Tektronix 1L30, Instruction Manual

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Change information, if any, affecting this section will be found at the
rear of the manual.
Introduction
Lubrication
This section of the manual pertains to the maintenance
and troubleshooting of the Type 1L30. The first portion of
the section describes some general preventive measures to
help minimize major problems. This is followed with some
corrective maintenance information and information on or­
dering parts or components. The last and major portion
of the section describes the removal and replacement of
the sub-assemblies and their components, and some gen­
eral troubleshooting information pertinent to the Type 1L30.
Trouble symptoms and possible causes are not listed for
this instrument because all circuits are interrelated. Listed
causes for various troubles could cause confusion.
PREVENTIVE M AINTENANCE
General
Preventive maintenance consists of cleaning, visual in­
spection, lubrication, and if needed, recalibration. Pre­
ventive maintenance is generally more economical than
corrective maintenance, since it can usually be done at a
time convenient to the user. The preventive maintenance
schedule established for the instrument should be based on
the ammount of use and the environment in which the in­
strument is used.
Cleaning
Clean the instrument often enough to prevent accumula­
tion of. dirt. Dirt on the .components acts as a thermal in­
sulating' blanket (preventing efficient heat dissipation) and
may provide electrical conducting paths.
Clean the instrument by loosening the accumulated dust
with a dry, soft paint brush. Remove the loosened dirt by
vacuum an d /o r dry low pressure compressed air (high
velocity air can damage certain components.) Hardened
dirt and grease may be removed with a cotton-tipped
swab or a soft cloth dampened with water and a mild
detergent solution (such as Keiite or Spray White). Abra­
sive cieane/s should not.be used.
C A U T IO N
Do not p e rm it.w a te r to get inside controls or shaft .
bushings. Avoid the use o f chemical cleaning
agents which might d a m a g e the plastics used in
this instrument. Some chemicals to avoid are b en ­
zene, toluene, xylene, acetone or similar com ­
pounds.
The life of potentiometers and selector switches is in­
creased if these devices are properly lubricated. Use a
cleaning type lubricant (such as Cramoline) on shaft bush­
ings and switch contacts. Lubricate the switch detents with
a heavier grease (Beacon grease No. 325 or equivalent).
Do not over-lubricate. The necessary materials and instruc­
tions for proper lubrication of Tektronix instruments are con­
tained in a component lubrication kit (Part No. 003-0342-00)
which may be ordered from Tektronix, Inc.
The dial and tuning assembly should be lubricated peri­
odically. This is normally every 500 hours; however, if the
tuning shaft tends to bind or drag it may be due to im-'
proper lubrication.
The gears should be lubricated with a high quality lubri­
cant such as COSMOLUBE No. 102, manufactured by E. F.
Houghton and Co. The bearing surfaces and drive shafts
should be oiled with a light weight oil, such as Hoppes
lubricating oil or Pfaff sewing machine oil.
Lay the instrument on its side. Use a syringe or hypo­
dermic oiler (Tektronix Part No. 003-0280-00) and apply no
more than one drop to each point.
Visual Inspection
After a thorough cleaning, the instrument should be care­
fully inspected for such defects as poor connections, dam ­
aged parts and improperly seated transistors. The remedy
for most visible defects is obvious; however, if heat-dam­
aged parts are discovered, determine the cause of over­
heating before the damaged parts are replaced; otherwise,
the damage may be repeated.
Transistor Checks
Periodic preventive maintenance checks consisting of re­
moving transistors from the instrument and testing them in
a tester, are not recommended. The circuits within the in­
strument provide the only satisfactory check on transistor
performance. Defective transistors are usually detected dur­
ing recalibration of the instrument.
Performance Checks and Recalibration
To insure accurate measurements, the instrument per­
formance should be checked after each 500 hours of opera-
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