Tektronix 7613 User Manual

Maintenance —7613/R7613 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 7613 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 7613 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 7613. 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.
7613

Tektronix 7613 Specifications

General

Brand	Tektronix
Model	7613
Category	Test Equipment
Language	English