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Qume Trak 842 Service Manual

1. 2 Drive Selection RA AA 3 Signal Connector P1 J1 Pin AssignmentS 8 1 0 Signal Connector P1 Requirements for Flat Cable 9 Signal Connector P1 Requirements for Twisted Wire Pairs 9 DC Connector P5 J5 Pin Assignments 9 DC Connector P5 J5 Requirements 9 AC Connector 0 0 Pin Assignments 9 AC Connector Requirements 9 Installation Requirements 12 Factorty Configuration of the Option Traces 13 Programmable Shunt Trace Functions 15 Mutiplexed Drive Select Options 16 Side Select Options qe s 17 Maintenance Tools u ince Ai 19 Transducer Connector P2 J2 Pin Assignments 20 Head Connector P3 J3 Pin Assignments 20 Tost POMS iaa a AAA oa adde 20 Recommended Spare Parts Field Level 67 Recommended Spare Parts Depot Level 68 INTRODUCTION SCOPE This manual contains information describing the operation and maintenance of the QumeTrak 842 family of Flexible Disk Drives This first section of the manual describes the design features and specifications The INTERFACE section lists the physical interface connections of the QumeTra
2. 24 R W Head Read Amplitude Check 25 R W Head Azimuth 25 REMOVAL AND REPLACEMENT PROCEDURES 28 Printed Circuit Board 28 Spindle Drive Belt and Drive Pulley 28 Ball Assembly nara tae ING VAGA 28 Ball CIRCA AR CR Re 30 Drive Motor Assembly veces Gad x On OCDE EC 30 In DSe LED ada PE 31 Write Protect Sensor cie ia AAA e 32 Track 9 32 Index Sensor 33 Index LamD Assombly ae ane Ra X Rak Ede danse 33 Carrier 33 Pop up Assembly sues x eee tale AA ed OES E 35 Door LOCK SOIGNOIG x22 ii Me aao de decr acm 35 Front Bezel Assembly eleg Cy AAA Ea 36 Haad Load Solenolid ce add IR rq 37 Dust Cover and Wiper 38 Steel Belt u PC 39 Idler Assembly uu u oh er A D ana 41 Stepper Motor 41 Head Carriage Assembly 42 ADJUSTMENTS pa d uie SG X pa eee 44 Drive Motor Pulley Positioning
3. eT gt 1 Specifications and Reliability 2 WARRANTY SERVICE AND TRAINING 2 Warranty and Servi CO co cc oe pane Y ah Aem EAE 2 ede T ae ee eue 2 IN TERRACE ess wee ha Bee eae ee ED qs 3 ELECTRICAL INTERFACE os ee ccc ku E ERE ERR a gab aes 3 AA 3 VO Signal interface 3 s s a Aa 3 OUIDUCLINGS a u Ya S u a ACA 5 Alternate VO PINS iia es a RA la 6 PHYSIGALINTEHFAOE 0 e 8 Connectors and Gable etienne ddr 8 HO SIGnals cus ads 8 DG POWOL bos IES 9 AG nine een RM o 9 LORS 9 INSFALEATION gt gt A AS 11 RECEIVING 11 suy lu ECKE ARR NI ANO ate 11 MOUNTING Mechanical Dimensions 11 12 INSTALLATION REQUIREMENTS 12 CUSTOMER STRAPPABLE OPTIONS 13 GENERAL S psu de hau u io 13 INCORPORATION OF OPTIONS 15 Programmable 6 55555 15 Drive Select Options
4. 15 Head Load Options 16 Side Select 5 16 Radial Ready Option 17 Radial via essa RC a 17 ratas daa RC 17 OPTIONS 1 086 Door LOCK EBIChOptiOD cda 18 Write Protect Option 18 aa a 18 Disk Change 2 Sided Alternate Output 18 MAINTENANCE y EC CR CE XE ate 19 PREVENTIVE MAINTENANCE 19 PERIODIC CLEANING lt 2 2 4 EU ds DOCE KE 19 MAINTENANCE TOOLS 8 EQUIPMENT 19 INTERNAL CONNECTIONS 20 20 TESTPOINTS cota ws taret fuu ea T eta wh dco Wu We ICA RAT Table of Contents Continued PAGE SERVICE CHECKS aiti AAA 21 Index Lamp Assembly Service Check 21 Index Sensor Assembly Service Check m 21 Index Lamp and Sensor Alignment Check 21 Track 22 Sensor Assembly Service 22 Write Protect Sensor Assembly Service Check 22 In Use LED Service Check rss ia ree o RR 22 Head Load Solenoid Assembly Adjustment Check 23 Head Load Time
5. B128 A138 15 15 pw 5 630 RN12 29 Y DL DS PRESS dnb CD CR25 DC D B oc A 30 5 lue LU LC AN 22 R22 D CR21 chan e TERMINATOR eoo 23 6 amp Fe 1 6 LEA 0 1 851 1 R50 849 _ 4 0 C23 vrs VR4 622 Figure 52e Typical PCB Parts Location Diagram QumeTrak 842 81 DIAGRAMS 115V 50 60Hz 82 BK 2 0 250V Figure 52f Schematic Diagram Disk Drive Motor Circuit QumeTrak 842 008 A 056 APPENDIX QUMETRAK 842DC UNIQUE DATA The following product specifications data is applicable to the QumeTrak 842DC disk drive only This drive incorporates a DC drive motor eliminating the need for AC power at the unit Installation Requirements VOLTAGE _ RIPPLE _ CURRENT AMPS 24V 0 1 V TYP 4 0 10 MAX 5 8 5 V 0 05 V P P TYP 0 9 2 3 3 0 5 MAX 1 3 3 1 4 0 DC POWER REQUIREMENTS DC Connector P0 J0 Pin Assignments SIGNAL NAME 24VDC 24V RETURN 83 APPENDIX 50 HZ SYN MOTOR QumeTrak 842DC Disk Drive Motor Circuit Rime 5V 5V T an Le PF ALL CKTS 30 20M 20 DE Bree 50 HZ 107 RIS 6 4 7K 0 RIG 4 7K N 1 2 V y RIO 1 2W
6. 2 SIDED REPLACE INDEX LAMP OR SENSOR CHECK INDEX TIMING AT TP3 YES CHECK INDEX STATUS TEST PAD I YES CHECK RI RR R JUMPER STATUS IS JUMPER CONFIGUR O K CORRECT JUMPER CONFIGURATION YES REPLACE P C BOARD see Removal and Replacement Procedures see Service Checks Figure 45 Not Ready Troubleshooting Routine CHECK SPINDLE DRIVE BELT 15 SLIPPING CHECK SPINDLE PULLEY amp COLLET ASS IES FOR MECH BINDS REPLACE MECH SUB ASS IES AS REQUIRED PROBLEMS MAINTENANCE CHANGE TO RIGHT PULLEY REPLACE BELT REPLACE P C BOARD VERIFY READY see Removal and Replacement Procedures Figure 45 continued 55 MAINTENANCE PROCEED THRU NOT READY ROUTINE PROCEED THRU HEAD LOAD ROUTINE 56 PERFORM PREREQUISITE CHECKS INSERT DISK amp CLOSE DOOR SELECT DRIVE YES SELECT 810 LOAD HEADS ARE HEADS LOADED YES SEEK TO TRACK 20 IS NE STEPPER CHECK SIGNALS STEP J1 36 0 4V amp gt 3m SEC MOTOR RECEIVED FROM DIRECTION J1 34 2 2 4V STEPPING CONTROLLER L J1 14 gt 2 4V CHECK ARE CONTROLLER YES REPLACE DRIVE BOARD TRACK 0 IS MOTOR STEPPER MOTOR STEPPING 6 see Removal and Replacement Procedures
7. di 2 5 3 tou 3 5 TR 5 ee 59 84 88 3 22K i o 8 4 lt 9 o 5 o 9 6 3 3 6 3 5 o SH 1 05 g su 125 3 2 9 TRACK 60 SWITCH 3 5 w T gt 6 3 1 1 b 22K 470K 31 4 5 t I RNS 124 330 4 150 READY 5H 1 5 1 A INDEX Ji 22 READY es Jt 7 9 TWO SIDED PU su 1 Jt e e i2 DISK CHANGE READY I 50 3 4 TEDE SW sm 1 R pram B a 4 SCHE MA ric P 7 3 1752 5 50145 2 62 278 184 Jeungp welBe g 5 ozs Al 5 57 244 24VA 9 o t R14 100K T RN2 4 ALTERNATE 6 1 TM2 R sia 150 i 1 U4B 1 9 3 ET 1 Le m Fiolu4 pS PR SH 1 2 9 LOW CURRENT 2 JDE gt e q RN2 L1 BK O3N 1 1 AA vie CRIG CRI mm 5 O n 1 24 24 49 6 ME 6 Re VRI 2 RDGAM el s vo 47 sv q D 4VO CRS WRITE O su 4 33K WRITE DATA 3
8. Signal Connector P1 J1 Pin Assignments SIGNAL SIGNAL SIGNAL NAME PIN NO PIN NO STANDARD OPTION 3 5 7 4 6 8 ALTERNATE 1 2 LOW CURRENT 9 10 ALTERNATE TWO SIDED 11 12 ALTERNATE I O DISK CHANGE 13 14 SIDE SELECT ALTERNATE 15 16 ALTERNATE I O IN USE 17 18 ALTERNATE HEAD LOAD 20 19 INDEX 21 22 READY 23 24 ALTERNATE I O 25 26 DRIVE SELECT 1 27 28 DRIVE SELECT 2 29 30 DRIVE SELECT 3 31 32 DRIVE SELECT 4 DIRECTION STEP 33 34 35 36 37 38 WRITE DATA 39 40 WRITE GATE 41 42 00 WRITE PROTECT 43 44 45 46 READ DATA 47 48 RESERVED 49 50 RESERVED NOTE Also check Factory Configuration of Option Traces and Program Shunt Trace Functions table when interfacing Connector P1 can be for flat cable or twisted wire pairs The two tables below list the respective requirements Table 5 Signal Connector P1 Requirements for Flat Cable CONNECTOR 3415 0001 POLARIZING KEY 3439 0000 PRESS 3440 LOCATOR PLATE 3443 11 PLATEN 3442 1 FLAT CABLE 10 MAX Table 6 Signal Connector 1 Requirements for Twisted Wire Pairs D El TYPE 1 583717 1 1 5837
9. ke2avoc 07500 then 000 1900 35 3sv 35 6 4 avoc RETURN GNO AS V 133 ie Ww i M OTHERWISE SPECIFIED RESISTORS 5 1 4 5 2 ALL CAPALITORS IN MICROFARADS us mur 74 5132 QumeTrak 842DC Synchronous Motor PCB 84 REORDER NUMBER Q me MANUAL TITLE ee CO uim ITT REQUEST FOR READER S COMMENTS Qume Corporation attempts to provide documents that meet the needs of all Qume product users This form lets you participate directly in the documentation process Please restrict your comments to the usability accuracy readability organization and completeness of this document 1 Please specify by page any errors you found in this manual 2 Does the document cover the information you expected or required Please make suggestions for improvement 3 Is this the right type of document for your needs Is it at the right level What other types of documents are needed 4 Did you have any difficulty understanding descriptions or wording Where 5 Please rate this document on a scale of 1 to 10 with 10 being the best rating A DATE TITLE ___ COMPANY NAME DEPARTMENT ADDRESS CE ZIP CODE Please check here if you require a written reply WE D LIKE YOUR COMMENTS This document is one
10. 3 Remove the four write protect sensor leads from the J2 connector by pushing down on the sensor lead tabs in the connector with tweezers blue to J2 A14 orange to J2 B14 black to J2 A13 red to J2 B13 refer to the Connector Lead Removal illustration 4 Separate the four write protect sensor leads from the transducer cable Note the routing of the leads from the cable to the sensor 5 Remove the screw with captive washers which secures the write protect sensor assembly to the main frame casting Remove the assembly Replacement 1 Install the write protect sensor assembly on the main frame making sure the peg on the bot tom of the assembly is in the main frame hole Secure the assembly with a screw with captive washers 32 2 Route the four sensor leads along the transducer cable to the J2 connector 3 Install the leads in their proper locations in the J2 connector refer to step 3 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector is plugged in 4 Plug the J2 connector into the PCB 5 Install the bail assembly as outlined under Bail Assembly Replacement TRACK 99 SENSOR Removal 1 Disconnect the transducer cable connector 402 from the 2 Remove the four track 00 sensor leads from the J2 connector by pushing down on the sensor lead tabs in the connector with tweezers blue to J2 A12 orange
11. TIMING LINE INDEX SENSOR ASSEMBLY 008 A 029 Figure 41 Index Lamp Assembly Positioning 3 Align the pointer on the front of the index lamp assembly exactly with the timing line on the index sensor assembly installed directly below on the main frame 47 MAINTENANCE Tighten the two mounting screws while holding the lamp assembly firmly against the carrier to maintain the alignment 4 Proceed through Index Lamp and Sensor Alignment Check as outlined under Service Checks NOTE Do NOT change the position of the index sensor assembly it must remain firmly against the stop on the main frame casting STEPPER MOTOR DUST COVER WIPER ADJUSTMENT Access to and proper positioning of the stepper motor dust cover and the steel belt wiper are described under Dust Cover and Wiper Removal and Replacement HEAD CARRIAGE ASSEMBLY RADIAL ALIGNMENT This procedure establishes precise on track posi tioning of the R W heads It is to be done on track 38 or 40 using a Qume certified two sided CE alignment disk QUME P N 50236 01 or 50235 02 respectively The following procedure references track 40 CAUTION The head carriage assembly is factory ad justed and tested and is not field ser viceable Do not for any reason attempt to make repairs or internal adjustments on this assembly or clean the R W heads This can cause severe damage to the head surfaces or to the recording media 1 Remove the
12. Figure 46 Seek Error Troubleshooting Routine MAINTENANCE 15 STEEL BELT 5 REPLACE BROKEN STEEL BELT CHECK TRACK DRIVE OUTPUT J1 42 CHECK TRACK ACTIVE lt OAV SENSOR ASSEMBLY 2 11 15 TRACK ff REPLAGE SENSOR WORK SENSOR ASS Y ING REPLACE DRIVE P C BOARD DOES PROCEED THRU UNIT READ READ ERROR TRACK gg DATA ROUTINE 2 YES SEEK TO TRACK 76 DOES CHECK DIRECTION EAD CARRIAG 31 34 SIGNAL FROM CONTROLLER IS DIRECTION NO ACTIVE lt 0 44 CHECK CONTROLLER REPLACE DRIVE P C BOARD see and Replacement Procedures see Service Checks Figure 46 continued 57 MAINTENANCE 58 DOES UNIT READ TRACK 76 DATA 2 SELECT ALTER NATELY TO INNER OUTER amp CTR UNIT SEEK TRACKS DOES UNIT SEEK TRACKS 2 NO PERFORM HEAD CARRIAGE ASS Y RADIAL ALIGNMT CHECK FOR BINDS IN MECH ASS IES IS YES REPLACE STEEL BELT STEEL BELT KINKED HEAD CARRIAGE BINDING ON RAILS REPLACE HEAD CARRIAGE AND OR GUIDE RAILS IDLER ASS Y REPLACE IDLER ASSEMBLY REPLACE STEPPER MOTOR MOTOR BINDING SELECT SIDE 1 REPLACE BOARD TRACK g YES see Removal and Replacement Procedures
13. REPLACE DRIVE Y READ P C BOARD AMPLITUDES USE ALTERNATE R W DISK 15 NO DISK GOOD REPLACE DISK REPLACE CARRIAGE ASS Y ARE J REPLACE DRIVE READ BOARD AMPLITUDES O K YES See Removal and Replacement Procedures 200 a See Service Checks see Adjustments Figure 47 continued 61 MAINTENANCE PERFORM PREREQUISITE CHECKS 5 DISK WRITE PROTECTED NO ERROR ONLY WITH SAME DISK NO ERROR ONLY ON ONE SIDE INSERT PRERECOR DED DISK amp CLOSE DOOR SELECT DRIVE 1 DRIVE READY PROCEED NOT READY no ROUTINE YES SELECT SIDE amp LOAD HEADS Figure 48 Write Error Troubleshooting Routine 62 USE NON PRO TECTED DISK REPLACE DISK CHECK SIDE SELECT 41 14 FROM TROLLER SIDES TRUE lt 0 4V SIDE1 FALSE gt 2 4V YES REPLACE HEAD CARRIAGE ASS Y STILL ERROR ON SAME SIDE CHECK CONTROLLER REPLACE DRIVE P C BOARD see Removal and Replacement Procedures MAINTENANCE PROCEED THRU NO HEAD LOAD gents ROUTINE YES SELECT amp READ TRACK BELOW 43 PROCEED THRU READING 4 s DATA OK HEAD ERROR quem BOTH SIDES ROUTINE RECORD DATA amp WRITE DATA J1 38 CHECK SIGNALS WRITE GATE J1 40 TRUE lt 0 4V FROM
14. TRACK DENSITY RECORDING METHOD ACCESS TIME AVERAGE TRACK TO TRACK SETTLING SINGLE DENSITY DOUBLE DENSITY 0 8M bytes 1 6M bytes 0 6M bytes 1 2M bytes 3408 48 ROTATIONAL SPEED 360 RPM 360 TRANSFER RATE 250K bits sec 500K bits sec 91 ms 3ms 15 ms 6816 BPI 48 TPI 91 ms 3 ms 15 ms 1 INTRODUCTION time 3ms track to track is accomplished by precision steel belt drive mechanism that affords minimal wear with low power dissipation The QumeTrak 842 s weigh only 13 pounds six kg and two drives can be mounted horizontally or three drives vertically in a standard 19 inch rack or panel unit Refer to the section on INSTALLATION for additional installation requirements Standard features on the QumeTrak 842 include Negative DC power supply not required e Daisy chain capability for up to four disk drives e 150 write protect circuitry Program controlled door lock that prevents removal of the disk when the R W heads are loaded or in use e In Use LED activity indicator on the front panel SPECIFICATIONS AND RELIABILITY This disk drive provides a storage capacity of 0 6M bytes on a two sided single density flexible disk IBM DISKETTE 2 or equivalent and 1 2M bytes on the two sided double density flexible disk IBM DISKETTE 2D or equivalent Refer to the table above for additional performance specifications The n
15. PWR MONITOR SIDE SELECT LOGIC HEAD LOAD CONTROL LOGIC STEPPER MOTOR CONTROL DISK DRIVE MONITOR AND CONTROL LOGIC HEAD LOAD SOLENOID HEAD CARRIAGE STEPPER MOTOR NDEX SENSORS TRACK SENSOR DOOR LOCK SOLENOID 44 299 484 929 6 91 gt o n DRIVE SELECT 6 DRIVE SELECT 2 28 DRIVE SELECT 3 DRIVE SELECT 4 3 4 e 7 5 12515912 SEE sv 5 Ti Sir DT e RNH Binary 3 x a H 5H 2 5vO gt ojus 5 3 0 a 9 OEN 15 2 m 5 T 3 12 12 3 OLENOID 2 m esci383 053 OHOLE 222 E 1 93 np 7546 2P c 5 B eee ae 3 Ae cR OCCR LOCK 5 1 28 Je SOLENOID Heer alaso OPTION E ATK 38 RN4 330 aa es 0 Je 4 IN USE LED ENS 2 Mas 02 24 e4v 0 YO 6 STEPPER EAS 2471 09 0 ec HEAD LOAD e 2 REAOY SH 2 EAD Put isu2 0 J ALTERNATE 170 4 9 2 Jt XUCTERWATE 175 6 JI ALTERNATE 1 0 Jt USE 5 TRACK 54 2 5 DIRECTION 69
16. QumeTrak 842 Maintenance December 1981 2350 Qume Drive Jose California 95131 TWX 910 338 0232 4 8 942 4000 Reorder Number 36027 41981 Qume Corporation Qume Qume Caribe Inc Q Q30 Q45 Sprint Sprint 45 Sprint 55 Sprint 3 Sprint Micro 3 Sprint Micro 3 35 Sprint Micro 3 45 Sprint Micro 3 55 Sprint 5 Sprint Micro 5 Sprint Micro 5 45 Sprint Micro 5 55 Sprint 5 WideTrack Sprint 7 Series Sprint 7 35 Sprint 7 45 Sprint 7 55 Sprint 9 Series Sprint 9 35 Sprint 9 45 Sprint 9 55 WideTrack TwinTrack PHD SpeedFeed SpeedFeed 5 Multifeed Twintellect Wedge Activity Monitor Multi Color QPW Multistrike MS and Quickload are Trademarks or Registered Trademarks of Qume Corporation Contents of this publication may be changed at any time without notice and shall not be regarded as a warranty FOREWORD This manual is one of a group of publications concerning the QumeTrak 842 Flexible Disk Drive Each manual covers the entire disk drive but from a different aspect Some subjects will be found in more than one publica tion with the text description being more or less technically detailed as required for the intended reader Title Publication Number QumeTrak 842 Product Specifications Manual 36023 Memory Product Service amp Spares Catalog 37032 TABLE OF CONTENTS PAGE INTRODUCTION 1 1 DESCRIPTION dria ke d a Rr 1 General
