Digital Equipment 7300 User manual

DIGITALServer7300/7300RSeries
ServiceManual
Part Number: EK-K9FWW-SG. A01
This manual is for anyone who services a DIGITAL Server 7300/7300R Series system.
It covers installation, power-up, initial troubleshooting, and component installation.
January 1998
Digital Equipment Corporation
Maynard, Massachusetts

January 1998
Digital Equipment Corporation makes no representations that the use of its products in the manner
described in this publication will not infringe on existing or future patent rights, nor do the
descriptions contained in this publication imply the granting of licenses to make, use, or sell
equipment or software in accordance with the description.
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, if any, 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 or equipment that is not supplied by Digital Equipment Corporation or its
affiliated companies.
© Digital Equipment Corporation 1998. All rights reserved.
The following are trademarks of Digital Equipment Corporation: DEClaser, Digital, OpenVMS,
PATHWORKS, and the DIGITAL logo. The following are third-party trademarks: Adobe and
PostScript are registered trademarks of Adobe Systems, Incorporated. Helvetica and Times are
registered trademarks of Linotype Co. Microsoft and MS-DOS are registered trademarks and
Windows is a trademark of Microsoft Corporation.
The following are third-party trademarks: Lifestyle 28.8 DATA/FAX Modem is a trademark of
Motorola, Inc. UNIX is a registered trademark in the U.S. and other countries, licensed exclusively
through X/Open Company Ltd. U.S. Robotics and Sportster are registered trademarks of U.S.
Robotics. Windows NT is a trademark of Microsoft, Inc. All other trademarks and registered
trademarks are the property of their respective holders.
FCC Notice: The equipment described in this manual generates, uses, and may emit radio
frequency energy. The equipment has been type tested and found to comply with the limits for a
Class A digital device pursuant to Part 15 of FCC Rules, which are designed to provide reasonable
protection against such radio frequency interference. Operation of this equipment in a residential
area may cause interference, in which case the user at his own expense will be required to take
whatever measures are required to correct the interference.
Shielded Cables: If shielded cables have been supplied or specified, they must be used on the
system in order to maintain international regulatory compliance.
Warning! This is a Class A product. In a domestic environment this product may cause radio
interference, in which case the user may be required to take adequate measures.
Achtung! Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei
Betrieb dieses Gerätes Rundfunkstörungen auftreten, in welchen Fällen der Benutzer für
entsprechende Gegenmaßnahmen verantwortlich ist.
Avertissement! Cet appareil est un appareil de Classe A. Dans un environnement résidentiel, cet
appareil peut provoquer des brouillages radioélectriques. Dans ce cas, il peut être demandé à
l'utilisateur de prendre les mesures appropriées.

DIGITAL Server 7300/7300R Series Service Manual iii
Table of Contents
1 System Overview
DIGITAL Server 7300/7300R System Drawer (BA30A) ......................................................1–3
Cover Interlocks ............................................................................................................1–4
Cabinet System.....................................................................................................................1–6
Cabinet Differences.......................................................................................................1–7
Cabinet System Fan Tray...............................................................................................1–7
Pedestal System....................................................................................................................1–8
Control Panel and Drives.................................................................................................... 1–10
System Consoles.................................................................................................................1–12
SRM Console............................................................................................................... 1–12
AlphaBIOS Console.....................................................................................................1–12
Environment Variables................................................................................................1–13
System Architecture ........................................................................................................... 1–14
System Motherboard........................................................................................................... 1–16
CPU Types.........................................................................................................................1–18
CPU Variants............................................................................................................... 1–18
CPU Module Layout.................................................................................................... 1–18
Alpha Chip Composition ............................................................................................. 1–19
Chip Description.......................................................................................................... 1–19
CPU Configuration Rules ............................................................................................ 1–19
CPU Module Color Codes............................................................................................ 1–19
Memory Modules ............................................................................................................... 1–20
Memory Variants......................................................................................................... 1–21
Memory Operation.......................................................................................................1–21
Memory Configuration Rules....................................................................................... 1–21
Memory Addressing ...........................................................................................................1–23
System Bus......................................................................................................................... 1–25
System Bus to PCI Bus Bridge Module............................................................................... 1–27
PCI I/O Subsystem .............................................................................................................1–29

