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TU77 Magnetic Tape Transport User's Guide digital equipment

1. 2 1 2 1 2 Power a wus huahua oiu 2 1 2 1 3 Environmental Reguirementss uio arr erede tus pr IS resa tus sten Meet e d eau as 2 2 2 2 UNPACKING AND INSPECTION Viator min exe utis en 2 2 2 2 1 U packIn 2 2 2 22 Inspection 2 2 2 3 SINGLE TRANSPORT INSTALLATION eene rennen 2 3 2 3 1 Mechanical Installati n a a ap eec err nt iu ten cete o te ils traen do dons 2 3 2 3 2 Power dnd Cabling 2 5 2 4 MULTI TRANSPORT INSTALLATION eene nnns 2 7 2 4 1 ates eae 2 7 2 4 2 Power 2 10 2 5 ACCGEPTANCETESTING au asa eia DUE te cadem dE 2 11 2 5 1 Turn On and Loading lieCKOULb iu keen ass de estan ae eee 2 13 2 5 1 1 POWGE OD dcn 2 13 2 5 12 Load Sequence Without 2 14 2 5 1 3 Inhibited Autoload Sequence r 2 14 2 5 1 4 Autoload Seguent assit aie mrs eiae evo eii pu 2 14 2 5 1 5 Manual Load Sequences adotta sense E vette tee ped usd 2 16 2 5 1 6 Unload Sequence mcos notat esie Pda ia Do oae esses iuto ando 2 16 2 5 1 7 Manual Load Repeatability 2 16 2 5 1 8 Autoload Repeatability s uei eo rena
2. 1 12 Mechanical and Electrical Specifications eese 1 13 PrumarviPowerConnectlonSus edis eo vase obe etate avena OR ma Morse 2 6 Motor Pulley Part Numbers 2 7 TM03 TU77 Diagnostics Used for Acceptance Testing 2 18 TUTTCOnD0ls5 asa eb uuu tea ae one ente wud sue b M cU E UE 3 1 TUZI Indicators ag sua a i raa yip a ae ease used des Das 3 2 9109 5 A0380 Frontispiece TU77 Tape Transport CHAPTER 1 GENERAL DESCRIPTION 1 1 INTRODUCTION The TU77 is a magnetic tape transport that records and reads data in 9 track non return to zero NRZI or phase encoded PE format Bit density is 800 bits per inch BPI for the NRZI format and 1600 BPI for the PE format The transport can read data in the forward or reverse direction The read write tape speed for both the forward and reverse directions is 125 inches per second IPS The nominal rewind time for a 731 5 m 2400 ft reel is 65 seconds MASSBUS Dus TAPE CONTROLLER FORMATTER TRANSPORT TO 1 7 TO 1 3 1 PDP 11 amp RH11 OTHER OTHER 2 DECsystem 20 KL10 amp RH20 TMO3 TRANSPORTS 8851 3 PDP 11 780 VAX FORMATTERS Figure 1 1 Basic System Configuration The TU77 transport interfaces with the system processor via the Massbus a Massbus controller and a TMO3 tape formatter Up to four TU77s may be driven from one TMO3 formatter Figure 1 1 illus
3. BOT MARKER HAS PASSED BOT SENSOR AND IS ON THE TAKE UP S E REEL BOT MARKER 15 TOO FAR FROM BEGINNING OF TAPE MARKER SHOULD BE FROM 4 3 TO 4 9 M 14 TO 16 FT FROM BEGINNING OF TAPE RE POSITION THE MARKER AND REPEAT THE AUTOLOAD PROCEDURE IF IT IS DESIRED TO CONTINUE OPERATION ROTATE THE TAKE UP REEL UNTIL THE BOT MARKER IS ON THE REEL PERFORM A MID REEL LOAD BY ROTATING THE TAKE UP REEL TO REMOVE ALL SLACK IN THE TAPE WITH THE TAPE TIGHT PRESS THE COMPLETES ABOUT TEN REVOLUTIONS THREADS AND WRAPS ONTO THE TAKE UP REEL BOT AND STOPS bot LIGHT NO SUPPLY REEL BACKWINDS THE TAPE AND STOPS TAKE UP REEL COMPLETES ABOUT TEN REVOLUTIONS SUPPLY REEL BACKWINDS ALLTHE TAPE AND THEN ROTATES FORWARD EJECTING TAPE INTO THE TAPE PATH THREADS AND WRAPS ONTO THE TAKE UP REEL NO TAKE UP REEL STOPS load fault LAMP FLASHES ON AND OFF CHECK PARAGRAPH 3 2 5 FOR PROBABLE CAUSE ATTEMPT ANOTHER AUTOLOAD IF THE AUTOLOAD PROCEDURE FAILS AGAIN REPORT PROBLEM TO MAINTENANCE TO CONTINUE OPERATION TRY LOADING THE TAPE MANUALLY PARAGRAPH 3 2 4 REPEAT THE AUTOLOAD PROCEDURE WITH ANOTHER REEL OF TAPE IF THE LOAD SEQUENCE IS STILL UNSUCCESSFUL CALL MAINTENANCE PERSONNEL Figure 3 4 Autoload Sequence with Operator Troubleshooting RESET BUTTON AND THEN THE L
4. REPEAT THE MANUAL LOAD PROCEDURE WITH ANOTHER REEL OF TAPE IF THE LOAD SEQUENCE IS STILL UNSUCCESSFUL CALL MAINTENANCE PERSONNEL YES 2656 Figure 3 6 Manual Load Sequence with Operator Troubleshooting A mid reel load is usually required after a power failure or a lost interlock 1 2 3 The transport loads tape and starts a reverse operation Rotate the take up reel to remove all slack in the tape CAUTION Do not attempt mid reel load until all slack is manually removed from the tape between the reels Press the RESET button Press the LOAD REW button RESET button Any other command may now be given 3 2 7 1 2 Unload Press the RESET button to terminate any on going operation and place the transport off line Press the UNLOAD button If the tape is at BOT it will backwind onto the supply reel If the tape is at mid reel it will rewind to BOT and then unload backwind onto the supply reel 3 7 to BOT To stop the transport press the 3 2 8 Rewind Pressing the LOAD REW button with tape tensioned and the transport off line the tape rewinds to BOT When the button is pressed with the tape at BOT no action occurs 3 2 9 On Line Off Line Pressing the ON LINE button places the transport on line and illuminates the on line light While on line the transport can accept external commands provided it is selected and ready If the ON LINE button is pressed again the transp
5. PULLEY COVER BLOWER MA 2643 Figure 1 5 Power Pack Assembly Rear View Figure 1 5 illustrates the power pack assembly containing the following items Rectifiers 3 Part Numbers 29 23311 29 23312 Vacuum hose Fuse panel Air filter P N 29 23259 Blower P N 29 23253 Pulley cover Power transformer terminal strip Compressor P N 29 23257 Motor P N 29 23254 Transformer P N 29 23258 MASSBUS CONTROLLER FORMATTER 0 TM03 TAPE FORMATTER TU77 NO n 1 TO 3 2642 Figure 1 6 Possible TU77 Configurations 1 3 FUNCTIONAL DESCRIPTION Figure 1 6 illustrates the various TU77 configurations that are possible from the Massbus The tape formatter interfaces up to four TU77 transports to the Massbus Additional 035 may be added up to a maximum of eight with each formatter interfacing up to four additional TU77s Thus the maximum configuration interfacing a Massbus controller consists of eight TM03 formatters and 32 TU77 transports The TMO3 tape formatter is housed the TU77 cabinet Those TU77 cabinets containing a TM03 and its associated H740 DA power supply are designated as master transports while those without the and H740 DA are designated as slave transports The basic transport within a TU77 master is identical to a TU77 slave transport Figure 1 7 is a functional block diagram of a master TU77 tape transport During a write operation
6. 2 5 2 1 Control Logic Test No 1 Run control logic test no 1 for two passes No errors are allowed Run the test again with manual intervention 2 5 2 2 Control Logic Test No 2 Run control logic test no 2 for two passes No errors are allowed 2 5 2 3 Basic Function Test Run the PDP 11 basic function test for two passes No errors are allowed Run the DECsystem 20 basic function test B1 and B2 for one pass each No errors are allowed 2 5 2 4 Drive Function Timer Run the PDP 11 or VAX 11 780 drive function timer diagnostics for two passes No out of range errors are allowed 2 5 2 5 Data Reliability NOTE In using the data reliability diagnostic on the PDP 11 DECsys tem 20 and PDP 11 780 VAX do not count errors caused by bad tape PDP 11 System Using 11 DZTED l Run the data reliability test for one pass in NRZI mode with the following parameters Density 3 Parity 0 Format 14 Record count 1 Character count 20 Pattern number 1 Tape mark 1 Interchange read 0 Single pass 1 CRC correction 0 Stalls Read 1 Write Turnaround 1 Before typing the last CR set the console switches to 000720 Then type CR to run the test The following errors are allowed hard errors read and write 2 soft write errors 2 soft read errors 2 Run the data reliability test for one pass in PE mode with the following parameters Density 4 Parity 0 Format 14 Record count 1 Characte
7. supply reel has a full reel of tape The tape must be between 0 64 and 1 59 1 4 and 5 8 in from the outer edge of the reel 3 6 3 2 6 PRESS RESET BUTTON PRESS LOAD REW BUTTON TAKE UP REEL STARTS TO TURN CW SUPPLY REEL ROTATES CW THREADS AND WRAPS ONTO TAKE UP REEL YES bot LIGHT FLASHES ONCE TAPE ENTERS VACUUM COLUMNS AND LOOPS ARE TO BOT AND STOPS bot LIGHT COMES ON YES NO TAKE UP REEL COMPLETES ABOUT TEN REVOLUTIONS TAKE UP REEL STOPS load fault LIGHT FLASHES ON AND OFF CHECK PARAGRAPH 3 2 5 FOR PROBABLE CAUSE ATTEMPT ANOTHER MANUAL LOAD IF THE MANUAL LOAD PROCEDURE FAILS AGAIN CALL MAINTENANCE PERSONNEL Mid Reel Load TAPE HAS A BOT INSTALL A BOT MARKER 4 6M 15 FT FROM THE BEGINNING OF THE TAPE REPEAT THE MANUAL LOAD PROCEDURE PASSED BOT SENSOR AND IS ON THE TAKE UP REEL BOT MARKER IS TOO FAR FROM BEGINNING OF TAPE MARKER SHOULD BE FROM 4 3 TO 4 9M 14 TO 16 FT FROM BEGINNING OF TAPE RE POSITION THE MARKER AND REPEAT THE MANUAL LOAD PROCEDURE OR IF IT IS DESIRED TO CONTINUE OPERATION ROTATE THE TAKE UP REEL UNTIL THE BOT MARKER 1 ON THE REEL PERFORM A MID REEL LOAD BY ROTATING THE TAKE UP REEL TO REMOVE ALL SLACK IN THE TAPE WITH THE TAPE TIGHT PRESS THE RESET BUTTON AND THEN THE LOAD REW BUTTON RUNS REVERSE TO BOT AND STOPS bot LIGHT
8. 2 2 Inspection After unpacking the TU77 transport inspect it and report any damage to the responsible shipper and the local DIGITAL sales office Inspect as follows 1 Inspect all switches indicators and panels for damage 2 Open TU77 front door Depress the upper and lower release buttons and open the buffer box door Check that the buffer box door is tightly secured to the cabinet Inspect for foreign material loose or damaged components and for glass damage Units shipped outside the continental United States have an additional wooden container around the cardboard carton The side panels of the container are bolted together 2 2 8 Check the transport for any foreign material that may have lodged in the take up reel or other moving parts Rotate the supply hub and take up reel Check for binding and physical damage Rotate the capstan Check for binding and physical damage CAUTION The capstan is fragile Do not touch the capstan rubber surface and do not apply pressure to the capstan which might cause it to deform Check tape path for any sharp edges Close the buffer box door by pressing the two release buttons using moderate pressure The buttons will not catch if pressed too hard Close the TU77 front door 2 3 SINGLE TRANSPORT INSTALLATION 2 3 1 Mechanical Installation After the shipping container has been removed and visual inspection has been performed roll the transport cabinet into position and pro
