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

2015
PAS
STOP
Control
When
pressed , the
STOP
control
causes
any
tape
operation in progress to cease .
READY
Indicator
The
READY
indicator (
above the
STOP
button
) il
luminates when the tape unit is in the Stop state , and is
ready to undertake another operation . The READY in
dicator
(
alone
)
should illuminate
when power is
applied .
FORWARD Control
A single momentary push of the FORWARD control
initiates the Skip
Forward
function
,
which causes the unit
to skip over one file at 30 inches per second . If the button is
held pressed for approximately 1 second , the unit enters
Fast
Forward
mode
( 90
inches
per
second
)
and
winds until
the end of
the
usable tape
space is
reached , or until
the
STOP
button
is
pressed
,
whichever
occurs first .
FORWARD Indicator
The
FORWARD
indicator
illuminates
during
either type
of
Forward
operation .
REV . A MAY 1977
REVERSE
Control
A
single
momentary
push of the
REVERSE
control
initiates the Skip Reverse function , which causes the unit
to skip backward over one file at 30 inches per second . If
the button is held pressed for approximately 1 second ,
Fast Reverse ( Rewind ) mode begins , causing the tape to
rewind at 90 inches per second until the beginning of the
usable tape space is reached , or until the STOP button is
pressed ,
whichever
occurs first
.
REVERSE Indicator
The REVERSE indicator illuminates when either type of
Reverse
operation is in
progress .
ON
LINE
Control (
Option 1
Only )
This button controls whether the RS - 232 - C interface is
on line to the computer ( button depressed ) , whether it is
operating locally , or with the terminal only .
BINARY
Control
(
Standard
Configuration Only )
In the
READ Mode , this
switch
suppresses
the
detec
tion of DC1 , DC3 , and NUL characters when the BINARY
switch is depressed . ( All data is transferred without
decoding ; DC1 will not start the tape , nor will DC3 stop the
tape . ) In Read mode , the Read Enable state is eliminated .
Description -
4923
Users
1-7

BAUD RATE Controls ( Option 1 Only )
The BAUD RATE control applies to the Option 1 only ,
and
is
located on the
back panel
. ( Back panel
controls
are
shown in
Fig .
1-4a . ) The
inner (
smaller )
knob selects the
rate
at
which
data is
transferred
to and
from
the
modem ,
and
from the
terminal
. The other
(
larger
) knob
selects the
data
transfer rate from the
4923 to the
terminal only ,
independent
of
the
other
three
paths .
The
rate to
the
terminal
may be set
higher
than
the
other
rates ; it
must be
set
to at
least the
same rate .
Selectable
data transfer
rates
are
110 ,
150 ,
300 ,
600 ,
1200 ,
2400 ,
4800 , or
9600
baud .
LOCAL
ECHO /
TEST /
COMPUTER
ECHO
Switch
This
switch ( Option 1 only
, located
on the back
panel )
determines
whether
echo
to
the
terminal will
be
supplied
1-8
by
the
computer or
the
4923
interface
.
The TEST
position
of
the switch
enables
the 4923's
self
-
test
feature .
The
self
test
feature is
detailed in
Section 3
of this
manual .
TEST
/
OPERATE (
Standard Configuration
Only
)
On
standard (
terminal
interface )
4923's
,
this switch
has
the
same
function as
the TEST
position
of
the LOCAL
ECHO /
TEST /
COMPUTER
ECHO
switch
, enabling
the
self -
test
feature .
The
self - test
feature
is
detailed
in
Section
3
of this
manual . The
switch is
located on the
back panel
(
Fig .
1-4b . )
Description
-
4923
Users
REV
. A MAY
1977

