Digital Equipment RK05 Series User manual

RK05
disk drive
maintenance manual
digital equipment corporation magnard.massachuseb

PreliminaryEdition, April 1972
2nd Printing, June 1972
3rd Printing, October 1972
4th Printing, December 1972
Second Edition, February 1973
6thPrinting, October 1973
Third Edition, May 1974
8th Printing, November 1974
Copyright
@ 1972,1973,1974by Digital Equipment Corporation
The material in this manual is for informational
purposes and
is subject to change without notice.
Digital Equipment Corporationassumesno respon-
sibility for any errors which may appear in this
manual.
Printed in
U.S.A.
The following are trademarks of Digital Equipment
Corporation,
Maynard, Massachusetts'
DEC PDP
FLIP CHIP FOCAL
DIGITAL COMPUTER LAB

CONTENTS
Page
CHAPTER 1
CHAPTER 2
CHAPTER 3
GENERAL INFORMATION
......................................
INTRODUCTION 1-1
WARRANTY
........................................ 1-1
........................ SPECIFICATIONS ...... ... ... ... 1-1
.................................
50160 Hz POWER OPTION 1-1
........................... MAJOR ASSEMBLIES AND SYSTEMS 1-1
................................
Controlsand Indicators 1-4
....................................
Spindle and Drive 1-4
....................................
Linear Positioner 1-4
...............................
Cartridge-HandlingSystem 1-4
....................................
Logic Assembly 1-4
Airsystem
....................................... 14
.....................................
Power Supply 14
...................................
Readwrite Heads 1-4
INSTALLATION
..............................
UNPACKING AND INSPECTION 2-1
.................... MECHANICAL INSTALLATION AND CHECKOUT 2-3
CARTRIDGE HANDLING PRACTICES AND PRECAUTIONS
............... 2-6
.......................... CARTRIDGE PACKING AND SHIPPING 2-6
........................... NORMAL OPERATING PROCEDURES 2-7
....................................
CartridgeLoading 2-7
..................................
CartridgeUnloading 2-7 .
INTERFACE
GENERAL .......................................... 3-1
.................................
INPUT INTERFACE LINES 3-1
........................................
RK11-D 3-1
.....................................
Select (4 lines) 3-1
...............................
Cylinder Address (8 lines) 3-1
.........................................
Strobe 3-1
Head Select
...................................... 3-3
Write Protect Set
.................................... 3-3
Write Data and Clock
................................. 3-3
Write Gate
....................................... 3-3
Restore (RTZ)
..................................... 3-3
.......................................
ReadGate 3-3
.................. ...........
OUTPUT INTERFACE LINES .. 3-3
...............................
File Ready (Drive Ready) 3-3
Read. Write. or Seek ReadyIOn Cylinder
....................... 3-3
...................................
Address Accepted 3-3
Address Invalid (Logic Address Interlock)
........... .. .......... 3-3
....................................
Seek Incomplete 3-3
Write Protect Status
.................................. 3-3
......................................
Write Check 3-3
ReadData ....................................... 34
Readclock
....................................... 3-4
iii

CONTENTS (Cont)
CHAPTER 4
................................
Sector Address(4 lines) 34
Sector Pulse ...................................... 34
Indexhlse ....................................... 34
ACLow ........................................ 34
DCLow ........................................ 34
.................................
High Density/RKOS L 3-4
THEORY OF OPERATION
FL!KCTIGBIAL- DESCW"T~OPJ ............................... 4-1
Stat
.......................................... 4-1
Stop
.......................................... 4-1
Track Addressing and Head Positioning
........................ 4-1
Recording Technique
................................. 4-5
LOGICALDESCRIPTION
.................................. 4-5
Power On/Off Sequence
................................ 4-5
.......................................... Start 4-5
..........................................
stop 4-5
Normal Stop
................................... 4-5
L~wSpeedStop
................................. 4-9
AC
LOW Stop .................................. 4-10
DC LOWStop
.................................. 4-10
Disk Drive Addressing
................................. 4-10
RKl 1-D Address Selection
............................ 4-10
RKl
1 -C or K8/E Address Selection ...................... 4-10
Seek
.......................................... 4-10
Load Heads Seek
................................. 4-10
Forward Seek
.................................. 4-11
Reverse Seek
................................... 4-12
Return-to-Zero(Restore) Seek
........................... 4-12
Sector/Index Pulse Generation
............................. 4-12
CARRIAGEPOSITIONING
................................. 4-14
Positioner Servo Description
.............................. 4-14
Velocity Mode
.................................. 4-14
Detent Mode
................................... 4-14
Servo Circuit Description ............................... 4-15
Linear Positioner Transducer
........................... 4-15
A 2e
Velocity Function Generator
.......................... -t. 13
Velocity Synthesizer ............................... 4-16
READ/WRITE
......................................... 4-17
Read Operation
.................................... 4-17
Write Operation
.................................... 4-19
FAULT DETECTION
.................................... 4-20
Current Fault
..................................... 4-20
Positioner Lamp Fault
................................. 4-20
PQWERST-FPI.YDESCRJRION .............................. 4-21

