tighten the
instrument's retaining screws to secure the instrument to the
mainframe and to make the ground connection.
Figure 1-3. Installing A- and B-Size Instruments in the Agilent E840xA Mainframe

Getting Started 13Chapter 1
Front Panel Features
Figure 1-4. Agilent E8401A and E8403A Basic Monitoring Front Panel
Section Indicator / Switch Description
Power
On Indicator
Standby Indicator
Green - the mainframe is turned on.
Amber - the mainframe is in standby mode; no power is applied to the VXI modules.
Supply
Voltages Indicator
Temp Indicator
Green - all voltages on the VXI backplane are within ±8% of the VXI specification.
Flashing Amber - one or more voltages is out of specification. The backplane voltages
and allowed variations are listed below:
Voltage Allowed Variation Diagnostic Pin
+5V +4.875V to +5.125V 1
+12V +11.64V to +12.6V 14
-12V -12.6V to -11.64V 2
+24V +23.28V to +25.2V 15
-24V -25.2V to -23.28V 3
-5.2V -5.46V to -5.044V 16
-2V -2.1V to -1.9V 4
Green - the power supply temperature is acceptable.
Flashing Amber - the power supply is approaching thermal shutdown. The power supply
temperature can be measured on pin 11 of the Diagnostic connector.
Fans
Fan Switch
Fans Indicator
Full - the power supply and mainframe cooling fans are operating at full speed.
Var(iable) - the power supply and mainframe cooling fans are providing adequate cooling
(default setting). Fan speed is a function of the power supply temperature and the
reference temperature (Diagnostic connector pin 12). The reference temperature is a
function of ambient temperature and load.
Green - the power supply and mainframe cooling fans are operating.
Flashing Amber - the power supply fan or the mainframe cooling fan is not operating. Fan
operation can be checked using pin 13 of the Diagnostic connector.
Backplane
Activity Indicator
SYSFAIL Indicator
Reset Switch
Green - there is communication between instruments across the backplane. Off - there is
no communication between instruments on the backplane.
Flashing Amber - one or more instruments has asserted its SYSFAIL line due to a
power-on initialization failure, self-test failure, or hardware failure. SYSFAIL is asserted
momentarily at power on and during a system reset.
Pressing the reset button asserts the SYSRESET* line on the VXI backplane. When
asserted (low), this line resets the VXI system; all VXI instruments are rest to their
power-on state.
Diagnostic
Connector
Refer to “Diagnostic Connector” on page 14.

14 Getting Started Chapter 1
Diagnostic Connector
The 25-pin Sub-D diagnostic connector provides access to backplane
voltages, power supply and backplane temperatures, and outputsignals. The
pins are described in Table 1-1.
Table 1-1. Diagnostic Connector Pin Descriptions
Pin # Function Description
1 +5 VM +5V backplane voltage monitor (high impedance). (+4.875 Vdc to +5.125 Vdc)
2 -12 VM -12V backplane voltage monitor (high impedance). (-12.6 Vdc to -11.64 Vdc)
3 -24 VM -24V backplane voltage monitor (high impedance). (-25.2 Vdc to -23.28 Vdc)
4 -2 VM -2V backplane voltage monitor (high impedance). (-2.1 Vdc to -1.9 Vdc)
5 Rem On Remote power on. See “Using the Remote Power-on Pins.”
6 +5 VC +5 VDC source output (1A maximum).
7 +12 VC +12 VDC source output (1A maximum).
8 +5 V Stdby Input for +5V STDBY (1A maximum for pins 8 and 21 combined).
9 GND Chassis ground.
10 SysReset * TTL low-true input signal causes system reset, output indicates system reset.
11 PS Temp Output voltage proportional to power supply temperature (0 VDC at 0 °C, with a rise of
10 mV per degree centigrade).
12 Ref Temp Output voltage proportional to backplane temperature (0 VDC at 0 °C, with a rise of 10 mV
per degree centigrade). A function of the ambient temperature and load.
At no load, Tref ~ 2 °C + ambient. At full load and high fan speed,
Tref ~ 14 °C + ambient. At full load and low fan speed, Tref ~ 20 °C + ambient.
13 Fans OK * TTL low-true output voltage indicates power supply and backplane cooling fans are
operating.
14 +12 VM +12V backplane voltage monitor (high impedance). (+11.64 Vdc to +12.6 Vdc)
15 +24 VM +24V backplane voltage monitor (high impedance). (+23.28 Vdc to +25.2 Vdc)
16 -5.2 VM -5.2V backplane voltage monitor (high impedance). (-5.46 Vdc to -5.044 Vdc)
17 GND Chassis ground.
18 REM Rtn Remote power switch return. See “Using the Remote Power-On Pins.”.
19 V OK * TTL low-true output voltage indicating the +5V, ± 12V, ± 24V, -5.2V, and -2V power supply
voltages are within ± 8% of its allowed variation.
20 GND Chassis ground.
21 +5 V Stdby Input for +5V STDBY (1A maximum for pins 8 and 21 combined).
22 GND Chassis ground.
23 ACFAIL * TTL low-true output asserted by the mainframe power monitor at power down or whenever
a loss of power is detected.
24 GND Chassis ground.
25 RSV Reserved.