9. ENERGIZE SUPPLY REEL TURNS CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE PRESSURE AND VA CUUM SOLENOIDS DE ENERGIZE SUPPLY REEL STOPS TAKE UP REEL STOPS AC MO TOR STOPS load fault LAMP FLASHES ON AND OFF file protect LAMP COMES ON PRESS RESET BUTTON CARTRIDGE MOTOR CLOSES load fault LAMP GOES OUT MA 2649 Figure 2 15 Load Sequence Without Tape Figure 2 16 Inhibited Autoload Sequence 2 5 1 2 Load Sequence Without Tape With no tape reel mounted on the supply hub follow the instructions and check for the events specified in Figure 2 15 2 5 1 3 Inhibited Autoload Sequence Install a write enable ring on a large 267 mm 10 1 2 in reel of tape Tape the leader to prevent magnetic tape from coming off the reel Mount the reel onto the supply hub Close the transport front door so the interlock can enable the autoload sequence If it is desired to leave the door open override the interlock by pulling it out Follow the instructions and check for the events specified in Figure 2 16 2 5 1 4 Autoload Sequence Remove the tape from the leader allowing the magnetic tape to come off the supply reel Check that the leader has no creases or rips If necessary cut the end of the tape with the tape crimper P N 47 00038 Leave the write enable ring installed If a wraparound cartridge is not used close the transport front door so the interlock can enable the autoload sequence If it is desired to leave the door op
10. Red Wire Input Voltage Blue Wire 198 205 206 215 216 225 226 235 236 245 246 255 Replace the cover and connect the power pack connector 5 Check that the circuit breaker on the rear of the power pack is in the on up position 6 Remove the pulley cover from the rear of the transport power pack Figure 2 8 and check that the ac motor pulley is the proper one for the source frequency and altitude as shown in Table 2 2 The variation of the vendor part number is stamped on the pulley Spin the ac motor pulley by hand and check that the blower and com pressor belts are tight and track properly Replace the pulley cover 7 Connect the BC06S round Massbus cable to the in connector on the rear of the TU77 Figure 2 9 8 Connect a Massbus terminator into the out receptacle 2 6 POWER TRANSFORMER TERMINAL STRIP TERMINAL NO 1 TERMINAL NO 9 INI qo e Sg CIRCUIT BREAKER MOTOR PULLEY COMPRESSOR PULLEY PULLEY MA 2663 Figure 2 8 Rear of Power Pack with Pulley Cover Removed Table 2 2 AC Motor Pulley Part Numbers DEC Altitude Part Number Vendor Part Number Frequency 60 Hz 29 23299 108478 01 60 Hz 29 23300 108478 02 50 Hz 29 23301 108478 03 29 23302 108478 04 Low Under 1 220 M 4 000 ft High Over 1 220 M 4 000 ft 9 Connect the remote switching control bus from the CPU to one of the three jacks on the 861 next to
11. TAPE uh ede ce nnd 4 1 CUSTOMER PREVENTIVE MAINTENANCE OF TU77 TAPE ERAN S PO ROE t Sen aes i a PER c entice 4 2 4 2 Preventive Maintenance n usus uhay ea plea aA 4 2 Magnetic Tape Transport Cleaning 4 2 Cleaning the TU77 Tape Transport 4 3 GLOSSARY FIGURES Title Page Basic System Configuration cena tones eens 1 1 TUTT Master Tape Transport een ER e aba et 1 2 u chad oie mia S onm T UE 1 4 Crd O 1 6 Power Pack Assembly Rear View ccsssseseccecccseeseeececcceeveeseseeeseeusaeeeessssseeuanes 1 7 Possible T U77 Configurations esser ee coh e ia die EH paw pu ec ERE apa vedo 1 8 Master TU77 Functional Block Diagram 1 9 Space and Service Clearance View uiuos oa a ere venite eue SER RE WEE FREQ ves 2 1 Caster Lock ASSEN OLY eoe esc puc aun a eiie retire nae ea ar 2 2 Location of Stabilizer Arm and Leveler 2 4 Rear Door Opening Tool micis Pa ed trepidi SO a aS cH ENS RENS 2 4 Location of TM03 Shelf Locking Pins and Power Pack Connector 2 4 PCB Shtipping Bracke bese scc apan d p etus Meets vati s ie cie E 2 5 S61B Power Control Patel i esercito E 2 6 Rear of Power Pack with Pulley Cover Removed esee eee 2 7 Massbus Connection to TU77 Master 2 8
12. TU77 internal cabling as follows a Power cable from 861 switched outlet to transport power pack Figure 2 5 b Power cable from 861 switched outlet to cabinet blowers c Power cable from 861 switched outlet to H740 DA power supply d H740 DA power cabling to TM03 TMO3 cabling to Massbus connector panel f TM03 cabling to the three connectors the M8940 MTA board Check that the power on off circuit breaker on the 861 is on and the remote local switch is set to REMOTE ON Figure 2 7 Check fuses on power pack fuse panel Figure 1 5 The fuses can be seen from the front of the cabinet On the master transport it is necessary to fully extend the TMO3 shelf to see the fuse panel A closer view can be obtained from the rear of the cabinet by looking over and down onto the fuse panel Remove the cover from the power transformer terminal strip Figure 2 8 The ac input plug on the power pack must also be removed Check that the blue brown and white red wires are connected to the lower terminals as shown in Table 2 1 The terminals are numbered 1 through 9 from left to right Replace the cover and connect the power pack connector Master TU77 only See 7M03 User s Manual or TM03 Technical Manual for TMO3 cabling The TMO03 manuals are listed in Table 1 1 2 10 5 Check that the circuit breaker on the rear of the power pack is in the on up position 6 Remove the pulley cover from the rear of the transport power pack Fi
13. Top COVED Fasteners doi rade erede Ras eras sade ist aq haku cue 2 9 Corporate Cabinet with Side Panels and Top Cover Removed 2 9 lv 1 I 1 1 V 1 1 Oa d L N N u BW WW W WH WN F2 FIGURES Cont Title Page Slave Bus Cabling of TU77 Daisy Chain eese 2 12 Cable Orientation on M8940 MTA Module sene 2 13 A nats see cqui Dri 2 13 Load sequence Without visos aimi te eI maces 2 14 Inhibited Autoload Sequence cu be P OR REX EA tid ae 2 14 Autoload SequemQel uu cou ulus a aaa 2 15 Manu l Load SEque nCes sierras d ua EIE DIA w du DR aM ee bcp ea uds 2 16 Unload SeQ ue ge_ ort RTT E 2 17 TOT Control Panel seio tects 3 1 Autoload Manual Load Selection 3 3 Tape Content Wim oe cae 3 3 Autoload Sequence with Operator Troubleshooting 3 5 Tape Pathand Controls se rco S vec metes 3 6 Manual Load Sequence with Operator Troubleshooting 3 7 Transport Items Tor Daily Cleaning eate debt ehe urea deter m aee gud 4 3 TABLES Title Page Applicable Documents ioc oce roa ah oe a dot rd a RES SPURS FAN EM
14. contained in the kit to clean tape heads air bearings tape guide blocks the tape cleaner capstan reel hubs and any part of the transport where a dirty residue could ultimately come in contact with tape To clean other parts of the transport such as the exterior surfaces of doors use any reasonably clean lint free material with or without cleaning fluid NOTE For an unusually stubborn dirt deposit that appears to resist TF113 try a mild soap and water solution to dislodge it After using soap be sure to wash down the affected area thoroughly with TF113 to remove soapy residues 4 3 4 Cleaning the TU77 Tape Transport l Dismount the tape from the unit 2 Clean the following components of the transport using a foam tipped swab soaked in cleaning fluid Figure 4 1 Read write head Erase head Tape cleaner Air bearings 6 Spring loaded ceramic tape guides 2 Thread blocks 6 Capstan Buffer boxes 2 Pucker pocket Buffer box glass pocket glass door overlay 4 3 NOTE Perform all cleaning using foam tipped swabs Do not touch any part of the tape path as oil from fingers attracts dust and dirt Also excessive physical pressure on the capstan could affect cap stan alignment When cleaning the thread blocks be sure to clean the air guide ports Every thread block has air guide ports except the metal block containing the spring loaded tape guide When cleaning the spring loaded ceramic guides be sure that the wa
15. opening tool Figure 2 4 into the rear door and turn one quarter turn in a counter clockwise direction and open the door Remove the locking pins from the rear of the TMO3 shelf slide assembly Figure 2 5 Open the transport front door Using a screwdriver release the service lock located in the lower right corner of the base assembly Swing the base assembly open NOTE The base assembly will not swing open unless the stabilizer arms are extended step 9 2 3 INTERLOCK STABILIZER ARM _ LEVELER PAD LEVELER FOOT Figure 2 3 Location of Stabilizer Arm and Leveler Feet 11 5612 LOCKING PINS INPUT POWER CONNECTOR TO POWER PACK SIDE VIEW END VIEW 11 5611 MA 2647 Figure 2 4 Rear Door Opening Tool Figure 2 5 Location of TM03 Shelf Locking Pins and Power Pack Connector 2 4 2 ves 5 m ate DATA L PCB gt 6 25 d te TD ae ce CAPSTAN SERVO PCB REEL SERVO PCB MA 2645 Figure 2 6 PCB Shipping Bracket 13 Remove the PCB shipping bracket by pushing in on the lower front and pulling down from underneath Figure 2 6 14 Check seating of PCBs in their sockets 2 3 2 Power and Cabling l Check TU77 internal cabling as follows a Power cable from 861 switched outlet to transport power pack Figure 2 5 b Power cable
16. percent 2 2 UNPACKING AND INSPECTION 2 2 1 Unpacking The TU77 H9500 cabinet comes packed in an extra strong corrugated cardboard container that measures approximately 76 cm 30 in wide 89 cm 35 in long and 147 cm 58 in high The cabinet is shipped on its casters which raises the shipping carton about 7 cm 2 3 4 in off the floor The casters are a shock isolating type thus eliminating the need for shipping skids Caster locks are supplied with each cabinet Figure 2 2 These locks function to facilitate cabinet movement by preventing two of the four casters from swiveling They also assist in providing cabinet stability by restricting the direction of cabinet movement These caster locks are mounted with hardware and may be removed when it be comes necessary to allow omni directional movement during installation In any case the locks are to be removed when the cabinet has been installed at its final destination The locks are to be stored with the cabinet and may be used again if the cabinet has to be moved WHEEL LOCK ASS Y TYP BOTH CASTERS ON ONE SIDE OF CABINET IMPORANT BEFORE ASSEMBLING WHEEL LOCK PLACE CASTERS AS SHOWN 11 5613 Figure 2 2 Caster Lock Assembly To unpack the TU77 from its shipping container proceed as follows 1 Cut the plastic bands around the container 2 tape on the top and sides of the container 3 Remove and dispose of the container The container is not reuseable 2