CONTENTS (Con t)
Page
CHAPTER 5
MAINTENANCE
RECOMMENDEDTOOLS AND TEST EQUIPMENT ...-...............a 5-1
PREVENTIVE MAINTENANCE
.............................. 5-1
500-Hour
PM Procedure ................................ 5-1
1.50OmHour
PM Procedure ............................... 5-1
3.000.Hour
PM Procedure ............................... 54
Absolute Filter Removal and Replacement ...................... 5-5
.............................. COWCTmMAIMENmCE 5-5
Linear Positioner
.................................... 5-5
.
Positioner Removal ............................... 5-5
Positioner Kepiacement
............................. 5-5
Carriage
........................................ 5-7
................................ CarriageRemoval 5-7
Carriage Replacement
.............................. 5-8
Carriage Bearing Assembly Removal
....................... 5-8
Carriage Bearing Assembly Replacement
..................... 5-8
Transducer Block Removal and Replacement
.................. 5-10
Readmrite Heads
................................... 5-10
Head Removal. without Head Insertion Tool
.................. 5-10
Head Replacement. without Head Insertion Tool
................ 5-10
Head Removal.with Head Insertion Tool
.................... 5-12
Head Replacement. with Head Insertion Tool
.................. 5-12
Spindle
......................................... 5-13
Spindle Removal
... o, ............................. 5-13
Spindle Replacement
............................... 5-15
SpindleGround (Carbon Brush) Removal and Replacement
........... 5-1 5
Spindle Drive Motor .................................. 5-15
.................................
Motor Removal 5-15
...............................
Motor Replacement 5-15
Drive Belt Removal and Replacement
...................... 5-16
.....................................
Blower Motor 5-17
.................................
Blower Removal 5-17
...............................
Blower Replacement 5-17
Power Supply Removal
................................ 5-17
CartridgeCleaning
................................... 5-17
..........................
Cartridge Cleaning Procedure 5-17
.............................
Adverse Disk Conditions 5-20
ALIGNMENT. CHECKS. AND ADJUSTMENTS
...................... 5-20
..................................
Alignment Cartridges 5-20
.........................
RKOSK-ACAlignment Cartridge 5-20
231
5 CE Test Cartridge Shim Installation .................... 5-21
Servo System Timing Checksand Adjustments
.................-a. 5-21
DynamicOff-Line Checks and Adjustments
................... 5-23
..........................
StaticTestsand Adjustments 5-29
Readmrite Data Separator
(G 180Card) Adjustment
................. 5-29
........................
Readprite Head Check and Alignment 5-30
.........................
RKOSK-AC Alignment Cartridge 5-30
..................................
2315 CE Pack 5-34
Index/Sector TimingAdjustment
........................... 5-37