17. VERIFY SEEK see Service Checks Q K See Adjustments Figure 46 continued PROCEED THRU NOT READY ROUTINE PROCEED THRU NO HEAD LOAD ROUTINE PERFORM PREREQUISITE CHECKS ERROR ONLY ON ONE SIDE INSERT PRERECOR DED DISK SELECT DRIVE 15 DRIVE READY 5 SELECT SIDE LOAD HEADS ARE HEADS LOADED YES SEEK TO TRACK gg CHECK TRACK J1 42 SIGNAL STATUS MAINTENANCE TROLLER SIDE 0 TRUE lt 0 4V FALSE gt 2 4 CHECK CONTROLLER REPLACE HEAD CARRIAGE ASS Y see Removal and Replacement Procedures Figure 47 Read Error Troubleshooting Routine 59 MAINTENANCE 60 PROCEED THRU SEEK ERROR ROUTINE PROCEED THRU SEEK ERROR ROUTINE PROCEED THRU IS ERROR TRACK gg TRUE 0 4V ROUTINE STEP TO TRACK 40 FIND TRACK 40 READ TRACK 40 SIGNAL STEP TO TRACK 76 FIND TRACK 76 0 K READ TRACK 76 SIGNAL O K 0 YES VERIFY READ SEEK TO TRACK fff PERFORM HEAD CARRIAGE 55 RADIAL ALIGNMENT kkk PERFORM HEAD CARRIAGE ASS Y RADIAL ALIGNMENT kak see Removal and Replacement Procedures x x See Service Checks x x See Adjustments Figure 47 continued MAINTENANCE CHECK FOR READ DATA OUT PUT 91 46 YES A rbd CHECK CONTROLLER 2 gt NO PERFORM R W HEAD READ AMPLITUDE CHECK k k ARE
18. X pes Assembly Bail Adjustment Collet Assembly 5 5 iN eh LAN ce Figure 50b Illustrated Parts Locations 71 DIAGRAMS Pop up Assembly TA Pop up Slider Dust Seal Cover Spindle Figure 50c Illustrated Parts Locations 72 DIAGRAMS Assembly Stepper Motor Pulley Carriage Head Carriage Assembly Assembly Figure 50d Illustrated Parts Locations 73 DIAGRAMS Motor Capacitor AC Power i Connector J0 Spindle Drive Head Guide Bar Assembly Clamps 2 Assembly Base e x Timing block may not be present Figure 50e Illustrated Parts Locations 74 DIAGRAMS Track 00 Sensor Assembly 2 Head Load Solenoid with Plunger amp Shims Write Protect Sensor Assembly Sensor Assembly Figure 501 Illustrated Parts Locations 75 94 LOW CURRENT E ES WRITE PROTECT SENSOR WRITE GATE LOGIC SIDE SELECT ALT 1 0 ALT HEAD LOAD STEP ALTERNATE 19019 2 8 Ls omiy TRACK 28 ALT TWO SIDED ALT DISK CHANGE DRIVE SELECT INPUTS LT IN USE _ ERASE AND WRITE CIRCUITS LOGIC AND CONTROL READ CIRCUITS ERASE HEADS 1 DISTRIBUTION
19. 4 98828 Connector CR33 CR29 CR27 up aer GR e A18 1 y 8 222 27 Me 82 es Be B 8308 DDS j ea DEA 0 1 0 65 C44 sige Select Q 5382 C e 5 ab E A138 15 5 T40 HA GND C32 J1 Interface Connector s DL DS GND 7855 3995 999 112 Cap CFE Optional 0 P Test Points Programmable Shunts Alternate 10 925 gt Pins 87514 4 Tri ABXRIZ D 5 20 4 c Radial Ready Index 28 30 8 5 ao WP NP 989 Write Protect JO AC Q 4 Connector lt 0 O Terminators Test Points TERMINATOR uw cu SECUN 18 rr en Dor lt lt 831 Figure 17 Jumper Locations Test Points 8 Connector Pin Assignments 14 INCORPORATION OF OPTIONS PROGRAMMABLE SHUNT A 16 pin programmable shunt with seven jumpers shorts in place for commonly used trace cut op tions is factory installed on the drive P C board CUSTOMER STRAPPABLE OPTIONS Designations and functions of these jumpers shorted vs open are listed below Table 13 Programmable Shunt Trace Functions TRACE FUNCTION SHORTED STD FUNCTION OPEN OPTION DRIVE SELECT ACTIVE DRIVE SELECT ACTIVE HEAD LOAD ACTIVE FROM DRIVE SELECT IN USE ACTIVE FROM DRIVE SELECT STEPPER MOTOR POWER ACTIVE FROM HEAD LOAD
20. CHECK 15 OUTPUT Y REPLACE HEAD TP1A 1B CARRIAGE ASS Y CHECK CONTROL LER see Removal and Replacement Procedures VERIFY see Service Checks HEAD LOAD O K See Adjustments Figure 49 No Head Load Troubleshooting Routine 65 RECOMMENDED SPARE PARTS Listed in the tables below are parts and subas semblies of the QumeTrak 842 disk drive items are identified by Qume part numbers and the quantities shown are recommended to sup port a given quantitiy of disk drives Description and locations of all listed items may be found on the illustrated Parts Locations drawings 6 sheets in the Diagrams section The Qume Memory Products Service and Spares Catalog publication number 37032 contains a complete list of all replaceable QumeTrak 842 parts as well as prices and terms for parts and repairs lt also states basic Qume service policy Table 20 Recommended Spare Parts Field Level DESCRIPTION IN USE LED WRITE PROTECT SENSOR TRACK 00 SENSOR INDEX SENSOR INDEX LAMP DRIVE BELT WIPER PCB ASSEMBLY HEAD CARRIAGE ASSEMBLY STEEL BELT STEPPER MOTOR 50096 01 50007 01 50006 01 50008 01 50061 01 50025 01 50036 01 50147 01 50011 02 50028 01 50009 01 NUMBER OF DISK DRIVES 50 100 250 500 1000 NUMBER OF SPARE PARTS a N NO 5 5 5 5 4 5 5 4 3 3 Ts O 67 RECOMMENDED SPARE PARTS Table 21 Recomme
21. of zero is typical while the head carriage assembly needs to be replaced if the azimuth exceeds x 18 min Head azimuth cannot be adjusted 1 Power up the disk drive 2 Insert a CE alignment disk QUME 50235 02 or 50236 01 in the drive and close the drive door 25 MAINTENANCE 3 Load the R W heads onto the CE disk 4 Select a disk side 5 Step the head carriage assembly to track 76 6 Use a dual trace oscilloscope Tektronix 465 or equivalent and eConnect channel 1 to test point 1A and channel 2 to test point 1B on the disk drive PCB eattach the probe ground clips to the ground GND test point on the PCB eset the vertical deflection for both channels to 50mV div eset both inputs to AC einvert channel 2 eadd channel 1 to channel 2 eset the horizontal sweep to 0 5ms div eattach an external trigger to test point 3 index 26 timing on the PCB and set the trigger source to external eset the trigger coupling to AC and the trigger mode to external e trigger on the leading edge of the index pulse 7 Compare the wave form displayed to the Azimuth Check illustration below If the displayed wave form is not within 18 minutes the head carriage assembly needs to be replaced 8 Select the other disk side to test the second head and repeat step 7 9 Unload the R W heads 10 Remove the CE disk from the drive 11 Disconnect the oscilloscope from the disk drive MAINTENANCE M
22. 0 4 MAX RUNNING AC POWER REQUIREMENTS 200 230 VAC 200 230 VAC 10 0 6 A MAX START UP INSTALLATIONS 50 60 HZ 1 0 3 MAX RUNNING VOLTAGE RIPPLE __ CURRENT IUE ore 2 3 3 DRIVES 4 DRIVES DC POWER 24 Y 0 1 V P P TYP 0 7 0 8 0 9 1 0 REQUIREMENTS 10 1 0 1 2 1 4 1 6 5 V 0 05 V 9 1 6 2 3 3 0 5 MAX 1 3 2 2 3 1 4 0 POWER 55 W 190 BTU HR MAX DISSIPATION OPERATING STORAGE TEMPERATURE 5 C TO 43 C 10 C TO 45 C 41 F TO 110 F 14 F TO 113 F ENVIRONMENTAL RELATIVE 20 TO 80 8 TO 80 HUMIDITY MAX WET BULB 29 C 84 F NO CONDENSATION MECHANICAL REFER TO PARAGRAPH ON MOUNTING NOTES Not applicable to the QumeTrak 842DC disk drive Refer to the APPENDIX for QumeTrak 842DC disk drive power requirements DC power voltage as specified is at the DC power connector J5 on the PCB DC supply current is for drives that are normally installed without customer options If the stepper motor and door solenoid are energized on ail drives continuously the maxi mum current requirement for the 24V supply is 1 0 A times the number of drives on the dais y chain 12 CUSTOMER STRAPPABLE OPTIONS GENERAL QumeTrak 842 may be modified to alter the functions that were described in the Interface section These modifications are made by adding or deleting traces installing pluggable 5 an
23. CONTROLLER LOW CURRENT J1 2 FALSE gt 2 4 NO INPUT SIGNALS CHECK CONTROLLER OK CHECK ERASE HEAD VOLTAGE TP4 WHILE RECORDING ARE 5V PRESENT AT TP4 CHECK WRITE 91 44 SIG CHECK WRITE PROTECT SENSOR TRUE lt 0 4V ASS Y 814 A13 REPLACE 2222 REPLACE SENSOR DRIVE BOARD WORKING O K ASSEMBLY RECORD ON A TRACK BELOW 43 BOTH SIDES see Removal and Replacement Procedures see Service Checks Figure 48 continued 63 MAINTENANCE READ DATA JUST RECORDED NO f REPLACE HEAD CARRIAGE ASS Y YES STEP TO TRACK BETWEEN 44 amp 76 READ DATA BOTH SIDES DOES UNIT READ DATA O K PROCEED THRU SEEK ERROR ROUTINE YES RECORD DATA BOTH SIDES 8 gt OW CUR 0 CHECK CONTROLLER NO REPLACE HEAD CARRIAGE ASS Y YES VERIFY WRITE see Removal and Replacement Procedures Figure 48 continued 64 MAINTENANCE R W HEADS NOT LOADING ONTO DISK CHECK STATUS OF JUMPERS 15 JUMPER CONFIGURAT CORRECT CONFIGU OK RATION INITIATE HEAD LOAD COMMAND CHECK VOLTAGE ACROSS HEAD LOAD SOLENOID J2 B1 A1 Y 22V 5 SOLENOID REPLACE DRIVE ENERGIZED P C BOARD O K IS SOLENOID REPLACE HEAD FUNCTIONING LOAD SOLENOID PERFORM HEAD OR BAIL ASS Y LOAD ASS Y ADJUST H BINDING MENT PERFORM HEAD LOAD TIME
24. Checks in this part of the manual Periodic adjust ments are not required under normal operating conditions CAUTION The head carriage assembly is factory ad justed and tested and is not field service able Do not for any reason attempt to repair this internal component This can cause severe damage to the head surfaces or head support springs PERIODIC CLEANING Cleanness is extremely important for the proper care of the disk drive Perform this routine every six months or as required 1 Eject the disk if installed and detach and DC J5 connectors from the unit Refer to the PCB Jumper Locations Test Points amp Connector Pin Assignments illustration 2 Gain access to the disk drive s interior 3 With a soft brush and lint free cloth remove all dust deposits from the spindle drive motor and the surrounding area 4 Check the entire drive unit and very cautious ly eliminate any dirt or corrosion Replace parts which may show evidence of wear or binding refer to Removal and Replacement Procedures as required Be sure to leave the drive free from lint 5 Periodic cleaning of the R W heads is mended by using a quality head cleaning disk according to manufacturer instructions MAINTENANCE TOOLS AND EQUIPMENT The tools and equipment listed in the table below are required for general maintenance of the QumeTrak 842 The hand tools are available at most hardware stores the tes
25. GAP OF 0 004 TO 0 010 INCH 0 1 TO 0 25mm Figure 40 R W Head Gap Adjustment e Turn the backstop screw in the carrier assembly see illustration below to adjust the gap between the unloaded R W heads The gap must be between 0 004 to 0 010 inch 0 1 to 0 25mm the nominal thickness of one ANSI stan MAINTENANCE dard disk is 0 003 inch 0 076mm it cannot be measured and must be estimated Carefully turn ing the backstop screw clockwise will bring the R W heads closer together e Open and close the drive door then load and unload the R W heads again and verify proper head gap spacing by sighting through the disk slot in the head carriage assembly as instructed above If necessary repeat the adjusting procedure e Power down the disk drive and remove the paper from the left hand front corner remove the temporary jumper from test points HA and GND if present e Secure the backstop screw with threadlocking compound e g Loctite 222 6 Perform Head Load Time Check as outlined under Service Checks to ascertain that head load solenoid plunger or bail hinge are not binding INDEX LAMP ALIGNMENT 1 Close the disk drive front door 2 Slightly loosen the two screws which mount the index lamp assembly to the carrier assembly V NCARRIER ASSEMBLY NE INDEX 2 2 SIDED DISC a MN INDEX 1 SINGLE SIDED f 8 DISC SENSOR 8 gt Z h m7 4 INDEX LAMP ASSEMBLY
26. READY IN MULTIPLEX MODE REFER TO NOTE 1 INDEX IN MULTIPLEX MODE REFER TO NOTE 1 DRIVE SELECT ACTIVE HEAD LOAD ACTIVE FROM DRIVE SELECT DRIVE SELECT ACTIVE HEAD LOAD ACTIVE HEAD LOAD ACTIVE FROM DRIVE SELECT OR IN USE IN USE ACTIVE FROM HEAD LOAD OR OPTIONAL IN USE 1 0 STEPPER MOTOR POWER IS ALWAYS ACTIVE READY IN RADIAL MODE REFER TO NOTE 2 INDEX IN RADIAL MODE REFER TO NOTE 2 NOTES 1 Multiplex mode requires DRIVE SELECT to check that the READY and or INDEX lines are active on any drive 2 Radial mode allows the controller to check that the READY and or INDEX lines are active on any drive without DRIVE SELECT DRIVE SELECT OPTIONS Factory configuration of the Drive Select circuit allows for up to four drives to be addressed in a daisy chain arrangement Normally a jumper is factory installed in location 051 designating the drive as number one Moving this jumper to any one of the three remaining locations DS2 4 designates the drive for the corresponding posi tion number Two other options are available Option 1 This option allows direct selection of the disk sides of up to two daisy chained double sided drives The four disk sides are addressed as if they were separate drives on the existing four DRIVE SELECT input lines Detailed instructions on input configuration and jumper status are presented below under Side Select Options Option 2 This option allows up to eight dr
27. away from the front door until it engages under the pawls of the pop up lever MAINTENANCE 4 Open the drive door to within approximately 1 4 inch of being fully opened hold it there 5 Rotate the pop up adjustment screw counterclockwise until the pop up slider is just unlatched 6 Repeat steps 3 and 4 to verify reliable pop up unlatching when the door is within 1 4 inch of fully open 7 Secure the pop up setscrew with threadlock ing compound e g Loctite 222 POP UP ADJUSTMENT SCREW HEAD LOAD SOLENOID ASSEMBLY ADJUSTMENT 1 Position the disk drive on a stable flat sur face interior mechanism exposed with drive motor side up PCB down 2 Install a disk in the drive and close the drive door 3 If disconnected restore power connections and power up the disk drive 4 Perform bail gap adjustment as outlined Figure 38 Pop Up Adjustment POP UP ASSEMBLY POP UP SLIDER LATCHED 008 A 047 e Slightly 1 turn loosen the two head load solenoid mounting screws Access to these screws is through holes in the side of the main frame casting see illustration below Slide the head carriage assembly by hand to the end of its range of travel all the way toward the rear of the disk drive track 00 position e Load the heads against the disk this may be done by a temporary jumper installed across test points HA and GND on the PCB e Turn the solenoid adjusting screw in the 45 MAINTEN
28. casting 3 Remove the AC connector from the connector bracket by compressing from the front the two clips which hold the connector in its bracket Use pliers 4 Remove the two screws with captive washers securing the capacitor and clamp to the main frame 5 Remove the three screws and washers secur ing the drive motor to the main frame and lift out the drive motor assembly Replacement Refer to the illustration below 1 Install the drive motor on the frame by pushing the motor against the main frame stops and securing it with three screws with captive washers 2 Mount the capacitor and to the main frame with two screws with captive washers 3 Install the connector by pushing it into the AC connector bracket The clips on either side of the connector will secure it 4 Secure the blue AC connector ground lead to the main frame with a screw nickel plated washer and star washer 5 Proceed through Spindle Drive Belt and Drive Pulley Replacement and re install the PCB as outlined above CAPACITOR AND CLAMP AC CONNECTOR BRACKET NICKEL PLATED SCREW CONNECTOR GROUND LEAD BLUE AC CONNECTOR CLIP Que CONNECTOR 0 008 A 026B Figure 25 Drive Motor Assembly Removal and Replacement IN USE LED Removal 1 Disconnect the transducer cable connector J2 from the PCB 2 Remove the two In
29. e or release the index lamp leads from the J2 connector by pushing down on the lead tabs in the connector with tweezers black to J2 A8 red to J2 B8 separate the index lamp leads from the transducer cable CAUTION The carrier assembly is spring loaded and will swing upward when the screws securing the carrier to the door latch plate are removed Do NOT permit the carrier front to swing up beyond the top edge of the front bezel as this may cause serious damage to the R W head support springs in the head carriage assembly The head springs are precision preloaded and must not be flexed beyond their normal operating range 3 While holding the front of the carrier assembly down against the spring tension remove the two front screws and washers which secure the carrier to the door latch plate 4 Squeeze the ready off lever which is located towards the rear on the bail side of the carrier and 34 lifts the bail assembly by hand towards the side of the carrier assembly until it clears the hook of the bail assembly Let the front of the bail assembly swing up disengaging ready off lever and bail hook 5 While holding down the front of the bail assembly slightly to gain access to the rear car rier screws remove both screws alternately a few turns at a time Lift the carrier assembly from the drive unit INDEX READY LAMP LEADS OFF LEVER 7 REAR CARRIER SCREWS 2 CARRIER SPRINGS 2 GUIDE C