17. the TM03 accepts write data from the Massbus and formats it into 8 bit data characters for the TU77 transport Massbus data is in PDP 10 compatible PDP 10 core dump PDP 11 normal or PDP 15 normal format The TM03 disassembles the Massbus data under control of the CPU which specifies the format of the data During a read operation 8 bit characters received from the transport are 1 8 6 1 REMOTE SWITCHING CONTROL BUS POWER ON OFF FROM CPU AC LINE INPUT POWER 861 POWER CONTROL AC LINE H740 DA POWER SUPPLY 5V 15V 15V DC LO AC LO WRITE DATA TMO3 READ DATA TAPE CONTROL COMMANDS FORMATTER STATUS SIGNALS TO OTHER TU77 s MASTER TU77 ONLY TAKE UP PRESSURE TRANSDUCER TRAN POWER SUPPLY AND DISTRIBUTION SPORT COOLING REGULATED DC FANS SUPPLY SERVO FEEDBACK 3 AC LINE MTA M8940 AUTOLOAD 1 MOTION COMMANDS SUPPLY REEL SERVO SUB SYSTEM SUPPLY REEL TAKE UP LIMIT SWITCH CONTROL LOGIC amp MANUAL CONTROLS TO ERASE HEAD TO WRITE HEAD READ WRITE SUB SYSTEM COMMANDs CAPSTAN SERVO SUB SYSTEM CAPSTAN DRIVE 4 4 TACHOMETER OUTPUT CAPSTAN CAPSTAN TACHOMETER MOTOR VACUUM SENSE VAC PRES FROM BLOWER PRESSURE Figure 1 7 Master TU77 Functional Block Diagram TAKE UP LOOP PNEUMATIC COLUMN BUFFER BOX SUPPLY PRESSURE TRANS
18. will cause the pressure in the chamber to rise Conversely if the loop becomes smaller the pressure in the chamber will decrease Pressure transducers are connected to the supply and take up chambers The pressure variations are interpreted by the pressure transducers to provide the supply and take up servo feedback signals The pressure sensitive feedback signals are fed back to the reel servos to adjust the velocity of the reel motors for the proper loop in the two buffer boxes The uppermost and lowermost holes in each buffer column are limit ports The limit ports connect to supply and take up limit switches which feed back to both the take up and supply servos Should the tape cross a limit port in either the supply or take up columns a disabling signal is coupled back to the servos stopping both reel motors before tape dam age occurs A pneumatic interlock exists which shuts down the capstan servo and the reel servos if a pneumatic failure is detected The pneumatic subsystem contains a blower to create the vacuum for the tape columns and a compressor to generate pressure for the tape path bearings Vacuum and pressure are monitored by sensing devices If either is lost the sensing device sends a VAC PRES signal to the three servo subsystems stopping the servo motors and preventing tape damage The read write subsystem processes and transfers data to and from the magnetic tape The read func tion processes data picked up from the tape by
19. 2 17 2 5 2 TMOS TUTT Dig en Osties u l oud 2 18 2 5 2 1 Control lotic Test rto t iex waqan Peer EA 2 19 2 5 2 2 Control Logic Test No o ee aqa mex eode dou 2 19 2 5 2 3 B sic F nctron 2 19 2 5 2 4 Drive PUNCH Om 2 19 2 5 2 5 Data Reliability cear a aan 2 19 CHAPTER 3 OPERATION 3 1 CONTROLSANDINDICATORS r aes 3 1 3 2 OPERATING PROCEDURES HRS ea Rb tlc es 3 2 3 2 1 Power na ate ur ies aao cte eise Qa aq iR yuya 3 2 3 2 2 Autoload Manual Load Selection a 3 2 ill b Ro b b P2 b do ND 1 ON tn gt APPENDIX A TIN Q Q 2 ON IIO CONTENTS Cont Page COLO PEAN f 3 3 Manual md So sates ist datas 3 4 Probable Causes of Load Failure ior ee HERE HEAR EXER E 3 6 n bre rro P P 3 7 Unload n 3 7 ICewIng icono ese DU 3 8 Ow Line LOT Lines m RA udo DEL DATI rd 3 8 CUSTOMER CARE AND PREVENTIVE MAINTENANCE CUSTOMER RESPONSIBILITIES 4 1 CARE OF MAGNETIC
20. DUCER LIMIT SUPPLY LIMIT SWITCH SUPPLY LOOP PNEUMATIC COLUMN BUFFER BOX formatted into data words and placed on the Massbus The reassembles the data characters into the Massbus format specified by the CPU The TMO3 writes and reads data in either 800 NRZI or 1600 BPI PE formats During write operation the generates a parity bit for each 8 bit data character written on tape The parity bit is added to the data character thereby providing 9 bit tape characters to the transport Error detection is accomplished by parity checks and during NRZI operation cyclic redun dancy checks CRC and longitudinal redundancy checks LRC Error detection occurs for both read and write operations During a write operation a read after write function is performed where the data just written on tape is read by the TMO03 and undergoes error checking During read operations the TM03 can perform error correction of single track errors in both NRZI and PE PE single track correction occurs automatically while NRZI single track error correction is under software control and must be implemented by the program The TMO3 also controls and monitors tape transport operation It receives operational commands from the CPU and then selects the desired transport and issues functional and motion commands It monitors transport operation and provides error and status information to the CPU The H740 DA power supply supplies reg
21. EK TU77 UG 001 TU77 Magnetic Tape Transport User s Guide digital equipment corporation maynard massachusetts Ist Edition February 1979 The drawings and specifications herein are the property of Digital Equipment Corporation and shall not be reproduced or copied or used in whole or in part as the basis for the manufacture or sale of equipment described herein without written permission Copyright 1979 by Digital Equipment Corporation The material in this manual is for informational purposes and is subject to change without notice Digital Equipment Corporation assumes no re sponsibility for any errors which may appear in this manual Printed in U S A This document was set on DIGITAL s DECset 8000 computerized typesetting system The following are trademarks of Digital Equipment Corporation Maynard Massachusetts DIGITAL DECsystem 10 MASSBUS DEC DECSYSTEM 20 OMNIBUS PDP DIBOL OS 8 DECUS EDUSYSTEM RSTS UNIBUS VAX RSX VMS IAS CONTENTS Page CHAPTER 1 GENERAL DESCRIPTION 1 1 INTRODUCTION 1 1 1 2 PHYSICAL DESCRIPTION EU 1 1 1 3 FUNCTEIONALDESCRIPTI N u aa Beste kot E CH hp HE CER pay 1 8 1 4 APPLICABLE DOCUMENTS repa aot ode exec noun edes ametur aad 1 12 1 5 MECHANICAL AND ELECTRICAL SPECIFICATIONS eee 1 13 CHAPTER 2 INSTALLATION 2 1 SITE PLANNING AND 2 1 2 1 1 Space CG 1 4
22. EL YES REPEAT THE MANUAL LOAD PROCEDURE WITH ANOTHER REEL OF TAPE IF THE LOAD SEOUENCE IS STILL UNSUCCESSFUL RE FER TO TROUBLE SHOOTING PROCEDURES IN CHAPTER 6 OF THE TECHNICAL MANUAL LOOPS ARE SET TO BOT AND STOPS NO bot LIGHT INSTALL A BOT MARKER 4 6M 15 FT FROM THE BEGINNING OF THE TAPE REPEAT THE MANUAL LOAD PROCEDURE BOT MARKER IS TOO FAR FROM BEGINNING OF TAPE MARKER SHOULD BE FROM 4 3 TO 4 9M 14 TO 16 FT FROM BEGINNING OF TAPE REPOSITION THE MARKER AND REPEAT THE MANUAL LOAD PROCEDURE IF THE SAME PROBLEM OC CURS AGAIN REPEAT THE PROCEDURE WITH ANOTHER REEL OF TAPE IF THE LOAD SE QUENCE IS STILL UN SUCCESSFUL REFER TO TROUBLE SHOOTING PRO CEDURES IN CHAPTER 6 OF THE TECHNICAL MANUAL Figure 2 18 Manual Load Sequence TAKE UP REEL COMPLETES ABOUT TEN REVOLUTIONS SUPPLY REEL STOPS PRESSURE AND VACUUM SOLENOIDS DE ENERGIZE SUPPLY REEL TURNS CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE TAKE UP REEL STOPS SUPPLY REEL STOPS PRESSURE AND VA CUUM SOLENOIDS DE ENERGIZE AC MOTOR STOPS file protect LAMP COMES ON load fault LAMP FLASHES ON AND OFF CHECK PARAGRAPH 3 2 5 FOR PROBABLE CAUSE ATTEMPT ANOTHER MANUAL LOAD IF THE MANUAL LOAD PROCEDURE FAILS AGAIN REFER TO TROUBLE SHOOTING PRO CEDURES IN CHAPTER 6 OF THE TECHNICAL MANUAL MA 2655 2 5 1 5 Manual Load Sequence Install a write enable ring on a 216 or 178
23. N 800 LAMP COMES ON power LAMP COMES ON file protect LAMP COMES ON ALL OTHER LAMPS ARE OFF 2653 Figure 2 14 Power On 2 13 PRESS RESET BUTTON PRESS LOAD REW BUTTON AC MOTOR STARTS TAKE UP REEL TURNS CW NO SUPPLY HUB MOTION CARTRIDGE MOTOR OPENS PRESSURE AND VACUUM SOLENOIDS ENERGIZE SUPPLY HUB ROTATES CW TAKE UP REEL COMPLETES ABOUT TEN REVOLUTIONS SUPPLY HUB STOPS PRESSURE AND VACUUM SOLENOIDS DE ENERGIZE SUPPLY HUB ROTATES CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE TAKE UP REEL STOPS SUPPLY HUB STOPS AC MOTOR STOPS PRESSURE AND VAC UUM SOLENOIDS DE ENERGIZE load fault LAMP FLASHES ON AND OFF PRESS RESET BUTTON CARTRIDGE MOTOR CLOSES load fault LAMP GOES OFF MA 2639 PRESS RESET BUTTON PRESS LOAD REW BUTTON file protect LAMP GOES OFF AC MOTOR STARTS CARTRIDGE MOTOR OPENS TAKE UP REEL TURNS CW NO SUPPLY REEL MOTION SUPPLY REEL TURNS CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE SUPPLY REEL TURNS CW TAKE UP REEL COMPLETES ABOUT TEN REVOLUTIONS SUPPLY REEL STOPS PRESSURE AND VACUUM SOLENOIDS DE ENERGIZE SUPPLY REEL TURNS CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE SUPPLY REEL TURNS CW TAKE UP REEL COMPLETES ANOTHER TEN REVOLUTIONS SUPPLY REEL STOPS PRESSURE AND VACUUM SOLENOIDS DE
24. NG OF TAPE MARKER SHOULD BE FROM 4 3 TO 4 9 M 14 TO 16 FT FROM BEGINNING OF TAPE REPOSITION THE MARKER AND REPEAT THE AUTOLOAD PRO CEDURE IF THE SAME PROBLEM OCCURS AGAIN REPEAT THE PROCEDURE WITH AN OTHER REEL OF TAPE IF THE LOAD SE QUENCE IS STILL UN SUCCESSFUL REFER TO TROUBLE SHOOTING PRO CEDURES IN CHAPTER 6 OF THE TECHNICAL MANUAL TAKE UP REEL COMPLETES ABOUT TEN REVOLUTIONS SUPPLY REEL STOPS PRESSURE AND VACUUM SOLENOIDS DE ENERGIZE SUPPLY REEL TURNS CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE TAKE UP REEL STOPS SUPPLY REEL STOPS PRESSURE AND VA CUUM SOLENOIDS DE ENERGIZE AC MOTOR STOPS load fault LAMP FLASHES ON AND OFF CHECK PARAGRAPH 3 2 5 FOR PROBABLE CAUSE ATTEMPT AN OTHER AUTOLOAD IF THE AUTOLOAD PRO CEDURE FAILS AGAIN REFER TO TROUBLE SHOOTING PRO CEDURES IN CHAPTER 6 OF TECHNICAL MAN UAL MA 2658 PRESS RESET BUTTON PRESS LOAD REW BUTTON file protect LAMP GOES OFF AC MOTOR STARTS CARTRIDGE MOTOR OPENS TAKE UP REEL TURNS CW NO SUPPLY REEL MOTION PRESSURE AND VACUUM SOLENOIDS ENERGIZE SUPPLY REEL ROTATES CW TAPE THREADS AND NO WRAPS ONTO TAKE UP REEL YES bot NO LAMP FLASHES ONCE YES PRESSURE AND VACUUM SOLENOIDS DE ENERGIZE TAPE ENTERS VACUUM COLUMNS TAPE HAS A BOT MARKER NO YES BOT MARKER HAS PASSED BOT NO SENSOR AND IS ON THE TAKE UP RE
