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SECTION IV
MAl NTENANCE INSTRUCTIONS
4.1 GENERAL
Kennedy Company tape transports are highly reliable
precision instruments which will provide. years of
trouble-free performance whenproperly
maintained~
A planned program of routine inspection and main-
tenance is essential for optimum performance and
reliability. The units require very few adjustments
and these should not be performed unless there is
strong reason to believe they are required. All elec-
trical adjustments are preset at the factory and should
not require readjustment except after long periods of
use.
4.2 PREVENTIVE MAINTENANCE
To assure continuing trouble-free operation a pre-
ventive maintenance schedule should be kept. The
items involved are few and simple but very impor-
tant to proper tape transport operation.
The fre-
quency of performance will vary somewhat with the
environment and degree of use of the transport so a
rigid schedule applying to all machines is difficult
to
define.
The periods recommended below apply to
units in constant operation in ordinary environments.
They should be modified
if
experience shows other
periods are more suitable.
4.2.1 DAILY CHECK
Visually check the machine for cleanliness and ob-
vious misadjustment.
If
items in the tape path show
evidence of dirt or oxide accumulation, clean thor-
oughly.
4.2.2 CLEANING
All items in the tape path must be kept scrupulously
clean. This is particularly true of the head •. When
cleaning heads, it is important to be thorough yet
gentle and to avoid certain dangerous practices.
4.2.2.1 Head Cleaning
Oxide or dirt accumulations on the head surfaces are
removed using a mild organic solvent and a swab.
Q
tips are convenient for this use but must be used
with caution. Be sure the wooden portion does not
contact head surfaces.
4-1
An
ideal solvent is 1.1.1 trichlorothane contained in
the Kennedy K21 maintenance kit. However, others
such as isopropyl alcohol will do.
DO NOT USE - acetone or lacquer thinner
- aerosol spray cans
- rubbing alcohol
Do
not use an excess of any solvent, and be extremely
careful not to allow solvent to penetrate the ball
bearings of the capstan motor, since it will destroy
their lubrication.
4.2.2.2 Other Cleaning
Use a vacuum cleaner to remove accumulations of
dust inside the dust cover or elsewhere in the unit.
Compressed air may be used if caution is exercised
to avoid blowing dirt into bearings.
4.3 ROUTINE ADJUSTMENT
There are no routine adjustments. Need for adjust-
ment becomes manifest when malfunction occurs.
Under normal circumstances adjustment will be more
likely
to
cause trouble than to prevent it.
4.4 LUBRICATION
No bearing lubrication is required. All bearings are
lubricated for life and introduction of oil may destroy
their lubrication.
4.5
HEAD WEAR
Head wear is generally signaled by an increase in
error rate. Confirmation is a sizable increase in
output voltage from the read head as measured at the
read preamplifier. When the head becomes worn it
must be replaced. Head replacement is described in
paragraph
4.
9. 5.
Worn heads usually can be resurfaced at least once
if returned
to
the factory. This is more economical
than replacement with a new head. Consult Section V
for details of head return.
4.6 PERIODIC INSPECTION
Every two months, it is advisable
to
make a more
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