iv DIGITAL Server 7300/7300R Series Service Manual
Server Control Module....................................................................................................... 1–31
Power Control Module ....................................................................................................... 1–33
Power Supply..................................................................................................................... 1–35
2 Power-Up
Control Panel ....................................................................................................................... 2–2
Power-Up Sequence....................................................................................................... 2–4
SROM Power-Up Test Flow................................................................................................. 2–8
SROM Errors Reported ...................................................................................................... 2–11
XSROM Power-Up Test Flow............................................................................................ 2–12
XSROM Errors Reported.................................................................................................... 2–15
Console Power-Up Tests .................................................................................................... 2–17
Console Device Determination........................................................................................... 2–19
Console Device Options .............................................................................................. 2–20
Console Power-Up Display................................................................................................. 2–21
Fail-Safe Loader................................................................................................................. 2–25
3 Troubleshooting
Troubleshooting with LEDs...................................................................................................3-2
Processor (CPU) LEDs ..................................................................................................3-3
System Bus to PCI Bus Bridge Module LEDs (B3040-AA)............................................3-3
Cabinet Power and Fan LEDs.........................................................................................3-4
Troubleshooting Power Problems..........................................................................................3-5
If Halt Is Caused by Power, Fan, or Over-Temperature Problems...................................3-5
If Power Problem Occurs at Power-Up ...........................................................................3-6
Recommended Order for Troubleshooting Failure at Power-Up......................................3-6
Power Control Module LEDs..........................................................................................3-7
Troubleshooting with the Maintenance Bus (I2C Bus)............................................................3-9
Monitoring System Conditions .....................................................................................3-10
Displaying Faults..........................................................................................................3-10
Writing Error States......................................................................................................3-10
Tracking Configurations............................................................................................... 3-10
Running Diagnostics — Test Command.............................................................................. 3-11
Testing an Entire System.....................................................................................................3-12
Testing Memory...........................................................................................................3-15
Testing PCI Buses and Devices ....................................................................................3-18
4 Power System
Power Supply....................................................................................................................... 4–2
Power Control Module Features ........................................................................................... 4–4
Power Circuit and Cover Interlocks...................................................................................... 4–6

DIGITAL Server 7300/7300R Series Service Manual v
Power-Up/Down Sequence...................................................................................................4–8
Cabinet Power Configuration Rules.................................................................................... 4–10
Pedestal Power Configuration Rules (North America and Japan)........................................ 4–12
Pedestal Power Configuration Rules (Europe and Asia Pacific).......................................... 4–14
5 Error Detection with Error Registers
Overview of Error Detection.................................................................................................5–2
Error Registers......................................................................................................................5–5
External Interface Status Register – EI_STAT...............................................................5–6
External Interface Address Register - EI_ADDR ......................................................... 5–10
MC Error Information Register 0 (MC_ERR0 - Offset = 800)...................................... 5–12
MC Error Information Register 0 (MC_ERR0 - Offset = 800)...................................... 5–13
MC Error Information Register 1 (MC_ERR1 - Offset = 840)..................................... 5–14
CAP Error Register (CAP_ERR - Offset = 880).......................................................... 5–16
PCI Error Status Register 1 (PCI_ERR1 - Offset = 1040)............................................. 5–19
Troubleshooting IOD-Detected Errors................................................................................ 5–20
System Bus ECC Error ................................................................................................ 5–21
System Bus Nonexistent Address Error........................................................................5–22
System Bus Address Parity Error................................................................................. 5–23
PIO Buffer Overflow Error (PIO_OVFL)..................................................................... 5–24
Page Table Entry Invalid Error .................................................................................... 5–25
PCI Master Abort.........................................................................................................5–25
PCI System Error.........................................................................................................5–25
PCI Parity Error........................................................................................................... 5–25
Broken Memory........................................................................................................... 5–26
Command Codes.......................................................................................................... 5–28
Node IDs 5–29
Double Error Halts and Machine Checks While in PAL Mode............................................ 5–31
PALcode Overview......................................................................................................5–31
Double Error Halt........................................................................................................5–32
Machine Checks While in PAL.................................................................................... 5–32
6 Removal and Replacement
System Safety.......................................................................................................................6–2
FRU List...............................................................................................................................6–3
Power System FRUs.............................................................................................................6–9
System Drawer Exposure (Cabinet)....................................................................................6–11
System Drawer Exposure (Pedestal) ................................................................................... 6–13
CPU Removal and Replacement........................................................................................ 6–15
CPU Fan Removal and Replacement.................................................................................. 6–17
Memory Removal and Replacement................................................................................... 6–19
Power Control Module Removal and Replacement............................................................. 6–21

