IBM 7212 102 Service Manual
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IBM 7212 102 Service Manual

IBM 7212 102 Service Manual

External storage device enclosure
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ERserver
7212 Model 102 External Storage Device Enclosure
7212 Model 102 Storage Device Enclosure
Service Guide
SY44-0084-04

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Summary of Contents for IBM 7212 102

  • Page 1 ERserver 7212 Model 102 External Storage Device Enclosure 7212 Model 102 Storage Device Enclosure Service Guide SY44-0084-04...
  • Page 3 ERserver 7212 Model 102 External Storage Device Enclosure 7212 Model 102 Storage Device Enclosure Service Guide SY44-0084-04...
  • Page 4 This edition applies only to the specified model of the device. © Copyright International Business Machines Corporation 2001, 2004. All rights reserved. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

  • Page 5: Table Of Contents

    . 19 Handling Static-Sensitive Devices . . 59 Step 13 . . 19 Manually Removing a Tape Cartridge . 59 Step 14 . . 19 Step 15 . . 20 Step 16 . . 20 © Copyright IBM Corp. 2001, 2004...
  • Page 6 Chapter 8. Servicing the DVD-RAM How To Use This Parts List . . 65 Example of Parts Listing . . 65 Drive ....61 Assembly 1: Parts Diagram . .

  • Page 7: Notices

    Web sites. The materials at those Web sites are not part of the materials for this IBM product and use of those Web sites is at your own risk.

  • Page 8: Safety And Environmental Notices

    Questions on the capabilities of non-IBM products should be addressed to the suppliers of those products. All statements regarding IBM’s future direction or intent are subject to change or withdrawal without notice, and represent goals and objectives only. This information contains examples of data and reports used in daily business operations.

  • Page 9: Caution Notices

    Components of the system, such as structural parts and circuit cards, can be recycled where recycling facilities exist. IBM does not currently collect and recycle used IBM products from customers in the United States other than those products that are involved in trade-in programs. Companies are available to disassemble, reutilize, recycle, or dispose of electronic products.

  • Page 10: Battery Return Program

    IBM at 1-800-426-4333. Please have the IBM part number that is listed on the battery available when you make your call. For information on battery disposal outside the United States, contact your local waste disposal facility.
  • Page 11 TV communications and to other electrical or electronic equipment. Such cables and connectors are available from IBM authorized dealers. IBM cannot accept responsibility for an interference caused by using other than recommended cables and connectors. Germany Only: This product is in conformity with the EN55022 Class B emission limits.

  • Page 12: Trademarks

    Trademarks The following terms are trademarks of International Business Machines Corporation in the United States, or other countries, or both: Application System/400 AS/400 e (Stylized) eServer iSeries Operating System/400 OS/400 pSeries RISC System/6000 RS/6000 Other company, product, and service names may be the trademarks or service marks of others.

  • Page 13: About This Guide

    7212 Model 102 Storage Device Enclosure Setup and Operator Guide, SA41-0054, provides information about installing and operating the 7212 Storage Enclosure. v IBM Externally Attached Devices Safety Information SA26-2004, provides translations of danger and caution notices. © Copyright IBM Corp. 2001, 2004...

  • Page 14: How To Send Your Comments

    If you have any comments about this book or any other IBM documentation, fill out the readers’ comment form at the back of this book. v If you prefer to send comments by mail, use the readers’ comment form with the address that is printed on the back.

  • Page 15: Chapter 1. General Information

    Chapter 1. General Information The 7212 Model 102 Storage Device Enclosure is an external enclosure that provides convenient storage expansion capabilities for select IBM eServer, pSeries, and RS/6000 computer systems. The 7212 Storage Enclosure is designed to mount in 1 EIA Unit (1.75″) of a standard 19-inch rack using an optional rack mount hardware feature kit, or be configured for desktop mounting.
  • Page 16 Bay B Bay B, on the right front of the 7212 Storage Enclosure (see Figure 1 on page 1), can accommodate any one of the four storage devices or a bay blank. The rear of the 7212 Storage Enclosure has the following components: Figure 2.

  • Page 17: System Requirement

    The 7212 Storage Enclosure can be secured to a rack or other stationary object using a security cable and clips that are inserted into the security clip hole 9 and then attached to a secure object. Contact your IBM marketing representative or business partner to purchase a security cable.

