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
74-M051-A2.
JAN91
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
ii 74-M051-A2.
JAN91

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
74-M051-A2
JAN91
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
74-M051-A2
JAN91

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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JAN91
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
74-M051-A2
JAN91

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

SYSTEM SET-UP
3
Initial System Connections
750 COAX
(BNC) \
Below is a simplified system interconnect drawing of the A60. The component arialog
program
and preview outputs of the systemdifferonly in that the previewmonitorwillhave
the currentdiskposition placed
on it. These component analog outputs may be configured
for eitherR, G, B
or Y, R-Y, B-Y. See the nextpage for more infonnation on this.
The control panel
will have two connections made to it; the serial communications cable
from the main chassis and a BNC cable to a monochrome menu monitor.
To make these
connections,
it will be necessary toremove the rearcover of the control panel.
For more detailed infonnationonsystem connections, see the INSTALLATION section of
this manual.
MENU
MONITOR
PREVIEW PROGRAM
Component
---- Analog -----.
1
Control Panel
Communications
and Power
(750 BNC)
A60 Main Chassis
Cl
CCIR 601 Digital
Inputs and Outputs
-7 Abekas Supplied
Ribbon Cables
Optional Additional
Disk Chassis
A60 Technical Manual Rev 1.1 PRELIMINARY

2.2 Configuring the Analog Outputs
The Preview andProgram analog outputs may be configured foreither R, G, B, or Y, R- Y,
B- Y by setting the followiogjumpers on the A60's Computerboard as shown. The unitis
shippedas R, G, B with
no sync on the G output.
For R, G, B outputs .•.
RemovejumpersW1, W2, W8, W10
Install jumpers W3, W4, W5, W7, W9
For Y, R· Y, B·Y outputs ...
Remove
jumpers W3, W4, W5, W7, W9
Install jumpers W1, W2, W8, W10
For sync to be placed on the G or Y output, jumper W6 should be installed. There are two
spare
jumpers includedwith the board extractorthat may be used if needed. The INSTAL-
LA nON section of this manual should be consulted for more information on connections
totheA60.
2.3 Power-Up Procedure
A 25 or 30 secondversion of the A60 will have one power switch for the whole signal sys-
tem chassis, located
on the front lower righthandside of the unit. The additionaldiskdrive
chassis
of a 50 or 60 second version will have its own power switch, located on the rear of
its chassis. Ensure thatbothswitches are in their off positions beforeplugging in the power
cords.
The signalsystem chassisrequires an outletwitha rating of 8 amps,theadditionaldiskdrive
chassis requires an outlet
of 5 amps. Plug the power cord from each unit into a properly
grounded
II OV AC outlet.
Locate the computer board
in the A60 chassis, board3, and note the position of the switch
on the front edge. This switch must be set to its down position before applying power.
POWERING UP THE SYSTEM.
Step 1 Setthe computer board switch to the DN position (to the left).
Step 2 Apply power to the optional diskdrive chassis (if present).
Step 3 Apply power to the signal system chassis.
Step 4 Setthe computer board switch to the UP position (to the right),
The diskdrivesrequire approximately45 secondsto"sequenceup", thatis, to cometowork-
ing speed. It is possibletohave the menu monitor displaythe status of the diskdrivesduring
this locking
up process, by following the steps on the next page.
A60 Technical Manual Rev 1.1 PRELIMINARY 4

5
MONITORING THE DRIVE STATUS
Step 1 Press the NORM PLAY key. This should get the HOMEmenu to be
displayed on the screen. Seepage 6.
Step 2 Press the MENU key until the cursor is sitting on the line 4) Diagnos-
tics, andpress the
ENTER key. This should bring'up the DIAGNOS-
TICSmenu, whichcontains a display at the bottom withdisk drive status
infonnation.
Thenames"
drY 0 Y" and" drY ~C' refer to thediskdrivessupplyingthe first 25 or 30 seconds
(depending
on whetherthis A60 is a 525 or a 625 system) of video. The names "drv 1 Y"
and "drv 1C' refer to the diskdrives supplying the second 25 or 30 seconds of video. Fol-
lowing each of these drive names will be the status of thatdrive.
UP
Indicates that the drive is running and ready to use.
DOWN
Indicates that the drive is not running (or is not present).
WAIT
Indicates that the drive is in the process of coming up to speed.
LOCKING
Indicates that the drive is up to speed and is in the final stages of attaining the UP status.
The ASO will not try to start both drive OY and drive OC at the same
time, due
to the amount of Initial drivestart-up power required.
2.4 Power-Down Procedure
Ideally, the A60 should remain powered up at all times. If it is necessary to power down
the system, the following procedure should be followed.
IMPORTANT
The disk drives should not be moved or jarred whilepowered up.
Before undertaking anyactivity which would cause excessive
vibration, such as the installation
of equipment in the ASO's rack,
follow the power down proceduredescribed below.
POWERING DOWN THE SYSTEM.
Step 1 Set the computerboard switch to the DN position.
Step 2 Wait approximately 20 seconds, until there is a "clunk" sound from the
diskdrives.
Step 3 Tum off powerat the optional disk drive chassis (if present).
Step 4 Tum off powerat the signal system chassis.
ASO Technical Manual Rev 1.1 PRELIMINARY

