IBM 7133 Series User manual

7133 SSA Disk Subsystems
Service Guide
SY33-0185-02

7133 SSA Disk Subsystems
Service Guide
SY33-0185-02

Third Edition (September 1996)
This major revision supersedes SY33-0185-01. Technical changes are shown by a vertical line to the left of each change.
The following paragraph does not apply to any country where such provisions are inconsistent with local law:
THIS PUBLICATION IS PRINTED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Some states do not allow disclaimer of express or implied warranties in certain transactions; therefore, this statement may not apply
to you.
This publication could contain technical inaccuracies or typographical errors. Changes are periodically made to the information
herein; these changes will be incorporated in new editions of the publication.
It is possible that this publication may contain reference to, or information about, products (machines and programs), programming,
or services that are not announced in your country. Such references or information must not be construed to mean that such
products, programming, or services will be offered in your country. Any reference to a licensed program in this publication is not
intended to state or imply that you can use only the licensed program indicated. You can use any functionally equivalent program
instead.
Copyright International Business Machines Corporation 1995, 1996. All rights reserved.
Note to U.S. Government Users — Documentation related to restricted rights — Use, duplication, or disclosure is subject to
restrictions set forth in the GSA ADP Schedule Contract.

Contents
Communications Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Federal Communications Commission (FCC) Statement ............... vii
VCCI Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
International Electrotechnical Commission (IEC) Statement .............. viii
Avis de conformitéaux normes de l’Industrie Canada ................. viii
Industry Canada Compliance Statement ......................... viii
United Kingdom Telecommunications Requirements .................. viii
EC Council Directive .................................... viii
Radio Protection for Germany ............................... viii
Safety Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Definitions of Safety Notices .................................. ix
Safety Notice for Installing, Relocating, or Servicing ..................... ix
| Laser Safety Information .................................... x
About This Book ........................................ xi
Numbering Convention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Chapter 1. Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
| SSA Loops and Links ..................................... 1-2
| SSA Connectors of Models 010 and 500 ........................ 1-2
| SSA Connectors of Models 020 and 600 ........................ 1-2
| SSA Fibre-Optic Extender Feature .............................. 1-2
Remote Power On Control Feature ............................. 1-2
|−48 Volt Power Supply (Model 020 Only) .......................... 1-2
Lights and Power Switch ................................... 1-3
Subsystem Lights and Power Switch ........................... 1-3
Disk Drive Module Lights .................................. 1-8
Parts Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
| Parts Locations (Models 010 and 020) ......................... 1-10
| Parts Locations (Models 500 and 600) ......................... 1-11
| Hardware Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
| Models 010 and 500 ................................... 1-12
| Models 020 and 600 ................................... 1-12
Remote-Power-On Control Unit and Cables ....................... 1-13
| SSA Fibre-Optic Extenders and Fiber Optic Cables ................... 1-14
| Fibre-Optic Extender Lights ............................... 1-15
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
| Back Connectors (Models 010 and 020) ........................ 1-16
| Internal Connections (Models 010 and 020) ...................... 1-17
| Back Connectors (Models 500 and 600) ........................ 1-19
| Internal Connections (Models 500 and 600) ...................... 1-20
Mainline-Power Connector (220 V ac and 300 V dc) ................. 1-22
| Mainline-Power Connector (−48 V dc) ......................... 1-22
| Front Connectors (Models 010 and 020) ........................ 1-23
| Front Connectors (Models 500 and 600) ........................ 1-24
Remote-Power-On Control Unit Connectors and Switch ............... 1-25
Power Distribution Schematic ................................ 1-26
Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
Contents iii