  • Page 18: As/400 And Iseries Systems

    CONTROLLER (FC 5702) or PCI-X TAPE/DASD CONTROLLER (FC 5705). See the order configurator information for the correct controller to be used for your host system model. For a list of supported processors and adapters, contact your IBM marketing representative or business partner. SCSI Bus Cables The following table shows the various SCSI cable feature codes that can be ordered depending on the host system adapter to which the product will be attached.
  • Page 19 Attaching a second device to the SCSI bus after the 7212 Storage enclosure is only supported when the internal SCSI cable is configured with a single SCSI bus. Note: For more detailed descriptions of these cables, contact your IBM marketing representative or business partner.
  • Page 20 Table 3 details the maximum total length external SCSI cable for each configuration supported on the 7212 Storage Enclosure connected to an RS/6000 or pSeries host. Table 3. Maximum SCSI Cable Lengths per Configuration for RS/6000 or pSeries pSeries or RS/6000 Device in Device in 7212 Bay B SCSI Bus...
  • Page 21 Table 4 details the maximum total length external SCSI cable for each configuration supported on the 7212 Storage Enclosure connected to an AS/400 or iSeries host. Table 4. Maximum SCSI Cable Lengths per Configuration for AS/400 or iSeries iSeries or AS/400 SCSI Device in 7212 Device in 7212 Bay B Bus Configuration...

  • Page 22: Specifications

    Specifications Table 5. Specifications for the 7212 Model 102 Storage Device Enclosure Physical Specifications Width 428 mm (16.85 in.) Depth 483 mm (19.0 in.) Height 44 mm (1.72 in.) Weight 8.3 kg (18.2 lb) Power Specifications 0.047 @ 120 V AC V AC 100 to 125, or 200 to 240 Hertz...

  • Page 23: Media Drive Environment And Use

    Media Drive Environment and Use IBM’s goal is to provide you with a product that you can configure and use reliably. Removable media drives require specific maintenance and environmental conditions to operate well over time. Using high quality, data grade media,...

  • Page 24: Scsi Hardware Issues

    IBM constantly works to provide the best possible products. To make certain that the drives work their very best, IBM occasionally releases changed microcode for the drives. When a microcode change is developed, IBM makes it available to you through the service organization or by electronic delivery.

  • Page 25: Chapter 2. Maintenance Analysis Procedures

    The following flowchart provides a graphic to be used as a guide to the MAP. For detailed instructions on how to perform each procedure safely and correctly, refer to the steps in this chapter. © Copyright IBM Corp. 2001, 2004...

  • Page 26: Step 1

    Flowchart of the MAPs (RS/6000 and pSeries Systems) Step 1 Step 8 Step 13 Does the Are either of the Media 7212-102 fans bad? power up? Replace media Replace and return to Step 1 fans and return to Step 1 Shut the system down and power off Step 9...

  • Page 27: Flowchart Of The Maps (As/400 And Iseries Systems)

    Flowchart of the MAPs (AS/400 and iSeries Systems) Step 1 Step 8 Step 13 Does the Are either of the Media 7212-102 fans bad? power up? Replace media Replace and return to Step 1 fans and return to Step 1 Shut the system down and power off Step 9...

  • Page 28: Step 10

    Step 1 DANGER An electrical outlet that is not correctly wired could place hazardous voltage on metal parts of the system or the products that attach to the system. It is the customer’s responsibility to ensure that the outlet is correctly wired and grounded to prevent an electrical shock.

  • Page 29: Step 13

    Step 4 This step performs a visual and physical check in an attempt top fix the problem. 1. Do a controlled system shutdown (refer to the instructions in the 7212 Model 102 Storage Device Enclosure Setup and Operator Guide). 2. Ensure that the power to the host is off. 3.

  • Page 30: Step 15

    Step 6 This step checks the power supply voltage levels as the possible source of the problem. 1. Press the power switch to turn off the power to the 7212 Storage Enclosure. 2. Unplug the 7212 Storage Enclosure from the electrical outlet. 3.

  • Page 31: Step 17

    Table 8. Status Interface Card Voltages J1 voltage J1 voltage 7212 7212 Left-side 7212 front 7212 front between between pins Right-side cooling fan panel power panel fault pins 1 and 2 3 and 4 cooling fan light light 4.8v < x < Green 5.4v 4.8v <...

