Qume Trak 542 Service Manual
Contents
1. 17 Test Equipment and Tools Required 29 Recommended Spare Parts 41 INTRODUCTION SCOPE This manual contains information describing the operation and maintenance of the QumeTrak 542 Flexible Disk Drive The first section of the manual describes the design features and the configuration specifications The INTERFACE section lists the physical connections of the QumeTrak 542 and describes the electrical interface lines The INSTALLATION section provides inspection unpacking and mounting information The CUSTOMER STRAPPABLE OPTIONS section describes the available strappable options and possible configuration modifications The MAINTENANCE section provides preventive maintenance information removal and replacement procedures adjustment instructions diagnostics and troubleshooting procedures DESCRIPTION GENERAL The QumeTrak 542 Flexible Disk Drive is a low cost direct access data storage device for 5 25 inch two sided flexible floppy diskettes It is an advanced and sophisticated design that is based on Qume s years of manufacturing experience with the larger QumeTrak 842 eight inch version The QumeTrak 542 employs a two sided head carriage assembly with a ceramic Read Write R W head for long media life It also uses a field proven lead screw system for highly accurate and reliable head positioning The media drive is a DC spindle drive motor This eli2. 5 Direction Select uoo e etant e ede Mie ae e AC a ab T 5 c EI x 5 Write Data ya pha NO MOL ae As ata or Vb Decade ud d 5 VEO as Serine bu cx LEE aspi EI E 5 MUS 5 OUTPUT LINES a Zulu uu rae a u Sus p MEUM ere hak 5 Index ERAT 6 Track SUE as u aL Ey ura Prid 7 Write Protect Ido II ES s te s Tau W Si Pas ob hes 7 Read Data uu ex vetet GUS ee ates Ee eee eet E 7 Ready Tem a am Saale Rura 7 PHYSICAL INTERFACE 25e E eb VES EX ae 7 Connectors and Cables 7 VO Signal Menace See cae e dad teas a ea e e cc a 7 DG POWER RT bee MED 8 PETUNIA LOR D RR a AR wee EU les at oo 8 Frame tur ae 8 INSTALLATION 9 RECEIVING AND INSPECTION 9 INSTALLATION REQUIREMENTS 10 MOUNTING ee eto Rn c pd dina 11 Mechanical Dimensions 11 Recommendations 11 PROPER DISKETTE de Pr eh E ESO QR PER a 12 WARRANTY SERVICE AND TRAINING 12 Warranty and Service cuie eec us e OE RACER E VOR 12
3. 24 Drive Motor Bel te uu Wile As hub 25 Track 00 Switch 25 Head Carriage 26 Stepper MOtor s Zes u Z Pus aa S D EVI VE DE 27 ADJUSTMENTS AND CHECKS 29 GENERAL ew rie II EE uus 29 DRIVE MOTOR ADJUSTMENT 29 HEAD ALIGNMENT ADJUSTMENT 29 TRACK 00 SWITCH ADJUSTMENT 30 TRACK 00 STOP ADJUSTMENT 30 INDEX SENSOR ADJUSTMENT 31 AZIMUTH ALIGNMENT CHECK 31 5 REN 35 GENERAL stat exea orion at e Ro Rae LIE t uv br ciue 35 DEFINITION OF QUMETRAK 542 FUNCTIONAL ERRORS 35 Wii edo 35 Seek Error ees the eke atas 35 Read EE Olio tow Vade Bane dae de erit a tem Bows 35 oco tai oad qu e a sasa 35 No Head SR 35 TROUBLESHOOTING TECHNIQUE 35 TROUBLESHOOTING FLOWCHARTS 35 RECOMMENDED SPARE PARTS 41 ILLUSTRATED PARTS uas rena tate AME Eee 43 FIGURE LIST
4. 23 Index Sensor Installation 23 Motor Control Board Drive Motor Leads 24 Stepper Motor and Head Carriage Removal and Installation 26 Gats eye Pattern vu xao as be hawt oak a 30 Track 00 Stop Adjustment 31 Index Burst xe qus RR ERU WS NE 31 Azimuth Check TEE 33 Not Ready Troubleshoooting Flowchart 36 Seek Error Troubleshooting 37 Read Error Troubleshooting 38 Write Error Troubleshooting Flowchart 39 No Head Load Troubleshooting Flowchart 40 TABLE OOnN OOF WN LE lA LX E LIST OF TABLES TITLE PAGE Performance Specifications 2 Drive Select eau pasty AERE eae bahay tke ws see 3 Connector P1 Requirements fora Flat Cable 7 Connector P1 Requirements for Twisted Pairs 8 Signal Connector P1 J1 Pin Assignments 8 Connector P2 J2 5 8 Power Connector Pin 51 15 8 Installation Requirements 10 Factory Configuration of the Option Traces and Jumpers 13 Programmable Shunt Trace Functions 15 Maintenance Tools
5. 6 32 UNC X 0 31 MOUNTING MECHANICAL DIMENSIONS Shown below are the top bottom and side views of the QumeTrak 542 The mounting and clearance dimensions shown in inches should be reviewed before installation 1 59 000 400 A Figure 14 QumeTrak 542 Bottom View RECOMMENDATIONS The QumeTrak 542 can be mounted in any plane horizontal for front loading and vertical for front or No 632 UNC X 0314 top loading When the disk drive is mounted in a horizontal front loading position it must be so placed that the door opens upward and the In Use LED on the front bezel is below the door refer to the illustration below 0 37 MAX No 6 32 UNC X 0 318 lt 0 78 MAX 2 PLACES EACH SIDE 3 12 008 0 86 0 008 0 000 1 59 0006 0 474 010 7 47 399 Figure 13 QumeTrak 542 Side View PROPERLY INSTALLED PCB UP IMPROPERLY INSTALLED PCB DOWN Figure 15 Disk Drive Mounting 11 INSTALLATION PROPER DISKETTE USE It is paramount that a proper 5 25 inch diameter diskette is used in the QumeTrak 542 Ensure that only soft sectored 40 track capacity diskettes meant for drives of 40 track capability are being used in the drive Attempting to use any other track capacity diskette in the drive may result in serious R W head damage The 40 track diskette to be used in the QumeTrak 542 can be easily identified by noting the measurement betwee
6. 50 ms min VALID READ DATA 1 sec min Figure 5 Control and Data Timing Requirements INDEX This interface signal pin 8 is provided by the _____ 200ms 1 59 _ drive once each revolution The leading negative going edge of the INDEX pulse indicates to the controller the beginning of the next track See the timing characteristics for INDEX in the adjacent illustration Figure 6 Index Timing Track 00 An active low level on this line pin 26 indicates that the R W head is positioned at Track 00 Write Protect An active low level on this line pin 28 indicates that a diskette with a disable tab covering the write enable notch is installed Under normal operation the drive will inhibit writing when a pro tected diskette is installed Read Data Data from the diskette is output to the host system in the same form as it was received on the WRITE DATA line Each flux reversal that is sens ed on the diskette produces an active low pulse on the READ DATA line pin 30 and a return to high level one microsecond later The timing characteristics for READ DATA are shown below 250 5 8 00 us nom LEADING EDGE OF 800 FROM NOMINAL D LEADING EDGE OF BIT CAN BE 400 ns FROM NOMINAL 396 A Figure 7 Read Data Timing Ready An active low level on this line pin 34 indicates that the drive is ready to read or write data PHYSICAL INTERFACE CONN
7. 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 A QUME CERTIFIED 12 MINUTE CE DISK QUME P N 51201 01 THE AZIMUTH SHALL BE AC CEPTABLE IF A DRIVE SHOWS LESS THAN THE MAXIMUM ALLOWABLE 18 MINUTE AZIMUTH THE MAXIMUM ALLOWABLE AZIMUTH IS CONSIDERED TO BE ATTAINED WHEN BURST 1 IS 25 LARGER THAN BURST 2 OR IF BURST 4 IS 25 LARGER THAN BURST 3 Figure 32 Azimuth Check 33 TROUBLESHOOTING GENERAL This section presents troubleshooting information dealing with the most common QumeTrak 542 functional errors namely Not Ready Seek Error Read Error Write Errors and No Head Load The troubleshooting of these errors is accomplished in flowchart format DEFINITION OF QUMETRAK 542 FUNCTIONAL ERRORS Not Ready A condition in which the controller fails to receive a READY signal from the disk drive when it ex pects to receive one Seek Error A condition in which the drive is unable to access a particular diskette side or track or to confirm track 00 access to the controller Read Error A condition in which the drive is unable to recover data previously written onto the diskette Write Error A condition in which the drive is unable to write data onto a diskette No Head Load A condition in which the R W head fails to load onto the diskette This condition may be assoc
8. ILLUSTRATED PARTS The following pages contain illustrated assemblies and corresponding parts lists for the QumeTrak 542 Flexible Disk Drive Illustrations in each section pro vide an assembly guide and may be used for iden tification of missing or broken parts when repairing a disk drive Some parts may be illustrated for clari ty only Parts not shown or listed are not available For information on service and repair policies train ing policies and spare parts pricing for the QumeTrak 542 Flexible Disk Drive refer to the Memory Products Service and Spares Catalog publication number 37052 43 ILLUSTRATED PARTS 214 8 01 FINAL ASSEMBLY 44 FINAL ASSEMBLY Item Part No Description 1 51115 02 Front Bezel Assembly 2 51116 01 In Use Lamp Assembly Note 1 3 51087 01 Head Load Solenoid 4 51109 01 Track 00 Sensor Assembly Note 2 5 51150 02 Harness Left Media Guide Assembly 6 55173 08 Screw PH w Lk Fitwshr 3 mm 7 51149 02 Door Carrier Assembly Note 3 8 52006 01 Media Guide Assembly RH Carriage Stepper 9 Carriage Stepper Assembly Note 4 10 51079 02 Drive Motor Note 5 11 51082 02 Motor Control Board Assembly Note 5 12 51004 01 PCB Assembly 13 55173 06 Screw w Lk Fitwshr 4x 8mm 14 51086 01 Drive Belt 15 55173 12 Screw w Lk Fltwshr 16 55210 04 Washer 17 55163 06 Screw w Lk Fitwshr 3 x 6mm 18 85355 06 Screw M 3 x 05 x 6mm Nylon FH 19 55260 03