| Labels (Models 010 and 020) .............................. 1-27
| Labels (Models 500 and 600) .............................. 1-28
Labels (Disk Drive Modules and Dummy Disk Drive Modules) ........... 1-29
Labels (Dummy Fan-and-Power-Supply Assembly) ................. 1-30
Product Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
| Dimensions and Weight (Models 010 and 020) .................... 1-31
| Dimensions and Weight (Models 500 and 600) .................... 1-32
AC and DC Input-Voltage Requirements ........................ 1-33
| Environment (Models 010 and 020) ........................... 1-33
| Environment (Models 500 and 600) ........................... 1-34
Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
Heat Output (Maximum) ................................. 1-34
Capacities of Disk Drive Modules ............................ 1-34
Power Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
Disk Drive Acclimation .................................... 1-35
| Addressing SSA Disk Drives ................................ 1-36
Location Code Format .................................. 1-36
Pdisks, Hdisks, and Disk Drive Module Identification ................. 1-36
SSA Signal Cards (Models 010 and 500) ......................... 1-37
| SSA Bypass Cards (Models 020 and 600) ........................ 1-38
| Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38
| Forced Inline Mode .................................... 1-39
| Bypass Card Jumpers .................................. 1-40
| SSA Subsystem Configurations .............................. 1-42
| Rules for SSA Loops ................................... 1-42
SSA Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43
| Cable Configurations for Models 010 and 500 .................... 1-44
Larger Configurations for Models 010 and 500 .................... 1-45
| Cable Configurations for Models 020 and 600 .................... 1-51
| Larger Configurations for Models 020 and 600 .................... 1-52
Finding the Physical Location of a Device ........................ 1-58
Finding the Device When Service Aids Are Available ................ 1-58
Finding the Device When No Service Aids Are Available .............. 1-58
| Microcode Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-59
| Adapter Microcode Maintenance ............................ 1-59
| Disk Drive Microcode Maintenance ........................... 1-60
Vital Product Data (VPD) .................................. 1-60
| 1.1 GB, 2.2 GB, 4.5, and 9.0 GB SSA Disk Drives .................. 1-60
Service Inspection Guide .................................. 1-61
Inspection Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61
Checking the Grounding of the 7133 ........................... 1-62
| Grounding Check (Models 010 and 020 with 220 V Fan-and-Power-Supply
| Assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-62
| Grounding Check (Model 020 with −48 V Fan-and-Power-Supply Assemblies) .. 1-64
| Grounding Check (Models 500 and 600) ........................ 1-68
Chapter 2. Problem Determination Procedures .................... 2-1
Disk Drive Module Power-On Self-Tests (POSTs) ..................... 2-1
Installing SSA Extensions to Stand-Alone Diagnostics .................. 2-1
Service Request Numbers (SRNs) .............................. 2-2
The SRN Table ....................................... 2-2
Using the SRN Table .................................... 2-3
FRU Names Used in the SRN Table ........................... 2-3
The SRNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
iv 7133 Service Guide

Software and Microcode Errors ................................ 2-8
Maintenance Analysis Procedures (MAPs) ......................... 2-9
How to Use these MAPs ................................... 2-9
MAP 2010: 7133 –START .............................. 2-2010-1
MAP 2020: 7133 –Power .............................. 2-2020-1
MAP 2021: 7133 –Redundant Power ....................... 2-2021-1
MAP 2022: 7133 –Power-On ............................ 2-2022-1
MAP 2030: 7133 –Remote Power On Control Feature ............. 2-2030-1
| MAP 2330: 7133 –Fibre-Optic Extender ...................... 2-2330-1
MAP 2410: 7133 –Repair Verification ....................... 2-2410-1
| SSA Link Errors ....................................... 2-11
| SSA Link Error Problem Determination ......................... 2-11
| Link Status (Ready) Lights ................................ 2-13
| Fibre-Optic Extender Lights ............................... 2-14
| Link Verification Service Aid ............................... 2-14
Chapter 3. Removal and Replacement Procedures .................. 3-1
Concurrent Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Front Cover –(Early Type) ................................. 3-3
| Front Cover (Late Type) .................................. 3-4
| Front Cover (Models 500 and 600) ............................ 3-5
| Back Cover (Models 500 and 600 Only) ......................... 3-6
All Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
| Power (Models 010 and 020 with 220 V Fan-and-Power-Supply Assemblies) ... 3-8
| Power (Model 020 with −48 V dc Fan-and-Power-Supply Assemblies) ...... 3-10
| Power (Models 500 and 600) .............................. 3-15
Disk Drive Modules ...................................... 3-17
Removing a Module .................................... 3-17
Installing a Module .................................... 3-22
Dummy Disk Drive Modules ................................. 3-28
Fan-and-Power-Supply Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
| Dummy Fan-and-Power-Supply Assembly (Models 010 and 500 Only) ........ 3-34
Control Panel Assembly ................................... 3-36
| Control Panel Assembly (Models 010 and 020) .................... 3-36
| Control Panel Assembly (Models 500 and 600) .................... 3-37
Power-Distribution Tray Assemblies ............................ 3-38
Back-Power Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-41
| Signal Cards and Bypass Cards .............................. 3-43
Front Backplane Assembly ................................. 3-48
Back Backplane Assembly ................................. 3-52
Remote-Power-On Control Unit ............................... 3-55
| Remote-Power-On Control Unit (Models 010 and 020) ............... 3-55
| Remote-Power-On Control Unit (Models 500 and 600) ............... 3-56
Removing a 7133 from a Rack ............................... 3-58
Support Rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-61
Chapter 4. Parts Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
| Assembly 1: 7133 Models 010 and 020 SSA Disk Subsystems ........... 4-2
| Assembly 2: 7133 Models 500 and 600 SSA Disk Subsystems ........... 4-6
Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1
Contents v

