Abekas A60 User manual

VideoSystems, Inc.
A Carhon Co mpany
Copyright January 1988
digital disk recorder A60
A60
Technical
Manual

AbekasA60 DIGITAL DISK RECORDER
Technical Manual
copyright January 1988
Abekas Video Systems, Inc.
101 Galveston Drive
Redwood City
California 94063
[phone]

A60 Technical Manual
TABLE OF CONTENTS
Table of Contents
SECTION 1: INTRODUCTION
INTRODUCTION ............................................. 1-1
Description .............................. " ......................... 1-1
Physical Description ............................................... 1-2
Related Publications
............................................... 1-2
SECTION 2: INSTALLATION
INSTALLATION .............................................. 2-1
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Physical Mounting ................................................. 2-1
System Interconnects .............................................. 2-1
Signal System to Disk Drive Connections ........................ 2-1
Control Panel to Signal System Connection ..................... 2-3
Control Panel
to Menu Monitor Connection .................... 2-3
Video Connections ......................................... 2-4
Detailed Pin-Out Information
........................................ 2-5
Keyboard Interconnections .................................. 2-5
The
SMPTE and AUX RS422 Connections ........................ 2-6
The
RS232 Connections ......................... I •••• I •• I •• I • 2-7
Editor
Interfacing . I ••• I ••••• I ••••••••••• I ••••• I •• I •••• I I • I I • 2-8
SMPTE Edltors/RS422 I •• I ••••••••••••••• I • I I •• I I • I .. I I • I ••••• I • 2-9
A53-D
Interfacing I I • I I •• I .". I ••••••••••• I ••••••••••••••• I • I •• 2-10
GPI Connections .................................................. 2-11
GPllnputs ................................................. 2- 11
GPI Outputs .................................. I •••••••••••• 2-13
Analog Output Configuration/Alignment ............................. 2-14
Introduction ............................................... 2-14
Determining The
I/O Board Version ............. I • I ••••••••••• 12-14
Y,R-Y,B-Y With Sync On V (-ol,02 Versions) ...................... 2-15
Y,R-Y,B-Y With No Sync (-01,02 Versions) .... I •••••• I •••••••••••• 2-17
R,G,B With Sync On Green (-01,02 Versions) ... I ••••• I ••• I I I I I I • 12-19
R,G,B With No Sync (-01,02 Versions) I I I II I I I I I I I I I • I I • I I I I I I I I .2-22
Preview
Alignment (-01,02 Versions) I. I ••••• I •• I I • I •••• I •• I I • I .2-25
Jumper Descriptions(-03,04Versions, no Piggyback) ............. 2-27
Output Level Adjustment (-03,04 Versions, no Piggyback) ..... I ••• 2-29
Jumper Descriptions (-04 Version With Piggyback, 525 only) .... I •• 2-31
Output Level Adjustment (-04 Version With Piggyback, 525 Only) .. 2-32
Preview
Alignment (-03,04 Versions, with or without Piggyback) .... 2-35
Power Procedures
................................................. 2-36
Powering UpThe System
.. I •••••••• I •• I ••••• I •• I •••• I •• I •• I • I 2-36
Power-Down
Procedure ........... I •• I • I •••••••• I •• I •• I •••• 12-37
SystemTIming .................................................... 2-38

