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1. 9 6 9 6 Reassembling the EXB 8500 2 3 amo ES 9 7 9 7 Adjusting the Servo Read Amplitude 9 7 9 8 Testing the Replacement 9 7 10 SYS Card Cover Replacement 10 1 10 1 Required Tools RR RR RUE we HEE Ke 10 1 10 2 Removing the SYS Card Cover 10 2 10 3 Replacing the SYS Card Cover 10 3 10 4 Adjusting the Head Sync Timing 10 3 10 5 Testing the Replacement 10 3 vi 510204 11 SYS Card Replacement 11 1 11 1 Required Tools us ccm be ee a ee a 11 1 11 2 Preparing the EXB BbOO sso o Remo 11 2 11 3 Removing the Mounting Screws a 11 3 11 4 Disconnecting the SYS Card Connectors 11 4 11 5 Reconnecting the SYS Card Connectors 11 7 11 6 Reattaching the SYS Card to the Main Housing 11 7 11 7 Reassembling the EXB 8500 11 8 11 8 Loading Microcode onto a New SYS Card 11 8 11 9 Adjusting the Head Sync Timing 11 8 11 10 Testing the Replacement 11 9 12 Deck Assembly Replacement 12 1 12 1 Required TOO S qr Sales GE Ee ne eee 12 1 12 2 Preparing the EXB 8500 2 x wow E eee 12 2 12 3 Remo
2. 16 3 16 4 Removing the Erase Head Bracket and Tape Guide 16 4 16 5 Removing the Tape from the TapePath 16 6 16 6 Removing the Door and Faceplate 16 8 16 7 Winding the Loose Tape and Ejecting the Data Cartridge 16 9 16 8 Reassembling the EXB 8500 16 10 17 Adjusting the Head Sync Timing 17 1 17 1 Required Equipment wx 17 1 17 2 Using the Head Sync Tape k ERR 17 2 18 Adjusting the Servo Read Amplitude 18 1 18 1 Required Tools and Equipment 18 1 16 2 Preparing the EXB 8500 kee Bhi mk 18 2 18 3 Adjusting the Servo Read Amplitude for EXB 8200 Format 18 4 18 4 Adjusting the Servo Read Amplitude for EXB 8500 Format 18 5 19 Replacing the Boot PROM 19 1 19 1 Required Tools oom mnm Rm Rey un REOR m ee A eS 19 1 19 2 Preparing the EXB 6500 45 uo oa oe Nox m bee oe Se 19 2 19 3 Removing and Replacing the Boot PROM 19 3 Removing the Existing Boot PROM 19 3 Installing a New Boot PROM 19 4 19 4 Reassembling the EXB 8500 19 5 viii 510204 Figures Figure 3 1 Figure 4 1 Figure 5 1 Figure 5 2 Figure 5 3 Figure 6 1 Figure 6 2 Figure 8 1 Figure 8 2 Figure 9 1 Figure 9 2 Figure 9 3 Figure 9 3 Figure 10 1 Figur
3. October 1991 15 1 15 Loading New Microcode to the EXB 8500 Notes 15 2 510204 16 Removing Tape from the Tape Path 16 Removing Tape from the Tape Path This chapter describes how to remove a data cartridge and tape that is loaded in the tape path of a nonfunctioning EXB 8500 Use this procedure only as a last option when it is necessary to preserve the data on the tape Removing a data cartridge from a nonfunctioning EXB 8500 involves these steps l 2 Preparing the EXB 8500 Preparing the data cartridge taping open the data cartridge door Removing the erase head bracket Removing the tape guide Removing the tape from the tape path Removing the door and faceplate Winding the loose tape into the data cartridge and ejecting the cartridge Note Before using this procedure or if there are any questions about this procedure contact EXABYTE Technical Support Technical Support will attempt to provide alternate methods for recovering the data cartridge 16 1 Before Starting the Procedure Before starting this tape removal procedure make sure you read this section It contains important information about possible damage to the EXB 8500 data cartridge and data describes a preliminary procedure to try before performing the tape removal procedure and lists the tools required for this procedure IMPORTANT EXABYTE Corporation does not assume responsibility for any damage to the EXB 8500 the data cartridge o
4. Then straighten the pins and reinsert the R pack Follow the previous steps to remove insert and inspect the R pack Note Do not use the R pack if any of the pins are broken October 1991 3 5 3 R Pack Replacement 3 4 Testing the Replacement To test the replacement of an R pack run the EXPERT WrtVari test If the test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Refer to the EXPERT User s Guide for more information on running EXPERT tests 3 6 510204 4 Top Cover Replacement 4 Top Cover Replacement October 1991 This chapter describes how to remove and replace the top cover Compatibility of the Top Cover with the KRW Card There are two versions of the top cover m One version has a conductive gasket on its underside m The other version does not have a conductive gasket on its underside There are also two versions of the KRW card m One version has a bus bar at the top m The other version has two springs at the top Only certain combinations of these two parts are compatible Table 4 1 shows the compatiblity of the top cover with the KRW card Table 4 1 Compatibility of the Top Cover with the KRW Card This top cover Is compatible with this KRW card With bus bar With springs With k Yes if gasket is Lcd Yes removed Without gasket No Yes Before you replace the top cover ensure that the new top c
5. operation requested by an initiator The EXB 8500 is a target Underwriters Laboratories German Association of Electrotechnical Engineers Verband Deutscher Elektrotechniker Glossary Notes G 4 510204 Index A agency certification of EXB 8500 1 5 amplitude See servo read amplitude automatic head sync tape using B 17 1 17 2 bezel See faceplate boot PROM replacing bottom See SYS card cover C card retainers replacing cards handling 9 2 11 2 KRW card connector 9 4 replacing edge mounted 9 1 9 8 SYS card removal and replacement chassis See main housing cleaning cartridge 14 3 cleaning the EXB 8500 accepted products for 14 3 frequency of 14 3 14 4 instructions for 14 4 code loading from tape cover See SYS card cover See top cover D 19 1 19 6 7 1 7 4 11 1 11 10 15 1 15 2 12 1 12 4 8 1 8 6 9 1 9 8 deck assembly replacing deck hanger replacing DIF card replacing door opening manually 5 1 replacing 5 1 5 4 downloading microcode from tape E 15 1 15 2 edge mounted cards replacing 9 1 9 8 electrostatic discharge requirements 2 4 erase head bracket removing 16 4 October 1991 Index EXB 8500 agency certification of 1 5 approaches to maintaining 2 1 2 8 cleaning 14 3 14 4 list of FRUs for 1 3 removing tapes from 16 1 16 10 testing 2 4 tools for maintaining 2 1 EXPERT using to test EXB 8500 2 3 F
6. 8500 2 4 manuals for 2 3 software for 2 3 tapes for 2 3 tools for 2 3 tools for maintaining EXB 8500 2 1 for removing tape manually 16 2 top cover replacing 4 1 4 6 510204
7. Boot PROM code level 8 or higher 4 Microcode level 85C 0050 or higher To determine the levels of the boot PROM code and microcode see the label on the top of the EXB 8500 If you do not have code at the required levels you can order a free upgrade from EXABYTE IMPORTANT To ensure accurate results replace the automatic head sync tape after using it 150 times If you have problems at any time adjusting the head sync with the head sync tape get a new head sync tape October 1991 17 1 17 Adjusting the Head Sync Timing 17 2 Using t he Head Sync Tape When a head sync tape is inserted into the EXB 8500 the EXB 8500 automatically detects its presence and adjusts the head sync as required No operator intervention is needed other than inserting the tape into the EXB 8500 To se steps i Note 17 2 t the head sync timing with the automatic head sync tape follow these Apply power to the EXB 8500 and wait for it to complete its power on self test Press the unload button on the EXB 8500 and wait for the door to open Insert the head sync tape in the EXB 8500 and close the door Wait approximately one minute while the EXB 8500 loads the tape and resets the head sync timing The green and amber LEDs will flash during this time After the head sync timing has been reset the EXB 8500 automatically rewinds unloads and ejects the tape and turns both LEDs off If the EXB 8500 Monitor program is running and the hea
8. Dut and Away From Connector Socket Key Slot Press to Release 3 Pin Connector Socket Slide Plug Dut and Away from Connector Socket Key Slot Key Slot Press to Release Figure 11 3 SYS Card Connectors 4 Turn the EXB 8500 so that it is resting on its back with the front facing up 5 Pull the SYS card away from the main housing and remove all of the connectors along the front edge of the card 6 Turn the EXB 8500 again so that the bottom of the EXB 8500 is still facing you and the front faces to your right 7 Remove all of the connectors along this edge of the card 8 Once you have disconnected all the electrical connections pull the SYS card away from the main housing 11 6 510204 11 SYS Card Replacement 11 5 Reconnecting the SYS Card Connectors To reconnect the SYS card connections follow the instructions for removing the SYS card connections in reverse order as follows l Start at the rear of the EXB 8500 and work around to the front 2 Then work across the front and back toward the rear 3 End with the rear connector on the right side of the EXB 8500 4 Ensure that all connectors are fully seated CAUTION Be sure to plug the connectors into the correct sockets The connectors and the sockets are color coded or sized differently to help you determine which connector goes with which socket 11 6 Reattaching the SYS Card to the Main Housing To reattach the SYS card to the m
9. EXB 8500 Move the EXB 8500 to the maintenance area 7 1 Required Tools To replace a card retainer you need the following tools v Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v 10 TORX bit v 8 TORX bit 7 2 Preparing the EXB 8500 To access the card retainers first remove this part Top cover Chapter 4 October 1991 7 1 7 Card Retainer Replacement 7 3 Removing the Card Retainers To remove a card retainer follow this step 1 Grasp the ends of the card retainer between your thumb and first finger and lift straight up You should feel no resistance when removing a card retainer 2 Repeat step 1 for the other card retainer Figure 7 1 shows the locations of the card retainers Note that there is a left and a right card retainer Card Retainer left NX Card Retainer right agnt g Figure 7 1 Location of Card Retainers 7 2 510204 7 Card Retainer Replacement 7 4 Replacing the Card Retainers The card retainers are designed as left and right components and will fit correctly only one way To replace the card retainers follow these steps Place each card retainer so that only one card is in a slot the deck hanger fits in the slot farthest away from the screw hole and the screw hole is lined up with the hole on the tab at the rear of the EXB 8500 If the cards are aligned squarely in the EXB 8500 the card retainers will slide on with little or no f
10. Eight bits or one character The small plastic pieces that sit on top of the installed printed circuit cards and the deck hanger These pieces keep the cards and the deck hanger from touching each other The EXB 8500 contains a left and a right card retainer Centimeter 0 3937 inches Canadian Standards Association The portion of the EXB 8500 that contains the drum assembly data cartridge loader and tape path The plastic and copper piece that separates the printed circuit card section from the deck section of the EXB 8500 The printed circuit card that controls the differential interface SCSI operations of the EXB 8500 See also SIF card The portion of the deck assembly that contains the EXB 8500 s five heads two write heads two read heads and servo head Also called the head assembly The three cards DIF SIF KCD and KRW that are mounted on edge into the SYS card Electrically erasable programmable read only memory Erasable programmable read only memory G 1 Glossary G 2 EXB 8500 FCC faceplate FRU GByte head sync host ID IEC initiator KByte KCD card kg KRW card MByte mm ms or msec NSTA SCSI SCSI ID The EXB 8500 8mm Cartridge Tape Subsystem The EXB 8500 can store up to 5 0 gigabytes of data on a single 8mm data cartridge Federal Communications Commission The portion of the front of the EXB 8500 that frames the door Field replaceable unit
