Calibration—7623/R7623
Service
l. CHECK/ADJUST- Check
High Speed Mesh for
13
volts.
Adjust R1393 High Speed Mesh adjustment
for 13
volts.
m.
Press the
single sweep reset on the horizontal
time-base
plug-in unit.
n.
Remove
the transistor Q1
788.
o.
Press
the
ERASE button.
p.
CHECK
-Storage
test points (see Fig. 2-10). Table
2-8
lists the
storage test points and their tolerances.
Connect
the test oscilloscope 10X probe to each test point,
in turn, setting
the deflection factor to 1.0 V, 2.0 V, and
5.0 V
as
required.
TABLE
2-8
Test
Points
Tolerance
High Speed Mesh
+120
V
to
+130 V
ce
3
+81 V
to +88 V
ce
2
+81 V
to +88 V
CE,
+81
V to +88 V
FGA
+86 V
to +93 V
FGK
Less than 500 mV
q.
CHECK/ADJUST-Check
Collector
for 120 volts.
Adjust R1439 collector adjustment for +120 volts.
r.
Replace transistor Qi 788.
45.
Check—
Erase
and
Fast Transfer Pulses
a.
Connect
10X probe from test oscilloscope to
the
Bi-Stable
test
point.
b.
Press
the
ERASE button.
c.
CHECK—
Test
oscilloscope display for erase and
transfer waveforms. See
Fig. 2-11A
and B for
typical
waveforms.
d. CHECK-Transfer
pulse amplitude is greater than
+540 volts above
ground.
e.
CHECK Erase
pulse amplitude
is approximately 320
volts
above
ground.
f.
CHECK -That
erase ramp is less than 375 ms long,
and
that the ramp starts at zero volt level or below.
46.
Check—
High
Speed
Mesh Pump
Pulses
a. Set
the test
oscilloscope to 5.0 V/division
vertical
deflection (50 V/divison
at probe tip), and a sweep rate of
1.0
microsecond.
b.
Connect
the test probe
to the High Speed Mesh test
point.
c.
Press
ERASE
button (do not transfer or store a
display).
d.
CHECK/ADJUST-Check
that the pump pulses
are
2.0
µs
wide (top of pulse
only). Adjust pump pulse width
R1559 for
2.0 µs
at the
top of the pulse.
47.
Check
Pump
Pulse
Frequency
a. Set
test oscilloscope sweep rate to
5.0 millisecond/
division.
b.
CHECK—For
five
pump pulses in eight div1.2
divisions
(100
Hertz ±15%).
48.
Check/Adjust
STORAGE
LEVEL
Range
a.
Set STORAGE
LEVEL control fully clockwise.
b. Set AUTO VIEWTIME fully
clockwise
and press the
AUTO
ERASE button.
c. Set horizontal time base plug-in unit for
0.1 micro
second.
d.
CHECK/ADJUST—Check that only
the center of the
storage
screen saturates during the store time.
Adjust
STORAGE
LEVEL range adjustment
R.1440 so that only
the center screen
saturates.
2-30
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 ...