vi DIGITAL Server 7300/7300R Series Service Manual
System Bus to PCI Bus Bridge (B3040-AA) Module Removal and Replacement ............... 6–23
System Motherboard Removal and Replacement................................................................ 6–25
PCI/EISA Motherboard (B3050/B3052) Removal and Replacement.................................. 6–27
Server Control Module Removal and Replacement ............................................................ 6–29
PCI/EISA Option Removal and Replacement..................................................................... 6–31
Power Supply Removal and Replacement........................................................................... 6–33
Power Harness Removal and Replacement......................................................................... 6–35
System Drawer Fan Removal and Replacement.................................................................. 6–37
Cover Interlock Removal and Replacement........................................................................ 6–39
Operator Control Panel Removal and Replacement (Cabinet)............................................. 6–41
Operator Control Panel Removal and Replacement (Pedestal)............................................ 6–43
Floppy Removal and Replacement ..................................................................................... 6–45
CD-ROM Removal and Replacement................................................................................. 6–47
Cabinet Fan Tray Removal and Replacement..................................................................... 6–49
Cabinet Fan Tray Power Supply Removal and Replacement............................................... 6–51
Cabinet Fan Tray Fan Removal and Replacement .............................................................. 6–53
Cabinet Fan Tray Fan Fail Detect Module Removal and Replacement ............................... 6–55
StorageWorks Shelf Removal and Replacement................................................................. 6–57
7 Running Utilities
Selecting Utilities from the AlphaBIOS Menu...................................................................... 7–2
Running Utilities from a Serial Terminal.............................................................................. 7–3
Running the EISA Configuration Utility............................................................................... 7–4
Running RAID Standalone Configuration Utility.................................................................. 7–5
Updating Firmware............................................................................................................... 7–6
Updating Firmware from the Internal CD-ROM ............................................................ 7–8
Updating Firmware from the Internal Floppy Disk......................................................... 7–9
Updating Firmware from a Network Device................................................................ 7–12
LFU Commands................................................................................................................. 7–13
8 SRM Console Commands and Environment Variables
Summary of SRM Console Commands................................................................................. 8–2
Summary of SRM Environment Variables............................................................................ 8–4
Recording Environment Variables........................................................................................ 8–6
9 Operating the System Remotely
RCM Console Overview....................................................................................................... 9–2
Modem Usage ............................................................................................................... 9–3
Entering and Leaving Command Mode.......................................................................... 9–6
RCM Commands........................................................................................................... 9–7
Dial-Out Alerts............................................................................................................ 9–15

DIGITAL Server 7300/7300R Series Service Manual vii
Resetting the RCM to Factory Defaults........................................................................ 9–18
Troubleshooting Guide ................................................................................................ 9–19
Modem Dialog Details.................................................................................................9–22
Figures
Figure 1-1 Components of the BA30A System Drawer............................... 1–3
Figure 1-2 Cover Interlock Circuit............................................................... 1–5
Figure 1-3 DIGITAL Server 7300/7300R Cabinet System ........................... 1–6
Figure 1-4 Cabinet Fan Tray........................................................................ 1–7
Figure 1-5 Pedestal System Front................................................................. 1–8
Figure 1-6 Pedestal System Rear.................................................................. 1–9
Figure 1-7 Control Panel Assembly ........................................................... 1–10
Figure 1-8 AlphaBIOS Boot Menu............................................................. 1–13
Figure 1-9 Architecture Diagram ............................................................... 1–14
Figure 1-10 System Motherboard Module Locations.................................. 1–16
Figure 1-11 CPU Module Layout............................................................... 1–18
Figure 1-12 Memory Module Layout......................................................... 1–20
Figure 1-13 How Memory Addressing Is Calculated.................................. 1–23
Figure 1-14 System Bus Block Diagram .................................................... 1–25
Figure 1-15 Bridge Module........................................................................ 1–27
Figure 1-16 PCI Block Diagram................................................................. 1–29
Figure 1-17 Server Control Module ........................................................... 1–31
Figure 1-18 Power Control Module............................................................ 1–33
Figure 1-19 Location of Power Supply....................................................... 1–35
Figure 2-1 Control Panel and LCD Display.................................................. 2–2
Figure 2-2 Power-Up Flow........................................................................... 2–4
Figure 2-3 Contents of FEPROMs................................................................ 2–5
Figure 2-4 Console Code Critical Path......................................................... 2–6
Figure 2-5 SROM Power-Up Test Flow....................................................... 2–8
Figure 2-6 XSROM Power-Up Flowchart .................................................. 2–12
Figure 2-7 Console Device Determination Flowchart................................. 2–19
Figure 3-1 CPU and Bridge Module LEDs....................................................3-2
Figure 3-2 Cabinet Power and Fan LEDs......................................................3-4
Figure 3-3 PCM LEDs..................................................................................3-7
Figure 3-4 I2C Bus Block Diagram................................................................3-9
Figure 4-1 Power Supply Outputs ................................................................ 4–2
Figure 4-2 Power Control Module................................................................ 4–4
Figure 4-3 Power Circuit Diagram............................................................... 4–6
Figure 4-4 Power Up/Down Sequence Flowchart......................................... 4–8
Figure 4-5 -EN & -EP Single Drawer Cabinet Power Configuration .......... 4–10
Figure 4-6 -EN Three Drawer Cabinet Power Configuration...................... 4–11