11. Figure 16 3 EXB 8500 with Tape Loaded Tape Guide and Erase Head Bracket Removed October 1991 5 Remove the tape from around the guide posts and rollers at points 3 and 4 shown in Figure 16 3 Be sure to place the tool inside the tape loop to avoid touching the tape recording surface or the head assembly 16 7 16 Removing Tape from the Tape Path 6 Position the tool between points 4 and 5 inside the tape loop Point 5 shown in Figure 16 3 is an L shaped molded black plastic part The L is mounted upside down and prevents the tape from riding up over the rotating drum Gently move the tape up so that it passes between the L and the edge of the head assembly Note Be careful that the tape is not creased or damaged in any way when removing it from this point 7 Lift the tape from around the guide posts and roller at point 6 shown in Figure 16 3 Be sure to place the tool inside the tape loop 16 6 Removing the Door and Faceplate IMPORTANT When opening the door as described in Chapter 5 hold the door so that it opens more slowly than normal This will prevent the data cartridge from being moved quickly and damaging the tape The door and faceplate must be removed to allow access to the data cartridge To remove the door and faceplate follow these steps 1 Remove the door by following the instructions in Chapter 5 2 Remove the faceplate by following the instructions in Chapter 6 3 Once the
12. Lift the SYS card cover off of the main housing 2 2 c X 290 SYS Card V ponheod taptite Cover screw Use 8 TORX bit 6 places Figure 10 1 SYS Card Cover Screws EXB 8500 Shown Upside Down 10 2 510204 10 SYS Card Cover Replacement 10 3 Replacing the SYS Card Cover To replace the SYS card cover follow these steps 1 Position the SYS card cover so that the tabs are down and the stamped part number is on the end closest to the faceplate Make sure that all six of the mounting pads are in contact with the SYS card and that the holes are lined up with the corresponding holes in the SYS card 2 Setthe SYS card cover in place on the main housing and start the six screws that were removed previously Do not tighten the screws yet 3 As needed move the cover slightly to align all of the mounting holes CAUTION Do not overtighten the screws Overtightening these screws can damage the SYS card or strip the holes in the main housing If any of the screw holes in the main housing become stripped replace the main housing 4 When all of the mounting holes are aligned use a T 8 TORX bit to tighten the mounting screws to 3 4 inch pounds 3 9 kg cm of torque 10 4 Adjusting the Head Sync Timing After you replace the SYS card cover you must adjust the head sync timing using the EXABYTE automatic head sync tape for the EXB 8500 For instructions on using this tape see Chapter 17 10 5 Testing the
13. P 2 3 2 3 Static Protection Requirements 2 4 2 4 Recommended Approaches to Maintenance 2 4 Test the EXB 8500 before Replacing Parts 2 4 Replace Paris 22d moo m bomo 2 5 Test the EXB 8500 After Replacing Parts 2 6 3 R Pack Replacement 3 3 3 1 Required Tools at ee m xps RC genis fae an 3 3 3 2 Removing an R PaCk dx Ex EE 3 4 3 3 Installing an R Pack xoci aCe GY 3 5 3 4 Testing the Replacement 3 6 4 Top Cover Replacement 4 1 4 1 Required Tools a acu uc hoe Die em cem E CE oes 4 2 42 Removing the Top Cover 24264 sa e4 4 3 4 3 Replacing the Top Cover 4 4 4 4 Testing the Replacement 4 5 5 Door Replacement 2 ee ee RE Rn 5 1 5 1 Required Tools 6 uS meu maid RR Ow Hos ose RS ER 5 1 5 2 Removing the Door bye we ee ee ee es 5 1 5 3 Replacing the Door mo Se mee Wei wae 5 3 October 1991 Vv 6 Faceplate Replacement 6 1 6 1 Required Tools ue uiro we RC 6 1 6 2 Removing the Faceplate 6 2 6 3 R
14. Replacement To test the replacement of the SYS card cover perform these steps 1 Run the EXPERT WrtVari or Short test 2 Run the EXPERT Motion test If either EXPERT test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Referto the EXPERT User s Guide for more information on running EXPERT tests October 1991 10 3 10 SYS Card Cover Replacement Notes 10 4 510204 11 SYS Card Replacement 11 SYS Card Replacement This chapter describes how to remove and replace the SYS card WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 11 1 Required Tools October 1991 To replace the SYS card you need the following tools 4 Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm T 10 TORX bit T 8 TORX bit Tweezers 1 flat blade screwdriver Floppy diskette containing microcode files EXABYTE automatic head sync tape for the EXB 8500 part number 180025 11 SYS Card Replacement 11 2 Preparing the EXB 8500 The SYS card is mounted on th
15. To remove the KRW card s ribbon cable follow these steps Remove the deck hanger to allow access to the ribbon cable connector on the KRW card see Chapter 8 2 Use a flat tool such as the blade of a flat blade screwdriver to slide the ribbon cable connector open to the right Once the connector is open carefully pull out the cable 3 Remove the KRW card as described in Section 9 3 9 4 510204 October 1991 9 Edge Mounted Card Replacement Compatibility of the KRW Card with the Top Cover There are two versions of the KRW card m One version shown in Figure 9 2 has bus bar at the top m The other version shown in Figure 9 3 has two springs at the top Figure 9 2 KRW Card with Bus Bar Figure 9 3 KRW Card with Springs 9 5 9 Edge Mounted Card Replacement There are also two versions of the top cover m One version has a conductive gasket on its underside m The other version does not have a conductive gasket on its underside Table 9 1 shows the compatibility of the KRW card with the top cover Table 9 1 Compatibility of the KRW Card with the Top Cover This top cover Is compatible with this KRW card With bus bar With springs With gasket Yes if gasket is yas removed Without gasket No Yes Before you replace the KRW card ensure that the new KRW card is compatible with your top cover If you have a KRW card with springs remove the gasket
16. faceplate replacing 6 1 6 4 firewall See deck hanger firmware loading from tape 15 1 15 2 frame See main housing front bezel See faceplate H hanger See deck hanger head sync timing equipment for adjusting 17 1 procedure for adjusting 17 1 17 2 housing replacing 13 1 13 4 K KCD card replacing 9 1 9 8 KRW card connectionson 9 4 location of ground points 18 3 location of head sync test pointon 18 2 location of servo test pointon 18 2 replacing 9 1 9 8 M main housing replacing 13 1 13 4 maintenance approaches to 2 1 2 8 preliminary procedures 2 5 static protection requirements for 2 4 test software for 2 3 test tapes for 2 3 testing after 2 6 testing before 2 4 tools required for 2 1 microcode loading from tape 15 1 15 2 Index P preliminary maintenance procedures 2 5 PROM boot PROM replacing 19 1 19 6 R R packs replacing 3 3 3 6 read amplitude See servo read amplitude S safety standards met by EXB 8500 1 5 servo read amplitude adjusting 18 1 18 8 tools required to adjust 18 1 SIF card replacing 9 1 9 8 software required for testing 2 3 static protection requirements 2 4 SYS card cover replacing 10 1 10 4 SYS card replacing 11 1 11 10 T tape guide removing 16 4 tapes for testing EXB 8500 2 3 removing from EXB 8500 manually 16 1 16 10 testing after FRU replacement 2 6 before FRU replacement 2 4 EXB
17. from your top cover before reassembling the EXB 8500 9 5 Replacing an Edge Mounted Card 9 6 To replace an edge mounted card follow these steps 1 Align the edge connector with the edge connector socket The positions of the edge connectors on the SYS card are keyed only one type of card fits into a particular socket Ensure that the component side of the card is facing the rear of the EXB 8500 Note Make sure that the components of the KRW card face the front of the EXB 8500 Press on both ends of the card at the same time until the card is properly seated in the card edge connector on the SYS card Insert the ribbon cable into its connector on the KRW card Once the cable is fully inserted close the connector by sliding it to the left If you have just installed a KRW card with springs remove the gasket from your top cover before reassembling the EXB 8500 510204 9 Edge Mounted Card Replacement 9 6 Reassembling the EXB 8500 To reassemble the EXB 8500 replace these parts in the following order Deck hanger Chapter 8 Card retainers Chapter 7 Top cover Chapter 4 9 7 Adjusting the Servo Read Amplitude If you have replaced the KRW card you must also adjust the servo read amplitude See Chapter 18 for instructions 9 8 Testing the Replacement October 1991 To test the replacement of an edge mounted card run the EXPERT WrtVari test If the test fails check the EXPERT trace log for causes and to he
18. hanger perform the following steps 1 Apply power to the EXB 8500 Make sure the power on self test completes normally 2 Load a data cartridge into the EXB 8500 Perform another power on cycle and make sure it completes normally 3 Run the EXPERT WrtVari test If the test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Refer to the EXPERT User s Guide for more information on running EXPERT tests October 1991 8 5 8 Deck Hanger Replacement Notes 8 6 510204 9 Edge Mounted Card Replacement 9 Edge Mounted Card Replacement This chapter describes how to remove and replace the edge mounted cards These cards consist of the following m clocking and detection card m KRW read write card m SIF or DIF single ended or differential interface card Notes m If you are replacing the KRW card you must also adjust the servo read amplitude as described in Chapter 18 m There are two versions of the KRW card and two versions of the top cover Only certain combinations of these two parts are compatible See Section 9 4 for details WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect t
19. provides general information about the EXB 8500 including information about using this manual related publications and the EXB 8500 s compliance with regulatory and safety agency standards m Chapter 2 contains information about the tools and materials you need to test and maintain the EXB 8500 and describes recommended approaches to testing and maintaining the EXB 8500 Part 2 Replacing Field Replaceable Units Chapters 3 through 13 provide step by step instructions for removing and replacing EXB 8500 field replaceable units FRUs These chapters also recommend tests to perform after a part has been replaced to ensure that it was replaced correctly Instructions for replacing the following FRUs are included R packs terminators Top cover Door Faceplate Card retainer Deck hanger Edge mounted cards DIF SIF KCD and KRW cards SYS card cover bottom cover SYS card Deck assembly Main housing 1 3 1 General Information Part 3 Performing Other Maintenance Procedures Chapters 14 through 17 contain additional maintenance procedures that should be performed as needed The following information is included Chapter 14 contains instructions for cleaning the EXB 8500 Chapter 15 provides a brief discussion on loading new firmware to the EXB 8500 Chapter 16 contains instructions for removing tape from the tape path of a nonfunctioning EXB 8500 Chapter 17 contains instructions for using the automatic head sync tap
