Maintenance—
7623/R7623
Service
CRT.
Clean the plastic light filter,
faceplate protector,
and
the
CRT
face with a soft, lint-free cloth dampened with
denatured
alcohol.
The
optional
CRT mesh filter can
be cleaned
in the
following manner :
1.
Hold
the
mesh filter in a vertical position and brush
lightly
with a soft No. 7 water-color brush to remove light
coatings
of dust or
lint.
2.
Greasy
residues or
dried-on
dirt can be removed with
a
solution of warm water and a neutral-pH liquid detergent.
Use the brush to lightly scrub the filter.
3.
Rinse
the filter thoroughly
in
clean water and allow
to
air dry.
4.
If
any lint
or dirt remains, use clean low-pressure air
to remove
it. Do
not use tweezers or other hard cleaning
tools on the filter,
as the special finish may be damaged.
5. When not in use.
store the mesh filter in
a lint-free,
dust-proof
container
such
as
a plastic bag.
Interior.
Dust
in the interior of this instrument should
be
removed occasionally due to its electrical conductivity
under high-humidity conditions. The
best way to clean the
interior is
to
blow off the accumulated dust with dry,
low-pressure
air. Remove any dirt
which remains with a
soft
brush
or a cloth dampened with a mild detergent and water
solution. A
cotton-tipped applicator
is useful
for cleaning in
narrow
spaces or for cleaning ceramic terminal strips and
circuit
boards.
The
high-voltage circuits,
particularly parts located
in
the
high-voltage compartment and the area surrounding the
post-deflection
anode lead, should receive special attention.
Excessive
dirt in these areas may cause
high-voltage arcing
and result
in improper instrument operation.
Air
Filter
(For
Rackmount Versions
only).
The
air
filter
should
be
visually
checked every few weeks and cleaned or
replaced
if
dirty.
More
frequent inspections are required
under
severe
operating conditions.
If the
filter is to be re
placed,
order
new filters from your local
Tektronix Field
Office
or representative;
order by
Tektronix Part No.
378-0041-01.
The following
procedure is suggested for
cleaning
the filter.
1.
Remove
the filter
by pulling it out of the retaining
frame
on the
rear
panel. Be careful not to drop any of the
accumulated
dirt
into the instrument.
2. Flush the
loose dirt from the filter with a stream
of
hot
water.
3.
Place
the filter
in a solution of mild detergent and hot
water
and let soak for several minutes.
4.
Squeeze the
filter
to wash out any dirt
which
remains.
5.
Rinse the filter
in clean water and let dry.
6. Coat
the dry filter with an air-filter coating (available
from air
conditioner suppliers
or order Tektronix Part No.
006-0580-00).
7.
Let the filter
thoroughly dry.
8. Re-install
the filter in the retaining frame.
Lubrication
The
reliability of
potentiometers,
switches, and
other
moving parts
can
be maintained if they are kept properly
lubricated.
However, over-lubrication is as detrimental
as
too
little
lubrication. A lubrication kit containing necessary
lubricants
and instructions
is available from Tektronix, Inc.
Order
Part No. 003-0342-01.
Visual
Inspection
The 7623
should
be inspected occasionally for such
defects
as broken connections, improperly seated semi
conductors,
damaged or improperly installed circuit boards,
and
heat-damaged parts. The
corrective procedure for most
visible
defects is obvious; however,
particular care must be
taken
if heat-damaged
components are found.
Overheating
usually
indicates other trouble in the instrument; therefore,
it
is
important that the cause of overheating be corrected to
prevent
recurrence
of the
damage.
Semiconductor
Checks
Periodic
checks
of the
semiconductors in the 7623 are
not
recommended. The
best check of semiconductor
performance
is actual operation in
the instrument. More
details
on checking semiconductor
operation are given
under troubleshooting.
Recalibration
To
assure
accurate measurements, check the calibration
of
this
instrument after each 1000 hours of operation or
every
six months if used infrequently. In addition, replace
ment
of components may
necessitate recalibration
of the
affected circuits.
The
calibration procedure can
also be
helpful
in localizing certain troubles in the instrument. In
some cases, minor troubles may
be revealed and/or
corrected by recalibration.
TROUBLESHOOTING
Introduction
The following information
is provided to facilitate
troubleshooting
of
the 7623. Information contained in
other
sections of this manual should be used along with the
following
information to aid in
locating
the defective
component.
An
understanding of
the
circuit operation is
very
helpful
in
locating troubles, particularly where
inte
grated circuits
are used. See
the Circuit Description section
for complete information.
4-2
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 ...