Qume Trak 542 User manual

2350 Qunv3' Drive
,~
June "19.23

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
QumeTrak 542 Product Description Manual
Memory Products Service and Spares Catalog
Publication Number
36013
37052

ii
TABLE OF CONTENTS
PAGE
INTRODUCTION ' " 1
SCOPE 1
DESCRIPTION 1
General " 1
Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. " 1
INTERFACE '" 3
ELECTRICALINTERFACE 3
General " " 3
I/O Signal Interface " 3
INPUT LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 3
Head Load
'" 3
Drive Select
0-3 3
MotorOn 5
Direction Select 5
Step 5
Write Data 5
Write Gate ................................................
.. 5
Side Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 5
OUTPUT LINES. ..............................................
.. 5
Index 6
Track
00 ~' 7
Write Protect. ..............................................
.. 7
Read Data
.. , 7
Ready 7
PHYSICAL INTERFACE ........................................
.. 7
Connectors and Cables. ......................................
.. 7
I/O Signal Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7
DC Power 8
Terminator 8
Frame Ground 8
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
RECEIVING AND INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
INSTALLATION REQUiREMENTS 10
MOUNTING
11
Mechanical Dimensions 11
Recommendations 11
PROPER DISKETTE USE 12
WARRANTY, SERVICE
AND TRAINING 12
Warrantyand Service 12
Training 12
CUSTOMER STRAPPABLE OPTIONS 13
GENERAL 13
INCORPORATION
OF OPTIONS 15
Programmable Shunt 15
Drive Select Options 15
Head Load Options 15
Stepper MotorPowerOptions 15
Side Select Options 16

TABLE OF CONTENTS -CONTINUED
PAGE
MAINTENANCE .. "." " " 17
PREVENTIVE
MAINTENANCE ,17
MAINTENANCE TOOLS 17
REMOVAL AND REPLACEMENT PROCEDURES , . " , ,,18
Printed Circuit Board ,18
Front Door Assembly _18
Front Bezel Assembly " , 18
In Use LED _, , . , , . - - , , _ , 19
Media Guides ,,19
Write Protect Sensor and Lamp Assembly "20
Carrier Assembly 20
Collet Assembly 22
Spindle Components _22
Index Sensor and Lamp Assemblies _23
Head Load Solenoid Assembly _24
Motor Control Board _24
Drive
Motor _25
Track 00 Switch Assembly 25
Head Carriage Assembly 26
Stepper Motor 27
ADJUSTMENTS
AND CHECKS '" 29
GENERAL 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
TROUBLESHOOTING 35
GENERAL 35
DEFINITION OF
QUMETRAK 542 FUNCTIONAL ERRORS 35
Not Ready 35
Seek Error 35
Read Error
35
Write Error 35
No Head Load 35
TROUBLESHOOTING
TECHNIQUE ,35
TROUBLESHOOTING FLOWCHARTS
35
RECOMMENOED SPARE PARTS .. , . " , 41
ILLUSTRATED PARTS , , , 43
iii

FIGURE
LIST OF ILLUSTRATIONS
TITLE PAGE
iv
1 Recommended Controller Interface Circuit 3
2
Interface Connections 4
3
Step Timing 5
4
Write Data Timing for Frequency Modulation (FM) "5
5 Control and Data Timing Requirements " 6
6
Index Timing 6
7Read Data
Timing 7
8
Interface Connection 7
9
Connector J1 Dimensions (component side) " 7
10
Connector J2 "8
11 Unpacking the Disk Drive " 9
12
QumeTrak 542 - Top View 11
13 QumeTrak 542 - Side View 11
14 QumeTrak 542 - Bottom View 11
15 Disk Drive Mounting 11
16 40 Track Diskette 12
17 PCB
Trace/Jumper Locations 14
18
Stepper Motor Power Option Connections 16
19
Front Door Installation 18
20 In Use LED Removal 18
21 In Use LED Installation 19
22
Connector Lead Removal (Typical) 19
23 Carrier Assembly Removal and Replacement 21
24 Collet Assembly Removal and Replacement 22
25
Spindle Components Removal and Replacement 23
.26 Index
Sensor Installation 23
27
Motor Control Board -Drive Motor Leads 24
28
Stepper Motor and Head Carriage Removal and Installation 26
29
"Cats-eye" Pattern 30
30
Track 00 Stop Adjustment 31
31 Index Burst Pattern 31
32 Azimuth Check 33
33
Not Ready Troubieshoooting Flowchart 36
34 Seek Error
Troubleshooting Flowchart 37
35 Read Error
Troubleshooting Flowchart 38
36
Write Error Troubleshooting Flowchart 39
37
No Head Load Troubleshooting Flowchart 40

