Circuit
Description
—7623/R7623 Service
The
variable persistence pulses are differentiated
by
capacitor
C1560.
The
negative
pulses are connected to the
base
of transistor Q1561
and
the collector of transistor
Q1546.
When
the
SAVE button is not pressed in, transistor
Q1533
is on and Q1540 is off. The collector load for
Q1533
is the PERSISTENCE control. The voltage level at
Q1546 is
determined by either
the
collector of Q1533
(Variable
Persistence
Mode) or
Q1540 (Save Mode). The
pulse width
at
Q1546 is directly proportional to Q1546
collector current. When
the STORED INTEN
control is in
the
Save Mode,
it has the same effect on the pulse width as
the
PERSISTENCE control. In the Variable Persistence
Mode,
the pulses are connected to the Bi-Stable target. In
the
Save Mode, the
pulses are connected to the flood gun
cathode.
Flood
Gun
Anode
and CE
Circuits
The
basic
circuit
is a two-transistor high-speed operation
amplifier.
The gain
of each amplifier stage is changed by
gating
different input
resistors into the input circuit at
different
times
for
different modes. The control circuit is
transistor
Q1500 and Q1518. When transistor Q1500 is
turned
on, resistors R1503 and R1523 become part
of the
input
resistance to their amplifiers.
When transistor QI518
is
turned on by
pulse QF, resistor R1520 is removed from
the input circuit
and resistor R1522 is added to the input
of
the FGA
amplifier. See Fig. 3-42 for the basic block
diagram
of the FGA
and
CE1
circuits.
CE
3
and
CE
2
Circuits
The basic
circuit is
a two-transistor operational amplifier.
The
gain of each
stage is controlled by the input resistance
to the
amplifier. At QT time, CE3 Prep adjustment with
resistor R1468
and
CE2 Prep adjustment with
resistor
R1482
are added to each amplifier stage. After GT time the
input
resistors are R1471 and R1486. In the Bi-Stable
mode,
Z10 prevents the CE3
and
CE2 adjustments from
having
any
control over
the circuit.
Fig.
3-42. Basic Block Diagram of the FGA and CE
Circuits.
3-55
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 ...
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Page 242: ...7623 R7623 OSCILLOSCOPE b ...
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Page 247: ...7623 R7623 OSCILLOSCOPE 112 ...