30. is plugged in 7 Re install the spindle drive belt and the PCB as outlined in the applicable instructions 8 Re install the bail assembly as outlined under Bail Assembly Replacement perform Head Load Solenoid Assembly Adjustment as outlined under Adjustments DUST COVER AND WIPER Removal 1 Proceed through Pop Up Assembly Removal as outlined above 2 Remove the two screws with captive washers which secure the dust cover to the stepper motor flange Lift off the cover 3 If only the wiper is to be replaced remove it from the dust cover STEEL BELT STEPPER MOTOR ASSEMBLY DUST COVER Figure 32 Dust Cover Removal and Replacement Replacement Refer to the illustration above 1 If the wiper is being replaced install the new wiper in the dust cover by pushing it against the cover stop in the direction of the arrow on the cover 2 install the dust cover loosely with the two screws with captive washers on the stepper motor flange 3 Align the dust cover so that the exposed wiper end lightly touches the steel belt Secure the cover in this position by tightening the two screws 4 Follow the Pop Up Assembly Replacement instructions to install the pop up assembly pro ceed through Pop Up Assembly Adjustment STEEL BELT Removal Refer to the illustrations below 1 Remove the pop up assembly as outlined under Pop Up Assembly Removal CAUTION Be careful not to kink the steel belt w
31. of a series describing Qume products Your comments on the back of this form will help us produce better manuals Each reply will be carefully reviewed by the responsi ble person All comments and suggestions become the property of Qume Corporation Qume Corporation Attn Technical Publications 2350 Qume Drive San Jose CA 95131
32. on the disk drive PCB e select external trigger source set the trigger coupling to AC and the trigger mode to normal preset the trigger for positive slope 4 Load the drive heads against the disk This may be done by controller signal DRIVE SELECT in a factory configured drive or by HEAD LOAD controller signal with jumper B removed and jumper C installed or by disconnecting inter face connector P1 J1 and closing a remote single pole switch temporarily connected between jumper pins HA and GND on the drive PCB HEAD LOAD TIME 35ms MAX 008 A 052 Figure 20 Head Load Time Check 5 Sel amp tt a disk side and track with 1F data pat tern 6 Observe the read signal waveform the scope and adjust the scope vertical gain for amplitude of 5 divisions 100 at the lowest peak to peak point of the displayed envelope see illustration above 24 7 Repeatedly load and unload the heads and adjust the scope s trigger slope control so that the scope display trace will be triggered by the head load command 8 Read on the scope screen the time it takes for the signal envelope to reach and remain above the 80 amplitude point 2 divisions above center line from the beginning trigger point of the display trace This head loading time must be less than or equal to 35 ms as shown in illustration b above 9 Select a track with data pattern on the se cond disk side a
33. play 29 MAINTENANCE SOLENOID PLUNGER SPRING 008 A 026A Figure 24 Assembly Re Installation 6 Hook the spring to the spring support arm on the head load solenoid 7 Open the drive door and again verify freedom of movement of the solenoid plunger and of the bail assembly Refer to the Head Load Solenoid Adjustment procedure if the solenoid plunger should be binding 8 Remove the paper strip from between the R W heads 9 Perform Head Load Solenoid Adjustment Check and Head Load Time Check as outlined under Service Checks BAIL BASE Removal Refer to sheet of the Illustrated Parts Locations drawings for identification of items and locations mentioned below 1 Proceed through Bail Assembly Removal as outlined above 2 Remove the screw with captive washers that secures the bail base to the main frame casting 3 Lift out the bail base Replacement 1 Install the bail base in the drive inserting the bail base tip into the horizontal guides on the in side of the front bezel 2 Secure the bail base with a screw with captive washers 30 3 Proceed through the Bail Assembly Replace ment as outlined above DRIVE MOTOR ASSEMBLY Removal Refer to the illustration below 1 Proceed through PCB Removal and Spindle Drive Belt and Drive Pulley Removal as outlined above 2 Remove the screw and two washers securing the blue AC connector ground lead to the main frame
34. pop up assembly as outlined under Pop Up Assembly Removal 2 Place the disk drive on its side to orient it with the screwdriver access slot in the side of the main frame pointing up as shown in the Stepper Motor Pulley Track 40 Alignment illustration below 3 Move the head carriage assembly by hand so that the timing hole in the stepper motor pulley lines up precisely above the timing slot in the stepper motor flange This is Track 40 Position and is illustrated below In this position the steel belt carriage clamp screws also will be lined up with the access slot 48 in the side of the main frame casting STEPPER MOTOR PULLEY IN TRACK 40 POSITION FLANGE TA BELT CLAMP 7 TIMING ACCESS SLOT MIN SLOT MAIN FRAME 5257 MOTOR FLANGE STEEL BELT CLAMP MOTOR MOUNTING SCREWS BOTTOM 008 A 044 Figure 42 Stepper Motor Pulley Track 40 Align ment IDLER ASSEMBLY 4 if disconnected restore power connections and power up the disk drive 5 Connect a temporary jumper across test point pins T40 on the PCB Verify that the stepper motor pulley remained in track 40 Position repeat step 3 above if necessary 6 Use a dual trace oscilloscope Tektronix 465 or equivalent and e Connect channel 1 to test point 1A and channel 2 to test point 1B on the disk drive PCB e attach the probe ground clips to the ground GND test point on the PCB set the vertical deflection for both chan
35. that the plastic ends on the door latch 44 plate do not bind against the guide tabs on the in side of the front bezel when the door is opened and closed Repeat step 3 as may be required 5 Close the disk drive front door 6 Push down on the carrier assembly near the front carrier screws to obtain a gap between the carrier cross member and the E ring of the collet assembly shaft Insert a feeler gauge in the gap and establish a gap size of 0 020 to 0 060 inch 0 5 to 1 5mm as il lustrated below CHECK FOR GAP OF 0 020 TO 0 060 INCH 0 5 TO 1 5MM CARRIER 145 ASSEMBLY COLLET ASSEMBLY 008 A 032 Figure 37 Carrier Collet Assembly Adjustment 7 Align the drive front door so that it is parallel with the recess of the front bezel and tighten the two carrier front screws 8 Open and close the drive door Verify that the gap size between collet E ring and carrier assembly is as specified above and that the front door is parallel with the front bezel Repeat steps 6 and 7 as may be necessary 9 Proceed through R W Head Gap Adjustment as outlined under Head Load Solenoid Adjust ment 10 Proceed through Pop Up Assembly Adjust ment as outlined below POP UP ASSEMBLY ADJUSTMENT 1 Power down the disk drive 2 Rotate the pop up adjustment screw the carrier assembly clockwise as much as possible 3 Close the drive door and latch the pop up slider by sliding it toward the rear of the drive
36. the slider on the idler assembly forward against the tension spring and lift the steel belt from the idler roller see Steel Belt Stepper Mechanism illustration above 3 Remove the two screws with captive washers which secure the idler assembly to the main frame casting Remove the assembly MAINTENANCE Replacement 1 Move the head carriage assembly by hand to track 76 position all the way towards the drive front 2 Set the idler assembly in place the main frame casting and loosely secure it with two screws with captive washers 3 Push the idler assembly forward toward the stepper motor and tighten the two screws 4 Push the slider on the idler assembly forward against the tension spring and place the steel belt over the idler roller 5 Pull the steel belt back and forth to check that it is running centered on the idler roller throughout the belt s travel Repeat this step several times to be certain STEPPER MOTOR ASSEMBLY Removal Refer to sheets c and d of the lllustrated Parts Locations drawings for identification of items and locations mentioned below 1 Disconnect the transducer cable connector J2 from the PCB 2 Remove the five stepper motor leads from the J2 connector by pushing down on the lead tabs in the connector with tweezers blue to 12 45 red to J2 A4 yellow to J2 B4 green to J2 A3 white to J2 B3 see Connector Lead Removal illustration 3 Separate five stepper
37. whenever possible as it may cause head damage Do place any objects between the heads to measure the head gap 23 MAINTENANCE If there is no gap between the heads or the gap appears too wide perform the head gap adjust ment as outlined under Head Load Solenoid Ad justment 18 Power down the disk drive and remove the paper from the left hand front corner remove the temporary jumper from across test points HA and if present HEAD LOAD TIME CHECK The head loading time should be checked after maintenance involving the bail bail base head load solenoid or head carriage assemblies This check verifies the free and proper movement and interaction of head load solenoid plunger bail and R W head lifting mechanism 1 Power up the disk drive 2 Insert a prerecorded disk and close the drive door 3 Use a dual trace oscilloscope Tektronix 465 or equivalent and 5 DIV MIN PIP POINT e Connect channel 1 to test point 1 and channel 2 to test point 1B on the disk drive PCB e attach the probe ground clips to the ground GND test point on the PCB set the vertical deflection for both channels to 50mV div set both inputs to AC invert channel 2 add channel 1 to channel 2 set horizontal sweep to 10ms div attach the external trigger probe to pro grammable shunt jumper HL head load
38. 17 1 5 583616 5 583854 3 POLARIZING KEY 583274 1 583274 1 091 0071 000 CRIMP TOOL EXTRACTOR TOOL 90268 1 91073 1 91073 1 TWISTED PAIRS 20 FEET MAX AWG 26 AWG 26 DC POWER DC power is interfaced through connector P5 J5 The two tables below list the connector pin assignments and the cable requirements Table 7 DC Connector P5 J5 Pin Assignments 24 VDC 24 V RETURN GND NOT USED GND NOT USED 5 VDC 5 V RETURN GND INTERFACE Table 8 DC Connector P5 J5 Requirements 5 45 CABLE SIDE DRIVE SIDE PARTS AMP PIN AMP PIN HOUSING 1 480270 0 1 380999 0 CONTACT 6 PINS 60619 1 CRIMP TOOL 90124 2 EXTRACTOR TOOL 1 305183 2 CABLE 10 FEET MAX AWG 18 OR 16 AC POWER AC power is interfaced through connector The two tables below list the connector pin assignments and the cable requirements Table 9 AC Connector P0 J0 Pin Assignments PIN NO SIGNAL NAME AC INPUT FRAME GROUND AC INPUT NEUTRAL Table 10 AC Connector P0 J0 Requirements PO 40 CABLE SIDE DRIVE SIDE AMP PIN AMP PIN HOUSING 1 480700 0 1 480701 0 CONTACT 3 PINS 350550 1 350705 1 AND 350669 1 CRIMP TOOL 90296 1 90296 1 EXTRACTOR TOOL 458994 1 458994 1 CABLE 20 FEET MAX AWG 18 OR 16 AWG 18 OR 16 TERMINATORS Input line terminators in the form of two DIP resistor modules must be plugged into DIP sockets on the PCB o
39. 44 Drive Door and Carrier Assembly Alignment 44 Pop up Assembly 45 Head Load Solenoid Assembly Adjustment 45 Bail gap 45 R W head gap adjustment 46 index Lamp Alignment 47 Stepper Motor Dust Cover Wiper Adjustment 48 Head Carriage Assembly Radial Alignment 48 TROUBLESHOOTING 51 General ecd aaa sce for Sox 0 aa d Matas 51 Definition of Malfunction Terms 51 Prereauisite CHECKS 46836540 AO 51 Troubleshooting Preconditions 51 aia now 52 Troubleshooting Flow 5 52 RECOMMENDED SPARE PARTS 67 DIAGRAMS gt gt Ii RS 8 69 APPENDIX Dae on os 83 QUMETRAK 84200 UNIQUE 83 FIG O NO CB N LIST OF ILLUSTRATIONS TITLE PAGE Recommended Controller interface Circuits 8 Track Access 4 Read Timing AAA E 4 Write TIMING esci ao aa aces a 5 Step Timing Sad E Ra osa 5 Write Data Timing for Fr
40. 5 and 6 above 10 Unload the heads and remove the disk from the drive 11 If the bail gap is within the stated tolerance throughout the head carriage assembly range of travel proceed to check the head gap as outlined below the bail gap is outside the stated tolerance form the bail gap adjustment as outlined under Head Load Solenoid Assembly Adjustment 12 Rotate the disk drive so that the right hand rear corner of the main frame casting with the blue Qume type label is at the near edge of the supporting surface facing the operator 13 Upright into the left hand front corner of the disk drive the one farthest away place a piece of plain white paper 14 Slide the head carriage assembly by hand to approximately track 40 position in the middle of its range of travel see Head Carriage Assembly Belt Clamp Access illustration under Steel Belt Removal procedure 15 Close the drive door 16 Load and unload the heads one time see step 5 above 17 Look at the gap between the unloaded R W heads by looking from the right hand rear corner of the disk drive over the idier assembly through the head carriage assembly at the white paper surface in the left hand front corner The gap should be between 0 004 to 0 010 inch 0 1 to 0 25 the nominal thickness of one ANSI standard disk is 0 003 inch 0 076mm CAUTION The R W head surfaces should not be brought in contact with each other avoid this
41. 7 MAINTENANCE 8 Release the solenoid bracket from the frame casting by removing the two screws with washers SOLENOID CLAMP BRACKET SOLENOID MOUNTING SCREWS 2 SCREWDRIVER 7 ACCESS HOLES SOLENOID ASSEMBLY SOLENOID ADJUSTING WRITE PROTECT SENSOR RE 008 A 050 Figure 31 Head Load Solenoid Removal and Replacement Replacement 1 Remove three screws and release the mount ing bracket from the replacement solenoid assembly CAUTION Do not exchange solenoid mounting brackets or plungers by themselves as this may cause solenoid performance problems Always replace the complete solenoid with mounting bracket 2 Mount the solenoid bracket to the main frame casting with two screws and washers pushing the bracket toward the center of the drive while tightening the screws 3 Install the solenoid by inserting it from below through the main frame casting and mounting it to the solenoid bracket with two screws with washers Do not tighten these screws at this time 4 Loosely engage the solenoid adjusting screw see illustration above but do not tighten 38 5 Route the two head load solenoid leads along the transducer cable to the J2 connector 6 Install the two leads in the J2 connector refer to step 2 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector
42. 9 3 ug 5 4 WRITE GATE 60 R3 33K REAOY 1 SH 2 DS 1 n d 330 R21 R29 150 Q1 XN WRITE PROTECT SWITCH SIDE SEL 2 RIT SIDE SELECT s4 BINARY F 14N 5 1 4 SAO 5 O M 150 4 MATE PROTECT mn Tore T E 6 2 13 DE vec sn 1 d O2N nz SAVHOVIG 08 218 YeILOWNY weied eojd 1 4 v A CRI 0 9 6 25 943 R26 29 1 Res 250943 CRIS CRIS 15955 0 6 4 R33 520 cu To 4 7K RI w R35 wl 38 15955 su 3 2 WRITE I S WRLTEZO C READY RG 1 J5 24 35 RETURN 2 G Le 45 i 45 15v RETURNG 45 GROUND 3 RESERVED 6 24V R45 1 5K Kw 3 20266 u28 CR2O 3 9 R54 820 5 5 VO O 5v Ji uL 09 READ DATA FRAME GROUND SCHEMATIC E 4 SWVHOVIC DIAGRAMS CR36 CR32 VR s CR35 C CR31 CES CR34 CR30 CR28 CR33 CR29 CR27 A c Pu DO ee A18 1 C pestes 08 28 Ex Jee B5 6
43. ANCE SOLENOID MOUNTING SCREWS 2 SCREWDRIVER 1 A ACCESS HOLES SOLENOID ADJUSTING SCREW SOLENOID CLAMP BRACKET HEAD LOAD BAIL ASSEMBLY CHECK FOR GAP OF 0 02 TO 0 04 INCH N 0 5 TO 1 0mm 008 049 Figure 39 Gap Adjustment solenoid clamp bracket to adjust the gap between the metal bail plate on the bail assembly and the plastic carriage arm tab on the head carriage assembly The gap must be between 0 020 and 0 040 inch 0 5 to 1 0 mm Turning the screw clockwise decreases the gap e Tighten the head load solenoid mounting Screws Re check the bail gap size Verify that the solenoid is mounted perpen dicular to the main frame casting head load solenoid arm straight up and down and that the solenoid plunger is moving freely Unload the heads from the disk Slide the head carriage assembly hand the way to the other end of its range of travel track 76 position toward the disk spindle Again load the heads and verify that the bail gap is within the above stated tolerance If necessary repeat the adjustment 46 e Unload the heads and remove the disk from the drive 5 Perform R W head gap adjustment as outlined Rotate the disk drive so that the right hand rear corner of the main frame casting with the blue Qume type label is at the near edge of the supporting surface facing the operator Upright in the left hand front corner of the di