9. center of the diskette The logic state of DIREC TION SELECT 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 of a following STEP pulse The logic state of DIRECTION SELECT cannot be changed during the positive going transition of STEP or within the one microsecond preceding the positive going transition of STEP Step An active low pulse on this line pin 20 will cause the R W head to be moved one track The direction of movement is controlled by the DIRECTION SELECT line Pulses applied to the STEP line have the timing characteristics shown below 12 ms min Figure 3 Step Timing INTERFACE Write Data This interface line pin 22 provides the data to be written on the diskette Each transition from a high level to an active low level causes the write current polarity through the head to be reversed The timing characteristics for the WRITE DATA Frequency Modulation FM format are shown below CLOCK 4 00 5 8 00us DATA BIT 10ns 2015 150 ns min 1100ns max Figure 4 Write Data Timing for Frequency Modulation FM Write Gate An active low level on this line pin 24 enables the write current source and disables the stepping head positioning circuitry A high level on this line enables the read circuitry Deactivation of DRIVE SELECT and or changing SIDE SELECT must be delaye
10. refer to the illustration above 1 Slide the carriage assembly into the stepper motor shaft and install as a unit in the main frame Loosely tighten the two stepper motor mounting screws to hold the motor in place 2 Slide the carriage to its forward limit and position the stepper motor shaft so as to locate a point in the spiral groove that is in alignment with the screw holes used to mount the plate spring and retainer 3 Apply a small dab of grease in the hole of the plate spring Place the steel ball in the greased hole and install the plate spring in the carriage When properly aligned the steel ball should ride in the spiral groove with the plate spring perpendicular to the stepper motor shaft 4 Apply a drop of light lubricating oil Q P N 55279 01 to the fur felt in the retainer Install the re tainer with the fur felt against the steel ball in the plate spring and secure all in place on the carriage with two Phillips head screws and washers 5 Install the six stepper motor leads in connector J3 by inserting the lead tabs into the connector slots as follows black to A5 yellow to A6 brown to A7 red to B5 red to B6 and orange to B7 6 Secure all leads terminating in connector J3 with a tie wrap near the base of the connector 7 Secure the two R W head cables on the right media guide 8 Install the door carrier assembly and the PCB refer to the Carrier Assembly and Printed Circuit Board paragraphs
11. 004 to 0 01 inch 0 1 to 0 25 mm Cut two strips of 20 pound bond typing paper to approx imately 1 X 3 inches Place the two paper strips between the RAW head surfaces and close the drive door Since the combined thickness of the paper strips is about 0 008 inch a slight tug will be noticed as the paper is moved between the heads Adjust the carrier stop screw as required Turning the stop screw clockwise will bring the heads closer together CAUTION Do not allow the R W heads to come together without a clean piece of paper or a diskette inserted between the head surfaces 5 Install the PCB refer to the Printed Circuit Board paragraph 6 Adjust the index sensor refer to the ADJUSTMENTS section 21 MAINTENANCE COLLET ASSEMBLY Removal refer to the Collet Assembly Removal and Installation illustration 1 Remove the diskette if installed the PCB front door assembly and carrier assembly refer to the Printed Circuit Board Front Door Assembly and Carrier Assembly paragraphs 2 Remove the E ring securing the collet assembly to the carrier and remove the carrier 3 Remove the E ring at other end of the collet shaft to remove the collet assembly Replacement refer to the Collet Assembly Removal and Installation 1 Install the collet assembly parts on the shaft as shown in the Collet Assembly illustration a E RING CARRIER E RING SHIM BEARING c5 CONE COLLET a
12. 9 Adjust the track 00 switch track 00 stop and the stepper motor as necessary refer to the Adjustments section STEPPER MOTOR Removal refer to the Stepper Motor and Head Carriage Removal and Installation illustration 1 Remove the diskette if installed and the PCB refer to the Printed Circuit Board paragraph MAINTENANCE CAUTION The R W heads must not be allowed to come together Insert a clean piece of paper between the head surfaces 2 Cut the tie wrap securing the wires near the base of connector J3 3 Remove the six stepper motor leads from con nector J3 by pushing down on the motor lead tabs in the connector with tweezers black to A5 yellow to A6 brown to A7 red to B5 red to B6 and orange to B7 4 From the underside of the carriage assembly remove the two Phillips head screws and washers that secure the retainer plate spring steel ball and carriage to the shaft of the stepper motor 5 Remove the two Phillips head screws lock washers and flat washers that secure the stepper motor to the main frame Slide the stepper motor shaft out of the head carriage and remove the motor from the main frame 6 Remove the track 00 stop and stepper collar from the motor shaft Replacement refer to the Stepper Motor and Head Carriage Removal and Installation illustration 1 Install the stepper collar on the stepper motor shaft with the flange side against the motor Next install the track 00
13. OF ILLUSTRATIONS TITLE PAGE Recommended Controller Interface Circuit 3 Interface Connections 4 Step Timing eek ae ois 5 Write Data Timing for Frequency Modulation FM 5 Control Data Timing Requirements 6 cw at Reste ate lane 6 Read Data Timing 7 Interface Connection 7 Connector J1 Dimensions component side 7 a emus aad xa ati 8 Unpacking the Disk Drive 9 QumeTrak 542 Top View 11 QumeTrak 542 Side View 11 QumeTrak 542 Bottom View 11 Disk Drive MOUNTING 11 40 Track Diskette PET 12 PCB Trace Jumper Locations 14 Stepper Motor Power Option Connections 16 Front Door Installation 18 LED Removal u LEER ORE ERA e 18 In Use LED Installation 19 Connector Lead Removal Typical 19 Carrier Assembly Removal and Replacement 21 Collet Assembly Removal and Replacement 22 Spindle Components Removal and Replacement
14. PROTECT DRIVE SELECT 2 READ DATA MOTOR ON READY DIRECTION SELECT STEP WRITE DATA WRITE GATE SIDE SELECT SIGNAL RETURNS DC POWER CONNECTOR P2 J2 DC SIGNAL GROUND GROUND 12VDC NOTE 12V RETURN 2 SIGNAL RETURNS ALL ODD NUMBERED PINS 12V RETURN 5 RETURN 3 RETURN AND FRAME GROUND MUST BE CONNECTED TOGETHER AT THE CONTROLLER 5VDC 4 AC GROUND FRAME GROUND Figure 2 interface Connections NOTE When 050 083 not desired an Optional Drive Select can be used by shorting the MX trace on the programmable shunt The HM trace must then also be shorted to activate the head load solenoid when the MOTOR ON signal is true Motor On An active low level on this line pin 16 enables the drive motor The spindle takes one second after MOTOR ON is activated to come up to speed before reading or writing on the diskette If no commands are to be issued to the drive within two seconds 10 media revolutions of completion of a previous command this line should be deac tivated to ensure maximum motor life Direction Select DIRECTION SELECT pin 18 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 towards the center of the diskette With the DIRECTION SELECT 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
15. SPRING COLLET S Figure 24 Collet Assembly Removal and Replacement 22 2 Install the carrier on the collet assembly and secure with an E ring 3 Install the carrier assembly front door assembly and PCB on the disk drive refer to the Carrier Assembly Front Door Assembly and Printed Circuit Board paragraphs SPINDLE COMPONENTS Removal refer to the Spindle Components Remov al and Replacement illustration 1 Remove the diskette if installed Remove the PCB front door assembly and carrier assembly refer to the Printed Circuit Board Front Door Assembly and Carrier Assembly paragraphs only if the spindle hub bearing and collar are removed 2 Remove the drive belt from the spindle pulley 3 While firmly holding the spindle pulley remove the screw and washer that secures the spindle components to the spindle hub 4 Remove the desired spindle components Replacement refer to the Spindle Components Re moval and Replacement illustration 1 Install the spindle hub bearing and collar if removed 2 Install the wave and spindle washers the bear ing and the spindle pulley as shown Secure with a screw and a washer 3 Install the drive belt on the spindle pulley 4 If the spindle hub bearing and collar were removed install the carrier assembly front door assembly and PCB refer to the Carrier Assembly Front Door Assembly and Printed Circuit Board paragraphs SPIND
16. connector J3 3 Install the index sensor in the main frame as shown in the illustration below Secure the sensor with a screw and a washer INDEX SENSOR WASHER SCREW Figure 26 Index Sensor Installation 23 MAINTENANCE 4 Install the carrier assembly and index lamp refer to the Carrier Assembly paragraph 5 Install the front door assembly and PCB refer to the Front Door Assembly and Printed Circuit Board paragraphs 6 Adjust the index sensor with the index lamp refer to the ADJUSTMENTS section HEAD LOAD SOLENOID ASSEMBLY Removal 1 Remove the diskette if installed the PCB front door assembly carrier assembly and left media guide as viewed from the front of the disk drive refer to the Printed Circuit Board Front Door Assembly Carrier Assembly and Media Guide paragraphs 2 Remove the screw securing the head load solenoid to the main frame Note how the two solenoid leads are routed along the main frame to the transducer cable connector J3 3 Cut the tie wrap securing the wires near the base of connector J3 4 Remove the two head load solenoid leads from connector J3 by pushing down on the solenoid lead tabs in the connector with tweezers green to A4 white to B4 5 Separate the two head load solenoid leads from the transducer cable and remove the solenoid Replacement 1 install the two head load solenoid leads in connector J3 refer to step 4 above regarding Removal Ensu