25. OAD REW BUTTON TO BOT AND STOPS bot LIGHT MA 2657 AIR BEARING NO 1 SUPPLY REEL THREAD BLOCK NO 1 _ AIR BEARING NO 3 LOAD FAULT CARTRIDGE MOTOR INDICATOR 7 1 AIR BEARING NO 2 7A AIR BEARING NO 4 SUPPLY PUCKER POCKET FILE PROTECT INDICATOR ON LINE INDICATOR BOT INDICATOR POWER INDICATOR TAKE UP BUFFER BOX SLAVE SELECT LOAD REW VACUUM CAPSTAN 800 INDICATO 1600 INDICATOR AIR BEARING NO 5 TAPE CLEANER MA 2640 Figure 3 5 Tape Path and Controls 3 2 5 Probable Causes of Load Failure 1 Check that the buffer door is closed and sealed properly 2 Check for ripped creased or damaged tape leader This is especially critical if an autoload failure has occurred If necessary crimp the end of the tape with a tape crimper 3 Check that the write enable ring is inserted in the tape reel if a write operation is to be performed File protect indicator should be out 4 Check that the transport front door is open and the autoload interlock switch is not pulled out if a manual load is being performed with a 267 mm 10 1 2 in reel of tape 5 If an autoload is being performed check that a A large 267 mm 10 1 2 in reel of tape is on the supply hub b The supply reel has a wraparound cartridge If not check that the transport door is closed or if the door is open that the interlock switch is pulled out c
26. Run the PE IR test for one pass The following errors are allowed 0 read errors hard or soft Revision B or higher 2 20 PDP 11 780 VAX System using ZZ ESMAA Run the data reliability test for one pass in NRZI mode Supply the requested information The following errors are allowed 1 hard errors read and write 2 soft write errors 2 soft read errors 2 Run the data reliability test for one pass in PE mode Supply the requested information The following errors are allowed hard errors read and write 4 soft write errors 2 soft read errors 2 21 CHAPTER 3 OPERATION 3 1 CONTROLS AND INDICATORS The TU77 operational controls and indicators are located on the transport control panel The controls and indicators are illustrated in Figure 3 1 and listed in Tables 3 1 and 3 2 SEE NOTE power O bot O on line file protect load fault LOAD REW ON LINE UNLOAD RESET Note Slave select switch not labeled on panel MA 2662 Figure 3 1 TU77 Control Panel Table 3 1 TU77 Controls Control Function Slave Select Switch Selects the address slave number 0 to 3 of the tape transport unlabeled LOAD REW Pressing and releasing the LOAD REW button will initiate one of three se quences 1 With no tape in path load sequence is initiated 2 With tape in path but not tensioned a mid reel load sequence will be initiated In a mid reel load sequence the tape will load and
27. TERLOCK SWITCH PULLED OUT NO NO FULL REEL OF TAPE YES MANUAL LOAD AUTO LOAD PROCEDURE PROCEDURE PARAGRAPH 3 2 4 PARAGRAPH 3 2 3 MA 2763 Figure 3 2 Autoload Manual Load Selection LAST TURN OF TAPE 15 875 mm 6 35 mm 0 625 inch 0 250 inch MA 2654 Figure 3 3 Tape Content Limit When a tape cartridge is not used the autoload procedure is followed if the transport front door is closed When the front door is open the autoload procedure will still be used if the autoload interlock is pulled out Otherwise the manual procedure must be followed 3 2 3 Autoload 1 Check the tape path for cleanliness Refer to Paragraph 4 3 4 for cleaning procedure 2 Check that the tape reel is a large 267 mm 10 1 2 in reel and that it has a full reel of tape 3 Check that end of tape has a clean edge and is not bent torn or frayed If necessary trim the end with the tape crimper P N 47 00038 NOTE Do not crimp the tape unnecessarily Each crimping shortens the tape leader and could eventually lead to failures in the autoload sequence 4 Check that static charge is not causing end of tape to stick to reel End of tape must be free of reel to accomplish autoload 5 Ifa write operation is to be performed install write enable ring onto the rear flange of the tape reel 6 Place the supply reel in position on the upper hub rotate until it slips easily into place and press t
28. aintain optimum tension on the tape between the supply and the take up reels The supply reel and take up reel servos are similar but separate subsystems The path followed by the tape in either direction between the supply reel and take up reel contains two tape loops in the buffer box supply loop and take up loop Each 1 10 loop is separately formed and maintained by a vacuum in conjunction with automatically controlled reel motor speeds In effect the reel servos function to feed tape into and remove tape from the buffer box at the rate required to maintain the correct loops Servo operation is initiated by signals developed within the pneumatic subsystem The subsystem senses that the tape loop position has changed as a result of forward or reverse tape motion Air is drawn from the closed ends of the two buffer boxes creating a vacuum causing the tape loop to form in each box The differential between the positive pressure inside the loop and the relatively negative pressure at the closed end of the buffer box outside the loop maintains the proper tension on the tape during the tape loaded state A separate chamber is located behind each buffer box and is connected to its respective box by a series of holes The spacing and arrangement of these holes is such that if the loop becomes larger more of the holes will be exposed to the positive pressure inside the loop and fewer will be exposed to the lower pressure area outside the loop This
29. al load repeatability test check the tape for damage caused by the tape transport The tape should not show damage that would cause a load failure or data errors Autoload Repeatability Mount a large 267 mm 10 1 2 in reel of tape onto the supply hub Check that the leader has no creases or rips If necessary cut the end of the tape with the tape crimper Close the transport door Initiate an autoload by pressing and releasing the LOAD REW button If the tape loaded successfully press the UNLOAD button to unload the tape If the autoload fails the tape will automatically try to load a second time If the second attempt fails the load fault lamp will flash on and off This is counted as one failure 2 17 7 Repeat steps 4 5 and 6 to attempt nine autoloads If a failure occurs within the nine tries continue autoloading up to twenty tries There should be no more than two failures among the twenty successive tries 8 After completing the autoload repeatability test check the tape for damage caused by the tape transport The tape should not show damage that would cause a load failure or data errors 2 5 2 TM03 TU77 Diagnostics Install a write enable ring on a large 267 mm 10 1 2 in reel of tape Mount the reel onto the supply hub Close the transport front door to close the autoload interlock or pull out the interlock switch to override Press the LOAD REW button to load the tape Press the ON LINE button and check that the on lin
30. arts lists of TU77 1 5 MECHANICAL AND ELECTRICAL SPECIFICATIONS Table 1 2 details the mechanical and electrical specifications of the transport Table 1 2 Mechanical and Electrical Specifications Item Tape computer grade Width Thickness Tape tension Reel diameter Autoload Recording modes Magnetic head Tape speed Instantaneous speed variation Long term speed variation Rewind time for 731 5 m 2400 ft Tape cleaner Interchannel displacement Read Write NRZI Write PE Start time Stop time Start distance Stop distance Beginning of tape BOT and end of tape EOT Detectors Note 4 Tape creepage Pneumatic interlock Load time Unload time Write gap to read gap distance Weight Cabinet dimensions Height Width Depth from face of front door to rear of cabinet Easy Load 1 and 2 are Registered Trademarks of IBM Specification 12 6492 0 0508 mm 0 498 0 002 in 0 0381 mm 1 5 mil 2 224 0 139 Newtons 8 0 oz nominal 266 7 mm 10 5 in maximum Note 1 and easy load cartridge 1 and 2 1600 BPI PE 800 BPI NRZI Dual stack with erase head 3 2 m s 125 ips 3 percent 1 percent 65 seconds nominal with 80 seconds maximum Dual blade type connected to vacuum supply 3 81 um 150 win maximum Note 2 5 72 um 225 uin maximum Note 3 11 43 um 450 uin maximum 3 0 0 3 ms 3 0 0 3 ms 4 216 0 508 mm 0 166 0 02 in 4 953 0 508 mm 0 195 0 02 in Photoelectric N
31. at with the environ ment and degree of use of the transport Therefore a rigid schedule applying to all machines is difficult to define Daily cleaning is recommended for units in constant operation in ordinary environments This schedule should be modified if experience shows other periods are more suitable Paragraph 4 3 4 contains the cleaning instructions Before performing any cleaning operation remove the file reel and store it properly All items in the tape path should be cleaned on a daily basis In cleaning it is important to be thorough yet gentle and to avoid certain dangerous practices It should be remembered that some tape cleaners are strong cleaning agents and should not come in contact with painted surfaces or plastic CAUTION Do not use acetone or lacquer thinner rubbing alcohol or exces sive cleaner Be extremely careful not to allow the cleaner to penetrate ball bearings and motors 4 3 3 Magnetic Tape Transport Cleaning Kit A magnetic tape transport cleaning kit TUCOI has been carefully configured to provide cleaning materials that will not harm tape equipment and will not leave any residue behind to interfere with data reliability The hints contained in the following few paragraphs will ensure that the very best results possible will be obtained from the kit The Freon TF113 cleaning fluid in this kit is one of the safest and best degreasing agents available It will not adversely affect any part of DIGITAL s ta