44. AXIMUM ALLOWABLE AZIMUTH ERROR OF 18 MINUTES BURST 4 15 25 LARGER IN AMPLITUDE THAN BURST 3 TYPICAL AZIMUTH ERROR OF 12 MINUTES BURSTS 3 AND 4 ARE EQUAL IN AMPLITUDE AN OPTIMUM ALIGNMENT OF ZERO MINUTES AZIMUTH ERROR BURSTS 1 AND 4 ARE EQUAL IN AMPLITUDE AS ARE BURSTS 2 AND 3 TYPICAL AZIMUTH ERROR OF 12 MINUTES BURSTS 1 AND 2 ARE EQUAL IN AMPLITUDE MAXIMUM ALLOWABLE AZIMUTH ERROR OF 18 MINUTES BURST 1 1 25 LARGER IN AMPLITUDE THAN BURST 2 USING QUME CERTIFIED 12 MINUTE CE DISK QUME 50235 02 OR 50236 01 THE AZIMUTH SHALL ACCEPTABLE IF A DRIVE SHOWS LESS THAN THE MAXIMUM ALLOWABLE 18 MINUTE AZIMUTH THE MAXIMUM ALLOWABLE AZIMUTH IS CONSI DERED TO BE ATTAINED WHEN BURST 1 IS 25 LARGER THAN BURST 2 OR IF BURST 4 15 25 LARGER THAN BURST 3 003 A 009 Figure 21 Azimuth Check 27 MAINTENANCE REMOVAL AND REPLACEMENT PROCEDURES For the procedures outlined in this section top and bottom interior mechanisms of the disk drive must be accessible Supply cables for AC and DC power to the drive unit are to be disconnected from their respective connectors and J5 in the drive A disk must not be installed in the drive unless specifically instructed otherwise Reference is made to the Illustrated Parts Loca tions drawings whcih identify parts and assembly names and locations and to numerous detail il lustrations in this section CAUTION Whenever performing any
45. Alignment illustration 10 If the lobes are not within 80 percent of each other loosen the two screws on the PCB side of the main frame which secure the stepper motor and slowly rotate the stepper motor assembly un til the lobes are of equal amplitude 11 Select the second disk side and note the cat eyes amplitude relationship 12a By turning the stepper motor assembly and alternately selecting disk sides 0 and 1 balance the radial alignment of the two R W heads with each other as much as possible while still remain ing within the 80 percent alignment specification for each R W head Balance the left lobe of RIW head 0 with the right lobe of R W head 1 126 If a balanced condition within the 80 per cent specification between both R W heads can not be obtained with the available rotational range of the stepper motor and only under this circumstance proceed as follows Set the stepper motor to the approximate 50 center of its rotational adjustment range and tighten the two mounting screws e Through the access slot in the side of the main frame casting slightly loosen the two screws with captive washers which secure clamp plate and steel belt to the head carriage assembly e Very carefully move the head carriage assembly to balance the radial alignment position of the two R W heads with each other as well as possible while still maintaining the 80 percent alignment specification for each R W head e
46. Carefully tighten the two steel belt clamp screws e lf necessary again loosen the two stepper motor mounting screws and repeat step 12a above to fine tune the alignment before continu ing with the steps below 13 Alternately tighten the two screws securing the stepper motor assembly to the main frame a little at a time to maintain the R W head align ment 14 Remove the temporary jumper from across test point pins T40 on the PCB 15 To check the accuracy of the alignment step to track 39 and back to track 40 and then step to track 41 and back to track 40 Note the difference in cat eyes amplitudes which may result when approaching track 40 from either direction If the 80 percent specification is exceeded by either R W head in either direction loosen the stepper motor mounting screws again and op timize the offset In this case steps 12 and 13 above followed by step 15 must be repeated 16 Unload the R W heads from the disk 17 Remove the CE disk from the drive 18 Disconnect the oscilloscope from the disk drive 19 Install the pop up assembly as outlined under Pop Up Assembly Replacement perform Pop Up Assembly Adjustment check TROUBLESHOOTING GENERAL This section presents troubleshooting procedures for the QumeTrak 842 Disk Drive Aside from some application related precorditions and a few func tional prerequisites troubleshooting a QumeTrak 842 is limited to tracking down the cause of on
47. LAMP 008 A 048 Figure 29 Carrier Assembly Removal and Replacement Replacement Refer to the illustration above 1 Verify that the paper strip is present between the R W heads as instructed under Removal above 2 Insert both rear carrier screws with washers into their holes in the carrier assembly 3 Properly place the angled top ends of both carrier springs into the notched out recesses on the carrier and hold them in that position 4 While holding the spring top ends in their car recesses lift the carrier into position on the main frame casting sliding the straight lower spring ends into position in the two main frame casting recesses under the rear guide bar clamp 5 Counteract the upward spring tension slightly and first engage both rear carrier screws only a few turns in their threads in the casting then screw them in all the way but do not tighten at this time 6 Squeeze the ready off lever by hand towards the side of the carrier assembly until it clears the hook of the bail assembly when the carrier front is lowered Release the ready off lever under the bail assembly hook but do NOT release the front of the carrier assembly until the front screws are installed 7 While holding the front of the carrier assembly down against the spring tension install the two front screws and washers which secure the carrier to the door latch plate Do not tighten these screws at this time Rel
48. LOAD SOLENOID Removal Refer to the illustration below NOTE The position of the head load solenoid is relatively critical and influences the proper mechanical functioning of numerous ponents Loosen the solenoid only if ab solutely necessary 1 Remove from the disk drive unit the spindle drive belt and the bail assembly as in structed in the respective removal procedures 2 Remove the two head load solenoid leads from the J2 connector by pushing down on the solenoid lead tabs in the connector with tweezers black to J2 A1 red to J2 B1 see Connector Lead Removal illustration 3 Separate the two head load solenoid leads from the transducer cable 4 Move the head carriage assembly by hand all the way toward the spindle forward 5 Remove the two screws with captive washers which secure the head load solenoid to the solenoid bracket Access to these screws is through two holes in the side of the main frame casting 6 Remove the solenoid adjusting screw be tween the two screws which secure the solenoid bracket to the main frame casting NOTE Do not let the plunger fall out of the head load solenoid Plunger and shims are factory selected and matched to the solenoid and are not ex changeable or replaceable by themselves Always replace the solenoid as a complete assembly only 7 Remove the solenoid from the drive by drop ping it down through the cutout in the casting 3
49. NGE TRK 00 SENSOR RETURN BLACK TRK 00 SENSOR RED NOT USED NOT USED NOT USED NOT USED INDEX LED RETURN PIN_NO SIGNAL NAME INDEX LED INDEX 1 SENSOR RETURN INDEX 1 SENSOR INDEX 2 SENSOR RETURN 2 SIDED INDEX 2 SENSOR 2 SIDED STEPPER 1 KEY STEPPER STEPPER 2 STEPPER Q4 STEPPER DOOR LOCK RETURN DOOR LOCK 24V DC HEAD LOAD RETURN HEAD LOAD 24V DC Table 18 Connector P3 J3 Pin Assignments PIN NO SIGNAL NAME COLOR R W HEAD 0 R W HEAD 1 R W RETURN HEAD 0 R W RETURN HEAD 1 R W HEAD 0 R W HEAD 1 ERASE RETURN HEAD 0 TEST POINTS Available on the PCB are a number of test points in the form of wire wrap pins for easy attachment of test equipment Test point designators and signal names are identified in the table below as they are silkscreened on the PCB and called out in the schematic diagrams 20 ERASE RETURN HEAD 1 RED ERASE HEAD 0 YELLOW ERASE HEAD 1 YELLOW NOT USED KEY SHIELD HEAD 0 SHIELD HEAD 1 Table 19 Test Points signal GND PREAMP 1B PREAMP 1A PREAMP 2B PREAMP 2A INDEX ERASE READ DATA 6 VDC 17 VDC SERVICE CHECKS For the service checks in this section the disk drive interior mechanisms and the PCB must be accessible At least AC and DC power must be ap plied to the unit as specified in the Interface nections table for minimum drive operability Refer t
50. Removal and Replacement if func tional In Use LED fails to light as required with ap propriate jumper and drive operating status HEAD LOAD SOLENOID ASSEMBLY ADJUST MENT CHECK This adjustment check is to be performed after maintenance involving any one of the following assemblies carrier bail head load solenoid or head carriage Also if Read Write or Head Load difficulties arise these may be caused by a loss of proper bail gap or head gap spacings 1 Position the disk drive on a stable flat sur face interior mechanism exposed with drive motor side up PCB down Orient it as shown in the illustration below 008 051 Figure 19 Gap Check 2 Slide the head carriage assembly by hand to the end of its range of travel all the way toward the rear of the disk drive track position 3 Install a disk in the drive and close the drive door 4 Power up the disk drive 5 Load the heads against the disk this may be done by a temporary jumper installed across test points HA and GND on the PCB 6 Check the gap between the metal bail plate on the bail assembly and the plastic carriage arm tab on the head carriage assembly The gap should be within 0 020 and 0 400 inch 0 5 to 1 0 mm 7 Unload the heads from the disk MAINTENANCE 8 Slide the head carriage assembly by hand all the way to the other end of its range of travel track 76 position toward the disk spindle 9 Repeat steps
51. ULLEY ES ALIGN TOP OF DRIVE PULLEY WITH TOP OF MOTOR SHAFT FLAT SURFACE OF MOTOR SHAFT SETSCREW 008 A 024 Figure 22 Drive Pulley Installation 2 Replace the drive belt then rotate the spindle pulley counterclockwise by hand to verify that the belt is riding centered on the spindle pulley and drive pulley surfaces 3 Install the PCB outlined under PCB Removal and Installation and restore all connec tions BAIL ASSEMBLY Removal Refer to the illustrations below 1 Manually slide the head carriage assembly all the way towards the rear of the drive track 00 position 2 Cut a strip of clean paper approximately 2 X 8 in and fold it end to end to half length Through the open front door of the drive carefully insert the paper fold first into the disk slot of the head carriage assembly paper doubled over as described tends to stay in place in the slot more securely when the unit needs to be set on its side than a single straight strip of paper providing more reliable R W head protection Leave the drive door open CAUTION The R W head surfaces must not be permit ted to contact each other Be sure that the paper remains betwen the heads in the head carriage assembly disk slot throughout this procedure MAINTENANCE 3 Unhook the bail spring from the spring sup port arm on the head load solenoid 4 Remove the screw with two washers that secures the bail assembly to the disk guide ra
52. UT DROPS TO BELOW 80 OF INITIAL VALUE AS MEASURED BY USING IBM DISKETTE IBM P N 1766872 MEDIA LIFE Never leave a drive in a motor on condition with a disk partially installed INTERFACE ELECTRICAL INTERFACE GENERAL The QumeTrak 842 has three interface connec tors Conector P1 J1 interfaces digital I O signals Connector P5 J5 interfaces the 5V and 24V DC power sources The third connector PO JO interfaces the AC power source The pin assign ments for these connectors are identified in the Interface Connections illustration below SIGNAL INTERFACE All the signal interface lines are TTL compati ble and are active true when low The disk drive uses 7438 NAND buffers open collector as line drivers and 7414 Schmitt trigger inverters as line receivers The input of each receiver in a single drive or in the last drive of a daisy chain must be terminated in 150 ohms pulled up to 5 volts The illustration below shows the recommended con troller interface circuit CONTROLLER 5 V 1500 1 4 TTL 7414 or equivalent 10 Feet Max Figure 1 Recommended Controller Interface Circuits INPUT LINES There are twelve low active TTL input lines Ten of the signal lines are factory standard and two are user installable options The low true voltage level for the lines is 0 to 0 4 volts The high false voltage level is 2 4 to 5 25 volts The characteristics of the
53. Use LED leads from the J2 connector by pushing down on the LED lead tabs in the connector with tweezers black to J2 A15 red to J2 B15 see Connector Lead Removal ll lustration below 008 A 027 Figure 26 Connector Lead Removal typical 3 Separate the two In Use LED leads from the transducer cable 4 Pull the collar off the LED holder then pull the holder off the LED refer to the illustration below LED HOLDER FRONT BEZEL Figure 27 In Use Led Removal and Replacement 31 MAINTENANCE Replacement 1 Insert the LED holder from the front into the LED hole in the front bezel Slide the collar over the In Use LED and onto the wires With the holder in the front bezel hole push the LED into the holder from behind until it snaps into place Secure the LED holder by pushing the collar over the holder refer to the In Use LED Removal and Replacement illustration above 2 Route the two In Use LED leads along the transducer cable to the J2 connector 3 Install the two leads in their proper locations in the J2 connector refer to step 2 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector is plugged in 4 Plug the J2 connector into the PCB WRITE PROTECT SENSOR Removal 1 Remove the bail assembly as outlined under Bail Assembly Removal 2 Disconnect the transducer cable connector 42 from the PCB
54. ad Solenoid Removal and Replacement 38 Dust Cover Removal and Replacement 38 Head Carriage Assembly Belt Clamp Access rm 39 Steel Belt End Clamp Access 39 Steel Belt Stepper Mechanism 40 Steel Belt and Head Carriage Alignment 41 Carrier Collet Assembly Adjustment 44 Pop Up Adjustment GRO ROC 45 Bail Gap Adjustment hr rh mma 46 R W Head Gap Adjustment 47 Index Lamp Assembly Positioning 47 Stepper Motor Pulley Track 40 Aligament 48 R W Head Radial Alignment 49 Power Failure Troubleshooting Flow Chart 53 Not Ready Troubleshooting Flow 54 Seek Error Troubleshooting Flow 56 Read Error Troubleshooting Flow Chart 59 Write Error Troubleshooting Flow Chart 62 No Head Loads Troubleshooting Flow Chart 65 Illustrated Parts Locations sheets 70 QumeTrak 842 Block Diagram 76 Typical Schematic Diagram QumeTrak 842 sheets a f 77 vi LIST OF TABLES PAGE Performance 5 1 Reliability and
55. allation 2 Sided With a disk installed and the drive selected a low active level on this optional output line pin 10 indicates that a two sided disk is in use high level indicates that a single sided disk is in use Refer to the section on CUSTOMER STRAPPABLE OPTIONS for method of installa tion ALTERNATE PINS Eight alternate I O pins are provided on connector J1 for interfacing the disk drive with additional control signals These eight alternate I O pins 4 6 8 10 12 16 18 and 24 connect to PCB pads for customer installable optional jumpers Two fac tory designated input and two factory designated output lines of the drive internal circuits are selec table by installing jumpers to I O pins 10 12 16 and 18 INTERFACE FROM CONTROLLER FROM QUMETRAK 842 SIGNAL CONNECTOR P1 J1 SIDE SELECT 14 10 2 SIDED IN USE 16 12 DISK CHANGE HEAD LOAD 18 20 INDEX LOW CURRENT 2 22 READY DRIVE SELECT 1 26 42 00 DRIVE SELECT 2 28 da WRITE PROTECT DRIVE SELECT 3 30 46 READ DATA DRIVE SELECT 4 32 DIRECTION 34 STEP 36 WRITE DATA 38 RITE GATE MAME 40 4 6 8 10 12 16 18 24 SIGNAL RETURNS ALTERNATE 1 0 DC POWER CONNECTOR 5 5 24 VDC 1 24 V RETURN 2 5 VDC 5 5 V RETURN 6 AC DC MOTOR POWER CONNECTOR P0 J0 AC INPUT QUMETRAK 842 24VDC QUMETRAK 842DC 1 FRAMEGROUND QUMETRAK 842 24V RETURN QUMETRAK AC INPUT QUMETRAK 842 3 Op
