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Maintenance— 2236 Service
9. Use a soldering iron that is connected to earth
10. Use
only
approved
antistatic,
vacuum-type
ground.
desoldering tools for component removal.
PREVENTIVE MAINTENANCE
INTRODUCTION
Preventive maintenance consists of cleaning, visual
inspection,
lubrication,
and
checking
instrument
performance. When accomplished regularly, it may prevent
instrument malfunction and enhance instrument reliability.
The severity of the environment in which the instrument is
used determines the required frequency of maintenance. An
appropriate time to accomplish preventive maintenance is
just before instrument adjustment.
GENERAL CARE
The cabinet minimizes accumulation of dust inside the
instrument and should normally be in place when operating
the oscilloscope. The optional front-panel cover provides
both dust and damage protection for the front panel and crt
face, and it should be in place whenever the instrument is
stored or is being transported.
INSPECTION AND CLEANING
The instrument should be visually inspected and 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, preventing efficient heat dissipation. It also
provides an electrical conduction path that could result in
instrument failure, especially under high-humidity conditions.
Avoid the use of chemical cleaning agents which
might damage the plastics used in this instrument.
Use a nonresidue-type cleaner, preferably isopropyl
alcohol, denatured ethyl alcohol, or a solution of 5%
mild detergent with 95% water. Before using any
other type of cleaner, consult your Tektronix Service
Center or representative.
Exterior
INSPECTION. Inspect the external portion of the instru
ment for damage, wear, and missing parts; use Table 6-2 as
a guide. Instruments that appear to have been dropped or
otherwise abused should be checked thoroughly to verify
correct operation and performance. Deficiencies found that
could cause personal injury or could lead to further damage
to the instrument should be repaired immediately.
To prevent getting moisture inside the instrument dur
ing external cleaning, use only enough liquid to
dampen the cloth or applicator.
CLEANING. Loose dust on the outside of the instrument
can be removed with a soft cloth or small soft-bristle brush.
The brush is particularly useful for dislodging dirt on and
around the controls and connectors. Dirt that remains can
be removed with a soft cloth dampened in a mild detergent-
and-water solution. Do not use abrasive cleaners. Clean the
light filter and the crt face with a soft lint-free cloth damp
ened with either denatured alcohol or a mild detergent-and-
water solution.
Interior
To gain access to internal portions of the instrument for
inspection and cleaning, refer to the “Removal and Replace
ment Instructions” in the “Corrective Maintenance” part of
this section.
INSPECTION. Inspect the internal portions of the instru
ment for damage and wear, using Table 6-3 as a guide.
Deficiencies found should be repaired immediately. The cor
rective procedure for most visible defects is obvious; how
ever, 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.
6-2
Содержание 2236
Страница 10: ...2236 Service viii The 2236 Oscilloscope ...
Страница 28: ...Specification 2236 Service 1 18 ADD JAN 1985 Figure 1 2 Physical dimensions of the 2236 Oscilloscope ...
Страница 74: ...Theory of Operation 2236 Service 3 30 ...
Страница 75: ...Theory of Operation 2236 Service Figure 3 13 Typical waveforms for the Delta Time function with Valt HI 3 31 ...
Страница 102: ...Performance Check Procedure 2236 Service 4 21 Figure 4 1 Test setup for DMM common mode check ...
Страница 240: ...2236 Service CTM INTERFACE SIGNALS F ig u re 9 4 O s c illo s c o p e b a sic b lo c k diag ram 4294 46 ...
Страница 241: ... VERT DEFL 2236 Service 4 2 0 6 3 5 4 2 0 4 4 7 F ig u re 9 5 O scillo sco p e d e ta ile d b lo c k diag ram ...
Страница 242: ...2236 Service 4204 34 Figure 9 6 CTM basic block diagram ...
Страница 243: ...DMM POWER S U P P LIE S 2236 Service F ig u re 9 7 C T M d e ta ile d b lo c k diag ram ...
Страница 253: ...A10 COUNTER TIMER MULTIMETER BOARD F ig u re 9 8 C irc u it b o a rd lo c a tio n Illu s tra tio n ...
Страница 254: ...S I 0 O I 5 1 S O i 4204 21 C IR C U IT BOARD INTERCONNECTIONS ...
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