Tektronix 434 User Manual

Maintenance—434
A vo id the use o f chem ical cleaning agents which
m ight damage the plastics used in this instrum ent.
A vo id chemicals which contain benzene, toluene,
xylene, acetone or sim ilar solvents.
Exterior. Loose dust accumulated on the outside of the
434 can be removed w ith a soft cloth or small paint brush.
The paint brush is particularly useful fo r dislodging d irt on
and around the front-panel controls. D irt w hich remains
can be removed w ith a soft cloth dampened in a m ild deter
gent and water solution. Abrasive cleaners should not be
used.
CRT. Clean the blue plastic light filte r and the CRT face
w ith a soft, lint-free cloth dampened w ith denatured
alcohol or a m ild detergent and water solution. The
optional CRT mesh filter can be cleaned in the follow ing
manner.
1. Hold the filte r in a vertical position and brush lig htly
w ith a soft No. 7 w atercolor brush to remove light coatings
of dust and lint.
2. Greasy residues or dried-on d irt can be removed w ith
a solution of warm water and a neutral pH liquid detergent.
Use the brush to lig htly scrub the filte r.
3. Rinse the filte r thoroughly in clean water and allow
to air dry.
4. If any lin t or d irt remains, use clean low-pressure air
to remove. Do n ot use tweezers or other hard cleaning tools
on the filte r, as the special finish may be damaged.
5. When not in use, store the mesh filte r in a lint-free
dust-proof cantainer such as a plastic bag.
Interior. Dust in the interior of the instrum ent should
be removed occasionally due to its electrical con ductivity
under high-hum idity conditions. The best way to clean the
interior is to blow o ff the accumulated dust w ith dry, low-
pressure air. Remove any d irt which remains w ith a soft
paint brush or a cloth dampened w ith a m ild detergent and
water solution. A cotton-tipped applicator is useful fo r
cleaning in narrow spaces or fo r cleaning circu it boards.
Lubrication
The reliability of potentiom eters, cam switches and
other moving parts can be maintained if they are kept
properly lubricated. Lubricate switch detents w ith a heavier
grease (e.g., Te ktron ix Part No. 006-0219-00). Potentio
meters w hich are not perm anently sealed should be lu b ri
cated w ith a lubricant which does not affect electrical
characteristics (e.g., T e ktro nix Part No. 006-0220-00). A
lubrication k it containing these lubricants and instructions
is available from Te ktro nix, Inc. Order T ektro nix Part No.
003-0342-01. The only portions of a cam switch tha t
require lubrication are the detents and the bushings. No
lubricant should be applied to the cams or contacts of a
cam switch. The correct lubricant for the detents and
bushings is available by ordering Tektro nix Part No.
006-1353-00.
Transistor Checks
Periodic checks of the transistors in the 434 are not
recommended. The best check o f transistor performance is
actual operation in the instrument. More details on
checking transistor operation are given under Trouble
shooting.
Recalibration
To assure accurate measurements, check the calibration
of this instrum ent after each 1000 hours of operation or
every six months if used infrequently. In addition, replace
ment of components may necessitate recalibration o f the
affected circuits. Complete calibration instructions are
given in the Calibration section.
The calibration procedure can also be helpful in local
izing certain troubles in the instrum ent. In some cases,
m inor troubles may be revealed and/or corrected by
recalibration.
TROUBLESHOO TING
Introduction
The follow ing inform ation is provided to facilitate
troubleshooting o f the 434. Inform ation contained in other
sections should be used along w ith the follow ing inform a
tion to aid in locating the defective com ponent. An under
standing of the circu it operation is very helpful in locating
troubles. See the C ircuit Description section fo r com plete
inform ation.
Troubleshooting Aids
Diagrams. Complete circu it diagrams are given on fold-
out pages in the Diagrams section. The component number
and electrical value of each com ponent in this instrum ent
are shown on the diagrams. Im portant voltages and wave
forms are also shown on the diagrams. The portions of the
circuit mounted on the circu it boards are enclosed w ith a
blue line.
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4-2

Tektronix 434 Specifications

General

Brand	Tektronix
Model	434
Category	Test Equipment
Language	English