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Section 4-213 Service
MAINTENANCE
This section of
the
manual contains maintenance information for use in preventive maintenance, corrective maintenance, or
troubleshooting of the 213. It also includes repackaging
information.
TEKTRONIX FIELD SERVICE
Tektronix, Inc. maintains repair and recalibration facilities
at its local Field Service Centers and the Factory Service
Center. For further information or assistance, contact your
local Tektronix Field Office or representative.
PREVENTIVE MAINTENANCE
Preventive maintenance consists of recalibration, cleaning,
visual inspection, and lubrication. Preventive maintenance,
performed on a regular basis, can prevent instrument break-
down and will improve the reliability of this instrument.
The severity of the environment to which the instrument is
subjected will determine the frequency of maintenance. A
convenient time to perform preventive maintenance is
preceding recalibration of the instrument.
Recalibration
To insure accurate measurements, check the calibration of
this instrument after each 1000 hours of operation or every
6 months if used infrequently. In addition, replacement of
components may necessitate recalibration of the affected
circuits. The calibration procedure can also be helpful in
localizing c~rtain troubles in the
instrument.
In some cases,
minor troubles may be revealed or corrected by recalibration.
Cleaning
The 213 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 cabinet provides
protection
against
dust
in
the
interior
of
the instrument and
operation without
them necessitates more frequent
cleaning.
@
E3
A
void
the use
of
chemical cleaning agents which
might damage the plastics used in this instrument.
In
particular, avoid chemicals
which
contain
benzene, toluene, xylene, acetone or
similar
solvents. Recommended
cleaning agents are
isopropyl alcohol (
lsopropanol)
or ethyl alcohol
(Fotocol or Ethanol).
EXTERIOR. Loose dust accumulated on the outside of
the instrument can be
removed
with a soft cloth or small
brush. The brush is particularly useful for dislodging dirt
on and around the controls. Dirt that remains can be re-
moved with a soft cloth dampened in a mild detergent and
water solution. Abrasive cleaners should not be used.
INTERIOR. Dust in the interior of the instrument should
be removed occasionally to prevent undesirable electrical
conduction. Clean the interior with a dry, low-velocity
stream of air. If this method doesn't remove all the loose
dust, or if hard dirt is present, the boards will have to be
disassembled for further cleaning. A soft bristle brush or a
cotton tipped applicator is useful for cleaning in narrow
spaces or for cleaning the more delicate components.
If the boards are disassembled for thorough cleaning, the
high-voltage circuits, particularly parts located in the high-
voltage multiplier, and the thick film input attenuator
resistors should receive special attention. Excessive dirt or
dust in these areas may cause high-voltage arcing, or signal-
path shunting, which would result in improper instrument
operation.
CATHODE-RAY TUBE (CRT). Clean the plastic light
filter and the crt face with a soft, lint-free cloth dampened
with denatured
alcohol.
Visual Inspection
The 213 should be inspected occasionally for
such
defects
as
broken connections,
improperly seated semiconductors,
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-damaqed
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.
Lubrication
Generally, there are no components in the 213 that will re-
quire lubrication during the life of the instrument.
4-1
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