32. aterial 6 Operation above 1220 m 4000 ft requires installation of high altitude pulley and pulley belts in TU77 power pack 7 Line variations must be within 10 percent 8 Slave unit only Add 625 W for master units CHAPTER 2 INSTALLATION 2 1 SITE PLANNING AND CONSIDERATIONS 2 1 1 Space Requirements Figure 2 1 illustrates the space and service clearances required for the TU77 cabinet Adequate space must be provided to slide the out of the cabinet for servicing and to open the front and rear doors on the TU77 Tape Transport 2 1 2 Power Requirements The TU77 Tape Transport can be operated from 200 250 Vac 50 60 Hz with proper connections on the power chassis Line voltage should be maintained to within 10 percent of the nominal value and the frequency should not vary more than 2 Hz REAR DOOR 64 1 cm 25 1 4 in 144 8 cm 57 in 76 2cm 30 in REMOVABLE SIDE PANEL LEVELER 4 PLACES MA 2641 Figure 2 1 Space and Service Clearance Top View 2 1 2 1 3 Environmental Requirements The TU77 transport should be located in an area free of excessive dust and dirt or corrosive fumes and vapors To ensure proper cooling the bottom of the cabinet and the air vents in the front panel and rear door of the cabinet must not be obstructed The operating environment should have cool well filtered humidified air a temperature range of 15 to 27 C 59 to 80 F and relative humidity of 40 to 60
33. ation 2 Street Til e z x OY Company State Country Department _ Additional copies of this document are available from Digital Equipment Corporation 444 Whitney Street Northboro Ma 01532 Attention Communications Services NR2 M15 Customer Services Section Order No EK TU77 UG 001 di gli tall No Postage Necessary if Mailed in the United States BUSINESS REPLY MAIL FIRST CLASS PERMIT NO 33 MAYNARD MA POSTAGE WILL BE PAID BY ADDRESSEE Communications Development and Publishing 129 Parker Street PK3 Maynard Massachusetts 01754
34. ceed as follows 1 10 11 12 An array of vertical slots constitute venting in the cabinet front panel A quick release latch is located approx imately 2 54 cm 1 in behind each end of this array Insert a thin bladed tool such as a small steel rule into one of the end slots and push on the latch while simultaneously pulling forward to release one corner of the front panel In the same manner while continuing to pull forward release the latch at the other end of the array to free the front panel Remove the front panel and set it aside Do not disconnect the ground strap from the panel Remove the two leveler pads and four leveler feet that are wrapped in blister wrap and taped to the inside of the front panel Raise the interlock rods on each side of the cabinet Remove the two stabilizer arms from the stabilizer sleeve assemblies Figure 2 3 Screw the leveler pads into the stabilizer arms Raise the interlock rods Reinsert the stabilizer arms into the stabilizer sleeve assemblies Install the leveler feet in the lower corners of the cabinet frame Figure 2 3 Using a 1 43 cm 9 16 in wrench lower the leveling feet until they make contact with the floor stabilizing the cabinet Using a level adjust the feet until the cabinet is level Extend the two stabilizer arms and lower the leveler pads until they just touch the floor yet can easily slide along the floor Do not place any weight on the leveler pads Insert an
35. e light is on Table 2 3 lists the TM03 TU77 diagnostics for PDP 11 DECsystem 20 and PDP 11 780 VAX sys tem Run the following diagnostics that apply to the system used Use the instructions in the diagnostic documentation and check for the results specified in Paragraphs 2 5 2 1 through 2 5 2 5 Title Control Logic Test 1 Control Logic Test 2 Basic Function Test Drive Function Timer Data Reliability Table 2 3 TM03 TUT7 Diagnostics Used for Acceptance Testing MAINDEC 11 DZTEA 1 MAINDEC 11 DZTEB f MAINDEC 11 DZTEC f MAINDEC 11 DZTEE t MAINDEC 11 DZTED f Number DECsystem 20 PDP 11 780 VAX MAINDEC 10 4 ZZ ESMAB MAINDEC ZZ ESMAA 10 DFTUK f Additional TM03 TU77 diagnostics are available for maintenance t Revision B Rev 2 or higher Revision F Rev 6 or higher 2 18 Description Test TMO3 logic In cludes control and data logic in maintenance modes wrap 0 through 3 Indicates probable faulty area Tests TMO3 logic In cludes control and data logic in maintenance mode wrap 4 Indicates probable faulty area Tests the subsystem command functions read write space etc Tests for proper tape motion timing speed acceleration deceler ation and data transfer rate Tests TM03 and TU77 circuitry by writing and reading user determined or predetermined data patterns and recording modes Provides error information to the user via the console
36. emblies 2 P N 29 23236 Write protect assembly P N 29 23235 Vacuum valve assembly P N 29 23248 Pressure switches vacuum 2 P N 29 23238 29 23239 Pack sense assembly P N 29 23217 Capstan motor assembly P N 29 23234 Service lock Preamp printed circuit board PCB P N 29 23232 Vacuum transducer assembly P N 29 23246 Pressure switch column limit P N 29 23238 1 5 EXHAUST FANS 2 NY o p a DATA L PCB 2 I CONTROL PCB 2 L m z oum GABAA E ME udi D AY WRITE PCB a th gy SS L lt 4 SS ts CAPSTAN SERVO Y LA PCB 7 PAA lt 7 REEL SERVO PCB BLOWER MOTOR MA 2644 Figure 1 4 Card Cage Area Figure 1 4 illustrates the card cage area containing the following items Magtape adapter MTA M8940 PCB P N M8940 Data L PCB 29 23227 Write PCB P N 29 23226 Control M PCB P N 29 23229 Capstan regulator PCB P N 29 23230 Reel servo PCB P N 29 23231 Blower motor P N 70 14569 Exhaust fans 2 P N 12 10930 Interconnect D1 PCB interconnecting backplane not shown in Figure 1 4 29 23211 COMPRESSOR RECTIFIERS 3 Ss e e TRANSFORMER G MOTOR BRA M gt f IL QoS A FUSE PANEL POWER TRANSFORMER AIR FILTER TERMINAL STRIP UNDER COVER 0
37. en override the interlock by pulling it out Follow the instructions and check for the events specified in Figure 2 17 2 14 e c PRESS RESET BUTTON PRESS LOAD REW BUTTON file protect LAMP GOES OFF AC MOTOR STARTS CARTRIDGE MOTOR OPENS TAKE UP REEL TURNS CW NO SUPPLY REEL MOTION SUPPLY REEL TURNS CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE SUPPLY REEL TURNS CW THREADS AND WRAPS ONTO THE TAKE UP REEL YES bot LAMP FLASHES ONCE T YES 20 TAKE UP REEL COMPLETES ABOUT TEN REVOLUTIONS SUPPLY REEL STOPS PRESSURE AND VACUUM SOLENOIDS DE ENERGIZE SUPPLY REEL TURNS CCW PRESSURE AND VACUUM SOLENOIDS ENERGIZE SUPPLY REEL TURNS CW THREADS AND WRAPS ONTO THE TAKE UP REEL YES NO PRESSURE AND VACUUM SOLENOIDS DE ENERGIZE TAPE ENTERS VACUUM COLUMNS LOOPS ARE SET TO BOT AND STOPS NO bot LIGHT COMES TAPE HAS A BOT MARKER NO YES BO MARKER HAS PASSED BOT SENSOR AND IS ON THE TAKE UP NO REPEAT THE AUTO LOAD PROCEDURE WITH ANOTHER REEL OF TAPE IF THE LOAD SEQUENCE IS STILL UNSUCCESSFUL RE FER TO TROUBLE SHOOTING PROCEDURES IN CHAPTER 6 OF THE TECHNICAL MANUAL Figure 2 17 Autoload Sequence INSTALL A BOT MARKER 4 6M 15 FT FROM THE BEGINNING OF THE TAPE REPEAT THE AUTOLOAD PRO CEDURE BOT MARKER IS TOO FAR FROM BEGINNI
38. from 861 switched outlet to cabinet blowers c Power cable from 861 switched outlet to H740 DA power supply d H740 DA power cabling to TMO3 e TM03 cabling to Massbus connector panel f TMO3 cabling to the three connectors on the M8940 MTA board 2 Check that the power on off circuit breaker on the 861 is on and the remote local switch is set to REMOTE ON Figure 2 7 See TM03 User s Manual or TM03 Technical Manual for cabling The TM03 manuals are listed in Table 1 1 2 5 REMOTE SWITCHING REMOTE LOCAL BUS JACK 3 SWITCH X SWITCHED POWER CONTROL 8618 REMOTE LOCAL UNSWITCHED D INPUT 240 50 60 HZ ON OFF ON 2 POLE 3 WIRE 16A POWER AVAILABLE POWER ON OFF INDICATORS 2 CIRCUIT BREAKER 2660 Figure 2 7 861 Power Control Panel 3 Check fuses on power pack fuse panel Figure 1 5 To see fuses it is necessary to fully extend the TMO3 shelf The fuses can be seen from the front of the cabinet A closer view can be obtained from the rear of the cabinet by looking over and down onto the fuse panel 4 Remove the cover from the power transformer terminal strip Figure 2 8 The ac input plug on the power pack must also be removed Check that the blue brown and white red wires are connected to the lower terminals as shown in Table 2 1 The terminals are numbered 1 through 9 from left to right Table 2 1 Primary Power Connections Brown Wire and White
39. gure 2 8 and check that the ac motor pulley is the proper one for the source frequency and altitude as shown in Table 2 2 The variation of the vendor part number is stamped on the pulley Spin the ac motor pulley by hand and check that the blower and com pressor belts are tight and track properly Replace the pulley cover 7 Connect the BCO6S round Massbus cable to the in connector on the rear of the master TU77 Figure 2 9 8 If the system has only one master TU77 connect a Massbus terminator into the out receptacle of the master unit If the system contains another master TU77 connect them together in daisy chain fashion by connecting another BC06S Massbus cable from the out receptacle of the first TU77 master to the in receptacle of the second If there are more master units in the system connect them onto the daisy chain in a similar manner Install a Massbus terminator into the out receptacle of the last master unit on the chain 9 Daisy chain the slave TU77s interfaced to a particular by connecting three slave bus cables from the M8940 MTA board in the master unit to the M8940 MTA board in the first slave unit and so on up toa maximum of three slave units four transports to one tape formatter If the system contains more than three slave units a second TU77 master unit is required The slave bus cabling is illustrated in Figure 2 12 The orientation of the slave bus to the MTA boards is colored stripes on the left with