T ABLE OF CONTENTS A60 Technical Manual
SECTION 3: SYSTEM DESCRIPTION
SYSTEM DESCRIPTION ......................................... 3-1
Description of the Assemblies ....................................... 3-1
Main Chassis.Read/Write Boards .............................. 3-1
Computer Board ............................................ 3-1
Main Chassis Input/Output Board ............................. 3-2
Disk Drive Boards ........................................... 3-2
PowerSupplies
............................................. 3-3
Control Panel
.............................................. 3-3
System Block
Diagram
Backplane Wiring Schematics (6 Sheets)
Parts
List
SECTION 4: READIWRITE BOARDS
BOARD DESCRIPTION ......................................... 4-1
Introduction ...................................................... 4-1
Off Disk Decoder .................................................. 4-1
READ PICT Signal ........................................... 4-2
Flaw
Map and SWOP Selection ............................... 4-2
Serial To Parallel Conversion .................................. 4-2
Flaw Map AS 0:9 Bus ........................................ 4-3
Une Assembly Store ......................................... 4-3
Framestore
........................... ,; ........................... 4-3
Framestore RAM
............................................ 4-3
Write Address
Generator .................................... 4-4
Read Address .............................................. 4-6
Read/WriteSelection
....................................... 4-6
Generating the Framestore ControlSignals ..................... 4-6
Interpolator ...................................................... 4-7
The InterpolatorCircuitry
.................................... 4-7
Disk Encoder
..................................................... 4-8
Sector Header Generator .................................... 4-8
RAM BufferControl
and Clocks ............................... 4-9
Buffer RAM Address Generator ............................... 4-9
RAM Buffer ................................................ 4-9
Flaw Encoder .............................................. 4-10
Clock and Computer Board Interface ................................ 4-10
Block
Diagram (3 Sheets)
Schematics
(17 Sheets)
Parts
List
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A60 Technical Manual
TABLE OF CONTENTS
SECTION 5: COMPUTER BOARD
BOARD DESCRIPTION ...................•..................... 5-1
Functions of Each Microprocessor: ............................ 5-1
HLC CPU ........................................................ 5-1
Timecode Reader for the HLC ................................ 5-3
LLC CPU ......................................................... 5-4
Auxiliary CPU ..................................................... 5-5
Graphics Computer .•............................................. 5-5
SCSI and Ethemet .......................................... 5-6
DMA ...................................................... 5-7
MiscellaneousCircuits
....................................... 5-7
Block Diagram (3 Sheets)
Schematics (13 Sheets)
Parts List
SECTION 6: INPUT/OUTPUT BOARD
BOARD DESCRIPTION ...................................•..... 6-1
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The Input Side .................................................... 6-1
CCIR601 and SCSI Input ..................................... 6-1
Luminance Une AssemblyStore ............................... 6-2
Addressing
the Une Assembly Stores .......................... 6-3
Input Une Numbers ......................................... 6-3
SCSI Coder ................................................ 6-3
The
Output Side ............. ' ...................................... 6-4
Analog Outputs ............................................ 6-4
601
Outputs ............................................... 6-5
Sync Generator ................................................... 6-6
Reference Processor ........................................ 6-6
54MhzOscillator Phase Comparator/Error
Generator ............ 6-7
Sync Generator ............................................ 6-7
Computer Control ................................................ 6-8
Block Diagram (4 Sheets)
Schematics, 625 (18 Sheets)
Parts
List
Schematics, 525 (18 Sheets)
Beta Level 1 Schematic (1 Sheet)
Parts List
iii

TABLE OF CONTENTS A60 Technical Manual
SECTION 7: CONTROL PANEL
BOARD DESCRIPTIONS ......................•..•.............. 7-1
CPU Board ....................................................... 7-1
The Trackball ............................................... 7-1
DART and PowerInputs ...................................... 7-2
Switchboard
..................................................... 7-2
Block Diagram (1 Sheet)
CPU Board Schematic (1 Sheet)
Switchboard
Schematic (1 Sheet)
SwHch Listing
Parts
List
SECTION 8: DISK DRIVES
A60 DISK DRIVES ............................................ 8-1
General ......................................................... 8-1
Ribbon
Cables from the A60 ................................. 8-1
Disk Input/Output Board ............................................ 8-2
Servo Circuitry
............................................. 8-3
Power
Check ............................................... 8-3
Write Circuitry
.............................................. 8-4
Read Circuitry
.............................................. 8-4
Disk Read/Write Board
............................................. 8-6
Write Processing
............................................ 8-6
Read Processing
........................................... 8-7
Disk Drive
Interconnection Block Diagram (1 Sheet)
Disk Drive Assembly Block
Diagram (1 Sheet)
Disk
I/O Board Schematics (4 Sheets)
Disk R/WBoard
Schematics (3 Sheets)
Parts
List
SECTION 9: POWER SUPPLIES
iv
POWER SUPPLIES .....•..................•.................... 9-1
Servicing •...•.................................................... 9-1
PowerSupplyAdjustments
......................................... 9-2
Cherokee Supply ........................................... 9-2
Main Chassis Access ........................................ 9-2
Disk Chassis Access ......................................... 9-2
PowerSupply
Replacement ........................................ 9-4
Cherokee Supply, Main Chassis ............................... 9-4
Tamura Supply,
Main Chassis ................................. 9-5
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A60 Technical Manual
TABLE OF CONTENTS
SECTION 10: MAINTENANCE
MAINTENANCE .............................................. 10-1
54Mhz Oscillator Adjustment ........................................ 10-1
Analog Output Configuration/Alignment ............................. 10-3
Introduction ............................................... 10-3
Determining The I/O Board Version ............................ 10-3
Y,R-Y,B-Y With Sync On Y (-01 ,02 Versions) ...................... 10-5
Y,R-Y,B-Y With No Sync (-01,02 Versions) ........................ 10-7
R,G,B With Sync On Green (-01,02 Versions) ..................... 10-9
R,G,B With No Sync (-01,02 Versions) ........................... 10-12
Preview Alignment (-01,02 Versions) ........................... 10-15
Jumper Descriptions(-03,04 Versions, no Piggyback) ............. 10-17
Output Level Adjustment (-03,04 Versions, no Piggyback) ......... 10-19
Jumper Descriptions (-04 Version With Piggyback, 525 only) ....... 10-21
Output Level AdJustment (-04 Version With Piggyback, 525 Only) .. 10-22
Preview Alignment (-03,04 Versions, with or without Piggyback) .... 10-25
Troubleshooting the A60 Disk DriveSystem ............................ 10-26
Is It Luminance or Chrominance? ............................. 10-27
Is Ita Read or a Write Problem? ............................... 10-27
50 (60)
Second A60s ........................................ 10-28
Swapping the A60 Read/Write Boards ......................... 10-28
The Defect File (Flaw Map) PROMs ............................ 10-29
The Hidden Menu .......................................... 10-30
If
the Drive Won't Come 'UP' ................................. 10-34
PowerSupplies ............................................. 10-34
\ First Birthday' .............................................. 10-35
A60 Disk Drive Input/Output Board Replacement ................ 10-36
A60 Disk Drive Read/Write Board Replacement ................. 10-37
A60 Priam Motor Control (Servo) Board Replacement ............ 10-39
Disk Drive Replacement ..................................... 10-41
Disk Drive Cable Interconnect Guide .......................... 10-43
Priam Read/Write-Digital Board ............................... 10-43
Drive RelatedTroubleshooting FI~wchart
APPENDIX
CCIR/EBU 601 Digital Video ................................... 1-1
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The Concept .............................................. 1-1
Digital Sampling ............................................ 1-1
Quantizing Levels ........................................... 1-2
Timing Reference Signals (TRS words) .......................... 1-2
Vertical Blanking ........................................... 1-2
The Clock Signal ............................................ 1-2
The Physical Considerations .................................. 1-3
v

