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IBM 7015 R10 Installation And Service Manual
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IBM 7015 R10 Installation And Service Manual

IBM 7015 R10 Installation And Service Manual

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SA23-2708 -01
7015
Models R1 0, R20, and R21 CPU Drawer
Installation and Service Guide

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Summary of Contents for IBM 7015 R10

  • Page 1 SA23-2708 -01 7015 Models R1 0, R20, and R21 CPU Drawer Installation and Service Guide...
  • Page 3 7015 Models R10, R20, and R21 CPU Drawer Installation and Service Guide...
  • Page 4 You can use any functionally equivalent program instead. Documentation owner: Gary H iemke IBM is a registered trademark of International Business Machines Corporation. ©Copyright International Business Machines Corporation, 1 994. 1 995. All rights reserved Note to US Government Users- Documentation and programs related to restricted rights- Use , duplication,...

  • Page 5: Table Of Contents

    Table of Contents Communications Statements ..........
  • Page 6 Chapter 3. Removal and Replacement Procedures ......3- 1 Handling Static-Sensitive Devices ....... Acclimation 3- 1 Power-On Procedure .

  • Page 7: Communications Statements

    Communications Statements The following statement applies to this product. The statement for other products intended for use with this product appears in their accompanying manuals. Federal Communications Commission (FCC) Statement Note: This equipment has been tested and found to comply with the l imits for a Class A digital device.

  • Page 8: International Electrotechnical Commission (Iec) Statement

    International Electrotechnical Commission (IEC) Statement This product has been designed and built to comply with I EC Standard 950 European Union (EU) Statement This product is i n conformity with the protection requirements of EU Council Directive 89 /336/EEC on the approximation of the laws of the Member States relating to electromagnetic compatibility.

  • Page 9: Radio Protection For Germany

    Radio Protection for Germany Dieses Geri:i. t ist berechtigt in O bereinstimmung mit dem deutschen EMVG vom 9.Nov.92 das EG-Konformitatszeichen zu tohren. Der Aussteller der Konformitatserklarung ist die I BM Germany. Dieses Gerat erfullt die Bedingungen der EN 55022 Klasse A. Fur diese Klasse von Geraten gilt folgende Bestimmung nach dem EMVG : Gerate durfen an Orten , fur die sie nicht ausreichend entstort sind , nur mit besonderer Genehmigung des Bundesministers tor Post und Telekommunikation oder des Bundesamtes...
  • Page 10 Viii Service G u i de...

  • Page 11: Safety Notices

    Safety Notices Note: For a translation of danger and caution notices, see System Unit Safety Information, order number SA23-2652. Definitions of Safety Notices A danger notice indicates the presence of a hazard that has the potential of causi ng death or serious personal injury.
  • Page 12 Service Guide...

  • Page 13: About This Book

    About This Book How to Use This Book This book provides maintenance information that is specific to the 7015 models R 1 0, R20, CPU drawers. It also contains maintenance analysis procedures (MAPs) that are unique to these systems. MAPs that are common to all systems are contained in POWERstation and POWERserver Common Diagnostics Information Manual.
  • Page 14 Service G u i de...

  • Page 15: Chapter 1 . Reference Information

    Chapter 1 . Reference Information Note: The power supply has electric power any time the power supply cord is plugged i nto a working electrical outlet (even when the Power Off button has been pressed) S ystem Unit Features The 701 5 Models R1 0, R20, and R21 CPU Drawer standard configuration contains the following: CPU planar, planar with integrated SCSI , two serial ports, and one parallel port (the keyboard port, mouse port, and tablet port are not supported ) , standard...

  • Page 16: Rear View

    Rear View <D <D �������� LJ: % 0�0 � c=:p <D <D m�Lf o 0 o o 0 o <D Cable Connections Adapter Locations � � Remote Reset Interface Port el Port Seria I Port 2 <D 000 I(D- Seria Port 1 (Keyboard, Mouse and Tablet are not supported functions)

  • Page 17: Operator Panel

    System Unit Contents Memory Model R1 0 Cards Adapter Cards Divider Assembly Adapter Card Remote Reset Retainer Interface Card UO Fan Assembly C PU Fan Assembly O perator Panel Front Bezel Note: The power supply has electric power as long as the power supply cord is plugged i nto a working electrical outlet (even when the Off button has been pressed) Model R20 Memory...
  • Page 18 As Viewed from Bottom of CPU Drawer C PU Operator Panel Card in Operator CD-ROM cage Panel Power Sup pi Battery (not visible from bottom) 3.5-lnch Diskette Drive 1 GB Disk Drive Flex Cable 1 -4 Service Guide...

