Contents
HP E8401A, E8403A User and Service Manual
Edition 1
HEWLETT-PACKARD WARRANTY STATEMENT ..............................................3
Safety Symbols.............................................................................................................4
WARNINGS.................................................................................................................4
Declaration of Conformity............................................................................................5
Reader Comment Sheet ................................................................................................7
Chapter 1
Getting Started ...............................................................................................................9
Product Overview.........................................................................................................9
Preparing Your VXI System for Use ..........................................................................10
AC Power Requirements .....................................................................................10
Positioning the Mainframe for Adequate Cooling ..............................................10
Connecting the
Mainframe to a Permanent Earth Ground ...........................................................11
Installing VXI Instruments.........................................................................................12
Installing C-Size Instruments ..............................................................................13
Installing A- and B-Size Instruments ..................................................................14
Front Panel Features...................................................................................................15
Diagnostic Connector ........................................................ ......... ................................16
+5VC (pin 6) .......................................................................................................17
+12VC (pin 7) .....................................................................................................17
+5V STDBY (pins 8, 21) ....................................................................................17
SYSRESET* (pin 10) ..........................................................................................17
ACFAIL* (pin 23) ...............................................................................................17
Using the Remote Power-On Pins .......................................................................18
Disabling the On/Stdby Switch ...........................................................................19
Mainframe Options and Accessories..........................................................................21
Chapter 2
Rack Mounting and Option Installation ...................................................................23
Chapter Overview.......................................................................................................23
Rack Mounting the HP E840xA Mainframe..............................................................23
Parts List ..............................................................................................................24
Rack Mounting the HP E840xA using Support Rails .........................................25
Procedure .............................................................................................................25
Rack Mounting the HP E840xA Using Rack Slide Rails ...................................29
Procedure .............................................................................................................29
Installing the Cable Tray.............................................................................................34
Parts List ..............................................................................................................34
Procedure .............................................................................................................34
Installing the Tinted Acrylic Door (Option 915)........................................................36
Parts List ..............................................................................................................36
Installing the Intermodule Chassis Shields.................................................................38
Parts List ..............................................................................................................38
Contents 1
Procedure .............................................................................................................38
Installing the Backplane Connector Shields...............................................................40
Parts List ..............................................................................................................40
Procedure .............................................................................................................40
HP E840xA Air Filter Kit...........................................................................................42
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 HP E8401A Power Supply ...........................................................48
Replacing the HP E8403A Power Supply ...........................................................49
Replacing the Impeller ........................................................................................50
Replacement Power Cords..........................................................................................51
Appendix A
HP 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
2 Contents
HEWLETT-PACKARD WARRANTY STATEMENT
HP PRODUCT: HP E8401A, E8403A C-Size VXI Mainframes DURATION OF WARRANTY: 3 years
1. HP warrants HP hardware, accessori es and supplies against defects i n mat erials and workmanship for the period specified above. If
HP receives notice o f such defects during the warranty period, HP will, at its option, either repair or re place products which prove to be
defective. Replacement products may be either new or like-new.
2. HP warrants that HP software will not fail to execut e its programming instructions, for the period specified above, due to defects in
material and workmanship when properly installed and used. If HP recei ves notice of such defects during t he warranty period, HP will
replace software media which does not execute i ts programming instructi ons due to such defects.
3. HP does not warrant that the operation of HP products will be interrupted or error free. If HP 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. HP products may con tain remanufactured parts equivalent to new in performance o r 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 HP. If customer schedules or delays HP
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 HP, (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 HP SPECIFICALLY
DISCLAIMS ANY IMPLIED WARRANTY OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, AND
FITNESS FOR A PARTICULAR PURPOSE.
8. HP 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, an d for damages for bodily injury or death , to the extent that all such damag es are determined by a court
of competent jurisdiction to have been directly caused by a defective HP 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 HP OR ITS SUPPLIERS BE
LIABLE FOR LOSS OF DATA OR FOR DIRECT, SP ECIAL, 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 LAW FULLY PERM ITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY AND AR E
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 a s "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 t he applicable FAR or DFARS clause or the HP standard software agreement for the p r oduct involved.