2.5 System Timing
Once the systemispowered up, the menu monitershoulddisplay the HOME menu as shown
below. Ifnot,pressthe NORM PLAYkeytogetthe correct
menu display. Press the MENU
key until the cursorissittingon
1) Setup, andpress the ENTERkey on the numerickeypad.
The display should appear similar to the SETUP menu.
HOME MENU
NOTE: USING WITH ENCODERS
The A60 has the ability to provide early output syncs for use with encoders that have a one
linevideodelay, such as theParoudja NTSC encoder. The selection of earlyornormalsyncs
isprovided
by DIP switch 18K located on the computerboard. Section3ofthat DIP switch
should be normally set
to the OFFposition for normal output sync timing, and set to the
ON position to provide syncs that are one line early with respect to reference. The status of
this
mode may be checked by selecting the Miscellaneous menu, and looking at line 5.
A60 Technical Manual Rev 1.1 PRELIMINARY 6

7
SETUP MENU
The MENU button will allow the cursor to be positioned on one of the nine items current-
lyon display.
SETTING THE A60'S SYSTEM PHASE.
Step 1 Select 1) COARSE HPHASE, and press ENTER at the numeric
keypad.
The entire line now becomes reverse video, and the output
timing
may be adjusted with regards to reference in 2 pixel steps (148ns
steps), by usingeither the trackball
or the numeric keypad to alter the cur-
rent value.
This adjustment has a range of +/-50pixels (+/-7.4 IJS).
Step 2 Select 2) FINE HPHASE, as above. This will allow a fine adjustment
in Ins steps, with a range of +/-10008, once again using the trackball or
numerickeypad.
This completes the system timing requirements for the A60. For more information on the
SETUPmenu, see the FAMILIARIZATION section of the A60 Operators Manual.
A60 Technical Manual Rev 1.1 PRELIMINARY

INSTALLATION GUIDE
1
1 Physical Mounting
Both the signal system chassis and the optional additional disk drive chassis are supplied
withrackslides forinstallationinto a standard 19" equipmentrack. The signalsystem chas-
sis, with
it's internal disk drives, will require 12.25" of rack space, the optional additional
diskdrive
will require T' of rackspace. The additionaldiskdrive shouldbe mounted on top
of the main chassis to allow more efficient cable routing.
NOTE: Exercise caution when lifting thesechassis, as they are
approximately 1 OOlb. each.
2 System Interconnects
2.1 SI9nai System to Disk Drive Connections
A 25 or 30 second version of the A60 has all of the system to diskdrive connections done
internally.
A
50 or 60 secondversion of theA60 will have an externaldiskdrive chassis that will need
to be cabledusing Abekas supplied cables. To ensure properconnection to the appropriate
chassis, each connector
on the 7-50 pin ribbon cables is keyed. Use only Abekas supplied
ribbon cables for the interconnects between the chassis.
2.2 RIBBON CABLE CONNECTION TABLE
Signal Chassis Disk Chassis
Disk control .................. Diskcontrol
Write data: Y
................. Y Write data
Write data: C
................. C Write data
Read data A: Y
.............. Y Readdata A
Read dataA: C
.............. C Readdata A
Read dataB: Y .............. Y Read dataB
Read dataB: C
.............. C Read dataB
Ensure that all ribbon connectors are finnly seated at all locations.
A60 Technical Manual Rev 1.1 PRELIMINARY

