Tektronix 5441 Instruction Manual page 89

chemical cleaning gents that leave a film or that might dam-
age plastic parts. Do not use cotton swabs or similar appli-
cators to apply cleaning agents, as they tend to snag and
leave strands of cotton on switch contacts. Should it be-
come necessary to remove a switch for replacement or
cleaning, refer to Component Removal and Replacement in
this section.
VISUAL INSPECTION
This instrument should be inspected occasionally for
such defects as broken connections, improperly seated
semiconductors, damaged circuit boards, and heat-dam-
aged parts.
The corrective procedure for most visible defects is obvi-
ous; however, particular care must be taken if heat-
damaged components are found. Overheating usually indi-
cates other trouble in the instrument; therefore, it is impor-
tant that the cause of overheating be corrected to prevent
recurrence of the damage.
LUBRICATION
Generally, there are no components in this instrument
that require a regular lubrication program during the life of
the instrument.
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 lubrica-
tion kit containing the necessary lubricating materials and
instructions is available through any Tektronix Field Office.
General Electric Versilube* silicone grease should be ap-
plied sparingly so that the lubricant does not get on the
contacts. Refer to Fig. 5-1 for lubrication instructions.
SEMICONDUCTOR CHECKS
Periodic checks of the semiconductors in this instrument
are not recommended. The best check of semiconductor
performance is actual operation in the instrument. More de-
tails on checking semiconductor operation are given under
Troubleshooting.
a
Apply lubricant to the drum journals and
mating surface in the mounting bearings.
@
Apply lubricant to the wear surface of the
index wheel.
@
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
i s
replaced.
@
Ensure that some lubricant i s present
a t
the
interface between the bearing and retainer clip.
(1481)196 ' - 2
Fig. 5-1.
Lubrication procedure for a typical cam switch.
ADJUSTMENT AFTER REPAIR
After any electrical component has been replaced, the
adjustment of that particular circuit should be checked, as
well as the adjustment of other closely related circuits. The
Performance Check and Adjustment procedure in this man-
ual provides a quick and convenient means of checking in-
strument operation. In some cases, minor troubles may be
revealed or corrected by adjustment.
REV MAY 1982