The information in this document is subject to change without notice and should
not be construed as a commitment by Digital Equipment Corporation. Digital
Equipment Corporation assumes no responsibility for any errors that may appear
in this document.
The software described in this document is furnished under a license and may
be used or copied only in accordance with the terms of such license.
No responsibility is assumed for the use or reliability of software on equipment
that is not supplied by Digital Equipment Corporation or its affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U. S. Government is
subject to restrictions as set forth in subparagraph (c) ( 1) (ii) of the Rights in
Technical Data and Computer Software clause at DFARS 252.227–7013.
FCC NOTICE: The equipment described in this manual has been certified to
comply with the limits for a Class B computing device, pursuant to Subpart
J of Part 15 of FCC Rules. Only peripherals (computer input/output devices,
terminals, printers, etcetera) certified to comply with the Class B limits may be
attached to this computer. Operation with noncertified peripherals may result
in interference to radio and television reception. This equipment generates and
uses radio frequency energy and if not installed and used properly, that is, in
strict accordance with the manufacturer’s instructions, may cause interference to
radio and television reception. It has been type tested and found to comply with
the limits for a Class B computing device in accordance with the specifications
in Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference in a residential installation. However, there
is no guarantee that interference will not occur in a particular installation. If
this equipment does cause interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
–Reorient the receiving antenna.
–Move the computer away from the receiver.
–Plug the computer into a different outlet so that computer and receiver are
on different branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television
technician for additional suggestions. The user may find the following booklet
prepared by the Federal Communications Commission helpful: How to Identifyand Resolve Radio-TV Interference Problems. This booklet is available from the
US Government Printing Office, Washington, DC 20402, Stock No. 004–000–
00398–5
Page 3
The following are trademarks of Digital Equipment Corporation:
DECDIBOLUNIBUS
MS-DOS is a registered trademark of Microsoft Corporation.
Velcro is a trademark of VELCRO USA Inc.
IBM and IBM-PC/AT are registered trademarks of International Business
Machines Corporation.
Intel is a trademark of Intel Corporation.
This document was prepared and published by Educational Services Development
and Publishing, Digital Equipment Corporation.
3–1DECstation Standard Field Replaceable Units ...........3–1
3–2DECstation Optional Field Replaceable Units ............3–2
3–3212LP Main Logic Board Jumper Settings ............... 3–35
3–4316SX Main Logic Board Jumper Settings ............... 3–37
3–5DECstation 316SX Main Logic Board Switch Settings ...... 3–39
3–6320SX Main Logic Board Jumper Settings ............... 3–41
3–7DECstation 320SX Main Logic Board Switch Settings ...... 3–43
A–1DECstation Base System Power Consumption ............ A–1
B–1Parallel I/O Port Connector . . ........................B–1
B–2RS-232C Serial Port Connector ....................... B–2
B–3Keyboard and Mouse Connectors ......................B–2
B–4Video Port Connector ............................... B–3
Page 8
AboutThisGuide
This service guide is designed to help you diagnose and repair
the DECstation 212LP, DECstation 316SX and DECstation
320SX personal computers. This guide contains information on
servicing the base system only. Specific information on installing,
replacing, and configuring options is covered in the individual
option installation guides supplied with those products and is
available to Customer Service personnel in a kit.
Guide Organization
The guide is organized as follows:
•Chapter 1 provides an overview of the DECstation systems.
•Chapter 2 details troubleshooting instructions.
•Chapter 3 contains procedures for removing and replacing
field replaceable units.
For information about network troubleshooting, refer to the PCSANetwork Troubleshooting Guide. For additional information about
PC architecture and the Digital Ethernet Personal Computer Bus
Adapter (DEPCA) and DEC EtherWORKS option boards, refer to
the appropriate Service Guides.
Intended Audience
The procedures in this guide are for service technicians trained
only by Digital Equipment Corporation.
vii
Page 9
viii About This Guide
Conventions
This document uses the following conventions:
ConventionMeaning
WarningProvides information to prevent
CautionProvides information to prevent
NoteProvides general information you
Ctrl Alt Del
Strike the F1 keyWhat the screen displays as a
personal injury
damage to equipment
should be aware of
Alt
Ctrl
and
while you
Del
. Control
Press and hold
press both
key sequences have special
functions.
prompt or an instruction is shown
in monospaced type.
Throughout this guide, DECstation refers to the DECstation
212LP, DECstation 316SX, and the DECstation 320SX. When
information applies to a specific DECstation, the full title is used.
The computer industry recognizes two open architectures as
industry standards: the IBM-PC/AT bus structure and the
Microsoft disk operating system, MS-DOS. The term industrystandard refers to compatibility with these architectures. Support
for MS-DOS requires a defined set of ROM-BIOS (read-only
memory basic I/O system services) which the DECstation offers.
Ordering Parts
Customers who maintain their own equipment can order spare
parts by either phone or mail, or through any Digital sales office.
To order parts by phone, call 1-800-DIGITAL from 8:30 am to 8:00
pm (Eastern Standard Time).
To order parts by mail, send a purchase order to Digital
Equipment Corporation, P.O. Box CS2008, Nashua NH 03061.
Page 10
About This Guide ix
Related Documentation
The following related documents are available as supplements to
the information provided in this guide.
Digital personnel may order documents with part numbers
beginning with either ER or EK from:
Digital Equipment Corporation
444 Whitney Street
Northboro, MA 01532
Attn: Publishing and Circulation Services (NRO2-2) Order
Processing Section
On-line orders can be sent ALL-IN-1 mail to Order @NRO or VMS
mail to NEST::ORDER.
Page 11
x About This Guide
Digital personnel may order documents with part numbers
beginning with AA from:
Digital Equipment Corporation
Digital Drive
Westminster MA 01473-0471
Attn: Attention: Order Administration
Digital self-maintenance customers may order documents with
part numbers beginning with either EK, ER, or AA by mail or
phone from:
Digital Equipment Corporation
Peripherals and Supplies Group
P.O. Box CS2008
Nashua, NH 03061
Or, by phone, between 8:30am and 8:00pm Eastern Standard
Time, call:
1-800-DIGITAL
Page 12
1
Overview
1.1Introduction
The DECstation (Figure 1–1) is a desktop computer. It can
be used as a standalone personal computer or as a node on a
network to a VAX computer or another DECstation with network
server software. The DECstation runs Digital and other industrystandard applications.
LJ-1713
Figure 1–1DECstation Personal Computer
1–1
Page 13
1–2 Overview
As a node on a Personal Computing System Architecture
(PCSA) network, the DECstation is the user’s interface with
the applications and services that the PCSA family of products
provides. As part of a network, the DECstation communicates
with other computers on the network and shares the various
resources and services offered by Digital computers and servers.
1.2DECstation Base System
The DECstation base system unit consists of the following:
Intel 80387SX (DECstation 316SX only) math coprocessor
— Socket for optional 386SX math coprocessor
— 1 (minimum) to 4 (maximum) Mbytes of SIMM RAM
memory
— Serial and parallel ports
— PS/2 compatible mouse port
— Intelligent Drive Electronics (IDE) drive connector
— 16-bit VGA (Video Graphics Array) controller on the main
logic board.
— Three 16-bit (also usable as 8-bit) expansion slots for
industry standard options
•100 watt power supply with auxiliary power output (IEC)
connector
•3.5 inch 1.44 Mbyte diskette drive
Page 14
Overview 1–3
1.3DECstation Options
The following are options available for the DECstation base
system:
•Color or monochrome VGA analog monitor
•40, 80, 170, or 320 Mbyte SCSI hard disk drive
•150 Mbyte SCSI Tape cartridge system
•20, 40, 120, or 105 Mbyte IDE hard disk drive
•60 Mbyte streaming tape drive (QIC-40)
•8514/A-Compatible Graphics Adapter
•3.5 inch 1.44 Mbyte diskette drive
•5.25 inch 1.2 Mbyte diskette drive
•5.25 inch 360 Kbyte diskette drive
•101-key enhanced keyboard (country-specific)
•PS/2 compatible mouse
•Power cord (country-specific)
•16-bit SCSI host adapter
•Serial/parallel adapter
•1200/300 internal baud modem
•2400 internal baud modem
•10 MHz Intel 80287 math coprocessor (DECstation 212LP)
•16 MHz Intel 80387SX math coprocessor (DECstation 316SX)
•20 MHz Intel 80387SX math coprocessor (DECstation 320SX)
•DEC EtherWORKS bus adapter
NOTE
Options listed were available at the time of printing.
Additional options may be available at this time.
