Section
4
—7623/R7623
Service
MAINTENANCE
This
section
of the manual contains maintenance infor
mation for
use in preventive maintenance, corrective
maintenance,
or
troubleshooting of
the 7623.
Panel
Removal
[
WARNING
I
Dangerous potentials
exist at several points through
out
this instrument. When
the instrument is operated
with
the covers removed, do
not touch exposed
connections
or components.
Some transistors
have
voltages
present on their cases. Disconnect
power
before cleaning the instrument or replacing parts.
Cabinet
Model. The side
panels of the 7623 are held in
place
by
spring-action of the panels themselves. To remove
the
panels,
push the panel
toward the top of the instrument
until
the bottom of the
panel is clear
of the slot along the
bottom
rail
of the instrument. Then, pull the
panel out at
the
bottom and lift away from the instrument. The bottom
panel is
held in
place with eight screws. The panels protect
this
instrument from dust in the interior, and also provide
protection to
personnel from
the
operating potentials
present. They
also reduce the EMI radiation from this
instrument
or EMI
interference to the display due to other
equipment.
Rack
Model.
The top cover is held in
place with six
screws. To
remove the cover, the screws need
only be
loosened slightly to slide the cover out of the
slots.
A
panel on the left side of the instrument, held in place
with
six screws,
allows access to the vertical
amplifier
circuit
board.
A cover
on the rear of the instrument, held in place with
four
screws,
allows access
to the power supply regulating
transistors.
It
also allows access
to
three of the five screws
holding the
regulating circuit board assembly in the
instrument.
Power-Unit
Removal
The
power
unit
can be slid out of the back of the 7623
to
gain access to
the Logic and Rectifier circuit boards and
for
power-unit maintenance. The power
unit can be left
connected
to
the
rest of the instrument so that it can
be
operated
in
this position
for troubleshooting. To remove
the
power unit,
use the following procedure:
1.
Remove
the side panels (top panel for
R7623).
2. Remove
the six screws which secure the power unit
to
the
sides of the instrument (see Fig. 4-1 for locations of
screws on
R7623).
3. Slide the power unit out of the rear of
the instrument
until
it can be
set down on the work surface (guide the
interconnecting
cables
so they do not
catch on
other parts
of the instrument).
PREVENTIVE
MAINTENANCE
General
Preventive
maintenance consists of cleaning, visual
inspection,
lubrication,
etc. Preventive
maintenance per
formed
on a regular basis may prevent instrument break
down
and will
improve the reliability of this instrument.
The
severity
of the
environment to which the 7623 is
subjected
determines the
frequency of maintenance. A
convenient time
to perform preventive
maintenance is
preceding recalibration
of the
instrument.
Cleaning
The 7623
should be cleaned as often as operating
conditions
require. Accumulation
of dirt in the instrument
can cause
overheating and component breakdown. Dirt on
components
acts
as an insulating blanket and
prevents
efficient
heat
dissipation. It
also provides an electrical
conduction
path
which may result in instrument failure.
The
side panels provide protection against dust in the
interior of the instrument.
Operation without the panels in
place necessitates more frequent cleaning.
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CAUTION
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Avoid
the use of
chemical cleaning agents which
might
damage the plastics used in
this
instrument.
Avoid chemicals
which contain benzene, toluene,
xylene,
acetone, or
similar
solvents.
Exterior.
Loose dust
accumulated on the outside of the
7623
can be removed
with a soft cloth or small brush. The
brush
is particularly useful for dislodging dirt on and
around the
front-panel controls. Dirt which remainscan be
removed with
a soft cloth
dampened in a mild detergent
and
water
solution.
Abrasive
cleaners should not be used.
4-1
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 ...