Getting Started 15Chapter 1
+5VC
(pin 6) The +5 volt output allows you to power external TTL circuits if required.
The maximum current allowed from this supply is 1.0A
+12VC
(pin 7) The +12 volt output allows you to power external circuits, charge a battery,
or power relays if required. The maximum current allowed from this supply
is 1.0A
+5V STDBY
(pins 8, 21) This provides an input to the mainframe backplane for a +5V DC standby
power source. This may be from a separate battery or power supply. The
maximum current allowed is 1A total (pins 8 and 21 wired in parallel). It can
be used to power timers and other circuits when the mainframe is in standby
mode.
SYSRESET*
(pin 10) This pin provides an extension of the VXI backplane SYSRESET* signal
line. It can be used to monitor for SYSRESET* or to send a SYSRESET*
tothebackplane.Shorting this line to ground asserts the SYSRESET*signal
to the system. If you use an extension cable from the Diagnostic Connector,
make certain that you do not violate the VXI backplane electrical
specifications (i.e. keep the cable as short as possible, buffer the signal line,
etc.).
ACFAIL*
(pin 23) This pin lets you monitor the ACFAIL* signal from the VXI backplane. If
youuseanextensioncablefromthe DiagnosticConnector,make certainthat
you do not violate the VXI backplane electrical specifications (i.e. keep the
cable as short as possible, buffer the signal line, etc.).

16 Getting Started Chapter 1
Using the Remote
Power-On Pins Theremotepower-onpins(pins 5and18)oftheDiagnostic Connectorallow
you to turn the mainframe on and off without using the front panel On/Stdby
switch. With the On/Stdby switch in the Stdby (off) position, connecting pin
5 to pin 18 on the diagnostic connector turns the mainframe on.
Disconnecting pin 5 from pin 18 turns the mainframe off.
Note Pin 18 is ground in the Agilent E8401 and E8403 mainframes.
Therefore, you only need to ground pin 5 to turn the mainframe on.
Figure 1-5. Remote Standby Switch Wiring
0Resistor

Getting Started 17Chapter 1
Disabling the
On/Stdby Switch The front panel On/Stdby switch is disabled by removing surface mount 0
resistor located on the front monitor board (see Figure 1-6). The resistor is
labeled: REM PWR JUMPER.
Caution After removing the 0resistor, heat damage may prevent the
resistor from being re-installed to re-enable the On/Stdby
switch.
To access the basic monitor board and resistor:
1. Turn off the mainframe and remove the power cord.
2. Remove the rear panel. Refer to “Removing the Rear Panel from the
Mainframe” on page 45 for instructions.
3. Remove the mainframe cover by removing the 10 (five on each side)
m3x6 flat head torx screws.
Figure 1-6. Disabling the On/Stdby Switch
Location of 0resistor

18 Getting Started Chapter 1
4. Remove the 0resistor by heating both sides simultaneously with
soldering irons. Separate the resistor from the board by gently
pressing the tips of the soldering irons together.
5. Save the resistor in order to re-enable the On/Stdby switch. Again,
heat damage may prevent the resistor from being re-installed.
6. Replace the mainframe cover and rear panel. Make certain that all ten
mainframe cover screws and all 14 rear panel screws are secured.
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