  • Page 32: Step 19

    Step 10 This step performs a visual and physical check in an attempt top fix the problem. 1. Do a controlled system shutdown (refer to the instructions in the 7212 Model 102 Storage Device Enclosure Setup and Operator Guide). 2. Ensure that the power to the host is off. 3.
  • Page 33 Are the voltages good at each connector? Replace the power distribution cable (see “Removing and Replacing the Power Distribution Cable” on page 39), reassemble the enclosure, and then return to Step 1. Reattach the power cables to the devices and then go to Step 12. Step 12 This step examines the drives as the possible source of the problem.
  • Page 34 5. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 6. Visually inspect all of the internal components in the enclosure. Look for any signs of wear, damage, contamination, or excessive heat. 7. Physically check each cable connection and ensure all cables are fully seated and secured.
  • Page 35 Step 17 This step ensures that the external SCSI bus cable connection is proper. Inspect the SCSI bus cable for damage, such as bent pins or damaged wires. Ensure that the SCSI bus cable is properly connected to both the host system and to the 7212 Storage Enclosure.
  • Page 36 Step 19 You are here because the host system is an RS/6000 or pSeries host system. This step verifies that the 7212 Storage Enclosure has been properly configured to the host system. Check the configuration of the 7212 Storage Enclosure to the host system software by doing the following: 1.

  • Page 37: Step 21 (As/400 Or Iseries Only)

    Step 20 This step runs the AIX diagnostics to determine the problem or to verify a fix. 1. Press the power switch to turn on the power. 2. Press the load/unload button to eject any media currently loaded in the devices.

  • Page 38: Step 22 (As/400 Or Iseries Only)

    Step 22 (AS/400 or iSeries Only) This step verifies whether the installed devices can communicate with the AS/400 or iSeries host system. 1. At the command line on any AS/400 or iSeries menu, type strsst then press Enter. 2. At the System Service Tools (SST) screen, type 1 (Start a service tool), then press Enter.

  • Page 39: Step 24

    Cleaning the devices corrected the problem. Step 24 This step verifies that the installed devices can read from and write to the media properly. 1. At the command line on any AS/400 or iSeries menu, type vfytap then press Enter. 2.
  • Page 40 7212 Storage Device Enclosure Service Guide...

  • Page 41: Chapter 3. Removal And Replacement Procedures

    Do not install this unit in a rack where the internal rack ambient temperatures will exceed 40 degrees Celsius. © Copyright IBM Corp. 2001, 2004...

  • Page 42: Removing And Replacing The Cover

    Do not install this unit in a rack where the air flow is compromised. To ensure proper cooling, place the unit so that the cooling fan exits at the rear of the unit and the air inlet holes at the front of the unit have sufficient clearance to ensure airflow.

  • Page 43: Removing A Storage Device From The Enclosure

    8. Remove the six screws (two on each side 1 and two on the back 2 ) that secure the top cover of the enclosure to the chassis. Lift the rear of the cover and slide it back and away to remove it. Set the cover and screws aside for replacement later.
  • Page 44 RBBTV546-0 Figure 9. Removing the Mounting Clip Screws 5. Lift the two device mounting brackets (see 1 in Figure 10) upward and out of the 7212 Storage Enclosure. Set the two device mounting brackets and two mounting screws aside for use in securing a new device into the 7212 Storage Enclosure.

  • Page 45: Installing A Storage Device In The Enclosure

    Note: The new device to be installed in the 7212 Storage Enclosure may require a different SCSI address cable and audio cable than those used by the removed device. Remove the old SCSI address cable and audio cable from the 7212 Storage Enclosure as appropriate. The SCSI address cables are removed by depressing the tabs on the switch and guiding the switch cable out of the chassis.
  • Page 46 RBBTV531-0 Figure 12. Installing the Devices in the Enclosure 6. Grasp the finger tab of a device mounting bracket and place one of the M3 pan head screws 2 into the slot of the mounting bracket (see Figure 13). While holding the pan head screw in place with a screwdriver, carefully lower the mounting bracket down into the 7212 Storage Enclosure so that mounting bracket engages one of the flat head screws 1 on the side of the device.

