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Digital Equipment StorageWorks RW546 Service Manual

Small optical disk library
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Small Optical Disk Library
(RW546)
Service Manual
EK–SOL46–SV. B01
Digital Equipment Corporation
Maynard, Massachusetts

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Summary of Contents for Digital Equipment StorageWorks RW546

  • Page 1 Small Optical Disk Library (RW546) Service Manual EK–SOL46–SV. B01 Digital Equipment Corporation Maynard, Massachusetts...
  • Page 2 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. Reproduced with permission of the Hewlett-Packard Company The following are trademarks of DIGITAL Equipment Corporation: the Digital logo and StorageWorks.

  • Page 3: Table Of Contents

    Contents 1 Product Information Product Features ......................1–2 Interface Configurations (RW545/RW546)..............1–2 SCSI Interface Options ................... 1–3 Single-ended SCSI Interface ..................1–3 Differential SCSI Interface ..................1–3 The Optical Drive Mechanism ..................1–3 Magneto–Optical Disks ....................1–4 Product Support ......................1–5 Product Matrix .......................
  • Page 4 Small Optical Disk Library RW546 Service Manual 3 Product Configuration and Operation ( continued Autochanger Configuration Choices ................3–10 Setting a Configuration (“CONF”) ................3–14 Displaying Information Logs..................3–14 Choosing Tests and Displaying Results (“TEST”) ............3–14 Setting the SCSI Address ....................3–16 Securing the Jukebox.....................
  • Page 5 Contents 5 Removal and Replacement Field–Replaceable Assemblies ..................5–2 ESD Precautions ..................... 5–3 Tools Required ....................... 5–3 Assembly/Disassembly Procedures.................. 5–3 Service Access ....................... 5–4 Replacing the Autochanger Controller PCA ............5–6 Replacing Assemblies in the Front Bezel ..............5–8 Replacing the Fan ....................5–10 Replacing the Display ...................
  • Page 6 Small Optical Disk Library RW546 Service Manual 6 Theory of Operation ( continued Drive Defect Management .................... 6–28 Slip Sparing Algorithm ..................6–29 Replacement Sparing Algorithm ................6–30 Error Thresholds ....................6–30 Error Detection and Recovery ..................6–31 Error Detection ...................... 6–32 Error Detection Processes ..................
  • Page 7 Contents Figures (continued) 5–16 Drive Cable Connections 2-Drive (4X)Version ..........5–17 5–17 Right–Side Drive Mounting Screws ............... 5–17 5–18 Left–Side Drive Mounting Screws ..............5–18 5–19 Inserting the C1113 Disk Eject Tool .............. 5–19 5–20 Dismounting the Carriage/Picker Assembly ..........5–20 5–21 Removing the Carriage Shaft .................
  • Page 8 Small Optical Disk Library RW546 Service Manual Tables (continued) 6–2 Physical Revolution to Logical Track Layout ..........6–20 6–3 4X 1,024 Bytes /Sector Disk Sector Structure........... 6–24 6–4 4X 512 Bytes /Sector Disk Sector Structure ............. 6–25 6–5 Technical Comparisons of 1X, 2X, and 4X Optical Drives ....... 6–27 6–6 Error Thresholds .....................
  • Page 9 Revision Record This Revision Record provides a concise publication history of this manual. It lists the guide revision levels, release dates, and reasons for the revisions. It also describes how the changes to affected pages are marked in the manual. Revision Level Date Summary of Changes...

  • Page 10: Common Resource Parts

    About This Manual This manual describes how to install, configure, and maintain the small optical disk library RW546. It also contains a chapter describing the theory of operation. Audience This manual supports trained service personnel for the small optical disk library RW546.
  • Page 11 Small Optical Disk Library RW546 Service Manual Chapter 6: Theory of Operation Describes how the RW546 works and the relationship between the mechanical operation and command set execution. Typographical Conventions The following typographical conventions are used in this manual: Italic Font - Italic font designates the title of a document and statements that need to be emphasized.
  • Page 12 About This Manual Support and Services Who to contact in the Americas Information and Product Questions: Local Sales Office / StorageWorks Hotline 1-800-786-7967 Installation Support: Contact the DIGITAL Distributor where the Storage Solution was Purchased / Local Digital Sales Office. DIGITAL Multivendor Customer Service (MCS) Installation Contact the DIGITAL Customer Support...

  • Page 14: Product Information

    Product Information This chapter provides general product information and lists important features and speci- fications. A matrix of environmental specifications provide parameters for several sub- assemblies. Figure 1–1 The 16-Slot Optical Disk Jukebox - RW546 EK–SOL46–SV. B01 1–1...

  • Page 15: Product Features

    Small Optical Disk Library RW546 Service Manual Product Features The RW546 optical disk jukebox has the following features: • direct on-line access to data • data security through the ability to "lock" the jukebox, preventing disk re- moval. • SCSI Interface •...

  • Page 16: Scsi Interface Options

    Chapter 1. Product Information NOTE For an explanation of the product numbers for each configuration, see the "Product Matrix" in this chapter. SCSI Interface Options Single-ended SCSI Interface (RW545-ZA) With a single-ended SCSI interface the total SCSI cable length allowed between peripherals and the host is 6 meters.

  • Page 17: Magneto-Optical Disks

    Small Optical Disk Library RW546 Service Manual Table 1–1 Jukebox Capacities Disk Capacity/Format Max. Jukebox Capacity 594 Mbyte, 512 bytes/sector 9.5 GBytes 650 Mbyte, 1,024 bytes/sector 10.4 GBytes 1.2 Gbyte, 512 bytes/sector 19.2 GBytes Gbyte, 1,024 bytes/sector 20.8 GBytes Gbyte, 512 bytes/sector 36.8 GBytes 2.6Gbyte, 1,024 bytes/sector 41.6 Gbytes...

  • Page 18: Product Support

    Chapter 1. Product Information Product Support Host support for the jukebox is continually expanding; therefore, specific host system support cannot be provided accurately in this manual. However, host system support is documented in the current Product Service Plan, and the appli- cable Software Product Description (SPD).
  • Page 19 Small Optical Disk Library RW546 Service Manual Optical Disk Jukebox/Drive Mechanism ( continued Technical Characteristics (Drive) Write transfer rate - max sustained For 1,024 bytes/sector – up to 0.84) Mb/s (4X disks) up to 0.62 Mb/s (2X disks) up to 0.52 Mb/s (1X disks, read only) Burst transfer rate (synchronous) 5 Mb/s Burst transfer rate (asynchronous)
  • Page 20 Chapter 1. Product Information Environmental Specifications (continued) Autochanger Drive Media Shock (non-operating) End-use, handling (half-sine) 150 g (3 ms) 5 g (11 ms) 760 mm drop (to 2 mm vinyl-covered concrete) Transportation 30 g (523 cm/s) 30 g (742 cm/s) (trapezoidal) Vibration (5-500 Hz range)
  • Page 21 Small Optical Disk Library RW546 Service Manual Power Requirements Line voltage 100-240V Line frequency 50-60Hz Power consumption (typical) 75 W 238.9 BTU Power consumption (maximum) 100 W 341.3 BTU Service Characteristics Mean time between failure 100,000 power-on hours Mean swaps between failure 1,000,000 Mean time to repair 1 hour...