20. remove the KRW card s ribbon cable as explained in Section 9 4 on page 9 4 1 Grasp the card between your thumb and first finger on both ends of the card 2 Rock the card from left to right to release it from the edge connector socket This will require a reasonable amount of force since the card fits securely into the socket 3 Lift the card straight up and out of the EXB 8500 SIF or DIF Cara KRW Card Connector r SYS Card Figure 9 1 Edge Connector Mounted Cards October 1991 9 3 9 Edge Mounted Card Replacement 9 4 Replacing the KRW Card When removing the KRW card be aware of the following m Unlike the other edge connector mounted cards the KRW card has a ribbon cable connected to it that you must detach before removing the card m There are two versions of the KRW card one of which is incompatible with the version of the top cover that does not have a conductive gasket on its underside m When youreplace the KRW card you must also adjust the servo read amplitude See Chapter 18 for instructions This section describes how to detach the KRW card s ribbon cable and the compatibility of the KRW card with the top cover Adjusting the servo read amplitude is described in Chapter 18 Detaching the KRW Card s Ribbon Cable The KRW card shown in Figure 9 1 on page 9 3 has a ribbon cable connected to it and is the only card with the major components facing the front of the EXB 8500
21. the system integrator UL Standard 1950 1st Edition Information Technology Equipment UL Standard 478 4th Edition Electronic Data Processing Units and Systems CSA Standard certified C22 2 No 220 M1986 Information Processing and Business Equipment CAN CSA Standard C22 2 No 950 M89 Safety of Information Technology Equipment pending IEC 950 EN60950 Safety of Information Technology Equipment including Electrical Business Equipment TUV When integrated into a final product the EXB 8500 is designed to meet the requirements of the following agencies FCC Rules Part 15 Class B Computing Devices Canadian Department of Communications Radio Interference Regulation Digital Apparatus Class B VDE Vfg 1046 1984 Class B CISPR Publication 22 1985 Class A 1 5 1 General Information 1 3 Other Test Standards When shipped the EXB 8500 is packaged in a manner that complies with the testing criteria defined by National Safe Transit Association NSTA Project 1 1 6 510204 2 Approaches to Maintaining the EXB 8500 2 Approaches to Maintaining the EXB 8500 This chapter lists the tools and equipment required for testing and maintaining the EXB 8500 and describes the recommended approaches to maintaining the EXB 8500 2 1 Required Tools and Equipment Refer to Table 2 1 on page 2 2 to determine the tools you need to perform the procedures described in this manual Also a list of the tools needed for a procedure
22. update tape part number 180026 m Using the EXB 8500 Monitor program m Using the WRITE BUFFER 3Bh SCSI command This chapter contains guidelines to help you decide which is the most appropriate method for updating your code 15 1 Deciding Which Loading Method to Use The loading method that you use to update your code depends on the state of the EXB 8500 s existing code Follow these guidelines to determine which method is most appropriate for you m If you replace SYS card you must use the EXB 8500 Monitor program m If you are updating code on an existing SYS card use either the microcode update tape or the WRITE BUFFER command Note If you want to use the microcode update tape to update your code the existing code must be at level 85C 0040 or above To determine the level of the existing code see the label on the top of the EXB 8500 Or if the code has been updated previously issue an INQUIRY 12h command to the EXB 8500 refer to the EXB 5500 Smm Cartridge Tape Subsystem User s Manual 15 2 Where to Find Code Loading Information For information about the different methods for loading code refer to the manuals listed in the following table For information about the Refer to this manual Microcode update tape EXB 8500 8mm Cartridge Tape WRITE BUFFER command Subsystem User s Manual Monitor User s Guide for the EXB 8500 Monitor program EXB 8500 8mm Cartridge Tape Subsystem
23. 0 x 250 84 80 x 250 panhead plostite screw Use T 10 TORX bit 2 places panhead plastite screw Use T 10 bit Top Cover 00 17 07 m d H2 56 x 250 Q lt 2 panhead toptite screw 2 Use T 8 TORX bit d 2 places Figure 4 1 Location of Top Cover Screws October 1991 4 3 4 Top Cover Replacement 4 3 Replacing the Top Cover Note Before replacing the top cover make sure it is compatible with your KRW card If your KRW card has two springs at the top remove the gasket on your top cover before reassembling the EXB 8500 See Chapter 9 for more information To replace the top cover follow these steps 1 Holding the rear of the cover up slightly position the cover with the flat tabs toward the front of the EXB 8500 and the two downward bent tabs toward the rear of the EXB 8500 2 Slide the cover toward the front of the EXB 8500 so that the flat tabs are inserted into the corresponding slots on the faceplate 3 Lower the rear of the cover so that the tabs line up with the screw holes in the card retainers You may need to apply slight pressure to seat the top cover properly CAUTION Do not overtighten the screws Overtightening these screws can strip the holes in the main housing the card retainers or the deck hanger If any of the screw holes in the main housing become stripped replace the main housing 4 Secure the rear of the cover through the card retainers a
24. 1 6 Faceplate Replacement 6 2 Removing the Faceplate To remove the faceplate follow these steps 1 To avoid damaging tape ensure that there 15 no data cartridge in the EXB 8500 2 Open the door by using a small nonconductive tool such as a potentiometer adjustment tool to move the door release lever toward the front of the EXB 8500 Figure 6 1 shows the location of the door release lever Note The amount of force required to activate the door release lever is slight and the lever should move no more than one eighth of an inch Be careful not to damage the small switch contacts next to the lever S L Wes LOS e lc d S uad P d P VS Pd P d bw L S 7 LO S D Pd n L B E d Lo Door Release Lever d Figure 6 1 Location of Door Release Lever Side View of EXB 8500 3 Remove the EXB 8500 s door as described in Chapter 5 4 Close the door bracket 5 Using a T 8 TORX bit loosen but do not remove the four faceplate mounting screws Figure 6 2 shows the location of these screws 6 2 510204 Faceplate 6 Faceplate Replacement 2 36 x 250 panhead taptite screw Use 1 8 RX bit C4 places Figure 6 2 Location of Faceplate Screws October 1991 6 Position the EXB 8500 so that it is resting on the rear of the main housing with the door facing up 7 Move the faceplate away from the main housing 6 3 6 Faceplate R
25. E 8mm data cartridge or equivalent Oscilloscope Potentiometer adjustment tool 18 1 18 Adjusting the Servo Read Amplitude 18 2 Preparing the EXB 8500 To prepare the EXB 8500 for adjusting the servo read amplitude follow these steps 1 Connect the EXB 8500 whose amplitude needs adjusting to the power source and to the SCSI bus of your personal computer 2 Connect the oscilloscope to the power source and turn it on 3 Insert one of the oscilloscope probes through the EXB 8500 s top cover and connect it to the servo test point labeled SV near the left edge of the KRW card Figure 18 1 shows the location of the servo test point 4 Insert the other oscilloscope probe through the EXB 8500 s top cover and connect it to the head sync test point labeled HSYN near the right edge of the KRW card Figure 18 1 shows the location of the head sync test point Figure 18 1 Location of Test Points on KRW Card 18 2 510204 October 1991 18 Adjusting the Servo Read Amplitude 5 Connect any two of the four ground terminals from the oscilloscope to the ground points springs on the KRW card Attach one ground terminal to each ground point Figure 18 2 shows the locations of the ground points You are now ready to adjust the servo read amplitude for both EXB 8200 and EXB 8500 formats 04 Figure 18 2 Location of Ground Points on the KRW Card 18 3 18 Adjusting the Servo Read Amplitude 18 3 Adjusting the Se
26. EXB 8500 8mm Cartridge Tape Subsystem Maintenance zExabyte 510204 001 Copyright Copyright 1991 by EXABYTE Corporation All rights reserved This item and the information contained herein are the property of Corporation No part of this document may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without the express written permission of EXABYTE Corporation 1685 38th Street Boulder Colorado 80301 Disclaimer EXABYTE Corporation makes no representation or warranties with respect to the contents of this document and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose Further EXABYTE Corporation reserves the right to revise this publication without obligation to notify any person or organization of such revision or changes Trademark Notices EXABYTE is a registered trademark and EXATAPE is a trademark of EXABYTE Corporation Pull A PLCC is a trademark of Emulation Technology Inc TORX is a registered trademark of Camcar Division of Textron Inc Revision History for 510204 Previous revisions of this manual include the following Revision Date 000 August 1991 initial release For information about the changes and enhancements to this revision refer to page iv 510204 Prod
27. EXB 8500 Monitor program to load the new code from these files onto your SYS card For more information about using the Monitor program refer to the Monitor User s Guide for the EXB 8500 8mm Cartridge Tape Subsystem 11 9 Adjusting the Head Sync Timing After you have replaced the SYS card and loaded the microcode you must adjust the head sync timing using the EXABYTE automatic head sync tape for the EXB 8500 For instructions on using this tape see Chapter 17 11 8 510204 11 SYS Card Replacement 11 10 Testing the Replacement To test the replacement of the SYS card do the following Run the EXPERT Inter chg test 2 Run the EXPERT WrtVari test 3 Run the EXPERT Motion test If any EXPERT test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Refer to the EXPERT User s Guide for more information on running EXPERT tests October 1991 11 9 11 SYS Card Replacement Notes 11 10 510204 12 Deck Assembly Replacement 12 Deck Assembly Replacement This chapter describes how to remove and replace the deck assembly The deck assembly contains the data cartridge loader the tape path mechanism and the head assembly WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload
28. GBytes of data transfer whichever occurs first For planning purposes approximately 1 GByte of data is transferred per hour of operation in EXB 8200 mode October 1991 14 3 14 Cleaning the EXB 8500 To use the cleaning cartridge follow these steps 1 Apply power to the EXB 8500 When the power on self test is complete press the unload button and remove any data cartridge in the EXB 8500 Leave the door open 2 Place the cleaning cartridge in the EXB 8500 and close the door The EXB 8500 automatically performs the remainder of the cleaning cycle When the cleaning cycle is complete the cleaning cartridge is unloaded and ejected from the EXB 8500 The average cleaning cycle is 15 seconds 3 On the cleaning cartridge label record the date you performed the cleaning 4 Store the cleaning cartridge for future use Note Ifthe cleaning cartridge is ejected from the EXB 8500 without performing a cleaning cycle that is before 15 seconds the cleaning cartridge has reached the end of its useful life and should be discarded CAUTION To prevent contamination of the EXB 8500 do not use the cleaning cartridge for more than the number of cleaning cycles specified on the cartridge label 14 4 510204 15 Loading New Microcode to the EXB 8500 15 Loading New Microcode to the EXB 8500 When a new firmware release becomes available you can download the microcode to the EXB 8500 in one of three ways m Using a microcode