vi 7133 Service Guide

Communications Statements
The following statements apply to this product. The statements for other products
intended for use with this product appear in their accompanying manuals.
Federal Communications Commission (FCC) Statement
Note: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual,
may cause interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be
required to correct the interference at his own expense.
Properly shielded and grounded cables and connectors (part numbers 07H9163, 07H8985,
32H1465, 88G6404, 32H1466, or 88G6406, or their equivalents) must be used in order to
meet FCC emission limits. Neither the provider nor the manufacturer is responsible for
any radio or television interference caused by using other than recommended cables and
connectors or by unauthorized changes or modifications to this equipment. Unauthorized
changes or modifications could void the user’s authority to operate the equipment.
This device complies with Part 15 of FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired
operation.
VCCI Statement
The following is a summary of the VCCI Japanese statement in the box above.
This equipment is Type 1 Data Processing Equipment and is intended for use in
commercial and industrial areas. When used in a residential area, or areas of
proximity, radio and TV reception may be subject to radio interference. VCCI-1.
Communications Statements vii

International Electrotechnical Commission (IEC) Statement
This product has been designed and built to comply with (IEC) Standard 950.
Avis de conformité aux normes de l’Industrie Canada
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
Industry Canada Compliance Statement
This Class A digital apparatus meets the requirements of the Canadian
Interference-Causing Equipment Regulations.
United Kingdom Telecommunications Requirements
This apparatus is manufactured to the International Safety Standard EN60950 and as such
is approved in the U.K. under approval number NS/G/1234/J/100003 for indirect
connection to public telecommunications systems in the United Kingdom.
EC Council Directive
This product is in conformity with the requirements of the following EC directives:
Council Directive 73/23/EEC on the harmonization of the laws of the Member States
relating to electrical equipment designed for use within certain voltage limits.
Council Directive 89/336/EEC on the approximation of the laws of the Member States
relating to electromagnetic compatibility.
Neither the provider or the manufacturer can accept responsibility for any failure to
satisfy the protection requirements resulting from a non-recommended modification of
the product, including the fitting of option cards not supplied by the manufacturer.
This product has been tested and found to comply with the limits for Class B
Information Technology Equipment according to CISPR 22 / European Standard
EN 55022. The limits for Class B equipment were derived for typical residential
environments to provide reasonable protection against interference with licensed
communications devices.
Properly shielded and grounded cables and connectors (part numbers 07H9163,
07H8985, 32H1465, 88G6404, 32H1466, or 88G6406, or their equivalents) must be
used in order to reduce the potential for causing interference to radio and TV
communications and to other electrical or electronic equipment. Such cables and
connectors are available from the provider or manufacturer. Neither the provider or
manufacturer can accept responsibility for any interference caused by using other than
recommended cables and connectors.
Radio Protection for Germany
Dieses Gerät ist berechtigt in Übereinstimmung mit dem deutschen EMVG vom 9.Nov.
das EG–Konformitätszeichen zu führen.
Der Aussteller der Konformitätserklärung ist die IBM Germany.
Dieses Gerät erfüllt die Bedingungen der EN 55022 Klasse B.
viii 7133 Service Guide