  • Page 22: Optical Disk Standards Met By Digital Optical Disks

    Chapter 1. Product Information Recording Characteristics (continuous-composite format) Bytes per sector 512/1024(medium depend- 512/1024 (medium 1024 (512) ent) dependent) Sectors per logi- 17/31(medium de- 17/31(medium de- 17(31) cal track pendent) pendent) Logical Tracks 18751 37600 (logical) 75,732 per surface (73,077) Archival life 30 years 30 years...

  • Page 23: Environmental/Installation/Pm

    Environmental/Installation/PM This chapter provides site requirements and preliminary checkout procedures. Environmental Requirements NOTE The environmental requirements listed here apply when the optical disk jukebox is not connected to a Digital system. When this device is connected to Digital systems, the more stringent environmental specifications listed for any single Digital device within the Digital system are applicable and su- persede these specifications.

  • Page 24: Responsibilities

    Small Optical Disk Library RW546 Service Manual Responsibilities Customer site preparation/verification and installation are the customer's or re- seller's responsibility. If the customer/reseller wants Digital to perform the site preparation/verification and/or installation, this should be contracted for on a time-and-materials basis. For the RW546, see the Product Service Plan for further information on time- and-materials billings and for other support policies.

  • Page 25: Preventive Maintenance

    Chapter 2. Environmental/Installation/PM Preventive Maintenance Cleaning Optical Disks Cleaning an optical disk is needed more commonly on standalone drives than with autochangers because of the differences in their environments and usage. However, an autochanger may be used in such a way as to make disk cleaning necessary.

  • Page 26: Cleaning Tools Available

    Small Optical Disk Library RW546 Service Manual Cleaning Tools Available Disks may be cleaned with the Optical Disk Cleaning Kit (C1700-88800). This kit contains swabs and alcohol, cleaning instructions, and a special cartridge holder that keeps the sliding sleeve open. NOTE SCSI -Connect Jukebox If the problem appeared as loss of pefromance...

  • Page 27: Configuring And Operating The Rw546 Jukebox

    Product Configuration and Operation This chapter explains how to cable the optical disk jukebox and explains the configuration parameters. Configuring and Operating the RW546 Jukebox Assembly and Configuration Setting up the optical disk jukebox is the customer/distributor's responsibility; however this service may be contracted for on a time-and-materials basis. Setup instructions for the SCSI-bus jukebox are in the Optical Disk Jukebox Family User’s Guide (EK-RW5XX-UG) which is shipped with the product.

  • Page 28: Jukebox Major Components

    Small Optical Disk Library RW546 Service Manual Jukebox Components Figure 3–1 shows an overview of the major components in the jukebox. Figure 3–1 Jukebox Major Components 3–2 EK–SOL46–SV. B01...
  • Page 29 Chapter 3. Product Configuration and Operationl Disk Drive Either 1 or 2 multifunction optical disk drives for read/write data transfer; 4X versions hold either 1 or 2 drives). The drive(s) use unique SCSI address(es). See Chapter 6, “Theory of Operation”, for additional drive information.

  • Page 30: Shipping Screw Location

    Small Optical Disk Library RW546 Service Manual Removing the Shipping Screw CAUTION Remove the shipping screw from the jukebox be- fore connecting power. Directions for removing the shipping screw are printed on the carton and its location is shown in Figure 3–2 below. NOTE The customer should be encouraged to save the packaging and shipping screw for possible future...

  • Page 31: Rear Panel - Rw546

    Chapter 3. Product Configuration and Operationl Rear Panel Features and Controls Figure 3–3 Rear Panel – RW546 Single-ended Differential 1. Power switch Used to switch on or off all power to the jukebox. SCSI connectors Two SCSI bus format connectors that allow SCSI devices to be daisy-chained.

  • Page 32: Ups Power Requirements

    Small Optical Disk Library RW546 Service Manual Connecting an Uninterruptable Power Supply (UPS) To fully protect against data loss in the event of a power failure, Digital recom- mends the use of an uninterruptable power supply (UPS). The UPS must be a central UPS used by the entire computer system.

  • Page 33: Scsi Cable Lengths

    Chapter 3. Product Configuration and Operationl Connecting the SCSI Cables The jukebox may have either a single-ended or a differential SCSI interface. The total allowable cable lengths for each interface type are as follows: Table 3–2 SCSI Cable Lengths Interface Type Total Allowable Cable Length Single-ended SCSI 4.55 meters...

  • Page 34: Connecting Power

    Small Optical Disk Library RW546 Service Manual Connecting Power CAUTION Verify that the shipping screw has been removed before connecting power. Directions for removing the shipping screw are printed on the carton and its location is shown in Figure 3–2. 1.

  • Page 35: Front Panel

    Chapter 3. Product Configuration and Operationl Front Panel/Control Panel Operations Refer to the following illustration for the location of the front panel controls and features: Figure 3–4 Front Panel 1. Mailslot Allows you to insert or remove optical disks. 2. Selection Control Press these buttons to perform the de- sired operation.

  • Page 36: Autochanger Configuration Choices

    Small Optical Disk Library RW546 Service Manual NEXT is pressed to display the current operation options available such as "LOAD", "TEST", "Information, "Configuration, and "EJECT'', and "SCSI ID'', or to scroll the displayed choice forward by one. PREV is pressed to scroll the displayed choice backward by one.
  • Page 37 Chapter 3. Product Configuration and Operationl Table 3–3 Autochanger Configuration Choices Function Default Options Clear/Save Error Log Save Clear - clears the error log (Information Log 0) immediately. Save - saves the error log until Clear is configured. No Break on Failure Off - if a test encounters a fail- ure, the test stops.
  • Page 38 Small Optical Disk Library RW546 Service Manual Table 3–3 Autochanger Configuration Choices (continued) Function Default Options #12 - Flip Count #14 - Mailslot Rotations Poweron Cartridge On - maintains the status of con- Security(security code required) figuration 15 through a power cy cle or power fail.
  • Page 39 Chapter 3. Product Configuration and Operationl Table 3–3 Autochanger Configuration Choices (continued) Function Default Options Mailslot Rotation Off - Normal mailslot operation. (security code required; If the host sends a Rotate Mailslot see "Setting a New command and this configuration Security Code"...

  • Page 40: Setting A Configuration ("Conf")

    Small Optical Disk Library RW546 Service Manual Setting a Configuration ("CONF") Follow these steps if you wish to set an autochanger configuration. A complete list of the available configurations is given in Chapter 7, "Reference." CONF∗ ∗ READY 1. With displayed, press until displays.
  • Page 41 Chapter 3. Product Configuration and Operationl TEST0 2. Press ENTER displays. 3. Press NEXT PREV until the needed test number displays. ONCE 4. When you press ENTER for the chosen test, displays. ONCE You may accept by pressing ENTER or press NEXT PREV 1000...

  • Page 42: Setting The Scsi Address

    Small Optical Disk Library RW546 Service Manual Setting the SCSI Address NOTE Determine what SCSI device addresses are cur- rently in use on the host system. You can then correctly determine what available SCSI ad- dresses to use for the optical drive mechanism and the autochanger controller.

  • Page 43: Securing The Jukebox

    Chapter 3. Product Configuration and Operationl Securing the Jukebox In its default condition, the jukebox is unsecured. Any user can insert or remove disks or access control panel displays, configurations, or tests. In an open envi- ronment, some precautions should be taken to secure access to the control panel as well as to the following: •...