TABLE OF CONTENTS
vi
A60 Technical Manual
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INTRODUCTION
Description
1
The A60 is a real-time componentdigital recordingdevice,providingreal-time playback in
forward or reverse, variable playbackspeeds and random access to recordedmaterial. The
A60 confonns to the 4:2:2 component digital standard and provides CCIR 601 input and
output ports for interface to other CCIR 601 equipment, making it ideal to use in various
graphics environments.
Functionally, the A60 will perfonn like a playback:
or a record VTR, configured in one of
two capacities; the standard configuration of either 25 seconds for the 525 version or 30
seconds for the 625 version, and the optional configuration of 50 seconds for the 525 ver-
sion or 60 seconds for the 625 version.
The
A60 hastwo CCIR 601 videoinputports, eitherone may be selectedfor recordingpur-
poses. The Abekas CoxDV 210 digital video encoder should be used if the input is to be
originatingfrom
an analogcomponentsource,suchas anROB camera or acomponentVTR.
The
A60 has several video output configurations present. The program output is available
both in the digital CCIR 601 fonnat, and as an analog signal thatis eitherROB or Y, R-Y,
B-Y. Sync is available as a seperate output and may be added to the 0 or Y output. The
preview output is available in either of the analog fonnats, and will only differ from the
programoutput bythe presence
of the timecode andframe positioninfonnationplacedover
it.
The
A60 may also have digital video transfer and remote machine control acomplished by
using eitherthe Ethernet or the SCSI ports. The Ethernet port follows the TCP/IPstandard,
andsupports remote login, FTP and TELNET.
The SCSI port is used typically for off line
storage
of video using standard 9-track magnetic streamertape.
A60 Technical Manual Rev 1.1 PRELIMINARY

Physical Description
Ina 25 (or30 if 625) second version, the A60 consists of a mainelectronics chassis with an
integral Winchester disk drive assembly, and a control panel. A 50 (or 60 if 625) second
version requires an additional disk drive assembly to be mounted nearthe main electronics
chassis.
Control Panel
The compact control panel (4.5"H x 11.75"W x 3.5"D) consists of a 5 digit frame number
or timecode display, a trackball, control keys and a numeric keypad. There is also a
monochrome analog video output from the control panel
to be fed to a black and white
monitorfordisplaying system status and allowing access to
the various features of the A60.
The 5 digit display will show the current position of the disks either as a frame number or
as a timecode number.
The trackball
may be used for browsing through the material on the disks, as well as for sys-
tem timing operations.
The numeric keypad allows instant access to a frame/field number,
as well as providing a
means to precisely set system set-up values.
The control keys consist
of; disk control keys using normal transport command terminol-
ogy, segment control keys for defining in and out points
of a segment or a loop, and func-
tion keys for system set-up, configuration and access to the menu monitor functions.
Main ElectronicsChassis
The systems main electronics chassis (12.2SItH rackmount) contains the printed circuit
boards that control the various aspects
of the A60, as well as a Winchester disk drive as-
sembly that will provide 25 seconds (or30 if 625) of time for the A60 system.
Additional Disk Drive ChaSSis (optional)
The optional disk drive chassis (7
1tH rackmount) will provide
an additional 25 seconds (or
30 if 625) of time for the A60 system, making a total of 50 seconds (or60 if 625) possible.
A60 Technical Manual Rev 1.1 PRELIMINARY 2