29. Gigabyte or one billion bytes The adjustment that ensures that the drum assembly is rotating at the correct speed Proper head sync adjustment provides for write read interchangeability between different EXB 8500s and EXB 8200s The computer system that acts as the initiator of an operation Identification International Electrotechnical Commission A host computer system that requests an operation to be performed by a target Kilobyte or 1 024 bytes The printed circuit card that controls the clocking and detection operations of the EXB 8500 Kilogram 2 2 pounds The printed circuit card that controls the read and write operations of the EXB 8500 Megabyte or one million bytes Millimeter 0 03937 inches Millisecond National Safe Transit Association Small Computer System Interface A unique identifier assigned to each device or subsystem on the SCSI bus Also referred to as the address 510204 October 1991 SIF card SYS card SYS card cover target UL VDE Glossary The printed circuit card that controls the single ended interface SCSI operations of the EXB 8500 See also DIF card The main printed circuit card or motherboard at the bottom of the EXB 8500 This card controls servo operations as well as the operations of the other printed circuit cards in the EXB 8500 The bottom cover of the EXB 8500 that fits over the SYS card A bus device usually a controller that performs an
30. Maintaining the EXB 8500 Notes 2 8 510204 Part 2 Replacing Field Replaceable Units 3 R Pack Replacement 3 R Pack Replacement This chapter describes how to remove and replace the resistor terminators R packs on the back of the EXB 8500 The single ended version of the EXB 8500 SIF card uses two internal R packs with the following characteristics 10 pin 9 resistor Single in line package SIP Socket mounted 110 ohms The differential version of the EXB 8500 DIF card does not use internal R packs WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 3 1 Required Tools To replace an R pack you need the following tool v Hlat nose pliers October 1991 3 3 3 R Pack Replacement 3 2 Removing an R Pack To remove an R pack follow these steps 1 Locate the two R packs on the back of the EXB 8500 Figure 3 1 shows the locations of these R packs labeled RP1 and RP2 2 Using a pair of flat nose pliers grasp either one of the R packs in the center Be careful not to squeeze the pliers too tightly or you m
31. Read Amplitude 4 Once the amplitude is adjusted disconnect the oscilloscope from the KRW card and eject the data cartridge October 1991 18 7 18 Adjusting the Servo Read Amplitude Notes 18 8 510204 19 Replacing the Boot PROM 19 Replacing the Boot PROM This chapter describes how to remove and replace the boot PROM on the EXB 8500 s SYS card WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 19 1 Required Tools To replace the boot PROM you need the following tools Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v 10 TORX bit v T 8 TORX bit 4 PROM removal tool such as Emulation Technology s Pull A PLCC October 1991 19 1 19 Replacing the Boot PROM 19 2 Preparing the EXB 8500 To access the boot PROM first remove these parts in the following order Top cover Chapter 4 Card retainers Chapter 7 KCD card Chapter 9 SIF or DIF card Chapter 9 Note You do not need to remove the KRW card which is the card closest to the front of the EXB 8500 IMPORTANT When removing or i
32. ain housing follow these steps 1 Turn the EXB 8500 upside down with the front of the EXB 8500 facing you 2 Setthe SYS card in place and start the two screws that attach the SYS card to the main housing Do not tighten these screws yet 3 Carefully inspect the edges of the SYS card to ensure that no wires are caught between the SYS card and the main housing CAUTION Do not overtighten the screws Overtightening these screws can damage the SYS card or strip the holes in the main housing If any of the screw holes in the main housing become stripped replace the main housing 4 Using a T 8 TORX bit tighten the two screws to 3 4 inch pounds 3 9 kg cm of torque October 1991 11 7 11 SYS Card Replacement 11 7 Reassembling the EXB 8500 To reassemble the EXB 8500 replace these parts in the following order SYS card cover Chapter 10 KRW card Chapter 9 KCD card Chapter 9 SIF DIF card Chapter 9 Deck hanger Chapter 8 Card retainers Chapter 7 Top cover Chapter 4 11 8 Loading Microcode onto a New SYS Card After replacing the SYS card with a new SYS card you must load the required microcode onto the new SYS card EPROMs With the replacement SYS card you should have received a 54 inch floppy diskette This diskette contains two binary files with the following types of names 85C xxxx BIN Control and servo code where xxxx is the code level 85E xxxx BIN Customer specific code where xxxx is the code level Use the
33. ard cover deck or main housing you must also use the automatic head sync tape from EXABYTE to adjust the head sync timing see Chapter 17 m When you replace the KRW card you must also adjust the servo read amplitude see Chapter 18 Table 2 2 on page 2 7 lists the tests and procedures that you should perform after replacing the indicated part For more details about the tests or procedures and the results you should expect refer to the chapter for the part you are replacing 510204 2 Approaches to Maintaining the EXB 8500 Table 2 2 Tests and Procedures to Perform after Replacing FRUs October 1991 Field Replaceable Tests or Procedures to Discussed in Unit FRU Perform after Replacement Card retainer EXPERT WrtVari Chapter 7 EXPERT WrtVari Deck assembly EXPERT Motion Chapter 12 Head sync Deck hanger EXPERT WrtVari Chapter 8 DIF SIF card EXPERT WrtVari Chapter 9 Door none Chapter 5 Faceplate none Chapter 6 KCD card EXPERT WrtVari Chapter 9 EXPERT WrtVari KRW card Servo read amplitude Chapter 9 adjustment EXPERT WrtVari Main housing EXPERT Motion Chapter 13 Head sync R Pack EXPERT WrtVari Chapter 3 EXPERT WrtVari or Short pied EXPERT Motion Chapter 10 Head sync EXPERT WrtVari EXPERT Motion SYS card Update microcode Chapter 11 Head sync Top cover EXPERT WrtVari Chapter 4 New microcode EXPERT WrtVari Chapter 15 2 Approaches to
34. ard the rear of the EXB 8500 This pulls the tape off of the takeup reel and makes a loose loop in the tape Using your finger move the pinch roller flange toward the left side of the EXB 8500 and hold it in this position This releases the pinch roller from the capstan and provides a gap between the pinch roller and the pinch roller flange CAUTION After starting to remove the tape do not release the pinch roller until the tape is completely removed from around the pinch roller and capstan If the pinch roller is released before the tape is clear of these components the tape will be damaged 510204 Point Es Pinch Roller Flange Pinch Roller Point 4 Paint 2 Point A Le 16 Removing Tape from the Tape Path around the pinch roller and capstan release the pinch roller flange Insert the tool in the tape loop at point 2 and gently lift the tape up from After the tape is completely clear of the pinch roller and the capstan m I jt ad oint Zo aa 1 9 a UL f 2 N p di uy W D AWS e a 77 Yay 9 o W NO 9x9 5 N LRT Wu SPP aa RS Y p m ll OA B AT S 3 lt C p di oF LONE GE 3 Point E 6 B
35. ath WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 8 Deck Hanger Replacement 8 1 Required Tools To replace the deck hanger you need the following tools V V v Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm T 10 TORX bit T 8 TORX bit 1 flat blade screwdriver 8 2 Preparing the EXB 8500 To access the deck hanger first remove these parts in the following order Top cover Chapter 4 Card retainers Chapter 7 8 2 510204 8 Deck Hanger Replacement 8 3 Removing the Deck Hanger To remove the deck hanger follow these steps 1 Locate the locking tabs that hold the deck hanger in place as shown in Figure 8 1 The locking tabs protrude through the deck hanger from the rear of the EXB 8500 2 Using a 1 flat blade screwdriver press one of the tabs toward the rear of the EXB 8500 while pulling up on the same end of the deck hanger Hold that end of the deck hanger in the unlocked position until you release the other tab Then remove the deck hanger from the EXB 8500 Left Car
36. ay break the R pack 3 Pull the R pack straight out SCSI Terminator R Packs RP1 RP2 Figure 3 1 Location of R Packs Back View of EXB 8500 3 4 510204 3 R Pack Replacement 3 3 Installing an R Pack CAUTION If you replace the R packs be sure to use the correct size and type of terminators Otherwise damage to the EXB 8500 can occur The EXB 8500 uses two 10 pin 9 resistor SIP terminators of 110 ohms Replacement R packs are available from EXABYTE part number 002228 In addition when replacing an R pack make sure that pin 1 of the terminator is aligned with pin 1 of the socket and that no pins are bent To install an R pack follow these steps 1 Orient the R pack so that pin 1 is toward the SCSI connector on the SIF card Pin 1 has the wide line over the pin 2 Carefully position the R pack on the socket Check to ensure that each pin on the R pack 15 aligned with a hole in the socket 3 Press the R pack into the socket Be careful to provide even pressure on the outer edge of the R pack so that all pins are inserted at the same time Uneven pressure can result in the R pack being only partially inserted or in bent pins on the R pack 4 Inspect the R pack to ensure that all of the pins have been correctly inserted If the R pack is not fully seated in the socket apply additional pressure to make sure that all pins have been fully inserted 5 If any of the pins are bent remove the R pack
37. button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 12 1 Required Tools To replace the deck assembly you need the following tools v 10 TORX bit v T 8 TORX bit 1 flat blade screwdriver V 1 Phillips screwdriver Pointed non conductive tool such as a potentiometer adjustment tool Z EXABYTE automatic head sync tape for the EXB 8500 part number 180025 October 1991 12 1 Chapter 7 Chapter 8 Chapter 5 Chapter 6 Chapter 9 Chapter 9 Chapter 10 Chapter 11 Chapter 4 mount the deck to the main housing as shown in Figure 12 1 Using a 1 Phillips screwdriver remove the four Phillips screws that the main housing 2 Carefully push the deck out the front of the EXB 8500 and away from To replace the deck first remove these parts in the following order To remove the deck follow these steps Card retainers Deck hanger SYS card cover SYS card 12 2 Preparing the EXB 8500 Top cover Door Faceplate KRW card SIF DIF card 12 3 Removing the Deck 12 Deck Assembly Replacement CU AAA NN N A NS WY POX y AN SSS NN y SIA o BN y N 510204 k Mounting Dec Location of Deck Screws Figure 12 1 12 2 12 Deck Assembly Replacement 12 4 Replacing the Deck To replace the deck follow these steps 1 Careful
38. d sync timing adjustment was successful the following message is displayed a Head sync set successfully Remove the head sync tape from the EXB 8500 and store it for future use If an error occurs during the head sync timing adjustment the EXB 8500 will not eject the tape and both LEDs will flash Press the unload button to remove the tape and repeat the procedure with a new tape 510204 18 Adjusting the Servo Read Amplitude 18 Adjusting the Servo Read Amplitude When you replace the KRW card you must adjust the servo read amplitude Two potentiometers on the KRW card control the servo read amplitude IMPORTANT This procedure needs to be performed only on EXB 8500s whose main housing is black This procedure cannot be performed correctly on EXB 8500s with main housings of any other color Adjusting the servo read amplitude for the EXB 8500 involves the following steps Connecting the EXB 8500 whose amplitude needs adjusting to an oscilloscope Using EXPERT to write a 50 MByte file to tape Adjusting the potentiometers on the KRW card to the correct servo read amplitude You must adjust one potentiometer for EXB 8200 format and another potentiometer for EXB 8500 format 18 1 Required Tools and Equipment To adjust the servo read amplitude you need the following 4 October 1991 EXPERT software version 6 50 or later and equipment required to run EXPERT refer to the EXPERT User s Guide Blank EXATAP