HP E8401A, E8403A C -Size VXI Mainframes User/Service Manual
Copyright © 1998 Hewlett-Packard Company. All Rights Reserved.
Edition 1
3
Documentation History
All Editions and Updates of t his manu al and th eir creati on da te are list ed belo w. The first Edition of the m anual is Ed ition 1. The Edition
number increments by 1 whenever the manual is revised. Update s, which are issued between Editions , contain replacement pages t o
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 E dition. Each new Edition or Update also inc ludes a revised c opy of this do cumentation history page.
Edition 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . May, 1998
Safety Symbols
Instruction manual symbol affixed to
Instruction manual symbol affixed to
product. Indicates that the user must refer to
product. Indicates that the user must refer to
the manual for specific WARNING or
the manual for specific WARNING or
CAUTION information to av oid personal
CAUTION information to av oid personal
injury or damage to the product.
injury or damage to the product.
Indicates the field wiring te rminal that must
be connected to earth ground be fore
operating the equipment — protects against
electrical shock in case of fault.
WARNING
Alternating current (AC)
Direct current (DC).
Indicates hazardous voltages.
Calls attention to a procedure, practice, or
condition that could cause bodily injury or
death.
or
Frame or chassis ground terminal —typically
connects to the equipment' s metal frame.
CAUTION
Calls attention to a procedure, practice, or
condition that coul d possibly cause damage to
equipment or perman ent 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 Com pany 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 explo s ive atmosphere or in the presence of fl ammable 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 sw itche d off. To av oid danger ous ele ctric al sh ock, DO NOT perfor m pro cedure s inv olving cover or shi eld remova l unles s you
are qualified to do so.
DO NOT operate damaged equipmen t: 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 pr oduct 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: Becaus e of th e dang er of introd ucing addition al haz ards, do not i nstall subst itute pa rts
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.
4
Declaration of Conformity
according to ISO/IEC Guide 22 and EN 45014
Manufacturer’s Name: Hewlett-Packard Company
Loveland Manufacturing Center
declares that the product:
Product Name: HP E8401A, E8403A C-Size VXI Mainframes
Model Numbers: HP E8401A, E8403A
Product Options: All
conforms to the following Product Specifications (preliminary):
Safety: IEC 1010-1 (1990) including Amendment 2 (1996)/EN 61010-1 (1993)
CSA C22.2 #1010.1 (1992)
UL 3111-1 (1994)
EMC: CISPR 11:1990/EN55011 (1991): Group 1 Class A
EN50082-1:1992
IEC61000-4-2: 1995 4kV CD, 8kV AD
IEC61000-4-3: 1995 3V/m
IEC61000-4-4: 1995 1kV Power Line, 0.5kV Signal Lines
ENV50141: 1993/prEN50082-1 (1995): 3Vrms
EN61000-4-5: 1995 1kV CM, 0.5kV DM
EN61000-4-8: 1993/prEN50082-1 (1995): 3 A/m
EN61000-4-11: 1994/prEN50082-1 (1995): 30%, 10ms; 60%, 100ms
Supplementary Information: The 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" mark accordingly.
May 6, 1998
Jim White, Quality Manager
European contact: Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Depart-
ment HQ-TRE, Herrenberger Straße 130, D-71034 Böblingen, Germany (FAX +49-7031-14-3143)
5
Notes:
6
Pl
ease fold and tape for ma
ili
ng
Reader Comment Sheet
HP E8401A, E8403A, VXI Mainframes User and Service Manual
Edition 1
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Please list the system controller, operating system, programming language, and plug-in modules you are using.
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Chapter 1
Getting Started
This chapter contains general information on the operating features of the
HP E8401A and E8403A C-Size VXI mainf rames. The foll owing table list s
the differences between these two mainframes:
Product Overview
HP E8401A Mainframe
HP E8403A Mainframe
Power Supply
(0
°C to 55 °C)
500 W 1000 W
ää
ää
Basic
Monitor
Unless otherwise specifically noted, descriptions in this manual relate to
both VXI mainframes. The designation HP E840xA refers to both VXI
mainframes.