"U
l:J
m
r
i
z
l>
l:J
-<
N .
DISK CONTROL WRITE DATA REAODATAA REAODATAB
L==::::::::===:I I IY I IY I IY
I IC I lei IC
I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
TlMECODE _ SCSI R-YIRPGMOUT B-YIBOUT Y/GPGMOUT
m~~m I lee e
~
~~~~
•
DIGITAL VIDEO IN #1 DIGITALVIDEO IN #2 e e e
--- -- R-YIRPVWOUT B-YIBOUT Y/GPVWOUT
SMPTE AUX A A A
_. DIGITAL VIDEO OUT #1 DIGITALVIDEO OUT #2 ,., ,., ,.,
--- --. I·~·I
A60 REAR CONNECTIONS

3
2.3 Control Panel to Signal System Connection
The A60 control panel communicates with the signal system by means of an RS422 link,
modified
with the addition of carrying the controlpanelpower. The controlpanelcablewill
have a 15
pin connector on one end, this should be connected to the signal system socket
labeled
KEYBOARD. The other end of the cable has a 9 pin connector and will connect
directly to the controlpanel. The
back cover of the control panel will have to be removed
to gain access tothe 9 pin socket. There is a grommetprovidedfor routing the control cable
through, once the
back is replaced on the controlpanel.
NOTE: The cable length between the control panel and the signal
system chassis must be lessthan 200 feet, In order for the +24 volts
sentfrom the signal system to be able to power the control panel.
Should a distance greaterthan
this be necessary, up to 2000 feet, a
usersupplied external power supply at the control panel will need
to
be utilized. A + 12 volt supply at 2amps will be sufficient. See section
4.2
for pin-out information should a custom cable be necessary.
2.4 Control Panel
to Menu MonitorConnection
The BNC connector present on the left side of the control panel should be connected to a
monochrome monitor,witha usersupplied75
ohm cable, forthe display of operatormenus.
The video out of the controlpanelshould be tenninated with75 ohms. It may be necessary
to slightly alter the scanning height of the monitor to get the entire menu to display.
NOTE: To accessthe BNC connector on some control panels, It Is
necessary to remove the back as was done for the above
communications cable. The connector Is located along the lower
edge of the control panel. There is a second grommet provided for
the routing of the coax cable~ut of the back of the control panel.
A60 Technical Manual
Rev 1.1 PRELIMINARY

3 Video Connections
3.1 Reference
A 2 volt p-p analog composite sync signal should be connected to the left BNC connector
on the back ofthe signal system chassislabeled REF LOOP. The right BNC may be used
as a loop through, however
when not used as such it should be terminated in 75 ohms.
3.2 Video Inputs
There are two digital CCIR 601 videoinputs supplied with the A60. For use with an analog
componentsignal, the Abekas
DV210 may be used. The video input to be used is selected
at the controlpanel
by selectingthe SETUPmenu from the HOMEmenu, andselecting on
line 9 the inputdesired.
For more infonnation, see the A60 OPERATIONS manual.
3.3 Video Outputs
There are two digital CCIR 601 video outputs supplied with the A60, as well as a com-
ponent analogprogram output and a component analog preview output. The preview out-
put will differ from the program output only by the addition of a super-imposed timecode
and frame display. The analog outputs are configured as ROB without sync,
and may be
configured as either ROB or Y /R- Y /B- Y, by setting the following plug-injumpers located
near the front
of the A60's I/O BOARD.
For RGB operation;
Install jumpers W3, W4, W5, W7, and W9
Remove
jumpers W1, W2, W8, and W10
For Y/R-Y/B-Yoperatlon;
Install jumpers W1, W2, W8, and W10
Remove jumpers W3, W4, W5, W7, and W9
3.4
Analog Sync Outputs
There are two BNC outputs on the back of the A60 labeled SYNCS OUT, both of which
containcomposite analog sync at
2V p-p. It is also possible to have sync added to the G or
Y analog component outputs by installing a jumper at W6 on the A60's I/O BOARD.
3.5 Early Output Syncs
The A60 has the ability toprovide early output syncs for use with encoders that have a one
line video delay, such as the Faroudja
NTSC encoder.
The selection
of early or nonnal syncs is provided by DIP switch 18Klocated on the A60's
COMPUTERBOARD. Section3 of thatswitchshouldbe nonnallyset to the OFF position
for
nonnal output sync timing, and set to ON to provide syncs that are one line early with
regard
to reference.
A60 Technical Manual Rev 1.1 PRELIMINARY 4