Page 15
1–4 Overview
1.3.1 System Unit Layout
Figure 1–2 shows the location of both standard and optional
equipment within the system unit. Standard equipment (the
equipment that is included in the base system) is represented by
solid lines. Optional equipment is represented by dotted lines.
LJ-1712
Figure 1–2System Unit Layout
1.4DECstation System Configurations
The DECstation personal computers are each available in two
base system configurations (115 or 230 Vac). These systems
are available for customers who elect to purchase DECstation
supported options separately and configure their own systems.
Page 16
Overview 1–5
Additionally, customers can order one of several packaged systems
which offer optional system memory configurations, mass storage
devices and video adapters installed at the factory. The base
system configurations are listed in Table 1–1. The packaged
systems are listed in Table 1–2.
Table 1–1 Base System Configurations
Model
NumberDescription
PC441-AADECstation 212LP; 80286/12 MHz base system box, 1
PC441-A2Same as PC441-AA, but with no power cord and
PC441-A3Same as PC441-A2, but with no power cord and
PC442-A2DECstation 316
PC442-A3Same as PC442-A2, but with the power supply factory
PC443-A2DECstation 320
Mbyte (minimum) SIMM RAM, 3.5 inch 1.44 Mbyte
floppy diskette drive, on-board IDE device interface,
serial/parallel port, mouse and keyboard port, on-board
VGA, 3 PC/AT expansion slots (full size), 2 additional
front panel storage bays (3.5 and 5.25 inch), with the
power supply factory set at 120 Vac, 60 Hz.
keyboard.
keyboard, and is factory set at 240 Vac, 50 Hz.
SX; 80386/16 MHz base system box, 1
Mbyte (minimum) SIMM RAM, 3.5 inch 1.44 Mbyte
floppy diskette drive, on-board IDE device interface,
serial/parallel port, mouse and keyboard port, 3 PC/AT
expansion slots (full size), 2 additional front panel
storage bays (3.5 and 5.25 inch), with the power
supply factory set at 120 Vac, 60 Hz. No power cord or
keyboard.
set at 240 Vac, 50 Hz.
SX; 80386/16 MHz base system box, 1
Mbyte (minimum) SIMM RAM, 3.5 inch 1.44 Mbyte
floppy diskette drive, on-board IDE device interface,
serial/parallel port, mouse and keyboard port, on-board
SVGA, 3 PC/AT expansion slots (full size), 2 additional
front panel storage bays (3.5 and 5.25 inch), with the
power supply factory set at 120 Vac, 60 Hz. No power
cord or keyboard.
Page 17
1–6 Overview
Table 1–1 (Cont.) Base System Configurations
Model
NumberDescription
PC443-A3Same as PC443-A2, but with the power supply factory
set at 240 Vac, 50 Hz.
1.4.1 DECstation 212LP Main Logic Board
The DECstation 212LP main logic board contains a 12 MHz Intel
80286 CPU microprocessor, a socket for an optional Intel 80287
math coprocessor, floppy disk drive controller, serial and parallel
ports, PS/2 compatible mouse port, IDE drive connector, 16-bit
VGA controller (800 x 600), four SIMM memory expansion slots,
and one bus expansion adapter connector. The bus expansion
adapter plugs into the main logic board and contains three 16-bit
(also usable as 8-bit) expansion slots.
1.4.2 DECstation 316SX Main Logic Board
The DECstation 316SX main logic board contains a 16 MHz Intel
80386 CPU microprocessor, a socket for an optional Intel 80387SX
math coprocessor, floppy disk drives controller, serial and parallel
ports, PS/2 compatible mouse port, IDE drive connector, 16-bit
VGA controller (800 x 600), four SIMM memory expansion slots,
and one bus expansion adapter connector. The bus expansion
adapter plugs into the main logic board and contains three 16-bit
(also usable as 8-bit) expansion slots.
1.4.3 DECstation 320SX Main Logic Board
The DECstation 320SX main logic board contains a 20 MHz Intel
80386 CPU microprocessor, a socket for an optional Intel 80387SX
math coprocessor, floppy disk drives controller, serial and parallel
ports, PS/2 compatible mouse port, IDE drive connector, Super
VGA controller (1024 x 768) with 512 Kbytes, 1 Mbyte system
RAM (fixed) with four SIMM video memory expansion slots, and
one bus expansion adapter connector. The bus expansion adapter
plugs into the main logic board and contains three 16-bit (also
usable as 8-bit) expansion slots.
Page 18
Overview 1–7
1.4.4 Power Supply
The DECstation is supplied with a 100 watt power supply that
includes an auxiliary ac power output (IEC) connector. The power
supply is switch selectable between either 115 Vac, 60 Hz or 230
Vac, 50/60 Hz power input.
1.4.5 Monitors
The DECstation supports both color and monochrome VGA
analog monitors. The monitors are available in different voltage
input variations and video alignments to meet international
requirements. See Table 2–7.
Table 1–2 Monitors
Model
NumberPart NumberDescription
PC4XV-AA30-32317-01VGA monochromatic 14" for all
PC4XV-A230-32317-01VGA monochromatic 14"
PC4XV-A330-32319-01VGA monochromatic 14"
PC4XV-A430-32320-01VGA monochromatic 14"
versions of DECstation personal
computers. Requires PC4XG-AA
or -AB VGA adapter, except on the
PC44- models. Displays 64 shades
of grey, 640 x 480 resolution. 120
Vac 60 Hz (US and Canada)
international version, 120 Vac
60 Hz, with 640 x 480 resolution,
North Hemisphere (IEC plug)
international version, 240 Vac
50 Hz, with 640 x 480 resolution,
North Hemisphere (IEC plug)
international version, 240 Vac
50 Hz, with 640 x 480 resolution,
South Hemisphere (IEC plug)
Page 19
1–8 Overview
Table 1–2 (Cont.) Monitors
Model
NumberPart NumberDescription
PC4XV-A530-32318-01VGA monochromatic 14"
PC4XV-A630-33966-01VGA monochromatic RGB 14"
PC4XV-A730-33967-01VGA monochromatic RGB 14"
PC4XV-BA30-30901-01VGA color RGB 14" for all versions
PC4XV-B230-32313-01VGA color RGB 14" international
PC4XV-B330-32315-01VGA color RGB 14" international
PC4XV-B430-32316-01VGA color RGB 14" international
PC4XV-B530-32314-01VGA color RGB 14" international
international version, 120 Vac
60 Hz, with 640 x 480 resolution,
South Hemisphere (IEC plug)
international version, 240 Vac 50
Hz, with 640 x 480 resolution,
North Hemisphere (IEC plug)
international version, 240 Vac 50
Hz, with 640 x 480 resolution,
South Hemisphere (IEC plug)
of DECstation personal computers.
Requires PC4XG-AA or -AB VGA
adapter, except on the PC44models. Displays at 640 x 480
colors. 120 Vac 60 Hz (US and
Canada)
version, 120 Vac 60 Hz, with 1024 x
768 resolution, North Hemisphere
(IEC plug)
version, 240 Vac 50 Hz, with 640 x
480 resolution, North Hemisphere
(IEC plug)
version, 240 Vac 50 Hz, with 640 x
480 resolution, South Hemisphere
(IEC plug)
version, 120 Vac 60 Hz, with 1024 x
768 resolution, South Hemisphere
(IEC plug)
Page 20
Table 1–2 (Cont.) Monitors
Model
NumberPart NumberDescription
Overview 1–9
PC4XV-B630-33968-01SVGA color RGB 14" international
PC4XV-B730-33969-01SVGA color RGB 14" international
version, 240 Vac 50 Hz, with 1024 x
768 resolution, North Hemisphere
(IEC plug)
version, 240 Vac 50 Hz, with 1024 x
768 resolution, South Hemisphere
(IEC plug)
1.4.6 Enhanced Keyboards
There are two different keyboards available as options on the
DECstation: The 101-key enhanced keyboard and the LK250
keyboard.
NOTE
Keyboards used with the DECstation 212LP, DECstation
316SX, and DECstation 320SX must be equipped with a 6-pin
miniature PS/2 compatible connector.
1.4.6.1 101-Key Enhanced Keyboard
The 101-key enhanced keyboard provides the industry-standard
IBM-PC/AT-style key arrangement on a smaller, desktop keyboard.
1.4.6.2 LK250 Keyboard
The LK250 keyboard provides the standard Digital key
arrangement available in several country-specific language
variations.
Page 21
1–10 Overview
1.4.7 Math Coprocessor
The math coprocessors listed in Table 1–3 plug into the main logic
board and allow each DECstation to process numeric data faster.