CONTENTS (Cont)
B
APPENDIX A
APPENDIX B
APPENDIX C
APPENDIX D
APPENDIX E
Figure
No .
RKOSK-AC Alignment Cartridge ......................... 5-37
2315 CE Pack .................................. 5-38
CartridgeReceiver Alignment
............................. 5-39
SPAREPARTS
....................................... 5-40
TROUBLESHOOTING
................................... 5-40
Power Supply
..................................... 542
Controls and Indicators
................................ 542
Mechanical Checks
................................... 543
Electronic Checks
................................... 5-43
GLOSSARYOF RKOS BACKPLANE COMCTIONS
RKSE/RKOS MAINTENANCE
PROGRAM
RKO5/RKll OSCILJATING SEEK PROGRAM
THE RKO5-TA OFF-LINE TESTER
RKOS INTEGRATED CIRCUITS
ILLUSTRATIONS
Title Page
Location of Major Assembliesand Systems ......................... 1-3
Controls and Indicators
................................... 1-6
Spindle and Drive System
.................................. 1-7
Linear Positioner
....................................... 1-7
CartridgeHandling System .................................. 1-8
Airsystem .......................................... 1-9
Head hading
........................................ 1-9
Relationship of Disk Head. Disk. and Contaminants
..................... 1-10
ShippingBracket and ShippingStrap Location ....................... 2-2
RKl
1 Cor RKl 1D Interface Cable Installation ....................... 2-3
Chassis Slide Mounting
.................................... 24
RK81E Interface Cable Installation
............................. 2-5
Controller/RKO5Disk Drive Interface Linesand
Pin Assignments ............... 3-2
Functional Block Diagram .................................. 4-2
Start Flow Chart
....................................... 4-3
Stop Flow Chart
....................................... 44
Seek Flow Chart
....................................... 4-6
Return-to-Zero(Restore) Flow Chart
............................ 4-7
Readwrite Head
....................................... 4-8
SimplifiedReadIWrite Head Circuit
............................. 4-8
Double Frequency hlse
Relationship ............................ 4-8
Control and Interlock Block Diagram
............................ 4-9
.....................................
Sector/Index Timing 4-13
.................................
Servo System Block Diagram 4-15

ILLUSTRATIONS (Cont)
Figure No .
Title Page
.................................
Linear Positioner Transducer 4-15
..............................
SimplifiedPositioner Servo Logic 4-16
......................................
Velocity Profiie -4-17
..............................
Simplified Data SeparatorCircuit 418
.......................................
Read Waveforms 4-19
...........................................
Prefdter 5-1
...................................
AbsoluteFilter Removal 54
.............................
InternalPower Supply Connections 5-6
..........................
Top View of RKO5 with Cover Removed 5-7
.............................
Carriage Bearing Assembly Removal 5-9
................
Readwrite Head Replacement without Head InsertionTool 5-11
..................
Rezd,N rite Xezid Replacementwith nead insertion Tool 5-13
.....................................
Spindle Replacement 5-14
.................................
Carbon Brush Replacement 5-16
...................................
Blower Motor Removal 5-18
....................................
How to Read a Vernier 5-20
......................................
Negligible Rumout 5-21
.....................................
Considerable Runout 5-21
.............................
CE Test Cartridge Shim Installation 5-22
....................
Sine hplitude/Offset and Velocity Offset Waveform 5-26
.............................
Cosine Amplitude/Offset Waveform 5-27
................................
Velocity Amplitude Waveform 5-27
...................................
AccelerationWaveform 5-27
....................................
Full StrokeWaveform 5-28
................................
Full StrokePositionWaveform 5-28
....................................
Outer Limit Waveform 5-28
...........................
RKOSK-ACHead Alignment Waveforms 5-31
................................
Readwrite Head Adjustments 5-33
.........................
23 1 5 CE Pack Head Alignment Waveforms 5-35
....................................
hdex/Sector Waveform 5-38
...............................
Cartridge-to-ReceiverClearance 5-41
................................
Cartridge Receiver Clearances 541
.................................
Troubleshooting Flow Chart 542
.................................
Door Locking Bar Location 544
..................................
Cartridge Seating Elements 54
TABLES
Title Page
.................................
Performance Specifications 1-2
...................................
Controlsand Indicators 1-5
..........................
RecommendedTools and Test'Equipment
5-2
..............................
Preventive Maintenance Schedule 5-3
.....................................
&NOSystem Checks 5-22
..................................
Servo System Adjustments 5-25
vii

