Tektronix 5110, Instruction Manual

Page: 50 / 128

Mai rrtenance-5110
Cam Switch Lubrication
In most cases, factory lubrication should be adequate
for the
life of the instrument. However, if the switch has
been disassembled for replacement of switch sub-parts, a
lubrication
kit containing the necessary lubricating
materials and instructions is available through any
Tektronix Field Office. General Electric Versilube® is a
recommended silicone grease and should be applied
sparingly so that the lubricant does not get on the
contacts. Refer to Fig. 4-4 for lubrication instructions.
PERFORMANCE CHECK AND
ADJUSTMENT INTERVAL
To ensure accurate measurements, perform the Perfor­
mance Check procedure on this instrument after each
1000 hours of operation or every 6 months if used
infrequently. In addition, replacement of
components may
necessitate performing the Adjustment procedure to
calibrate the affected circuits. The Adjustment procedure
can also be helpful in localizing certain troubles in the
instrument.
In some cases, minor troubles may be
revealed or corrected by performing the Adjustment
procedure.
SEMICONDUCTOR CHECKS
Periodic checks of the semiconductors in this instru­
ment are not recommended. The best check of semicon­
ductor performance is actual operation in the instrument.
More details on checking semiconductor operation are
given under Troubleshooting.
TROUBLESHOOTING
The following information is provided to help
troubleshoot this instrument. Information contained in
other sections of this manual should be used along with
the following information to aid in locating a defective
component. An understanding of the circuit operation is
very helpful in locating troubles.
lubricant to the drum journals and
surface in the mounting bearings.
® Apply
mating
® Apply lubricant to the wear surface of the
index wheel.
® Apply luDricant 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.
Ensure that some lubricant is present at the
interface between the bearing and retainer clip.
(1481)1967-2
Fig. 4-4. Lubrication procedure for a typical cam switch.
TROUBLESHOOTING AIDS
Diagrams
Circuit diagrams are given on foldout pages in Section
7. The component number and electrical value of each
component in this instrument is shown on the diagrams.
Circuit-Board Illustrations
Circuit-board illustrations are shown on a foldout page
preceding the associated diagram. Each board-mounted
electrical component is identified by its circuit number, as
are interconnecting wires and connectors.
Wiring Color Code
Insulated wire and cable used in this instrument is
color-coded to facilitate circuit tracing.
Semiconductor Basing
Figure 4-5 illustrates the basing configurations for
semiconductors
that may appear in this instrument. Some
plastic-case transistors have lead configurations that do
not agree with those shown here. If a replacement
transistor is made by a different manufacturer than the
original, check the manufacturer's basing diagram. All
transistor sockets in this instrument are wired for the
standard basing used for metal-case transistors.
4-8
REV A JUL 1979