Table 1–3 Math Coprocessors
Model
NumberDescription
PC44P-AA10 MHz optional Intel 80287 coprocessor for the
DECstation 212
LP
PC46P-BB16 MHz optional Intel 80387 coprocessor for the
DECstation 316
SX
PC44P-CC16 MHz optional Intel 80387sx coprocessor for the
DECstation 320
SX
Page 22
Troubleshooting
This chapter provides troubleshooting instructions for the
DECstation systems. It is divided into the following sections:
•Special tools
•Diagnostics
•Normal power up
•Troubleshooting procedures
•Error codes and how to use them
•Troubleshooting by symptom
•Troubleshooting during system operation
•Using the System Utilities diskette
For information about jumper settings, troubleshooting, and
servicing of the DEC EtherWORKS option board and related
network connections refer to the DEC EtherWORKS ServiceGuide.
2
2.1Special Tools
The special tools needed to troubleshoot the DECstation system
are given in Table 2–1.
2–1
Page 23
2–2 Troubleshooting
Table 2–1 Troubleshooting Tools
ToolPart NumberDefinition
Diagnose
Diagnostics
Tri-wrap
Loopback
Connector
DECstation
LP Utilities
212
Diskette
DECstation
SX Utilities
316
Diskette
DECstation
SX Utilities
320
Diskette
29-27462-01These standalone diagnostics
are available separately. For
information about using
these diagnostics, refer to
the accompanying manual.
FD-10164-00This triple connector consists
of a male 25-pin parallel
loopback connector, a female
25-pin serial loopback
connector, and a female 9pin serial loopback connector
bundled together and housed
in a streamlined package.
29-28243-01Use to reconfigure the CPU
when options are installed.
29-28111-01Use to reconfigure the CPU
when options are installed.
29-28854-01Use to reconfigure the CPU
when options are installed.
2.2Diagnostics
The DECstation has internal ROM-based diagnostics to aid in
troubleshooting. These diagnostics are run at system power-up
and verify the operation of the machine. Error messages are given
in two formats: beep codes and message displays on the screen.
These error messages are explained in Section 2.5.
Page 24
Troubleshooting 2–3
2.3Normal Power Up
In a normal system power up the following takes place.
1. Power to the monitor and system unit is turned on. Both
power indicators are on.
2. The system executes its power-up tests, displays the BIOS
ROM version, assorted copyright information, and the memory
size. Depending on the option(s) installed in the system
additional information may be displayed.
If there is an error during any of the power-up tests the
system either generates a beep error code or displays an error
message.
3. The system generates a single beep, displays information
about the operating system, and gives the date prompt. Note
that the actual information displayed at this time depends on
the system software.
2.4Troubleshooting Procedures
This section describes three troubleshooting procedures that can
be used depending on the state of the system. Each procedure will
get the system to a state where it can run the Diagnose diagnostic
package. Perform the steps in Section 2.4.1 and then go to the
recommended procedure.
CAUTION
Before troubleshooting the DECstation, it must be
disconnected from any network.
Page 25
2–4 Troubleshooting
2.4.1 Getting Started
The following steps prepare you for troubleshooting a DECstation.
1. Ask the customer to describe the problem. You need to find
out:
— When the problem started
— If any new hardware options were added to the system
around the time the problem started and if the options are
Digital certified or third party
— If any new software was added to the system
2. Have the customer supply you with a copy of the operating
system diskette(s) that came with the system.
3. Have the customer provide you with the system
configuration.
— Type of monitor
— Type of keyboard
— Type and number of disk drives
— Type and amount of memory
— Type of network adapter
— Type of mouse
— Type of disk adapter (if on-board disk adapter is disabled)
— Type of video graphics adapter (if on-board VGA is
disabled)
— Any other options installed in the system
4. Observe the problem. Based on what you observe refer to one
of the following procedures:
— If the system does not power up see Section 2.4.2, No
Power.
— If the system powers up but will not boot see Section 2.4.3,
System Does Not Boot.
Page 26
Troubleshooting 2–5
— If the system powers up and boots see Section 2.4.4,
System Boots.
2.4.2 No Power
This procedure is to help determine the cause of the problem when
the DECstation does not power up. Before starting this procedure
be sure you have done the steps in Section 2.4.1.
1. Check the system for loose cables and connections.
2. Check the 115/230 Vac switch on the back of the system unit.
3. Plug the system unit and monitor power cord into a working
ac outlet.
4. Turn on power to the monitor and system unit. Check for
system power. The following are indications that the system
and monitor have powered up:
— Power indicators on the system unit and monitor are on.
— You can hear the fan running.
— You can hear the hard disk spinning.
5. If the system does not power up:
a. Turn off power to the system unit and monitor.
b. Unplug the system and monitor from the ac outlet.
c.Disconnect power to all the hard disk drives and remove
all options.
d. Plug the monitor and system into a working ac outlet.
e. Turn the monitor and system power on. If the system
powers up there was either a faulty device, too many
options installed, or another power related problem.
f.Try booting the system from the operating system startup
diskette.
g. Replace the Digital certified options one at a time and see
if the system powers up each time an option is replaced or
a disk drive is reconnected.
Page 27
2–6 Troubleshooting
6. If the system powers up and does not boot refer to
Section 2.4.3.
7. If the system powers up and boots refer to Section 2.4.4.
2.4.3 System Does Not Boot
This procedure is to help determine why the DECstation does not
boot. Before starting this procedure be sure you have done the
steps in Section 2.4.1.
1. Remove any third party options and try to reboot the system.
If the system generates any beep codes refer to Section 2.5.1,
Power Up Beep Codes.
2. Try booting from the operating system startup diskette.
a. If the system does not boot verify that all jumpers are set
correctly. Reboot the system after verifying the jumper
settings.
b. Lack of beep codes and video indicate a possible bad main
logic board.
c.If the system still does not boot remove all options and try
to boot the system.
d. Replace the Digital certified options one at a time and see
if the system powers up and boots each time an option is
replaced or a disk drive is reconnected.
3. When the system boots refer to Section 2.4.4.
2.4.4 System Boots
The DECstation can have a problem but still boot on powerup. This procedure is to help determine the problem with a
DECstation that boots but still emits error beep codes or displays
an error message. Before starting this procedure be sure you have
done the steps in Section 2.4.1.
CAUTION
The system must be disconnected from any network before
running the Diagnose diagnostics.
Page 28
Troubleshooting 2–7
1. Determine what the failure is. Refer to Section 2.5 for a list of
possible error messages. If there are no error messages refer
to Section 2.6 for a list of symptoms and possible causes.
2. Run the Diagnose diagnostics.
3. Replace the necessary FRU.
2.5Error Codes and Messages
During the power-up sequence, the DECstation executes built-in
diagnostic and bootstrap routines. During the first portion of
power up testing, the system generates beep codes on the speaker
if the test program detects a fatal error. The system uses the
beep codes to report test results only until screen initialization
and screen retrace verification have occurred. After screen
initialization and verification the built-in diagnostic sends nonfatal error messages to video memory and the system displays the
messages on the monitor.
CAUTION
Do not connect or disconnect the video cable from the
monitor or system when the monitor and/or system is
on. This can cause damage to the system. Always turn
the monitor and system off, then wait 20 seconds and
disconnect the power cord before you remove the system
unit cover. Observe anti-static precautions.
2.5.1 Power Up Beep Codes
During the power up self test, the system generates two levels of
beep codes. The primary level consists of a combination of long
and short beeps which indicate possible system malfunction
conditions. The secondary level utilizes bursts of beeps in
a numeric beep code pattern to indicate specific malfunction
locations on the main logic board.
Table 2–2 lists the primary beep codes. The primary beep codes
indicate a main logic board failure, memory failure, memory
configuration error, or a video error. If a memory failure is
indicated, check and reseat the single-in-line memory modules
(SIMMs) on the 0K Memory Adapter. If you suspect a bad SIMM,
first replace one SIMM and then the other.
Page 29
2–8 Troubleshooting
Table 2–2 Primary Beep Codes
Possible
Beep Code
ProblemCorrective Action
Two short
beeps
Long-shortlong-short
beep
Several
bursts of
1
beeps
Keyboard
failure
Hard disk
failure
Be sure the keyboard cable is firmly
connected.
Be sure the drive cables are firmly
connected and all drive and adapter
jumpers are set correctly.
Diskette drive
failure
Be sure drive cables are firmly
connected and the drive switch is set
correctly.
Tape drive
failure
Be sure the drive cables are firmly
connected and all drive and host
adapter jumpers are set correctly.
Invalid
configuration
Configuration
record bad
Check the information entered with
the Setup utility.
Check the information entered with
the Setup utility. See the hard disk
installation guide for configuration
information. Check the CMOS
battery connection.
Clock chip
lost power
Turn the computer off, wait 20
seconds and then turn it on again.
