Digital Equipment RK07 User manual

R K06/R K07 Disk Drive
Service Manual
EK-RK067-SV-001
digital equipment corporation • maynard, massachusetts

Copyright cD 1978 by Digital Equipment Corporation
The material in this manual is for informational purposes and
is subject
to change without notice.
Digital Equipment Corporation assumes no responsibility for
any errors
which may appear in this manual.
Printed in U.S.A.
This document was set on DIGITAL's DECset-8000 com-
puterized typesetting system.
The following are trademarks of Digital Equipment Corporation.
Maynard. Massachusetts:
DIGITAL DECsystem-10
MASSBUS
DEC
DECSYSTEM-20 OMNIBUS
PDP DIBOL
OS/8
DECUS EDUSYSTEM
RSTS
UNIBUS VAX RSX
VMS
lAS
1st Editon, January 1979
6/82-15

PREFACE
The RK06/ RK07 Disk Drive Service Manual is intended as an aid for maintaining an RK06 or RK07
disk drive. Chapter 1 describes the maintenance philosophy and lists the necessary tools and available
diagnostics.
It also includes a description of the RK06/07 Field Test Box and several different views of
the drive. Preventive maintenance procedures are also outlined here. Chapter 2 contains the removal
and replacement procedures for all the drive field replaceable units (FRUs). Chapter 3 details the
procedures for performing any necessary checks, adjustments,
or alignments that may be necessary on
an
RK06 or an RK07. The appendices contain information on the User Defined Test (UDT) diagnos-
tic
and its use with the Bad Sector File, the procedure for hand-toggling in the bootstrap procedure,
and the installation
and field acceptance procedures for the drive.
There
is a list of supplemental documentation relative to the RK06 or RK07 drive in Chapter 1.
111

CHAPTER 1
1.1
1.2
1.3
1.4
1.5
1.5.1
1.5.2
1.5.3
1.5.4
1.6
1.7
1. 7.1
1.7.2
1.7.3
1.7.4
1.7.5
1.7.6
1.7.7
1.8
1.8.1
1.8.2
1.9
CHAPTER 2
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
CONTENTS
Page
MAINTAINABILITY
MAINTENANCE PHILOSOPHy ...................................................................... 1-1
RELATED DOCUMENTATION ...................................................................... 1-1
TOOLS AND EQUIPMENT .............................................................................. 1-1
DIAGNOSTICTESTING ................................................................................... 1-2
RK06/RK07 FIELD TEST BOX......................................................................... 1-3
General ........................................................................................................ 1-3
Basic ............................................................................................................ 1-3
Switch Description ....................................................................................... 1-3
Sample Switch Exercises ............................................................................... 1-8
DRIVE ORIENTATION .................................................................................... 1-9
OPERATOR CONTROLS AND INDICATORS ............................................... 1-9
RUN/STOP Switch ..................................................................................... 1-9
UNIT SELECT Switch...............................................................................1-18
FAULT Indicator ....................................................................................... 1-18
WRITE PROTECT Switch.........................................................................1-19
Access
"A" Enable Switch ..........................................................................1-19
Access
"B" Enable Switch ..........................................................................1-19
Dual Access Option ....................................................................................1-19
MAINTENANCE CONTROL AND INDICATORS .......................................1-19
SERVO RELEASE Switch (SWl) ..............................................................1-19
SERVO SAFETY Switch (SW2).................................................................1-19
PREVENTIVE MAINTENANCE ....................................................................1-19
SUBSYSTEM REMOVAL AND REPLACEMENT
INTRODUCTION .............................................................................................. 2-1
FRONT BEZEL AREA ....................................................................................... 2-1
Front Bezel................................................................................................... 2-1
Control Panel Assembly ...............................................................................2-6
Latch Assembly............................................................................................2-6
Blower Assembly ........................................................................................
2-1 0
Capacitor, Spindle Motor and Transformer ................................................ 2-11
Speed Sensor Assembly............................................................................... 2-11
Spindle Ground Spring...............................................................................2-13
FRONT BEZEL AND REAR COVER AREA ..................................................2-14
Front Bezel.................................................................................................2-15
Rear Cover.................................................................................................2-15
Absolute Filter ...........................................................................................2-15
Power Harness Assembly............................................................................2-16
Blower Assembly ........................................................................................
2-20
Speed Sensor Assembly...............................................................................2-20
Spindle Assembly .......................................................................................
2-21
v