1.1 INTRODUCTION
-.
lne XK65 Eis~Erive, which is designed and manufactured
by Digital Equipment Corporation, is a self-contained,
random-access, data storage device that is especially well
suited for use in small or medium-size computer systems,
data acquisition systems, terminals, and other storage
applications. Operational power for this device is provided
by a power supply located within the driye cabinet. The
RK05 is available in four models, each of which operates on
a different power line.
This compact9 lightweight drive uses a highdensity,
singledisk, 12-sector or 16-sector cartridge as its storage
medium. Two movable heads, one flying above the rotating
disk surface and one below, can read or record up to 406
data tracks at 1500rpm. The double-frequency,
nonreturn-to-zero (NRZ) recording method used in this
drive can store up to 25 million bits of on-line data- Data
formatting is governed entirely by the operating system.
With the address select logic contained in each drive, up to
eight RK05 Disk Drives (depending on the type of system)
can be '6daisy-chained" and operated from a single
controller bus.
1.2 WARRANTY
"Removable media involve use, handling and maintenance
which are beyond DECYsdirect control- DEC disclaims
responsibility for performance of the Equipment when
operated with media not meeting DEC specifications or
with media not maintained
in accordance with procedures
approved by DEC. DEC shall not be liable for damages to
the Equipment or to media resulting from such operationaY9
1.3 SPECIFICATIONS
Table 1-1 lists the performance specifications of the RKO5
Disk Drive for the 12-sector cartridge. Wherever applicable,
a second specification pertaining to a 16-sector cartridge is
also listed.
CHAPTER 1
GENERAL INFORMATION
1.4 50160 Hz POWER OPTION
Tine XKG5 Eisk Erive is avaiiabie in the foliowing four
power models:
RKO5-AA 95 to 130Vac @? 60 Hz
RKO5-AB 190to 260 Vac @ 60 Hz
RKO5-BA 95 to 130 Vac @? 50 Hz
RKO5-BB 190to 260 Vac @? 50Hz
Each model is shipped with a complete set of drawings. To
change from 50 to 60 Hz operation requires a different
spindle drive pulley, and the motor must be moved as
described in Paragaph 5.3.5. Changing from 115V to
230 V operation requires that the power connector (P2) be
reconfigured (Paragraph 4.6).
1.5 MAJOR ASSEMBLIES AND SYSTEMS
The RK05 Disk Drive is composed of the following major
assemblies and systems:
Controls and Indicators
Spindle and Drive System
Linear Positioner
Cartridge Handling System
Logic Assembly
@ Air System
Power Supply
ReadIWrite Heads
Figure 1-1 illustrates the locations, and the subsequent
paragraphs describe the functions of each of the major
assemblies and systems*

Table 1-1
Performance Specifications
Characteristic
Storage Medium
TYpe
Disk Diameter
Magnetic Heads
Number
Recording Density and Format
Density
Tracks
Cylinders
Sectors (records)
Bit Capacities (unformatted)*
Per Disk
Per Inch
Per Cylinder
Per Track
Per Sector
Access Times
Disk Rotation
Average Latency
Head Positioning
(including settlingtime)
Bit Transfer
*
Transfer Code
Transfer Rate
Electrical Requirements
Voltage
Power
Starting Current
Model Designation
RK05-AA
RK05-AB
RK05-BA
RK05-BB
Environment
Ambient Temperature
Relative Humidity
Barometric Pressure
Temperature, Change Rate
Temperature, Interchangeable Range
Dimensions and Weight
Width
Depth
Height
Weight
Specification
Single disk magnetic cartridge
14in.
Two
2200 bpi max.
406 (200 plus 3 spares on each side of the disk)
203(two tracks each)
4872 (12 per revolution)/6496 (16 per revolution)
25 million
2040 (max. at inner track)
115,200
57,600
4,80013,844
1500k 30rpm
20 ms (half rotation)
10ms
- for adjacent tracks
50ms
- average
85 ms
- for 200 track movement
Double frequency, nonreturn-to-zero recording
1.44M bits per sec
1 151230Vac @ 50160 Hz  .05 Hz
250 VA
Power only: 1.8
A
Start spindle: 10A (for 2 sec)
95 to 130Vac@60k0.5 Hz
190to 260 Vac
@ 60 k 0.5 Hz
95 to 130Vac @ 50k0.5 Hz
190to 260 Vac @ 50 k 0.5 Hz
50" to 110"
F (10" to 43" C nominal)
8% to 80% (nocondensation)
10,000 ft (3,000 meters) max.
10
F (6C) per hr
30
F ( 17 C)
19in. (48 cm)
26-112 in. (67
cm)
10-112 in. (27 cm)
110
1b (50 kg)
*Some RKl 1-D systems record at 1.54M bitslsec which increases the bit density and capacity accordingly.

