Circuit Description—
7623/R7623
Service
Column
—One of
the vertical lines in the Character Selection
Matrix
(see Fig. 3-25).
Columns C-0 (column zero) to
C-10
(column 10) can be addressed in
the 7623 system.
Row
—
One
of the horizontal lines in the Character Selection
Matrix
(Fig. 3-25). Rows R-1 (row 1) to R-10 (row 10)
can
be addressed in this system.
Time-slot-A
location in
a pulse train. In this Readout
System,
the pulse train consists
of 10 negative-going
pulses.
Each of these
time-slots is assigned a number
between
one and ten. For example, the first time-slot is
TS-1.
Each word in the
readout display can contain up to
10
characters,
although the typical display will contain be
tween two and seven
characters per word. The characters
are selected from
the
Character Selection Matrix shown in
Fig. 3-25.
Any one
of the 50
separate characters
can be
addressed and
displayed
on the CRT. In
addition, 12
operational addresses are
provided
for special instructions
to
the Readout System. The unused
locations in the Matrix
(shaded
areas) are available for future expansion of the
Readout
System. The method of addressing the locations in
the
Character Selection Matrix is described in the following
discussion.
Time-multiplexing-Transmission
of data from two or more
sources
over
a
common path by using different time
intervals for
different signals.
Developing
the Display.
The following basic description
of
the Readout System uses the block diagram shown in
Fig.
3-27. This description is
intended to relate the basic
function
of each stage to the operation of the overall
Readout
System. Detailed information on circuit operation
is
given
later.
Display
Format.
Up
to six words of readout information
can
be
displayed on the CRT. The position of each word is
fixed
and
is
directly related to the plug-in unit from which
it
originated. Fig. 3-24 shows
the
area of the graticule
where
the readout from each plug-in unit is displayed.
Notice
that channel
1
of each plug-in unit is displayed
within
the
top division of the CRT and channel 2 is
displayed directly
below within
the bottom division. Fig.
3-26 shows
a typical display.
Left
Vert
Right
Vert
Horizontal
Fig.
3-24. Location of readout words on the CRT identifying the
originating plug-in unit and channel
(one
complete frame shown,
simulated readout).
The key block
in the Readout
System is the Timer stage.
This
stage
produces the
basic signals which establish the
timing
sequences within the Readout System. Period of the
timing
signal
is about 250 microseconds
(drops to about
210
microseconds when Display-Skip is received; see
detailed
description
of
Timing stage for
further informa
tion).
This stage also produces control signals for other
stages
within this circuit and interrupt signals
to the
Vertical
Interface,
Horizontal
Interface, CRT
Circuit,
and
Z-Axis
Logic
stage which allow
a readout display to be
presented. The
Time-Slot Counter stage
receives a trape
zoidal
voltage signal from the Timer stage
and directs it to
one
of ten output lines. These output lines are labeled TS-1
through TS-10 (time-slots
one
through ten) and are
connected
to the vertical and
horizontal plug-in compart
ments
as
well as
to various stages within the Readout
System. The
output lines are energized sequentially so
there
is
a pulse
on only one of the 10 lines
during any 250
microsecond
timing period. When
the Time-Slot Counter
stage
has
completed time-slot 10, it produces an End-of-
Word
pulse
which
advances the system to the next channel.
Two
output
lines, row and column, are
connected from
each
channel of the plug-in units back to the Readout
System.
Data
is
encoded on these output lines by con
necting
resistors between them and the time-slot input
lines.
The
resultant
output
is a sequence of ten
analog
current
levels which range
from zero
to one milliampere
(100
microamperes/step)
on
the
row and column output
lines.
This row and column correspond to the row and
3-32
Summary of Contents for 7623
Page 1: ...MANUAL 7623 R7623 STORAGE OSCILLOSCOPE SERVICE MANUFACTURERS OF CATHODE RAY OSCILLOSCOPES ...
Page 51: ...Fig 3 2 Block diagram of Logic circuit Circuit Description 7623 R 7623 Service ...
Page 72: ...W NJ 00 Fifl 3 22 Low Voltage Power Supply detailed block diagram ...
Page 73: ...Circuit Description 7623 R 7623 Service ...
Page 74: ...CO NJ CD Fig 3 22 Low Voltage Power Supply detailed block diagram cont ...
Page 75: ...Circuit Description 7623 R 7623 Service ...
Page 97: ...Circuit Description 7623 R7623 Service 3 51 ...
Page 98: ...Circuit Description 7623 R7623 Service Fig 3 39 Output Pulses for the Storage Circuits 3 52 ...
Page 103: ...Circuit Description 7623 R7623 Service 3 57 ...
Page 108: ... Ç À Fig 4 2 Location of circuit boards in the 7623 ...
Page 109: ...Fig 4 3 Location of circuit boards in the R7623 Maintenance 7623 R 7623 Service ...
Page 113: ...Maintenance 7623 R7623 Service Fig 4 6 Circuit Isolation Troubleshooting Chart 4 9 ...
Page 165: ...7623 BLOCK DIAGRAM ...
Page 166: ...7623 R7623 Service Front of Board ...
Page 167: ......
Page 168: ...FL ...
Page 169: ......
Page 173: ...7623 Logic ...
Page 175: ...Vertical Interface A4 ...
Page 178: ...Vertical Interface ...
Page 180: ...Vertical Amp A5 ...
Page 184: ...Horizontal Amp A6 ...
Page 186: ...7623 TO P450 VERT AMP 3 HORIZONTAL AMPLIFIER ...
Page 188: ...Output Signals A7 ...
Page 190: ...FROM 7G23 Output Signals g ...
Page 195: ...FROM LV POWER SUPPLY 7623 CRT CIRCUIT ...
Page 197: ......
Page 200: ......
Page 202: ...Storage Output A14 ...
Page 204: ......
Page 205: ...7623 R7623 Service Fig 6 14 A15 Cal Storage circuit board ...
Page 208: ......
Page 209: ...7623 R7623 Service Fig 6 15 A16 Readout System circuit board ...
Page 213: ......
Page 242: ...7623 R7623 OSCILLOSCOPE b ...
Page 243: ...151 ...
Page 246: ...20 ...
Page 247: ...7623 R7623 OSCILLOSCOPE 112 ...