Check the CMOS battery connection.
Video failureBe sure the VGA jumper setting is
enabled on the main logic board.
BIOS ROM,
CMOS,
DMA, RAM,
interrupt, or
Check cable connections and jumper
and switch settings. If the problem
persists, there might be a problem
on the main logic board.
read/write
errors
1
If the system generates bursts of beeps, refer to Table 2–3 for a list of specific
failure locations corresponding to the particular numeric beep code pattern.
Page 30
Troubleshooting 2–9
When several bursts of beeps are generated, listen carefully and
remember the numeric beep code pattern. This pattern establishes
the secondary level of beep codes. Table 2–3 lists the secondary
beep codes and the test in-progress or test failure that corresponds
to the numeric beep code pattern. For example, "2-1-4" (a burst of
two beeps, a single beep, and a burst of four beeps) indicates that
a failure of bit 3 in the first 64K of RAM has been detected.
Table 2–3 Secondary Beep Codes
Beep CodeDescription of Test or Failure
1-1-3CMOS write/read test in-progress or failure
1-1-4BIOS ROM checksum test in-progress or failure
1-2-1Programmable Interval Timer test in-progress or
1-2-2DMA initialization test in-progress or failure
1-2-3DMA page register write/read test failure
1-3-1RAM refresh verification test in-progress or failure
1-3-31st 64K RAM chip of data line failure - multi-bit
failure
1
1-3-41st 64K RAM odd/even logic failure
1-4-11st 64K RAM address line failure
1-4-21st 64K parity test in-progress or failure
2-1-11st 64K RAM chip or data line failure - bit 0
2-1-21st 64K RAM chip or data line failure - bit 1
2-1-31st 64K RAM chip or data line failure - bit 2
2-1-41st 64K RAM chip or data line failure - bit 4
2-2-11st 64K RAM chip or data line failure - bit 4
2-2-21st 64K RAM chip or data line failure - bit 5
2-2-31st 64K RAM chip or data line failure - bit 6
1
Any of the RAM failures can be caused by a SIMM not being properly seated in
its socket.
Page 31
2–10 Troubleshooting
Table 2–3 (Cont.) Secondary Beep Codes
Beep CodeDescription of Test or Failure
2-2-41st 64K RAM chip or data line failure - bit 7
2-3-11st 64K RAM chip or data line failure - bit 8
2-3-21st 64K RAM chip or data line failure - bit 9
2-3-31st 64K RAM chip or data line failure - bit A
2-3-41st 64K RAM chip or data line failure - bit B
2-4-11st 64K RAM chip or data line failure - bit C
2-4-21st 64K RAM chip or data line failure - bit D
2-4-31st 64K RAM chip or data line failure - bit E
2-4-41st 64K RAM chip or data line failure - bit F
3-1-1Slave DMA register test in-progress or failure
3-1-2Master DMA register test in-progress or failure
3-1-3Master interrupt mask register test in-progress or
failure
3-1-4Slave interrupt mask register test in-progress or failure
3-2-4Keyboard controller test in-progress or failure
3-3-4Screen memory test in-progress or failure
2
3-4-1Screen initialization test in-progress or failure
3-4-2Screen retraces tests in-progress or failure
2
Test failures from this point on can usually be attributed to the VGA adapter or
the slot connector. Try moving the adapter to a different slot.
Page 32
Troubleshooting 2–11
2.5.2 Test Messages
After screen initialization and verification, the built-in diagnostics
send non-fatal error messages to video memory and the system
displays the messages on the monitor. Table 2–4 lists the BIOS
error numbers and the corresponding error messages that displays
on the screen.
Table 2–4 BIOS Error Messages
Error
NumberError Message
01Gate A20 failure
02Unexpected interrupt in protected mode
03Unexpected SW interrupt at xxxx:xxxx
04Memory tests terminated by keystroke
05Memory yyyyy failure at xxxx read xxxx expecting xxxx
06Display adapter failed; using alternate
07No timer tick interrupt
08Shutdown failure
09Timer chip counter 2 failed
10Keyboard xxxxx failure
11Diskette subsystem reset failed
12Diskette drive 0 seek failure
13Diskette drive 1 seek failure
14Hard disk configuration error
15Hard disk controller failure
16Hard disk failure
17Time-of-day clock stopped
18Invalid configuration information - please run SETUP
Type (S)hut off NMI, (R)eboot, other keys to continue
program
Page 33
2–12 Troubleshooting
Table 2–4 (Cont.) BIOS Error Messages
Error
NumberError Message
19Time-of-day not set - please run SETUP program
20Keyboard is locked - please unlock
21Optional ROM bad checksum = xx
22Strike the F1 key to continue
23Diskette read failure 24Not a boot diskette 25No boot device available 26Hard disk read failure 27No boot sector on hard disk 28Insert system diskette and Strike the F1 key to retry
29I/O card parity interrupt at xxxx:xxxx Type (S)hut off
30Memory parity interrupt at xxxx:xxxx Type (S)hut off
31Unexpected type 02 interrupt at xxxx Type (S)hut off
32Enter Password:
33Password is incorrect
34Password OK
35Password has been removed
36New password has been installed
37System halted! Must power down.
boot
NMI, (R)eboot, other keys to continue
NMI, (R)eboot, other keys to continue
NMI, (R)eboot, other keys to continue
Page 34
Troubleshooting 2–13
2.6Troubleshooting by Symptom
This section describes causes and corrective actions for minor
system problems that you can fix. The troubleshooting procedures
are separated into system unit, hard disk and diskette drives,
monitor, and pointing device problems.
2.6.1 System Unit Problems
Table 2–5 lists some common problems with the system unit,
possible causes, and suggested corrective actions. If the corrective
action does not work and it is possible to run the Diagnose
diagnostics, use them to further isolate the problem and then
replace the failing FRU.
Table 2–5 System Unit Troubleshooting Procedures
ProblemPossible CauseCorrective Action
No response when
the system is turned
on.
Power is on, but
there is no monitor
display.
System is not
plugged in.
No power at wall
outlet.
Voltage select switch
incorrectly set.
Brightness and
contrast controls are
not set properly.
Monitor is off.Turn on the monitor.
Monitor cable
incorrectly installed.
Turn the system off.
Plug in the system,
then turn the system
on again.
Use a working wall
outlet.
Make sure the 115/230
Vac voltage select
switch is set correctly.
Adjust brightness and
contrast controls.
Make sure the
monitor cable is
installed properly.
Page 35
2–14 Troubleshooting
Table 2–5 (Cont.) System Unit Troubleshooting Procedures
ProblemPossible CauseCorrective Action
An Ethernet network
adapter is installed
but the node does
not boot when you
try to reboot after
using the utilities
diskette.
System does not boot
from the hard disk.
Tape does not work
in the tape drive.
Main logic board
failure.
Using a diskette
generated reset is
not compatible with
the Ethernet board.
There is no software
on the partition.
System software is
not on the hard disk.
Requested partition
does not exist or is
not formatted.
Primary and
secondary drives
are set incorrectly.
Hard disk is not
installed properly.
Tape is not fully
inserted into the
tape drive.
Tape is worn or
damaged.
Make sure the VGA
jumper is enabled on
the main logic board.
If so, replace the main
logic board.
Ctrl Alt Del
Press
the same time (a soft
reset) to properly reset
the hardware, then
turn system power off
and then on.
Install software on the
partition.
Load the system
software on the hard
disk.
Check the partition.
Format the partition;
re-partition if
necessary.
Make sure the drive
jumpers are correctly
set.
Check hard disk
installation.
Make sure the tape
is fully inserted and
the cartridge release
handle is locked down.
Try another tape.
at
Page 36
Troubleshooting 2–15
Table 2–5 (Cont.) System Unit Troubleshooting Procedures
ProblemPossible CauseCorrective Action
System does not boot
from the diskette
drive.
System does not
reboot when the
power is turned off
and on.
Diskette is not in the
diskette drive.
Drive switch is set
incorrectly.
Diskette is not
bootable.
Diskette is worn or
damaged.
Hardware conflict
(remote boot).
Power was not off
long enough.
Insert a diskette
containing bootable
system software.
Make sure the drive
switch is set correctly.
Use a diskette
containing bootable
system software.
Try another diskette.
Make sure system
is not set for remote
boot.
Turn the power off for
at least 20 seconds
before rebooting.
Page 37
2–16 Troubleshooting
2.6.2 Disk Related Problems
Table 2–6 lists some common disk related problems, possible
causes, and suggested corrective actions. If the corrective action
does not work, run the Diagnose diagnostics to further isolate the
problem and then replace the failing FRU.