  • Page 44: Restricting Disk Insertion And Removal

    Small Optical Disk Library RW546 Service Manual CODE1 4. Press ENTER and a flashing is displayed. 5. Press NEXT until the first number of the old or default ( ) security code is displayed. CODE2 6. Press and a flashing is displayed.

  • Page 45: Setting Conf 15 Or Conf 20

    Chapter 3. Product Configuration and Operationl • CONF20 CONF15 – when this is set to ON, the status is maintained when a power fail occurs. Also, the reserved status on mounted surfaces is main- tained if the autochanger power fails. CONF15 CONF20 When setting...

  • Page 46: Moving Or Shipping The Rw546 Jukebox

    Small Optical Disk Library RW546 Service Manual If the autochanger is full, the mailslot will only open for an eject command. • CONF32 – when this is set to ON, the mailslot can be rotated open or closed from the control panel or it allows the host to control mailslot rota- tion using a SCSI Rotate Mailslot command.

  • Page 47: Shipping The Jukebox

    Chapter 3. Product Configuration and Operationl 1. Switch off the power switch (located on the back panel). 2. Remove the power cord and SCSI cable connections. 3. Carefully move the jukebox to its new destination. 4. Connect the jukebox to the host. 5.

  • Page 48: Replacing The Shipping Screw

    Small Optical Disk Library RW546 Service Manual 6. Lay the jukebox on its side and replace the shipping screw (see Figure 3-5). NOTE If the shipping screw has been misplaced, you can use a cap screw with the following specifications: •...

  • Page 49: Troubleshooting And Diagnostics

    Troubleshooting and Diagnostics This chapter lists possible problems which might occur during installation and provides possible solutions for those problems. Diagnostic tests are also discussed. Operation/Installation Troubleshooting - RW546 Jukebox There are four main sections in this chapter: • Operation/Installation Error Information – Lists common problems encoun- tered during operation and installation of the optical disk jukebox and gives suggestions for solving these problems.
  • Page 50 Small Optical Disk Library RW546 Service Manual Table 4–1 Sequence Tests Test Name Description Poweron Checks all digital data paths and normal machine operation. This test runs the same se quence of TESTS as when initiated by an actual power on, but does NOT do all operations (see below).

  • Page 51: Exerciser Tests

    Chapter 4. Troubleshooting and Diagnostics Table 4–1 Sequence Tests (continued) Test Name Description Initialize Prepares the unit for movement. Mechanism Sequence Order: Initialize RAM variables to defaults 50 - Find Home Exerciser Tests Table 4–2 Exerciser Tests Test Name Description Initialize Functions the same as the SCSI Initialize Element Status command.
  • Page 52 Small Optical Disk Library RW546 Service Manual Table 4–2 Exerciser Tests (continued) Test Name Description Mailslot I/O Makes a combination of moves with a PASS/FAIL re sult. It moves a cartridge from the lowest- numbered full slot to the mailslot with a random flip. It then moves the cartridge back to its original slot with its original orientation.

  • Page 53: Electronic Core Tests

    Chapter 4. Troubleshooting and Diagnostics Table 4–3 Electronic Core Tests Test Name Description Microprocessor Does a functional check of the microprocessor. Operation Test This test must shut down the servo system; a FIND HOME sequence is run when this test finishes. Does a checksum verification of the ROM.
  • Page 54 Small Optical Disk Library RW546 Service Manual Table 4–3 Electronic Core Tests (continued) Test Name Description Test Same as 42. (interactive - if done through the The display shows MOO VO BO. control panel) MOO - is the portion of the display that applies to the mailslot sensor test.

  • Page 55: Accessing And Running Internal Diagnostic Tests

    Chapter 4. Troubleshooting and Diagnostics Table 4–3 Electronic Core Tests (continued) Test Name Description Calibrate Calculates a min/max clearance of the second Magazines (near-center) storage slot in each storage slot group. Storage slots 2,6,10, and 14 must be empty.) Requires a disk in the mailslot.

  • Page 56: Operation /Installation Troubleshooting

    Small Optical Disk Library RW546 Service Manual NOTE Any test may be stopped, at any time, by pressing CANCEL. The jukebox will stop the test after it completes its current activity. (Test 39, the key test, requires CANCEL to be pressed twice.) 5.

  • Page 57: Error And Performance Logs

    Chapter 4. Troubleshooting and Diagnostics Error and Performance Logs The logs listed below are accessible from the control panel by using the INFO option. Chapter 4, has instructions for using these information logs. Table 4–4 Information Logs No. Log Name Description Autochanger A time-stamped history of diagnostic test errors.
  • Page 58 Small Optical Disk Library RW546 Service Manual Table 4–4 Information Logs (continued) No. Log Name Description Current Move Displays the number of successful moves since the Success Count most recent autochanger hard failure. Move Success Displays the average of the values in Log 10 Move Average Success Log.

  • Page 59: The Find Home Sequence And Information Logs

    Chapter 4. Troubleshooting and Diagnostics Table 4–4 Information Logs (continued) Log Name Description Stack Tilt Not valid for this model of jukebox. Reports 0. Minimum Clearance Minimum clearance for cartridge insertion into a Storage Slot group 1 magazine or storage slot. Up/down clearance is Storage Slot group 2 the value calculated by test 65.
  • Page 60 Small Optical Disk Library RW546 Service Manual The following sequence lists each large movement in the FIND HOME se- quence. If there is a problem during a movement, the most likely hardware errors are listed after the movement in descending order of probability. Hardware error numbers and recovery procedures are listed in Chapter 4.

  • Page 61: List Of Micro-Move Reference Table

    Chapter 4. Troubleshooting and Diagnostics 5. Find orientation of the picker (MMID# 1, 2, 53, 54, 7, 8) Possible error #1: – 4A--motion error while determining the orientation of the picker Possible error #2: – 4C--failed flip motion during the Find Home sequence 6.
  • Page 62 Small Optical Disk Library RW546 Service Manual Table 4–5 List of Micro-Move Reference Table (continued) Move ID Description (hex.) Move fingers toward drive with intent to grab cartridge Pull fingers back from drive with cartridge Insert cartridge into drive until slider engages Insert cartridge into drive after slider has engaged Move fingers with cartridge toward the drive, determining distance of cartridge in drive.
  • Page 63 Chapter 4. Troubleshooting and Diagnostics Table 4–5 List of Micro-Move Reference Table (continued) Move ID Description (hex.) Check for a cartridge in the drive Move carriage to drive bang position Verify the presence of a cartridge by pressing cartridge against drive face Short carriage motion to check for cartridge sticking out of a storage slot after insertion (toward drive)
  • Page 64 Small Optical Disk Library RW546 Service Manual Table 4–5 List of Micro-Move Reference Table (continued) Move ID Description (hex.) Verify the maximum required carriage travel from the drive Test for presence of cartridge by pushing against hard stop Long carriage motion during carriage/picker assembly calibration Short carriage motion during carriage /picker assembly calibration (fine measure) Error occurred while inserting cartridge, push cartridge farther into stor-...