  • Page 19: Connector Locations

    Conne ctor Lo cations CPU Planar Connectors Modei R10 � J13 Power Connector J14 Power Connector J16 Power Connector J12 Interface Connector Model R20 L2 Cache Memory Card Slots J13 Power Connector J14 Power Connector J16 Power c:::=: :J c::: :J c::: :J Connector J12 Interface Connector...

  • Page 20: 1/0 Planar Connectors

    1/0 Planar Connectors J36 1 nterface Connector for CPU Planar J3 5 J39 Operator Panel Connector J38 1 ntergrated DODD SCSI Connector J40 Power Connector J41 Power J59 Disk Drive Connector Connector Standard 1/0 Flex Circuit There are no fuses in the Standard Flex circuit.

  • Page 21: Power Supply Connectors

    Power Supply Connectors Note: The power supply has electric power any time the power supply cord is plugged into a working electrical outlet (even when the Power button has been pressed) J49A J49B Connector Function planar connector planar connector J 14 planar connector J 16 planar connector...

  • Page 22: Data And Power Flow

    Data and Power Flow Model R10 AC Power CPU Planar Standard Position D (Keyboard, Mouse and Tablet Flex Circuit are not supported functions) � Data Power Note: See pages for the layouts of the CPU Planar. The data and power flow is identical for each model. Service G u i de 1 -8...

  • Page 23: Specifications

    Spe cifi cations The following section gives the specifications for the 701 5 POWERserver, models R1 R20, and R21 " Models Physical Specifications 701 5 R 1 0, R 20, R 2 1 Power Power supply output 542 watts de Thermal output Configuration dependent Power source loading...

  • Page 24: Install The Rails And Mounting Hardware For The New Cpu Drawer

    Install the Rails and Mounting Hardware for the New CPU Drawer Note: racks have E IA numbers visible from the rear that go from (at the bottom) to 32 (at the top) . The lowest EIA number completely occupied by a drawer is said to be that d rawer's EIA position.

  • Page 25: Typical Rail Installation

    Typical Rail Installation Rear of Rail ,... Front of Rail Front of Rack Mounting Hardware For CPU Drawer � Detail Rear of Rail Detail A Front of Rail � Rail Mounting Rail Lock Washer N ut Clip Guide Pins 1 - 1 1 Reference Information...

  • Page 26: Service Inspe Ction Guide

    Service Inspe ction Guide • Perform a service inspection on the system in the following instances: • System is inspected for a maintenance agreement. • Service is requested and service has not recently been performed . • An a lterations-and-attachments review is performed. •...

  • Page 27: Chapter 2. Maintenance Analysis Procedures (Maps)

    Chapter 2. Maintenance Analysis Procedures (MAPs) MAP 1520: 70 15 Models R 1 0, R20, and R2 1 Power MAP Note: This is not a start-of-call MAP. Use this Power MAP only if you have been directed here from a MAP step in the POWERstation and POWERserver Common Diagnostics Information Manual.
  • Page 28 Step 2 (from Step 1 ) 1 . Set the mode switch to the Serv1ce position . 2. Press the Power Off button. 3. Follow the procedure for placing the unit in the Service position on page 3-6. 4. Disconnect the power cable connectors from the fixed disks and CD-ROM drive. 5.
  • Page 29 Step 5 (from Step This problem can be caused by a defective fan or power supply. The power supply does not stay on if it fails to sense the rotation of the cooling fans. Press the Power Off button. 3-19, 3-18, 3-22 3-24.
  • Page 30 Step 7 (from Step 6) 1 . Press the Power Off button. 2. Record the slot numbers of the memory cards on the CPU planar. 3. Remove one memory card at a time .. Refer to the "Adapter or Memory Card" procedure on page 3-1 0.
  • Page 31 Step 10 (from Step 9) 1 . Press the Power Off button. 2. Disconnect the operator panel cable from connector J39 on the planar 3. Press the Power On button. Is the power-on light on? Go to Step 11 . Exchange the operator panel, refer to the "Operator Panel Removal"...
  • Page 32 Step 1 3 (from Step 1 1 ) 1. Press the Power Off button. 2. Connect one of the cables that was removed. 3. Be sure that the power was off at least 1 5 seconds, then press the Power On button Is the power-on light on? Go to Step 1 4.
  • Page 33 Step 16 (from Step 1 5) 1 . Press the Power Off button 2 . Reinstall the adapter without any cables connected to it. 3 . Press the Power On button. Is the power-on light on? Exchange the adapter, refer to page 3-1 0; then, go to "MAP 41 0: Repair Checkout"...
  • Page 34 Step 19 (from Step 8) 1 . Press the Power Off button. 2. Connect the power cable to any device. 3. Press the Power On button . I s the power-on light on? 410: Exchange the last device connected, then go to ''MAP Repair Checkout"...
  • Page 35 MAP 1540: 70 15 Models R 1 0, R20, and R2 1 CPU Drawer - Minimum Configuration Note: This is not a start of call MAP. You should use this MAP only if you have been d irected here from a MAP step in the POWERstation and POWERserver Common Diagnostics Information Manual.