56. atus signals can be monitored while the head is unloaded thereby extending the media life installation refer to the PCB Jumper Locations illustration 1 Open trace X on the programmable shunt with a small screwdriver 2 Plug trace C on the optional I O pins near con nector J1 Option 2 This option allows a drive to be selected and the stepper motor to be enabled without loading the heads As an example of this option initial reset to Track 00 at power on can be performed without the READY condition 16 Installation refer to the PCB Jumper Locations illustration 1 Open traces B and HL on the programmable shunt with a small screwdriver 2 Plug trace C on the optional I O pins near con nector J1 3 Plug trace DS on the optional pins near connector J2 Option 3 This option RADIAL READY allows a drive to load the heads without selecting the drive or enabling the stepper motor The advantage is that the heads can be kept loaded on all the drives thereby eliminating the head load time when the drive is performing a disk copy operation Installation refer to the PCB Jumper Locations il lustration 1 Open traces A and HL on the programmable shunt with a small screwdriver 2 Plug trace C on the optional I O pins near con nector J1 3 Plug trace DS on the optional pins near connector J2 SIDE SELECT OPTIONS Normally a R W head is selected by the SIDE SELECT interface
57. ble shunt with a small screwdriver 3 Jumper pad R directly below the program mable shunt to one of the available Alternate 1 0 pins 4 6 8 or 24 READY will then appear on the chosen Alternate I O pin RADIAL INDEX OPTION The INDEX line from a factory configured drive is only available to the interface when the drive is selected This option enables the user to monitor the INDEX line of each drive on the interface continuously Installation refer to the PCB Jumper Locations il lustration 1 Cut trace R1 near the center of the PCB CUSTOMER STRAPPABLE OPTIONS 2 Open trace on the programmable shunt with a small screwdriver 3 Jumper pad directly below the program mable shunt to one of the available Alternate I O pins 4 6 8 or 24 INDEX will then appear on the chosen Alternate pin IN USE OPTIONS Normally the In Use LED indicator will be energiz ed while DRIVE SELECT is active The door solenoid will be activated when DRIVE SELECT and READY are active The three options listed below will energize the In Use LED when activated to a low level Option 1 This option will turn on the In Use LED when the DRIVE SELECT or IN USE line is active Installation refer to the PCB Jumper Locations il lustration Plug trace D on the opone pins near connec tor J1 Option 2 This option will energize the In Use LED when the HEAD LOAD or IN USE line is active Installation refer t
58. corded 1F signal and note the display amplitude on the scope 11 Divide the 2F read amplitude by the 1F read amplitude Minimum acceptable ratio is 0 4 or 40 12 Select the other disk side second R W head and repeat steps 5 6 and 8 through 11 above 13 Move the scope probe from test point 1A to test point 1B and repeat the above procedure for both disk sides both R W heads 14 Unioad the R W heads from the disk 15 Remove the R W disk from the drive 16 Disconnect the oscilloscope from the disk drive If any one of the four above ratios falls below 40 the head carriage assembly needs to be replaced provided this is not caused by an in creased head gap faulty head azimuth the head lifting off the disk surface or by poor track align ment or worn media disk surface Perform R W Head Azimuth Check Head Carriage Assembly Radial Alignment check and use an alternate Cer tified R W Disk before replacing the head carriage assembly as outlined under Removal and Replacement Procedures Do NOT omit the checks and adjustments listed at the end of the replacement procedure NOTE The head carriage assembly is factory ad justed and tested In the field there must no adjustment or repair attempted on the en tire head carriage assembly READ WRITE R W HEAD AZIMUTH CHECK The R W head azimuth significantly influences the signal amplitude of recorded and of read data A head azimuth within 12 min
59. d will swing up while the front screws are removed Do NOT permit the carrier front to swing up beyond the top edge of the front bezel The R W head springs are precision preloaded and must not be flexed beyond their normal operating range as this may seriously damage them 4 Remove the two screws and washers holding the carrier assembly to the door latch plate of the front bezel 5 Remove the two screws with captive washers which secure the front bezel to the main frame casting Lift the front bezel from the drive unit Replacement 1 Install the front bezel assembly on the main frame by securing it with two screws with captive washers 2 Mount the front of the carrier assembly against the door latch plate using two screws with washers Do not tighten the screws at this time 3 Install the In Use LED in the front bezel assembly insert the LED holder from the front in to the LED hole in the front bezel slide the collar Over the LED and onto the wires with the holder in the front bezel hole push the LED into the holder from behind until it snaps into place secure the LED holder by pushing the collar over the holder refer to the In Use LED Removal and Replace ment illustration 4 Install the door lock solenoid on the front bezel as outlined under Door Lock Solenoid Replacement above 5 Proceed through Drive Door and Carrier Assembly Alignment as outlined under Adjustments MAINTENANCE HEAD
60. d by using the Alternate 0 pins The table below shows the configuration of the option traces when the disk drive is shipped from the fac tory The illustration on the next page shows the location of the jumpers traces and Alternate I O pads the CAUTION Modifying a drive by cutting or soldering PCB traces may void the warranty Consult your Qume representative Table 12 Factory Configuration of the Option Traces 051 054 DRIVE SELECT ADDRESS PINS UP TO 4 DRIVES RADIAL HEAD LOAD _ IN USE FROM DRIVE SELECT ALTERNATE INPUT IN USE IN USE FROM HEAD LOAD DOOR LOCK LATCH RADIAL READY RADIAL INDEX DRIVE ADDRESS SELECT UP TO 8 DRIVES D1 D2 D4 DDS 1 4 TWO SIDED DRIVE SELECT 1 3 HEAD SELECT OPTION T40 TEST TRACK 40 TEST ACTUATE HEAD LOAD 4 6 8 10 ALTERNATE I O PINS 12 16 18 24 H i 1 1 1 1 H i i i STEPPER POWER FROM HEAD LOAD ALTERNATE OUTPUT READY PAD ALTERNATE OUTPUT INDEX PAD ALTERNATE INPUT HEAD LOAD ALTERNATE OUTPUT DISK CHANGE ALTERNATE OUTPUT 2 SIDED DISK STEPPER POWER FROM DRIVE SELECT INHIBIT WRITE WHEN WRITE PROTECT ALLOW WRITE WHEN WRITE PROTECT FROM FACTORY 1 DS2 DS3 DS4 13 CUSTOMER STRAPPABLE OPTIONS No lt o o o eo 0 Lo R32 Dors Bonos a 3 gt 9186 Transducer
61. d then true again after a different disk has been installed Installation refer to the PCB Jumper Locations illustration Plug trace DC on the optional I O pins near con nector 1 False DRIVE SELECT True False READY True DISK CHANGE False Door Open Figure 18 Disk Change Timing 2 SIDED Alternate Output A low level on this line indicates that a two sided disk is in use a high level indicates a single sid ed disk being used Installation refer to the PCB Jumper Locations illustration Plug trace 2 on the optional pins near con nector J1 MAINTENANCE PREVENTIVE MAINTENANCE The QumeTrak 842 drive should be cleaned every six months as outlined below This interval assumes a reasonably dust free environement In use keep the disk drive as free from dirt as possi ble Place the unit in a clean plastic bag or seal able box when not in use for prolonged periods general service check should be performed on the QumeTrak 842 every 6000 power on hours Include in this check inspecting for loose compo nents and connectors Re tighten loose screws but be careful not to change the setting of adjust ment screws especially in the Head Carriage Assembly and the Carrier Assembly areas Inspect the Spindle Drive Belt 50025 01 and replace it if any evidence is found of fraying cracking or otherwise weakened areas Perform the checks outlined under Service
62. der E washer spring padded washer with cushion facing spring 2 Assemble hook assembly and solenoid by in serting hook pin refer to the Door Lock Solenoid illustration 3 With the three springs in place large spring in the center install the solenoid hook assembly on the front bezel Secure the assembly with two screws with washers 4 Route the two door lock solenoid leads along the transducer cable to the J2 connector 36 5 Install the two leads in the J2 connector refer to step 2 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector is plugged in 6 Plug the J2 connector into the PCB FRONT BEZEL ASSEMBLY Removal Refer to sheet b of the Illustrated Parts Locations drawings for identification of items and locations mentioned below 1 Release the door lock solenoid assembly from the front bezel by removing two screws with washers Be careful not to lose any of the three springs see Door Lock Solenoid illustration 2 Release the In Use LED from the front bezel assembly pull the collar off the LED holder then pull the holder off the LED refer to the In Use LED illustration 3 Tie down the front of the carrier assembly towards the main frame casting using some wire or string so that the drive door is in approximately half open position CAUTION The carrier assembly is spring loaded an
63. drive operation is detected do not attempt to operate the disk drive Contact Qume for advice and instructions When repacking the disk drive for shipping or storage use original packing material only and follow the above instructions in reverse order MOUNTING MECHANICAL DIMENSIONS Shown below are the top and side views of the disk drive The mounting and clearance dimen sions should be reviewed before installation 8 32 UNC x 25 Dp 4 places Dimensions in inches 48 32 UNC 25 Dp 3 places both sides Mounting Locations 4 55 5 03 2 49 2 40 06 804 04 4 00 02 Figure 15 QumeTrak 842 Side View Dimensions in inches 11 INSTALLATION RECOMMENDATIONS The QumeTrak 842 can be mounted in any plane loading or vertically for top loading However horizontally for front loading vertically for front when the disk drive is mounted in a horizontal front loading position it must be oriented such that the In Use LED indicator on the front bezel is below the front door as shown in the illustration INSTALLATION REQUIREMENTS ly Installed POE down 6 The QumeTrak 842 has certain power environ mental and mechanical requirements Review the Figure 16 Disk Drive Mounting table below before installing the disk drive Table 11 Installation Requirements CURRENT 100 115 100 115 10 0 8 START UP INSTALLATIONS 50 60 HZ 1
64. e cut out on the mainframe positioning the sensor to the right against the mainframe refer to the illus tration below Secure the sensor with a large washer and screw PUSH SENSOR AGINST MAINFRAME sio INDEX SENSOR ASSEMBLY MAINFRAME 022 A 01 Figure 28 Index Sensor Assembly Replacement 2 Route the four index sensor leads along the transducer cable to the J2 connector 3 Install the four leads in the J2 connector refer to step 2 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector is plugged in MAINTENANCE 4 Plug the J2 connector into the PCB 5 Perform Index Lamp amp Sensor Alignment Check as outlined under Service Checks INDEX LAMP ASSEMBLY Removal 1 Disconnect the transducer cable connector J2 from the PCB 2 Remove the two index lamp leads from the J2 connector by pushing down on the lamp lead tabs in the connector with tweezers black to J2 A8 red to J2 B8 refer to the Connector Lead Removal illustration 3 Separate the two index lamp leads from the transducer cable Note the routing of the leads from the cable along the carrier assembly to the index lamp 4 Remove the two screws with captive washers which secure the index lamp assembly to the car rier assembly Remove the assembly Replacement 1 Install the index lamp assembly on the carrier by tightening the two screws
65. e of the following basic malfunctions Not Ready Seek Error Read Error Write Error No Head Load Troubleshooting of these malfunctions is pre sented in flowchart format Reference by title is made in the flowcharts wherever one of the Ser vice Checks or Adjustments sub routines applies DEFINTION OF MALFUNCTION TERMS 1 NOT READY the controller does not receive an expected READY signal from the disk drive 2 SEEK ERROR the disk drive is unable to ac cess a designated disk side or track or to confirm Track 00 access to the controller 3 READ ERROR the disk drive unit is unable to recover properly data previously stored on a disk 4 WRITE ERROR the disk drive unit is unable to record properly a data sequence on the disk 5 NO HEAD LOAD the R W heads are not load ed against the disk surface when required PREREQUISITE CHECKS 1 Eliminate the possibility of the disk being the cause of malfunction e Verify that the malfunction at hand is not caused by a disk incompatible with the overall system e verify that the disk is inserted into the drive facing the right way i e with the label on the disk jacket facing toward the front door facing away from the In Use LED on the front panel e use another disk known to have good data recorded on it to determine whether a soft ora hard error has occurred Soft disk errors are temporary or recoverable reading errors They are typically cau
66. ease the carrier front CAUTION The carrier assembly is spring loaded and will swing up while the front screws are removed Do NOT permit the carrier front to swing up beyond the top edge of the front bezel The R W head springs are precision preloaded and must not be flexed beyond their normal operating range as this may seriously damage them 8 As applicable install or connect the index lamp assembly refer to step 2 of the Removal pro cedures above 9 Push the carrier assembly towards the back of the drive and tighten the rear carrier screws Verify that the plastic ends on the door latch plate do not bind against the guide tabs on the inside of the front bezel when the door is opened and closed 10 Proceed through Drive Door and Carrier Assembly Alignment as outlined under Adjustments 11 Proceed through Pop Up Assembly Adjust ment as outlined under Adjustments MAINTENANCE 12 Perform R W Head Gap Adjustment as out lined under Adjustments 13 Perform Index Lamp Alignment as outlined under Adjustments POP UP ASSEMBLY Removal Refer to sheets b and c of the Illustrated Parts Locations drawings for identification of items and locations mentioned below 1 With the drive door open remove the two screws with captive washers which secure the pop up assembly to the main frame casting 2 Lift the pop up assembly up until the peg on its underside between the screw holes clears the main frame cas
67. eat steps 6 and 7 above 9 Unload the R W heads and remove the CE disk 21 MAINTENANCE Only if the index timing is outside the above tol erance slightly loosen the screw that secures the index sensor assembly to the mainframe and ad just the index sensor postion to obtain the speci fied timing tighten the index sensor assembly mounting screw TRACK 20 SENSOR ASSEMBLY SERVICE CHECK 1 Move the head carriage assembly by hand all the way against the stop at the rear of the drive away from spindle This positions the heads at track 00 2 Power up the disk drive 3 Between PCB connector J2 pin B11 and GND check for 5V 5 If this voltage is outside the stated tolerance replace the PCB as outlined under Printed Circuit Board Removal and Replacement 4 Check for 1 0 to 1 7V between PCB test points B12 and GND 5 Check for 0 to 0 3V between PCB test points A11 and GND 6 Power down the disk drive 7 Move the head carriage assembly by hand all the way toward the disk spindle 8 Power up the disk drive 9 Check for 4 0 to 5 25V between PCB test points A11 and GND 10 Ifany of the voltages measured in steps 4 5 4 9 of the above procedures are outside the stated limits replace the track 00 sensor assembly as per Track 20 Sensor Assembly Replacement in structions WRITE PROTECT SENSOR ASSEMBLY SERVICE CHECK 1 Power up the disk drive 2 Between PCB connector J2 pin B13 and GND c