  • Page 47: Removing And Replacing The Power Supply

    7. Recheck that the device is fully inserted into the 7212 Storage Enclosure and centered in the enclosure opening. While holding the device in position, tighten the two mounting screws (see 2 in Figure 13 on page 32). into the bottom of the 7212 Storage Enclosure.
  • Page 48 Figure 14. Removing and Replacing the Power Supply To replace the power supply, reverse the removal procedure. Make sure to: v Tilt the power supply assembly and insert the rear of the assembly first, making sure the external power connector aligns with the access hole. v Arrange the cables so that they do not interfere with the cooling fan blades or the replacement of the cover.

  • Page 49: Removing And Replacing The Cooling Fans

    Removing and Replacing the Cooling Fans To remove the cooling fan: 1. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 2. Disconnect the appropriate fan cable 1 from the status interface card. 3. Remove the two screws, lockwashers, and nuts ( 2 or 3 , as appropriate) that secure the cooling fan to the rear of the 7212 Storage Enclosure.

  • Page 50: Removing And Replacing The Power Switch Assembly

    Removing and Replacing the Power Switch Assembly Use the following steps to remove the power switch assembly: 1. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 2. Disconnect the power switch cable 1 from the power supply by pinching the retaining tabs on the sides of the connector and pulling the cable connector out of the power supply assembly.

  • Page 51: Removing And Replacing The Led Status Light Cable

    Removing and Replacing the LED Status Light Cable Use the following steps to remove the LED status light: 1. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 2. Perform the power switch assembly removal procedure. Refer to “Removing and Replacing the Power Switch Assembly”...

  • Page 52: Removing And Replacing The Status Interface Card

    Removing and Replacing the Status Interface Card Use the following steps to remove the status interface card: 1. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 2. Disconnect the fan cables, power supply cable, and LED cable from the status interface card.

  • Page 53: Removing And Replacing The Power Distribution Cable

    Removing and Replacing the Power Distribution Cable Use the following steps to remove the SCSI cable: 1. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 2. Disconnect the power cable connectors from the rear of each drive. 3.
  • Page 54 4. Attach the second SCSI cable external connector to the top SCSI slot on the rear of the enclosure chassis. Use the connector screws provided to attach the connector. 5. Guide the cable to the rear of the device installed in Bay A (See 1 in Figure 20) and connect the cable to the device.

  • Page 55: Installing A Single Scsi Bus Cable

    RBBTV555-0 Figure 21. Example of a Split SCSI bus Cable connection with One Installed Device Installing a Single SCSI Bus Cable Use the following procedure to install a single SCSI bus cable configuration in the 7212 Storage Device Enclosure: 1. Attach one external connector to the bottom SCSI slot on the rear of the enclosure chassis.

  • Page 56: Securing The Internal Scsi Cables

    RBBTV552-0 Figure 22. Example of a Single SCSI bus Cable connection with Two Installed Devices RBBTV556-0 Figure 23. Example of a Single SCSI bus Cable connection with One Installed Device Securing the Internal SCSI Cables After installing the cables, the cable clamps should be installed. The two self-adhesive connector clamps (see 1 in Figure 24 on page 43) and the three cable clamps (see 2 in Figure 24 on page 43) included with the assembly are used to secure the cable assembly to the enclosure.
  • Page 57 RBBTV559-0 Figure 24. The SCSI Cable Clamps Mount the two connector clamps on the raised, support structure on the bottom of the enclosure (see Figure 25.) Mount the three cable guide clamps in the approximate places indicated in Figure 25 so that the SCSI cables can be easily channeled through the clamp openings.

  • Page 58: Removing And Replacing The Scsi Address Cables

    Removing and Replacing the SCSI Address Cables Use the following steps to remove the SCSI address cables: 1. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 2. Disconnect the SCSI address cable connector from the rear of the drive. 3.

  • Page 59: Removing And Replacing The Audio Cable Assembly

    Removing and Replacing the Audio Cable Assembly Use the following steps to remove the audio cable: 1. Perform the cover removal procedure. Refer to “Removing and Replacing the Cover” on page 28. 2. Disconnect the audio cable connector from the rear of the drive in Bay B. 3.
  • Page 60 7212 Storage Device Enclosure Service Guide...