17. diskette of known integrity in the disk drive 3 Power up the disk drive so that the drive motor is turning the spindle pulley 4 Observe the appropriate scale 50 Hz or 60 Hz on the spindle pulley Motor speed is properly adjusted when the white black pattern on the decal ring appears to be standing still and pulsate or flash If the pattern rotates slowly adjust VR1 on the motor control board until it stands still HEAD ALIGNMENT ADJUSTMENT NOTE 1 For a more precise adjustment the disk drive should be oriented in its vertical or horizontal in service position while on the test bench 2 Qume s CE diskettes are certified at 70 5 F and 45 5 relative humidity 1 Set the oscilloscope controls as follows VOLTS DIV CH1 amp CH2 50 mv VAR KNOB CH1 amp CH2 CAL CH2 INVERT VERT MODE ADD ACIGND DC CH1 CH2 AC HORZ DISPLAY A TRIG MODE NORM TRIG COUPLING AC AIB TIME DIV 20 ms SLOPE SOURCE EXTERNAL 2 Power up the disk drive 3 Install a Qume CE diskette 51201 01 4 Connect oscilloscope channel probes 1 and 2 to TP1A and TP1B R W head signals respectively and the trigger probe to TP3 Index on the PCB Connect the probe ground leads to the GND test point 5 Starting from TRACK 00 step the head carriage IN on the diskette until 5 pattern is observed on the oscilloscope as shown below The pattern should appear on TRACK 16 otherwise set the h
18. e DRIVE SELECT O DRIVE SELECT ORIVE SELECT 2 DRIVE SELECT 3 HEAD LOAD SH 6 MOTOR ON 5 5 SH NOTES UNLESS OTHERWISE SPECIFIED ALL RESISTOR VALUES ARE IN OHMS 1 4 W 5 2 ALL CAPACITOR VALUES ARE IN MICROFARADS 2 3 4 5 6 7 8 mont m BINARY 5 5 RN3 4 7K RN2 4 7K DS SH 5 R44 5V0 220 D IN USE LEO J3 U4 B 13 Q9 74046 Vy CI835 l2 l 12 o 53 CR20 JS HEAD LOAD 2 5 L SOLENOID ec Da e 7404N 4 5 UPS U2B 150 Be 2 5V O L U4 B MTR ON 5 Ds E p ut C1833 JI 7404N KAS 4 U28 150 ps 15v o BAL 5V 0 yac 8 54 4 G 1 4 U28 150 5vo 2 JI 38 69 341 12 7ALSI4N 15 In I0 R34 35 v 5V O 7 6 RN3 f 4 7K U2E L T4221N 3 ALL DIODES ARE 15953 SH ALL ODD PINS ON Ji ARE GNO T 5 5 ume SH e WE ASSY QUME 5 5 TRAK 542 SCHEM pem 5 5100401 F SWVHDVIG RIA HEA A d 412 R W COIL cle R35 220 pt 5 2 1K Ji 7 15 14 i 5 lus jos 9 READ DATA 124 7438N HEAD L i RIW COIL SH 4 2 L 18 2K 14 TS ena BITF DATA 75452 WRITE DATA 1 gt T4LSIAN WRITE GATE 5 2 5H 4 SH 4 veo M E MV TRAK
19. evidence of such damage on the invoice and file a claim with the carrier immediately if the conditon of the unit so warrants 7 damage that might impair drive operation is detected do not attempt to operate the disk drive Contact Qume for advice and instructions 8 Refer to these instructions when repacking the drive Figure 11 Unpacking the Disk Drive INSTALLATION INSTALLATION REQUIREMENTS The QumeTrak 542 has certain power environ mental and mechanical requirements Review the table below before installing the disk drive Table 8 Installation Requirements VOLTAGE MAX RIPPLE CURRENT DC POWER REQUIREMENTS AT THE DC POWER CONNECTOR J2 12 12 06 5 5 0 1V 1 35A 135 MAXIMUM TYPICAL 8 TYPICAL 5 VDC 5 0 05 V P P 1 0A MAXIMUM 7A TYPICAL CONTINUOUS 18 7 W TYPICAL 64 BTU HR STAND BY 7 5 W TYPICAL 25 BTU HR OPERATING STORAGE 5 C TO 43 C 10 TO 45 C TEMPERATURE 41 F TO 110 F 14 F TO 113 F ENVIRONMENT ae LATIVE 20 80 8 80 WET BULB 29 C 29 C 84 F NO CONDENSATION NO CONDENSATION HEIGHT 82 6 mm 3 25 in MECHANICAL DEPTH 189 7mm 7 47in POWER DISSIPATION HORIZONTAL FRONT LOAD PCB SIDE UP ONLY VERTICAL FRONT LOAD VERTICAL TOP LOAD MOUNTING POSITIONS 561 A 10 INSTALLATION
20. guide to the main frame 3 Carefully remove the left media guide from the main frame keeping in mind that the write protect sensor and lamp leads are routed between the guide and the main frame 4 Remove the write protect sensor and lamp from the media guide 5 Cut the tie wrap securing the wires near the base of transducer cable connector J3 6 Remove the four write protect sensor and lamp leads from connector J3 by pushing down on the sensor and lamp lead tabs in the connector with tweezers sensor black to A14 orange to B14 lamp black to A13 yellow to B13 7 Separate the four write protect sensor and lamp leads from the transducer cable and remove the sensor and lamp Note the routing of the leads along the cable for later replacement 20 Replacement 1 Install the four write protect sensor and lamp leads in connector J3 refer to step 6 above regarding Removal Ensure that the locking tabs on the leads engage in the connector slots This will prevent the leads from being pushed out when the connector is plugged into the PCB 2 Secure the four leads to the transducer cable with a tie wrap near the base of connector J3 3 Route the write protect sensor and lamp leads along the transducer cable 4 Install the write protect sensor and lamp in the left media guide The lamp yellow and black leads is installed from the top and the sensor orange and black leads is installed from the bottom 5 Ins
21. installed FRAME GROUND The QumeTrak 542 must be grounded to the con troller to insure proper operation and low noise susceptibility The system frame ground wire should be connected to the disk drive frame A fast on tab is provided on the drive for this purpose FAST ON TAB MATING CONNECTOR AMP PIN 61664 1 AMP P N 60972 1 INSTALLATION RECEIVING AND INSPECTION The drive is wrapped in a plastic bag to prevent dust contamination of the R W heads Unpack and inspect the disk drive as follows refer to figure 11 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 drive from its cradled position Lift the drive from the bottom up and out of the container 3 Remove the drive from the plastic bag 4 Open the drive door and remove the cardboard shipping insert CAUTION The R W heads must not be allowed to come together without a diskette a clean piece of paper or the cardboard shipping insert in stalled between the head surfaces 5 Retain all packing materials for possible reshipment Always install the cardboard insert between the heads should reshipment be necessary 6 Inspect the drive for scratches dents loose components and other obvious damage Note any
22. oscilloscope probes from the PCB 30 4 Set the oscilloscope controls as follows VOLTSIDIV CH1 2 VAR KNOB CH1 CAL VERT MODE CH1 ACIGND DC DC TRIG MODE AUTO 5 Connect the oscilloscope channel 1 probe to TP5 Track 00 on the PCB Connect the probe ground to the GND test point 6 Observe on the oscilloscope a high 4V level If necessary to adjust loosen the TRACK 00 switch mounting screws and reposition the switch to obtain the desired 4V level Secure the switch mounting screws 7 Alternate the head carriage between TRACK 00 and TRACK 01 several times Observe that on TRACK 00 a high 4V is indicated on the oscillo scope and on TRACK 01 a low 0V level Repeat step 6 as necessary to obtain the proper levels 8 Disconnect the oscilloscope probes from the PCB and remove the diskette from the drive Power down the disk drive TRACK 00 STOP ADJUSTMENT 1 Verify that the TRACK 00 switch is properly ad justed and that the head carriage is located at TRACK 00 refer to the TRACK 00 SWITCH AD JUSTMENT paragraph 2 With a feeler gauge check the gap between the head carriage and the TRACK 00 stop as shown below The correct tolerance is 0 027 inch 0 7 mm 0 05 mm SOCKET HEAD SCREW STEPPER MOTOR SHAFT w TRACK 00 STOP 0 027 INCH e 0 7 mm 0 05 m m ASSEMBLY Figure 30 Track 00 Stop Adjustment 3 If adjustment is necessary loosen the screw that secures the stop on the step
23. stop on the stepper motor shaft with the flat side toward the stepper collar Do not tighten the socket head screw as adjustment will be required later 2 Insert the shaft of the stepper motor into the head carriage assembly and install the motor in the main frame Loosely tighten the stepper motor mounting screws to hold the motor in place 3 Slide the carriage to its forward limit and position the stepper motor shaft so as to locate a point in the spiral groove that is in line with the screw holes used to mount the plate spring and retainer 4 Apply a small dab of grease in the hole of the plate spring Place the steel ball in the greased 27 MAINTENANCE hole and install the plate spring in the carriage When properly aligned the steel ball should ridein the spiral groove with the plate spring perpen dicular to the stepper motor shaft 5 Apply a drop of light lubricating oil Q P N 55279 01 to the fur felt in the retainer Install the re tainer with the fur felt against the steel ball in the plate spring and secure all in place on the carriage with two Phillips head screws and washers 6 Install the six stepper motor leads in connector J3 by inserting the lead tabs into the connector 28 slots as follows black to A5 yellow to A6 brown to AT red to B5 red to B6 and orange to B7 7 Secure all leads terminating in connector J3 with a tie wrap near the base of the connector 8 Install the PCB refer to th