POWER-FA1L
HEAD-RETRACT1NG
BATTER
I ES LINEAR POSITIONER
POWER SUPPLY
DUCKBILL
ABSOLUTE
AIR FILLER
(UNDERNEATH
UNIT)
SPINDLE
CARTRIDGE
AIR DUCT
SECTOR
TRANSDUCER
LOGIC ASSEMBLY
Figure 1-1
BLOWER
READ/WRITE
HEADS
SPINDLE
DRIVEMOTOR
CARTRIDGE
RECEIVER
CARTRIDGE
SUPPORTPOSTS
Location of Major Assemblies and Systems

1.5.1 ControlsandIndicators As the drive front door is closed, the cartridge is lowered to
The controls and indicators (Figure 1-2) required for the operating position, and the magnetic coupling again
normal operation are located on the front of the drive engages the disk hub. When the cartridge is in the operating
cabinet. Table 1-2 describes the function of each control or position, the plastic case depresses the cartridge-on switch
indicator. and removes the no-cartridge interlock condition. The
cartridgereceiver should
not hold the cartridge tightly.
1.5.2 Spindle and Drive
The spindle and drive system (Figure 1-3) is composed of
the spindle, spindle drive motor, and the recording disk. A
50160 Hz, split-phase ac motor transfers torque (via the
drive belt) to the spindle drive pulley. Belt tension is
maintained by a tension spring anchored to the baseplate.
The spindle speed is electronically tested by a circuit that
measures the INDEX PTJLSE interval. When the intsruil
increases to approximately 45 ms, indicating an unsafe
speed, the drive
is cycled down. If the RUNILOAD switch
is placed in the LOAD position, ac power is removed from
the motor and the spindle coasts to a halt.
1.5.3 Linear Positioner
The linear positioner (Figure 1-1) consists of the linear
motor, the carriage, the readlwrite heads, and the linear
positioner transducer. To move the readlwrite heads across
the recording disk, dc current is applied to the
bobbin-wound armature (Figure 1-4) of the linear motor.
The resulting magnetic field reacts with a permanent
magnet in the motor housing to either pull the armature
into or force it out of the permanent magnetic field,
depending upon the polarity of the current applied to the
armature. This motion is transferred to the carriage, which
is fastened to the armature. As a result, the readlwrite
heads, which are attached to the carriage, move across the
surface of the disk.
Any carriage movement is detected by the linear positioner
transducer, which is located on the underside of the
carriage. The transducer output is used with the control
logic to determine the cylinder position of the heads, and in
the servo logic togovern the speed of carriage travel.
1.5.4 Cartridge-Handling System
The cartridge-handling system (Figure 1-5a) consists of a
cartridge receiver, two receiver lifting cams, an access door
opener, a duckbill, and two cartridge support posts. Duririg
normal operation, the plastic cartridge is located only by
the duckbill and support posts. The cartridge receiver
merely
guides the cartridge into position to be picked up by
the duckbill and support posts, allowing therecording disk
to rotate freely on the spindle. The rotating spindle drives
the disk by magnetic coupling at the disk hub.
As the drive front door is opened, the lifting cams rotate to
elevate the receiver to a slanted position and the magnetic
coupling at the disk hub is released. When the disk cartridge
is inserted into the receiver (Figure 1-5b), the access door
opener contacts the rear of the top cover, opening the
access d60r to allow entry of the read/write heads.
1.5.5 Logic Assembly
The logic assembly (Figure 1-I), located in the right rear
portion of the disk drive, holds eight printed circuit cards.
Three of these cards contain the system logic and the
readlwrite circuits. Two cards contain the positioner servo
logic. One card is the cable connector that interfaces the
electronics with the positioner and other chassis-mounted
components, while the remaining two cards contain the
interface cables and terminators.
1.5.6 Air System
The
air system (Figure 1-6) consists of the prefilter, blower,
absolute filter, plenum chamber, and the cartridge air duct.
As the blower rotates, unfiltered
air is drawn through the
prefilter, where it is purged of large dust particles. The
prefiltered
air is then circulated through the logic assembly
and into the plenum. From there, the air passesthrough the
absolute filter (where minute contamination is removed),
up the cartridge
air duct, and into the disk cartridge.
Cooling
air from the absolute filter is also shunted, by the
plenum, through the
linear positioner. Exhaust air exits
through the front
grill of the drive.
1.5.7 Power Supply
The power supply (Figure 1-I), located in the left rear
portion of the disk drive, furnishes
all the dc voltages for
the drive. The power supply can operate with a 11
5 V or
230
V, 50 or 60 Hz line voltage input (Paragraph 4.6).
1.5.8 ReadIWrite Heads
There are two ramp-loaded readlwrite heads in the RK05
Disk Drive. One head functions on the top surface of the
recording disk and the other on the bottom. The heads are
mounted on suspension arms that rest, when the heads are
unloaded, on a plastic cam block of the duckbill (Figure
1-71. Flat cantilever springs uunneci; the suspension arms to
the head-support tailpieces. When the drive is placed in the
RUN mode, the positioner moves the heads forward toward
cylinder zero. When the entire head slider pad has passed
the edge of the disk, a ramp on the suspension arm slides
down the edge of the plastic cam block, thereby moving
(loading) the heads close to the disk surface. When loaded,
the heads "fly" 80 to 100 microinches from the disk
surface (Figure 1-8). A film of air (air bearing) between the
disk and the head acts as
a force away from the disk, while
the cantilever spring is a counterbalancing force toward the
disk. Thus, as long as the disk rotation remains constant the
heads remain at a relatively constant distance away from
the disk surface.