40. he reel retaining actuator The reel should be positioned in such a way that the tape will unwind if the reel is turned clockwise NOTE The supply reel may be contained in an easy load wraparound cartridge It is not necessary to remove or open the cartridge The cartridge will be opened automatically during the autoload sequence Registered trademark IBM Inc 7 Carefully close the buffer door making sure the door is closed securely 8 Close the transport front door NOTE If a wraparound cartridge is not used the transpart front door must be shut to close the autoload interlock and enable the auto load sequence If it is desired to leave the door open override the interlock by pulling the switch out 9 Check that power is applied to the tape transport power light on 10 Follow the instructions and check for the events specified in Figure 3 4 If the tape fails to load properly the figure contains some operator troubleshooting hints that can be tried before maintenance personnel are called Refer to Figure 3 5 to identify tape path components 3 2 4 Manual Load 1 Check the tape path for cleanliness Refer to Paragraph 4 3 4 for cleaning procedure 2 Ifa write operation is to be performed install a write enable ring onto the rear flange of the tape reel 3 Place the supply reel in position on the upper hub rotate until it slips easily into place and press the reel retaining actuator The reel should be positioned in
41. his manner provides good horizontal alignment After all the cabinets have been bolted together readjust the leveler pads on the stabilizer arms until each pad touches yet easily slides along the floor Do not place any weight on the leveler pads Install the four mounting bolts taken from the master cabinet into the mounting bolt plates of the end slave transport Remove front panel trim if necessary Open the base assembly of the end slave transport Release the top cover fastener remove the cover and rest it on top of the cabinet off to one side Do not disconnect the cover ground strap Set the side panel taken from the master transport next to the slave transport Connect the panel ground strap to the cabinet frame and mount the panel onto the side of the slave transport Replace the top cover and secure the cover fastener Unlock the rear door of the master transport using the opening tool provided for that purpose Figure 2 4 Insert the tool and turn one quarter turn in a counter clockwise direction Remove the locking pins from the rear of the TMO3 shelf slide assembly of the master TU77 cabinet Figure 2 5 Open the base assembly of each transport and remove the PCB shipping bracket by pushing in on the lower front and pulling down from underneath Figure 2 6 Check seating of PCBs in their sockets 2 4 2 Power and Cabling Perform the following steps for each of the TU77 cabinets unless otherwise specified 1 Check
42. l forward release the remaining latch at the other end of the array to free the front panel Remove the front panel and set it aside Do not disconnect the ground strap from the front panel Two leveler pads and four leveler feet are blister wrapped and taped to the inside of the front panel Remove the leveler pads and feet Raise the interlock rods on each side of the cabinet and remove the two stabilizer arms from the stabilizer sleeve assemblies Figure 2 3 Screw the leveler pads into the stabilizer arms Raise the interlock rods and reinsert the stabilizer arms into the stabilizer sleeve assemblies Install the leveler feet in the lower corners of the cabinet frame Figure 2 3 Extend the two stabilizer arms from each cabinet and lower the leveler pads until they just touch the floor Do not place any weight on the leveler pads The pads will be readjusted later Open the master transport front door Using a screwdriver release the service lock located in the lower right corner of the base assembly Swing the base assembly open NOTE The base assembly will not swing open unless the stabilizer arms are extended step 7 Locate the fastener attached to the underside of the master transport top cover Figure 2 10 Release the top cover by turning the fastener one quarter turn in a counter clockwise direction When it is released the fastener hangs by a wire from the top cover Pull the top cover forward approximately 1 27 cm 0 5 i
43. mm 8 1 2 or 7 in reel of tape and mount the reel onto the supply hub Check that the leader has no creases or rips If necessary cut the end of the tape with the tape crimper Insert 8 to 10 cm 3 to 4 in of tape into the threadblock column Follow the instructions and check for the events specified in Figure 2 18 2 5 1 6 Unload Sequence Follow the instructions and check for the events specified in Figure 2 19 2 5 1 7 Manual Load Repeatability 1 Mount a 216 178 mm 8 1 2 or 7 in reel of tape onto the supply hub 2 Check that the leader has no creases or rips If necessary cut the end of the tape with the tape crimper 3 Insert 8 to 10 cm 3 to 4 in of tape into the threadblock column 2 16 2 5 1 8 PRESS RESET BUTTON PRESS UNLOAD BUTTON AC MOTOR STOPS SUPPLY REEL TURNS CCW TAKE UP REEL TURNS CW AND THEN CCW TAPE UNLOADS AND WRAPS ONTO SUPPLY REEL SUPPLY REEL STOPS CARTRIDGE MOTOR CLOSES TAKE UP REEL STOPS file protect LAMP COMES ON MA 2652 Figure 2 19 Unload Sequence Initiate a manual load by pressing and releasing the LOAD REW button If the tape loaded successfully press the UNLOAD button to unload the tape Repeat steps 3 4 and 5 to attempt eight manual loads If a failure occurs within the eight tries continue manual loading up to twenty tries There should be no more than three failures among the twenty successive tries After completing the manu
44. n and lift off Rest the cover on top of the cabinet leaving the ground wire connected 2 8 10 li 12 13 14 MA 2533 Figure 2 10 Top Cover Fastener MOUNTING BOLTS FRONT TRIM MOUNTING BOLTS MA 2661 Figure 2 11 Corporate Cabinet with Side Panels and Top Cover Removed Remove the end panel furthest from the CPU by grasping it by both sides and lifting it off the four mounting bolts If the side panel will not lift off it may be necessary to loosen the mounting bolts Remove the front panel trim to gain access to the upper front mounting bolt To remove the trim lift up and out Figure 2 11 Disconnect the side panel ground strap from the cabinet frame and set the panel aside Remove the four exposed mounting bolts from the master transport Push the cabinets together so they are in adjoining positions with the mounting bolt plates side by side Using a 1 43 cm 9 16 in wrench lower the leveling feet of the highest cabinet until they make contact with the floor giving the cabinet a firm base 2 9 17 18 20 21 22 23 24 25 Using a level adjust the feet until the cabinet is level Level and adjust the adjoining cabinet s so that the bolting middle holes on the four corner bolting plates are aligned After aligning the bolting holes of adjoining cabinets insert 1 4 in bolts into the holes and secure them with kepnuts Bolting the cabinets in t
45. one Tape motion disabled when vacuum is lost in vacuum column No greater than 10 seconds without a retry and 20 seconds with a retry for 10 1 2 inch reels Less than 7 seconds for 10 1 2 inch reels 0 381 0 013 cm 0 150 0 005 in 288 kg 640 Ibs Master unit 152 4 cm 60 0 in 67 3 cm 26 5 in 81 9 cm 32 3 in Table 1 2 Mechanical and Electrical Specifications Cont Item Specification 4 44 to 44 0 C 40 to 112 F Note 5 45 55 to 71 11 C 50 to 160 F Operating temperature Electronics Non operating temperature Operating altitude 0 to 2134 m 0 to 7000 ft Note 6 Non operating altitude 15 240 m 50 000 ft maximum Power Volts ac 200 210 220 230 240 250 Note 7 Frequency 50 1 or 60 1 Hz Kilovolt amp KVA Standby Loaded 1 3 maximum Note 8 Start stop 2 1 KVA maximum Note 8 Electronics All silicon NOTES l 177 8 mm 7 in and 216 0 8 5 in reels may be used but cannot be autoloaded 2 The maximum displacement between any two bits of a character when reading a master tape using the read section of the read after write head 3 The maximum displacement between any two bits of a character tape written with all ones using the write section of the read after write head 4 Approximate distance from detection area to write head gap is 35 6 mm 1 40 in 5 For data transfer the operating temperature is dictated by the nature of the tape m
46. ont and rear view of the base assembly identifying components within the assembly These are Control assembly 29 23214 Reel sense assembly P N 29 23216 Autoload interlock switch P N 29 23297 Reel hub assembly P N 29 22776 Buffer box door assembly P N 29 23215 Tape in path TIP assembly P N 29 23243 EOT BOT assembly 29 23242 Head P N 29 23233 Cartridge interlock switch P N 29 16280 Upper restraint P N 29 23225 Lower restraint P N 29 23224 1 4 PRESSURE SWITCH PRESSURE VALVE INTERCONNECT 1 PNEUMATIC INTERLOCK ASSEMBLY PCB N PARA BB CR e lt ND y 2 021110 REEL MOTOR ASSEMBLY SUPPLY REEL PRESSURE SWITCH COLUMN LIMIT WRITE PROTECT ASSEMBLY CARTRIDGE MOTOR PRESSURE SWITCH 2 VACUUM VACUUM TRANSDUCER ASSEMBLY lt VACUUM VALVE T OU SAW Z2 ASSEMBLY PREAMP PCB E S w E A S 2 AY VSN EN J Z A SERVICE fc LOCK A D M RSS SS CAPSTAN MOTOR PACK SENSE ASSEMBLY REEL MOTOR ASSEMBLY ASSEMBLY NOT SHOWN TAKE UP REEL b Rear View Figure 1 3 Base Assembly Cartridge motor P N 29 23280 Pressure switch Pneumatic interlock P N 29 23240 Pressure valve assembly P N 29 23249 Interconnect F1 printed circuit board PCB P N 29 23213 Reel motor ass