2.3.8
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.4.9
2.4.10
2.4.11
2.4.12
2.4.13
2.4.14
2.4.15
2.5
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
2.5.6
2.5.7
2.5.8
2.5.9
2.5.10
2.5.11
2.5.12
2.5.13
2.5.14
2.5.15
2.5.16
2.5.17
2.5.18
2.5.19
2.5.20
2.5.21
2.5.22
2.6
2.6.1
2.6.2
2.6.3
CONTENTS (Coot)
Page
Spindle Drive Belt.......................................................................................2-23
REAR C()VER AREA ......................................................................................2-24
Rear Cover .................................................................................................2-26
Battery Pack Assembly ...............................................................................2-26
Servo
Pre-Amp Board .................................................................................2-28
Circuit Breaker Assembly ...........................................................................2-29
Power Supply Assembly..............................................................................2-34
Spin(lle
Brake Assembly .............................................................................2-38
Read/Write Heads ..................................................................................... 2-41
Servo Head .................................................................................................2-42
Read/Write Board ......................................................................................2-46
Home Lock Solenoid Assembly .................................................................'.2-46
Tachometer Magnet Assembly....................................................................2-50
Flexstrip Assembly ..................................................................................... 2-51
Glass Shutter Assembly ..............................................................................2-54
Velocity
Transducer Assembly, Two Dowel Version ...................................2-58
Magnet Housing Assembly.........................................................................2-65
LID ASSI~MBL Y AREA ...................................................................................2-68
Front Bezel.................................................................................................2-68
Rear Cover .................................................................................................2-68
Lid Assembly..............................................................................................
2-70
Pack-In-Place Switch ..................................................................................2-70
Motor and Bracket Assembly .....................................................................2-72
Shrolld Assembly........................................................................................2-74
Brush
Arm ..................................................................................................2-76
Brush Switch ..............................................................................................2-76
Brush
and Motor Assembly ........................................................................2-78
Brush
Motor ...............................................................................................2-79
Fixed
Way ..................................................................................................2-80
Read/Write Heads .....................................................................................2-80
Servo Head .................................................................................................2-82
Cam Guide .................................................................................................2-83
Universal Bracket Assembly .......................................................................2-84
Cam Tower Assembly.................................................................................2-86
Spring
Way Assembly.................................................................................2-86
Circuit Breaker Assembly ...........................................................................2-87
Magnet Housing Assembly.........................................................................2-88
Tachometer Magnet Assembly....................................................................2-89
Carriage and Coil Assembly........................................................................2-90
Guide Rod ..................................................................................................2-98
BASEPLATE ASSEMBLY AREA ..................................................................2-100
Front Bezel ............................................................................................... 2-1 00
Rear Cover ............................................................................................... 2-1 02
Lid Assembly............................................................................................2-102
VI

2.6.4
2.6.5
2.6.6
2.6.7
2.6.8
2.6.9
CHAPTER 3
3.1
3.2
3.3
3.4
3.4.1
3.4.2
3.5
3.6
3.7
3.8
3.9
3.10
3.1 ]
3.12
3.13
3.14
CONTENTS (Cont)
Page
Shroud Assembly...................................................................................... 2-1 03
Blower Assembly ...................................................................................... 2-1 04
Circuit Breaker Assembly ......................................................................... 2-1 04
Baseplate Assembly .................................................................................. 2-1 06
Magnet Housing Assembly .......................................................................2-109
Power
Transformer ................................................................................... 2-11 0
ADJUSTMENT PROCEDURES
LATCH ASSEMBLY ADJUSTMENT ............................................................... 3-1
SPEED SENSOR ASSEMBLY ADJUSTMENTS ..............................................3-3
BELT
TENSION ADJUSTMENT ......................................................................3-4
HEAD ALIGNMENT CHECKS AND CARTRIDGE CARE ...........................3-8
Head Alignment Using Program Control......................................................3-5
Head Alignment Using the Field Test Box .................................................. 3-11
HOME LOCK SOLENOID ASSEMBLY ADJUSTMENTS ............................3-15
TACHOMETER MAGNET ASSEMBLY ADJUSTMENTS ...........................3-16
GLASS SHUTTER ASSEMBLY ALIGNMENT ..............................................3-19
TRANSDUCER HOUSING ALIGNMENT .................................................... 3-21
TRANSDUCER PRE-AMP ADJUSTMENTS .................................................3-22
VELOCITY ADJUSTMENT ............................................................................3-24
PACK-IN PLACE SWITCH ADJUSTMENT ..................................................3-25
CARRIAGE ROLL ALIGNMENT ..................................................................3-27
POWER SUPPLY ±5 VOLTS........................................................................... 3-31
VCO ADJUSTMENT ........................................................................................3-33
APPENDIX A BAD SECTOR FILE
APPENDIX B TOGGLE BOOTSTRAP
APPENDIX C SUBSYSTEM INSTALLATION AND CHECKOUT
C.1
C.Ll
C.1.2
C.2
C.2.1
C.2
.. 2
C.2.3
C.2A
C.2.5
C.2.6
C.2.7
C.3
SITE CONSIDERATIONS AND PREPARATIONS ........................................ C-l
Environmental Considerations .................................................................... C-l
Site Preparation ...........................................................................................C-5
INSTALLATION ...............................................................................................C-5
Unpacking
and Inspection ...........................................................................C-6
Safety Precautions .....................................................................................
C-l 0
Installation Procedures .............................................................................. C-l1
Installation Checks and Adjustments .........................................................C-19
Power Conversion......................................................................................C-27
Dual Access Drive Installation...................................................................C-27
Dual Access Acceptance Procedure............................................................C-28
FIELD ACCEPTANCE TEST PROCEDURE .................................................C-28
Vll