  • Page 61: Chapter 4. Servicing The Dds-4, 4Mm Tape Drive

    3. Disconnected the 7212 Storage Enclosure from the system, and turned the power to the 7212 Storage Enclosure on and off again several times. 4. Attempted an emergency eject of the cartridge by pressing and holding the unload button for at least five seconds. © Copyright IBM Corp. 2001, 2004...
  • Page 62 The following procedure describes how to manually remove a data cartridge from the tape drive. If this procedure is performed, replace the drive, discard the used media, and use new media. 1. Remove the drive from the 7212 Storage Enclosure (see “Removing a Storage Device from the Enclosure”...
  • Page 63 4. Remove the top lid of the drive mechanism (4 screws 3 ). 5. Insert a 1.5 mm hexagonal key or a small Phillips screwdriver into the aperture on the right side of the drive looking from rear. This gives you access to the motor worm wheel, as shown in Figure 29.
  • Page 64 7212 Storage Device Enclosure Service Guide...

  • Page 65: Chapter 5. Servicing The Dat 72, 4Mm Tape Drive

    3. Disconnected the 7212 Storage Enclosure from the system, and turned the power to the 7212 Storage Enclosure on and off again several times. 4. Attempted an emergency eject of the cartridge by pressing and holding the unload button for at least five seconds. © Copyright IBM Corp. 2001, 2004...
  • Page 66 The following procedure describes how to manually remove a data cartridge from the tape drive. If this procedure is performed, replace the drive, discard the used media, and use new media. 1. Remove the drive from the 7212 Storage Enclosure (see “Removing a Storage Device from the Enclosure”...
  • Page 67 4. Remove the top lid of the drive mechanism (4 screws 3 ). 5. Insert a 1.5 mm hexagonal key or a small Phillips screwdriver into the aperture on the right side of the drive looking from rear. This gives you access to the motor worm wheel, as shown in Figure 31.
  • Page 68 7212 Storage Device Enclosure Service Guide...

  • Page 69: Chapter 6. Servicing The Vxa Technology Tape Drive

    3. Disconnected the 7212 Storage Enclosure from the system, and turned the power to the 7212 Storage Enclosure on and off again several times. 4. Attempted an emergency eject of the cartridge by pressing and holding the unload button for at least five seconds. © Copyright IBM Corp. 2001, 2004...
  • Page 70 The following procedure describes how to manually remove a data cartridge from the tape drive. If this procedure is performed, replace the drive, discard the used media, and use new media. 1. Remove the drive from the 7212 Storage Enclosure (see “Removing a Storage Device from the Enclosure”...
  • Page 71 3. Remove the top lid of the drive mechanism by doing the following: a. Use a small screwdriver to press the top tabs 2 on each side of the drive. b. Slide the cover approximately 5mm to the rear, and then lift the cover off. 4.
  • Page 72 d. Ensure chassis tabs located on bottom edge of the metal drive chassis fit into the notches on the bottom of the bezel. e. After the bezel is installed on the drive, make sure that the front door opens and closes without resistance. If the door appears stuck when you try and open in, then the bezel is installed improperly.

  • Page 73: Chapter 7. Servicing The Slr60 Or Slr100 Tape Drive

    Attention: The procedure that follows may result in damage to your tape cartridge. If you use this procedure, you must replace the drive. If you choose to return the drive and the stuck tape to IBM for maintenance, the tape will be scrapped.
  • Page 74 3. If the tape drive is in the Locked position, the bridge C is positioned to prevent the tape cartridge from being removed. Open the tape unit door. 4. Locate the metal axle B inside the tape unit. Look towards the lower right corner.

  • Page 75: Chapter 8. Servicing The Dvd-Ram Drive

    With the drive still in its antistatic bag, touch it to the metal frame of an electrically grounded surface. v Hold the drive by the frame. Avoid touching the solder joints or pins. v Handle the drive carefully to prevent permanent damage. © Copyright IBM Corp. 2001, 2004...

  • Page 76: Manually Removing A Dvd Disc From The Drive

    Manually Removing a DVD Disc from the Drive If a power failure or a DVD-RAM drive failure prevents the DVD disc tray from ejecting, the disc can be removed manually. To manually remove the DVD disc: 1. Turn off the power to the 7212 Storage Enclosure. 2.

  • Page 77: Chapter 9. Servicing The Dvd-Rom Drive

    With the drive still in its antistatic bag, touch it to the metal frame of an electrically grounded surface. v Hold the drive by the frame. Avoid touching the solder joints or pins. v Handle the drive carefully to prevent permanent damage. © Copyright IBM Corp. 2001, 2004...