24. the DC power cable connector J2 and transducer cable con nector J3 from the PCB 2 Separate the four drive motor leads from the transducer cable by cutting the two tie wraps attached to the main frame under the stepper motor 3 Remove the two screws securing the motor control board to the main frame 4 With soldering equipment remove the four drive motor leads from the motor control board 1 yellow 2 red 3 green and 4 blue Numeric references are indicated on the component side of the board refer to the illustration above 5 Remove the drive belt 6 Remove the two screws securing the drive motor to the main frame Remove the drive motor Replacement 1 Install the drive motor on the main frame and secure with two screws MAINTENANCE 2 Install the drive belt 3 With soldering equipment secure the four drive motor leads to the motor control board refer to step 4 above regarding Removal 4 Install the motor control board on the main frame and secure with two screws 5 Secure four drive motor leads three motor control leads and two track 00 switch leads along the main frame with two tie wraps Attach the tie wraps to the main frame at the two holes under the stepper motor 6 Install connectors J2 and J3 on the PCB 7 Adjust the drive motor refer to the ADJUST MENTS section TRACK 00 SWITCH ASSEMBLY Removal 1 Remove the diskette if installed the DC power cable connector J2 and tr
25. the two screws securing the right media guide to the main frame and remove the guide 4 Remove the two screws securing the left media guide to the main frame 5 Carefully remove the left media guide from the main frame being aware that the write protect sensor and lamp are still secured to the guide Note the way the write protect lamp leads are routed between the guide and the main frame for later replacement 6 Remove the write protect sensor and lamp from the media guide Replacement 1 Install the write protect sensor and lamp in the left media guide The lamp yellow and black leads is installed from the top and the sensor orange and black leads from the bottom 19 MAINTENANCE 2 Install the left media guide in the main frame Ensure that the write protect lamp leads are routed between the guide and the main frame through the indentation on the guide 3 Secure the media guide to the main frame with two screws 4 Install the right media guide on the main frame and secure with two screws 5 Attach the two R W head cables to the right me dia guide The cable to side A of connector J4 should be above the cable to side B of the connec tor 6 Install the PCB refer to the Printed Circuit Board paragraph WRITE PROTECT SENSOR AND LAMP ASSEMBLY Removal 1 Remove the diskette if installed and the PCB refer to the Printed Circuit Board paragraph 2 Remove the two screws securing the left media
26. uic EUM 12 CUSTOMER STRAPPABLE OPTIONS 13 GENERAL 13 INCORPORATION OF OPTIONS 15 Programmable Shunt 15 Drive Select usr yy u L 15 Head Load Options SR RD DES E sie 15 Stepper Motor Power Options 15 Side Select Options us e dle ae 16 TABLE OF CONTENTS CONTINUED PAGE MAINTENANCE 17 PREVENTIVE MAINTENANCE 17 5 17 REMOVAL AND REPLACEMENT PROCEDURES 18 Printed Circuit Board 18 Front Door Assembly 18 Front Bezel Assembly 18 In Does e estates E VERE d dfe cU SY 19 M dia 19 Write Protect Sensor and Lamp Assembly 20 Carrier Assembly EORR SCR AA S UA eae Rs n 20 Gollet ASsembly amp oss e Qe cbr dap 22 Spindle Components 22 Index Sensorand Lamp Assemblies 23 Head Load Solenoid 24 Motor Control
27. 542 7438N i 5 5100401 F SIDE SELECT LS SWVHDOVIG J3 RN4 T JI 8 34 READY 7438N 5 INDEX SENSOR TALSIAN T4LSI4N JI 6 INDEX WP a lt o WRITE C22 x PROTECT 3 LJ 9 001 R 99 SENSOR ve 5 I 5 ep VRI 2 2K SH 4 gt 4 T4LSIAN T4LSI4n J C1833 K 07 9 220 C1835 3 RSI t Je JI n lt WRITE PROTECT D T438N s 5 as 26 TRACK 09 7438N D 12V 12 I 12 5 5N 5V RETURN 6 11 51004 01 SWVYDVIG SEE MOUNTING DETAILS MADE IN USA c3 1096 1022 60 CS 140 gt ASSY 51082 01 REV B COMPONENT SIDE MOUNTING DETAILS Q1 PCB SOLDER SIDE GRN CI YEL RED BLU J A2 2 MPS U95 MTR GND BLK 6 12V RED MTR ON BLUE Motor Control Board DIAGRAMS 628 A 02 53 DIAGRAMS 54 Typical Interconnection Diagram 420 A 01 MOTOR CONTROL BOARD WRITE PROTECT SENSOR SIDE 0 WRITE PROTECT SENSOR SIDE 1 INDEX SENSOR SIDE 0 INDEX SENSOR LAMP SIDE 1 IN USE LIGHT TRACK 00 SWITCH HEAD LOAD SOLENOID DC MOTOR CONTROL PCB J3 CONNECTOR 55
28. AD LOAD TIME MOTOR START TIME INTERFACE ELECTRICAL INTERFACE GENERAL The 542 has two interface connectors Connector P1 J1 interfaces data signals and con nector P2 J2 interfaces the 5V and 12V DC power sources The interface connections are shown in the illustration on the following page 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 out put line drivers and TTL logic level receivers on the input lines The input of all receiver lines in a single drive and those in the last drive of a daisy chain must be terminated in 150 ohms pulled up to 5 volts refer to the Terminator paragraph The illustration below shows the recommended controller interface circuit Controller Drive 0 1 2 Drive 3 5 gt 7438 or equivalent UA w TTL 7414 or equivalent TTL x 7438 10 feet max Figure 1 Recommended Controller Interface Circuit INPUT LINES There are eleven active low TTL input lines The low true voltage level for the lines is O to 0 4 volts The high false voltage level is 2 4 to 5 25 volts The characteristics of the individual input lines are described below Head Load An active low level on this lin
29. Board and Front Door assembly paragraphs 2 Remove the two screws securing the front bezel to the main frame 3 Carefully remove the front bezel from the main frame keeping in mind that the In Use LED is still secured to the front bezel 4 With small screw driver carefully lift one edge of the LED collar from the LED holder refer to the illustration below COLLAR FRONT BEZEL Figure 20 Use LED Removal 5 Push the In Use LED through the front bezel to break the LED holder loose from the LED collar 6 Remove the LED holder from the LED Push the LED back through the front bezel Replacement 1 Push the In Use LED through the front bezel 2 Press the LED holder onto the LED 3 Push the LED and LED holder into the front bezel Secure the In Use LED to the front bezel by slipping the LED collar over the LED holder Ensure that the In Use LED is properly secured in the front bezel refer to the illustration below 4 Place the front bezel on the main frame and secure with two screws COLLAR Figure 21 In Use LED Installation 5 Install the front door assembly and the PCB refer to the Front Door Assembly and the Printed Circuit Board paragraphs IN USE LED Removal 1 Remove the diskette if installed and PCB and front bezel assemblies refer to the Printed Circuit Board and the Front Bezel Assembly paragraphs 2 Cut the tie wrap securing the wires near the base of the transducer cable
30. D ASSEMBLIES AND PARTS LOCATIONS It is recommended that the technician refers to the Illustrated Parts Section to become familiar with the individual components and their exact locations before proceeding further with the MAINTENANCE section 17 MAINTENANCE REMOVAL AND REPLACEMENT PROCEDURES PRINTED CIRCUIT BOARD 1 Disconnect the DC power cable connector J2 the data cable connector J1 the transducer cable connector J3 and the R W head cable connector J4 from the PCB 2 Remove the four screws securing the PCB to the drive Remove the PCB 3 Reverse the procedure for installation FRONT DOOR ASSEMBLY Removal refer to the illustration below 1 Remove the diskette if installed and the PCB refer to the Printed Circuit Board paragraph 2 Remove the two screws securing the front door to the carrier assembly 3 Slide the front door out of the front bezel assembly Installation refer to the illustration below 1 While holding the carrier assembly down slide the front door into the front bezel assembly 2 When the front door is in place the door hinge should rest on the top front edge of the carrier Secure the front door to the carrier with two Screws 3 Install the PCB refer to the Printed Circuit Board paragraph Figure 19 Front Door Installation 18 FRONT BEZEL ASSEMBLY Removal 1 Remove the diskette if installed the PCB and front door assembly refer to the Printed Circuit
31. ECTORS AND CABLES The physical interface between the QumeTrak 542 and the host sytem is made through two connec tors digital I O signals on P1 J1 and DC power on P2 J2 a fast on terminal tab provides for frame ground interconnection The illustration below shows how four disk drives would be connected to the host system drives 1 and 2 have been deleted for clarity Refer to the ELECTRICAL IN TERFACE section for specific pin connections INTERFACE 1 0 SIGNALS QUMETRAK DRIVEO SYSTEM T TERMINATOR IN PCB LOCATION 28 563 A 01 Figure 8 Interface Connection SIGNAL INTERFACE All signals are interfaced through connector P1 J1 Connection to J1 is through a 34 pin PCB edge card connector The dimensions for this con nector are shown in the illustration below KEY SLOT 2 0 036 0 004 BOARD THICKNESS 0 062 0 007 0 063 nom 2x 0 050 nom 0 050 nom 1 795 0 010 DIMENSIONS IN INCHES 0 100 nom Figure 9 Connector J1 Dimensions component side Connector P1 can be for a flat cable or a twisted pair The two tables below list the respective requirements Table 3 Connector P1 Requirements for a Flat Cable CONNECTOR 3463 0001 POLARIZING KEY 3439 0000 TOOL LOCATOR 3443 11 PLATE PLATEN FLAT CABLE 10 FEET MAX INTERFACE Table 4 Connector P1 Requirements for Twisted Pairs CRIMP SOLDER TYPE TYPE PARTS AMP AMP l PIN 583717 5 583717 5 CO