C.3.l
C.3.2
CONTENTS (Cont)
Page
Error Definitions/Rates .............................................................................C-28
Diagnostic Testing.....................................................................................C-32
APPENDIX D TRANSDlJCER HOUSING ASSEMBLY SINGLE DOWEL VERSION
Figure No.
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
1-10
1-1 1
1-12
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-15
2-16
FIGURES
Title
Page
Field Test Box ......................................................................................................1-4
RK06/RK07 Drive Front View ..........................................................................1-10
RK06= RK07 Drive Rear View (Early Model) .................................................... 1-11
RK06/RK07 Drive Rear View (Late Model) ......................................................1-12
Card Nest (Early Model) ....................................................................................1-13
Card Nest (Late Model) ......................................................................................1-14
Read/Write Board Area .....................................................................................1-15
Velocity Transducer Assembly............................................................................1-16
Chassis Assembly ...............................................................................................1-17
Operator C:ontrol Panel......................................................................................1-18
RK06 Maintenance Controls and Indicators .......................................................1-20
RK07 Maintenance Controls and Indicators ....................................................... 1-21
Removal and Replacement Procedures Block Diagram ........................................2-2
Front Bezel Area Removal Replacement Procedures Block Diagram ....................2-4
Bezel Lid
and Cover .............................................................................................2-5
Chassis Assembly
(Front) .....................................................................................2-7
Base Plate Assembly..............................................................................................2-8
Latch Assembly....................................................................................................2-9
Speed Sensor Adjustment ...................................................................................2-12
Spindle Ground Spring.......................................................................................2-13
Front Bezel and Rear Cover Area Removal and Replacement
Procedures Block Diagram .................................................................................2-14
Chassis Assembly ...............................................................................................2-17
Power Supply .....................................................................................................2-19
Spindle Drive .....................................................................................................2-22
Rear Cover Area Removal and Replacement Procedures
Block Diagram ...................................................................................................2-25
Chassis Assembly
(Rear) ................. "." ..............................................................2-27
Servo Pre-;\mp Assembly ...................................................................................2-28
Circuit Breaker Assembly ...................................................................................2-30
Vlll