REV
. A MAY 1977
THIS INSTRUMENT IS
MANUFACTURED UNDER US PATENT
Re 28 147 FOREIGN
PATENT NUMBERS GIVEN ON
REQUEST
EXTRONIX INC
JUSSA
ECHO
LOCAL TEST
COMPUTER
SERIAL NO .
BO
10440
TEKTRONIX
BEAVERTON ,
OREGON
, USA
MODEM
CAUTION HIGH
VOLTAGE INSIDE REFER SERVICE
TO
QUALIFIED PERSONNEL TO AVOID ELECTRICAL SHOCK ,
DISCONNECT POWER INPUT BEFORE REPLACING FUSE
TO CHANGE UNE VOLTAGE REFER TO INSTRUCTION
MANUAL
NFPA TYPE II
A
4923
OPT 1
B
TO
TO
TERMINAL
150
AC B
( SEE
INSTRUCTION MANUAL )
600
1200
MODEM
110
FROM
MODEM AND
TERMINAL
BAUD
RATE
300
2400
TERMINAL
4800
9600
82-80
AMPS ( MAX ) 15
WATTS
(
MAX
)
190
Fig
. 1-4a .
Option 1 back
panel
controls .
Description -
4923
Users
VOLTAGE RANGE
100 115 120
200 220 230 240
FREQ
48
66Hz
AT 115 / 230V
INTERNALLY SET
FOR 115 VOLTS
FUSE
U
FUSE
1A SLOW
.6A SLOW
1908-30
1-9

1-10
UNUNING
THIS
INSTRUMENT
IS
MANULACTURED UNDER
US PATENT
Re
26,147
FOREIGN PATENT
NUMBERS GIVEN ON
REQUEST
ELKTRONIX
INC
TEST
KOLOGS
OPERATE
SERIAL
NO .
BO
15189
TEKTRONIX BEAVERTON
, OREGON , USA
CAUTION HIGH VOLTAGE INSIDE REFER SERVICE TO
QUALIFIED
PERSONNEL 10 AVOID
ELECTRICAL
SHOCK ,
DISCONNECT POWER
INPUT
BEFORE REPLACING FUSE
TO
CHANGE
LINE
VOLTAGE
REFER
TO
INSTRUCTION
MANUAL
NEPA TYPE
II
A
LISTED
BUSINESS
EQUIPMENT 688k
4923
00
)
J1001
0000
AMPSIMAXE15
WATTS ( MAX
: 190
FUSE
VOLTAGE
RANGE
FUSE
100 115 120 IA
SLOW
200 220
230
240.6A
SLOW
FREQ 48 66Hz
A. 115/2 TOV GONZ
INTERNALLY SET
FOR
115
VOLTS
FUSE
980
)
Fig . 1-4b . Standard version back panel .
Description
-
4923
Users
1908-31
REV .
A
MAY
1977

Character Format
Characters
per
Record
Records per File
Characters
per
Cartridge
Tracks
RECORDING FORMAT
Head
type
Table 1-1
REV . A MAY 1977
CHARACTERISTICS
8 - bit serial
with Isb (
least
signifi
cant bit ) first , msb ( most signifi
cant bit
)
last
.
128
8 -
bit
bytes
.
Variable . The file length is the
number
of
Records
between
the
start of the Write Operation and
the
time
when the
STOP
button is
pressed ,
or End
of
Tape .
200,000
characters ,
nominal .
Two data tracks ( 1's and 0's ) ,
combined into one data channel .
Single
Read /
Write
Head .
Recording
Format
The
format
used by the
4923 to
record data
onto the
tape
and
read data
from
the
tape is
detailed
in Table
1-1 .
Drive Characteristics
The characteristics of the tape drive are detailed in
Table 1-2 .
Drive
Speed
:
Normal
Fast Forward /
Rewind
Drive
Type
Drive Method
Table 1-2
DRIVE CHARACTERISTICS
Description
-
4923
Users
30 inches per
second .
90 inches per second .
Servo - controlled dc motor with
tachometer .
Single
capstan
drive
against
capstan
drive
roller
.
1-11