  • Page 36: Other Conditions

    Step 1 1 . Ensure that the diagnostics and the operating system are shut down. 2. Turn the key mode switch to the Service Position. 3. Press the Power Off button . I nsert the first diagnostic diskette into the diskette drive or the diagnostic CD-ROM into the CD-ROM drive.
  • Page 37 Step 2 (from Step 1 and 1 8) Press the Power Off button. 2. Record the slot numbers of the adapters. Label and record the location of any cables attached to the adapters. Remove all the adapters from the planar or system planar. 3.
  • Page 38 Step 3 (from Step 2) One of the FRUs remaining in the system unit is defective. To test each FRU, exchange the FRUs in the following order: 1 . Operator panel. planar 3. Memory cards (Models R1 0 and R21 ) 4.
  • Page 39 Step 4 (from Step 2) No failure was detected with this configuration. If you removed L2 cache SIMMs from the system reinstall them one at a time after the last pair of memory cards is installed 1 . Press the Power Off button. 2.
  • Page 40 Step 5 (from Step 4) The failure may be caused by a defective SIMM on either of the last two memory cards installed. To isolate the failing SIMM in a pair of SIMMs, do the following: 1 . Press the Power Off button. Using a pair of operational SIMMs for the type of memory card used, install the pair of SIMMs in locations 1 and 2 on one of the suspected memory cards.
  • Page 41 Step 6 (from Step 5) One of the FRUs remaining the system unit is defective. • To test each FRU . exchange the FRUs in the following order: • Buffer SIMM in connector TCW (Models R1 0 and R2 1 ) •...
  • Page 42 Step 7 (from Steps and 4) 1 . Press the Power Off button. 2. Record the slot numbers of the adapters. Label and record the location of any cables attached to the adapters. Remove all the adapters from the planar. 3.
  • Page 43 Step 8 (from Step 7) 1 . Press the Power Off button. 2. Connect the SCSI cable (P38) to the planar. 3. Disconnect the signal and power connectors from all the SCSI devices. 4. Insert the first diagnostic diskette into the diskette drive. 5.
  • Page 44 Step 9 (from Steps 1 and 4) 1 . Press the Power Off button. 2. Record the slot numbers of the adapters. Label and record the location of any cables attached to the adapters. Remove all the adapters from the planar.
  • Page 45 Step 10 (from Step 9} Press the Power Off button. 2. Connect the signal cable for the 3.5-inch diskette drive (P59) to the planar. 3. I nsert the diagnostic CD- ROM into the CD-ROM drive. 4 Press the Power On button. •...
  • Page 46 Step 1 1 (from Steps 8 and 1 0) 1 . Press the Power Off button. Connect the signal and power connectors to one of the SCSI devices that was attached to the i ntegrated SCSI controller. 3. I nsert the first diagnostic diskette into the diskette drive or the diagnostic C D-ROM into the CD-ROM drive.
  • Page 47 Step 12 (from Step 1 1 ) 1 . Press the Power Off button. Connect the SIO data-signal cable ( P37) to the planar. 3. Insert the first diagnostic diskette into the diskette drive or the diagnostic CD-ROM into the CD-ROM drive. 4.
  • Page 48 Step 1 3 (from Steps 1 1 and 1 2) 1 . Press the Power Off button. K. T. 2. Connect the cables that were plugged into connectors S 1 , S2, P and M on the rear of the system unit. 3.
  • Page 49 Step 14 (from Step 1 3) The system is working correctly with this configuration. One of the FRUs (adapters) that you removed is probably defective. 1 . Press the Power Off button. 2 . I nstall a FRU (adapter) , and connect any cables and devices that were attached to it . 3 .
  • Page 50 Step 15 (from Step 1 4) 1 . Press the Power Off button. Starting with the devices, disconnect a device or cable connector from the last adapter installed. 3. I nsert the first d iagnostic diskette into the diskette drive or the d iagnostic CD-ROM disc into the CD-ROM drive.
  • Page 51 The last device or cable you disconnected is detective. Exchange the defective dev1ce or cable. Go to "Map 041 0: Repair Checkout" in the POWERstation and POWERserver Common Diagnostics Information Manual. Step 1 6 (from Step 1 ) 1 . Press the Power Off button. 2.
  • Page 52 Step 17 (from Step 1 6) 1 . Press the Enter key. If the terminal type has not been defined, you must use the Initialize Terminal option on the FUNCTION SELECTION menu to initialize the AIX operating system environment before you can continue with the diagnostics. This is a separate and different operation than selecting the console display.