Figure No.
2-17
2-18
2-19
2-20
2-21
2-22
2-23
2-24
2-25
2-26
2-27
2-28
2-29
2-30
2-31
2-32
2-33
2-34
2-35
2-36
2-37
2-38
2-39
2-40
2-41
2-42
2-43
2-44
2-45
2-46
2-47
2-48
2-49
2-50
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
FIGURES (Cont)
Title Page
Spindle Break Assembly .....................................................................................2-39
Read/Write Head Connectors ............................................................................ 2-41
Insertion Tool Position Up Data Heads ..............................................................2-43
Insertion
Tool Position Down Data Heads ., .......................................................2-43
Servo
Head Position...........................................................................................2-44
Insertion
Tool Position Servo (Down) Head .......................................................2-45
Read/Write Board Area .....................................................................................2-47
Homelock Assembly...........................................................................................2-48
Head Separator Tool ..........................................................................................2-49
Tachometer Magnet Assembly ...........................................................................2-52
Flexstrip Assembly.............................................................................................2-53
Glass
Shutter Assembly......................................................................................2-54
Glass
Shutter Alignment Fixtures.......................................................................2-56
Transducer Block Alignment..............................................................................2-58
Velocity
Transducer Assembly............................................................................2-59
Transducer Pre-Amp Adjustments ......................................................................2-60
RK06 Maintenance Controls and Indicators....................................................... 2-61
RK07 Maintenance Controls and Indicators.......................................................2-62
RK06/RK07 Field Test Box...............................................................................2-66
magnet Housing Assembly.................................................................................2-67
Lid Assembly
Area Removal and Replacement Procedures Block Diagram ........2-69
Pack-In Place Switch .......................................................................................... 2-71
Motor and Bracket Assembly .............................................................................2-72
Shroud Assembly ...............................................................................................2-75
Brush
and Motor Assembly................................................................................2-77
Spring Plate Assembly........................................................................................
2-81
Velocity Tranducer Pre-Amp Board ...................................................................2-85
Carriage and Coil Assembly ............................................................................... 2-91
Tee Bar Assembly...............................................................................................2-93
Carriage Alignment Fixture ................................................................................2-94
Indicator Comparator Gauge .............................................................................2-95
Eccentric Bearing
Adjustment ............................................................................2-99
Guide Rod ........................................................................................................ 2-1 00
Baseplate Assembly Area Removal and Replacement
Procedures Block Diagram ............................................................................... 2-1 01
Latch Assembly....................................................................................................3-2
Speed Sensor
Adjustment .....................................................................................3-3
Spring Plunger
Adjustment ..................................................................................3-4
RK06 Maintenance Controls and Indicators ........................................................3-6
RK07 Maintenance Controls and Indicators ........................................................3-7
Servo
Head and Board Area .................................................................................3-9
Head Alignment Tool ...:.....................................................................................3-10
Servo Head and Board Area ...............................................................................3-12
RK06/RK07 Field Test Box...............................................................................3-13
IX

Figure No.
3-10
3-11
3-12
3-13
3-14
3-15
3-16
3-17
3-18
3-19
3-20
3-21
3-22
3-23
3-24
A-I
A-2
C-l
C-2
C-3
C-4
C-5
C-6
C-7
C-8
C-9
C-IO
C-l1
C-12
C-13
C-14
C-15
D-l
Table No.
I-I
FIGURES (Coot)
Title Page
Homelock Assembly...........................................................................................3-15
Head Seoarator Tool ..........................................................................................3-16
Tachometer Magnet Assembly ...........................................................................3-17
Glass
Shutter Assembly......................................................................................3-18
Glass
Shutter Alignment Fixtures.......................................................................3-20
Transdu,,:;er Pre-Amp
Adjustment .......................................................................3-22
Pack-In Place Switch ..........................................................................................3-25
Brush and
Motor Assembly................................................................................3-26
Tee Bar
,\ssembly ...............................................................................................3-28
Carriage Alignment Fixture ................................................................................3-28
Indicator Comparator Guide ..............................................................................3-29
Eccentric Bearing
Adjustment ............................................................................3-30
Insertior. Tool Position Up Data Heads ..............................................................3-32
Insertion
Tool Position Down Data Heads ..................................................".....3-32
Power Supply Adjustment ............................................................................0 ••••• 3-33
Bad Sector File
Format .......................................................................................A-I
Bad Sector Address
Format ................................................................................. A-l
Relationship of Disk Head, Disk, and Contaminants ...........................................C-3
RK06/RK07 Disk Drive Air Supply Distribution Subsystem ..............................C-4
RK06/RK07 Shipping Package Configuration ....................................................C-7
RK06 Disk Drive Logic Module Locations..........................................................C-8
RK07 Disk Drive Logic Module Locations..........................................................C-9
RK611
Controller Backplane.............................................................................C-12
RK611 I/O Connector Details...........................................................................C-13
Serial Tag Location and Model Identifications...................................................C-14
RK06/RK07 I/O Connector Details .................................................................C-15
Dual-Access Disk Subsystem H969 Cabinet. ......................................................C-16
Dual-Access Disk Subsystem H969 Cabinet. ......................................................C-17
RK06 Head Assembly Area ..........................................................................o .... C-22
RK07 Head Assembly Area ...............................................................................C-23
RK611/RK06 or RK611/RK07 Dual Access Cable Diagram ............................C-29
RK611/RK06 or RK611/RK07 Cable Diagram for Testing Dual Access ..........C-30
Transducer Block Alignment............................................................................... D-l
TABLES
Title Page
Diagnostic Programs Used In RK611 /RK06 and RK611 /RK07 Disk Subsystem
Field Acceptance Tests.........................................................................................
1-2
x