Table 2–6 Hard Disk and Diskette Drive Troubleshooting
Procedures
ProblemPossible CauseCorrective Action
Hard disk cannot read
or write information.
Intermittent hard disk
read/write problems.
Hard disk works
but produces extra
characters or garbled
text.
System won’t start from
the diskette drive or
displays the message
Abort, Retry, Ignore.
Diskette drive
cannot read or write
information.
Problem exists with
the drive or drive
adapter.
Possible corrupted
files.
Hard disk is affected
by static electricity.
The diskette has
been demagnetized.
Improperly
formatted diskette.
The diskette drive is
empty.
Diskette is not
formatted.
Make sure all
jumpers are set
correctly.
Restore disk from
back-up files.
Move system away
from any motors,
magnetic devices,
or photocopiers.
Increase the
humidity in the
room and use antistatic mats around
the system.
Make sure the
disk drive cable is
correctly installed.
Replace the
diskette.
Reformat the
diskette.
Insert a diskette
into the diskette
drive.
Use a preformatted
diskette.
Page 38
Troubleshooting 2–17
Table 2–6 (Cont.) Hard Disk and Diskette Drive Troubleshooting
Procedures
ProblemPossible CauseCorrective Action
Diskette is worn or
damaged.
Try another
diskette.
2.6.3 Monitor Problems
Table 2–7 lists some common monitor problems, possible causes,
and suggested corrective actions. If the corrective action does not
work and it is possible to run the Diagnose diagnostics, use them
to further isolate the problem and then replace the failing FRU.
Table 2–7 Monitor Troubleshooting Procedures
ProblemPossible CauseCorrective Action
Monitor green LED
is not on.
There is no light at
the F1 key when you
start the system.
Screen is blank and
monitor LED is on.
Monitor is not
turned on.
Power cord is not
connected.
No power at wall
outlet.
Setup utility was not
run.
Contrast and
brightness controls
set to minimum.
Turn on the monitor
and then the system.
Make sure the power
cord is connected to
the wall outlet.
Use another outlet.
Run the Setup utility.
Use your monitor
and adapter board
manuals and utilities
diskette(s).
Screen goes blank
after successful
power up; monitor
LED is off.
Monitor LED is off,
but display is OK.
Monitor is on, but
no cursor or text
displays.
Main logic board
failure.
Power or monitor
failure.
Faulty LED.Replace the monitor.
System is not on.Turn on the system.
Contrast control is
set to minimum.
Main logic board
failure.
Replace the monitor.
If that doesn’t fix the
problem make sure
the VGA jumper is
enabled on the main
logic board. If it is
enabled, replace the
main logic board.
Turn the monitor and
system off. Disconnect
the monitor from the
system and wall. Plug
the monitor into an
working wall outlet. If
the monitor LED does
not turn on, there is
a problem with the
monitor or monitor
LED.
Turn up the contrast
control.
Replace the monitor.
If that doesn’t fix the
problem make sure
the VGA jumper is
enabled on the main
logic board. If it is
enabled, replace the
main logic board.
Screen display
distorted, rolling,
flickering, or wrong
or uneven color.
Screen displays
distorted images or
goes blank when you
run the software.
Screen displays
partially highlighted
characters.
You have a color
monitor and
the display is
monochrome.
Monitor cable
connector pins bent
or broken.
Electromagnetic
interference exists.
Software is not
configured for, or is
incompatible with,
the current settings
of the VGA board.
Main logic board
VGA board jumpers
incorrectly set.
System was turned
on before turning on
the monitor.
Straighten pins or
replace the monitor.
Move any
electromechanical
device away from the
monitor or move the
monitor.
Reconfigure the
software for VGA
or set the VGA
jumper on the main
logic board to a
standard supported
by your software.
See Section 3.3.1
and Section 3.3.2 of
this manual or the
software manual.
Make sure the VGA
jumper is enabled on
the main logic board.
If so, replace the main
logic board. If that
doesn’t fix the problem
replace the monitor.
Turn off the monitor
and system. Wait at
least 20 seconds. Turn
on the monitor, then
the system unit.
Page 41
2–20 Troubleshooting
2.7Troubleshooting Problems Occurring
During System Operation
Sometimes problems occur during system operation. Use the
following list to help isolate a problem to a specific subsystem by
determining how or when the problem occurs.
The problem occurs during diskette drive access.
•Check the diskette drive and the jumper setting.
•Look for slightly loose cables.
•Check the main logic board jumper settings.
•If possible, run the diagnostics. The problem may be with the
main logic board decoding, resistor pack, or faulty loading on
the data bus.
See also Section 2.6.
The problem occurs during hard disk drive access.
•Check the hard disk drive, including jumper and switch
settings.
•Check for loose drive cables.
•Check the SCSI board. Make sure it is seated properly and its
jumpers are set correctly.
The problem seems to be video related.
•Check the main logic board VGA jumper setting.
The problem seems to be keyboard related.
•Keyboard lock may be partially engaged.
•Check the keyboard connection.
•Run the Diagnose diagnostics. The problem may be the
keyboard interface on the main logic board.
The problem is reproducible or intermittent.
•Expansion options may be competing for interrupt request
lines, I/O address range, or memory address range.
Page 42
Troubleshooting 2–21
The problem seems to be heat related.
•Make sure there is sufficient air flow around the system.
•The system unit may be clogged with dust.
2.8Using the System Utilities Diskette
The menu driven System Utilities diskette (shipped with the
system and required as a Customer Service tool) must be used
when options are added to the system. A language option menu
displays first when the System Utilities diskette is booted. After
a language is selected, an option menu displays. Selecting Setup
from the option menu displays the Setup utility menu. The Setup
utility must be run anytime the following occur:
•The amount of memory in the system is changed.
•Diskette drives are added or removed.
•A different video display board is installed in the system.
•The battery-backed-up date and time are changed.
•The CMOS battery is disconnected or changed.
NOTE
MS-DOS and OS/2 users should use the format command
present in their operating system. Do not use the format
command provided on the System Utilities diskette.
2.8.1 Running the Setup Program
NOTE
If you have installed a new SCSI hard disk drive, format
the drive before you run the Setup utility. See your SCSI
hard disk installation guide.
You need the following information when you run the Setup
utility:
•The type of diskette drive for drive A and optional drive B.
•System base memory size (displayed on the screen at power-
up).
Page 43
2–22 Troubleshooting
•Expansion memory size (displayed on the screen at power-up).
•Primary video adapter type (VGA).
•CPU and BUS clock speeds.
CPU speed is the CPU processing speed, and BUS speed is the
I/O expansion bus transmission speed.
The Setup utility is run as follows:
1. Turn power to the monitor on.
2. Insert the Utilities diskette in the drive and turn power to the
system on.
3. The power-up tests run, then the monitor displays a language
selection menu. Select a language, then press
Enter
.
4. The monitor displays an option menu. Select option 4
(SETUP), then press
Enter
.
5. The monitor displays the Setup utility menu. Follow the
instructions on the bottom of the screen and select the correct
system configuration, then pressF2to save and exit the menu.
NOTE
Use the keyboard arrow keys to select a configuration
in the Setup utility menu; do not use the keypad arrow
keys.
6. Reboot the system using one of the following methods.
•Press the
Ctrl Alt Del
keys simultaneously (preferred
method).
•Press the Reset button on the front of the system unit.
When the system displays the copyright page the setup
procedure is complete.
NOTE
If the hard disk is not formatted, a hard disk failure
message might display on the copyright screen.
Page 44
3
FRUReplacement
3.1Introduction
This chapter contains procedures for removing and replacing each
DECstation field replaceable unit (FRU). To install many of the
FRUs, perform the reverse of the procedure when so noted. Only
qualified service technicians should remove and replace FRUs.
Use only Digital supplied spares.
Table 3–1 lists standard FRUs and their part numbers for the
DECstation systems. Table 3–2 lists optional FRUs and their part
numbers.