32. LE HUB BEARING SPINDLE PULLEY ASSEMBLY SCREW AND FLAT WASHER Figure 25 Spindle Components Removal and Replacement INDEX SENSOR AND LAMP ASSEMBLIES Removal 1 Remove the diskette if installed the PCB front door assembly and carrier assembly refer to the Printed Circuit Board Front Door Assembly and MAINTENANCE Carrier Assembly paragraphs When removing the carrier assembly note how the two index lamp leads are routed along the carrier 2 Remove the screw and washer securing the index sensor to the main frame Remove the sensor Note how the two sensor leads are routed along the main frame to the transducer cable connector J3 3 Cut the tie wrap securing the wires near the base of connector J3 4 Remove the four index sensor and lamp leads from connector J3 by pushing down on the sensor and lamp lead tabs in the connector with tweezers sensor block to A12 blue to B12 lamp black to A11 white to B11 5 Separate the four index sensor and lamp leads from the transducer cable and remove the sensor and lamp Replacement 1 Install the four index sensor and lamp leads in connector J3 refer to step 4 above Removal Be sure the locking tabs on the leads engage in the connector slots This will prevent the leads from being pushed out when the connector is plugged into the PCB 2 Secure the four leads to the transducer cable with a tie wrap near the base of
33. LER REFER TO NOT READY FLOW CHART REPLACE TK 00 SWITCH CHECK CONTROLLER Figure 34 Seek Error Troubleshooting Flowchart IS DIRECTION SIGNAL ACTIVE J1 18 REPLACE PCB TROUBLESHOOTING CHECK CONTROLLER 37 TROUBLESHOOTING 38 DOES ERROR REPEAT ON SAME DISKETTE CHANGE DISKETTE DOES ERROR REPEAT ON DIFFERENT DISKETTE ARE VOLTAGES AT TP1A 4 TP1B 50mv P P MIN REPLACE HEAD CARRIAGE ASSY VERIFY FIX IS READY LINE ACTIVE J1 34 IS HEAD LOAD ACTIVE 1 4 REPLACE PCB VERIFY FIX REFER TO NOT READY FLOWCHART REPLACE PCB VERIFY FIX REFER TO NOT READY FLOWCHART CHECK CONTROLLER REFER TO NO HEAD LOAD FLOWCHART Figure 35 Read Error Troubleshooting Flowchart ISA NON WRITE PROTECT DISK INSTALLED 15 LOADED YES DOES ERROR REPEAT ON SAME DISKETTE CHANGE DISKETTE DOES ERROR REPEAT ON DIFFERENT DISKETTE ARE VOLTAGES AT TP1A amp TP1B 50mv MIN REPLACE HEAD CARRIAGE ASSY VERIFY INSTALL A NON WRITE PROTECT DISK IS READY LINE ACTIVE 21 34 IS HEAD LOAD ACTIVE J1 4 REPLACE PCB VERIFY FIX REFER TO NOT READY FLOWCHART REPLACE PCB VERIFY FIX REFER TO NOT READY FLOWCHART CHECK CONTROLLER REFER TO NO HEAD LOAD FLOWCHART Figure 36 Write Error Troubleshooting Flowchart TROUBLESHOOTING 39 TROUBLESHOOTING 40 R W HEAD FAILS TO LOAD UNTO DISKETTE 15 STATU
34. NTACT 1 583616 1 583854 3 s 583274 1 583274 1 CRIMP TOOL 90268 1 EXTRACTOR 91073 1 91073 1 TOOL TWISTED PAIR 10 FEET MAX The table below lists the I O signal connector pin assignments Table 5 Signal Connector P1 J1 Pin Assignments SIGNAL SIGNAL SIGNAL NAME RETURN _ 5 _ STANDARD 2 Reserved sd RESERVED HEAD LOAD DRIVE SELECT 3 EINE 0 _____ 12 DRIVESELECT a one woronow x wmecmonsuecr _ 39 __ 2 se 2 a m 28 LEN INN WRITE DATA WRITE GATE TRACK 00 WRITE PROTECT READ DATA SIDE SELECT READY DC POWER DC Power is supplied through connector P2 J2 The two tables below list the cable requirements and connector pin assignments 8 Table 6 Connector P2 J2 Requirements PARTS CABLE SIDE DRIVE a Housing 1 40424 0 1 4a0426 0 CONTACT 4 PINS Comme roor sez EXmacrORTOOL 1 013 2 CABLE 10 FEET MAX Table 7 Power Connector Pin Assignments SIGNAL NAME aa ME 12VDC DNE HN 12 RETURN 5 RETURN 5VDC Figure 10 Connector J2 TERMINATOR The terminator is a DIP resistor module which must be plugged into the DIP socket location 2B on the PCB of a single drive or into the last drive of a daisy chain No other drives in a daisy chain should have terminator resistors
35. Nut Plain Hex Metric 20 94345 01 Transistor Insulator Notes 1 2 4 5 Part of item 1 also available separately Part of item 5 also available separately For illustrated parts breakdown see next section Not available as an assembly See Car riage Stepper Assembly section for il lustrated parts breakdown Items 10 and 11 available as an assy 51078 02 Drive Motor Assembly ILLUSTRATED PARTS 45 ILLUSTRATED PARTS CARRIAGE STEPPER ASSEMBLY 46 DOOR CARRIER ASSEMBLY Item Part No 1 Notes 1 51104 02 51062 01 51103 06 55163 06 51068 01 51077 01 51075 01 55193 22 Description Carrier Subassembly Note 1 Front Door Assembly Index Lamp Assembly Flat Head Screw Screw w Lk Fltwshr 3 Collet Assembly E Ring Washer Screw PH 3 x 6 mm Not available separately Order complete Door Carrier Assembly 51149 02 CARRIAGE STEPPER ASSEMBLY Item Part No 1 2 3 51017 01 51126 01 51007 01 51009 01 51012 01 51014 01 51013 01 55163 08 Description Carriage Assembly Stepper Motor Assembly Track 00 Stop Steel Ball Plate Spring Felt Pad Retainer Screw PH w Lk Fltwshr 3 x 6 mm ILLUSTRATED PARTS 47 DIAGRAMS This section presents reference schematic and in terconnection diagrams for a typical QumeTrak 542 disk drive 49 09
36. Qume Drive 1 WU Cay VN ald T EN S A sasa asses NV e unas rore lini Qa ya a T E JN QurneTr x 542 E Sis 4 FOREWORD This manual is one of several publications which describe the QumeTrak 542 Flexible Disk Drive Each manual covers the disk drive in its entirety but from different aspects Some subjects will be overlapping in some publications This is because the technical format and standard of the text has been maintained directly proportional to the technical level of the potential user Title Publication Number QumetTrak 542 Product Description Manual 36013 Memory Products Service and Spares Catalog 37052 TABLE OF CONTENTS PAGE INTRODUCTION 1 SCOPE nay RE 1 DESCRIPTION pusaqpas Ane E ae ab m c ot EN sS 1 General acea ack naa egt eed ne ee ae 1 Performance 5 1 INTERFACE 2 maU Rd OR See eal 3 ELECTRICAL INTERFACE 3 General 3 VO Signal Interface 3 INPUT LINES sci this clad e Wc Sce a Ae bdo eoa hn yi gc ns 3 boad uyan ox D 3 Drive Select eom de 3 MOIOE ON sz
37. S OF TRACES HL HS AND HM CORRECT 15 120 PRESENT ON HEAD LOAD SOLENOID DOES HEAD LOAD SOLENOID FUNCTION REPLACE HEAD CARRIAGE ATTEMPT HEAD LOAD CORRECT TRACE CONFIGURATION AS NECESSARY ATTEMPT HEAD LOAD IS 12DC PRESENT ON CHECK POWER J2 1 amp J2 2 SUPPLY REPLACE PCB ATTEMPT HEAD LOAD REPLACE HEAD LOAD SOLENOID ATTEMPT HEAD LOAD Figure 37 No Head Load Troubleshooting Flowchart RECOMMENDED SPARE PARTS Tabulated below are the recommended spare parts according to description part number and quantity for supporting the QumeTrak 542 disk drive Refer to the Illustrated Assemblies and Parts Locations paragraph for identification of The Qume Memory Products Service and Spares Catalog publication number 37052 offers a comprehensive list of all QumeTrak 542 replaceable parts and lays down basic service policy parts Table 13 Recommended Spare Parts NUMBER OF DISK DRIVES DESCRIPTION 50 100 250 500 NUMBER OF SPARE PARTS STEPPER MOTOR ASSEMBLY 51126 01 DRIVE MOTOR 51079 02 MOTOR CONTROL BOARD 51082 02 ASSEMBLY PRINTED CIRCUIT BOARD 51004 01 HEAD CARRIAGE ASSEMBLY 51017 01 STEEL BALL 51009 01 51012 01 SPRING PLATE FUR FELT 51014 01 RETAINER 51013 01 HEAD LOAD SOLENOID 51087 01 ASSEMBLY SPINDLE DRIVE BELT 51086 01 COLLET ASSEMBLY 51068 06 INDEX SENSOR ASSEMBLY 51083 01 WRITE PROTECT SENSOR 51185 01 ASSEMBLY TRACK 00 SWITCH 51109 01 41
38. ansducer cable con nector J3 from the PCB 2 Cut the tie wrap securing the wires near the base of connector J3 3 Remove the three track 00 switch leads from connector J3 by pushing down on the switch lead tabs in the connector with tweezers yellow to A8 green to 9 and white to 4 Separate the three track 00 switch leads from the transducer cable by cutting the two tie wraps attached to the main frame under the stepper motor 5 Remove the two screws securing the track 00 switch and base to the main frame 6 Remove the two screws securing the track 00 switch to the switch base Replacement 1 Secure the track 00 switch to the switch base with two screws 2 Install the track 00 switch and base on the main frame and secure with two screws 3 Secure the three track 00 switch leads three motor control board leads and four drive motor leads along the main frame with two tie wraps Attach the tie wraps to the main frame at the two holes under the stepper motor 25 MAINTENANCE 4 Install the three track 00 switch leads in con nector J3 refer to step 3 regarding Removal Ensure that the locking tabs on the leads engage in the connector slots This will prevent the leads from being pushed out when the connector is plugged into the PCB 5 Secure the leads to the transducer cable with a tie wrap near the base of connector J3 6 Install connectors J2 and J3 on the PCB 7 Adjust the track 00 swit
