Tektronix 5000 Series User Manual

4924
,
670-4525-04
CONTROL
BOARD M35813
There
have
been
several
changes
to the
4924
Control
Board (
670-4525-03
) .
Because of
the
number of
these
changes
the
board
has
been
relayed
out
and
now is
a
670-4525-04
.
This
new
control
board
no
longer
uses a
-5
power
supply to the
ROMS .
Note also
that
all
other
levels of
control
boards
except
-00 do not
need the -5V
power
supply .
The
reason the
-5V
is
part
of the
4924
control
board
is
that
approximately the
first 50 to
100
control
boards
(
670-4525-00 ) had
EPROMs and
needed the
-5V .
Those
few
670-4525-00
control
boards
should
have
been
updated by
replacing the
EPROMs
with
ROMS
and
rolling the
board
level
.
Therefore
there
is
no need
for the
-5V
regulation
chassis
mounted
transistor
Q1010 .
Also
you
will
observe a new
strap on the
board
located
near
the
RAM ,
labeled IK
and 2K
.
This
strap
should be in
the 1K
position .
The
4924
(
670-4525-04 )
uses 1K
ROMs
and
the 2K
ROM
position is
for
possible
future
use
.
In
addition
there has
been
a
change in
RAM
from the six
256X4 bit
RAM to
two TK X
4
bit
RAM
.
The U
numbers in
the
schematics on
the
-03
level
board
do
not
correspond to the
U
numbers of
the new
-04
level
board . New
schematics
should
be
available
soon
.
--Darrell
McGiverin
63/503 , ext . 3786
119-0845-00 CALCOMP , FLEXIBLE DISK DRIVE , PRESSURE PAD
Reference :
Wizard Article issue 10-5
4907/4905 Floppy Disk Media
119-0848-01 , 119-1011-01
Instead of
trying
to
clean the
pressure
pad it is
recommended to
replace
the
pad .
Tek
part
number for
the
sticky
back
pad
for
the
Calcomp is
118-0207-00
.
--Bill
Hatch
63/503 , ext . 3787
-37
June
27
,
1980
Issue
10-13

Tektronix 5000 Series Specifications

General

Brand	Tektronix
Model	5000 Series
Category	Test Equipment
Language	English