TABLE
1
2
3
4
5
6
7
8
9
10
11
12
13
LIST OF TABLES
TITLE PAGE
Performance Specifications " .. ".. 2
Drive
Select " ". 3
Connector P1 Requirements for a Flat Cable " " ." 7
Connector P1 Requirements for Twisted Pairs ,,"..... 8
I/O Signal Connector P1/J1 Pin Assignments ". 8
Connector P2/J2 Requirements" 8
Power Connector Pin Assignments. ..................... .. 8
Installation Requirements 10
Factory Configuration of the Option Traces and Jumpers 13
Programmable Shunt Trace Functions 15
Maintenance Tools 17
Test Equipment and Tools Required 29
Recommended Spare Parts 41
v

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 alow 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 aceramic Read/Write
(R/W) head for
long media life. It also uses afield-proven, lead
screw system for
highly accurate and reliable head
positioning. The media drive is a
DC spindle drive
motor. This eliminates
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 astandard 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 QumeT-rak 542 provides aformatted 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 SECTORSITRACK)
RECORDING DENSITY 2938 BPI 5876 BPI
(TRACK NO.
39)
TRACK DENSITY 48 TPI 48 TPI
NUMBER OF CYLINDERS
40 40
NUMBER OF TRACKS
80 80
RECORDING METHOD FM
MFM
ROTATIONAL SPEED 300
RPM 300 RPM
TRANSFER RATE 125K
bits/sec 250K bits/sec
LATENCY (AVERAGE) 100
ms 100 ms
ACCESS TIME
AVERAGE 175
ms
175 ms
TRACK- TO- TRACK 12
ms
12 ms
SETTLING 15
ms
15 ms
HEAD LOAD TIME
50 ms 50 ms
MOTOR START TIME 1
sec 1sec
2

INTERFACE
039-A
I/O SIGNAL INTERFACE
Head Load
An active low level on this line (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.
Only one trace can be shorted within a single
drive. Each drive within a daisy chain must
have a unique DRIVE SELECT number.
Table 2Drive
Select
Drive Drive Select
Input
Programmable
Shunt -
Number
012 3
DSO DS1
DS2 DS3
One
Drive· X X X X00 0 0
0lHH H S0 0 0
1 H L H H 0S00
2HHLH0 0 S0
3HHHL000S
L=
low level, H= high level, S=
short, 0=
open
X= don't care, •=MX
shorted
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 apro-
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 0line.
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--------
TTL
Drive 3
[),owe 0.1;2. Controller
I I I I
-----1-(\\ II \1~1----
IIII -t-5 V
I I I150 ()
~14:1: :1/4 W
7438 or eqUiValent! II
II I
II TTL II
+5 VII
I!
I I I I
IIII
TTL ~---\I n---:;r-
7414 or equi.alen' I! l<J :I l<J
II 7438 I I 7438
IIII
~10 feet max.----i
ELECTRICAL INTERFACE
GENERAL
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 0 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:
The QumeTrak 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.
All the I/O 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.
3