viii DIGITAL Server 7300/7300R Series Service Manual
Figure 4-7 Pedestal Power Distribution (N.A. and Japan) ...........................4–12
Figure 4-8 Pedestal Power Distribution (Europe and AP)............................4–14
Figure 5-1 Error Detector Placement ........................................................... 5–2
Figure 6-1 System Drawer FRU Locations................................................... 6–3
Figure 6-2 Location of Power System FRUs................................................ 6–9
Figure 6-3 Exposing System Drawer (H9A10-EN & -EP Cabinet)..............6–11
Figure 6-4 Exposing System Drawer (Pedestal) ..........................................6–13
Figure 6-5 Removing a CPU Module..........................................................6–15
Figure 6-6 Removing CPU Fan...................................................................6–17
Figure 6-7 Removing a Memory Module....................................................6–19
Figure 6-8 Removing Power Control Module .............................................6–21
Figure 6-9 Removing System Bus to PCI/EISA Bus Bridge Module...........6–23
Figure 6-10 Removing the System Motherboard........................................6–25
Figure 6-11 Replacing PCI/EISA Motherboard...........................................6–27
Figure 6-12 Removing Server Control Module ...........................................6–29
Figure 6-13 Removing PCI/EISA Option....................................................6–31
Figure 6-14 Removing Power Supply .........................................................6–33
Figure 6-15 Removing Power Harness........................................................6–35
Figure 6-16 Removing System Drawer Fan ................................................6–37
Figure 6-17 Removing Cover Interlocks.....................................................6–39
Figure 6-18 Removing OCP (Cabinet)........................................................6–41
Figure 6-19 Removing OCP (Pedestal).......................................................6–43
Figure 6-20 Removing Floppy Drive ..........................................................6–45
Figure 6-21 Removing CD-ROM................................................................6–47
Figure 6-22 Removing Cabinet Fan Tray....................................................6–49
Figure 6-23 Removing Cabinet Fan Tray Power Supply .............................6–51
Figure 6-24 Removing Cabinet Fan Tray Fan.............................................6–53
Figure 6-25 Removing Fan Tray Fan Fail Detect Module...........................6–55
Figure 6-26 Removing StorageWorks Shelf................................................6–57
Figure 7-1 Running a Utility from a Graphics Monitor ............................... 7–2
Figure 7-2 Starting LFU from the AlphaBIOS Console................................ 7–6
Figure 7-3 Formatting a FAT Partition......................................................... 7–9
Figure 7-4 Standard Formatting..................................................................7–10
Figure 9-1 RCM Connections...................................................................... 9–3
Tables
Table 1-1 PCI Motherboard Slot Numbering ..............................................1–29
Table 2-1 Control Panel Display.................................................................. 2–3
Table 2-2 XSROM Tests ............................................................................2–13
Table 2-3 Memory Tests.............................................................................2–14