  • Page 65: Operation Errors - Scsi Connect Jukebox

    Chapter 4. Troubleshooting and Diagnostics CAUTION DO NOT CYCLE POWER during any trouble- shooting until you are sure the system SCSI bus is INACTIVE and will REMAIN INACTIVE. Removing power while the bus is active can cause data loss and/or indeterminate bus states. Check the host system reference manuals for information on checking the status of the SCSI bus.
  • Page 66 Small Optical Disk Library RW546 Service Manual Table 4–6 Operation Errors – SCSI Connect Jukebox (continued) Task Problem/Symptom What to do Loading Disks Disk inserted in mail- Remove the disk from the mailslot, mail- slot, but the display slot and try inserting it again. Push the reads ERROR, disk in, shutter-end first, so that the disk EMPTY, or MISLOAD...
  • Page 67 Chapter 4. Troubleshooting and Diagnostics Table 4–6 Operation Errors – SCSI Connect Jukebox (continued) Task Problem/Symptom What to do Host computer power After the host reboots, file system check fails and the auto- any write-mounted surfaces. changer stays on. Both the host system After the host reboots, file system check and autochanger power any write-mounted surfaces.
  • Page 68 Small Optical Disk Library RW546 Service Manual Table 4–6 Operation Errors – SCSI Connect Jukebox (continued) Task Problem/Symptom What to do • Check the file system access per Reading/writing Can't write to the disk. magneto-optical missions. disks • Check the write-protect tab on each disk side to assure write-enabled status.

  • Page 69: Power-On Selftest

    Chapter 4. Troubleshooting and Diagnostics Power-on Selftest CAUTION When the optical disk jukebox is powered on and selftest is run, the SCSI interface and the termina- tor must both be either connected or discon- nected. If the controller senses that the optical drive is not connected to a host system via the SCSI inter- face, additional selftests are run on the SCSI cir- cuitry.

  • Page 70: Optical Disk Cleaning - All Jukeboxes

    Small Optical Disk Library RW546 Service Manual To remove the cover and side access panel 1. Remove power from the jukebox. 2. Remove the four T-25 screws that hold the cover to the rear panel. 3. Slide the cover toward the rear of the unit. Slots on the bottom of the cover will slide off their rests.

  • Page 71: Cleaning Tools Available

    Chapter 4. Troubleshooting and Diagnostics The following are recommendations for preventing contamination of disks and the disk drive: • Place the jukebox away from high traffic areas. • Do not leave a disk in the drive for extended periods of time if possible. •...

  • Page 72: Troubleshooting Using The Control Panel And Observation

    Small Optical Disk Library RW546 Service Manual A disk can be removed from the drive while the drive is still secured in the auto- changer. Follow the service access procedures in Chapter 5 to access the front of the drive mechanism, and then do the following steps to remove a disk from the drive: 1.

  • Page 73: The Autochanger Lists The First "Possibles

    Chapter 4. Troubleshooting and Diagnostics Figure 4–1 Information and Tests Through the Control Panel The Autochanger Lists the First "Possibles" At poweron, and after every failed move, the autochanger automatically runs an initialization sequence that comprehensively tests the autochanger. If a hard fail- ure occurs, a list of possible FRUs that may have been at fault is returned.
  • Page 74 Small Optical Disk Library RW546 Service Manual NOTE This test sequence returns possible failed FRUs only if there has been a hard failure. The test se- quence will NOT find an failure from which a re- covery was made. This test sequence, called the "FRU Isolation Test"...

  • Page 75: How To Use The Results Of The Internal Tests

    Chapter 4. Troubleshooting and Diagnostics How to Use the Results of the Internal Tests Similar to treating symptoms rather than the real problem, the suspect FRUs given by the FRU isolation test may actually mask the root cause of the problem. The hard move error that caused the autochanger to run the FRU isolation test may have only been a PRODUCT of the actual problem.

  • Page 76: The Fru Isolation Test Sequence

    Small Optical Disk Library RW546 Service Manual An example: Say the autochanger fails with an error code of 4D (hexadecimal), "MOTION ERROR CHECKING FOR CARTRIDGE IN THE PICKER," and lists the picker (FRU 27) as the most likely failure. However, when you observe the unit while running the “Wellness Test”...

  • Page 77: Error And Performance Logs

    Chapter 4. Troubleshooting and Diagnostics 6. Move carriage/picker assembly away from the drive. The move has to be far enough to be certain that the leadscrew can move, but not so far that a jammed cartridge will cause the test to fail.(eliminates the carriage lead- screw assembly) If the FRU isolation test has been run from the front panel, the FIND HOME sequence will automatically be executed at this point.

  • Page 78: Verification/Recovery From Hardware Errors

    Small Optical Disk Library RW546 Service Manual Verification/Recovery from Hardware Errors When a hardware failure occurs, a message is displayed on the control panel. If the failure occurs during the poweron sequence, FAIL1 is displayed. If the fail- ure occurs at some other time, MISLOAD or FAIL0 is displayed. If a failure oc- curs while you are running a test, FAIL# # is displayed, where # # is the number of the test that failed.
  • Page 79 Chapter 4. Troubleshooting and Diagnostics Table 4–7 Recovery for Specific Hardware Errors (continued) Run test 30 -- Microprocessor Operation Test -- verify failure, Microprocess or Test Error Recovery procedures for error codes 05, 06, and 07 are handled Controlled in the same manner: Area of RAM Recycle Power -- verify failure.
  • Page 80 Small Optical Disk Library RW546 Service Manual Table 4–7 Recovery for Specific Hardware Errors (continued) See note preceeding error 0B. SCSI Control- ler Message Error See note preceeding error 0B. SCSI Control- ler Command Error See note preceeding error 0B. SCSI Control- ler Kill Error See note preceeding error 0B.
  • Page 81 Chapter 4. Troubleshooting and Diagnostics Table 4–7 Recovery for Specific Hardware Errors (continued) LOOPBACK ERRORS - (SCSI-connect only) All recovery procedures for loopback errors are handled in the same manne: Run test 41 – (SCSI Connec- tor Loopback Test using loop- back connector 88780- 60095) –...
  • Page 82 Small Optical Disk Library RW546 Service Manual Table 4–7 Recovery for Specific Hardware Errors (continued) See note preceeding error 18. SCSI Con- nector Loop- back Error in DB4 or ACK See note preceeding error 18. SCSI Con- nector Loop- back Error in DB5 or ATN See note preceeding error 18.
  • Page 83 Chapter 4. Troubleshooting and Diagnostics Table 4–7 Recovery for Specific Hardware Errors (continued) MOTOR CONTROL IC ERRORS Recovery procedures for motor control IC errors are handled in the same manner: Run test 36 (Motor Control Chip Test) – verify failure for tests 2C thru 2E.
  • Page 84 Small Optical Disk Library RW546 Service Manual Table 4–7 Recovery for Specific Hardware Errors (continued) MECHANISM ERRORS Check carriage/picker for free motion. The carriage should travel easily along the rail. See note above. Run test 11 – Autochanger Mechanism Exercise Unspecified Test.
  • Page 85 Chapter 4. Troubleshooting and Diagnostics Table 4–7 Recovery for Specific Hardware Errors (continued) See note above. Carriage motion failure during Find Home se- quence See note preceeding error 44. Unable to free picker fingers See note preceeding error 44. Carriage motion failed while initializ- ing Home...
  • Page 86 Small Optical Disk Library RW546 Service Manual Table 4–7 Recovery for Specific Hardware Errors (continued) See note preceeding error 4a. Motion error checking for cartridge in the picker Recovery procedures for error codes 4E through 52 are all han- dled in the same manner: Check the optical sensor, if necessary.
  • Page 87 Chapter 4. Troubleshooting and Diagnostics Table 4–7 Recovery for Specific Hardware Errors (continued) EXERCISER TEST ERRORS No FRUs failed. Run test 10 to initialize the element status. Need to issue Initialize Status com- mand No FRUs failed. Check cartridge configuration. Invalid test Check that the cartridge configuration (number and location) are configuration...
  • Page 88 Small Optical Disk Library RW546 Service Manual Table 4–7 Recovery for Specific Hardware Errors (continued) CALIBRATION SENSOR SYSTEM ERRORS 60-61 Run test 51 -- Carriage/Picker Assy Calibration -- verify failure. Home sensor failed MAILSLOT/STORAGE SLOT ERRORS Check for loose labels or other obstructions in errors that in- volve the mailslot (B0-B2).
  • Page 89 Chapter 4. Troubleshooting and Diagnostics Table 4–7 Recovery for Specific Hardware Errors (continued) DRIVE ERRORS The autochanger only checks for the PRESENCE of a drive. To run complete drive tests requires an external diagnostic: On drive error codes, check all cabling to/from the drive: –...
  • Page 90 Small Optical Disk Library RW546 Service Manual Table 4–7 Recovery for Specific Hardware Errors (continued) FRU DETECTION TEST ERRORS Check carriage/picker for free motion. The carriage should travel easily along the rail; you should be able to easily flip the picker using the picker belt.