39. e 11 1 Figure 11 2 Figure 11 3 Figure 12 1 Figure 13 1 Figure 16 1 Figure 16 2 Figure 16 3 Figure 18 1 Figure 18 2 Figure 18 3 Figure 18 4 Figure 18 5 Figure 19 1 Figure 19 2 October 1991 Location of R Packs Back View of EXB 8500 Location of Top Cover Screws cnn Location of Door Release Lever Side View of 8500 Separating the Door Parts Front View of EXB 8500 Position of Door Door Retainer and Door Bracket Location of Door Release Lever Side View of EXB 8500 Location of Faceplate Screws Hanger iu pos a Bee EOE aee OE Correct Position of Deck Hanger s Copper Shield Edge Connector Mounted Cards KRW Gard with BIS Bar a ck eon de ie HH bk ERE CER KRW Card with Springs uu noh XR ER a Compatibility of the KRW Card with the Cover SYS Card Cover Screws EXB 8500 Shown Upside Down SYS Screws len SYS Card Connectors len SYS Card llle Location of Deck Screws Removing the Main Housing rns Taping Open the Data Cartridge Door Location of Screw for Erase Head Bracket EXB 8500 with Tape Loaded Tape Guide and Erase Head Bracket Rem
40. e Section 12 3 but you do not need to remove the deck 13 3 Removing the Main Housing After separating the main housing from all other assemblies and components you can remove it To remove the main housing follow these steps 1 Grasp the main housing by the sides toward the front 2 Spread the sides of the main housing apart 3 Push the main housing away from the rest of the EXB 8500 until it is completely separate from the deck and cards as shown in Figure 13 1 Figure 13 1 Removing the Main Housing 13 2 510204 13 Main Housing Replacement 13 4 Replacing the Main Housing To replace the main housing follow these steps 1 Grasp the main housing by the sides at the front 2 Spread the sides of the main housing apart 3 Pull the main housing around the deck and cards until it is in place 4 Inspect the mounting tabs for the SYS card cover to ensure that they are positioned so that the SYS card and SYS card cover can be properly mounted to the main housing The screws for the SYS card cover should go through the SYS card cover and SYS card before they go into the main housing 13 5 Reassembling the EXB 8500 To reassemble the EXB 8500 replace these parts in the following order SYS card cover Chapter 10 Card retainers Chapter 7 Faceplate Chapter 6 Door Chapter 5 Top cover Chapter 4 13 6 Adjusting the Head Sync Timing After you replace the main housing you must adjust the head sync timing using the EXABYTE au
41. e bottom of the EXB 8500 and is the card into which the other cards KRW KCD and SIF or DIF are inserted The SYS card performs the functions of a mother board and contains all of the control circuitry Before removing the SYS card remove these parts in the following order Top cover Chapter 4 Card retainers Chapter 7 Deck hanger Chapter 8 SIF DIF card Chapter 9 KCD card Chapter 9 KRW card Chapter 9 SYS card cover Chapter 10 IMPORTANT When removing or inserting a card hold the card on the edges To avoid damaging the card do not hold the components or connectors mounted on the card After removing the card hold and place it on its edges whenever possible 11 2 510204 11 SYS Card Replacement 11 3 Removing the Mounting Screws Using a T 8 TORX bit remove the two screws that mount the SYS card to the main housing Figure 11 1 shows the locations of the screws Once these screws are removed the SYS card will be loose and the connectors can be removed To remove the connectors follow the instructions in Section 11 4 2 55 x 250 panhead taptite screw e Use 1 8 TORX bit T 2 places SYS Card Figure 11 1 SYS Card Screws October 1991 11 3 11 SYS Card Replacement 11 4 Disconnecting the SYS Card Connectors CAUTION Do not pull on the wires to remove the connectors or you may damage the wires To disconnect the SYS card connectors follow thes
42. e steps 1 Turn the EXB 8500 so that it is resting on its side with the bottom facing toward you and the front facing to your left 2 Pull the SYS card away from the main housing so that you can access the connectors There are 14 connectors and cables on the SYS card which are attached to various components on the deck Figure 11 2 on the next page shows the location of these connectors on the SYS card 11 4 510204 11 SYS Card Replacement Power Connector SIF DIF Card Connector A KCD Card Conn Connector Socket KRW Card Conn Connector Socket 5 P K Connector Connector Socket Socket F1 ra XC Connector Socket Eu a Connector Socket Figure 11 2 SYS Card Connectors 3 Starting with the connector closest to the rear of the EXB 8500 remove all of the connectors along the edge facing you Note October 1991 Use a pair of tweezers or similar tool to push down on the bottom of the key portion of the connector plug then push the plug away from the SYS card connector socket Each connector socket has either one or two key slots see Figure 11 3 On those connector plugs with two keys push alternately on each key so that the connector is removed evenly from the socket 11 5 11 SYS Card Replacement Slide Plug Out ond Away from Connector Socket Key Slot Press to Release 2 Pin Connector Socket Slide Plug
43. e tape into the cartridge Overwinding will damage the tape When all of the loose tape has been wound into the data cartridge remove the screwdriver Remove the adhesive tape that is holding open the door of the data cartridge 16 9 16 Removing Tape from the Tape Path 7 Carefully close the door on the data cartridge checking to ensure that the door does not contact the exposed tape Then remove the data cartridge 8 Replace the tape guide Ensure that it fits onto all three guide posts starting with the primary post 9 Replace the erase head bracket attaching it with the screw that you removed earlier Tighten the screw to 5 0 inch pounds 5 8 kg cm of torque 16 8 Reassembling the EXB 8500 To reassemble the EXB 8500 replace these parts in the following order Faceplate Chapter 6 Door Chapter 5 Deck hanger Chapter 8 Top cover Chapter 4 16 10 510204 17 Adjusting the Head Sync Timing 17 Adjusting the Head Sync Timing This chapter describes how to use the EXABYTE automatic head sync tape to adjust the head sync timing on the EXB 8500 The head sync adjustment is performed automatically when the automatic head sync tape is loaded into the EXB 8500 Use the automatic head sync tape whenever you replace a SYS card or a deck 17 1 Required Equipment To adjust the head sync timing using the automatic head sync tape you need the following v Automatic head sync tape for the EXB 8500 part number 180025 4
44. e to adjust the head sync timing for the EXB 8500 Chapter 18 contains instructions for adjusting the servo read amplitude for the EXB 8500 for both 8200 and 8500 read modes Chapter 19 contains instructions for replacing the boot PROM located on the EXB 8500 s SYS card A glossary index and reader s comment form are included at the back of this manual Intended Audience This manual is provided to assist EXABYTE self maintenance contract customers in the testing and maintenance of the EXB 8500 IMPORTANT The procedures in this manual must be performed by a qualified service technician whose organization has a self maintenance agreement with EXABYTE Corporation If these steps are performed by a non qualified individual the product warranty will be voided 510204 1 General Information Related Publications The following manuals and user s guides will help you understand some of the tasks referred to in this manual EXB 8500 68mm Cartridge Tape Subsystem User s Manual 510201 8500 8mm Cartridge Tape Subsystem Product Specification 510200 EXPERT User s Guide 510010 Monitor User s Guide for the EXB 8500 8mm Cartridge Tape Subsystem 510206 1 2 Regulatory and Safety Agency Standards October 1991 When purchased from EXABYTE Corporation the EXB 8500 is certified as a component by the following domestic and international product safety standards Certification of the final product is the responsibility of
45. emoved from their antistatic bags Connect this wrist band to the static protection mat or to other suitable ESD grounding Q Keep all cards in antistatic bags when not in use 2 4 Recommended Approaches to Maintenance For best results when maintaining the EXB 8500 EXABYTE recommends the following approaches Test the EXB 8500 before Replacing Parts When a problem arises with the EXB 8500 test the EXB 8500 before performing any maintenance procedures to determine the problem and possible solutions Follow these testing guidelines m Use the test equipment listed in Section 2 2 to perform these tests m Make sure the test environment meets the static protection requirements listed in Section 2 3 2 4 510204 2 Approaches to Maintaining the EXB 8500 Use a known good power supply for each EXB 8500 under test to verify operation and to eliminate any outside influences on the test Verify that all power to the test area is clean and free of feedback or inductive spikes Power problems will typically cause a high percentage of rewrites or error correction code ECC or extreme difficulty getting known good EXB 8500s to pass the tests consistently To ensure accuracy and consistency when testing a string of EXB 8500s start all EXB 8500s at the same time and run them without interruption to completion Doing this reduces the likelihood of operator error and computer software hangs Replace Parts Once you have determined which part
46. eplacement 6 3 Replacing the Faceplate To replace the faceplate follow these steps 1 2 Position the EXB 8500 so that it 15 resting on the rear of the main housing with the door facing up With the door bracket closed slide the faceplate around the door frame and align it with the four mounting screws see Figure 6 2 Position the faceplate so that the mounting tabs are under the four mounting screws and the faceplate is flush with the door when the door is closed CAUTION Do not overtighten the screws Overtightening the mounting screws can damage the faceplate mounting tabs or strip the screw holes in the main housing If any of the screw holes in the main housing become stripped replace the main housing 4 2 6 4 Using the T 8 TORX bit tighten the mounting screws to 3 4 inch pounds 3 9 kg cm of torque Replace the door and door retainer as described in Chapter 5 510204 7 Card Retainer Replacement 7 Card Retainer Replacement This chapter describes how to remove and replace the card retainers WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the
47. eplacing the Faceplate 6 4 7 Card Retainer Replacement 7 1 1 Required Tools zx Rx ae OS 7 1 7 2 Preparing the EXB 8500 ssc ae 7 1 7 3 Removing the Card Retainers 7 2 7 4 Replacing the Card Retainers 7 3 7 5 Reassemblingthe EXB 8500 7 3 7 6 Testing the Replacement ll rn 7 3 8 Deck Hanger Replacement 8 1 amp I Beguegd TBOIS sos s ses aos EO E Up XC lec oA 8 2 8 2 Preparing the EXB 8500 scs bee ee Oe es 8 2 8 3 Removing the DeckHanger 8 3 8 4 Replacing the Deck Hanger 8 4 8 5 Reassemblingthe 8500 8 5 8 6 Testing the Replacement 8 5 9 Edge Mounted Card Replacement 9 1 9 1 Required Tools UE Re 9 2 9 2 Preparing the EXB 8500 Se 9 2 9 3 Removing an Edge Mounted Card 9 3 9 4 Replacing the KRW 9 4 Detaching the KRW Card s Ribbon Cable 9 4 Compatibility of the KRW Card with the Cover 9 5 9 5 Replacing an Edge Mounted
