Calibration
—7623/R7623
Service
d.
Connect
a
10X probe
from the test-oscilloscope to
the
Z-Axis test point (see Fig. 2-2) and the
probe ground
lead to chassis
ground.
e.
Set
the test-oscilloscope
to DC input and a display of
5
volts/division
(including probe attenuation), position the
trace to the center graticule line.
f.
ADJUST-INTENSITY
control
for a display
ampli
tude
2
volts above the center graticule line.
g.
ADJUST-CRT
Grid Bias adjustment R1261 (see Fig.
2-2) until
the trace
on
the 7623 (R7623) is just extin
guished.
Set INTENSITY for a
viewable trace.
4B.
Check
Z-Axis
DC
Levels
a.
Set
the test-oscilloscope for 10 V/division, DC input.
Connect
its
10X
probe to the 7623 (R7623) Z-Axis test
point (see
Fig.
2-2) and probe ground lead to chassis
ground.
b.
Set
the time base plug-in in the 7623 (R7623) to 50
ms/division
not intensified and the test-oscilloscope time
base
to
1 sec/div.
c. Set the calibration fixture Position control
to posi
tion
the trace
vertically off screen, and set the INTENSITY
control
fully clockwise.
d.
CHECK-The
test-oscilloscope display
amplitude
should
be at least 58 volts, note this reading.
e.
Set
the 7623 (R7623) time base plug-in to 0.1
second/di
vision.
f.
CHECK-Pulse amplitude deflection
on the test
oscilloscope should decrease
to between 25 volts to 35
volts
less
than the amplitude in
step d.
g.
Disconnect the
test oscilloscope 10X probe from the
7623 (R7623)
and reduce
the INTENSITY setting to a
normal
intensity.
Position the
trace within the graticule
area.
5.
Adjust
Astigmatism
a.
Set
the 7B53A for auto, internal triggering at a sweep
rate
of one
millisecond/division.
b.
Set
the mainframe
standardizer calibration fixture
Test switch to
VERT or HORIZ AUX IN.
c. Connect the
4 V Calibrator
pin-jack to the Aux In
connector
of the calibration fixture with the BNC
to
pin-jack
cable.
d.
Set
the calibration fixture Position control for a
centered
display, and the Amplitude control for about two
divisions of vertical deflection.
e.
CHECK-CRT display is well defined.
f. ADJUST—FOCUS
control
and Astigmatism adjust
ment R1045 (see Fig. 2-2) to obtain best display definition.
g.
Disconnect the cable.
6. Adjust
Trace
Rotation
a.
Set the
INTENSITY control to
midrange.
b.
Move
the trace to the center horizontal line with the
mainframe
standardizer Position control.
c.
CHECK-Trace
aligns with the center
horizontal line
within 0.1 division.
d.
ADJUST—Trace
Rotation adjustment
R1181
(see
Fig.
2-2)
to
align
the trace with the
center horizontal line.
7.
Adjust
Y-Axis
Alignment
a.
Inter-change
the
7B53A and mainframe standardizer
plug-in
units.
b.
Move
the trace to the center vertical line with the
mainframe
standardizer Position control.
c.
CHECK-Trace
aligns with the center vertical line
within
0.1 division.
d.
ADJUST-Y-Axis adjustment
R1190
(see Fig. 2-2) to
align the trace
with the center vertical line.
8.
Adjust
Geometry
a.
Remove
the
mainframe standardizer and install
the
7B53A
in
the horizontal
compartment. Replace the main
frame
standardizer in the left vertical compartment.
b.
Set
the VERT MODE switch to
LEFT.
c. Connect
the marker output of
the time-mark gen
erator
to the Aux In connector of the calibration fixture
with
an
18-inch
50-ohm BNC cable.
d.
Connect
the trigger output of the time-mark gen
erator
to the external trigger input connector of the 7B53A
with a 42-inch
50-ohm BNC cable.
e.
Set
the time-mark generator for one-millisecond
markers and one-millisecond triggers.
f. Set the
calibration fixture Test switch to VERT or
HORIZ
AUX
IN and
the Amplitude Step or Aux
control
fully clockwise.
g. Set the
7B53A for auto
triggering from the external
source
at a
sweep rate of 0.5 millisecond/division
(magnifier
off).
2-10
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 ...