  • Page 91: Getting Error Information Through The Scsi Bus

    Chapter 4. Troubleshooting and Diagnostics Table 4–7 Recovery for Specific Hardware Errors (continued) MISCELLANEOUS ERRORS The test can only be run from the control panel. The test can only be run from the SCSI interface. The test did not run; probably a configuration error. Invalid test number.

  • Page 92: Diagnostics

    Small Optical Disk Library RW546 Service Manual Figure 4–4 Information and Tests Through the SCSI Bus Refer to the following information when troubleshooting through the SCSI bus: Offline Diagnostics for Digital Optical Storage. This offline diagnostic, DOSDASS2 can be used to access the above information through the SCSI bus.

  • Page 93: Internal Diagnostics Tests

    Chapter 4. Troubleshooting and Diagnostics DOSDASS2 fully exercises either standalone multifunction optical drives or autochangers that contain multifunction optical drives. Internal Diagnostic Tests An extensive set of internal diagnostic tests is available for the autochanger. Ex- cept for the poweron sequence test, the running of tests is not automatic. The op- erator may initiate each test from the control panel.
  • Page 94 Small Optical Disk Library RW546 Service Manual Procedure To display test information and to choose tests to execute, access the TEST tion using the following steps. 1. With the autochanger power on and in the READY state, press NEXT TEST# displays. 2.

  • Page 95: Removal And Replacement

    Removal and Replacement This chapter describes how to remove and replace repairable assemblies of the RW546 jukebox. Contents Service Access..................5–4 Replacing the Autochanger Controller PCA..........5–6 Replacing Assemblies in the Front Bezel ..........5–8 Replacing the Fan ................5–10 Replacing the Display................. 5–11 Replacing the Mailslot Assembly............

  • Page 96: Field-Replaceable Assemblies

    Small Optical Disk Library RW546 Service Manual Field-Replaceable Assemblies The jukebox contains the following major assemblies: • multifunction optical drive mechanism • mailslot assembly • power supply • front panel assembly • leadscrew assembly • picker/carriage assembly • autochanger controller PCA WARNING DO NOT DISASSEMBLE the optical drive...

  • Page 97: Esd Precautions

    Chapter 5. Removal and Replacement Precautions The optical disk jukebox contains very sensitive electrical components. It is EXTREMELY IMPORTANT that you follow the proper procedures for prevent- ing ESD (Electrostatic Discharge). Use wrist-grounding straps, anti-static mats, and anti-static work stations when removing and replacing the major assemblies. CAUTION Failure to follow proper procedures could lead to intermittent failures and/or premature hard failures...

  • Page 98: Service Access

    Small Optical Disk Library RW546 Service Manual Service Access 1. Remove power from the jukebox. Switch off the power switch on the power module on the rear panel. 2. Unplug the power cord from the power module. 3. Remove the jukebox cover by removing the four T-25 screws on that hold the cover to the rear panel.

  • Page 99: Removing The Access Panel

    Chapter 5. Removal and Replacement Figure 5–2 Removing the Access Panel 6. Remove the picker umbilical cable shield rod. Pull the rod out through the top of the chassis Figure 5–3 Removing the Picker Umbilical Cable Shield Rod When re-assembling: The rod fits it into a hole at the bottom of the chassis. BE SURE THAT YOU PLACE THE PICKER UMBILICAL CABLE OUTSIDE THE ROD.

  • Page 100: Replacing The Autochanger Controller Pca

    Small Optical Disk Library RW546 Service Manual When replacing the access panel, MAKE SURE THAT THE COVER DOES NOT PINCH THE LARGE POWER CABLE ASSEMBLY that lays along the bottom of the chassis. Replacing the Autochanger Controller PCA 1. Follow the steps in the service access procedure at the beginning of this chapter to remove the outside cover and side access panel.

  • Page 101: Controller Pca Cables

    Chapter 5. Removal and Replacement Small NOTE It is easier to remove the drive I/O and front panel cable if you remove the three T-15 mounting screws that hold the PCA to the bottom of the chassis. Pull the controller PCA out of the two tab holes that hold up the opposite side of the board.

  • Page 102: Replacing Assemblies In The Front Bezel

    Optical Disk Library RW546 Service Manual After the controller PCA is loose (see the previous Note), disconnect the following: • Drive I/O and front panel cable 3. Remove the controller PCA from the chassis. 4. Switch power on to the jukebox, and set configurations 16 and 18. (See "Setting a Configuration"...

  • Page 103: Front Bezel Mounting Screws

    Chapter 5. Removal and Replacement Small Figure 5–7 Front Bezel Mounting Screws 4. Rotate the front bezel out and disconnect the front panel cable and the mailslot sensor cable. NOTE A tab on the top of the mailslot sensor cable must be released before the cable can be unhooked.

  • Page 104: Replacing The Fan

    Optical Disk Library RW546 Service Manual Figure 5–8 Front Panel Tilted Out Replacing the Fan 1. Follow the steps in "Accessing Components in the Front Bezel" in the previous section. Figure 5–9 Replacing the Fan 5–10 EK–SOL46–SV. B01...

  • Page 105: Replacing The Display

    Chapter 5. Removal and Replacement Small 2. Remove the two T-15 screws that secure the fan grill to outside of the front bezel. 3. Turn the fan counterclockwise (looking from the back of the bezel) to release the two fan mounting tabs from the slots in the front bezel and remove the fan.

  • Page 106: Replacing The Mailslot Assembly

    Optical Disk Library RW546 Service Manual Figure 5–10 Replacing the Display When Reassembling: • Hold the display in place while re-attaching it to the front bezel to avoid damaging the display. Replacing the Mailslot Assembly 1. Follow the steps in "Accessing Components in the Front Bezel" in the previous section.