INTERFACE
CONTROLLER QUMETRAK 542
SIGNAL CONNECTOR (P1/J1)
OUND
CTED
OLLER.
DTURN
HEAD LOAD 4
-
DRIVE SELECT 36
-8INDEX
DRIVE SELECT 010 -
26
TRACK 00
DRIVE SELECT 1
1~
28
WRITE PROTECT
DRIVE SELECT 2
1'!,.
30
READ DATA
MOTOR ON 16 14READY
DIRECTION SELECT 18 -
STEP 20
WRITE DATA 22
-
WRITE GATE
24
SIDE SELECT
32
SIGNAL RETURNS
--L
--L
--
--
DC POWER CONNECTOR (P2IJ2)
DC
SIGNAL GR
ROUND +12VDC 1
~
NOTE:
+12V RETURN SIGNAL RETURNS (ALL
00
NUMBERED PINS), +12V RE
+5V RETURN
~
+ 5V RETURN, AND FRAME
GROUND MUST BE CONNE
TOGETHER AT THE CONTR
+5VDC
4
n
rtn
G
AC GROUND FRAME GROUND
391-A
Figure 2. Interface Connections
4

--------NOTE-------.,
When DSO-DS3 are 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
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:
-411---12 ms min.
l,l1S min.
667-A
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:
C=CLOCK
----1: 4.001lS t--I 8.001lS I-- 0= DATA BIT
~ ±10ns \ ±20ns I
! CDC r---~JI C r----
393-A
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. Ahigh level on this
line enables the read circuitry. Deactivation of
DRIVE SELECT, and/or changing SIDE SELECT
must be delayed at least one millisecond follow-
ing a write operation to assure that the track is fu 1-
Iy 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 atwo-
sided diskette is to be accessed for d.ata 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 a100
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, witha 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.
5

INTERFACE
6ms
min.
STEP
I
------------(f f
P;...;O;..;W~E;;.;.R..;.._O;;;;..;N~ _ ____'~
MOTOR ON ,lOll ms min.
-----~I -------------(( .... f ------------
DRIVE SELECT
::;...:...:.;.;::::..:::...=.::.=..=..:...-~--,I'------------4r f~_- ....... 1
VALID TRACK 00 jL ~ ~
AN0WRITE PROTECT
OUTPUT 500 ns max. 1
ms min .
.I 11--------\5~\----~--
VAllO INDEX ------1 1--1 sec. me.. I
..;;..;..;.:=-=~----I-j-- ... I ..... -----------l,{f~--------~----
DIRECTION SELECT ~ 500 ns max. I
I ,,.-------«(5
1_8 min. 1 ~ r-
1
"8 min.
SIDE SELECT
-=W
fS I
r--- 35 ms min. 1 ms min. -----f r---
WRITE GATE r---
100
foi
S
min. II
~~W=----"';~~I {J~-I I~-
50 rns min.
1sec. min.
WRITE DATA
100foiS min.--lJ
35ms min.~ I
VALID READ DATA I I
l_v_alJ..~d ..LI __ v_al_id_-.L. ....JIL...._v_al_ld_
I ~ 50 ms min. ---j
~ 1sec. mln.---..j
Figure 5. Control and Data Timing Requirements
INDEX
This interface signal (pin 8) is provided by the
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.
-==t..F 200ms ± 1.5% ---=8--
--- --_ .. _--_.- ---
395-A
Figure 6. Index Timing
6

