Circuit
Description
—7623/R7623
Service
Horizontal
deflection
signal
to
right
deflection
plate
of
CRT
Horizontal
deflection
signal
to left
deflection
plate
of
CRT
Fig.
3
19.
Horizontal Amplifier
detailed block diagram.
limit
the
current to U510. At
the same time, current is
added
through CR531
and
CR532 from the display limited
current
line. This added current maintains about
the same
DC
currents through the output circuit in both positions of
the
BEAM FINDER
switch. The
signal at the output is
connected
to
the right and left amplifier inputs. Resistor
R525 adjusts the
amplifier for
center screen deflection in
the
absence of an input signal to U510.
Output
Amplifier
Transistors Q539,
Q551,
Q558, and Q560 function as a
current driven
feedback
amplifier. The
input
current is
converted
to a voltage output signal to drive the right
horizontal
CRT deflection plate. R558 establishes the
quiescent
current level for series connected transistors
Q558
and
Q560.
The
CRT
deflection
plates present a capacitive load to
the
amplifier, which requires additional current during fast
transients.
Extra
current for positive excursions is provided
by
Q551 via R555, C555, and Q558; for
negative excur
sions, by Q560
via
R563.
Resistor
R556 reduces
the power dissipation in Q558.
Resistors R566, R567,
and R569 provide DC feedback and
establish
low frequency gain. Capacitors C566 and C588 are
adjusted for correct
gain at fastest sweep rates. C584-R584
provide
thermal compensation.
Basic
operation of the
Left Output Amplifier stage is the
same
as
described for the
Right
Output Amplifier. C586
and
C588 set the gain
for the fastest sweep rates (C588
affects
both
Right and Left Output Amplifiers). The output
signal
at the collectors of Q578-Q580 connects
to the left
deflection
plate
of
the
CRT
through R585.
The
series
circuit CR549 and
R549 stabilize the
output
amplifier
during
fast retrace intervals. R535 is
adjusted to
balance the negative excursions of the right and
left sides of
the amplifier
when the time base
plug-in
is
used in X10
Magnified mode.
CALIBRATOR
AND
FRONT
PANEL
SWITCHING
The
Calibrator
and Front Panel Switching circuit pro
vides
output
voltage to the
front-panel Calibrator pin-jacks
and includes the front-panel switches and controls.
Fig. 3-20
shows a detailed
block diagram of the Calibrator
portion
of
this
circuit. A schematic of this circuit is shown on
diagram 10
at the rear
of this manual.
3-22
Содержание 7623
Страница 1: ...MANUAL 7623 R7623 STORAGE OSCILLOSCOPE SERVICE MANUFACTURERS OF CATHODE RAY OSCILLOSCOPES ...
Страница 51: ...Fig 3 2 Block diagram of Logic circuit Circuit Description 7623 R 7623 Service ...
Страница 72: ...W NJ 00 Fifl 3 22 Low Voltage Power Supply detailed block diagram ...
Страница 73: ...Circuit Description 7623 R 7623 Service ...
Страница 74: ...CO NJ CD Fig 3 22 Low Voltage Power Supply detailed block diagram cont ...
Страница 75: ...Circuit Description 7623 R 7623 Service ...
Страница 82: ...Ca W G Fig 3 27 Detailed block diagram of Readout System Circuit Description 7623 R 7623 Service ...
Страница 97: ...Circuit Description 7623 R7623 Service 3 51 ...
Страница 98: ...Circuit Description 7623 R7623 Service Fig 3 39 Output Pulses for the Storage Circuits 3 52 ...
Страница 99: ...Circuit Description 7623 R7623 Service Fig 3 40 Basic Block Diagram of the Storage Timing 3 53 ...
Страница 103: ...Circuit Description 7623 R7623 Service 3 57 ...
Страница 108: ... Ç À Fig 4 2 Location of circuit boards in the 7623 ...
Страница 109: ...Fig 4 3 Location of circuit boards in the R7623 Maintenance 7623 R 7623 Service ...
Страница 111: ...Maintenance 7623 R7623 Service Fig 4 5 Electrode configuration for semiconductors used in this instrument ...
Страница 113: ...Maintenance 7623 R7623 Service Fig 4 6 Circuit Isolation Troubleshooting Chart 4 9 ...
Страница 165: ...7623 BLOCK DIAGRAM ...
Страница 166: ...7623 R7623 Service Front of Board ...
Страница 167: ......
Страница 168: ...FL ...
Страница 169: ......
Страница 173: ...7623 Logic ...
Страница 175: ...Vertical Interface A4 ...
Страница 178: ...Vertical Interface ...
Страница 180: ...Vertical Amp A5 ...
Страница 184: ...Horizontal Amp A6 ...
Страница 186: ...7623 TO P450 VERT AMP 3 HORIZONTAL AMPLIFIER ...
Страница 188: ...Output Signals A7 ...
Страница 190: ...FROM 7G23 Output Signals g ...
Страница 195: ...FROM LV POWER SUPPLY 7623 CRT CIRCUIT ...
Страница 197: ......
Страница 200: ......
Страница 202: ...Storage Output A14 ...
Страница 204: ......
Страница 205: ...7623 R7623 Service Fig 6 14 A15 Cal Storage circuit board ...
Страница 208: ......
Страница 209: ...7623 R7623 Service Fig 6 15 A16 Readout System circuit board ...
Страница 213: ......
Страница 242: ...7623 R7623 OSCILLOSCOPE b ...
Страница 243: ...151 ...
Страница 246: ...20 ...
Страница 247: ...7623 R7623 OSCILLOSCOPE 112 ...