  • Page 107: Mailslot Mounting Screws

    Chapter 5. Removal and Replacement Small Figure 5–11 Mailslot Mounting Screws Figure 5–12 Mailslot Mounting Thumbscrew EK–SOL46–SV. B01 5–13...

  • Page 108: Replacing The Optical Drive Mechanism

    Optical Disk Library RW546 Service Manual When Reassembling: • When re-inserting the mailslot into the chassis, lift up on the mailslot assembly from inside the chassis to ensure the mailslot is seated properly on the guides. Replacing the Optical Drive Mechanism NOTE optical drive...

  • Page 109: Fastening Picker To The Service Position

    Chapter 5. Removal and Replacement Small Figure 5–13 Removing the RFI Shield Figure 5–14 Fastening Picker to the Service Position 5. Remove the power cable, drive interface cable, and SCSI cable from the rear of the drive mechanism. EK–SOL46–SV. B01 5–15...
  • Page 110 Optical Disk Library RW546 Service Manual Figure 5–15 Drive Cable Connections – 1 drive version 5–16 EK–SOL46–SV. B01...

  • Page 111: Right-Side Drive Mounting Screws

    Chapter 5. Removal and Replacement Small Figure 5–16 Drive Cable Connections – 2-drive (4X) version 6. Remove the two T-10 screws that hold the side of the drive to the chassis on the side as shown in Figure 5-16. Figure 5–17 Right-Side Drive Mounting Screws 7.

  • Page 112: Manually Removing Disks From Drives

    Optical Disk Library RW546 Service Manual Figure 5–18 Left-Side Drive Mounting Screws When Reassembling: • Verify that the drive contains the correct firmware revision Manually Removing Disks From Drives The optical drive mechanism does not automatically eject a disk from the drive if a power failure occurs.

  • Page 113: Inserting The C1113 Disk Eject Tool

    Chapter 5. Removal and Replacement Length: 50 mm Width: 2.45 mm Thickness: 0.5 mm A disk can be removed from the drive while the drive is still secured in the autochanger. Follow the service access procedures which access the front of the drive mechanism, and then do the following steps to remove a disk from the drive: 1.

  • Page 114: Replacing The Picker/Carriage Assembly

    Small Optical Disk Library RW546 Service Manual Replacing the Picker/Carriage Assembly 1. Follow the steps in the service access procedure at the beginning of this chapter to remove the outside cover and side access panel. 2. Lay the jukebox on its side. 3.

  • Page 115: Removing The Carriage Shaft

    Chapter 5. Removal and Replacement Figure 5–21 Removing the Carriage Shaft 7. Remove the picker assembly by lifting up on the side of the picker that was nearest to the carriage shaft, and then rotating the picker to a horizontal position. Carefully lift the picker assembly out of the chassis. When Reassembling: •...

  • Page 116: Replacing The Leadscrew Assembly

    Small Optical Disk Library RW546 Service Manual Replacing the Leadscrew Assembly 1. Follow the steps in the service access procedure at the beginning of this chapter to remove the outside cover and side access panel. 2. Remove the T-15 screw that secures the leadscrew assembly to the carriage/picker assembly (this screw is sealed with Loctite®).

  • Page 117: Fastening Picker To The Service Position

    Chapter 5. Removal and Replacement Figure 5–23 Fastening Picker to the Service Position 5. Disconnect the power and encoder cables from the controller PCA. 6. Squeeze the tip of the two cable clamps that protrude out from the bottom of the chassis (see Figure 5–24). This releases the clamp, allowing you to pull the clamp away from the large power cable bundle that runs along the bottom of the chassis.

  • Page 118: Loosening The Power Cable Clamps

    Small Optical Disk Library RW546 Service Manual Figure 5–24 Loosening the Power Cable Clamps 7. Remove the two T-15 screws that secure the leadscrew base to the bottom of the chassis (see Figure 5–25). NOTE Lift the leadscrew out carefully to prevent the bearings from falling off the top of the leadscrew.

  • Page 119: Removing The Leadscrew Assembly

    Chapter 5. Removal and Replacement Figure 5–25 Removing the Leadscrew Assembly When re-assembling: • (Refer to Figure 5-26 when replacing the leadscrew assembly.) • Verify that the bearings are positioned correctly at the top of the leadscrew. • Align the tabs on the leadscrew base with the slots in the autochanger chassis and replace the two screws that secure the base to the chassis.

  • Page 120: Preparing The Leadscrew Assembly For Replacement

    Small Optical Disk Library RW546 Service Manual Figure 5–26 Preparing the Leadscrew Assembly for Replacement 5–26 EK–SOL46–SV. B01...

  • Page 121: Replacing The Power Supply

    Chapter 5. Removal and Replacement Replacing the Power Supply 1. Switch off the power switch on the power supply module on the rear of the chassis. 2. Unplug the power cord from the power module. 3. Remove the T-25 screws that secure the power supply assembly to the back panel.

  • Page 122: Replacing The Magazine Guides

    Small Optical Disk Library RW546 Service Manual NOTE If the jukebox interface is differential SCSI, the SCSI interconnect cable (differential PCA-to- chassis rear panel) must also be disconnected before the power supply module is pulled away. 5. Remove the power supply assembly by lifting the supply up and away (there are tabs on the left edge of the supply).

  • Page 123: Replacing The Scsi Cable

    Chapter 5. Removal and Replacement When Reassembling: Place the magazine so that its tabs (#1 and #3) go into the slots in the chassis. Slide the magazine in and forward until the snap lock (#2) slips into its slot. Replacing the SCSI cable NOTE Assemblies that must be removed prior to replacing the SCSI cable are:...
  • Page 124 Small Optical Disk Library RW546 Service Manual whether the autochanger should report recovered errors (CONF27) whether the autochanger should rotate the mailslot inwards when in secure mode (CONF31) whether the autochanger should automatically initialize element status when cartridges are found in unexpected places (ROM-dependent) •...

  • Page 125: Variables Set By Configuration 18

    Chapter 5. Removal and Replacement clear Runtime Log (INFO 11) clear number of major retries clear number of inline retries Reset the password to 0 0 0 Variables Set by Configuration 18 • Reset the move odometer to zero (INFO 9) •...

  • Page 126: Non-Exchange Assemblies

    Small Optical Disk Library RW546 Service Manual Table 5–1 Non-Exchange Assemblies (See Figure 5–29) Part Number Description Used by: C1100-60x03 Autochanger controller PCA SCSI C1100-60x77 Front panel assembly SCSI C1100-60x26 Magazine guides (2) SCSI C1100-60x28 Power supply - single-ended SCSI SCSI interface C1100-60x30...

  • Page 127: Rw546 Exploded View

    Chapter 5. Removal and Replacement Figure 5-29 RW546 Exploded View (1 of 3) EK–SOL46–SV. B01 5–33...
  • Page 128 Small Optical Disk Library RW546 Service Manual Figure 5-29 RW546 Exploded View (2 of 3) 5–34 EK–SOL46–SV. B0...
  • Page 129 Chapter 5. Removal and Replacement Figure 5-29 RW546 Exploded View (3 of 3) EK–SOL46–SV. B01 5–35...

  • Page 130: Field Replaceable Units

    Small Optical Disk Library RW546 Service Manual Field Replaceable Units (FRU) in the (Small) Library Table 5–2 is a list of FRU’s in the Small Optical Disk Library RW546. The information includes a cross-reference between Digital and vendor part numbers, a description of the unit, the standard cost in US $, the Mean Time Between Failures for the assembly in hours (x 1000), and the repair cost in US $.