DIGITAL Server 7300/7300R Series Service Manual ix
Table 2-4 IOD Tests .................................................................................. 2–17
Table 2-5 PCI Motherboard Tests (B3050/B3052)..................................... 2–18
Table 3-1 Power Control Module LED States...............................................3-8
Table 5-1 External Interface Status Register ................................................ 5–8
Table 5-2 Loading and Locking Rules for External Interface Registers......5–11
Table 5-3 MC Error Information Register 0............................................... 5–12
Table 5-4 MC Error Information Register 0.............................................. 5–13
Table 5-5 MC Error Information Register 1............................................... 5–15
Table 5-6 CAP Error Register.................................................................... 5–17
Table 5-7 PCI Error Status Register 1........................................................ 5–19
Table 5-8 CAP Error Register Data Pattern................................................ 5–20
Table 5-9 System Bus ECC Error Data Pattern .......................................... 5–21
Table 5-10 System Bus Nonexistent Address Error Troubleshooting.......... 5–22
Table 5-11 Address Parity Error Troubleshooting...................................... 5–23
Table 5-12 Cause of PIO_OVFL Error....................................................... 5–24
Table 5-13 ECC Syndrome Bits Table....................................................... 5–27
Table 5-14 Decoding Commands............................................................... 5–28
Table 5-15 Node IDs.................................................................................. 5–30
Table 6-1 Field-Replaceable Unit Part Numbers.......................................... 6–4
Table 7-1 AlphaBIOS Option Key Mapping ................................................ 7–3
Table 7-2 File Locations for Creating Update Diskettes on a PC................ 7–10
Table 7-3 LFU Command Summary.......................................................... 7–13
Table 8-1 Summary of SRM Console Commands........................................ 8–2
Table 8-2 Environment Variable Summary.................................................. 8–4
Table 8-3 Environment Variables Worksheet............................................... 8–6
Table 9-1 RCM Command Summary........................................................... 9–7
Table 9-2 RCM Status Command Fields.................................................... 9–14
Table 9-3 RCM Troubleshooting ............................................................... 9–19
Table 9-4 RCM/Modem Interchange Summary.......................................... 9–24

x DIGITAL Server 7300/7300R Series Service Manual

DIGITAL Server 7300/7300R Series Service Manual xi
Preface
Document Audience
This manual is written for the customer service engineer.
Document Structure
This manual uses a structured documentation design. Topics are organized into small
sections for efficient online and printed reference. Each topic begins with an abstract,
followed by an illustration or example, and ends with descriptive text.
This manual has nine chapters, as follows:
• Chapter 1, System Overview, introduces the DIGITAL Server 7300/7300R series
pedestal and cabinet systems and gives an overview of the system bus modules.
• Chapter 2, Power-Up, provides information on how to interpret the power-up display
on the operator control panel, the console screen, and system LEDs. It also describes
how hardware diagnostics execute when the system is initialized.
• Chapter 3, Troubleshooting, describes troubleshooting during power-up and booting,
as well as the test command.
• Chapter 4, Power System, describes the DIGITAL Server 7300/7300R power system
• Chapter 5, Error Detection with Error Registers, describes the error registers used
to hold error information.
• Chapter 6, Removal and Replacement, describes removal and replacement
procedures for field-replaceable units (FRUs).
• Chapter 7, Running Utilities, explains how to run utilities such as the EISA
Configuration Utility and RAID Standalone Configuration Utility.

xii DIGITAL Server 7300/7300R Series Service Manual
• Chapter 8, SRM Console Commands and Environment Variables, summarizes the
commands used to examine and alter the system configuration.
• Chapter 9, Operating the System Remotely, describes how to use the remote
console monitor (RCM) to monitor and control the system remotely.
Documentation Titles
The following table lists titles related to DIGITAL Server 7300/7300R series systems.
DIGITAL Server 7300/7300R Series Documentation
Title Order Number
DIGITAL 7300/7300R Series User and Configuration
Documentation Kit QC-06DAC-H8
System Drawer User's Guide ER-K9FWW-UA
Configuration and Installation Guide ER-K9FWW-IA
Illustrated Parts Breakdown ER-K9FWW-IP
CPU Installation Card ER-PD02U-IN
Memory Installation Card ER-ACSMA–IN
Power Supply Installation Card ER–H7291–IN
ServerWORKS Manager Administrator User's Guide ER–4QXAA–UA
Information on the Internet
Using a Web browser, you can access information about DIGITAL Servers at:
http://www.windowsnt.digital.com/products
Access the latest system firmware either with a Web browser as follows:
http://www.windowsnt.digital.com/support