  • Page 53: Chapter 3. Removal And Replacement Procedures

    Chapter 3. Removal and Replacement Procedures This chapter contains i nformation about powering the system on and off, and removing and replacing the field replaceable units for Models R1 0 and R20. Handling Stati c-Sensitive Devi ces Warning: Adapters and planars are sensitive to static electricity discharge. These devices are wrapped in antistatic bags, as shown in this illustration, to prevent this damage •...

  • Page 54: Power-On Procedure

    Power -On Pro cedure Your rack may have either a power distribution bus (PDB) or a power distribution unit (PDU) . The power on procedure for either very similar to the other. Rear View of Rack Power Distribution Unit 1 . Set the key mode switch to the Service position. CPU D rawer Operator Panel �...
  • Page 55 CAUTION: This product is equipped with a 3-wire power cable and plug for the user's safety. Use this power cable in conjunction with a properly grounded electrica l outlet to avoid electrical shock. 2. Plug the system-unit power cord into the electrical outlet at the rear of the system unit. 3.

  • Page 56: Operating With M Ultiple Attached Systems

    Operating wit h Multiple Atta ched Systems When you are operating a system that is attached to one or more other systems. cons1der how actions you take with your system can affect the attached systems, and how other systems can affect yours. Consult with the operator of an attached system whenever you think your operations might affect the other system.
  • Page 57 CPU Drawer Operator Panel N o rmal Sec � r e eEJ o we r Po we r Se r v 1 c e Key Mode Switch Power Off Button Note: For a translation of this notice, see the System Unit Safety Information manual .

  • Page 58: Service Position

    Servi ce Pos ition To gain access to the system unit, follow these steps: Do the steps in the "Power-Off Procedure" on page 3-4. If the shipping bracket is attached to the rear of the rack, loosen the retainer screw and swing the bracket away so that the cable management arm is free to move when the drawer is extended.

  • Page 59: Operating Position

    Operating Position To place the system unit into the operating position, follow these steps 1 . Press the lock buttons on the rails and slide the drawer into the system unit. 2. Install the four retainer screws on the front of the drawer. 3.

  • Page 60: Adapter Cable

    Adapter Ca ble Removal 1 . Do the "Power-Off Procedure" on page 3-4. 2. Record the locations of the adapter cables. 3. If needed, loosen the strain relief screws on the cable management arm , see page 3-6. 4. Loosen the screws on the cable connector at the rear of the system unit. 5 .

  • Page 61: L2 Cache Simm

    L2 Ca che S I M M The L2 Cache SIMMs are located only on the model R20 C PU planar. Removal 1 . Do steps 1 and 2 in "Service Position" on page 3-6. 2. Remove the two screws that attach the MCM air duct to the fan housing. Rear of Model R20 MCM A i r Duct Screws...