48. es to allow the erase head bracket to be removed Position the erase head bracket so that it is hanging over the side of the EXB 8500 and away from the tape path Gently lift the tape guide straight up at the primary mounting post so that it is removed from all three posts at the same time Setthe tape guide aside so that you can replace it later 16 5 16 Removing Tape from the Tape Path 16 5 Removing the Tape from the Tape Path 16 6 CAUTION EXABYTE considers this procedure to have a high potential for damage to the tape and the heads on the EXB 8500 Use extreme caution when attempting to remove the tape using this procedure Determining Which Side of the Tape to Touch When removing the tape from the guide posts and rollers use a nonconductive tool such as a molded potentiometer adjustment tool Avoid touching the side of the tape where data is recorded If you are unsure of which side of the tape to touch with the tool carefully inspect the tape path before starting this procedure The side of the tape that comes in direct contact with the head assembly 15 the side where data 15 recorded The data side of the tape is duller in color than the back of the tape Removing the Tape To remove the tape from the tape path follow these steps l Using the nonconductive tool loosen the tape at point 1 shown in Figure 16 3 by positioning the tool between the tape and the rotating head and moving the tool tow
49. eze the door and door retainer together using your thumb and first finger of each hand so that the bottom notches snap together with the locking tabs Apply the pressure so that the door retainer moves in and up under the locking tabs It might be easier to secure one notch at a time 5 Squeeze the door and door retainer together at the top edge to engage the top locking tabs 6 Inspect the door to make sure all tabs are in the correct position If one of the bottom tabs is not in its correct position separate the door and the door retainer and restart the replacement procedure 5 4 510204 6 Faceplate Replacement 6 Faceplate Replacement This chapter describes how to remove and replace the faceplate WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 6 1 Required Tools To replace the faceplate you need the following tools v Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v T 8 TORX bit v 1 flat blade screwdriver Pointed non conductive tool such as a potentiometer adjustment tool October 1991 6
50. faceplate is removed leave the door frame open to allow access to the data cartridge 16 8 510204 16 Removing Tape from the Tape Path 16 7 Winding the Loose Tape and Ejecting the Data Cartridge With the door and faceplate removed and the door frame open you can rewind the tape To wind the loose tape and eject the data cartridge follow these steps l October 1991 Position the EXB 8500 so that it is resting on the left side of the main housing with the door facing to your left Insert the 1 flat blade screwdriver between the bottom edge of the door and the edge of the EXB 8500 Insert the blade of the screwdriver into the hub of the takeup reel the top hub with the EXB 8500 in the current position Slowly turn the screwdriver counterclockwise to wind any loose tape onto the data cartridge Note As you are rewinding the tape manually you may hear a ratcheting sound This sound is normal and does not indicate that the tape is being damaged While turning the screwdriver watch the tape loop to ensure that it does not get caught on any of the components If the tape gets caught free it and continue turning the screwdriver CAUTION Make sure that all of the loose tape in the tape loop has been wound into the data cartridge If all of the tape is not wound in the data cartridge the tape will be damaged by the cartridge door In addition once the loose tape has been wound onto the takeup reel do not overwind th
51. he power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area October 1991 9 1 9 Edge Mounted Card Replacement 9 1 Required Tools To replace edge mounted cards you need the following tools v Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v T 10 TORX bit v T 8 TORX bit 1 flat blade screwdriver To replace the KRW card you need the following tools in addition to those listed above Y Known good EXB 8500 Y EXPERT software Y Blank EXATAPE 4 Oscilloscope Potentiometer adjustment tool 9 2 Preparing the EXB 8500 9 2 The edge connector socket mounted cards plug into the SYS card To access these cards first remove these parts in the following order Top cover Chapter 4 Card retainers Chapter 7 Deck hanger Chapter 8 Note The deck hanger needs to be removed only to replace the KRW card The deck hanger does not need to be removed to access any other card IMPORTANT When removing or inserting a card hold the card on the edges To avoid damaging the card do not hold the components or connectors mounted on the card After removing the card hold and place it on its edges whenever possible 510204 9 Edge Mounted Card Replacement 9 3 Removing an Edge Mounted Card Figure 9 1 shows the position of each edge mounted card To remove any of these cards follow these steps Note Before removing the KRW card
52. ide for more information on running EXPERT tests 12 4 510204 13 Main Housing Replacement 13 Main Housing Replacement This chapter describes how to remove and replace the main housing WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 13 1 Required Tools To replace the main housing you need the following tools Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v 10 TORX bit v T 8 TORX bit v 1 flat blade screwdriver Pointed non conductive tool such as a potentiometer adjustment tool Z EXABYTE automatic head sync tape for the EXB 8500 part number 180025 October 1991 13 1 13 Main Housing Replacement 13 2 Preparing the EXB 8500 To replace the main housing first remove these parts in the following order Top cover Chapter 4 Card retainers Chapter 7 Door Chapter 5 Faceplate Chapter 6 SYS card cover Chapter 10 See Note below Note You must remove the SYS card mounting screws see Section 11 3 but the SYS card can remain in place You should also remove the deck mounting screws se
53. ing tools v 1 flat blade screwdriver v Pointed non conductive tool such as a potentiometer adjustment tool 5 2 Removing the Door To remove the door follow these steps 1 Open the door by using a small nonconductive tool such as a potentiometer adjustment tool to move the door release lever toward the front of the EXB 8500 Figure 5 1 shows the location of the door release lever The amount of force required to activate the door release lever is slight and the lever should move no more than one eighth of an inch Be careful not to damage the small switch contacts next to the lever October 1991 5 1 5 Door Replacement y F i Door Release Lever Figure 5 1 Location of Door Release Lever Side View of EXB 8500 2 Using a flat blade screwdriver separate the door from the door retainer The locking tabs that hold the two together are near the top edge of the door Figure 5 2 shows where to position the screwdriver to separate the door and the door retainer Start with either side of the door and position the screwdriver so that the prying force will separate the two components Apply the force so that it pushes the door retainer tab toward the outside edge of the door as well as away from the door Unlatch the remaining locking tab using the same method described in step 2 Separate the two components so that the bottom locking tabs are also released and both parts can be removed and set aside Fig
54. instructions in the EXB 8500 8mm Cartridge Tape Subsystem User s Manual If problems with the EXB 8500 occur contact your maintenance organization do not void the product warranty by allowing untrained or unauthorized personnel to attempt repairs October 1991 Changes and Enhancements to This Manual This revision of EXB 8500 8mm Cartridge Tape Subsystem Maintenance includes the following changes and enhancements Updated Chapters 4 and 9 to describe different versions of the KRW card and top cover Added Chapter 18 to describe how to adjust the servo read amplitude for the newer version of the KRW card Updated regulatory and safety agency standards Updated torque values in all chapters whose instructions involve removing and replacing screws 510204 Contents 1 General Information et 1 3 1 1 About This uuu EUR ERR ee 1 3 Intended Audience eee sn 1 4 Related Publications x RR gee ee RRR ee 1 5 1 2 Regulatory and Safety Agency Standards 1 5 1 3 Other Test Standards eee v oe eS 1 6 2 Approaches to Maintaining the EXB 8500 2 1 2 1 Required Tools Equipment 2 1 2 2 Required Test Equipment 2 3 Test Software sco Roa Se wee B Ves 2 3 West Tae
55. is provided in the chapter for the procedure Note In Table 2 1 the term T bit indicates a specific size of TORX driver bit for a torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm October 1991 2 1 2 Approaches to Maintaining the EXB 8500 Table 2 1 Tools Needed for EXB 8500 Maintenance Procedures To replace You will need the following tools this part or perform this RENS procedure O 2 S Eo Ta o o o T QS o E gt 52 Q o E 9 9 91 9 29 8 as Si se S 28 E WO wol 7 o BE 2 832359 9 rto lrz e s a l N zlasav9 s5 8 SE 2 92 m 58 58 5 2 ae Bla Le lt S ag Boot PROM Viv V Card retainer Viv Cleaning V Deck assembly Vivi viv Deck hanger Viv viv Door viv Faceplate V Vv Head sync v KCD card Viv KRW card Viv Vv P4 V Main housing Vv viv V V Microcode V R pack 4 SIF or DIF card Vv SYS card V vi Vv v V SYS card cover Tape SS ae E A removal Top cover Vv Such as Emulation Technology s Pull A PLCC P Or an EXABYTE manufactured 8mm cleaning cartridge EXABYTE automatic head sync tape for the EXB 8500 part number 180025 Q Depending on your requirements you can load new mic
56. ket 3 Place both of your thumbs on top of the PROM and gently press it into the socket Be careful to provide even pressure on the top of the PROM so that all pins are inserted at the same time Uneven pressure can result in the PROM being only partially inserted and in bent pins on the PROM 19 4 510204 19 Replacing the Boot PROM 4 Visually inspect the PROM to ensure that all of the pins have been correctly inserted If the PROM is not fully seated in the socket apply additional pressure to ensure that all pins on the PROM are completely inserted 5 If any of the pins are bent remove the PROM straighten the pins and reattempt the procedure Note If the pins are badly bent or broken do not use the PROM Begin the procedure with a new PROM 19 4 Reassembling the EXB 8500 To reassemble the EXB 8500 replace these parts in the following order SIF or DIF card Chapter 9 KCD card Chapter 9 Card retainers Chapter 7 Top cover Chapter 4 October 1991 19 5 19 Replacing the Boot PROM Notes 19 6 510204 Glossary October 1991 um us or usec address bus devices byte card retainers cm CSA deck deck hanger DIF card drum assembly edge mounted cards EEPROM EPROM Glossary Micrometer 0 00003937 inches Microsecond A unique identifier assigned to each device or subsystem on the SCSI bus Also referred to as the SCSI ID Initiator or target devices connected to the SCSI bus
57. llow these steps 1 October 1991 If you have not already done so start EXPERT and load the blank data cartridge into the EXB 8500 Using the EXPERT Short test in EXB 8500 format write a 50 MByte file to tape Once the write operation is complete rewind the data cartridge After you have set up the EXB 8500 and oscilloscope as described in Section 18 2 set the oscilloscope to the following Volts division 200 millivolts Time division 2 milliseconds B delay to the falling edge of head sync 100 usec Figure 18 4 shows the oscilloscope reading with no delay during a Short read operation 18 5 18 Adjusting the Servo Read Amplitude 0 80 DX Figure 18 4 Oscilloscope Reading with No Delay 8500 format 5 Locate the potentiometer labeled R37 at the top of the KRW card near the right edge 6 While reading the 50 MByte EXB 8500 format file using the EXPERT Short test use the potentiometer adjustment tool to adjust the R37 potentiometer so that the amplitude for the servo zones displayed on the oscilloscope is 800 millivolts 50 millivolts Note Turn the potentiometer clockwise to raise the amplitude and counterclockwise to lower the amplitude Figure 18 5 shows the oscilloscope reading for the proper adjustment 18 6 510204 18 Adjusting the Servo Read Amplitude Servo Zones 0 80v N Head Sync Figure 18 5 Oscilloscope Reading for EXB 8500 Format Servo