  • Page 131: Recommended Service Kits

    Chapter 5. Removal and Replacement Recommended Service Kits The initial recommended service for the optical jukebox includes the exchange parts list and the non-exchange parts list for stocking at a field-level office. NOTE The “x” in the part numbers listed in the following parts tables represents a number from “0”...

  • Page 132: Miscellaneous

    Small Optical Disk Library RW546 Service Manual Miscellaneous While no special tools are required to service the optical jukebox, there are some commonly used items that may be stocked and available as an area resource. Table 5–4 Common Resource Parts Item HP Part Number 0.5 m (1.6 ft.) SCSI peripheral interface cable...

  • Page 133: Theory Of Operation

    Theory of Operation This chapter describes how the hardware and software work together in the library to produce the robotics of the RW546. This chapter discusses the following aspects of the robotics of the RW546 optical disk jukebox. • the autochanger •...

  • Page 134: Scsi Command Translation For Autochanger Operation

    Small Optical Disk Library RW546 Service Manual Figure 6–1 SCSI Command Translation for Autochanger Operation Examples of high-level commands are: • Move/Exchange -- move a cartridge from element A to element B. • Seek -- position the transport at a target element •...

  • Page 135: Mechanics

    Chapter 6. Theory of Operation 4. Do a flip. 5. Move the picker to the front of the disk insertion slot on the drive element. 6. Put the cartridge into the drive element. The basic autochanger functions (macro-moves) are then divided into a series of smaller movements called "micro-moves."...

  • Page 136: The Autochanger Controller Pca

    Small Optical Disk Library RW546 Service Manual The picker/carriage assembly is the heart of the mechanism. This assembly posi- tions disks in front of storage slots, drive, and the mailslot. The picker inserts, removes, and flips disks. It also activates the mailslot mechanism. The carriage/picker assembly includes active payload electronics that are similar in design to a plotter's.

  • Page 137: Autochanger Controller Pca Block Diagram

    Chapter 6. Theory of Operation Figure 6–2 Autochanger Controller PCA Block Diagram The MICROPROCESSOR is a Motorola MC68EC000 running at 12.288 MHz. This microprocessor controls all processes on the controller PCA such as servos, SCSI interface, and commands to the control panel. Associated with the microprocessor is clocking circuitry, RAM with standby power supplied by a capacitor, and ROM.

  • Page 138: The Power Supply

    Small Optical Disk Library RW546 Service Manual The ASIC is also the interface between the processor and the motors. The ASIC reads the position encoders and uses that information to increment or decrement counters on the chip. The ASIC also provides pulse width modulation (PWM) output signals to drive the motor circuitry.

  • Page 139: The Multifunction Optical Drive And Drive Controller

    Chapter 6. Theory of Operation The Multifunction Optical Drive and Drive Controller Figure 6–3 Functional Diagram EK–SOL46–SV. B01 6–7...

  • Page 140: Controller Pca

    Small Optical Disk Library RW546 Service Manual There are four major sub-assemblies within the optical drive: Controller PCA The controller PCA is a microprocessor-based collection of digital electronics that handles functions performed by a SCSI controller, a data buffer, and a for- matter/sequencer.

  • Page 141: Mechanism Assembly

    Chapter 6. Theory of Operation DSP Microprocessor and Support/Servo Control Loops Most of the electronics on the servo PCA is analog circuitry. This circuitry is designed into the control loops of the following servos: spindle motor/speed, la- ser power control, track following, seek/position maintenance, focus actuation, fine position actuation, and coarse position actuation.

  • Page 142: 4X Drive Mechanism

    Small Optical Disk Library RW546 Service Manual Optical Head A major feature of the optical head is a "split optics" design. This design physi- cally separates the laser diode and its associated detectors from the focus/fine position actuators. This design results in a significant seek time performance ad- vantage due to less mass on the moving portion of the optical head.
  • Page 143 Chapter 6. Theory of Operation Controller The controller is a highly-specialized integrated circuit that handles SCSI con- trol, data buffering, and encode/decode. The data buffer function provides a buffer to speed match transfers to and from the host computer and the optical disk. The data buffer provides a cache for read and write operations, optimizing the speed of these transfers.
  • Page 144 Small Optical Disk Library RW546 Service Manual Loading Motor The loading motor loads and unloads the optical disk cartridge. The loader mo- tor includes a gear train and rack-and-pinion system that allow the cartridge shuttle to raise and lower the cartridge within the loader housing. Bias Magnet The bias magnet subassembly sits on top of the cartridge shuttle and provides the correct polarity for erasing or writing data.

  • Page 145: Optical Disk Layout And Error Correction

    Chapter 6. Theory of Operation Optical Disk Layout and Error Correction Disk Formats Two optical disk formats are available. The Digital RWZ53 optical drive can read from and write to both and 1.3 and 2.6-Gbyte optical disks; it can also read 650-Mbyte disks.

  • Page 146: User Zone Layout

    Small Optical Disk Library RW546 Service Manual Figure 6–5 Optical Disk Layout User Zone Layout The User Zone consists of Defect Management Areas (DMAs), a User Area and a Slipping Area. The DMAs contain information on the organization of the User Area into User Groups and Spare Groups.
  • Page 147 Chapter 6. Theory of Operation 650-Mbyte Disk User and Spare Groups Figure 6–6 shows the User Zone Layout for 650-Mbyte disks. The values for g, m, and n are variable depending on how the disk is formatted. 1.3-Gbyte Disk User and Spare Groups Figure 6–7 and Figure 6-8 show the User Zone Layout for 1.3-Gbyte, for both g=1 (single data area and one spare area) and g=16 (16 data areas and 16 spare areas), respectively.

  • Page 148: Optical Disk Layout - 1.3 Gbyte Capacity

    Small Optical Disk Library RW546 Service Manual Figure 6–6 User Zone Layout for 650-Mbyte Media Optical Disk Layout - 1.3-Gbyte Capacity This section highlights some of the aspects of 1.3-Gbyte Capacity optical disks as outlined by ECMA 184. The disk is divided into various zones, similar to the 650-Mbyte capacity. See Figure 6–5.

  • Page 149: User Zone Layout - 1.3 Gbyte Capacity

    Chapter 6. Theory of Operation read from and write to the optical disk. Consult the ISO standard for more infor- mation. User Zone Layout - 1.3-Gbyte Capacity The User Zone consists of Defect Management Areas (DMAs), and User Area. The DMAs contain information about the organization of the User Area into User Groups and Spare Groups.
  • Page 150 Small Optical Disk Library RW546 Service Manual Figure 6–7 User Zone Layout for 1.3-Gbyte Media, g=1 6–18 EK–SOL46–SV. B01...
  • Page 151 Chapter 6. Theory of Operation Figure 6–8 User Zone Layout for 1.3-Gbyte, g=16 EK–SOL46–SV. B01 6–19...