Table 3–1 DECstation Standard Field Replaceable Units
Digital Part
FRU
Number
DECstation 212LP main logic board with 1 Mbyte
memory
DECstation 316
memory
DECstation 320SX main logic board with 1 Mbyte
memory (fixed)
100W power supply with fan and IEC assembly29-28113-01
Rear bezel with IEC29-28114-01
Card guide29-28115-01
Speaker with cable assembly29-28138-01
SX main logic board with 0 Kbyte
29-28137-01
29-28112-01
29-28679-01
3–1
Page 45
3–2 FRU Replacement
Table 3–1 (Cont.) DECstation Standard Field Replaceable Units
Digital Part
FRU
Actuator with LED assembly29-28116-01
Reset button assembly29-28117-01
DECstation 212
DECstation 316
LP battery and real time clock29-28242-01
SX/320SX battery29-27439-01
DECstation VGA Graphics Utilities and User Guides
(set of two diskettes)
DECstation VGA 1024 Graphics Utilities and User
Guides (set of two diskettes)
Number
n/a
n/a
Table 3–2 DECstation Optional Field Replaceable Units
Digital Part
FRU
14" VGM100 Monochrome monitor (US)30-30902-01
14" VGM300 Color monitor (US)30-30901-01
14" Color monitor 120V North Hemisphere30-32313-01
Number
Page 46
FRU Replacement 3–3
Table 3–2 (Cont.) DECstation Optional Field Replaceable Units
Digital Part
FRU
14" Color monitor 120V South Hemisphere30-32314-01
14" Color monitor 240V North Hemisphere30-32315-01
14" Color monitor 240V South Hemisphere30-32316-01
14" Color monitor 120V North Hemisphere30-32317-01
14" Color monitor 120V South Hemisphere30-32318-01
14" Color monitor 240V North Hemisphere30-32319-01
14" Color monitor 240V South Hemisphere30-32320-01
512 Kbyte 80 ns SIMM Memory Kit (320
512 Kbyte 100 ns SIMM Memory Kit (212lp/316
2 Mbyte 80 ns SIMM Memory Kit (320
2 Mbyte 100 ns SIMM Memory Kit (212lp/316
SX)19-32974-02
SX)19-32974-01
SX)19-32975-02
SX)19-32975-01
1.2 Mbyte diskette drive, 5.25"30-31071-01
360 Kbyte diskette drive, 5.25"30-33156-01
16-bit SCSI adapter board (AHA-1540/A)20-30945-01
16-bit SCSI adapter board (AHA-1540/B)20-33154-01
SCSI drive ribbon cable assembly29-27441-01
SCSI hard disk drive, 40 Mbyte, 3.5"30-30903-01
SCSI hard disk drive, 80 Mbyte, 3.25"30-30904-01
SCSI hard disk drive, 170 Mbyte, 5.25"30-30905-01
SCSI hard disk drive, 320 Mbyte, 5.25"30-33157-01
Tape drive, 60 Mbyte, (QIC-40)30-34181-01
Mini-Tape cartridge, 1/4" (QIC-40)30-?????-01
IDE hard disk drive, 20 Mbyte, 3.5"30-32375-01
IDE hard disk drive, 40 Mbyte, 3.5"30-32345-01
Number
Page 47
3–4 FRU Replacement
Table 3–2 (Cont.) DECstation Optional Field Replaceable Units
Digital Part
FRU
IDE hard disk drive, 105 Mbyte, 3.5"30-34429-01
IDE hard disk drive, 120 Mbyte, 3.5"30-32344-01
IDE dual drive ribbon cable assembly29-27912-01
2400 BPS integral modem30-31072-01
1200 BPS integral modem30-31073-01
10 MHz Intel 80287 math coprocessor19-30951-01
16 MHz Intel 80387
20 MHz Intel 80387
SX math coprocessor19-30973-01
SX math coprocessor19-?????-01
The following criteria apply when removing or installing
DECstation FRUs.
CAUTION
After you turn power to the system off, do not disconnect
the power cord from the system unit or wall outlet for at
least 20 seconds.
•Always turn power to the system and monitor off and
disconnect all external cables before removing any FRU.
NOTE
Before disconnecting the DECstation from a network,
inform the system administrator that you are going
to disconnect the ThinWire T-connector from the
computer. Do not disconnect any cable or terminator
from the T-connector. Doing so disrupts network
operation.
CAUTION
Always use a grounded wrist strap and grounded work
surface to earth ground when opening the system
unit or handling any external component and its
replacement. Static electricity can damage printed
circuit boards and mass storage devices.
•After replacing a FRU, verify that it and the system function
properly.
3.2Replacing FRUs
This section describes how to remove and replace the various
FRUs in the DECstation. Figure 3–1 shows an exploded view of
the DECstation chassis. Figure 3–2 shows an exploded view of the
DECstation main logic board and options.
Page 49
3–6 FRU Replacement
New Illustration LJ-1711
Figure 3–1Exploded View of DECstation Chassis
Page 50
New Illustration LJ-1710
FRU Replacement 3–7
Figure 3–2Exploded View of DECstation Main Logic Board
and Options
Page 51
3–8 FRU Replacement
3.2.1 Keyboard Replacement
Replace the keyboard as follows:
1. Turn power to the system unit and monitor off.
2. Disconnect the keyboard cable from the system unit.
3. Connect the cable from the new keyboard to the system unit.
4. Turn the power on again.
3.2.2 Monitor Replacement
Replace the monitor as follows:
1. Turn power to the system unit and monitor off.
2. Unplug the power cord to the system unit from the auxilliary
outlet of the DECstation.
3. Disconnect the monitor cable from the system unit.
4. Connect the cable from the new monitor to the system unit.
5. Plug the power cord from the system unit into the auxilliary
outlet of the DECstation.
6. Turn the power on again.
3.2.3 Mouse Replacement
Replace the mouse as follows:
1. Turn power to the system unit and monitor off.
CAUTION
All power must be off when connecting or disconnecting
the mouse or damage to the mouse and/ or main logic
board will result.
2. Disconnect the mouse cable from the system unit.
3. Connect the cable from the new mouse to the system unit.
4. Turn the power on again.
Page 52
FRU Replacement 3–9
3.2.4 System Cover Removal
Remove the system cover as follows:
1. Turn power to the system unit and monitor off.
CAUTION
To avoid damage to the hard disk, do not move or
perform the following procedure for at least 20 seconds
after you turn power to the system off.
2. Disconnect all cables from the back of the system unit.
3. Remove the two countersunk screws that secure the cover to
the chassis of the system unit (Figure 3–3).
4. Slide the cover forward about three inches to clear the locating
pins on the inside of the front bezel and remove the cover
(Figure 3–3).
New Illustration LJ-1709
Figure 3–3Removing the DECstation System Cover
Page 53
3–10 FRU Replacement
3.2.5 Opening the System Unit
Open the system unit as follows (Figure 3–4):
1. Using the key, unlock the system box.
2. Remove the two shake-proof fittings that secure the system
unit option cover and carriage (metal fold-outs).
3. Lift the option cover (left side) counter-clockwise and remove.
4. Lift the carriage (right side) clockwise.
Page 54
New Illustration LJ-1708
FRU Replacement 3–11
Figure 3–4Opening the DECstation System Unit
Page 55
3–12 FRU Replacement
3.2.6 Option Board Replacement
The procedure for replacing an option board in the DECstation is
similar for the different options in the system.
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Note the position of all cables (if any) connected to the option
board and disconnect them.
NOTE
When removing an option board note it’s location and
the location and routing of all cables (if any) attached
to the option board.
3. Remove the mounting screw that secures the option board to
the chassis.
4. Remove the board by sliding it to the left and out of the
expansion slot connector.
5. Configure the jumpers and switches on the new board to
match those on the old board.
6. Install the new board in the slot from which the old board
was removed. Make sure the board is firmly seated in the
connector(s) on the bus adapter board.
7. Secure the board to the chassis with the mounting screw.
Remove the option slot printed circuit board (PCB) as follows:
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Remove the two screws that secure the chassis support to the
system unit, one in the front of the system unit and one in the
rear of the chassis support (Figure 3–5).
3. Lift the chassis support and option slot PCB upward and out
of the system unit (Figure 3–5).
4. Remove the two screws securing the option slot PCB to the
chassis support (Figure 3–5).
5. Secure the new option slot PCB to the chassis support
(Figure 3–5).
6. Re-install the chassis support and option slot PCB by
reversing these steps.
CAUTION
There is a mylar insulator in back of the option slot
PCB. Make sure it is installed and in position when
replacing the option slot PCB.
NOTE
When replacing the chassis support make sure the
slotted tab at the rear connects to the rear panel.
Page 57
3–14 FRU Replacement
New Illustration LJ-1707
Figure 3–5Removing the Bus Adapter Board
Page 58
FRU Replacement 3–15
3.2.8 Speaker Replacement
Replace the speaker as follows:
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Disconnect the speaker cable from the main logic board
(Figure 3–1).
3. Remove two 5/16-inch nuts and lock washers securing the
speaker to the bottom of the chassis (Figure 3–1).
4. Remove the speaker.
Replace the speaker and connect the cable to the main logic
board.
3.2.9 Battery Replacement
Replace the battery as follows:
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Remove the battery as follows:
•On the DECstation 212LP, remove the battery by lifting it
out of the socket on the main logic board (Figure 3–6).