58. lp determine the appropriate action to take Note Referto the EXPERT User s Guide for more information on running EXPERT tests 9 7 9 Edge Mounted Card Replacement Notes 9 8 510204 10 SYS Card Cover Replacement 10 SYS Card Cover Replacement This chapter describes how to remove and replace the SYS card cover This cover also serves as the bottom cover of the EXB 8500 WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 10 1 Required Tools To replace the SYS card cover you need the following tools Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v T 8 TORX bit 4 EXABYTE automatic head sync tape for the EXB 8500 part number 180025 October 1991 10 1 10 SYS Card Cover Replacement 10 2 Removing the SYS Card Cover To remove the SYS card cover follow these steps 1 Turn the EXB 8500 upside down so that the SYS card cover is facing up 2 Use a T 8 TORX bit to remove the six screws that hold the SYS card cover to the main housing Figure 10 1 shows the locations of these screws 3
59. ly slide the new deck in place and start the four mounting screws to hold the deck in place while you are reassembling the EXB 8500 Do not tighten these screws yet 2 Install the faceplate from the old deck on the new deck see Chapter 6 3 Mount the door assembly from the old deck on the new deck see Chapter 5 CAUTION Do not overtighten the screws Overtightening the deck screws can strip the holes in the deck If any of the screw holes in the deck become stripped replace the deck 4 Tighten the deck mounting screws until they are snug 12 5 Reassembling the EXB 8500 To reassemble the EXB 8500 replace these parts in the following order SYS card Chapter 11 SYS card cover Chapter 10 SIF DIF card Chapter 9 KCD card Chapter 9 KRW card Chapter 9 Deck hanger Chapter 8 Card retainers Chapter 7 Top cover Chapter 4 12 6 Adjusting the Head Sync Timing After you replace a deck assembly you must adjust the head sync timing using the EXABYTE automatic head sync tape for the EXB 8500 For instructions on using this tape see Chapter 17 October 1991 12 3 12 Deck Assembly Replacement 12 7 Testing the Replacement To test the replacement of the deck do the following Run the EXPERT Inter chg test 2 Run the EXPERT WrtVari test 3 Run the EXPERT Motion test If any EXPERT test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Refer to the EXPERT User s Gu
60. nd through the center of the top cover to the deck hanger using the three larger screws use the T 10 bit Refer to Figure 4 1 for the locations of these screws Tighten the screws to 5 0 inch pounds 5 8 kg cm of torque 5 Secure the top of the cover at the left and right edges using the two smaller screws T 8 Refer to Figure 4 1 for the locations of these screws Tighten the screws to 3 4 inch pounds 3 9 kg cm of torque 4 4 510204 4 Top Cover Replacement 4 4 Testing the Replacement To test the replacement of the top cover run the EXPERT WrtVari test If the test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Refer to the EXPERT User s Guide for more information on running EXPERT tests October 1991 4 5 4 Top Cover Replacement Notes 4 6 510204 5 Door Replacement 5 Door Replacement This chapter describes how to remove and replace the door WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 5 1 Required Tools To replace the door you need the follow
61. nserting a card hold the card on the edges To avoid damaging the card do not hold the components or connectors mounted on the card After removing the card hold and place it on its edges whenever possible 19 2 510204 19 Replacing the Boot PROM 19 3 Removing and Replacing the Boot PROM After removing the edge mounted cards you can replace the boot PROM The boot PROM is the socket mounted chip in the right rear corner of the SYS card or motherboard Removing the Existing Boot PROM To remove the existing boot PROM follow these steps 1 Locate the boot PROM in the right rear corner of the SYS card see Figure 19 1 2 Using the PROM removal tool carefully extract the PROM from the card and set it aside Figure 19 1 Location of Boot PROM on the SYS Card October 1991 19 3 19 Replacing the Boot PROM Installing a New Boot PROM To install the new boot PROM follow these steps 1 Locate the notch on the corner of the PROM as shown in Figure 19 2 C vd PROM rU 1 Insert PROM Label Side Up Figure 19 2 Location of Notch in Boot PROM 2 Using your thumb and forefinger insert the PROM into the socket on the SYS card Ensure that the notch on the corner of the PROM is aligned with the notch on the socket and that the label side of the PROM faces up This ensures that pin 1 of the PROM is aligned with pin 1 on the soc
62. o y Retainer Right Cano Deck Hanger Retainer Locking Tab afi 2 places upport Arm R 2 places a Re M 5 L2 RONI 2 pu Es 2 e 7 c ie Saw il WA d LG SW Ves X N V SEM Figure 8 1 Deck Hanger October 1991 8 3 8 Deck Hanger Replacement 8 4 Replacing the Deck Hanger To replace the deck hanger follow these steps 1 From the front of the EXB 8500 position the copper shield so that the left side of it is to the left of the black tab that protrudes from the tape load mechanism Make sure that the right side of the copper shield does not interfere with the tape path mechanism or wires in the deck See Figure 8 2 Copper Shield Black Tab Make sure wires are Figure 8 2 Correct Position of Deck Hanger s Copper Shield 2 Line up the plastic portion of the deck hanger with the locking tabs behind it and the support arms in front of it The locking tabs and support arms work together to hold the deck hanger firmly in place 3 While making sure that the copper shield is still in place slide the deck hanger down between the locking tabs and support arms until it snaps into place Use very slight pressure 8 4 510204 8 Deck Hanger Replacement 8 5 Reassembling the EXB 8500 To reassemble the EXB 8500 replace these parts in the following order Card retainers Chapter 7 Top cover Chapter 4 8 6 Testing the Replacement To test the replacement of a deck
63. or parts FRUs need to be replaced follow the appropriate instructions in Chapters 3 through 13 to replace the part Before you start perform the following preliminary maintenance procedures 1 October 1991 Make sure the current operation has completed and that tape motion has stopped If necessary unload the tape by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Note Ifa data cartridge is loaded in a nonfunctioning EXB 8500 refer to Chapter 16 for instructions on removing the data cartridge If necessary remove the EXB 8500 from its enclosure or mounting brackets Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Make sure the maintenance environment meets the static protection requirements listed in Section 2 3 2 5 2 Approaches to Maintaining the EXB 8500 2 6 Test the EXB 8500 After Replacing Parts For each part FRU you replace follow the instructions for testing the replacement These tests involve running EXPERT tests and using the test tapes listed on page 2 3 Notes m When you replace the SYS card you must also update the microcode on the new SYS card Chapter 15 provides a brief description of the steps involved in updating the code on the SYS card For more detailed instructions on updating code refer to the Monitor User s Guide for the 8500 6mm Cartridge Tape Subsystem m When you replace the SYS card SYS c
64. orce 2 Adjust the card and deck hanger positions to get them into their slots in the retainer 3 After both card retainers are in place exert downward pressure on the top of both card retainers simultaneously This will ensure that all cards are properly seated in the EXB 8500 7 5 Reassembling the EXB 8500 To reassemble the EXB 8500 replace the top cover as described in Chapter 4 7 6 Testing the Replacement To test the replacement of the card retainer run the EXPERT WrtVari test If the test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Refer to the EXPERT User s Guide for more information on running EXPERT tests October 1991 7 3 7 Card Retainer Replacement Notes 7 4 510204 8 Deck Hanger Replacement 8 Deck Hanger Replacement October 1991 This chapter describes how to remove and replace the deck hanger which separates the card section of the EXB 8500 from the deck section The deck hanger has two functions m The plastic portion of the deck hanger prevents the KRW ribbon cable from interfering with the moving parts of the deck m The copper portion copper shield of the deck hanger reduces electrostatic noise in the tape path The plastic portion of the deck hanger clips onto the deck hanger bracket along the rear edge of the deck base The copper shield is attached to the plastic portion of the deck hanger and covers the tape drum and tape p
65. oved bcs ce X RUN REOR EROR E ECE o NOE Ree ES WO Location of Test Points on KRW Location of Ground Points on the KRW Oscilloscope Reading for EXB 8200 Format Servo Read Amplitude Oscilloscope Reading with No Delay Oscilloscope Reading for EXB 8500 Format Servo Read Amplitude Location of Boot PROM on SYS Location of Notch in Boot PROM 5 5 59 kk 8 eb ea Tables Table 2 1 Tools Needed for EXB 8500 Maintenance Procedures 2 2 Table 2 2 Tests and Procedures to Perform after Replacing FRUS 2 7 Table 4 1 Compatibility of the Top Cover with the KRW 4 1 x 510204 Part 1 Preparing for Maintenance 1 General Information 1 General Information This manual provides instructions for performing maintenance procedures on the EXB 8500 Cartridge Tape Subsystem EXB 8500 It lists the diagnostic tools available for the EXB 8500 and recommends approaches to analyzing failures and verifying fixes It explains how to load upgrades to firmware clean the tape path and remove replace and adjust field replaceable units FRUS 1 1 About This Manual October 1991 This manual contains the information described below Part 1 Preparing for Maintenance To prepare for EXB 8500 maintenance read Chapters 1 and 2 These chapters contain the following m Chapter
66. over is compatible with your KRW card For more information about the compatibility of the top cover and the KRW card see Chapter 9 4 1 4 Top Cover Replacement WARNING Before starting any replacement procedures make sure that the EXB 8500 is not in use as follows 1 Make sure that any current operation has completed and that tape motion has stopped Unload the data cartridge by pressing the unload button or issuing a LOAD UNLOAD 1Bh command to the EXB 8500 Disconnect the power cord from the EXB 8500 Disconnect the SCSI cable from the EXB 8500 Move the EXB 8500 to the maintenance area 4 1 Required Tools To replace the top cover you need the following tools v Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v 10 TORX driver bit v T 8 TORX driver bit 4 2 510204 4 Top Cover Replacement 4 2 Removing the Top Cover To remove the top cover follow these steps 1 Remove the five top cover screws as follows see Figure 4 1 a Usea T 8 TORX bit to remove the two screws located on the top of the EXB 8500 near the edges b Usea T 10 TORX bit for the remaining three screws 2 Gently lift the cover at the rear of the EXB 8500 so that the tabs located at the rear and on each side of the top cover are clear of the main housing 3 Move the cover toward the rear of the EXB 8500 to disengage the tabs on the front of the top cover from the faceplate and set the cover aside HA 2