47. ort will go off line and the on line light will go out Also the transport automatically reverts to the off line mode if any of the following occur An external rewind unload command is received Vacuum column interlock is broken AC power 15 lost RESET button is pressed 3 8 4 1 4 2 CHAPTER 4 CUSTOMER CARE AND PREVENTIVE MAINTENANCE CUSTOMER RESPONSIBILITIES The customer is directly responsible for l Obtaining operating supplies including magnetic tape and cleaning supplies Supplying accessories including cabinetry tables and chairs Maintaining the required logs and report files consistently and accurately Making the necessary documentation available in a location convenient to the system Keeping the exterior of the system and the surrounding area clean Ensuring that ac plugs are securely plugged in each time equipment is used Performing specific equipment care operations described in Paragraph 4 2 and 4 3 at the suggested frequencies or more often if usage and environment warrant CARE OF MAGNETIC Do not expose magnetic tape to excessive heat or dust Most tape read errors are caused by dust or dirt on the read head it is imperative that the tape be kept clean Always store tape reels inside containers when not in use keep the empty containers tightly closed to keep out dust and dirt Never touch the portion of tape between the BOT and EOT markers oil from fingers attracts dust and dirt Ne
48. pe equipment To ready the can of fluid for service unscrew the top and punch a small hole in the metal seal covering the pour spout WARNING TF113 is a non restricted non hazardous substance However when using TF113 avoid excessive skin contact do not allow TF113 to come in contact with the eyes and do not swallow it Use TF113 only in a well ventilated area When cleaning tape equipment never dip a contaminated cleaning swab or wipe into the can To transfer fluid onto the swab pour a little into the screw cap and dip the swab into the cap Discard the remaining fluid when the cleaning operation is complete Always keep the can of fluid tightly closed when not in use because Freon TF113 evaporates rapidly when exposed to air Trademark of Dow Chemical Company 4 2 AIR BEARING THREAD BLOCK AIR BEARING 4 AIR BEARING 5 AND SPRING LOADED TAPE GUIDE THREAD BLOCKS AIR BEARING NO 1 AIR BEARING NO 2 Z Y A TAKE UP 21 THREAD BLOCK SUPPLY POCKET M TAPE CLEANER ERASE HEAD READAVRITE HEADS AIR BEARING NO 6 SPRINGLOADED VACUUM TAPE GUIDE CAPSTAN Tape Path Items Figure 4 1 Transport Items for Daily Cleaning Jus BOX ROI EM a PUCKER b Buffer Box Door D POCKET RN GLASS PART OF DOOR OVERLAY 2638 Use the cleaning materials
49. r count 20 Pattern number 1 Tape mark 1 Interchange read 0 Single pass 1 Stalls Read 1 Write 1 Turnaround 1 Revision B or higher 2 19 Before typing the last CR set the console switches to 000720 Then type CR to run the test The following errors are allowed hard errors read and write 4 soft write errors 2 soft read errors DECsystem 20 Using 10 DFTUK 1 Run NRZI test R8 for one pass The following errors are allowed hard errors read and write 3 soft write errors 1 soft read errors 2 Run PE test R1 for one pass The following errors are allowed O hard errors read and write 3 soft write error 1 soft read error 3 Set left hand switches to 400010 Run the NRZI IW test for one pass with the following parameters entered on the terminal Density 800 Close skew window CR Data compare mask CR SYSERR recording N Fast mode Y or N Y Verify tapes N The following errors are allowed hard write errors 1 soft write error Run the NRZI IR test for one pass The following errors are allowed read errors hard or soft 4 With the left hand switches still set to 400010 run the PE IW test for one pass with the following parameters entered on the terminal Density CR or 1600 Close skew window CR Data compare mask CR SYSERR recording N Fast mode Y or N Y Verify tapes N The following errors are allowed hard write errors 1 soft write error
50. run in the reverse direction to BOT 3 With tape in path and tensioned and the transport off line the tape rewinds to BOT If the tape is already at BOT or if the transport is on line no action occurs ON LINE Pressing and releasing the ON LINE button will change the transport from off line to on line Pressing and releasing the button again will change the transport from on line to off line UNLOAD If the TU77 is off line pressing and releasing the UNLOAD button causes the tape to rewind and unload If the tape is already at BOT it will unload If the TU77 is on line the UNLOAD button has no effect RESET Pressing and releasing the RESET button terminates all functions and clears a load fault 3 1 Table 3 2 TU77 Indicators Indicator Function power Indicates presence of dc and secondary ac power bot Indicates tape is at BOT on line Indicates the TU77 is on line The transport will revert to the off line mode if any of the following occur 1 ON LINE button is pressed 2 An external rewind unload command is received 3 Vacuum column interlock is broken 4 AC power is lost 5 RESET button is pressed file protect Indicates that a reel of tape without a write enable ring has been loaded onto the transport load fault Lamp flashes when a load fault has occurred i e 1 When the autoload sequence has failed to load a tape from 267 mm 10 1 2 in reel after two trys 2 When a load sequence has failed
51. sher is pressed firmly against the tape guide surface and not hung up on its shaft When cleaning the inner surface of the vacuum door use a lint free wipe and cleaning fluid Pass another lint free wipe over the head using a polishing action to remove any remaining deposits 4 4 BPI CPU CRC DIP EOT IPS IRWU LRC MTA NRZI PCB PE REW SB TIP WLO Beginning of Tape Bits per Inch Central Processor Unit Cyclic Redundancy Check Dual In Line Package End of Tape Inches per Second Interface Rewind Unload Longitudinal Redundancy Check Magnetic Tape Adapter Non Return to Zero Inverted Printed Circuit Board Phase Encoded Rewind Slave Bus Tape in Path Write Lockout APPENDIX A GLOSSARY TU77 MAGNETIC TAPE TRANSPORT USER S GUIDE Reader s Comments EK TU77 UG 001 Your comments and suggestions will help us in our continuous effort to improve the quality and usefulness of our publications What is your general reaction to this manual In your judgment is it complete accurate well organized well written etc 15 it easy to use What features are most useful What faults or errors have you found in the manual Does this manual satisfy the need you think it was intended to satisfy Does it satisfy your needs __ Why L Please send me the current copy of the Technical Documentation Catalog which contains information on the remainder of DIGITAL s technical document
52. such a way that the tape will unwind if the reel is turned clockwise 4 Manually place the tape leader between thread block no 1 and air bearing no 1 Figure 3 5 NOTE Ensure that there is no tape slack or sag between the supply reel and thread block no 1 5 Carefully close the buffer door making sure the door is closed securely 6 Ifa216 or 178 mm 8 1 2 or 7 in reel is being loaded close the transport front door If a 267 mm 10 1 2 in reel is being loaded leave the transport door 1 7 Check that power is applied to the tape transport power light is 8 Follow the instructions and check for the events specified in Figure 3 6 If the tape fails to load properly the figure contains some operator troubleshooting hints that can be tried before maintenance personnel are called Refer to Figure 3 5 to identify tape path components tThis disables the autoload sequence that would normally occur with 267 mm reel 3 4 PRESS LOAD REW BUTTON PRESS RESET BUTTON CARTRIDGE IF ANY WILL OPEN TAKE UP REEL WILL START TOTURN CW SUPPLY REEL WILL TURN BACKWARDS CCW A FEW TURNS AND THEN ROTATE FORWARD CW AND EJECT TAPE INTO THE TAPE PATH TAKE UP REEL bot LIGHT FLASHES ONCE TAPE HAS A BOT MARKER TAPE ENTERS VACUUM COLUMNS AND LOOPS ARE SET INSTALL A BOT MARKER 4 6 M 15 FT FROM THE BEGINNING OF THE TAPE REPEAT THE AUTOLOAD PROCEDURE
53. t only The diag nostics treat the and the transport as a subsystem Instructions on how to run these diagnostics and interpret the results are given in this section If unfamiliar with interlocks and other conditions affecting autoload manual load selection refer to Paragraph 3 2 2 c Tc LAST SLAVE TU77 FIRST SLAVE TU77 MASTER TU77 ENTE 81 RESISTIVE DIP PACK TERMINATORS 5 IN STALL ONLY ON LAST SLAVE IN DAISY CHAIN TAPE FORMATTER Figure 2 12 Slave Bus Cabling of TU77 Daisy Chain Jig SOCKETS FOR FIVE RESISTIVE DIP PACK BCOG6R CABLES IN TERMINATORS 13 11003 01 SMOOTH SIDE UP COLORED STRIPE BCO6R CABLES OUT RIBBED SIDE 1473 UP Figure 2 13 Cable Orientation on M8940 MTA Module 2 5 1 Turn On and Loading Checkout The turn on and loading checkout consists of loading the transport under various conditions and checking that the proper responses are obtained The checkout utilizes flowcharts to show the proper sequence of events for each of the loading operations Actions listed inside a flowchart box occur at about the same time while actions listed in separate boxes occur in sequence The flowcharts include minor troubleshooting to aid in locating simple problems caused by bad tape or improper loading procedures Perform the following operations in order 2 5 1 1 Power On Follow the instructions and check for the events specified in Figure 2 14 TURN ON POWER FANS COME O
54. the remote local switch 10 Replace the front panel Close the rear door 1l Check that system power is off at the CPU and connect the ac power cable from the 861 to the power source I2 Perform the acceptance tests Paragraph 2 5 MULTI TRANSPORT INSTALLATION 2 4 1 Mechanical Installation When an installation contains more than one transport only the master transport is shipped with the side panels During installation one of the side panels is removed and the master and slave trans port s are bolted together The removed side panel is then mounted onto the end slave transport 2 7 5 ROUND MASSBUS CABLE IN MASSBUS TERMINATOR 70 09938 INSTALLED IN OUT RECEPTACLE BCO6R CABLES TO TMO3 MA 2646 Figure 2 9 Massbus Connection to TU77 Master Transport After the shipping containers have been removed and the transports have been visually inspected roll the transport cabinets into their approximate position Place the master transport next to the CPU Proceed as follows for each cabinet unless otherwise specified l An array of vertical slots constitute venting in the cabinet front panel A quick release latch is located approx imately 2 54 cm 1 in behind each end of this array Insert a thin bladed tool such as a small steel rule into one of the end slots and push on the latch while simultaneously pulling forward to release one corner of the front panel In the same manner while continuing to pul
