Corrective Maintenance; Obtaining Replacement Parts; Soldering Techniques - Tektronix 213 DMM Instruction Manual

Maintenance-213 Service
PUSHBUTTON SWITCHES. These switches are lubricated
prior to leaving the factory and should not require further
lubrication. However, if they become electrically noisy,
cleaning and lubricating with Electronic Chemical Corpora-
tion No Noise <8 may resolve the problem.
CAM SWITCHES. In most cases the factory lubrication of
these switches should be adequate for the life of the instru-
ment. If the switch has been disassembled for replacement
® ·1·
of switch sub-parts, General Electric Versilube s1 icon
grease may be used and applied sparingly so that the lubri-
cant does not get on the contacts. Refer to Figure 4-1 for
the following lubrication instructions (instruction numbers
are also lubrication point locators on the figure):
1. Apply lubricant to the drum journals and mating surface
in the mounting bearings.
2. Apply lubricant to the wear surface of the index wheel.
3. Apply lubricant to the index roller and roller guide in
the front bearing. A thin film should be applied to the
inner face of the detent springs if more than one spring is
replaced.
4. Ensure that some lubricant is present at the interface be-
tween the bearing and retainer clip.
CORRECTIVE MAINTENANCE
Corrective maintenance consists of component replacement
and instrument repair. Special techniques that are required
to replace components in this instrument are given here.
Figure 4-1. Typical cam switch lubrication points.
4-2
Obtaining Replacement Parts
STANDARD PARTS. All electrical and mechanical part
replacements for the 213 can be obtained through your
local Tektronix Field Office or representative. However,
many of the standard electronic components can be obtained
locally in less time than is required to order them from
Tektronix, Inc. Before purchasing or ordering replacement
parts, check the parts I ist for value, tolerance, rating, and
description.
NOTE
Physical size and shape of a component may
affect instrument performance, particularly at
high frequencies. Always use direct-replacement
components, unless it is known that a substitute
will not degrade instrument performance.
SPECIAL PARTS. In addition to the standard electronic
components, some special components are used in the 213.
These components are manufactured or selected by Tek-
tronix, Inc. to meet specific performance requirements, or
are manufactured for Tektronix, Inc. in accordance with
our specifications. These special components are indicated
in the parts list by the Tektronix, Inc. manufacturer code
(80009) listed in the Mfr Code column. Most of the
mechanical parts used in this instrument, except miscellaneous
hardware, have been manufactured by Tektronix, Inc.
Order all special parts directly from your local Tektronix
Field Office or representative.
ORDERING PARTS. When ordering replacement parts
from Tektronix, Inc., it is imperative that all of the follow-
ing information be included in the order to ensure receiving
the proper parts.
1. l,nstrument type (include mod or option numbers).
2. Instrument serial number.
3. The complete description line from the parts list (Ckt
No., Tektronix Part No., Serial/Model No., etc).
Soldering Techniques
WARNING
I
Before soldering, turn the instrument off, dis-
connect it from the power line, and allow
approximately 3 minutes for the filter capacitors
in the power supply to discharge. If the instrument
REV APR 1982