67. r the tape or for the loss of any data resulting from this procedure Any damage to the EXB 8500 caused by this procedure will be repaired as a nonwarranty repair and may void the existing warranty for the EXB 8500 October 1991 16 1 16 Removing Tape from the Tape Path Preliminary Procedure Before attempting the tape removal procedure power the EXB 8500 off and back on again to attempt to clear a possible hang condition If the green LED is lit indicating Ready status press the unload button or issue a LOAD UNLOAD 1Bh SCSI command to unload the data cartridge If the green LED is not lit continue with the instructions in this chapter Required Tools To perform the tape removal procedure you need the following tools 1 flat blade screwdriver v Tweezers V 30 Phillips screwdriver Torque limiting screwdriver 3 4 to 5 0 inch pounds 3 9 to 5 8 kg cm v T 10 TORX bit v T 8 TORX bit v Adhesive tape v Nonconductive tool such as a molded potentiometer adjustment tool 16 2 Preparing the EXB 8500 To remove a data cartridge from a non functioning EXB 8500 first remove these parts in the following order Top cover Chapter 4 Deck hanger Chapter 8 16 2 510204 16 Removing Tape from the Tape Path 16 3 Preparing the Data Cartridge To avoid damaging the tape with the data cartridge door during this procedure you must tape open the data cartridge door To tape the door open follow these steps 1 Ob
68. rocode in one of three ways See Chapter 15 Additional tools required to adjust the servo read amplitude include EXPERT software a blank EXATAPE and an oscilloscope See Chapter 18 for instructions 2 2 510204 2 Approaches to Maintaining the EXB 8500 2 2 Required Test Equipment To perform tests on the EXB 8500 before and after replacing FRUs you need the test software and tapes described in this section Test Software EXABYTE recommends the following software and accompanying user s guides for testing the EXB 8500 m EXABYTE EXPERT software version 6 53 or later and equipment required to run EXPERT EXPERT tests are designed to evaluate the performance of the EXB 8500 during specific types of operations For more information about EXPERT and the equipment required to run EXPERT refer to the EXPERT User s Guide m EXABYTE Monitor software for the EXB 8500 version 10 01 or later and equipment required to run Monitor For more information on Monitor and the equipment required to run Monitor refer to the Monitor User s Guide for the EXB 8500 8mm Cartridge Tape Subsystem Test Tapes This section describes the tapes that are required to test the EXB 8500 and the methods you should follow when creating these tapes Label the tapes appropriately for easy identification Write Read Test Tape This is an EXATAPE 112m tape To make this tape run the EXPERT Inter chg test in 8200 mode on the EXB 8500 being tested Then read
69. rvo Read Amplitude for EXB 8200 Format To adjust the servo read amplitude for EXB 8200 format follow these steps l 18 4 Start EXPERT and load the blank data cartridge into the 8500 Using the EXPERT Short test in EXB 8200 format write a 50 MByte file to tape Once the write operation is complete rewind the data cartridge After you have set up the EXB 8500 and oscilloscope as described in Section 18 2 set the oscilloscope to the following Volts division 200 millivolts Time division 2 milliseconds Locate the potentiometer labeled R15 at the top of the KRW card near the left edge While reading the 50 MByte EXB 8200 format file using the EXPERT Short test use the potentiometer adjustment tool to adjust the R15 potentiometer so that the amplitude for the servo zones displayed on the oscilloscope is 800 millivolts 50 millivolts Note Turn the potentiometer clockwise to raise the amplitude and counterclockwise to lower the amplitude Figure 18 3 shows the oscilloscope reading for the proper adjustment Once the amplitude is adjusted disconnect the oscilloscope from the KRW card and eject the data cartridge 510204 18 Adjusting the Servo Read Amplitude Servo Zones Head Sync Figure 18 3 Oscilloscope Reading for EXB 8200 Format Servo Read Amplitude 18 4 Adjusting the Servo Read Amplitude for EXB 8500 Format To adjust the servo read amplitude for EXB 8500 format fo
70. tain two pieces of adhesive tape each approximately 2 inches 5 cm long 2 Position the two pieces of tape as shown in Figure 16 1 and press them gently to the data cartridge Adhesive lape P a Sy ud 5 Figure 16 1 Taping Open the Data Cartridge Door October 1991 16 3 16 Removing Tape from the Tape Path 16 4 Removing the Erase Head Bracket and Tape Guide The erase head bracket shown in Figure 16 2 is a molded black plastic part mounted onto two posts The erase head is attached to the bracket where the wires emerge and lead to the connector on the SYS card The tape guide also shown in Figure 16 2 is the molded black plastic part that looks like the boom on a crane The tape guide is mounted on three posts The largest post is the primary mounting post and the other two posts are guides for correct positioning of the tape guide To remove the erase head bracket and tape guide follow these steps 1 Use a 0 Phillips screwdriver to remove the small screw that holds the erase head bracket in place see Figure 16 2 Erase Head Bracket Tape Guide Figure 16 2 Location of Screw for Erase Head Bracket 16 4 510204 October 1991 16 Removing Tape from the Tape Path With your thumb and forefinger lift the erase head bracket straight up at the base You do not need to remove the connector and wires from the SYS card since there is sufficient slack in the connector wir
71. the tape on a known good EXB 8500 to verify interchangeability 8200 Mode Interchange Test Tape This is an EXATAPE 112m tape To make this tape run EXPERT WTrtRd test with the density code option set for 8200 mode 14h on the EXB 8500 being tested Then read the tape on a known good EXB 8500 or EXB 8200 if available Carefully check the test tapes to ensure that any failures reported by EXPERT are EXB 8500 related rather than tape related If a media error occurs repeat the test with a known good tape to verify that the failure is EXB 8500 related October 1991 2 3 2 Approaches to Maintaining the EXB 8500 2 3 Static Protection Requirements The testing and maintenance environments for the EXB 8500 must be free of conditions that could cause electrostatic discharge ESD To ensure that these environments are as free from ESD as possible follow these procedures when testing and maintaining the EXB 8500 m Static protection for the testing environment Q Ensure that the power supply connected to the EXB 8500 is properly grounded Q Ensure that the personal computer used for EXPERT and Monitor software and for the SCSI bus is properly grounded m Static protection for the maintenance environment Q Place a static protection mat on the work surface Use a 1 megohm resistor to ground the static protection mat Q Wear a static protection wrist band whenever you handle the EXB 8500 or EXB 8500 cards that have been r
72. tomatic head sync tape for the EXB 8500 For instructions on using this tape see Chapter 17 13 7 Testing the Replacement To test the replacement of the main housing do the following 1 Run the EXPERT WrtVari test 2 Run the EXPERT Motion test If either EXPERT test fails check the EXPERT trace log for causes and to help determine the appropriate action to take Note Referto the EXPERT User s Guide for more information on running EXPERT tests October 1991 13 3 13 Main Housing Replacement Notes 13 4 510204 Part 3 Performing Other Maintenance Procedures 14 Cleaning the EXB 8500 14 Cleaning the EXB 8500 The EXB 8500 s heads and tape path should be cleaned on a regular basis The only cleaning material authorized for use with the EXB 8500 is an EXABYTE manufactured 8mm cleaning cartridge IMPORTANT Using cloth swabs cotton swabs cleaning agents or non EXABYTE cleaning cartridges will void the warranty on the EXB 8500 Use the following guidelines to determine how often to clean the EXB 8500 m When using the EXB 8500 to read and write data in EXB 8500 format clean the tape heads and tape path once a month or after 60 GBytes of data transfer whichever occurs first For planning purposes approximately 2 GBytes of data are transferred per hour of operation in EXB 8500 mode m When using the EXB 8500 to read and write data in EXB 8200 format clean the tape heads and tape path once a month or after 30
73. uct Warranty Caution The EXB 8500 8mm Cartridge Tape Subsystem EXB 8500 is warranted to be free from defects in materials parts and workmanship and will conform to the current product specification upon delivery For the specific details of your warranty refer to your sales contract or contact the company from which the EXB 8500 was purchased The warranty for the EXB 8500 shall not apply to failures of any unit when The EXB 8500 is repaired by anyone other than the Manufacturer s personnel or approved agent The EXB 8500 is physically abused or is used in a manner that is inconsistent with the operating instructions or product specification defined by the Manufacturer The EXB 8500 fails because of accident misuse abuse neglect mishandling misapplication alteration faulty installation modification or service by anyone other than the factory service center or its approved agent The EXB 8500 is repaired by anyone including an approved agent in a manner that is contrary to the maintenance or installation instructions supplied by the Manufacturer The Manufacturer s serial number tag is removed The EXB 8500 is damaged because of improper packaging on return CAUTION Returning the EXB 8500 in unauthorized packaging may damage the unit and void the warranty If you are returning the EXB 8500 for repair package it in its original packaging or in replacement packaging obtained from your vendor Refer to the packing
74. ure 5 2 Separating the Door Parts Front View of EXB 8500 5 2 510204 5 Door Replacement 5 3 Replacing the Door Before attempting to put the door and door retainer on the EXB 8500 practice assembling the two pieces independently of the EXB 8500 Be sure to observe the final relationship of all of the locking tabs so that it is clear how they should look when they are placed on the door mechanism View A in Figure 5 3 shows how the door the door retainer and the door bracket are positioned on the EXB 8500 View B shows a side view of the door the door bracket and the door retainer Door Retainer Door Bracket Door Upper Locking Tak View A Front H 5 Nee Retainer Lower Door Locking Door Bracket View B Side View Figure 5 3 Position of Door Door Retainer and Door Bracket October 1991 5 3 5 Door Replacement To replace the door follow these steps 1 To avoid damaging tape ensure that there 15 no data cartridge in the EXB 8500 2 Position the door on the arms of the door bracket so that the bottom locking tabs on the door are in the notches on the bottom of the door bracket 3 Hold the door in position on the door bracket with your thumb and first finger of one hand and position the door retainer so that the locking tab notches on the bottom of the door retainer are by the locking tabs on the door 4 Sque
75. ving the Deck amp sc ooo REOR RE 12 2 12 4 Replacing the Deck 5 12 3 12 5 Reassembling the EXB 8500 12 3 12 6 Adjusting the Head Sync Timing 12 3 12 7 Testing the Replacement 12 4 13 Main Housing Replacement 13 1 13 1 Req ired TOOS s s s somas ph oe 13 1 13 2 Preparing the EXB 8500 sc zs eae REX Bed ew X ERR 13 2 13 3 Removing the Main Housing 13 2 13 4 Replacing the Main Housing 13 3 13 5 Reassembling the EXB 8500 13 3 13 6 Adjusting the Head Sync Timing 13 3 13 7 Testing the Replacement 13 3 14 Cleaning the EXB 8500 14 3 15 Loading New Microcode to the 8500 15 1 15 1 Deciding Which Loading Method to Use 15 1 15 2 Where to Find Code Loading Information 15 1 16 Removing Tape from the Tape Path 16 1 16 1 Before Starting the Procedure 16 1 Preliminary Procedure 2 a pos RR mom Rm 16 2 Required OCIS ux oe BA mom E Ded sts P 16 2 16 2 Preparing the EXB 8500 ele b om Re 16 2 October 1991 vii 16 3 Preparing the Data Cartridge

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