68. ely 1 5 X 6 in and fold it end to end to half length 2 Through the open drive door insert the paper fold first from the front into the disk slot of the head carriage assembly see Bail Assembly Removal and Replacement illustration CAUTION The R W head surfaces must not be permit ted to contact each other Be sure that the paper remains between the R W heads in the head carriage assembly disk slot throughout this procedure 42 3 Close the disk drive door 4 Proceed through Printed Circuit Board Removal as outlined above 5 Remove the spindle drive belt as instructed above 6 Release the head carriage cable from the main frame casting one place 7 Move the head carriage assembly by hand so that the steel belt head carriage clamp screws line up with the access slot in the side of the main frame casting approximate Track 40 Position see Head Carriage Assembly Belt Clamp Access illustration 8 Through the access slot in the main frame casting remove the two screws with captive washers and the clamp plate to release the head carriage assembly from the steel belt 9 Turn the idler roller by hand clockwise to posi tion the pulling tab on the steel belt toward the rear of the drive to the end of its range of travel Track 00 position 10 Slide the head carriage assembly by hand toward the front of the drive to the end of its range of travel NOTE Always handle the head car
69. equency Modulation FM 5 Write Data Timing for Modified Frequency Modulation MFM 5 Index TIMING CR OP d Rd 5 Read Data Timing for Frequency FM cres tix VIE 6 Interface Connection 7 Interface Connection CR 8 J1 Connector Dimensions component side TUE T 8 Unpacking the Disk 10 QuemTrak 842 Top View 11 QumeTrak 842 Side View 11 Disk Drive MOUNTING ARA 12 PCB Jumper Locations Test Points amp Connector Pin Assignments 14 Disk Change 18 Check 23 Head Load Time Check 24 Checo suy o saa u wau DOR IO RORIS ACA sen 27 Drive Pulley 28 Bail Assembly Removal and Replacement 29 Bail Assembly Re Installation 30 Drive Motor Assembly Removal and Replacement 30 Connector Lead Removal typical 30 In Use LED Removal and Replacement 30 Index Sensor Assembly Replacement 33 Carrier Assembly Removal and Replacement 34 Door Lock Solenoid Removal and Replacement 36 Head Lo
70. evolutions by a properly inserted disk with the drive door closed READY will go true only if the proper side 0 is selected when a one sided disk is used Refer to the sec tion on CUSTOMER STRAPPABLE OPTIONS for alternate use of READY Track 00 low active level on this line pin 42 in dicates that the R W head is positioned at Track 00 Write Protect low active level on this line pin 44 indicates that a disk with an ISO write protect notch is loaded Under normal operation the drive will inhibit writing when a protected disk is install ed Refer to the section on CUSTOMER STRAP PABLE OPTIONS for alternate operation Read Data Data from the disk is output to the host system in the same form as it was received 4 00 us Nom C Leading Edge of Bit Can Be 350 ns From Nominal D Leading Edge of Bit Can Be 175 ns From Nominal Figure 9 Read Data Timing for Frequency Modulation FM on the write data line Each flux reversal that is sensed on the disk produces a low active pulse on the READ DATA line pin 46 The timing char acteristics for READ DATA are shown Disk Change A low active level on this optional output line pin 12 indicates that the disk drive door has been opened and the disk ejected after the DRIVE SELECT signal has gone false The DISK CHANGE circuit is reset after the DRIVE SELECT signal goes true then false again Refer to the section on CUSTOMER STRAPPABLE OP TIONS for method of inst
71. ext table lists the reliability specifications WARRANTY SERVICE AND TRAINING WARRANTY AND SERVICE The basic Qume service policy terms conditions and prices for repairs are specifically described in Memory Products Service and Spares Catalog publication number 37032 For specific warranty details refer to your QumeTrak 842 purchase contract CAUTION TRAINING Qume offers two types of customer training on the QumeTrak 842 Disk Drives regularly sche duled classes held at Qume facilities and custom on site training held at the customer s facility All classes cover mechanical and electronic theory of operation field and depot service level trouble shooting subassembly removal and replacement procedures mechanical and electronic adjust ments service checks and preventive mainte nance Detailed information on customer training classes is contained in Memory Products Service and Spares Catalog publication number 37032 Table 2 Reliability and Maintenance ERROR RATE ONE ERROR PER 109 BITS READ RECOVERABLE READ ERROR RATE ONE ERROR PER 1012 BITS READ NON RECOVERABLE READ ERROR RATE ONE ERROR PER 10 SEEKS 8500 HOURS AT 100 DUTY CYCLE 13000 HOURS AT 50 DUTY CYCLE MTTR 30 MINUTES SEEK ERROR RATE MTBF PREVENTIVE MAINTENANCE 6 000 POWER ON HOURS OR 2 YEARS DESIGN LIFE 15 000 POWER ON HOURS OR 5 YEARS 3 5 x 108 PASSES TRACK USEFUL MEDIA LIFE IS EXCEEDED WHEN HEAD OUTP
72. f a following STEP pulse The logic state of DIRECTION cannot be changed during the positive going transition of STEP or within the one microsecond preceding the positive going transition of STEP INTERFACE DC POWER DRIVE SELECT DIRECTION Figure 2 Track Access Timing AC MOTOR POWER QUMETRAK 842 DC MOTOR POWER 2 sec min QUMETRAK 8420 DC POWER DRIVE SELECT min SIDE SELECT mI EE STEP 500 us min A 38 ms min zm 90 ms min 100 us min Figure 3 Read Timing WRITE GATE AC MOTOR POWER QUMETRAK 842 DC MOTOR POWER QUMETRAK 84200 DC POWER pe 2 sec min DRIVE SELECT 35 ms min 590 us min SIDE SELECT SS cur x E ee 100 min STEP 55 WRITE GATE WRITE DATA Figure 4 Write Timing Step The negative going edge of the STEP pulse on this line pin 36 will cause the R W head to be moved one track The direction of movement is controlled by the DIRECTION line The pulses plied to the STEP line have the timing characteristics shown below 3 ms min 1 us min Figure 5 Step Timing Write Data On this input line pin 38 arrives the data to be written on the disk Each transition from a high level to a low active level on this line causes the write current through the head to be reversed The WRITE DATA timing characteristics for Frequency Modula
73. f a single drive or of the last drive only a daisy chain Figure 13 Unpacking the Disk Drive 381 A INSTALLATION RECEIVING AND INSPECTION Each disk drive is shipped in an individual con tainer protected by a layer of foam packaging Unpack and inspect the disk drive as follows refer to the illustration on the preceding page 1 Inspect the container for external signs of damage If any damage is observed have the delivery agent note the damage on the shipping document Some shippers may wish to be present when the container is opened if external damage is apparent 2 Open the container and remove the disk drive 3 Remove the plastic bag surrounding the disk drive 4 Remove the piece of foam from between the carrier and the bail assembly 5 Remove the cardboard square inserted in the front panel 6 Retain all packing materials for possible reshipment 7 Inspect the disk drive for scratches dents loose or damaged parts or other signs of damage Note any evidence of such damage on the invoice and file a claim with the carrier immediately if the condition of the unit so warrants 8 Inspect the interior of the entire unit Look for loose or broken parts evidence of electrical dam age or other signs of damage 9 If the drive will not be used for some time it is advisable to place the cardboard insert back into the drive after completing inspection 10 If damage that might impair
74. flow charts presented in this Troubleshooting Section are based on Factory Configuration of the QumeTrak 842 unit as listed under Customer Strappable Options in this manual unless speci fically stated otherwise When troubleshooting identify the programmable functions status of the defective drive unit by comparing the drive s PCB jumpers to jumper tables Factory Configuration of Option Traces Programmable Shunt Trace Functions Drive Select Options and Head Select Options Also refer to the illustration PCB Jumper Locations Test Point 8 Connector Pin Assignments for rapid identification of PCB locations Deviation from Factory Configuration may in some cases result in drive performance significantly different from that stated in the troubleshooting flow diagrams 51 MAINTENANCE For troubleshooting the disk drive unit must be fully energized with its PCB and drive mechanisms accessible pre recorded disk with known good system data and or a Qume CE alignment disk QUME P N 50235 02 or 50236 01 is required POWER TEST 1 Check for presence of AC power at connector JO across pins 1 and 3 AC potentials and tolerances are stated in table Installation Re quirements in the Installation section Refer to il lustration PCB Jumper Locations Test Points and Connector Pin Assignments 2 Check DC potentials as listed below use multimeter and scope as required To locate measurement points refer to illu
75. heck for 5V 5 22 If this voltage is outside the stated tolerance replace the PCB as outlined under Printed Circuit Board Removal and Replacement 3 Check for 1 0 to 1 7 between PCB test points B14 and GND 4 Check between PCB test points A13 and GND for 4 0 to 5 25V without a disk and the drive door closed and for 0 to 0 3 with an unprotected disk no write protect notch installed and the door closed 5 Remove the disk 6 If any of the voltages measured in steps 3 4 4 are outside stated limits replace the write protect sensor assembly as per Write Protect Sensor Assembly Replacement instructions IN USE LED SERVICE CHECK 1 Power up the the disk drive 2 Check for 5V 5 between PCB test points B15 and GND If this voltage is not present replace the PCB as outlined under Printed Circuit Board Removal and Replacement 3 Temporarily connect a jumper from PCB con nector J2 pin A15 to GND The In Use LED should light up Remove the jumper If the LED fails to light replace it as per In Use LED Removal and Replacement instructions 4 If the LED checks out OK in step 3 above but fails to light during normal drive use with a disk in stalled and the drive door closed refer to tables Factory Configuration of Options Traces and Pro grammable Shunt Trace Functions and determine PCB jumper status with respect to In Use LED function 5 Replace the PCB as outlined under Printed Circuit Board
76. hile working with it 2 Remove the dust cover from over the stepper motor pulley after removing the two screws with captive washers HEAD CARRIAGE ASSEMBLY IN TRACK 40 POSITION STEEL CLAMP ETS SLIDER m Re BH mm IDLER ASSEMBLY Of 4 o o STEEL BELT STEPPER MOTOR FLANGE ACCESS SLOT MAIN FRAME 008 A 044 Figure 33 Head Carriage Assembly Belt Clamp Access MAINTENANCE 3 Move the head carriage assembly by hand 0 that the steel belt carriage clamp screws line up with the access slot in the side of the main frame casting this is approximate Track 40 Position 4 Using the access slot in the side of the main frame casting remove the two screws with cap tive washers and the clamp plate which secure the steel belt Note orientation of the clamp plate properly oriented the rounded clamp plate edges must face the steel belt 5 Push the slider on the idler assembly forward against the tension spring Insert a short Phillips screwdriver into the now exposed hole in the main frame casting This maintains the slider in for ward position with the tension released from the steel belt CAUTION Do not let the tip of the screwdriver contact the printed circuit board directly below PULLEY STEEL BELT CLAMP CLAMP SCREW ACCESS SLOT IN MAIN FRAME 008 A 043 Figure 34 Steel Belt End Clamp Acces
77. il 5 Tilt the bail assembly up from the bail base slide it towards the side wall of the main frame casting and remove it from the drive after the metal bail plate clears the plastic carriage arm tab NOTE Do not remove the head load solenoid plunger Solenoid solenoid plunger and shims are factory selected and matched They should not be separated and must be replaced as a complete assembly only HEAD LOAD SCREW WITH WASHER Pd WASHER lt lt BAIL ASSEMBLY BAIL BASE 2 SPRING BACK STOP SPRING 82 A is lt CARRIAGE 33 23 2 E lt ARM TAB 008 A 025 Figure 23 Bail Assembly Removal and Replacement Replacement Refer to the illustrations above and below 1 Manually place the head carriage assembly in track 00 position all the way towards the rear of the drive 2 Close the drive door 3 Lift the solenoid plunger by about 1 2 inch and hold it there 4 Insert the bail assembly from the side of the drive at a tilt so that the bail hook engages the plunger cross pin the back stop spring is under the bail adjustment screw and the shelf with the metal bail plate rests under the carriage arm tab but on top of the head carriage assembly 5 Secure the bail assembly to the bail base with a screw with two washers Verify that the solenoid plunger is not binding in any way verify that the bail assembly is moving freely and has slight sideways
78. individual input lines are described below Drive Select 1 4 A low active level on the ap propriate line pin 26 28 30 or 32 enables com munication between the individual drive and the controller When two or more up to four drives are daisy chained each drive must have a unique DRIVE SELECT address The DRIVE SELECT dress is controlled by jumpers DS1 through DS4 When the two pins of jumper DS1 are connected the drive will be activated by an active low signal on the DRIVE SELECT 1 line If the two pins of jumper DS2 are connected the drive will be active when DRIVE SELECT 2 line is low active The same system applies to jumpers DS3 and DS4 Refer to the table below Table 3 Drive Selection Traces Drive Select Input Drive Number Only one jumper can be connected within a single drive Each drive within a daisy chain must have a unique DRIVE SELECT number Direction This line pin 34 defines the direction of R W head movement when the STEP line is pulsed A low level on this line causes the head positioning mechanism to move the R W head toward the center of the disk With the Direction line at a high level a pulse on the STEP line causes the head positioning mechanism to move the R W head away from the center of the disk The logic state of DIRECTION can be changed at any time after the trailing positive going edge of the STEP pulse and to within one microsecond before the trailing edge o
79. ives to be multiplexed together The four DRIVE SELECT lines are to be used for addressing the drive DRIVE SELECT 1 is used to enable the DRIVE SELECT 2 binary 1 DRIVE SELECT 3 binary 2 and DRIVE SELECT 4 binary 4 address lines The logical drive assignment is accomplished by pro perly jumpering traces D1 D2 and D4 where D1 binary 1 D2 binary 2 and D4 binary 4 The jumper pads are arranged to appear as a 3X3 matrix Within each column the center pad must be jumpered to an adjacent Logical 1 or Logical 0 pad The proper jumpers for each drive select number are shown in the table below 15 CUSTOMER STRAPPABLE OPTIONS Installation refer to the PCB Jumper Locations Test Points and Connector Pin Assignments il lustration 1 Add a 74L85 4 bit comparator IC PCB loca tion 1K 2 Jumper trace DDS 3 Unplug trace DS1 DS4 4 Properly jumper traces D1 D2 and D4 Fable 14 Multiplexed Drive Select Options DRIVE DRIVE SELECT INPUT NUMBER 1 2 3 4 JUMPER CENTER PAD TO 01 02 04 rs O O O att OOOO L L L L L L L L L LOW LEVEL H HIGH LEVEL HEAD LOAD OPTIONS When a factory configured drive is selected its heads are loaded and the stepper motor is energized Three other options are available Option 1 This option allows a drive to be selected without loading the heads or enabling the stepper motor The advantage is that the output st
80. k 842 s and describes the electrical interface lines INSTALLATION provides inspection unpacking mounting and warranty and servicing informa tion CUSTOMER STRAPPABLE OPTIONS de scribes the available customer strappable options and possible configuration modifications MAIN TENANCE provides preventive maintenance infor mation removal and replacement procedures adjustment instructions and troubleshooting procedures NOTE this manual the media will be referred to as simply a disk DESCRIPTION General The QumeTrak 842 s are low cost direct access data storage devices that utilize a standard removable eight inch flexible IBM diskette or equivalent as storage medium They are capable of supporting either IBM 3740 single density format FM or IBM System 34 dou ble density format MFM including double sided recording The functional electrical and mechani cal requirements of the interface conform to ANSI American National Standards Institute standard They also provide both electrical and physical interface compatibility with the Shugart SA850 Disk Drive QumeTrak 842 s have a two sided head carriage assembly containing two proven ceramic read write R W heads and a flexured mounting arrangement that results in extremely high relia bility Fast access time 8ms track to track is Table 1 Performance Specifications CAPACITY PER DISK UNFORMATTED IBM FORMAT RECORDING DENSITY TRACK NO 76