  • Page 78: Manually Removing A Dvd Disc From The Drive

    Manually Removing a DVD Disc from the Drive If a power failure or a DVD-ROM drive failure prevents the DVD disc tray from ejecting, the disc can be removed manually. To manually remove the DVD disc: 1. Turn off the power to the 7212 Storage Enclosure. 2.

  • Page 79: Chapter 10. Parts Diagram And Parts List

    Cover Asm, Rear, White For Next Higher Asm, see Assembly 1-2. vSeal, Top 5373637 vClip, Retaining 5356429 vFinger Stock Asm 1847630 vvChannel, Finger Stock 1847602 vSeal, Bottom 5373639 vCover, Rear, Without Paint vScrew, Panel 0416629 © Copyright IBM Corp. 2001, 2004...

  • Page 80: Assembly 1: Parts Diagram

    Assembly 1: Parts Diagram RBBTW526-3 7212 Storage Device Enclosure Service Guide...
  • Page 81 1 Drive blank –21 19P4017 4 Bracket, drive mount –22 19P4018 1 Label, LED –23 19P4019 1 Label, IBM logo –24 19P5078 2 Cable clamp base, rectangular C-clamp –25 19P5079 2 Cable clamp cover, rectangular C-clamp –26 59F4585 1 Toroid –00...
  • Page 82 Assembly 1: (continued) Asm– Part Index Number Units Description –00 19P0005 1 Rack slide rails –00 34L0145 2 Terminator, LVD –00 19P4754 13 Screw, M3 x 4mm low profile –00 19P4755 6 Screw, M3 x 6mm flat head –00 21F8763 1 DDS-4 cleaning cartridge –00 59H4457...

  • Page 83: Appendix A. Power Cables

    Canada, Cayman Islands, Colombia, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Guyana, Haiti, Honduras, Jamaica, Japan, Korea (South), Mexico, Netherlands Antilles, Nicaragua, Panama, Peru, Philippines, Puerto Rico, Saudi Arabia, Suriname, Taiwan, Trinidad, U.S.A. (except Chicago), Venezuela © Copyright IBM Corp. 2001, 2004...
  • Page 84 Table 9. Power Cable Information (continued) Part Number Country or Region Index 6952301 6 ft Chicago Chicago, U.S.A. 13F9940 Australia Argentina, Australia, New Zealand, Uruguay 13F9979 France Abu Dhabi, Austria, Belgium, Bulgaria, Botswana, Egypt, Finland, France, Germany, Greece, Iceland, Indonesia, Korea (South), Lebanon, Luxembourg, Macau, Netherlands, Norway, Portugal, Saudi Arabia, Spain, Sudan, Sweden, Turkey, Yugoslavia 13F9997 Denmark...

  • Page 85: Appendix B. Safety Inspection Procedures

    If unsafe conditions are present, determine how serious the hazards are and whether you should continue before correcting the problem. Figure 40 shows the components to review during the service inspection. RBBTW505-0 Figure 40. Performing the Safety Inspection © Copyright IBM Corp. 2001, 2004...
  • Page 86 Perform the following safety checks. 1. Do a controlled system shutdown. Refer to the instructions in the 7212 Model 102 Storage Device Enclosure Setup and Operator Guide. 2. Turn off the power to all external devices connected to the system unit. 3.
  • Page 87 Figure 41. Rear View of the 7212 Storage Enclosure Note: Use an analog meter to measure grounding resistance; do not use a digital multimeter. 15. If the 7212 Storage Enclosure passes the test in the previous step, plug its external power cable into the electrical outlet. If the 7212 Storage Enclosure does not pass the test, see Chapter 2, “Maintenance Analysis Procedures,”...
  • Page 88 7212 Storage Device Enclosure Service Guide...
  • Page 89 Thank you for your responses. May we contact you? h Yes h No When you send comments to IBM, you grant IBM a nonexclusive right to use or distribute your comments in any way it believes appropriate without incurring any obligation to you. Name...
  • Page 90 Readers’ Comments — We’d Like to Hear from You Cut or Fold Along Line SY44-0084-04 Fold and Tape Please do not staple Fold and Tape _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ NO POSTAGE NECESSARY IF MAILED IN THE...
  • Page 92 Part Number: 24R1295 Printed in USA SY44-0084-04...

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