55. the read heads and translates the information from the recorded NRZI or PE format to digital data acceptable to the external controlling circuits The func tion includes the read after write capability that permits the formatter to verify the execution of a write command while writing is in progress The write function prepares incoming data for recording in NRZI or PE format and writes the information on the tape in the selected format The control logic and manual control circuit interfaces other TU77 subsystems The control logic transfers the read write data to and from the read write subsystem and the operational commands to the capstan servo During the autoload sequence the logic circuits control the steps of the sequence by issuing the appropriate commands to the reel servos Timing of the autoload sequence steps and other operational sequences such as rewind is controlled and monitored by the control logic Commands generated by the manual controls are processed by the control logic and applied to the appropriate subsystem Transport status e g transport selected on line EOT BOT etc is sensed by the control logic which modifies the signals to the read write subsystem and to the servo subsystems accordingly The logic illuminates the appropriate control panel indicators to indicate transport status Transport status is sent to the TMO3 tape formatter via the MTA interface module The control and read write signals are coupled from
56. the slave bus to the transport via the magnetic tape adapter MTA interface module M8940 The M8940 adapts the signals on the slave bus to the format required by the transport and vice versa This includes signal gating latching and timing The M8940 also has a test mode capability for troubleshooting and maintenance The power supply function includes ac rectification filtering dc regulation and distribution of power as required to the various subsystems 1 4 APPLICABLE DOCUMENTS Table 1 1 lists documents applicable to the TU77 tape transport Table 1 1 Applicable Documents Document Number Description EK TM03 OP TMO03 Magnetic Tape Formatter User s Manual Description programming and installation information of the TMO3 TMO03 Magnetic Tape Formatter Mainte EK TM03 TM nance Manual Theory of operation programming infor mation installation and maintenance of the TMO3 H740 D Power Supply Maintenance DEC 11 H740A A D Manual Theory and maintenance of H740 DA power supply 861 A B C Power Controller DEC 00 H861A A A Theory and maintenance of 861 power con trol TU77 Magnetic Tape Transport Technical EK 1TU77 TM Manual Volume Schematics and logic prints of TU77 TU77 Magnetic Tape Transport Technical EK 2TU77 TM Manual Volume 2 Description installation operation theory and maintenance of TU77 TU77 Magnetic Tape Transport IPB EK TU77 IP Exploded views and p
57. the smooth side up for the in cables and colored stripes on the left with the ribbed side up for the out cables Figure 2 13 10 All M8940 MTA boards have five resistive dual in line package DIP pack terminators P N 13 11003 01 for terminating the slave bus Remove the terminators from all except the last M8940 board of each slave bus chain The location of the terminators are shown in Figures 2 12 and 2 13 11 Daisy chain the remote switching control bus by connecting the bus from the CPU to one of the three jacks next to the remote local switch on the 861 in the master TU77 Connect the bus from one of the two remaining jacks to the 861 in the next TU77 Continue the daisy chain until all the TU77s are connected to the remote switching control bus 12 Check that system power is off at the CPU and connect the ac power cable from each 861 to a power source 13 Install cabinet front panels and close and secure all base assemblies 14 Perform the acceptance tests Paragraph 2 5 2 5 ACCEPTANCE TESTING This section lists and describes all the tests required for acceptance testing of the TU77 transport and the TM03 tape formatter If the acceptance tests are performed satisfactorily then the TM03 and the TU77 have been installed and are operating properly Acceptance testing is divided into two categories a turn on and loading checkout and the system diagnostics The turn on and loading checkout checks basic functions of the transpor
58. to load tape from a 216 or 178 mm 8 1 2 or 7 in reels 800 Indicates the tape transport is set to read or write at 800 BPI NRZI mode Indicates the tape transport is set to read or write at 1600 BPI PE mode 3 2 OPERATING PROCEDURES 3 2 1 Power On Off Power is applied to the TU77 when the system CPU is turned on The 861 power control is remotely enabled from the CPU and applies ac power from the power source to the TU77 cabinet 3 2 2 Autoload Manual Load Selection Figure 3 2 illustrates various conditions and interlock settings that affect the selection of an autoload or manual load procedure When 216 178 mm 8 1 2 or 7 in reel is being loaded the manual procedure must be used If a 267 mm 10 1 2 in reel is used and the reel is in a cartridge the cartridge will engage the cartridge interlock which bypasses the autoload interlock and causes the autoload procedure to be used A prerequisite for an autoload sequence is that a full reel of tape be used The minimum quantity of tape to accomplish automatic loading is such that the outer turn of tape is between 1 59 and 0 64 cm 5 8 and 1 4 in from the outer edge of the reel as shown in Figure 3 3 Large 267 mm 10 1 2 in reels not containing sufficient tape to accomplish automatic loading must follow the manual load pro cedure 3 2 START 267 MM 10 in REEL NO YES TAPE REEL IN YES _ CARTRIDGE NO FRONT VER DOOR CLOSED IN
59. trates the basic system configuration for a TU77 The TMO3 tape formatter and its associated power supply H740 DA are housed in the TU77 cabinet H9500 corporate cabinet Those TU77s contain ing a TMO3 are designated as master units TU77s without the TMO3 are the units 1 2 PHYSICAL DESCRIPTION Figure 1 2 illustrates the locations of the major subassemblies of the TU77 These are TMO3 tape formatter master TU77 only H740 DA power supply master TU77 only 861 power control TU77 transport consisting of Base assembly Card Cage Area Power Pack Assembly The specific model of the H9500 cabinet series used for the TU77 is H9602KA however the cabinet is referred to as the H9500 in this manual 1 1 861 POWER CONTROL BASE ASSEMBLY TAPE FORMATTER POWER PACK ASSEMBLY MA 2786 a Front View Figure 1 2 TU77 Master Tape Transport 1 2 EXHAUST FANS 2 o BLOWER _ IlL e7 MOTOR PULLEY COVER H740 DA POWER SUPPLY MA 2648 b Rear View Figure 1 2 TU77 Master Tape Transport CARTRIDGE BUFFER BOX DOOR UPPER RESTRAINT INTERLOCK SWITCH ASSEMBLY REEL HUB ASSEMBLY REEL SENSE ASSEMBLY ASSEMBLY AUTOLOAD INTERLOCK SWITCH Tw bs LOWER RESTRAINT ASSEMBLY CONTROL ASSEMBLY MA 2636 a Front View Figure 1 3 Base Assembly Figure 1 3 is a fr
60. ulated 15 V and 5 Vdc operating voltage for the TMO3 Power fail signals AC LO and DC LO are also supplied to the TMO03 The 861 power control provides ac power to the transport cabinet It provides filtering for the ac input power which is supplied to switched outlets when the remote power on off line is enabled from the system processor via the remote switching control bus There is no power on off control on the TU77 control panel Transport power is turned on and off at the system processor The switched ac is supplied to the H740 DA power supply master TU77 only the three cabinet cooling fans and the transport power pack The basic TU77 transport contains seven functional areas as shown in Figure 1 7 These are Capstan servo subsystem Reel servo subsystem 2 Pneumatic subsystem Read write subsystem Control logic and manual controls MTA interface Power supply and distribution The capstan servo subsystem controls the speed and direction of tape movement past the read write heads The subsystem is a velocity servo that receives command signals from the control logic speci fying forward reverse or rewind motion The capstan motor responds with the appropriate velocity The capstan tachometer generates a feedback signal proportional to speed The feedback signal is summed with the basic command signal to maintain the correct capstan velocity at all times The reel servo subsystems control the speed of the tape reels as required to m
61. ver use a contaminated reel of tape this will spread dirt to clean tape reels and could have an adverse affect on tape transport reliability Always handle tape reels by the hub hole squeezing the reel flanges could lead to tape edge damage in winding or unwinding tapes Do not smoke near the tape transport or storage area tobacco smoke and ash are especially damaging to tapes Do not place magnetic tape near any lineprinter or other device that produces paper dust Do not place magnetic tape on top of the tape transport or in any other location where it might be affected by hot air Do not store magnetic tape in the vicinity of electric motors 4 1 43 CUSTOMER PREVENTIVE MAINTENANCE OF TU77 TAPE TRANSPORT 4 3 1 General Digital Equipment Corporation tape transports are highly reliable precision instruments that will provide years of trouble free performance when properly maintained A planned program of routine inspection and maintenance is essential for optimum performance and reliability The following infor mation will assist the customer in caring for his equipment and ensure the highest level of performance and reliability 4 3 2 Preventive Maintenance To ensure trouble free operation a preventive maintenance schedule should be kept Preventive main tenance consists of cleaning only a few items but the cleanliness of these items is very important to proper tape transport operation The frequency of performance will vary somewh

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