•On the DECstation 316SX and DECstation 320SX, remove
the cable from J3 on the main logic board (Figure 3–7).
Remove the battery from the system unit by pulling it off
the Velcro mounting strip.
WARNING
Do not dispose of the battery at the customer site. Do
not burn the battery or take it apart.
3. Replace the battery by reversing the steps.
Page 59
3–16 FRU Replacement
New Illustration LJ-1706
Figure 3–6Removing the DECstation 212LP Battery
Page 60
New Illustration LJ-1705
FRU Replacement 3–17
Figure 3–7Removing the DECstation 316SX/ 320SX Battery
3.2.10 Reset Button Removal
Remove the reset button as follows:
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Remove all option boards from the system unit (if any)
(Section 3.2.6).
Page 61
3–18 FRU Replacement
3. Disconnect the reset button cable from the main logic board
(Figure 3–8).
4. Depress the option board card guide clip (Figure 3–8).
5. Slide the card guide to the left and remove it from the system
unit (Figure 3–8).
6. From the back of the card guide, push the reset button (and
cable) forward through the card guide (Figure 3–8).
Replace the reset button by reversing these steps.
New Illustration LJ-1704
Figure 3–8Removing the Reset Button
Page 62
FRU Replacement 3–19
3.2.11 Single-In-Line Memory Module Replacement
Replace the Single-In-Line Memory Modules (SIMMs) as follows:
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Remove any option boards that might obstruct the removal
and installation of SIMMs.
3. Use both hands and spread the retaining clips that hold the
SIMM in place (Figure 3–9 and Figure 3–10).
4. Move the SIMM forward to the vertical position (Figure 3–9
and Figure 3–10).
5. Use your index fingers to pull the SIMM away from the
retaining brackets (Figure 3–9 and Figure 3–10) and remove
the SIMM.
6. Grasp the SIMM at both ends and insert it into the socket
(Figure 3–9 and Figure 3–10) and replace the SIMM. Make
sure the SIMM is fully seated in the connector.
7. Press backward and down on the SIMM to lock it into place.
NOTE
The number of chips on the SIMM modules may vary based
on the vendor.
Page 63
3–20 FRU Replacement
Insert version LJ-1703
Figure 3–9Removing and Replacing the 212LP SIMM
Page 64
Insert version LJ-1784
FRU Replacement 3–21
Figure 3–10Removing and Replacing the 316SX/320SX SIMM
Page 65
3–22 FRU Replacement
3.2.12 Math Coprocessor Replacement
Replace the math coprocessor as follows:
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Locate the math coprocessor on the main logic board
(Figure 3–11 and Figure 3–12).
3. Remove the math coprocessor as follows:
•DECstation 212LP: Use a small, flat-blade screwdriver and
alternately lift each end of the coprocessor. (Figure 3–11).
•DECstation 316SX and DECstation 320SX: Use a special
tool to simultaneously lift each corner of the coprocessor.
(Figure 3–12).
NOTE
While lifting the coprocessor out of the socket be
careful not to damage it or the socket, or bend any
pins.
4. Before installing the new math coprocessor, straighten any
pins (if necessary) so they align with the holes in the socket.
5. Make sure pin 1 of the math coprocessor is aligned with pin 1
of the socket.
NOTE
Facing the front of the DECstation 212LP, the pin 1
location is indicated by a dot near the lower left corner
of the socket (Figure 3–11).
Facing the front of the DECstation 316SX and
DECstation 320SX, the pin 1 location is indicated by
a numeral 1 near the lower right corner of the socket
(Figure 3–12).
6. Install the new math coprocessor in the socket by alternately
pressing each end into the socket. Do this until it is firmly
seated in the socket (Figure 3–11 and Figure 3–12).
Page 66
Insert version LJ-1701
FRU Replacement 3–23
Figure 3–11Replacing the 212LP Math Coprocessor
Page 67
3–24 FRU Replacement
New Illustration LJ-1700
Figure 3–12Replacing the 316SX Math Coprocessor
Page 68
New Illustration LJ-1785
FRU Replacement 3–25
Figure 3–13320SX Math Coprocessor Replacement
Page 69
3–26 FRU Replacement
3.2.13 Main Logic Board Replacement
Replace the main logic board as follows:
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Remove all option boards and their cables, if any,
(Section 3.2.6).
3. Remove the system unit chassis support and bus adapter
board (Section 3.2.7).
4. Remove all the SIMMs installed on the main logic board
(Section 3.2.11).
5. Remove the math coprocessor if one is installed
(Section 3.2.12).
6. Remove the power supply, power on LED, floppy/ hard/ tape
drive interface, and IDE interface cables attached to the main
logic board (Figure 3–14 and Figure 3–15).
NOTE
When removing the cables note their location and
routing.
7. Remove six 3/16-inch hex standoffs that secure the serial,
parallel, and monitor connectors to the system unit
(Figure 3–14 and Figure 3–15).
NOTE
The connectors are soldered to the main logic board.
Each connector (and main logic board) is secured to the
system unit by the six standoffs.
8. Remove the six screws securing the main logic board to the
system unit (Figure 3–14 and Figure 3–15).
9. Remove the main logic board (Figure 3–14 and Figure 3–15).
10. Set all switches and jumpers on the new main logic board to
the same positions as those set on the old main logic board.
11. Install all options (if any) that were removed from the old
main logic board onto the new main logic board.
Page 70
FRU Replacement 3–27
12. Replace the main logic board by reversing the steps used to
remove the board.
NOTE
There is a mylar insulator under the main logic board.
Make sure it is installed and in position when replacing
the main logic board (Figure 3–14 and Figure 3–15).
New Illustration LJ-1699
Figure 3–14Removing the 212LP Main Logic Board
Page 71
3–28 FRU Replacement
New Illustration LJ-1698
Figure 3–15Removing the 316SX Main Logic Board
Page 72
New Illustration LJ-1786
FRU Replacement 3–29
Figure 3–16Removing the 320SX Main Logic Board
Page 73
3–30 FRU Replacement
3.2.14 Floppy Drive Replacement
Replace the floppy drive as follows (Figure 3–17):
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Remove the ribbon cable from the back of the drive.
3. Remove the three mounting screws that hold the drive in
place. One screw is located underneath the left side and two
are on the right side of the floppy.
4. Remove the floppy disk drive.
5. Set the switch on the new drive to match that of the old drive.
6. Install the new drive and re-install the three mounting screws
7. Reconnect the ribbon cable to the floppy drive.
8. After replacing the drive reconnect all system cables.
9. Verify the operation of the new drive.
10. Reinstall the system cover.
3.2.15 Replacing An Optional Floppy Drive
To remove or replace an optional floppy disk drive, refer to the
appropriate option installation guide.
3.2.16 Replacing an Optional Hard Disk or Tape Drive
To remove or replace an optional hard disk or tape drive, refer to
the appropriate option installation guide.
Page 74
New Illustration LJ-1697
FRU Replacement 3–31
Figure 3–17Replacing the Floppy Disk Drive
Page 75
3–32 FRU Replacement
3.2.17 DECstation Power Supply Removal
Remove the DECstation power supply as follows (Figure 3–18):
1. Remove the cover (Section 3.2.4) and open the system unit
(Section 3.2.5).
2. Remove the ribbon cable from the back of the drive.
3. Disconnect the power supply and power on LED cables from
the main logic board.
4. Remove the LED actuator arm from the power supply by
sliding the tie wrap toward the front of the system unit and
lifting the arm up and off the power supply switch.
5. Facing the front of the system unit, remove the three
mounting screws on the right side of the power supply.
6. Tilt the carriage up 90° and remove the two screws on top of
the carriage holding the power supply.
7. Separate the power supply unit from the system unit by
sliding it away from the front of the system unit.
NOTE
Check the power supply fuse before installing a new
power supply. The fuse is rated at 4 AMPS/ 250 Vac and
is approx. 3/4 inch in length.
To replace the power supply unit perform the previous steps in
reverse order.
Page 76
New Illustration LJ-1696
FRU Replacement 3–33
Figure 3–18Removing the DECstation Power Supply
Page 77
3–34 FRU Replacement
3.3Main Logic Board Jumpers
3.3.1 212LP Main Logic Board Jumpers
Figure 3–19 shows the location of the jumpers on the main logic
board. Table 3–3 describes the jumper configurations and provides
a recommended default setting for the jumpers.