81. ley so that the screw which secures the steel belt ends to the pulley is accessible through the slot in the right side of the main frame casting Tighten the clamp screw 5 Position the head carriage assembly so that the belt clamp screw holes line up with the ac cess slot in the side of the main frame casting ap proximate Track 40 Position 6 By turning the stepper motor pulley carefully align the holes in the steel belt tab to be centered over the threaded holes in the head carriage assembly 7 Secure the steel belt to the head carriage assembly with the clamp plate and two screws with captive washers STEEL BELT mm 77 ROUNDED EDGES FACING STEEL BELT 008 A 046 Figure 36 Steel Belt and Head Carriage Alignment NOTE Be sure to have the side of the clamp plate with the rounded edges come to lie against the steel belt This avoids stressing or warp ing the belt which might be caused if the clamp plate s cutting burr is pressed against the belt 8 Perform Head Carriage Assembly Radial Alignment as outlined under Adjustments 9 Install the dust cover over the stepper motor pulley as outlined under Dust Cover and Wiper Replacement 10 Install the pop up assembly as outlined under Pop Up Assembly Replacement perform Pop Up Assembly Adjustment check IDLER ASSEMBLY Removal 1 Move the head carriage by hand all the way forward towards the drive door track 76 position 2 Push
82. line in a daisy chain system of up to four drives Two options are available Side Select From Direction Line This option allows both SIDE SELECT and DIREC TION to be multiplexed on the same DIRECTION line By cutting trace S2 and jumpering trace S1 near connector J1 refer to the PCB Jumper Loca tions illustration head selection is controlled by the DIRECTION line DIRECTION can be used in this way because it is not being used during reading or writing STEP must accompany DIREC TION to initiate head movement Side Select From Drive Select Lines This option uses the existing DRIVE SELECT lines to address up to two double sided drives It selects up to four sides as if the sides were separate drives Installation refer to the PCB Jumper Locations il lustration Cut trace 52 and jumper trace 3 The disk sides are then selected according to the table below Table 15 Side Select Options DRIVE HEAD 5 ae ts ee _NUMBER SELECT 1 2 3 4 TRACES PLUG DS1 JUMPER B2 PLUG DS3 JUMPER B4 L LOW LEVEL H HIGH LEVEL RADIAL READY OPTION The READY line from a factory configured drive is only available to the interface when the drive selected This option enables the user to monitor the READY line of each drive on the interface con tinuously Installation refer to the PCB Jumper Locations illustration 1 Cut trace RR near the center of PCB 2 Open trace R on the programma
83. ly has been replaced or if disk drive to drive com patibility disk exchangeability problems arise check the index lamp and sensor alignment as outlined 1 Verify that the pointer on the front of the index lamp assembly and the timing line on the index sensor assembly line up exactly when the drive door is closed 2 Power up the drive 3 Insert a CE disk QUME P N 50235 02 or 50236 01 4 Load the R W heads against the disk and step to track 01 5 Set up a dual trace oscilloscope Tektronix 465 or equivalent Connect channel 1 to PCB test point 1 connect channel 2 to PCB test point 1B connect scope ground to PCB test point GND set vertical deflection for both channels to 50mV division I set both inputs to AC add channels 1 and 2 connect the external scope trigger probe to PCB test point 3 INDEX set trigger source to external select normal trigger mode select AC trigger coupling set horizontal sweep to 100 usec division trigger on the leading edge of the index pulse e 6 Observe the timing between the start of a sweep and the first peak of the index burst 125 5 transitions of 1F data lt should be 500 usec 500usec for CE disk QUME 50235 02 or 250usec 100usec for CE disk QUME P N 50236 01 7 Step to track 76 and verify the same timing as observed above between the start of a sweep and the first peak of the index burst 8 Select the other disk side and rep
84. motor leads from the transducer cable and release them from the main frame two places 4 Remove the pop up assembly as outlined under Assembly Removal 5 Remove the dust cover from over the stepper motor pulley after removing the two screws with captive washers CAUTION Be careful not to kink the steel belt while working with it 41 MAINTENANCE 6 Proceed through Steel Belt Removal as out lined above 7 Remove from the underside of the main frame casting the two screws with captive washers which secure the stepper motor Lift the motor out through the top of the drive Replacement 1 Install the stepper motor assembly on the main frame and loosely secure it with two screws with captive washers Do not tighten the screws at this time 2 Secure the stepper motor leads to the main frame two places and route them along the transducer cable to the J2 connector 3 Install the five leads in the J2 connector refer to step 2 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector is plugged in 4 Plug the J2 connector into the PCB 5 Install the steel belt as instructed under Steel Belt Replacement perform Head Carriage Assembly Radial Alignment as outlined under Ad justments at the end of the steel belt installation HEAD CARRIAGE ASSEMBLY Removal t Cut a strip of clean paper approximat
85. nd Replacement illustration 4 Place the ends of both guide rails into posi tion on their blocks on the main frame casting 5 Swing the guide bar clamps 2 into position atop the guide rail ends and tighten their screws MAINTENANCE while making sure that the head carriage assembly slides freely on the guide rails CAUTION Do not kink or bend the steel belt by bumping into the pull tab while sliding the head car riage assembly back and forth 6 Re install the spindie drive belt and the PCB as outlined in the applicable instructions 7 Proceed through all applicable steps outlined under Steel Belt Replacement to properly secure the steel belt to the head carriage assembly CAUTION To avoid damage to the drive closely adhere to the detailed steel belt installation instructions 8 Perform Head Load Solenoid Adjustment Check outlined under Service Checks before pro ceeding through the Head Carriage Assembly Radial Alignment as instructed at the end of the steel belt installation 9 Perform Head Carriage Assembly Radial Alignment as outlined under Adjustments 10 Perform R W Head Read Amplitude Check and R W Head Azimuth Check as outlined under Service Checks 43 MAINTENANCE ADJUSTMENTS The adjustments outlined in this section typically apply after replacement of subassemblies and restore the disk drive to performance within specifications Periodic adjustments are not re quired unde
86. nd repeat steps 7 and 8 above 10 Disconnect the oscilloscope from the disk drive remove the prerecorded disk restore the PCB jumper status as required for system opera tion if the head load time of 35 ms is exceeded on either disk side check for a binding solenoid plunger binding bail hinge or improperly ad justed gap head if none of these are the cause the head carriage assembly may need to be replaced R W HEAD READ AMPLITUDE CHECK 1 Power up the disk drive 2 Verify good track alignment refer to R W Head Track Alignment 3 Insert a good quality Qume Certified R W Disk P N 50151 01 4 Select a disk side and load the R W heads on to the disk 5 Step to track 76 and write a 2F data signal all 4 0 6 Read the just recorded 2F signal 7 Connect an oscilloscope e g Tektronix model 465 or equivalent e Vertical input probe channel 1 to test point 1 ethe probe ground to the ground GND test point on the PCB eset vertical deflection to 50 mV division eselect AC input eset the trigger source to internal eset the trigger mode to normal eselect DC trigger coupling eset the horizontal sweep to 0 5 msec divi sion etrigger on the channel 1 input signal 8 Note the amplitude of the displayed read signal it should be at least 100 mV pp if the R W disk is good MAINTENANCE 9 Write data all 0 on track 76 10 Read the just re
87. nded Spare Parts Depot Level NUMBER OF DISK DRIVES DESCRIPTION PIN 50 100 250 500 1000 NUMBER OF SPARE PARTS IN USE LED 50096 01 WRITE PROTECT SENSOR 50007 01 TRACK 00 SENSOR 50006 01 INDEX SENSOR 50008 01 o mb INDEX LAMP 50061 01 DRIVE BELT _ 50025 01 ASSEMBLY 50147 01 HEAD CARRIAGE ASSEMBLY 50011 02 STEEL BELT 50028 01 o O N STEPPER MOTOR 50009 01 POP UP ASSEMBLY 50018 01 BAIL ASSEMBLY 50014 02 HEAD LOAD SOLENOID ASSEMBLY 50012 03 HOOK ASSEMBLY i 50094 01 DOOR LOCK SOLENOID 50091 01 MOTOR PULLEY 50 HZ ID GROOVE 50020 01 MOTOR PULLEY 60 HZ NO GROOVE 50020 02 DRIVE MOTOR AC 115 V 50004 01 DRIVE MOTOR AC 230 V 50004 03 FRONT PANEL ASSEMBLY WHITE 50019 01 FRONT PANEL ASSEMBLY BLACK 50019 02 O O O O O N A COLLET ASSEMBLY 50060 01 N N N 9 N N N IDLER ASSEMBLY 50010 01 O O O O O O O O O O O N o o o CARRIER ASSEMBLY 50013 02 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PROGRAMMABLE SHUNT 55089 08 68 DIAGRAMS J3 PCB Power Connector J5 Spindle Drive Belt Head Connector J3 Transducer Actuator Connector J2 Spindle Drive Pulley AC Power Connector J Figure 50a Illustrated Parts Locations 70 DIAGRAMS Pop Up Setscrew Carrier Assembly 9 N Spring Ends 2 INN Ready Off Lever
88. nels to 50mV div set both inputs to invert channel 2 e add channel 1 to channel 2 e set the horizontal sweep to 20ms div attach an external trigger to test point 3 INDEX on the PCB and set the trigger source to external set the trigger coupling to AC and the trigger mode to external NOTE Before using the CE disk allow a minimum of 30 minutes for the disk to adapt to the am bient temperature in which it is to be used MAINTENANCE CAT EYES LOBE PATTERN ON TRACK 40 USING QUME CE DISK LEFT LOBE 1 ABOUT 60 OF RIGHT LOBE RIGHT LOBE 1 ABOUT 60 OF LEFT LOBE 008 054 Figure 43 R W Head Radial Alignment 49 MAINTENANCE 7 Insert Qume certified CE alignment disk in the drive and close the drive door 8 Load the R W heads onto the CE disk and select a disk side CAUTION Do not record on the CE disk Recording on the CE disk will render it useless for align ment checks A write protect notch has been placed in the disk jacket to reduce the possibility of accidental recording 9 Using the trigger slope level control syn chronize the scope to obtain from the R W head of the selected side the cat eyes display shown in the R W Head Alignment illustration The oscilloscope will display two amplitude lobes The R W head is correctly aligned when the lobes are equal in amplitude or at least within 80 percent of each other refer to the R W Head Radial
89. o the Illustrated Parts Locations drawings for identification of sub assemblies Refer to the PCB Jumper Locations Test Points amp Connector Pin Assignments illustration for iden tification of PCB locations INDEX LAMP ASSEMBLY SERVICE CHECK 1 Power up the disk drive 2 Check for 2 0 to 3 4V between PCB test points B8 and GND 3 lf the voltage measured is above 3 4V replace the index lamp assembly as outlined under Index Lamp Removal and Replacement 4 If the voltage measured is below 2 0 per form Power Failure Troubleshooting Routine as outlined in the Troubleshooting section INDEX SENSOR ASSEMBLY SERVICE CHECK 1 Power up the disk drive 2 Between PCB connector J2 pin B7 and GND and J2 pin B6 and GND check for 5V 5 3 Between PCB test points A7 and GND check for 4 0 to 5 25V without a disk installed and the drive door closed and for 0 to 0 3V with a disk installed upside down so that the index hole cannot line up with the index lamp and sensor and the door closed 4 Check betwen PCB test points A6 and GND for the same voltages and under the same condi tions described in step 3 above 5 Remove the disk 6 If any of the voltages measured in steps 2 3 and 4 are outside the stated limits replace the in dex sensor assembly as per Index Sensor Removal and Replacement instructions MAINTENANCE INDEX LAMP amp SENSOR ALIGNMENT CHECK After an index sensor or an index lamp assemb
90. o the PCB Jumper Locations il lustration 1 Open trace Z on the programmable shunt with a small screwdriver 2 Plug trace D on the optional pins near con nector J1 3 Plug trace Y on the optional I O pins near con nector J2 Option 3 This option will energize the In Use LED only when the IN USE line is active Installation refer to the PCB Jumper Locations illustration 1 Open trace Z on the programmable shunt with a small screwdriver 2 Plug trace D on the optional I O pins near con nector J1 17 CUSTOMER STRAPPABLE OPTIONS DOOR LOCK LATCH OPTION With this option the door lock actuator can be lat ched without maintaining the IN USE signal throughout the door lock interval IN USE may be activated by DRIVE SELECT Installation refer to the PCB Jumper Locations illustration 1 Plug trace D on the optional I O pins near nector 1 2 Plug trace DL on the optional pins near connector J2 WRITE PROTECT OPTION With this option installed a Write Protected disk will not inhibit writing but it will be reported to the _controller Installation refer to the PCB Jumper Locations illustration Cut trace WP and trace NP located near the center of the PCB DISK CHANGE Alternate Output low active level on this option line indicates that the disk drive door has been opened manually the disk removed after the DRIVE SELECT signal has gone false an
91. r normal operating conditions For the adjustments the disk drive interior mechanisms must be accessible When specified during some adjustments AC and DC power are to be applied to the drive as per the Interface Con nections table for minimum drive operability Reference is made to the lllustrated Parts Loca tions drawings which identify parts and assembly names and locations and to other detail illustra tions throughout the Maintenance section CAUTION Whenever performing any work on the disk drive with the disk removed a clean piece of paper is to be inserted in place of the disk between the R W heads to prevent their sur faces from contacting each other DRIVE MOTOR PULLEY POSITIONING Proper positioning of the drive pulley on the disk drive motor shaft is described under Spindle Drive Belt and Drive Pulley Replacement DRIVE DOOR AND CARRIER ASSEMBLY ALIGN MENT For this procedure the two screws which mount the rear of the carrier assembly to the main frame casting and the two screws which mount the front of the carrier assembly to the door latch plate should be only finger tight 1 Power down the disk drive 2 Open the disk drive front door 3 While pushing the carrier assembly towards the rear of the disk drive align the carrier so that the distances between the door latch plate and the front bezel are equal at the two carrier front screw points Tighten the two rear carrier screws 4 Verify
92. riage assembly gently 11 Release the two guide bar clamps one on each end of the two head carriage guide rails by loosening their screws Swing the guide bar clamps off the head carriage guide rails 12 Push both head carriage guide rails toward the back of the drive until their front ends drop down through the cut out in the main frame casting 13 CAREFULLY drop the head carriage assembly with guide rails through the cut out in the main frame casting Be careful not to let any of the head carriage assembly tabs or protrusions hang up anywhere do NOT force the head carriage assembly down Replacement 1 Verify that the drive door is closed and that the pulling tab of the steel belt is positioned toward the rear of the drive at the end of its range of travel CAUTION Be sure that a clean paper strip is present between the R W head surfaces of the replacement head carriage assembly as in structed under Removal procedures above 2 Place the two guide rails in position on the replacement head carriage assembly with only about 1 2 in of the guide rails protruding from the front of the head carriage assembly 3 With the drive resting on its side insert head carriage assembly and rails from below through the cut out in the main frame casting long protruding rear ends of the rails first Be sure that the plastic carriage arm tab comes to rest ON TOP of the metal bail plate see the Bail Assembly Removal a