The HP E840xA VXI mainframes are designed in full compliance with
VXIbus specification revision 1.4, VXIpl ug&play specificati on VPP-8, and
VMEbus system specification revision C.1. Additional features of the HP
E840xA mainframes include:
•Mainframe monitoring for verification of:
n
backplane voltage conditions
n
mainframe temperatures
n
fan and impeller operation
•State of the art cooling technology:
n
quiet, variable speed power supply fan and backplane impeller
n
increased static pres sur e
n
all fans operate at either full speed or in variable speed mode.
•Front Panel Diagnostic Connector for:
n
power supply voltage measurements
n
power supply and backplane temperature measurements
n
power supply fan and backplane impeller verification
•Easy maintenance:
n
easy rear panel access to power supply and cooling impeller
(either bench or rack mount operation).
n
optional air filter kit is available for harsh environments.
Getting Started 9Chapter 1
Preparing Yo ur VXI System for Use
The HP E840xA mainframes are sh ipped from the factor y ready to use. This
section describes important mainframe installation procedures.
AC Power
Requirements
WARNING The power cord is the only way to disconnect the mainframe
Positioning th e
Mainframe for
Adequate Cooling
The HP 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 suita ble for all line vol tages, but is not accessible.
Appendix A contains complete input power specifications.
from AC power and, therefore, it must be accessible to the
operator at all times. When the HP E840xA mainframes are
mounted in a system cabinet, the power cord need not be
accessible since the cabinet must have its own disconnect
device.
VXI instruments are c ooled by air drawn through the back of the mainfra me
and exhausted out the sides . The po wer supply is cooled by air drawn fro m
the right side (facing t he mainframe) and exhausted out the lef t side. When
placing the mainframe on a work bench or if the mainframe is rack mounted,
provide at least a one inch clear ance at the back a nd sides to all ow for proper
air flow.
Air filters are not necessary on these ma inf ra mes. However, an optional air
filter kit (mainfr ame opti on 938 or HP E8401-80 938) is avail able f or use i n
harsh environments. The airflow is restricted less than 10% with the air filter
installed. Refer to “HP E840xA Air Filter Kit” on page 42 for installation
information.
10 Getting Started Chapter 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 sho wn in
Figure 1-1. The wire must be green with a yellow stripe, or bare (no
insulation). Use a m4 x 10 s crew, grounding lug, and toothed wash ers
(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.
Figure 1-1. Connecting an HP E840xA Mainframe to a Permanent Earth Ground
(HP E8403 shown, HP E8401 is similar)
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.
Getting Started 11Chapter 1
Installing VXI Instru ments
The HP 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
functionali ty 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 HP E1406 Command Module and
embedded controllers such as the HP E623x series VXI Pentium PCs, the
HP RADEPC7B PC, and the HP E1497/E1498 V743 controllers.
Multiple instruments which combine to create a virtual instrument (e.g. a
scanning multimeter), and i nstruments which access th e 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 in to the mainframe by aligning the instrument
with the card guides inside the mainframe. Slowly push the
instrument in to th e slot until it seats in the bac kplane connectors. The
front panel of the instrument should be even with the front edges of
the mainfram e.
3. Tighten the retaining screws on the top and bottom of the module.
WARNING All instruments withi n the VXI mainf rame are grounded through
the mainframe chassis. During insta llation, tighten the
instrument’ s retaining screws to secure the instrument to the
mainframe and to make the ground connection.
12 Getting Started Chapter 1
Installing C-Size
Instruments
Figure 1-2 shows the installation of C-Size instruments.
retaining
screws
extraction
levers
seat the module by
pushing in the
extraction levers
slide the module
into the mainframe
until it plugs into the
backplane co nnectors
Figure 1-2. Installing C-Size Instruments in the HP E840xA Mainframe
WARNING All instruments withi n the VXI mainf rame are grounded through
the mainframe chassis. During insta llation, tighten the
instrument’ s retaining screws to secure the instrument to the
mainframe and to make the ground connection.
Getting Started 13Chapter 1
Installing A- and
Figure 1-3 shows the installation of A- and B-size instruments.
B-Size Instruments
•HP 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 Hewlett-Packard
B-size, slave-only devices which have the P1 connector.
•HP 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.