Table No.
C-l
C-2
C-3
C-4
C-5
C-6
C-7
TABLES (Coot)
Title Page
Special Tools and Test Equipment for RK611/RK06 or RK611/RK07 Disk
Subsystem Installation.........................................................................................C-6
RK611
Control Switch Configurations for Desired Unibus
Address and Interrupt Vector ............................................................................ C-ll
Drive Bus Cables ...............................................................................................C-15
Sample Talk for Backplane Wiring ....................................................................C-18
Unit-Select Plugs for
RK06/RK07 Disk Drives .................................................C-19
RK611/RK06 and RK611/RK07 Disk Subsystem Diagnostic Errors................C-30
Diagnostic Programs Used in RK611/RK06 and RK611/RK07
Disk Subsystem Field Acceptance Tests.............................................................C-34
Xl

1.1 MAINTENANCE PHILOSOPHY
CHAPTER 1
MAINTAINABILITY
The RK06/RK07 Disk Drive maintenance philosophy consists essentially of taking full advantage of
the software and hardware tools available to troubleshoot down to the defective field replaceable unit
(FRU). Replacement of the defective FRU is the primary maintenance strategy whenever possible.
Should this become impractical, sufficient diagnostics
and maintenance aids will be provided to con-
tinue troubleshooting to the
component level.
1.2
RELATED DOCUMENTATION
The documents listed below contain information necessary for a complete understanding of the func-
tion, installation, operation, programming,
and maintenance of the RK611 Controller and the RK06
and RK07 Disk Drives Information on the PDP-II processors and Unibus is provided in the PDP-}}
Peripherals Handbook.
Title
Number
RK06/RK07 Disk Drive User's Manual
RK06/RK07 Disk Drive Technical Description
RK06 IPB Manual
EK-RK067-UG-001
EK-RK067-TD-001
EK-RK06-IP-001
EK-RK611-TM-002
EK-RK67F-OP-001
EK - RK07 - IP-OO 1
RK611 Controller Technical Manual
RK06/07 FTB Operating and Service Manual
RK07 IPB Manual
1.3 TOOLS AND EQUIPMENT
Maintenance of the RK06 and RK07 Disk Drive units requires that Field Service personnel possess
the following special tools peculiar
to the maintenance of these drives.
Part No.
RK06/07-TA
RK06/07-TB
RK06K-AC
RK07K-AC
93-06058
93-06240
93-06076
93-06087
93-06122-01
93-06122-02
93-06123-01
93-06I23-02
93-06171
Part
Field Test Box (1 15 Vac; 50 or 60 Hz)
Field Test Box (230 Vac,
50 or 60 Hz)
RK06 Alignment Cartridge
RK07 Alignment Cartridge
Wrench
Glass Alignment
Tool (New)
Head Installation/Removal Tool
Head Alignment Tool
Shim 0.003 inch
Shim 0.00015 inch
Shim 0.020 inch
Shim 0.015 inch
Head Separation Tool
I-I

Part No.
93-06154
29-19633
29-20065
29-20906
29-21487
29-21832
29-22526
93-06056
Part
Pulley Plunger Gauge
Mirror
Magnifier
Torque Wrench
Head
Torque Wrench
Hex Ball Driver Set
Screwdriver, 14.5-inch Phillips
Carriage Roll Alignment Tool
1.4 DIAGNOSTIC
TESTING
The diagnostic tests that are used during installation of the RK06 or RK07 Disk Subsystem may be
used anytime to demonstrate system performance or to help pinpoint problem areas. Table
1-1 lists the
diagnostics available and Appendix C
(Paragraph 3.2) provides a brief summary of the function that
each performs.
Table
1-1 Diagnostic Programs Used in RK611/RK06 and RK611/RK07 Disk Subsystem Field Ac-
ceptance Tests
MAINDEC-II-DZR6A
MAINDEC-II-DZR6B
MAINDEC-II-DZR6C
MAINDEC-II-DZR6D
MAINDEC-II-DZR6E
MAINDEC-II-DZR6G
MAINDEC-II-DZR6H
MAINDEC-II-DZR61
MAINDEC-II-DZR6J
MAINDEC-II-DZR6K
MAINDEC-II-DZR6L
MAINDEC-II-DZR6M
MAINDEC-l1-DZR6N
MAINDEC-II-DZR6P
MAINDEC-II-DZR6Q
MAINDEC-II-DZR6R
RK611 Diskless Controller Diagnostic, Part I (no drive required)
RK611 Diskless Controller Diagnostic,
Part II (no drive required)
RK611 Diskless Controller Dignostic,
Part III (no drive required)
RK611 Diskless Controller Diagnostic,
Part IV (no drive required)
RK611 Diskless Controller Diagnostic,
Part V (no drive required)
Unibus RK06-RK07
Dual Port Drive Diagnostic
Unibus RK06-RK07 Drive Diagnostic,
Part I
Unibus RK06-RK07 Drive Diagnostic,
Part II
Unibus RK06-RK07 Drive Diagnostic,
Part III
RK611 Functional Controller Diagnostic
RK06K-RK07K Cartridge Formatter
RK611/RK06 -RK611 /RK07 Subsystem Verification, Part I
RK611/RK06 - RK611/RK07 Subsystem Verification, Part II
RK611/RK06-RK611/RK07 Performance Exerciser
RK06 -RK07 Drive Compatibility
RK611/RK06 - RK611/RK07 User Defined Test
1-2