39. ardless of DS status When this option is used a HEAD LOAD signal is required to load the R W head against the diskette or trace HM may be shorted to allow the MOTOR ON signal to load the R W head Head Load Options When shipped from the factory trace HS is shorted on the programmable shunt This allows the R W head to be loaded against the diskette when any jumpered DRIVE SELECT signal line DS0 DS3 is activated There is one other option available FUNCTION NORMALLY SHORTED FUNCTION OPEN HEAD LOAD FROM DRIVE SELECT HEAD LOAD NOT CONTROLLED BY DRIVE SELECT DRIVE SELECTED WHEN PIN 10 DRIVE NOT SELECTED WHEN PIN 10 15 ACTIVE IS ACTIVE DRIVE SELECTED WHEN PIN 12 DRIVE NOT SELECTED WHEN PIN 12 IS ACTIVE IS ACTIVE DRIVE SELECTED WHEN PIN 14 DRIVE NOT SELECTED WHEN PIN 14 IS ACTIVE IS ACTIVE DRIVE SELECTED WHEN PIN 6 DRIVE NOT SELECTED WHEN PIN 6 IS ACTIVE IS ACTIVE HEAD LOAD FROM MOTOR ON SIGNAL HEAD LOAD NOT CONTROLLED BY MOTOR ON SIGNAL NORMALLY OPEN WHEN SHIPPED FROM THE FACTORY DRIVE SELECT WILL BE ALLOWED FROM DSO DS3 Option Trace HM shorted trace HS open This allows the R W head to be loaded against the diskette when the MOTOR ON signal is activated Stepper Motor Power Options refer to the illustration below When shipped from the factory jumper PM is installed This arrangement supplies DC power to the stepper motor when the MOTOR ON signal is activated Two other options are availab
40. ch refer to the ADJUST MENTS section HEAD CARRIAGE ASSEMBLY Removal refer to the illustration below 1 Remove the diskette if installed the PCB and the door carrier assembly refer to the Printed Cir cuit Board and Carrier Assembly paragraphs CAUTION The R W heads must not be allowed to come together Insert a clean piece of paper between the head surfaces 2 Remove the two R W head cables connector J4 from the right media guide as viewed from the front of the disk drive Note the way the cables are attached to the guide for later replacement 3 Cut the tie wrap securing the wires near the base of connnector J3 4 Remove the six stepper motor leads from con nector J3 by pushing down on the motor lead tabs in the connector with tweezers black to 5 yellow to A6 brown to A7 red to B5 red to B6 and orange to B7 5 From the underside of the carriage assembly remove the two Phillips head screws and washers that secure the retainer plate spring steel ball and carriage to the shaft of the stepper motor 6 Remove the two Phillips head screws lock washers and flat washers that secure the stepper motor to the main frame Lift the stepper motor and carriage free 7 Slide the carriage from the shaft of the stepper motor and remove CARRIAGE ASSEMBLY SOCKET HEAD SCREW TRACK OO STOP STEPPER COLLAR Figure 28 Stepper Motor and Head Carriage Removal and Installation 26 REPLACEMENT
41. connector J3 3 Remove the two In Use LED leads from con nector J3 by pushing down on the LED lead tabs in the connector with tweezers black to A10 red to B10 refer to the illustration below Figure 22 Connector Lead Removal typical 4 Separate the two In Use LED leads from the transducer cable and remove the LED as des cribed in the front bezel assembly removal para MAINTENANCE graph Note the routing of the leads along the cable for later replacement Replacement 1 Install the two In Use LED leads in connector J3 refer to step 3 Removal Ensure that the locking tabs on the leads are properly engaged in the connector slots This will prevent the leads from being pushed out when the connector is plugged into the PCB 2 Secure the two leads to the transducer cable with a tie wrap near the base of connector J3 3 Route the In Use LED leads along the transducer cable 4 Install the In Use LED in the front bezel refer to the Front Beze Assembly Replacement para graph Install the front beze on the main frame 5 Install the PCB refer to the Printed Circuit Board paragraph MEDIA GUIDES Removal 1 Remove the diskette if installed and the PCB refer to the Printed Circuit Board paragraph 2 Remove the two R W head cables connector J4 from the right media guide as viewed from the front of the disk drive Note how the cables are attached to the guide for later replacement 3 Remove
42. d at least one millisecond follow ing a write operation to assure that the track is ful ly tunnel erased Refer to the Control and Data Timing Re quirements illustration for the timing relation ships Side Select SIDE SELECT defines which surface of a two sided diskette is to be accessed for data recor ding or retrieval An active low level on this line pin 32 selects the R W head for side 1 of the diskette the diskette surface that faces the PCB a high level selects the R W head for side 0 of the diskette the diskette surface that faces the main frame When switching from side to side a 100 microsecond delay is required before any read or write operation can be initiated OUTPUT LINES There are five active low TTL output lines The low true voltage level is 0 to 0 4 volt with a maximum sink of 48 milliamps when the 7438 NAND buffers draw current The high false voltage level is 2 4 to 5 25 volts with a maximum leakage current of 250 microamps when the 7438 NAND buffers are at cutoff The characteristics of the individual out put lines are described below INTERFACE POWER ON MoroRON _ l E DRIVE SELECT VALID TRACK 00 AND WRITE PROTECT OUTPUT 500 ns max 1 ms min VALID INDEX EN 1 sec max DIRECTION SELECT 500 ns max 1 min SIDE SELECT 35 ms min 1 ms cima ug im 50 ms min 1 sec min WRITE DATA 100us 35 ms min
43. deline for determining the de gree of R W head alignment integrity The entire head carriage assembly is factory adjusted and tested there is no field adjustment Replace the entire assembly if defective 1 Set the oscilloscope as follows VOLTS DIV CH1 CH2 50 mv VAR KNOB CH1 amp CH2 CAL CH2 INVERT VERT MODE ADD ACIGND DC CH1 amp CH2 AC HORZ DISPLAY A TRIG MODE NORM TRIG COUPLING AC AIB TIME DIV 0 5 ms SLOPE SOURCE EXTERNAL 2 Power up the disk drive 3 Install CE diskette Q P N 51201 01 in the 31 ADJUSTMENTS AND CHECKS disk drive and step the head carriage IN to TRACK 34 Activate SIDE SELECT O 4 Connect the oscilloscope channel probes 1 and 2 to TP1A and TP1B R W head signals re spectively and the trigger probe to TP3 Index on the PCB Connect the probe ground leads to the GND test point 32 5 Observe the oscilloscope for a pattern similar to that shown in the Azimuth Check illustration 6 Activate SIDE SELECT 1 and repeat step 5 7 Disconnect the oscilloscope probes from the PCB and remove the diskette from the drive Pow er down the disk drive ADJUSTMENTS AND CHECKS MAXIMUM 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
44. e pin 4 loads the R W head against the diskette In some applica tions HEAD LOAD is a Customer Strappable Option DRIVE SELECT 0 3 An active low level on this line pin 6 10 12 or 14 enables communication between an individual drive and the controller The QumeTrak 542 is shipped from the factory as shown in the Factory Configuration table This allows the user to configure the drive to operate in a single or multiple drive system Four separate input lines are provided for the using system to select the right drive on the interface When two three or four drives are daisy chained each drive must have a unique DRIVE SELECT address The DRIVE SELECT address is controlled by a pro grammable shunt When trace DSO on the pro grammable shunt is shorted the drive will be ac tivated by an active low signal on the DRIVE SELECT 0 line If trace DS1 is shorted the drive will be activated when the DRIVE SELECT 1 line is active low The same system applies to traces DS2 and DS3 Refer to the Drive Select table below NOTE Only one trace can be shorted within a single drive Each drive within a daisy chain must have a unique DRIVE SELECT number Table 2 Drive Select Programmabie Shunt low level H high level S short open don t care MX shorted INTERFACE CONTROLLER QUMETRAK 542 SIGNAL CONNECTOR P1 J1 HEAD LOAD DRIVE SELECT 3 INDEX DRIVE SELECT 0 TRACK OO DRIVE SELECT 1 WRITE
45. e Printed Circuit Board paragraph 9 Adjust the track 00 switch track 00 stop and the stepper motor as necessary refer to the Adjustments section ADJUSTMENTS AND CHECKS GENERAL The test equipment and tools required for adjustment of the QumeTrak 542 are tabulated below Table 12 Test Equipment and Tools Required OSCILLOSCOPE TEKTRONICS 465 OR EQUIVALENT EXERCISER SYSTEM CONTROLLER OR DRIVE EXERCISER TESTER CE DISKETTE 51201 01 FEELER GAUGE PHILLIPS SCREW DRIVER 2 0 027 INCH 0 7 mm 1 HEAD 4 INCH ALLEN DRIVER 1 5 mm e e SHANK 2 HEAD 4 INCH SHANK FLAT HEAD 4 INCH SHANK SCREWDRIVER CAUTION The R W heads must not be allowed to come together without a diskette or clean piece of paper inserted between the head surfaces DRIVE MOTOR ADJUSTMENT The QumeTrak 542 drive motor speed can be visually verified by referencing the effect produced by the decal on the spindle pulley The decal has two scales a 50 Hz and a 60 Hz scale for use under artificial light produced by 50 Hz or by 60 Hz voltage To check and or adjust the drive motor speed proceed as follows 1 Position the drive on its side in a well lighted area Good lighting is important to ensure that the strobing effect produced by the decal is easily recognized Ensure that only fluorescent or neon lighting is used as incandescent lighting will not be effective 2 Install a