Figure 1-3. Installing A- and B-Size Instruments in the HP E840xA Mainframe
WARNING All instruments withi n the VXI mainf rame are grounded through
the mainframe chassis. During insta llation, tighten the
instrument’ s retaining screws to secure the instrument to the
mainframe and to make the ground connection.
14 Getting Started Chapter 1
Front Panel Features
Section Indicator / Switch Description
Power
ô
Supply
On Indicator
Standby Indicator
Voltages Indicator
Green - the mainframe is turned on.
Amber - the mainframe is in standby mode; no power is applied to the VXI modules.
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
í
Fans
÷
Backplane
û
Diagnostic
Connector
Temp Indicator
Fan Switch
Fans Indicator
Activity Indicator
SYSFAIL Indicator
Reset Switch
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.
Full - the power supply and mainframe cooling fans are operating at full speed.
Var(iable) - the power supply and mainframe cooli ng 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.
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.
Refer to “Diagnostic Connector” on page 16.
Figure 1-4. HP E8401A and E8403A Basic Monitoring Front Panel
Getting Started 15Chapter 1
Diagnostic Connector
The 25-pin Sub-D diagnostic connector provides access to backplane
voltages, power supply and backp lane temperatures, and out put signals. The
pins are described in Table 1-1.
13
25
12
24
11
23
5
8910
2122
6
7
181920
17
3
4
15
16
1
2
14
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 T emp 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, T
T
~ 14 °C + ambient. At full load and low fan speed, T
ref
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
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
24 GND Chassis ground.
25 RSV
voltages are within ± 8% of its allowed variation.
a loss of power is detected.
Reserved.
~ 2 °C + ambient. At full load and high fan speed,
ref
ref
~ 20 °C + ambient.
16 Getting Started Chapter 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)
+5V STDBY
(pins 8, 21)
SYSRESET*
(pin 10)
ACF AIL*
(pin 23)
The +12 volt output all ows you t o power ex tern al cir cuits , charge a batt ery,
or power relays if requir ed. The maximum cur rent allowed fro m this supply
is 1.0A
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 to tal (pins 8 and 21 wired in para llel). It can
be used to power timers and other ci rcuits when the mainframe is in standby
mode.
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*
tot he backplane. Shorting this lin e to ground asser ts the SYSRESET* sig nal
to the system. If you u se an exte nsion cabl e from the Diagnosti c Connector ,
make certain that you do not violate the VXI backplane electrical
specifications (i .e. keep the cab le as short as possible, buffer the sig nal line,
etc.).
This pin lets you monitor the ACFAIL* signal from the VXI backplane. If
you use an extension cable f rom the Diagnostic Connector , make certain that
you do not violate the VXI bac kplane elect rica l speci fica tions (i.e. ke ep th e
cable as short as possible, buffer the signal line, etc.).
Getting Started 17Chapter 1
Using the Remote
Power-On Pins
Resistor
The remote power-on pins ( pins 5 and 18) of the Diagn ostic Connector allow
you to turn the mainf rame on and off without using t he front panel On/Stdby
switch. With the On/ Stdby switch in the Stdby (off ) position, co nnecting pin
5 to pin 18 on the diagnostic connector turns the mainframe on.
Disconnecting pin 5 from pin 18 turns the mainframe off.
Ω
0
Figure 1-5. Remote Standby Switch Wiring.
Note Pin 18 is ground in the HP E8401 and E8403 mainframes. Therefore,
you only need to ground pin 5 to turn the mainframe on.
18 Getting Started Chapter 1
Disabling the
On/Stdby Switch
The front panel On/Stdby s witch is disa bled by removing surface mount 0Ω
resistor located on the front monitor board (see Figure 1-6). The resistor is
labeled:
REM PWR JUMPER.
Location of 0Ω resistor
Figure 1-6. Disabling the On/Stdby Switch
Caution After removing the 0
resistor from being re-inst alled 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 re ar panel. Refer to “Removing the Rear Pan el 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.
Ω
resistor, heat damage may prevent the
Getting Started 19Chapter 1
4. Remove the 0Ω resistor 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 c over a nd rea r panel . Make ce rtai n that all ten
mainframe cover screws and all 14 rear panel screws are secured.
20 Getting Started Chapter 1
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