  • Page 62: Adapter Or Memory Card

    Adapte r o r Memo ry Ca rd Note: Refer to "Handling Static-Sensitive Devices" on page 3-1 before removing or installing adapters. The memory cards are pressed into the1r slots on the CPU planar. The memory card components face down. Most memory cards are configured in pairs.
  • Page 63 6. Press the tabs on the retainer with a flat-blade screwdriver, then lift the retainer out of the retainer brackets. 7. Disconnect any internal cables attached to the adapter. 8. Record the position of the adapter or memory card before removing it from the drawer. Warning: The latches on the S I MM connectors break easily.

  • Page 64: Memory S I Mm

    Memor y S I M M Removal 1 . Do the memory card removal procedure on page 3-1 0. 2 . Release the retainer tabs by pulling them away from the ends of the S I M M . 3. Rotate the S I M M away from the center of the card and pull it away fro m the socket Replacement 1 .

  • Page 65: Remote Reset Interface Card

    Remote Reset Interfa ce Card Note: Refer to "Handling Static-Sensitive Devices" on page 3-1 before removing or installing the remote reset interface card. Removal Do the "Power-Off Procedure" on page 3-4. 2. Disconnect the external cable attached to the remote reset port. 3.

  • Page 66: Divider Assembly

    Di vider Assem bly Removal 1 . Place the system unit in the service position. refer to page 3-6. 2. Remove all the retainer screws. 3. Remove the retainers, one at a time, by pressing one of the retainer tabs with a flat-blade screwdriver and lifting the retainer out of the retainer brackets.

  • Page 67: Standard 1/0 Flex Circuit

    Standard Flex Cir cuit Removal 1 . Do the "Power-Off Procedure" on page 3-4. 2. Disconnect any external cables from the rear of the standard flex circuit and adapter cards 7 and 8, see page 3-1 0. 3. Remove the mounting screws from the standard flex circuit.

  • Page 68: 1/0 And Cpu Planar Assembly

    and CPU Planar Assem bly Removal 1 . Do the steps 1 , 2, and 3 of the removal procedure for "Adapter or Memory Card" on page 3-1 0. 2 . For model R20, remove the two screws holding the air duct to the CPU fan assembly. see page 3-1 3.
  • Page 69 Ground Spring Remote Reset Interface Card and Bracket CPU Pianar (Model R 1 0) Assembly Replacement Replace in reverse order. Then, to place the system unit in the operating position, refer to page 3-7. Then , do the "Power-On Procedure" on page 3-2. Removal and Replacement P roced u res 3- 1 7...

  • Page 70: Fan Assembly

    Fan Assem bl y Removal 1 . Place the system unit in the service position, refer to page 3-6. 2 . Loosen the three screws on the outside of the chassis that attach the fan assembly to the system unit. 3.

  • Page 71: Cpu Fan Assembly

    CPU Fan Assem bly Removal 1 . Do the "Power-Off Procedure" on page 3-4. 2 . Carefully push the isolators through the sheet metal by pressing on them with a flat screwdriver. 3. If this is a model R20 , remove the screws for the air duct, see page 3-9. 4.

  • Page 72: Power Supply

    Power Supply Removal DANGER Do not attempt to open the covers of the power supply. Power su pplies are not serviceable and are to be replaced as a unit. 1 . Do the "Power-Off Procedure" on page 3-4. 2. Label and then unplug all cables attached to the power supply connectors. 3.
  • Page 73 1 4 . Pull the cable standoff from the chassis. 1 5 . While supporting the power supply, remove the two remaining mounting screws from the front of the power supply. Carefully guide the power-supply cables free of the frame, and then remove the power supply.

  • Page 74: Power Supply Fan

    Power Supply Fan Removal 1 . Follow the procedures for power supply removal on page 3-20. 2. D isconnect the fan power connector from the power supply. 3. Remove the fan and four rubber mounting blocks. 4. Carefully remove and set aside the four rubber mounting blocks for when you reassemble the fan.

  • Page 75: Disk Drives

    Dis k Dri ves Removal 1 . Place the system unit in the service position, refer to page 3-6. 2. Remove the four screws that secure the disk drive carrier and fan assembly in the system unit. 3. Pull the disk drive carrier and fan assembly out. 4.

  • Page 76: Disk Drive Fan

    D isk Drive Fan Removal 1 . Follow the procedures for the removal of the disk drive on page 3-23. 2. Note the routing of the power connector cable for the fan . Note: The tenon of the isolator extending through the sheet metal of the carrier is trimmed flush to the carrier face and will be difficult to reinsert into the carrier.