46. ead carriage on the closest even numbered track that affords an approximate 5 pattern Note the relationship in amplitude between LOBES A and B 6 Go to TRACK 40 then step OUT to the track where the 15 pattern is observed Note the LOBE A vs LOBE B relationship 29 ADJUSTMENTS AND CHECKS LOBE B EQUAL AMPLITUDE LOBE A IS 70 OF LOBE B LOBE B IS 70 OF LOBE A 415 A 01 Figure 29 5 Pattern 7 For optimum performance LOBE A should equal LOBE B If in either direction the amplitude of the smaller lobe is less than 709 of the taller one the head alignment needs to be adjusted If adjustment is necessary average the two noted readings Loosen the two stepper motor mounting screws and while observing the oscilloscope slowly rotate the stepper motor into a position where the relationship of LOBE A vs LOBE B is corrected by the computed average This procedure compensates for any mechanical tolerance in head track alignment between stepping IN and OUT Secure the mounting SCrews 8 Repeat steps 5 6 and 7 above 9 Disconnect the oscilloscope probes from the PCB and remove the diskette from the drive Power down the disk drive TRACK 00 SWITCH ADJUSTMENT 1 Verify head alignment refer to the HEAD ALIG NMENT ADJUSTMENT paragraph steps 1 through 8 2 Single step the head carriage OUT to locate the head on TRACK 00 3 Remove the
47. h soldering equipment remove the four drive motor leads from the motor control board 1 yellow 2 red 3 green and 4 blue Numeric references are indicated on the component side of the board refer to the illustration below MOUNTING MOTOR CONTROL BOARD LEADS MOTOR CONTROL BOARD DRIVE MOTOR LEADS 413 A 03 Figure 27 Motor Control Board Drive Motor Leads 7 Remove the motor control board Replacement 1 With soldering equipment secure the four drive motor leads to the motor control board refer to step 6 Removal 2 Install the motor control board on the main frame and secure with three screws Ensure thata nylon screw is used for the heat sink 3 Secure the three motor control board leads four drive motor leads and two track 00 switch leads along the main frame with two tie wraps Attach the tie wraps to the main frame at the two holes under the stepper motor 4 Install the three motor control board leads in connector J3 refer to step 3 regarding Removal Ensure that the locking tabs on the leads engage in the connector slots This will prevent the leads from being pushed out when the connector is plugged into the PCB 5 Secure the leads to the transducer cable with a tie wrap near the base of connector J3 6 Install connectors J2 and J3 on the PCB 7 Adjust the drive motor refer to the ADJUST MENTS section _ DRIVE MOTOR Removal 4 Remove the diskette if installed
48. he interface and controller programming are viable TROUBLESHOOTING FLOWCHARTS In order to use the troubleshooting flowcharts with optimum efficiency it is necessary to have the following equipment e A diskette of known integrity CE diskette Q P N 51201 01 may be helpful e Multimeter 20 000 ohms volt e Oscilloscope dual trace 35 TROUBLESHOOTING 15 DISKETTE INSERTED PROPERLY DOES MOTOR TURN DISKETTE 12V J2 1 5V J2 4 DOES SPINDLE AND COLLECT TURN FREELY ARE STRAPPABLE OPTIONS CORRECT 15 DRIVE SELECT LINE ACTIVE J1 6 10 12 14 IS INDEX LINE ACTIVE 41 8 36 RE INSERT DISKETTE VERIFY FIX 15 MOTOR ON SIGNAL ACTIVE J 1 16 VERIFY ANY MECHANICAL BINDS REPLACE DRIVE VERIFY OPTIONS RE CONFIGURE AS NECESSARY CHECK CONTROLLER CHECK TP3 FOR INDEX PULSE EVERY 200ms 1 5 Figure 33 Not Ready Troubleshooting Flowchart CHECK CONTROLLER 15 READY LINE ACTIVE J 1 34 VERIFY DRIVE READY 15 INDEX PULSE PRESENT REPLACE PCB CHECK INDEX SENSOR OPERATION REPLACE PCB DOES HEAD CARRIAGE RESTORE TO TK 00 DOES HEAD CARRIAGE RETURN TO TK 39 INPUT ACTIVE J1 6 10 12 14 1S READY SIGNAL ACTIVE J 1 34 15 00 SWITCH FUNCTIONING 15 STEP SIGNAL ACTIVE J1 20 REPLACE PCB MECHANICAL BIND IN HEAD CARR ASSY OR STEP MOTOR REPLACE STEP MOTOR ADJUST HEAD CARRIAGE ASSY CHECK CONTROL
49. i ated with any of the above errors TROUBLESHOOTING TECHNIQUE Effective troubleshooting should always begin with a visual inspection Look for such things as faulty wiring damaged or misaligned components and the presence of any foreign matter such as dust Inspect for anything that can obviously alter performance of the drive Next proceed to isolate the problem to the dis kette drive or controller Malfunctions that are dis kette related can be easily detected by comparing the performance of the suspect diskette to one known to be in good condition Most diskette problems can be attributed to either soft or hard errors Soft errors resulting from contamination by dust and or body oil on the diskette surface are usually caused by careless handling Soft errors diminish the accurate read write capability of the diskette but do not necessarily render the diskette unusable Conversely hard errors caused by such things as scratches and abrasions permanently damage the medium Likewise the drive unit can be determined defec tive or not by exchanging the original unit with that is known to be operable Verify that the drive is installed correctly Specifically check to see that the voltage requirements are supplied and that the strappable options are correctly plac ed Proceed to the troubleshooting flowcharts for further isolation of a drive unit fault Once the drive unit is found to be functional verify that t
50. ive in the chain as described above under For One Drive Configure the second drive in the chain as follows Short trace DS2 and open traces DSO DS1 and DS3 Solder one wire jumper across pads B3 anda second jumper across pads A This configuration allows the second drive to be addressed as two single sided drives drive 2 and 3 where DS2 selects the drive and diskette side 0 and DS3 selects the drive and diskette side 1 To assure reliable side selection between side 1 of the first and second drive pin 32 of the W O Signal Connector J1 on the second drive must remain disconnected NOTE In any multi drive daisy chain configuration the terminator resistor pack must be removed from the socket in PCB location 2B on all but the last drive of the chain MAINTENANCE PREVENTIVE MAINTENANCE Under normal conditions the QumeTrak 542 does not require periodic adjustment However cleanliness is extremely important for the proper maintenance of the disk drive Always look for dirt and corrosion as well as wear tear binds and loose connections CAUTION The head carriage is a factory adjusted and tested assembly Do not try to repair this internal component Keep the disk drive as dirt free as possible Place the unit in a clean plastic bag or a sealable box for storage Occasionally dirt may build up on the shafts of the stepper motor assembly Remove the dirt with a clean lint free cloth The entire drive
51. le Option 1 Jumper PS installed jumper PM removed This arrangement supplies power to the stepper motor whenever the drive is selected Option 2 No jumpers installed This arrangement supplies power to the stepper motor whenever the drive is powered up 15 CUSTOMER STRAPPABLE OPTIONS DRIVE SELECT JUMPER MOTOR ON JUMPER Figure 18 Stepper Motor Power Option Connections Side Select Options A high SIDE SELECT signal level determines that the diskette side 0 is accessed when a drive is selected via DSO 3 shorted trace address line or via shorted MX trace Under these drive select conditions side 1 is selected by an active low SIDE SELECT signal This is applicable for single drive systems as well as up to four daisy chained drives For a single drive system and for a two drive daisy chain one other option of side selection is available Option When configuring a drive refer to the PCB Trace Jumper Locations illustration and to the Programmable Shunt Trace Functions table 16 For one drive Short trace DSO and open traces DS1 3 of the programmable shunt Solder one wire jumper across pads B1 and a second jumper across pads A This configuration allows the double sided drive to be addressed as two single sided drives drive 0 and 1 where DSO selects the drive and diskette side 0 and DS1 selects the drive and diskette side 1 For two daisy chained drives Configure the first dr
52. me s Hayward Cal ifornia facility cover mechanical and electronic theory of operation field and service depot level troubleshooting subassembly removal and replacement procedures mechanical and elec tronic adjustments and service checks and pre ventive maintenance Detailed information on cus tomer training classes is contained in the Memory Products Service and Spares Catalog publication number 37052 CUSTOMER STRAPPABLE OPTIONS GENERAL A user can modify the QumeTrak 542 by altering stepper power pins The following table shows the some of the functions described in the configuration of the option traces and jumpers INTERFACE section These modifications are when shipped from the factory The illustration on made by adding or deleting jumpers on the pro the next page depicts their location on the disk grammable shunt side select trace pads and or drive PCB Table 9 Factory Configuration of the Option Traces and Jumpers TRACE JUMPER DESCRIPTION FROM FACTORY DESIGNATOR onvestiecranonessom o one seer aooness ema one serecraoonessemiy ono OO STEPPER MOTOR POWER FROM MOTOR ON X SIGNAL STEPPER MOTOR POWER FROM DRIVE SELECT SIGNAL A B1 B3 SIDE SELECT FOR DOUBLE SIDED DRIVES FROM DRIVE SELECT SIGNAL NOTE When shipped from the factory pin P is normally jumpered to pin M in order to supply DC power to the steppe