INTERFACE
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 apro-
tected diskette is installed.
HOST
SYSTEM
aUMETRAK
DRIVE 0
aUMETRAK
,.._ .. DRIVE3
ITI
1._.1
T·TERMINATOR
IN PCB LOCATION
2B
663-A~1
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 areturn to
high level one microsecond later. The timing
characteristics for READ DATA are shown below.
Figure 8. Interface Connection
1/0 SIGNAL INTERFACE
All I/O 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.
397-A
KEY SLOT
~ 2~~ "'0.036 ±0.004
--
BOARD THICKNESS
0.062 :0.007
34
tI ,--
0.450 ±0.010 0.400: 0.010
-.:tlL.- __ u.~lLWJ~ __ ~.J.jJ--JJ..J..L.J -L
jk~t-om. 0;00 nom~.I~: nom.
0.050 nom. ( )
-----1.795 ±0.010
DIMENSIONS
IN INCHES
o
c
c
o
L1",5
I :250n5
I
c
Ready
An
active low level on this line (pin 34) indicates
that the drive is ready to read or write data.
PHYSICAL INTERFACE
CONNECTORS 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.
C :c LEADING EDGE OF BIT CAN BE :t 800 ns
FROM NOMINAL.
o == LEADING EDGE OF BIT CAN BE:t 400 ns
FROM NOMINAL.
Figure 7. Read Data Timing
396-A
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
PARTS 3M PIN
CONNECTOR 3463-0001
POLARIZING KEY 3439-0000
PRESS 3440
CRIMP
TOOL ·LOCATOR 3443-11
PLATE
PLATEN 3442-1
FLAT CABLE (10 FEET 3365-34
MAX.)
7

INTERFACE
Table 4
Connector P1 Requirements for Twisted Pairs
CRIMP SOLDER
TYPE TYPE
PARTS
AMP PIN AMP PIN
HOUSING 583717-5 583717-5
CONTACT 1-583616-1 583854-3
POLARIZING 583274-1 583274-1
KEY
CRIMP TOOL 90268-1 -
EXTRACTOR 91073-1 91073-1
TOOL
TWISTED PAIR AWG 26 AWG 26
(10 FEET
MAX.)
The table below lists the I/O signal connector pin
assignments.
Table 5
I/O
Signal Connector P1/J1 Pin Assignments
SIGNAL
SIGNAL SIGNAL NAME
RETURN
PIN NO. PIN NO. STANDARD
12RESERVED
3 4 HEAD LOAD
5 6 DRIVE SELECT 3
78INDEX
910 DRIVE SELECT 0
11 12 DRIVE SELECT 1
13 14 DRIVE SELECT 2
15
16 MOTOR ON
17 18 DIRECTION SELECT
19
20
STEP
21
22
WRITE DATA
23 24
WRITE GATE
25
26 TRACK 00
27 28
WRITE PROTECT
29
30
READ DATA
31
32
SIDE SELECT
33 34 READY
Table 6
Connector P2/J2 Requirements
P2
J2
PARTS CABLE SIDE DRIVE SIDE
AMP PIN
AMP PIN
HOUSING
1-480424-0
1-480426-0
CONTACT (4 PINS) 60619-1 -
CRIMP TOOL 90124-2 -
EXTRACTOR TOOL
1-305183-2
-
CABLE (10 FEET AWG 18 -
MAX.)
Table 7
Power Connector Pin Assignments
PIN NO.
SIGNAL NAME
1+12VDC
2+12V RETURN
3
+5 RETURN
4
+5VDC
005-8
Figure 10. Connector J2
TERMINATOR
The terminator is aDIP resistor module which
must be plugged into the DIP socket, location 28,
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 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.
DC POWER
DC Power
is supplied through connector P2/J2.
The
two tables below list the cable requirements
and connector pin assignments.
8
FAST-ON TAB
AMPPIN 61664-1
MATING CONNECTOR
AMP PIN 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
~hen 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 evidence of such damage on the invoice and
file ~ claim with t.he carrier immediately, if the
condlton of the Unit so warrants.
7. If 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.
603-A
Figure 11. Unpacking the Disk Drive
9