1.5 RK06/07 FIELD TEST BOX
1.5.1 General
The RK06/07 Field Test Box (RK06/07-TA, TB) is a self-contained, system independent, suitcase
tester capable
of complete RK06 or RK07 operation directly through the drive's interface hardware
and is necessary to perform RK06 or RK07 head alignment. The section of the tester used in head
alignn1ent
is functionally independent from the section of the tester that communicates with a drive
through the interface (interface section). Therefore, head alignment may be performed with the drive
interface
under either diagnostic control or under control of the interface section of the tester.
To fully utilize the capabilities of the interface section of the tester, a knowledge of the drive interface is
mandatory. The tester panel is designed to be a visual reminder of the interface to anyone who has read
the interface specification and should become self-explanatory after a
short period of use (Figure 1-1).
1.5.2 Basic Loop Operation
A basic loop operation is defined, for an RK06 drive, by putting all applicable front panel switches in
their underlined position, and, for an RK07, by putting the cylinder address switches to their dotted
positions and the remaining applicable switches in their underlined positions. Operation in this mode
puts an RK06 or an RK07 through the most complex exercises the tester is capable of generating.
Since much
of the usefulness of the tester lies in the flexibility with which the basic loop may be
modified, the basic loop description will be followed by a front panel switch description defining each
switch's function
and detailing how each switch modifies the basic loop operation.
The operation of the interface section of the tester centers around a repetitive loop in which the tester
sends
the drive a message, receives messages AO and BO from the drive, checks for a Drive-to Con-
troller parity
error or a Drive Fault, and then a Drive Ready. These steps happen repetitively until a
message from the drive indicates
that the command has been executed, signified by the assertion of
Drive Ready. This assertion is delayed by the tester (the time is variable by the operator) and then the
write: process starts.
As a sector comes
under the selected head, the tester starts writing at a high frequency (232.5 ns/flux
reversal)
on all even-numbered sectors, and at a low frequency (465 ns/flux reversal) on all odd-
numbered sectors (in either format).
Data is always written from the end of one sector pulse to the
middle of the next sector pulse. The high frequency is the same frequency as an all 0 or all 1 data
pattern. The low frequency is the same as the frequency of the data pattern 1010101010. Writing and
reading are automatically inhibited on cylinder 410 (on an RK06K cartridge) or on cylinder 815 (on an
RK07K cartridge) to avoid destruction of important bad track information prerecorded on each pack.
Reading starts next on sector 0
and continues for a whole revolution (in either format). Any data error
is stored and halts operation after the whole revolution is completed. (Again, cylinder 410 (RK06) or
815 (RK07) to preserve bad track information.) If no errors are found, the tester increments its address
(head first, then cylinder)
and sends out its new address starting the whole cycle over again.
In
"basic loop" operating mode, cylinders are addressed in an alternating (ALT) mode. This means
that the cylinder address sent out by the tester alternates between the address in the switch register
(SWR) and the address in an incrementing register in the tester.
For example, if the SWR content is 5,
the order of the cylinders addressed would be 5, 0, 5, 1, 5, 2, 5, 3, ... 5, 410, 5, 0, 5, 1, ... etc.
1.5.3 Switch Description
The following switch descriptions detail the function of each front panel control and describe how the
"basic loop" operation can be varied by the operator. Where applicable, potential uses for these
deviations from
"basic loop" operation will be mentioned.
1-3