93. s 6 Rotate the stepper motor pulley counterclockwise until the screw which secures steel belt ends and clamp to the pulley is accessi ble with a screwdriver through the slot in the right side of the main frame casting 7 Remove the screw and clamp plate which secure the steel belt ends to the stepper motor pulley 8 Lift the steel belt ends from the stepper motor pulley pin and remove the belt 39 MAINTENANCE PULLING TAB NOTE SCREW DRIVER INSERTED 008 A 045 Figure 35 Steel Belt Stepper Mechanism Note the belt ends arrangement on the pulley the short belt end from the head carriage assembly should be at the bottom next to the pulley Replacement Refer to the illustrations above and below 1 With the head carriage assembly pulling tab on the steel belt pointing up install the steel belt ends on the stepper motor pulley pin short end from the head carriage side first Loosely secure the belt with the clamp and screw Do not tighten the screw at this time 2 Push the slider on the idler assembly forward against the tension spring and place the steel belt over the idler roller see Steel Belt Stepper Mechanism illustration above Release the slider 3 By turning the stepper motor pulley back and forth check that the steel belt runs centered on 40 the idler roller throughout the belt s travel Repeat this step several times to be certain 4 Turn the stepper motor pul
94. sed by con tamination of the disk surface picked up in use and handling Repeated scanning of the disk sur face with R W heads loaded to it might cure the MAINTENANCE situation but may also be detrimental to head per formance disk errors are permanent non recoverable in nature They are typically caused by particles in excess of head gap size or by microscopic voids or pits in the disk surface resulting in error pulses or glitches in the record ed data A soft error when occurring during a write cycle will cause a recorded hard error 2 The most efficient way to find out whether a malfunction is caused by a defective drive is to exchange a suspect unit with one known to be in good working order a compatible exchange QumeTrak 842 Disk Drive is available its internal jumper status should be checked for proper sys tem configuration To verify and establish jumper compatibility compare exchange and suspect drive PCB s and refer to tables Factory Configura tion of Option Traces Programmable Shunt Trace Functions Drive Select Options and Head Select Options in this manual 3 Verify that external connectors J1 P1 and J5 P5 as well as associated cables are drive com patible in good working order and firmly attach ed at both ends 4 Perform AC and DC power measurements as outlined under Power Test below TROUBLESHOOTING PRECONDITIONS All information and particularly the QumeTrak 842
95. sk drive the one farthest away place a piece of plain white paper e Slide the head carriage assembly hand to approximately track 40 position in the middle of its range of travel see Head Carriage Assembly Belt Clamp Access illustration under Steel Belt Removal procedure e Close the drive door e Load and unload the heads one time either by controller command or by temporarily installing a jumper across test points HA and GND on the PCB e Look at the gap between the unloaded R W heads by sighting from the right hand rear corner of the disk drive over the idler assembly through the disk slot in the head carriage assembly at the white paper surface in the left hand front corner If the head surfaces are in contact with each other and there is no gap visible between them load and unload the heads one more time since the heads stick sometimes f there still is no visible gap between the R W heads do NOT repeat loading and unloading but back out the backstop screw in the carriage assembly see illustration below counter clockwise about two turns Open and close the drive door then load and unload the heads there should now be a visible head gap CAUTION The R W head surfaces should not be brought in contact with each other avoid this whenever possible as it may cause head damage Do NOT place any objects between the heads to measure the head gap ANGLE OF VIEW CHECK FOR R W Y HEAD
96. stration PCB Jumper Locations Test Points and Connector Pin Assignments 45 1 to GND on the 24V 10 max ripple 0 1V P P 45 pin 5 to GND on the PCB 5V 5 max ripple 0 05V P P 17 to GND on the PCB 16 40V to 17 60 12 GND the PCB 11 4V to 12 6V TP 6 to GND on the PCB 5 48V to 5 82V TROUBLESHOOTING FLOW CHARTS These Troubleshooting Flow Charts begin on the Following pages Fig 44 Power Failure page 53 Fig 45 Not Ready page 54 Fig 46 Seek Error page 56 52 Fig 47 Read Error page 59 Fig 48 Write Error page 62 Fig 49 No Head Load page 65 MAINTENANCE POWER UP MEASURE AC POWER 2 SEE POWER TEST IS CHECK SYSTEM AS POWER AC SOURCE i RESTORE MEASURE DC POWER 5 POWER TEST RESTORE SUPPLIED CHECK SYSTEM D C POWER DC SOURCE REPLACE PCB INTERNAL DC POWER O K NOT A POWER PROBLEM x see Removal and Replacement Procedures Figure 44 Power Failure Troubleshooting Routine 53 MAINTENANCE PERFORM PREREQUISITE CHECKS INSERT DISK lt REPLACE SELECT DRIVE AS REQUIRED 2 CHECK SYSTEM CONTROLLER CHECK DISK DRIVE MOTOR amp PHASE SHIFT CAPACITOR DRIVE SELECT ACTIVE YES CHECK INTERNAL DS STATUS SHUNT 2 DS STATUS JUMPER CORRECT JUMPER DS CONFIGURATION CHECK INDEX LAMP amp SENSOR ASS IES A7 1 SIDED
97. t instruments are standard electronic maintenance equipment Table 16 Maintenance Tools PHILLIPS SCREW DRIVER 2 TWEEZERS ALLEN WRENCH 3 METRIC FEELER GAUGE SET DIAGONAL CUTTERS NEEDLE NOSE PLIERS SPRING HOOK 2 SOFT BRUSH CLOTH OR PAPER THREADLOCKING POUND 1 HEAD 4 INCH SHANK 2 HEAD 4 INCH SHANK 4 TO 6 INCHES NEEDLEPOINT 1 5mm 2 0mm 2 5mm TO 4mm COMBINED 4 INCH 4 INCH 8 INCH 12 INCH 5 TO 1 0 INCH LINT FREE LOCTITE 222 OR EQIV QUME P N 50151 02 QUME 50235 02 50236 01 SYSTEM COMPATIBLE WITH KNOWN GOOD RECORDING OF DATA 20 k Q IV OR BETTER TRIPLETT MODEL 310 OR EQUIV DUAL TRACE TEKTRONIX MODEL 465 OR EQUIV CERTIFIED R W DISK CE ALIGNMENT DISK DISKETTE MULTIMETER OSCILLOSCOPE 19 MAINTENANCE INTERNAL CONNECTIONS The drive internal connections between the various transducers sensors stepper motor solenoids indicator and the R W heads are established by way of two connectors transducer connector P2 J2 and head connector P3 J3 The two tables below correlate pin assignments signal names and wire colors Refer to the INTERFACE section for external drive connections information Table 17 Transducer Connector P2 J2 Pin Assignments PIN NO SIGNAL NAME IN USE LED RETURN IN USE LED WP LED RETURN WP LED ORANGE WP SENSOR RETURN BLACK WP SENSOR RED TRK 00 LED RETURN BLUE TRK 00 LED ORA
98. ting Remove the assembly from the drive unit Replacement 1 Install the pop up assembly by following the Removal procedure in reverse order Make sure that the pop up assembly tip is in serted into the horizontal guides on the inside of the front bezel Hold the pop up assembly pushed against the side of the main frame casting while tightening the screws 2 Proceed through Pop Up Assembly Adjust ment as outlined under Adjustments DOOR LOCK SOLENOID Removal 1 Disconnect the transducer cable connector J2 from the PCB 2 Remove the two door lock solenoid leads from the J2 connector by pushing down on the tabs with tweezers black to J2 A2 red to J2 B2 see Connector Lead Removal illustration 3 Separate the two door lock solenoid leads from the transducer cable 4 Remove the two screws and washers secur ing the solenoid hook assembly to the front bezel Remove the assembly and three springs refer to the illustration below 35 MAINTENANCE SMALL SPRINGS 2 HOOK PIN DOOR LOCK SOLENOID ES HOOK ASSEMBLY SCREWS 2 008 033 Figure 30 Door Lock Solenoid Removal and Replacement 5 To separate the hook assembly from the solenoid pull out the hook pin Be careful not to let the plunger with spring and padded washer drop out of the solenoid coil Replacement 1 Verify presence of the plunger in the solenoid coil note arrangement of plunger hardware in that or
99. tion FM and Modified Fre quency Modulation MFM formats are shown below C Clock D Data Bit 180 ns min 1100 ns max Figure 6 Write Data Timing for Frequency Modulation FM 150ns min 1100ns max Figure 7 Write Data Timing for Modified Frequency Modulation MFM Write Gate low active level on this line pin 40 enables the write current source and disables the stepping head movement circuitry A high level on this line enables the read circuitry Deactiva tion of DRIVE SELECT and or changing SIDE SELECT must be delayed at least 590 microseconds following a write operation to assure that the track is fully tunnel erased The READ TIMING and WRITE TIMING diagrams il lustrate the timing relationships INTERFACE Side Select SIDE SELECT pin 14 defines which surface of a two sided media disk is used for data recording or retrieval A low active level on this line selects the R W head for surface 1 the disk side facing the carrier assembly A high level on this line selects the R W head for surface O the disk side facing the PCB When switching from side O to side 1 and conversely a 100 micro seconds delay is required before any read or write operation can be initiated Refer to the section on CUSTOMER STRAPPABLE OPTIONS for alternate methods of head selection Low Current A low active level on this line pin 2 is required for writing on tracks 44 through 76 This input is used to lo
100. tional Signal returns all odd numbered pins on P1 J1 24 V return 5 V return and frame ground must be connected together at the controller Pins 48 and 50 on P1 J1 and Pins 3 and 4 on 5 5 are reserved Signal names SIDE SELECT and 2 SIDED have been changed from HEAD SELECT and DISK 2 SENSE resp to comply with ANSI specifications Figure 10 Interface Connections INTERFACE PHYSICAL INTERFACE CONNECTORS AND CABLES The physical interface between the QumeTrak 842 and the host system is made through three con nectors digital WO signals P1 J1 DC power P5 J5 and AC power PO JO The illustration below shows how four disk drives would be con nected to the host system drives 2 and 3 have been deleted for clarity Refer to ELECTRICAL INTERFACE for specific I O signal discussion SIGNALS DRIVE IN CHAIN ONLY Figure 11 Interface Connection SIGNALS signal interfacing occurs through connection P1 J1 in the form of a 50 pin PCB edge connector The dimensions for this connector are shown in the illustration below KEY SLOT io 4 Board Thickness 2 062 007 450 010 400 010 ae m 4 083 2X 050 100 Nom 080 Nom p 2 575 010 Dimensions in inches Figure 12 J1 Connector Dimensions Component Side The table below lists the signal connector pin assignments Table 4
101. to J2 B12 black to J2 A11 red to J2 B11 see the Connector Lead Removal tion 3 Separate the four track 20 sensor leads from the transducer cable 4 Remove the screw with captive washers which secures the track sensor assembly to the main frame casting Remove the assembly Replacement 1 Install the track 99 sensor assembly on the main frame making sure the two pegs on the bot tom of the assembly are in the main frame holes Secure the assembly with a screw with captive washers 2 Route the four sensor leads along the transducer cable to the J2 connector 3 Install the four leads in their proper locations in the 42 connector refer to step 2 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector is plugged in 4 Plug the J2 connector into the PCB INDEX SENSOR ASSEMBLY Removal 1 Disconnect the transducer cable connector J2 from the PCB 2 Remove the four index sensor leads from the J2 connector by pushing down on the sensor lead tabs in the connector with tweezers black to J2 A7 red to 02 87 blue to J2 A6 orange to J2 B6 see Connector Lead Removal illustration 3 Separate the four index sensor leads from the transducer cable 4 Remove the screw and large washer which secure the sensor to the mainframe Remove the sensor Replacement 1 Install the index sensor assembly in th
102. wer the write current by 20 consequently improving the read output resolution of the inner tracks Head Load A low active level on this optional in put pin 18 when the drive s internal READY status is active causes the R W heads to be load ed against the disk Refer to the section on CUSTOMER STRAPPABLE OPTIONS for uses and method of installation of this line In Use low active level on this optional input pin 16 will energize the In Use LED Refer to the section on CUSTOMER STRAPPABLE OPTIONS for uses and method of installation of this line OUTPUT LINES There are seven output lines from the QumeTrak 842 five of which are factory standard and two may be user activated upon option The low true voltage level for the lines is 0 to 0 4 volt Maximum output circuit sink capability is 48 milliamps The high false voltage level is 2 4 to 5 25 volts with a maximum collector cutoff leakage current of 250 milliamps The characteristics of the individual output lines are described below Index This interface signal pin 20 is provided by the drive once each disk revolution The leading negative going edge of each INDEX pulse in dicates to the controller the beginning of a track The timing characteristics for INDEX are shown below 166 7 ms 2 Figure 8 Index Timing INTERFACE Ready low active level on this line pin 22 in dicates that at least three index pulses have been sensed two completed r
103. with captive washers finger tight only 2 Route the two lamp leads along the carrier to the transducer cable and to the J2 connector 3 Install the two leads in their proper locations in the J2 connector refer to step 2 Removal Make sure that the locking tabs on the leads engage in the connector slot This will prevent the leads from pushing out when the connector is plugged in 4 Plug the J2 connector into the PCB 5 Perform Index Lamp Alignment as outlined under Adjustments CARRIER ASSEMBLY Removal Refer to the lllustrated Parts Locations drawings sheet b and to the illustration below 33 MAINTENANCE 1 Cut a strip of clean paper approximately 2 X 8 in and fold it end to end to half length While the drive front door is open carefully insert the paper folded end first into the disk slot of the head carriage assembly from the front Leave the drive door open CAUTION The R W head surfaces must not be permit ted to contact each other Be sure the paper remains between the heads in the head car riage assembly disk slot throughout this pro cedure 2 Depending on whether the index lamp is to re main in the disk drive while the carrier assembly is removed or whether it is to be removed with the carrier e either release the index lamp assembly from the carrier assembly by removing both lamp mounting screws and pulling the index lamp leads from their supports on the carrier underside
104. work on the disk drive with the disk removed a clean piece of paper is to be inserted in place of the disk between the R W heads to prevent their sur faces from contacting each other PRINTED CIRCUIT BOARD PCB Removal Refer to sheet a of the Illustrated Parts Locations drawings for identification of items and locations mentioned below 1 Disconnect the interface cable transducer cable and R W head cable from their respective PCB connectors J1 J2 J3 2 Remove the two screws which secure the PCB to the main frame casting along the edge of the interface connector J1 and loosen the re maining two screws 3 Slide the PCB edge out from under the two loosened screws and lift the PCB out of the drive Replacement 1 Reverse the above procedure for re installa tion of the PCB SPINDLE DRIVE BELT AND DRIVE PULLEY Removal 1 Remove the PCB as outlined under PCB Removal 28 2 While turning the belt drive pulley by hand guide the drive belt so that it will rise up and over the edge of the drive pulley 3 Loosen the allen head setscrew in the drive pulley and slide the pulley from the motor shaft Replacement Refer to the illustration below 1 Slide the drive pulley onto the motor shaft and align the pulley setscrew with the flat surface on the shaft Bring the top face of the drive pulley flush with the top of the motor shaft and tighten the setscrew GROOVE IN 50Hz PULLEY ONLY NOT IN 60Hz P

Qume Trak 842 Service Manual

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