Safety Notices
For a translation of the danger and caution notices contained in this book, see the Safety
Information manual, SA23-2652.
Definitions of Safety Notices
A danger notice indicates the presence of a hazard that has the potential of causing death
or serious personal injury.
This book contains a danger notice on each of the following pages:
3-9
3-33
A caution notice indicates the presence of a hazard that has the potential of causing
moderate or minor personal injury.
This book contains a caution notice on each of the following pages:
3-58
3-60
An attention notice indicates an action that could cause damage to a program, device,
system, or data.
Safety Notice for Installing, Relocating, or Servicing
Before connecting or removing any cables to or from connectors at the using system, be
sure to follow the steps in the installation or relocation checklist specified in the Installation
and Service Guide for your using system.
For safety checks when servicing, refer to “Service Inspection Guide”on page 1-61.
Safety Notices ix

|Laser Safety Information
|Notes:
| 1. The information given here applies only to 7133s that have the SSA Fibre-Optic
| Extender feature.
| 2. The SSA Fibre-Optic Extender referred to in this information is part of the serial optic
| channel converter assembly.
| This system contains a laser product called the SSA Fibre-Optic Extender. In the United
| States, the SSA Fibre-Optic Extender is certified as a Class 1 laser product that conforms
| to the requirements contained in the Department of Health and Human Services (DHHS)
| regulation 21 CFR Subchapter J. Internationally, the SSA Fibre-Optic Extender is certified
| as a Class 1 laser product that conforms to the requirements contained in the International
| Electrotechnical Commission (IEC) standard 825-1 (1993).
| Class 1 laser products are not considered to be hazardous. The SSA Fibre-Optic
| Extender internally contains an indium gallium arsenide / indium phosphide (InGaAs/InP)
| semiconductor laser diode emitting in the wavelength range of 1280 to 1340 nanometers.
| This laser diode is a Class 1 laser that is rated at 5.0 milliwatts. The design of the SSA
| Fibre-Optic Extender is such that access to laser radiation above a Class 1 level during
| operation, user maintenance, or service conditions is prevented.
Part Number 07H9153
Class 1 Laser Product
FCC Class A - See Manual
| CLASS 1 LASER PRODUCT
| APPAREIL A LASER DE CLASSE 1
| LUOKAN 1 LASERLAITE
|
| TO IEC 825-1:1993
x7133 Service Guide

About This Book
This book provides service information for service representatives who service a 7133
Serial Storage Architecture (SSA) Disk Subsystem. This information is organized as
follows:
Chapter 1 briefly introduces the 7133, and gives useful reference information.
Chapter 2 gives problem determination procedures.
Chapter 3 gives removal and replacement procedures.
Chapter 4 is the parts catalog.
An index is provided at the back of the book.
Numbering Convention
In this book, one gigabyte (GB) equals 1000000000 bytes.
Related Publications
The Installation and Service Guide for your using system
|Diagnostic Information for Micro Channel Bus Systems, SA23-2765
Site and Hardware Planning Information, SA38-0508
|Adapters, Devices, and Cable Information for Micro Channel Bus Systems SA23-2764
|SSA Adapters: User’s Guide and Maintenance Information SA33-3272
|7133 SSA Disk Subsystems: Operator Guide, GA33-3259
|7133 Models 010 and 020 SSA Disk Subsystems: Installation Guide, GA33-3260
|7133 Models 500 and 600 SSA Disk Subsystems: Installation Guide, GA33-3263
Safety Information, SA23-2652.
About This Book xi