53. minates the need for AC power to the unit The QumeTrak 542 is also equipped with a door interlock which ensures that the door does not close unless the diskette is properly inserted The QumeTrak 542 weighs only three pounds 1 4 kg and can be mounted three drives horizontally or four drives vertically in a standard 19 inch rack and panel unit Refer to the INSTALLATION section for additional information Standard Features on the QumeTrak 542 include Low heat dissipation Four drive daisy chain capability Internal write protect circuitry In Use LED activity indicator on the front panel The QumeTrak 542 has interface compatibility with the Shugart SA450 disk drive and complies with the American National Standards Institute ANSI interface specifications for 5 25 inch flexible disk drives PERFORMANCE SPECIFICATIONS The QumeTrak 542 provides a formatted storage capacity of 143 4K bytes on a two sided single density flexible diskette and 286 7K bytes on a two sided double density flexible diskette Refer to the table below for additional performance specifications INTRODUCTION Table 1 Performance Specifications SINGLE DENSITY DOUBLE DENSITY CAPACITY PER DISK UNFORMATTED 250K bytes 500K bytes FORMATTED 163 8K bytes 327 7K bytes 16 SECTORS TRACK TRACK NO 39 we Pw wem m ee AVERAGE TRACK TO TRACK SETTLING HE
54. n the collet access hole and the head access slot in the diskette sleeve refer to the illustration below For 40 track diskettes this distance is 5 16 inch It is advisable that dou ble sided R W certified diskettes are used single sided diskettes however may be used 40 TRACK DISKETTE WRITE ENABLE NOTCH COLLET ACCESS HOLE sete 5 16 INCH 7 HEAD ACCESS SLOT Figure 16 40 Track Diskette Insert the diskette into the drive head access slot first and with the diskette label facing towards the open door close the drive door 12 CAUTION Do not open the drive door while the In Use LED on the drive front is illuminated Handle diskettes with care Never bring a diskette near a magnetic field or touch the diskette sur face exposed by the head access slot Protect the diskette from dust dirt direct sunlight and temperatures outside the manufacturer recom mended safe range Avoid bending creasing or writing on the diskette sleeve with pencil or ball point pen WARRANTY SERVICE AND TRAINING WARRANTY AND SERVICE The basic Qume service policy terms conditions and prices for repairs are specifically described in related to the Memory Products Service and Spares Catalog publication number 37052 For specific warranty details refer to your QumeTrak 542 purchase contract TRAINING Qume offers depot service training on the QumeTrak 542 Disk Drive These regularly scheduled classes held at Qu
55. per motor shaft with a 1 5 mm allen driver Move the stop until it af fords the proper gap and secure in place INDEX SENSOR ADJUSTMENT 1 Set the oscilloscope controls as follows VOLTS DIV CH1 amp CH2 50 MV VAR KNOB CH1 amp CH2 CAL CH2 INVERT VERT MODE ADD AC GND DC CH1 amp CH2 AG HORZ DISPLAY A TRIG MODE NORM TRIG COUPLING AG AIB TIME DIV 0 2 ms SLOPE t SOURCE EXTERNAL 2 Power up the disk drive 3 Install a CE diskette Q P N 51201 01 in the disk drive 4 Connect the oscilloscope channel probes 1 and 2 to and TP1B R W head signals respective ly and the trigger probe to TP3 Index on the PCB Connect the probe ground leads to the GND test point 5 Step the head carriage IN to TRACK 01 ADJUSTMENTS AND CHECKS 6 Observe the following index burst pattern on the oscilloscope Figure 31 Index Burst Pattern 7 If the index burst occurs 400 us 200 us after the start of the index pulse no adjustment is necessary Otherwise loosen the index sensor mounting screw Place the blade of a screwdriver between the sensor and the main frame and gently move the sensor into proper adjustment 400 200 LS while monitoring the oscilloscope Tighten the mounting screw 8 Disconnect the oscilloscope probes from the PCB and remove the diskette from the dirve Pow er down the disk drive AZIMUTH ALIGNMENT CHECK The AZIMUTH ALIGNMENT CHECK procedure is presented as a gui
56. r motor 13 CUSTOMER STRAPPABLE OPTIONS J4 ol t en lt m co x QO QN EEG qp uq 4 p Ee pg STEPPER POWER Pa CURRENT DINNER a TERMINATOR O pg O ami meme we SIDE SELECT lt cee ROGAN ARE SHUNT 2959522 J1 Figure 17 PCB TracelJumper Locations 14 INCORPORATION OF OPTIONS PROGRAMMABLE SHUNT A 14 pin programmable shunt is provided for the seven commonly used trace cut options All these traces except trace HM are normally CUSTOMER STRAPPABLE OPTIONS shorted before being shipped from the factory The shorted and open functions of the pluggable options are tabulated below Table 10 Programmable Shunt Trace Functions DRIVE WILL BE SELECTED INDEPENDENT OF DSO DS3 Drive Select Options Traces DSO through DS3 of the programmable shunt allow for up to four drives to be addressed in a daisy chain arrangement If DS1 through 053 are opened while DSO remains shorted in a drive it designates this drive as number zero the first drive in the chain Moving the short to any one of the three remaining locations DS1 3 while all other DS locations are opened designates the drive for the corresponding position number One other option is available Option Trace MX shorted This option may be used ina one drive system and causes the drive to be selected whenever power is applied reg
57. re that the locking tabs on the leads engage in the connector slots This will prevent the leads from being pushed out when the connector is plugged into the PCB 2 Secure the two leads to the transducer cable with a tie wrap near the base of connector J3 3 Route the two head load solenoid leads along the main frame and install the solenoid Slide the metal solenoid arm under the head carriage arm Ensure that the key at the bottom of the solenoid is in the main frame slot 4 Secure the head load solenoid with a screw 24 5 Install the left media guide the carrier assem bly front door assembly and PCB refer to the Media Guides Carrier Assembly Front Door Assembly and Printed Circuit Board paragraphs MOTOR CONTROL BOARD Removal 1 Remove the diskette if installed the DC power cable connector J2 and transducer cable connector J3 from the PCB 2 Cut the tie wrap securing the wires near the base of connector J3 3 Remove the three motor control board leads from connector J3 by pushing down on the control board lead tabs in the connector with tweezers blue to A1 red to B1 and black to B2 4 Separate the three motor control board leads from the transducer cable by cutting the two tie wraps attached to the main frame under the stepper motor 5 Remove the three screws securing the motor control board and the heat sink to the main frame Make sure that a nylon screw is used for the heat sink 6 Wit
58. should be checked for the need of cleaning every six months Always use a clean lint free cloth for cleaning any part of the drive At this time relubricate the stepper motor shaft carriage assembly tracking mechanism by placing one drop of light lubricating oil Q P N 55279 01 through the hole in the ball bearing retainer onto the felt pad that maintains the steel ball lubricated The retainer is below the carriage assembly and is accessible from the underside of the drive refer to the Stepper Motor and Head Carriage Removal and Installation illustration A general service check should be made on the QumeTrak 542 once every 3000 power on hours 12 months The servicing of each assembly is de scribed in the following section During the ser vice check inspect the main frame for loose con nectors switches and other components Secure all loose parts properly Inspect the drive belt for frayed or weakened areas Replace the belt if it is worn or otherwise damaged FLAT HEAD 4 INCH SHANK SCREWDRIVER MAINTENANCE TOOLS The tools tabulated below are required for general maintenance of the QumeTrak 542 These tools are available at most hardware stores Table 11 Maintenance Tools TOOL SIZE LENGTH PHILLIPS 1 HEAD 4 INCH SCREWDRIVER 2 SHANK 2 HEAD TWEEZERS 4 TO 6 INCHES NEEDLE POINT 4 INCH SHANK SOLDERING EQUIPMENT CE DISKETTE Q P N 51201 01 LIGHT OIL Q P N 55279 01 706 A 01 ILLUSTRATE
59. tall the left media guide on the main frame Ensure that the write protect lamp leads are routed between the guide and the main frame through the indentation on the guide 6 Secure the media guide to the main frame with two screws 7 Install the PCB refer to the Printed Circuit Board paragraph CARRIER ASSEMBLY Removal refer to the illustration below 1 Remove the diskette if installed the PCB and the front door assembly refer to the Printed Circuit Board and Front Door Assembly paragraphs 2 Push the index lamp out of the carrier assembly 3 Remove the index lamp lead from the carrier assembly Note how the lead is routed along the carrier for later replacement 4 Remove the two screws securing the carrier to the main frame 5 Carefully slide the carrier out from under the head carriage arm and remove the carrier assembly LAMP LEADS CA f 227 NY t 22 INDEX LAMP w MAINTENANCE Figure 23 Carrier Assembly Removal and Replacement Replacement refer to the illustration above 1 Carefully install the carrier assembly under the head carriage arm and into position on the main frame Secure the carrier with two screws 2 Route the index lamp lead along the carrier as shown and install the lamp on the carrier 3 Install the front door assembly refer to the Front Door Assembly paragraph 4 Adjust the carrier stop screw for a R W head gap of 0
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