Tektronix 4923 User manual

TektronbDc
COMMIT TED TO EXCELLENCE
4923
DIGITAL
CARTRIDGE TAPE
RECORDER
P 0. Box soy" —— USER‘S MANUAL
Beaverton, Oregon — 97077
MANUAL PART NO.
070—1908—01
First Printing JUN 1975
This Printing FEB 1979

WARRANTY
Tektronix
warrants
to
the
original
purchaser
that
this
product
and
options,
excluding
customer
supplied
equipment,
is
free
from
defects
in
materials
and
workmanship,
under
normal
use,
for
a
period
of
one
(1)
year
from
the
date
of
shipment.
Tektronix
will,
at
its
option,
repair
or
replace
the
product
if
Tektronix
determines
it
is
defective
within
the
warranty
period,
and
it
is
returned,
freight
prepaid,
to
a
Tektronix Service
Center.
in
the
forty—eight
(48)
contiguous
United
States
and
the
District
of
Columbia,
and
in
other
areas
where
Trktronix
normally
has
service
available
for
this
product,
Tektronix
will
provide
on—site
warranty
service
at
no
charge
during
the
first
ninety
(90)
days
from the date
of
shipment.
Tektronix shall be under no obligation to furnish warranty service if:
a.
Attempts
to
repair
or
service
the
product
are
made
by
personnel
other
than
Tektronix
service
representatives.
b.
Modifications
are
made
to
the
hardware
or
software
by
personnel
other
than
Tektronix
representatives.
c. Damage results from connecting the product to incompatible equipment.
There
is
no
implied
warranty
of
fitness
for
a
particular
purpose.
Tektronix
is
not
liable
for
consequential
damages.
Specifications and price change privileges reserved.
U.S.A.
and
foreign
Tektronix
products
covered
by
U.S.
and
foreign
patents
and/or
patents
pending.
TEKTRONIX is a registered trademark of Tektronix, Inc.
Copyright
©
1975,
1977
by
Tektronix,
Inc.,
Beaverton,
Oregon.
Printed
in
the
United States
of
America.
All
rights
reserved.
Contents
of
this
publication
may
not
be
reproduced
in
any
form
without
permission
of
Tektronix,
Inc.

SECTION 1 DESCRIPTION
About
This
Manual
.
Introduction ....
Standard
Accessories .
Optional
Accessories
4923 Configurations .
Manual Controls and Indicators .
Characteristics
....
TABLE OF CONTENTS
SECTION 2 INSTALLATION and OPERATION
Installation
4923 Standard Configuration
4923 Option 1 ....
Operating
Instructions
Installing the Tape
Cartridge
...
Activating
the
Write
- Protect
Feature
Applying
Power
Operating
Modes .
Read Operations
Write
Operations
Skip Forward Operations
Fast
Forward
Operations
Skip Reverse Operations
Fast
Reverse
(
Rewind
)
Operations
..
REV . A MAY 1977
Page
1-1
1-1
1-2
1-2
1-2
1-5
1-11
2-1
2-1
2-3
2-6
2-6
2-7
2-8
2-8
2-9
2-10
2-11
2-11
2-11
2-11
SECTION 2 INSTALLATION and OPERATION ( cont ) Page
Cartridge
Care
. .
. .
2-12
Check - out and
Familiarization
Procedure 2-13
Operating
Considerations
..
2-16
SECTION 3
4923 Users
SUPPLEMENTAL
INFORMATION
Top
and
Bottom
Cover
Removal
and
Replacement
...
AC Power Requirements .
Line
Voltage
Selection
AC Power Cord and Grounding
Requirements
..
Line
Voltage
Fuse
Strappable
Options
Control
Board
ROM /
PROM
Selection
Minibus
Interface Card
Tapefetch
In
/ Out
...
Auxsense
On /
Pulsed
Routine
Maintenance
Cleaning
the 4923
Case
Cleaning
the Tape
Head
Cartridge
Respooling
....
Self - Test Description and Operation
.
.
3-1
3-3
3-5
3-6
3-7
3-7
3-8
3-8
3-9
3-10
3-10
3-10
3-10
3-11
3-13
3-16
i
14915

TEKTRONIX
.
POREK
ON LINE
OFF
REVERSE
WRITE
STOP
4923
Users
RUN
FORWARD
Fig
. 1-1 . 4923 Digital
Cartridge Tape
Recorder .
1908-28
REV
. A MAY
1977

Section 1
DESCRIPTION
ABOUT
THIS
MANUAL
This
manual
provides the
information necessary
for the
operator
to
install and
operate the 4923
Digital
Cartridge
Tape
Recorder
unit .
The
manual is
divided into three
sections
, as
follows
.
Section
1
provides a
general
overview
of the 4923 ,
describes
its
characteristics
and
features
, and
details the
differences
between
instrument con
figurations . Section 2 contains installation instructions ,
operating
instructions
,
and
familiarization
procedure
.
Section 3 provides technical information , such as line
voltage selection
procedures
,
strappable option
selection
,
and a description of the self - test feature .
REV . A MAY 1977
No servicing information is provided in this manual . For
information on
servicing
,
refer to the
optional
4923
Digital
Cartridge Tape
Recorder
Service
Manual
(
070-1909-00
) .
INTRODUCTION
The 4923 ( Fig . 1-1 ) is a Digital Cartridge Tape Recorder
unit . It provides the capability for local storage of digitally
recorded data
by recording
that data on
a 3M® DC -
300A
Data
Cartridge
. Information
may be
recorded from a
computer
and
/
or a
terminal .
All basic tape operations are controlled from a single
row
of
pushbuttons on the
front panel
of the unit .
In
addition , Start and Stop Read Commands ( DC1 and DC3 ,
respectively )
may be issued
from the
computer ,
the
terminal , or on the tape ( in the case of the DC3 ) . Operation
is described in Section 2 ; the front panel controls are
described later
in this section .
Section
1-4923 Users
1-1