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
DC POWER VOLTAGE MAX. RIPPLE CURRENT
REQUIREMENTS
(AT THE DC POWER
+12VDC:!:5% 0.1 V(P·P) 1.35A
MAXIMUM 1.8A TYPICAL
CONNECTOR J2)
+5 VDC:!:5%
0.05 V(P-P) 1.0A
MAXIMUM 1.7A TYPICAL
POWER CONTINUOUS: 18.7 WTYPICAL (64 BTUlHR)
DISSIPATION
STAND BY: 7.5 W TYPICAL (25 BTUlHR)
OPERATING STORAGE
TEMPERATURE
5°C TO 43°C -10°C TO 45°C
(41°F TO 110°F) (14°F TO 113°F)
ENVIRONMENT
RELATIVE 20 TO
80% RH
8TO 80% RH
HUMIDITY
MAX. WET BULB
29°C (84°F) NO CONDENSATION
WIDTH 146
mm (5.75 in.)
HEIGHT 82.6 mm (3.25 in.)
MECHANICAL
DEPTH 189.7mm (7.47in)
WEIGHT
1.4 Kg (3 Ib)
MOUNTING
HORIZONTAL FRONT LOAD (PCB SIDE UP ONLY)
POSITIONS VERTICAL FRONT LOAD
VERTICAL TOP LOAD
561-A
10

INSTALLATION
398·A
Figure 12.QumeTrak 542 -Top View
==;;;;;:-:t--_.
I
Figure 14.QumeTrak 542 - Bottom View
r-
5.50 i0.00
RECOMMENDATIONS
The QumeTrak 542 can be mounted in any plane:
horizontal
for front loading and vertical for front or
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).
mI
1&
5.87"::~300
T5.50
2.3 1
~
5.75
II
0
J t-
No. &-32 UNC x0.31dp.
.06 ( 4 PLACES I
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.
PROPERLY INSTALLED
(PCB
UP)
399-A
Figure 13.QumeTrak 542 -Side View
IMPROPERLY INSTALLED
(PCB DOWN)
621·A
Figure 15. Disk Drive Mounting
11

INSTALLATION
PROPER DISKETTE USE
It is paramount that aproper 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 RIW head
damage.
The 40 track diskette to be used in the QumeTrak
542, can be easily identified by noting the
measurement between 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
LABEL
,.------- 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.
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.
COLLET ACCESS HOLE
"/
HEAD ACCESS SLOT
5/16 INCH
40~-A"():
TRAINING
Qume otters depot service training on the
QumeTrak 542 Disk Drive. These regularly
scheduled classes, held at Qume'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.
12

CUSTOMER STRAPPABLE
OPTIONS
GENERAL
Auser can modify the QumeTrak 542 by altering
some of the functions described in the
INTERFACE section, These modifications are
made by adding or
deleting jumpers on the pro-
grammable shunt, side select trace pads, and/or
stepper
power pins. The following table shows the
configuration of the option traces and jumpers
when shipped from the factory. The illustration on
the next page depicts their location on the disk
drive PCB.
Table 9
Factory Configuration of the Option Traces and Jumpers
TRACE/JUMPER DESCRIPTION FROM FACTORY
DESIGNATOR OPEN SHORT
DSO DRIVE SELECT ADDRESS (PIN 10)
X
DS1
DRIVE SELECT ADDRESS (PIN 12) X
DS2
DRIVE SELECT ADDRESS (PIN 14) X
DS3
DRIVE SELECT ADDRESS (PIN 6)
X
HS HEAD LOAD FROM DRIVE SELECT SIGNAL X
MX OPTIONAL DRIVE SELECT X
HM HEAD LOAD FROM MOTOR ON SIGNAL X
P-M
STEPPER MOTOR POWER FROM MOTOR ON
X
SIGNAL
P-S
STEPPER MOTOR POWER FROM DRIVE X
SELECT SIGNAL
A,B1,B3 SIDE SELECT FOR DOUBLE-SIDED X
DRIVES FROM DRIVE SELECT SIGNAL
HL HEAD LOAD X
.---------- NOTE ---------.
When shipped from the factory, pin Pis
normally jumpered to pin Min order to supply
DC power to the stepper motor.
13

CUSTOMER STRAPPABLE 0PTIONS
Ip
o
STEPPER
(HOLD POWER
I ~~. / CURRENn
P -
M-
II I 0
I I
I P
I P
o~
Figure 17. PCB Tr ace/Jumper L
ocations
14