DIGITAL Server 7300/7300R Series Service Manual 1–1
1
System Overview
This chapter introduces the DIGITAL Server 7300/7300R series systems. These systems
are available in cabinets or pedestals.
The pedestal system has one system drawer and up to three StorageWorks shelves. The
cabinet system can have a combination of system drawers and StorageWorks shelves that
occupy the five sections of the cabinet. There is one system drawer, the BA30A, used
with the DIGITAL Server 7300/7300R series.
Topics in this chapter include the following:
• DIGITAL Server 7300/7300R System Drawer (BA30A)
• Cabinet System
• Pedestal System
• Control Panel and Drives
• System Consoles
• System Architecture
• System Motherboard
• CPU Types

System Overview
1–2 DIGITAL Server 7300/7300R Series Service Manual
• Memory Modules
• System Bus
• System Bus to PCI Bus Bridge Module
• PCI I/O Subsystem
• Server Control Module
• Power Control Module
• Power Supply

System Overview
DIGITAL Server 7300/7300R Series Service Manual 1–3
DIGITAL Server 7300/7300R System Drawer (BA30A)
Components in the BA30A system drawer are located in the system bus card cage,
the PCI card cage, the control panel assembly, and the power and cooling section.
The drawer measures 30 cm x 45 cm (11.8 in. x 17.7 in.) and fully configured weighs
approximately 45.5 kg (~100 lbs).
Figure 1-1 Components of the BA30A System Drawer
PK-0702-96
1
2
5
4
3
When the system drawer is in a pedestal, the control panel assembly is mounted in a tray
at the top of the drawer.
The numbered callouts in Figure 1-1 refer to components of the system drawer.

System card cage, which holds the system motherboard and the CPU, memory, bridge,
and power control modules.

System Overview
1–4 DIGITAL Server 7300/7300R Series Service Manual

PCI/EISA card cage, which holds the PCI motherboard, option cards, and server
control module.

Server control module, which holds the I/O connectors and remote console monitor.

Control panel assembly, which includes the control panel, a floppy drive, and a CD-
ROM drive.

Power and cooling section, which contains one to three power supplies and fans.
Cover Interlocks
The system drawer has three cover interlocks: one for the system bus card cage, one for
the PCI card cage, and one for the power and system fan area. Figure 1-2 shows the cover
interlock circuit. Note that “B305n” in Figure 1-2 stands for either the B3050-AA or
B3052-AA PCI Motherboard.

System Overview
DIGITAL Server 7300/7300R Series Service Manual 1–5
Figure 1-2 Cover Interlock Circuit
OCP
Logic
OCP
Switch
Power SupplyCover
Interlocks
B3040
B305n
POWER_FAULT_L
PCM
Motherboard
LJ-06315
17-04217-01
17-04201-02
DC_ENABLE_L
RSM_DC_EN_L
SCM
17-04201-01
Or17-04302-01
3 Interlock
Switches
To OCP
17-04196-01
70-
32016-
01
70-32016-01
NOTE: The cover interlocks must be engaged to enable power-up. To
override the cover interlocks, find a suitable object to close the
interlock circuit.

System Overview
1–6 DIGITAL Server 7300/7300R Series Service Manual
Cabinet System
The DIGITAL Server 7300/7300R series cabinet system can accommodate multiple
systems in a single cabinet. There are two cabinet variations that can hold different
system configurations. From the outside, the cabinets look almost identical and are of one
basic type. The differences are in power controllers.
Figure 1-3 DIGITAL Server 7300/7300R Cabinet System
PK-0306-96

System Overview
DIGITAL Server 7300/7300R Series Service Manual 1–7
Cabinet Differences
Cabinet Power Mounting Destination
H9A10-EN Two 120 volt
H7600-AA power
controllers
Pull-out tray
(max drawers: 3) North America Asia Pacific
H9A10-EP Two 240 volt
H7600-DB power
controllers
Pull-out tray
(max drawers: 3) Europe
Cabinet System Fan Tray
At the top of cabinet systems is a fan tray containing three exhaust fans, a small 12-volt
power supply, and a module that distributes power to the server control module in each
drawer.
Figure 1-4 Cabinet Fan Tray
PKW0441A-96
Fan LED
Power LED
AC
Power
To SCM

System Overview
1–8 DIGITAL Server 7300/7300R Series Service Manual
Pedestal System
The pedestal system contains one system drawer with a control panel, a CD-ROM drive,
and a floppy drive. In the pedestal control panel area there is space for an optional tape or
disk drive. Three StorageWorks shelves provide up to 90 Gbytes of in-cabinet storage.
Figure 1-5 Pedestal System Front
PK-0301-96
In the pedestal system, the control panel is located at the top left in a tray. There is space
for an optional device beside it.