New Illustration LJ-1695
Figure 3–19212LP Main Logic Board Jumper Locations
Page 78
FRU Replacement 3–35
Table 3–3 212LP Main Logic Board Jumper Settings
FeatureDescriptionJumper Setting
Video interruptStandard
IRQ9E12 and E13, installed
On-board videoEnabled
DisabledE14 and E15, installed
BIOS ROM type4 Mbyte or 8 Mbyte
ROM
Two 32 Kbyte
EEPROMs
(U17 and U18)
Expansion bus
speed
Same as system
clock speed
One-half system
clock speed
Memory parity
Enabled
check
DisabledE6 and E7, installed
1
E12 and E13, No
connection
1
1
E15 and E16, installed
E10 and E11, installed
E9 and E10, installed
1
E2 and E4, installed
E4 and E8, installed
1
E5 and E6, installed
1
Default Setting
Page 79
3–36 FRU Replacement
3.3.2 316SX Main Logic Board Jumpers
Figure 3–20 shows the location of the jumpers on the main logic
board. Table 3–4 describes the jumper configurations and provides
a recommended default setting for the jumpers.
New Illustration LJ-1694
Figure 3–20316SX Main Logic Board Jumper Locations
Page 80
FRU Replacement 3–37
Table 3–4 316SX Main Logic Board Jumper Settings
FeatureDescriptionJumper Setting
Math
coprocessor
80387SX installed
80387SX not installed
1
BIOS ROM type128 Kbyte (16 KB)E2 and E3, installed
256 Kbyte (32 KB)
512 Kbyte (64 KB)E1 and E2, installed
Printer port
interrupt
Serial port
interrupt
Video modeColor monitor
IRQ5 select
IRQ7 select
IRQ3 select
IRQ4 select
1
1
1
Monochrome monitor
Video port
interrupt
Disable IRQ9
Enabled IRQ9
On-board videoVGA enabled
1
1
VGA disabled
E30 and E31, installed
E31 and E32, not installed
E5 and E6, installed
1
E1 and E2, installed
E5 and E6, installed
E4 and E5, installed
E19 and E20, installed
E20 and E21, installed
E16 and E18, installed
E14 and E16, installed
E7 and E8, installed
E8 and E9, installed
E25 and E26, No
connection
E26 and E27, installed
E33 and E34, installed
E34 and E35, installed
1
Default Setting
Page 81
3–38 FRU Replacement
3.3.3 DECstation 316SX Main Logic Board Switch
Settings
Figure 3–21 shows the location of the switch on the main logic
board. Table 3–5 describes the switch configurations and provides
a recommended default setting for each switch.
New Illustration LJ-1693
Figure 3–21DECstation 316SX Main Logic Board Switch
Location
Page 82
FRU Replacement 3–39
Table 3–5 DECstation 316SX Main Logic Board Switch Settings
Switch
FeatureDescription
Parallel Port
Enable (SW1)
Parallel Port
Address(SW2)
Serial Port
Enable (SW3)
Serial Port
Address (SW4)
Parallel Port
Mode (SW5)
Diskette Drive
Address (SW6)
IDE Drive
Enable (SW7)
IDE Drive
Address (SW8)
Enabled
Disabled
LPT1= 378-37F HEX
LPT2= 278-27F HEX
Enabled
Disabled
COMM1= 3F8-3FF HEX
COMM2= 2F8-2FF HEX
Enabled unidirectional
Enabled bi-directional
Primary= 3F0-3F7 HEX
Secondary= 370-377 HEX
Enable IDE connector
Disable IDE connector
Primary= 1F0-1F7 HEX for CS0
1
1
376-377 HEX for CS1
Secondary= 170-177 HEX for CS0
1
1
1
1
1
1
376-377 HEX for CS1
Setting
SW1, on
SW1, off
SW2, on
SW2, off
SW3, on
SW3, off
SW4, on
SW4, off
SW5, on
SW5, off
SW6, on
SW6, off
SW7, on
SW7, off
1
SW8, on
SW8, off
1
Default Setting
Page 83
3–40 FRU Replacement
3.3.4 320SX Main Logic Board Jumpers
Figure 3–22 shows the location of the jumpers on the main logic
board. Table 3–6 describes the jumper configurations and provides
a recommended default setting for the jumpers.
New Illustration LJ-1787
Figure 3–22320SX Main Logic Board Jumper Locations
Page 84
FRU Replacement 3–41
Table 3–6 320SX Main Logic Board Jumper Settings
FeatureDescriptionJumper Setting
BIOS ROM Type256 Kbyte
(32 KBx8)
Reserved for
future use
Parallel port
interrupt
Serial port
interrupt
Video modeColor
Reserved for future
use
IRQ5
1
IRQ7
IRQ3
1
IRQ4
1
Monochrome monitor
Video interruptDisable
1
Enabled IRQ9
On-Board video
enable
1
Default Setting
Enabled
VGA disabled
1
1
E5 and E6, installed
E1 and E2, installed
Reserved for future use
E13 and E14, installed
E14 and E15, installed
E17 and E18, installed
E16 and E17, installed
E8 and E9, installed
E7 and E8, installed
E22, E23, and E24 fixed
E19 and E20, installed
E20 and E21, installed
Page 85
3–42 FRU Replacement
3.3.5 DECstation 320SX Main Logic Board Switch
Settings
Figure 3–23 shows the location of the switch on the main logic
board. Table 3–7 describes the switch configurations and provides
a recommended default setting for each switch.
New Illustration LJ-1788
Figure 3–23DECstation 320SX Main Logic Board Switch
Location
Page 86
FRU Replacement 3–43
Table 3–7 DECstation 320SX Main Logic Board Switch Settings
Switch
FeatureDescription
Parallel portEnabled
1
Disabled
Parallel port
address
LPT1= 378-37F HEX
LPT2= 278-27F HEX
Serial portEnabled
1
1
Disabled
Serial port
address
COMM1= 3F8-3FF HEX
COMM2= 2F8-2FF HEX
Parallel port modeEnabled unidirectional
1
1
Enabled bi-directional
Diskette drive
address
Primary= 3F0-3F7 HEX
Secondary= 370-377 HEX
IDE driveEnable IDE connector
1
1
Disable IDE connector
IDE drive addressPrimary= 1F0-1F7 HEX for CS0
376-377 HEX for CS1
Secondary= 170-177 HEX for CS0
376-377 HEX for CS1
1
Setting
SW1, on
SW1, off
SW2, on
SW2, off
SW3, on
SW3, off
SW4, on
SW4, off
SW5, on
SW5, off
SW6, on
SW6, off
SW7, on
SW7, off
1
SW8, on
SW8, off
1
Default Setting
Page 87
A
PowerConsumption
The following table lists the power consumption for the
DECstation base systems.
NOTE
The reserve current row indicates the amount of current
available for options and may be distributed between the
other slots as needed.
Table A–1 DECstation Base System Power Consumption
Current
+5 Volts
Amps
-12
Volts
Amps
+12
Volts
Amps
+12 Peak
Amps
DC
Power
(VA)
Available
current
Current
required
Reserve
current
Power
consumed
Power
available
12.800.3002.7005.00—
2.700.0240.030——
10.100.2802.6705.00—
13.500.1200.150—13.77
———— 86.23
A–1
Page 88
B
PeripheralInterface
The following tables list the pin assignments and function of each
peripheral interface connector on the rear panel of the DECstation
systems.
Table B–1 Parallel I/O Port Connector
Pin NumberFunction
1Strobe
2Data bit 0
3Data bit 1
4Data bit 2
5Data bit 3
6Data bit 4
7Data bit 5
8Data bit 6
9Data bit 7
10Acknowledge
11Busy
12Paper end
13Select
14Auto feed
15Error
16Initialize
B–1
Page 89
B–2 Peripheral Interface
Table B–1 (Cont.) Parallel I/O Port Connector
Pin NumberFunction
17Select in
18 to 25Ground
Table B–2 RS-232C Serial Port Connector
Pin NumberFunction
1Carrier detect
2Receive data
3Transmit data
4Data terminal ready
5Signal ground
6Data set ready
7Request to send
8Clear to send
9Ring indicator
Table B–3 Keyboard and Mouse Connectors
Pin NumberFunction
1Data
2Reserved
3Ground
4+5 Vdc
5Clock
6Reserved
Page 90
Table B–4 Video Port Connector
Pin NumberFunction
1Red video
2Green video
3Blue video
4Monitor ID bit 2 (not used)
5Ground
6Red return (ground)
7Green return (ground)
8Blue return (ground)
9Key (no pin)
10Sync return (ground)
11Monitor ID bit 0 (not used)
12Monitor ID bit 1 (not used)
13Horizontal sync
14Vertical Sync
15Not used
Peripheral Interface B–3
NOTE
The monitor type (color or monochrome) is determined
when power to the system is turned on.
NOTE
Monochrome monitors use the green video for all video
input and ignore the red and blue video.
NOTE
A monochrome monitor does not use the monitor ID bits.
Page 91
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