STANDARD
ACCESSORIES
The
following
standard
accessories
are
included with
the
4923
:
Users Manual
3M® DC - 300A Data Cartridge ( 1 )
OPTIONAL
ACCESSORIES
The
following
optional
accessories
are
available
for
the
4923 :
Service Manual
Additional Data Cartridges
(
package
of
5 )
070-1908-01
1-2
070-1909-00
119-0680-01
4923 CONFIGURATIONS
There are two basic configurations for the 4923 unit ; the
standard configuration ( 4010 - series terminal based ) and
Option 1 ( RS - 232 - C ) . This manual documents both in
struments , since
most
operations are
identical in both
versions . When any detail of the unit applies to only one
version ( such as installation instructions ) , it will be noted
in
the
text .
The "
standard
" 4923
interfaces
directly
to
any 4010
series
terminal
through
the
terminal
minibus ;
data is
then
routed
through
the
minibus
to
the
modem /
computer
with
or
without
local
display
.
Control
of
the Local
/
Line
function
is
assumed by
the
terminal's
LOCAL /
LINE
switch
.
The
4923
Option
1
contains
an
interface
for RS -
232 - C
devices ,
with
connections
provided
for a
terminal
and
for a
modem
/
computer . In
the Option
1
configuration ,
control
of
the Local
/ Line
function
is
provided
by
a
button on
the
front
panel
.
Note
,
however
,
that if
the
terminal
also
has
a
Local
/ Line
control
,
both
the
terminal
and
the 4923
must
be
in
the
On
Line position
in
order
to be
On
Line ,
but only
the
4923
need be
in the
LOCAL
position
for
both
the
terminal
and
the
4923 to be
in
Local .
It is
therefore
recommended
that the
terminal's
control be
left in
the On
Line position
,
leaving
Local /
Line
control
to
the 4923 .
The
positions
occupied
by the
4923
in
these
two
configurations
are
illustrated
in
Fig .
1-2 .
Description -
4923
Users
REV
. A MAY
1977

COMPUTER
1 :
101010
Diev
FERREBEE
40
40
40
40
www.ANDA
x
ood
000
CATAAR
D
000
DO
REV . A MAY 1977
Communication
Link
B
of
TERMINAL
M
B
A
Data
Communications
Interface
Fig . 1-2a . Standard 4923 position in a system .
Description
-
4923
Users
4923
TEK
TRONER
4003
1908-2
1-3

COMPUTER
10
****
1-4
EEEEEEE
Diev
*****
a
юли
CEEEEE
MAAJAAM
JAMAAJA
AAA )
MI
LHHI
H
+
d
000
lood
1000
33880
DO
Communication
Link
4923 Option 1
TEKTRONIX
00000
Fig . 1-2b . 4923 Option 1 position in a system .
Description -
4923
Users
TERMINAL
B
BB
B
B
1908-3
REV . A MAY 1977

MANUAL
CONTROLS
AND
INDICATORS
There are six
functional
controls on the
front
panel
, in
addition
to
the
POWER
switch
. The
functions
initiated
by
the
controls
are
described in
further
detail in the
Opera
tion
section
.
In
addition ,
there
are
five
indicators (
LEDs
)
,
and
a
baud
rate
control on
the back
panel of
the Option 1
unit only .
The
control panel is shown
in Fig . 1-3 ;
the
functions
of
the
controls and
indicators
are as
follows
:
POWER Switch
The
POWER
switch is
located on the
front
panel and is
used to
apply
power
to
the tape
unit logic ,
transport
control , and interface .
NOTE
On
the
standard 4923 ,
terminal power
must be
applied prior to
the
4923
power
, to
microprocessor initialization .
ensure
RUN Control
A
single
momentary push of the
RUN
button
places the
4923
in
the
Read
Enable
state
,
allowing it to
respond to a
DC1 ( or another
push ) as a Start
Read
command . The unit
REV
. A
MAY
1977
reads until a
DC3 is
encountered , then waits
for
another
Start Read
command . If the
RUN
button is held
down
, the
unit reads
continuously as long
as it is held (
until the
end
of the file ) ,
ignoring
DC3's .
It is also necessary to press the RUN control while
holding the WRITE control , in order to initiate a Write
Operation .
Pushing the
RUN control
when a
blank tape
area
is
encountered ( at the end
of the
written data area )
will cause
a momentary forward motion , then a return to the end of
the last file .
READ
Indicator
The
READ
indicator (
above the
RUN
button
) il
luminates
during a
Read
Operation .
WRITE Control
The
WRITE
contol
is
held
down while the
RUN
button is
pressed in
order
to
initiate a
Write
Operation .
WRITE
Indicator
The WRITE indicator ( above the WRITE button ) il
luminates
during a
Write
Operation .
Description
-
4923 Users
1-5

TEKTRONIX
Ⓡ
1-6
POWER
OFF
ON
LINE
REVERSE WRITE
STOP
4923
RUN
Description
-
4923
Users
FORWARD
Fig
. 1-3 .
4923 Controls and
Indicators
. The
4923 Option 1 is
shown ; note
that
the ON
LINE
button is
replaced by
the
BINARY
button in the
Standard
unit .
1908-29
REV .
A
MAY
1977