~
RK07
@ DRIVE
TYPE
-COMMANDTORKO&7-
~ DESELECT
\~ RELEASE
-LOOP CONTROL -
SINGLE © CONTINUOUS
CYCLE CD~~:. ~
RK06
+
EXERCISE
@
STATUS
CYLINDER
DRIVE
SELECT
--+ ml
POLLED
ATTENTION SACK
o o
MULTIPLE DRIVE
SELECT
(®
o
ADDRESSING
~
mUENTIAL
OSC (SWR H 0)
ALT (SWR H SEQUENTIAL)
----,
c@1 SEEK
{~ RECALIBRATE
@ START SPINDLE
@ RTC
~ CLEAR ERROR &
\~ ATTENTION
20 ~ 22 SECTORS
~ ;~;~~~IUM
,~ SETVOLUME
~ VALID
HEAD
ALL
,SECTOR
ALL
@
SWR SWR
ZERO
ONLY
512 256 128 64 32 16 8 4 2 1 2 1
<6>@~ ~~~ ~ ~ ~ (ij)~@@
29 28 21 28 25 24 23 22 21 20 21 20
. .. .. ... --
-RK06
• RK07 ALIGNMENT TRACK
MESSAGE
MESSAGE A
SELECT
1 2
T15
r14 T13 T12 T11 T10
T9 T8 T7 T6 T5
T4
!~~!
0 0 0 0 0 0 0 0 0 0 0 0
T15
114
T13
T12 T11 T10
T9 T8 T7 T6
T5 T4
0 0 0 0 0 0 0 0 0 0 0 0
MESSAGE B
mDmDOmO
INIT
CONTROLLER~
<®
rk06/07 field tester
PWR OFF •
Figure 1-1 Field Test Box
1-4
FUNCTION ~
RK06
~
SEEKONLY
SEEK & WRT
SEEK & READ
SEEK &
W/R
SYNC
INT~~
CLOCK
SLOW ~ FAST
HALT ON ERROR
;~Y~
DRIVE DATA/D -> C PARITY
FAULT ERROR
o
X 10 = J.l.IN, METER
VALID
o
RK07
X 5 =/-lIN.
o
T3 T2
T1 TO
PARITY
0 0 0 0 EVEN
~ ODD
T3 T2 T1 TO
PARITY
0 0 0 0
EVEN@"2£9
MA-10B2

EXERCISE-STATUS.
In STATUS mode, the tester formulates a message requesting the message set in the MESSAGE
SELECT switch, transmits the message once, receives the requested message, displays it in the MES-
SAG E A and MESSAGE B LEDs, and halts.
Potential uses are, if the tester halts on a Drive Fault error, Status mode can be selected, and START
pushed to display anyone of four messages in the message LEDs to find the specific error condition
generating Drive
Fault.
DRIVE SELECT
The DRIVE SELECT switch is used to select the drive number to which messages will be sent. The
switch also determines what drive number will be sent on the 20, 21, and 22polled address interface
lines.
The POLLED ATTENTION LED indicates the condition of the POLLED ATTENTION interface
line.
If the drive whose address is in the DRIVE SELECT switch has attention set, the LED should be
on.
NOTE
The LED will appear to be on all of the time. In
reality, however, the 20 polled address line sent
out to
the drive is automatically inverted for a very short
amount
of time to properly toggle the drive logic and
facilitate scoping in the drive, i.e., although the
POLLED ATTENTION LED in the tester appears
fully on,
it is actually being run at a very high duty
cycle.
The SACK LED displays the condition of the select acknowledge line transmitted by the drive. It
should be on after the drive number set in the DRIVE SELECT switch is sent out to the drive, if, and
only if, the DRIVE SELECT button matches the number in the DRIVE SELECT switch and if the
DESELECT /RELEASE bit is negated.
The MULTIPLE DRIVE SELECT LED displays the state of the multiple drive select line transmitted
by the drive. The LED light should light when the MULTIPLE DRIVE SELECT button is pushed.
Pushing the button causes the tester to assert the index-sector line. The drive under test should detect
multiple drive select
and assert the mUltiple drive select line after sensing index and sector assertions
other than its own.
All switches in the
COMMAND TO RK06/07 block (top middle of panel) set the message bits that the
tester sends to
the drive in Message A, T3 (DESELECT/RELEASE) through TIl (SET VOLUME
VALID). These bits are exactly as described in the drive interface specification.
All switches in
the LOOP CONTROL block (upper right of panel) allow modification of the "basic
loop" mode of system operation.
If the top switch is removed from the Continuous mode and put into the Single Cycle mode, a com-
mand is formulated, messages are continuously transmitted and received until Drive Ready is asserted,
writing
and reading are done, errors are checked, and a new command is formulated in the tester but is
not stmt. In this Single Cycle mode, the new message is sent only when the start button is activated.
That is, repetitive operations must be manually initiated by repetitive activation of the ST ART switch.
1-5