Cartridge
Characteristics
The
characteristics of
the
digital tape
cartridge used in
the 4923 are described in Table 1-3 .
Cartridge
Type
CARTRIDGE CHARACTERISTICS
Weight
Cartridge
Dimen
sions (
outside
)
Tape Length
(
usable
storage
)
Position Markers
(
light
sensing
holes
)
Write -
Protection
1-12
Table 1-3
3M®
DC
-
300A
Data
Cartridge
(
or
equivalent ) .
8
ounces .
4 inches by 6 inches by 0.665
inches .
300 feet .
EOT (
End
of
Tape .
BOT (
Beginning Of
Tape ) .
Load
Point
.
Early Warning .
A
screwdriver -
activated
cylinder
prevents writing to the tape when
the arrow points to the SAFE
marker
.
Physical
Dimensions
The physical dimensions of the 4923 Digital Cartridge
Tape
Recorder unit
are
listed in
Table 1-4
.
Width
Depth
Height
Weight
Description
-
4923
Users
Table 1-4
PHYSICAL
DIMENSIONS
8.75
inches
17.25
inches
6 inches
17
pounds
REV
. A MAY 1977

Environmental
Specifications
The
environmental
parameters for
the 4923
are
listed in
Table 1-5 . The
parameters for the
cartridge are
listed
separately
, in
Table
1-6 .
4923
ENVIRONMENTAL
SPECIFICATIONS
Temperature
Operating
(
with
tape )
Storage
(
without
tape )
Altitude
Operating
Storage
Humidity
Table 1-5
REV
.
A
MAY
1977
10 ° C
( 50 ° F
) to
40 ° C (
104
° F
)
-40
° C (
-40 ° F )
to + 65 °
C ( 149 °
F )
Up
to
15,000
feet
Up
to
50,000 feet
20 % to 80 % , NON - CONDENSING
Table
1-6
CARTRIDGE ENVIRONMENTAL SPECIFICATIONS
Temperature
Operating and
Storage
with
data
Transportation
Humidity
Conditioning
Description - 4923
Users
+ 5 ° C
( 41 °
F ) to
+ 45 °
C (
113
° F )
-40
° C
(
-40 ° F ) to
+ 45 °
C (
113 ° F )
20 % to 80 %
, NON -
CONDENSING
The
cartridge must
be con
ditioned to
the
operating
environ
ment for a
time
equal
to
the time
away from the environment , not to
exceed
eight
hours .
1-13

INSTALLATION AND OPERATION
INSTALLATION
4923
Standard
Configuration
Section 2
REV . A MAY 1977
The 4923 standard instrument configuration interfaces
directly to the 4010 - series terminal , and through the
terminal to the modem / computer . Installation consists of
selecting the appropriate line voltage range , and connec
ting to the terminal and to the power source . Information
on line voltage selection is found in Section 3 of this
manual . To complete the interconnection of the 4923 , use
the
following
procedure
:
1. Place the 4923 in a suitable location close to the
terminal . The standard interconnecting cable is 6 feet
long ; the
4923 must be
located
within
the
cable's
range .
CAUTION
Do not
install
or
remove
cards
while power is
applied
to the terminal .
2. With the terminal power off , gain access to the
minibus within the terminal pedestal ; details are found in
the terminal manual . Install the Minibus Interface card in
one of the spare connectors in the terminal Mother Board ,
as shown in Fig . 2-1 . ( It may be necessary to install a
Mother Board extender to provide room for the interface ;
refer to the
terminal
manual
for details . )
3.
Thread the end of
the
interconnecting
cable
through the access opening in the rear of the terminal
pedestal , threading the cable end to the front of the
pedestal , for attachment to the Minibus Interface card .
Section 2-4923 Users
2-1

0000000000000
3
00000000000
00000000000
000
Ground
Spade
must
connect
to an
available
ground lug on
the
terminal
2-2
III
Fig .
2-1 .
Minibus
Interface
installation .
Installation and
Operation
- 4923 Users
100P
( 1908-6 ) 1909-83
REV . B ,
JAN
.
1978