  • Page 152: Values For N And M For 1.3-Gbyte With G=16 (1024 Media)

    Small Optical Disk Library RW546 Service Manual Table 6–1 Values for n and m for 1.3-Gbyte with g=16 (1024 media) Band Data Band 0 27064 Data Band 1 28815 Data Band 2 30498 Data Band 3 32198 Data Band 4 33898 Data Band 5 35581...
  • Page 153 Chapter 6. Theory of Operation Table 6–2 Physical Revolution to Logical Track Layout (continued) Zone or Band Physical Revolution Range Logical Track Range Data Band 8 (10800, 12149) (15600, 17999) Data Band 9 (12150, 13499) (18000, 20499) Data Band 10 (13500, 14849) (20500, 23099) Data Band 11...
  • Page 154 Small Optical Disk Library RW546 Service Manual Figure 6–9 User Zone Layout for 2.6-Gbyte, 1024 bytes/sector 6–22 EK–SOL46–SV. B01...
  • Page 155 Chapter 6. Theory of Operation Figure 6–10 User Zone Layout for 2.3-Gbyte, 512 bytes/sector EK–SOL46–SV. B01 6–23...
  • Page 156 Small Optical Disk Library RW546 Service Manual Table 6–3 4X 1,024 Bytes/Sector Disk Structure Zone# Start No. LBAs Start LBA End LBA Track Track Track 2948 2944 50048 50047 2974 5873 2900 49300 50048 99347 5899 8753 2855 48535 99348 147882 8779 11588...
  • Page 157 Chapter 6. Theory of Operation Table 6–3 4X 1,024 Bytes/Sector Disk Structure (continued) Zone# Start No. LBAs Start LBA End LBA Track Track Track 69529 71123 1595 27115 1169158 1196272 71149 72698 1550 26350 1196273 1222622 72724 74228 1505 25585 1222623 1248207 74254...
  • Page 158 Small Optical Disk Library RW546 Service Manual Table 6–4 4X 512 Bytes/Sector Disk Structure (continued) Zone# Start No. LBAs Start LBA End LBA Track Track Track 56452 58501 2050 63550 1735535 1799084 58524 60517 1994 61814 1799085 1860898 60540 62477 1938 60078 1860899...

  • Page 159: Technical Comparisons Of 1X, 2X, And 4X Optical Drives

    Chapter 6. Theory of Operation Table 6–5 Technical Comparisons of 1X, 2X, and 4X Optical Drives Item bytes per sector 1,024 (512) 1,024 (512) 1,024 (512) track pitch 1.60 1.39 1.15 spiral direction outward outward inward data encoding (2, 7) RLL (2, 7) RLL (1, 7) RLL channel bits per byte...

  • Page 160: Drive Defect Management

    Small Optical Disk Library RW546 Service Manual Drive Defect Management The RWZ53 drive supports the defect management scheme specified by ISO 10089A and ISO DIS 11560, and ECMA 184. Each DMA consists of a: • disk definition structure (DDS) • primary defect list (PDL) •...

  • Page 161: Slip Sparing Algorithm

    Chapter 6. Theory of Operation The Slipping Area is a portion of the User Zone used by the slip sparing algo- rithm. Defects found during certification are excluded from use. The user acces- sible space is slipped by a corresponding number of sectors into the slip area. This area is large enough to account for a maximum of 2048 slip spares.

  • Page 162: Replacement Sparing Algorithm

    Small Optical Disk Library RW546 Service Manual Replacement Sparing Algorithm The replacement sparing algorithm is intended to manage defective sectors found after initialization. As was mentioned earlier, the DDS allows for a number of sectors to be reserved for future use by the replacement sparing algorithm. These "spare sec-torso" re- side in the Spare Groups, and are referred to via entries in the SDL.

  • Page 163: Error Detection And Recovery

    Chapter 6. Theory of Operation Table 6–6 shows the error thresholds for the RWZ53 optical drive. The sector IDs column refers to the minimum number of sector IDs that must be read cor- rectly for the corresponding operation to be deemed successful. The ECC level column refers to the maximum number of bytes per interleave that require cor- rection in order for the corresponding operation to be deemed successful.

  • Page 164: Error Detection

    Small Optical Disk Library RW546 Service Manual Error Detection The autochanger error detection methods are extensive. Both processes and sen- sors detect errors. Each of the processes that detect errors are interrelated. Depending on the error condition, the autochanger expects feedback from one or more of the following processes before a diagnosis is made: •...

  • Page 165: Scsi Detected Errors

    Chapter 6. Theory of Operation Error Recovery Processes The autochanger uses the following processes to recover from errors: • inline recovery • find home sequence • calibrate For certain well-defined error conditions, recovery operations that have little ef- fect on position or performance of the autochanger are executed inline. These are used only if the error condition can be determined exactly, and in cases where further motion may make recovery difficult.

  • Page 166: Move Errors

    Small Optical Disk Library RW546 Service Manual In all of these cases, the command is rejected immediately and the mechanics do not move. Move Errors If an error is detected during an autochanger motion, the state of the machine is recorded in internal memory and a retry procedure is called.

  • Page 167: Hardware Error Codes

    Chapter 6. Theory of Operation Hardware Error Codes If an error is unrecoverable (i.e., something is broken or jammed to a point that manual intervention is required), the autochanger takes an additional step in an attempt to identify the Field Replaceable Unit (FRU) that is causing the failure. A routine is called automatically that performs a process of elimination for vari- ous FRUs.

  • Page 168: Diagnostic Stragety

    Small Optical Disk Library RW546 Service Manual Recovery Log This is a record of recoverable (soft) errors, and related information on error re- covery methods used and their success or failure. Drive Log This data indicates the number of times the autochanger uses the drive. Runtime Log An entry is put into this log each time an error occurs that requires any form of recovery.

  • Page 169: Single-Ended Versus Differential Scsi Interfaces

    Chapter 6. Theory of Operation CAUTION DO NOT CYCLE POWER during any trouble- shooting until you are sure the system SCSI bus is INACTIVE and will REMAIN INACTIVE. Removing power while the bus is active can cause data loss and/or indeterminate bus states. Check the host system reference manuals for information on checking the status of the SCSI bus.

  • Page 170: Group 0 Commands (6-Byte Command)

    Small Optical Disk Library RW546 Service Manual NOTE Detailed descriptions of these commands and their functionality with optical products can be found in the following documents: • American National Standards Institute (ANSI) document titled, Small Computer System Interface - 2 (SCSI-2), revision 10H which is dated Septem- ber, 1991.
  • Page 171 Chapter 6. Theory of Operation Table 6–7 Group 0 Commands (6-byte command) (continued) Code (Hex.) Name Description Reserve Gains the exclusive control of a specified logical unit Release Releases a specified logical unit from the reser- vation state Mode Sense Reads optical disk, drive unit, or controller unit parameters Start/Stop Unit...
  • Page 172 Small Optical Disk Library RW546 Service Manual Table 6–7 Group 0 Commands (6-byte command) (continued) Code (Hex.) Name Description Write Long Writes data to the specified logical block ad- dress without using the ECC generation circuitry Log Select Clears drive resident logs and odometers Log Sense Reads drive resident logs and odometers Mode Select...

  • Page 173: Reader Comments

    Errors Noted (include page, paragraph, table or figure number) __________________ Most-Liked Features: ___________________________________________________ Least-Liked Feature ____________________________________________________ Suggestions for Improvement _____________________________________________ Return Address: Name Phone Digital Equipment Corporation Customer Research Title Response Center Company 334 South Street, SHR3-2/W3 Shrewsbury, MA 01545...

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