Table 1-2
Controls and Indicators
Controls and Indicators
RUNILOAD
(rocker switch)
WT PROT
(rocker switch
-
spring-loaded off)
PWR
(indicator)
RDY
(indicator)
ON CYL
(indicator)
Description
Placing this switch in the RUN position (providing that all interlocks are safe):
a. locks the drive front door
b. accelerates the disk to operating speed
c. loads the readlwrite heads
d. lights the RDY indicator.
Placing this switch in the LOAD position
:
a. unloads the readlwrite heads
b. stopsthe disk rotation
c. unlocks the drive front door when the disk has stopped
d. lights the LOAD indicator.
CAUTION
Do not switch to the LOAD position during
a write
operation; this results in erroneous data being recorded.
Placing this momentary contact switch in the WT PROT posistion lights the WT
PROT indicator and prevents a write operation; it also turns off the FAULT
indicator, if that is lit.
Depressing this switch in the WT PROT position a second time turns off the WT
PROT indicator and allows a write operation.
Lights when operating power is present. Goes off when operating power is removed.
Lights when
:
a. the disk is rotating at the correct operating speed.
b. the heads are loaded.
c. no other conditions are present (all interlocks safe) to prevent a seek,
read, or write operation.
Goes off when the RUNILOAD switch is set to LOAD.
Lights when:
a. the drive is in the Ready condition.
b. a seek or restore operation is not being perform
c. the readlwrite heads are positioned and settled.
Goes off during a seek or restore operation.

Table 1-2 (Cont)
Controls and Indicators
Controls and Indicators
FAULT
(indicator)
WT PROT
(indicator)
LOAD
(indicator)
WT
(indicator)
RD
(indicator)
Description
--
Lights when:
a. erase or write current is present without a WRITE GATE.
b. the linear positioner transducer lamp is inoperative.
Goes off when the WT PROT switch is pressed, or when the drive is recycled
through a RUNJLOAD sequence.
Lights when:
a. the WT PROT switch is pressed.
b. the operating system sends a Write Protect command.
Goes off when the
WT PROT switch is pressed a second time, or when the drive is
recycled through a RUNJLOADsequence.
Lights when the readjwrite heads are fully retracted and the spindle has stopped
rotating.
Lights when a write operation occurs. Goes off when the write operation
terminates.
Lights when
a read operation occurs. Goes off when the read operation terminates.
Figure
1 -2 Controls and Indicators

TENSION SPRING DRIVE BELT SPINDLE PULLEY
\
DRIVE MOTOR
Figure 1-3 Spindle and Drive System
TRACK POSITION LINEAR TRANSDUCER READMRITE
SCALE (UNDER CARRIAGE) CARRIAGE SLIDE HEADS
MOTOR HOUSING ARMATURE
(PERMANENTMAGNET INSIDE) CARRIAGE DUCKBILL
68584
Figure 1-4 Linear Positioner

LIFTING
CAMS
DRIVE FRONT DOOR
SPINDLE
MOTOR
SPINDLE
\
ACCESS
\
CARTKIDSÂ
DOOR OPENER AIR DUCT
a. Cartridge Removed
b. Cartridge Inserted
Figure
1-5 Cartridge Handling System

Figure 1-6 Air System
HEAD BRACKET
DOWN (UPPER) HEAD
AIR BEARING
AIR BEARING
UP (LOWER) HEAD
Figure 1-7 Head Loading