xii 7133 Service Guide

Chapter 1. Reference Information
| The 7133 Serial Storage Architecture (SSA) Disk Subsystems can be attached to reduced
| instruction-set computer (RISC) systems. Models 010 and 020 1 are rack-mounted units
| that can be installed in a standard Electrical Industries Association (EIA) 19-inch rack.
| Models 500 and 600 2 are deskside units.
The 7133 can contain up to 16 SSA disk drive modules (eight at the front and eight at the
back).
| The 7133 has fan-and-power-supply assemblies that provide all the power and cooling for
| the 7133. Models 010 and 500 have two or three fan-and-power-supply assemblies,
| subject to configuration requirements. Models 020 and 600 always have three
| fan-and-power-supply assemblies.
The disk drive modules are connected to each other in strings of four modules (two strings
at the front of the 7133, and two strings at the back). These strings can be connected to
each other, to strings in other 7133s, or to SSA adapters. The adapters can be in
separate using systems or in the same using system.
The 7133 can be disconnected from its related SSA adapters while the using system is
running. Also, most of the field-replaceable units (FRUs) of the 7133 can be removed and
replaced while the 7133 and the using system are running. For a list of those FRUs, see
“Concurrent Maintenance”on page 3-1.
The customer’s preinstallation planning information contains information about the system
and its configuration.
Chapter 1. Reference Information 1-1

|SSA Loops and Links
| The disk drive modules of the 7133 are connected through two or more SSA links to an
| SSA adapter that is located in the using system. The disk drive modules, SSA links, and
| SSA adapter are configured in loops. Each loop provides a data path that starts at one
| connector of the SSA adapter and passes through a link (external SSA cable) to the disk
| drive modules. The loop continues through the disk drive modules, then returns through
| another link to a second connector on the SSA adapter.
|SSA Connectors of Models 010 and 500
| At the back of the 7133 are eight SSA connectors for the external SSA cables. Each pair
| of connectors is on a signal card that provides direct connection to a backplane assembly
| in the 7133.
|SSA Connectors of Models 020 and 600
| At the back of the 7133 are eight SSA connectors for the external SSA cables. In Models
| 020 and 600, the signal cards as used in Models 010 and 500 have been replaced by
| bypass cards, each of which has a pair of SSA connectors. Each bypass card provides
| connections to the backplane assemblies of the 7133. If a bypass card loses both of its
| external SSA connections, it automatically reconfigures the SSA loop so that the loop
| remains complete.
| For full details about the operation and configuration of bypass cards, see also “SSA
| Bypass Cards (Models 020 and 600)”on page 1-38.
|SSA Fibre-Optic Extender Feature
| The SSA Fibre-Optic Extender feature permits the 7133 to be connected to SSA adapters
| or other devices (for example, other 7133s) through pairs of fiber optic cables. Each end
| of a pair of fiber optic cables is connected to a Fibre-Optic Extender. The Fibre-Optic
| Extender can be plugged into the SSA connector of a device or adapter. See also “SSA
| Fibre-Optic Extenders and Fiber Optic Cables”on page 1-14.
Remote Power On Control Feature
The Remote Power On Control feature permits the using system to control the electrical
power to the 7133. The feature consists of a control unit, a cable that connects the
control unit to the 7133, and cables that connect the control unit to the using system. See
also “Remote-Power-On Control Unit and Cables”on page 1-13.
|−48 Volt Power Supply (Model 020 Only)
| The −48 Volt Power Supply feature provides fan-and-power supply assemblies and
| three-way power cables that allow the 7133 to be connected to −48 volt power sources.
| The 7133 must be connected to two separate power sources to ensure that operations are
| not interrupted if one power source fails. Two three-way power cables are provided. This
| feature is available only on Model 020.
1-2 7133 Service Guide

Lights and Power Switch
The 7133 has lights that show the status of the subsystem. It also has a power switch.
Each disk drive module has lights that show the status of that module.
Subsystem Lights and Power Switch
Unless otherwise stated, the lights described in this section remain visible when the covers
| of the 7133 are installed. The lights at the back of Models 010 and 020 are not visible
| when the back door of the rack is closed. The diagrams in this section show the 7133
| with covers removed.
|Lights and Power Switch (Models 010 and 020)
Front view
Back view (220 volts)
Back view (-48 volts)
Chapter 1. Reference Information 1-3

