Circuit Description—
7623/R7623
Service
Fig. 3-28. Output waveforms
of Timing stage.
Fig. 3-29. Detail of outputs at pins 12, 13, 14, and 16 of U2126.
to
produce a
character. The collector of Q2138 is also
connected
to Character
Generator No. 2,
U2272 through
C2140, CR2140.
This activated
U2272 during the quiescent
period
of the Strobe pulse (collector
of Q2138 negative)
and
diverts the
output current of Row Decoder U2185 to
row 2.
The purpose of
this configuration is to prevent the
Zeros Logic and Memory
stage U2232 from storing
incorrect data
during the quiescent
period of the Strobe
pulse. When
the
Strobe pulse goes positive, CR2140 is
reverse
biased to disconnect Q2138
from U2272 and allow
the Row
Decoder
stage
to operate in the normal
manner.
The
next
signal to be produced is the Vertical/
Horizontal Channel
Switch OFF Command at pin 13. This
positive-going
signal
disconnects the plug-in signals in the
vertical
and horizontal deflection systems
so the
plug-in
units
do
not
control the position of the CRT beam during
the
readout display. The Ready signal derived from this
output
is
connected to the Decimal Point Logic and
Character
Position Counter stage and the Format Generator
stage (see diagram
10).
The
Readout
Intensity output at pin
12 is produced next. This current
is connected to the CRT
Circuit
to unblank
the
CRT to the intensity level deter
mined by
READOUT intensity control R2124. The Char
acter
Scan
ramp at pin 16 started to go
negative as this
3-37
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 ...