  • Page 77: Operator Panel Card

    Operator Panel Card Removal 1 . Place the system unit in the service position, refer to page 3-6. 2. Remove the four screws holding the CD-ROM carrier in place. 3. Pull the CD-ROM carrier out. 4. Label and disconnect all cables from the operator panel card. 5.

  • Page 78: Operator Panel Assembly

    Operator Panel Assem bl y Removal 1 . Place the system unit in the service position, refer to page 3-6. 2. Remove the four screws holding the CD-ROM carrier in place. 3. Pull the CD-ROM carrier out. 4. Disconnect J2, and J3 from the operator panel card . 5 Remove the left screw and loosen the top screw that secure the operator panel assembly.

  • Page 79: Three-Digit Display Card

    Three -Digit Display Card Removal 1 . Follow the removal procedure for the operator panel assembly, refer to page 3-25. 2 . Remove the three screws that hold the three-digit display card in position . 3 . Remove the three-digit display card from the assembly. Back of Operator Panel Assembly Replacement...

  • Page 80: Battery

    Batter y CAUTION : A lithium battery can cause fire, explosion, or a severe burn. Do not recharge, oooc disassemble, heat above 1 (21 2°F), solder directly to the cell, incinerate, or expose cell contents to water. Keep away from children. Replace only with the part number specified for you r system.

  • Page 81: 3.5 -Ln Ch Diskette Drive

    3.5 -ln ch Diskette Drive Removal 1 . Place the system unit in the service position, refer to page 3-6. 2. Remove the screw that holds the drive to the chassis. 3. Press the latch and slide the drive assembly out until you have access to the connector, then disconnect the cable from the drive.

  • Page 82: Cd-Rom Drive Or Media Device

    CD-ROM Drive or Media Device Note: For a translation of this notice, see System Unit Safety Information. CAUTION: A Class 3 laser is contained in the device. Do not attempt to operate the device while it is disassembled. Do not attempt to open the covers of the device, as it is not serviceable and is to be replaced as a unit.

  • Page 83: Chapter 4. Parts Information

    Chapter 4. Parts Information Parts I nformat1on...

  • Page 84: Covers And Related Parts

    Deta il 1 . Covers and Related Parts � 1 7a Service G u1de...
  • Page 85 Index Part Units Description N umber N umber 40H0480 Common assembly 41 F0663 1/0 adapter retainer OOG 1 270 Screw, M4 x 1 7 hex slot 40F9881 Memory card retainer 65G6875 Remote reset interface card 88G0247 Remote reset interface card assembly 1 1 F8844 Air deflector (Model R1 0) 88G471 7...

  • Page 86: Planars And Related Parts

    Detail 2 . Planars and Related Parts Se rvice G u ide...
  • Page 87 Index Part Units Description Number Number 22F9503 G round spring Screw, M3 x 3 hex slot 6258899 6279235 AR 1 -8 slot brackets 1 621 204 Screw, M4 x 40 pan OOG 1 269 Screw, M4 x 1 0 hex slot OOG 1 268 Screw, M4 x 7 hex slot 1 622304...
  • Page 88 Service G u ide...

  • Page 89: Index

    Index Num bers 3.5-diskette drive, 3-29 fan assembly CPU fan assembly, 3-1 9 3-digit display, 1 -1 fan assembly, 3-1 8 fan , disk drive, 3-24 flex circuit, standard 1/0 , 1 -6 acclimation, temperature, 3-1 adapter cable, 3-8 adapter card, 3-1 0 and C PU planar, 3-1 6 adapter or memory card , 3-1 0 planar, 3-1 6...
  • Page 90 memory card, 3-1 0 memory SIMM, 3-1 2 operating position, 3-7 parts listing operator panel assembly, 3-26 covers and related parts, 4-1 , 4-3 operator panel card , 3-25 planars and related parts, 4-5 power supply, 3-20 power flow. 1 -8 power supply fan, 3-22 power light, 1 -1 remote reset interface card, 3-1 3...
  • Page 92 Printed in the U .S.A. SA23-2708-01 1111111111111111111111111111111111111111111111111111111111111111111111...

This manual is also suitable for:

7015 r207015 r21