HUMAN HAIR
.004 DIA
Figure 1-8 Relationship of Disk Head, Disk, and Contaminants
The DOWN
(UPPER) HEAD is so-called by convention coil, the induced flux magnetizes the surface of the disk
throughout the computer industry because it faces down; passing under the gap. During a write operation, when the
the
UP (LOWER) HEAD faces up. These designations were current direction in the coil is reversed, a flux reversal is
created to describe heads loaded onto a multisurface (1
0 or recorded on the disk. During a read operation, the
20) cartridge. previously-recorded flux pattern on the disk induces
current
in the head. Any flux reversal on the recording
The recording device (re&/write head) is 3 cc~-w~'~~~ surface
ferrite core with an air gap. As current flows through the

2.1 UNPACKING AND INSPECTION
The RK05 Disk Drive can be shipped in a rack as an integral
part of a system or in a separate container. If the drive is
shipped in a rack, the rack should be positioned in the final
installation location and unpacked as follows:
1.
Remove the shipping brackets from the drive
by removing the snap-on bezel beneath the
lowest drive.
2. Remove the screws attaching the shipping
bracket and latch molding to both sides of the
drive.
CAUTION
Do not use the drive front door handle to
pull the drive out from the rack.
3. Slide the drive out about 3 inches from the rack
and pull the shipping brackets out from the
sides of the drive. Attach the latch molding
back onto the drive with the shipping bracket
screws.
4.
Slide the lowest drive out far enough to gain
access to the shipping brackets on the drive
directly above it and remove the screws from
these two shipping brackets.
5. Repeat Steps
3 and 4 for each drive in the rack.
6.
Remove the drive bottom cover and remove the
screws that attach the three internal shipping
brackets to the baseplate (Figure 2-la).
CAUTION
Do not operate drive with shipping
brackets attached.
CHAPTER 2
INSTALLATION
7.
If KG5 drives are "daisy-chained" with RK03
drives in a multidrive installation, arrange the
RK05s consecutively at the controller end of
the bus to avoid interruption of the AC LOW
and DC LOW interface lines, which are not
carried by the RK03s. If this arrangement is not
possible, all RK05s that are separated on the
bus by RK03s must be connected by separate
cables between their J06 connections (Figure
2-2).
8.
Remove the drive top cover and remove the
mounting screw and shipping strap from the
linear positioner (Figure 2-lb). Turn the
shipping strap upward and replace it on the
linear positioner, making sure it
is tightly
secured.
9. Retain all packing material for possible
reshipment. Inspect the drive for possible
damage. Report any damage to the carrier and
to Digital Equipment Corporation.
10. In the case of RK05 Disk Drive relocation or
reshipment, replace the shipping brackets and
shipping strap in the shipping position; repeat
this unpacking and inspection procedure when
the drive is reinstalled.
If the drive
is shipped in a separate container, use care while
unpacking it. Do not drop the drive or subject it to
unreasonable impact.

SHIPPING BRACKET
SHIPPING BRACKETS
a. Shipping Brackets
SHIPPING MOUNTING
STRAP SCREW
P2
BRACKET
SCREW
LINEAR
POSITIONER
b. Shipping Strap
Figure
2-1 Shipping Bracket and Shipping Strap Locations
2-2

PREFILTER Â
INTERFACE CABLE
Figure 2-2 RK11C or RK 1 1 D Interface Cable Installation
2-2 MECHANICAL INSTALLATION AND CHECKOUT
If the RK05 Disk Drive is to be installed in an existing rack,
the chassis slides should first be installed in the rack (Figure
2-3). The disk drive should be mounted on the chassis slides
as follows: (If necessary, refer to the RK05 Option
Configuration Dwg. No. D-OC-RK05-0-15 for detailed
mechanical specifications of a multidrive installation.)
3. Slide the drive onto the chassis slides until it
locks.
4.
Remove the drive bottom cover and remove the
screws that attach the three internal shipping
brackets to the baseplate (Figure 2-la).
1. Install cabinet stabilizers before mounting the
drive, unless the weight of the rack is sufficient
to prevent tipping when the drive is fully
extended.
2. Pull the chassis slides out until they lock in the
extended position.
Remove the drive top cover and remove the
mounting screw and shipping strap from the
linear positioner (Figure 2-lb). Turn the
shipping strap upward and replace it on the
linear positioner. Pull the heads forward as far
as possible without going off the ramp (Figure
1-7) and confirm that the batteries (Figure 1-1)
return the heads tothe home position.