1 Power switch (|/ ): This switch controls the internal dc power that is supplied to
the 7133 by the fan-and-power-supply assemblies.
|Note: The diagram shows the Power switch of Model 010. The Power switch of
| Model 020 is slightly different.
| To turn on the dc power on Model 010, press the switch, and hold it pressed for two
| seconds. To turn on the power on Model 020, press and release the switch.
Repeat the action to turn off the dc power. When the dc power is turned off, mainline
power is still present in the fan-and-power-supply assemblies if the 7133 is connected
to the mainline-power source.
| The front cover includes a flap that covers the Power switch to prevent accidental
| operation. On Model 010, the flap pivots upward to open. On Model 020, the flap
| pivots to the right to open.
2 Subsystem Power light ( ): This green light is on when the power switch has
been pressed to turn on the dc voltage, and the dc voltage is present in the 7133.
3 Subsystem Check light ( ): This amber light comes on if a failure occurs in the
7133 subsystem. The subsystem might be able to continue operating satisfactorily
although the failure of a particular part has been detected.
4 Power Card light: This green light is on when electrical power is present on the
card. The light is not visible when the front cover is installed.
5 Fan-and-Power Check light: This amber light comes on and stays on if dc
output from the power supply part of the fan-and-power-supply assembly fails or is
disabled. On 7133s that have the Remote Power On Control feature, the light also
comes on and stays on when power is turned off at the using system or at the
remote-power-on control unit.
If the power supply fails completely, the Fan-and-Power light is turned on by power
from one of the other fan-and-power-supply assemblies in the 7133. The light flashes
if the fan fails.
6 Power light: This green light is on when mainline electrical power is present in
the fan-and-power-supply assembly.
| The −48 volt fan-and-power-supply assembly has two Power lights, which are related
| to the two mainline-power connectors.
|7 Link Status (Ready) light (Model 020 only): This green light shows the status
| of the port (for example, port 1) through which the bypass card is connected to the
| SSA adapter:
|Status of Light|Meaning
|Permanently on|The interface through the bypass card is fully operational.
|Flashing
|(two seconds on,
|two seconds off)
|The interface through the bypass card is not operational.
|Off|The card is in Bypass state or in Forced Inline mode.
1-4 7133 Service Guide

|8 Mode light (Model 020 only): This light shows in which mode the bypass card is
| operating.
|9 Link Status (Ready) light (Model 020 only): This green light shows the status
| of the port (for example, port 2) through which the bypass card is connected to the
| SSA adapter:
|Status of Light|Meaning
|Permanently on
|(Amber)
|The bypass card is switched to Bypass state.
|Permanently on
|(Green)
|The bypass card is jumpered for Forced Inline mode.
|Off|The bypass card is switched to Inline state.
|Status of Light|Meaning
|Permanently on|The interface through the bypass card is fully operational.
|Flashing
|(two seconds on,
|two seconds off)
|The interface through the bypass card is not operational.
|Off|The card is in Bypass state or in Forced Inline mode.
Chapter 1. Reference Information 1-5

|Lights and Power Switch (Models 500 and 600)
Front view Back view
1 Power switch (|/ ): This switch controls the internal dc power that is supplied to
| the 7133 by the fan-and-power-supply assemblies. To turn on the dc power on Model
| 500, press the switch, and hold it pressed for two seconds. To turn on the power on
| Model 600, press and release the switch.
Repeat the action to turn off the dc power. When the dc power is turned off, mainline
power is still present in the fan-and-power-supply assemblies if the 7133 is connected
to the mainline-power source.
2 Subsystem Power light ( ): This green light is on when the power switch has
been pressed to turn on the dc voltage, and the dc voltage is present in the 7133.
3 Subsystem Check light ( ): This amber light comes on if a failure occurs in the
7133 subsystem. The subsystem might be able to continue operating satisfactorily
although the failure of a particular part has been detected.
4 Power Card light: This green light is on when electrical power is present on the
card. The light is not visible when the front cover is closed.
1-6 7133 Service Guide