Typical uses for the Single Cycle modification of "basic loop" operation are:
1. To write only one track of the disk and have the writing stop in an orderly manner at a track
boundary. Pushing STOP would stop writing instantly, potentially making an error in the
current sector.
2. If positioning problems were present causing the drive to shut itselfdown, it would be useful
to manually ini:iate seeks at a very low rate while scoping the problem.
The DELAY knob is a continuously adjustable time delay control that delays tester recognition of
Drive Ready from approximately 100 JlS to approximately 0.7 seconds. This offers a continuous ad-
justable time delay between completion of a Seek and initiation of a Write/Read.
Typical uses for the adjustable time delay could be:
1. If settling of the servo was taking longer than is proper, waiting before writing could make
data errors cease, thereby giving a clue to the problem source.
2. If a problem exists which causes the drive to cease operation for its own safety, a long time
between seeks would give
more time for scoping before the drive stopped itself.
3.
Any unwanted resonances could be excited by varying (tuning) the time between seeks.
The FUNCTION switch is self-explanatory. "Basic loop" operation involves positioning, writing, and
then reading. The modifications to the "basic loop" offered by this switch involve SEEK ONLY,
SEEK & WRITE, or SEEK & READ. The positions are useful when working on positioning prob-
lems not involving reading or writing, or when working on data problems to separate write problems
from read problems.
SYNC - In "basic loop" operating mode, the "system" clock source is Interface Write Clock, always
generated by the drive from its disk pack.
Write Clock is so imperative to proper read/write operation
of a drive, with either a ;,;ontroller or tester, that difficult to detect problems with Write Clock can
cause very random data errors. To help isolate this type of problem, the SYNC switch can be put in its
INT position. This causes the tester to use an internal oscillator as "system" clock and ignore Interface
Write Clock. In summary, if random data errors are occurring, and switching to SYNC INTernal
stops the errors, Write Clock should be suspected.
CLOCK - Main Clock on the interface clocks status and command information between the tester and
the drive. In Fast mode, Control Clock happens at standard subsystem speed ~465 ns/cycle); in SLO
mode, Control Clock happens at (465 X 64) ~29.8 Jls/cycle. Slow speed makes scoping much easier
and is useful in detecting speed problems.
The HALT ON ERROR switch is self-explanatory. The DRIVE FAULT LED is lit (in Exercise mode
only) whenever the Interface Drive Fault bit is asserted by the drive. Simply put, this LED indicates
errors detected by the drive. The other LED indicates any errors detected by the tester. These may be
of two types:
1. Data error. (If Function includes a Read).
2. A drive to tester -(D)rive -.(C)ontroller - parity error.
NOTE
. 1'0 aid in debugging intermittent problems, the error
LEDs will light when errors exist independent
of the
"etting of the HALT ON ERROR switch.
1-6

The Addressing block provides many addressing variations from the "basic loop" operation address-
ing scheme already described.
Successive Cylinder addresses may be:
1. SEQUENTIAL -0, 1,2, .. ,410,0, 1, ... (on an RK06)
0, 1,2, ... , 814,0, 1, .... (on an RK07), or
2. OSCillating - SWR, 0, SWR 1, ... SWR, 410, ... SWR, 0, ... , (on an RK06)
SWR, 0, S\VR, 2, ... SWR, 815, .. , SWR, 0, ... , (on an RK07), or
3. just SWR.
NOTE
In just SWR mode, successive messages call for the
same cylinder (contained in the switch register) and
allow repetitive writing and reading with
no physical
seeking.
Successive Head (track) addresses may be:
l. ALL -0, 1, 2, 0, 1, 2 .. "
2. SWR -Only the head address set in the switch register.
SECTOR
Sectors to be written and read may be ALL sectors (20 in 20-sector mode or 22 in 22-sector mode) or
sector ZERO ONLY LEDs under the cylinder and head switch registers always display the last cylin-
der
and head addresses sent to the drive.
The MESSAGE A and MESSAGE B PARITY switches (bottom right of panel) cause the tester to
transmit wrong EVEN parity to the drive independently on A and B to ensure the drive can detect
these errors independently.
The CONTROLLER POWER OFF button tells the drive through the interface line of similar name
that the controller (or tester) has lost power. It is used to verify that the drive will properly sense this
line in case a real power loss occurs
on the computer system. This interface line is also connected to +5
in the tester so the drive will behave properly if any true lack of tester power disables the interface.
The INIT button generates an assertion on the Initialize interface line.
The START and STOP switches start and stop the tester. Operation is not guaranteed if switches are
changed
without stopping the tester first. STOP clears the whole tester and all addressing, etc., will
start at an initialized state when START is released after being pushed. Should the tester halt on error,
status may be checked by selecting STATUS and repeatedly pushing START without pushing STOP
and the tester formulated message will not change. In Single Cycle mode, repetitive STARTs act like
continues
and will increment the tester while a STOP will initialize the tester.
1-7