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4
-4
ROUTINE
MAINTENANCE
Cleaning
Lubricati
on
Routine maintenance
of
the
cape transport mechanism consists pri-
marily
of
periodic cleaning and lubrication.
Cleanliness
of
all
parts
of
the tape drive mechanism
is
required
for
con-
sistent
optimum
performance. Mose tape manufacturers lubricate the
ir
tapes; chis lubricant will gradually form a coating
on
the head assembly
and
the
idler wheels
and
may cause loss
of
positive drive at the capstan.
Therefore, periodic cleaning
of
both the head assembly and
al
l
parts
of
the
tape drive mechanism
is
particularly important.
The
recommended
agent
for cleaning
Ampex
Head
Assemblies is a mixture
of
Xylene
and
0.1% Aerosol.
This
agent
is available in 2
oz.
bottles.
(Ampex
Catalog
No.
FP-7.)
To
clean any head assembly simply wind a clean, lintless
cloth on a swab-stick
and
moisten with chis mixture. Swab
the
heads
periodically
to
remove all dirr and oxide which may have accumulated
f~om
the
tape. Clean all pares except the head assembly with a clean,
lmtless cloth moistened with denatured alcohol.
CAUTION
Do
noc
use any ocher solv
ents
as there are some which may damage the
adhesive used
to
hold the head laminations together.
The
recommended standard lubricant for the four places which re-
quire periodic lubrication
(motor
and capstan)
is
Caloil
No
. OC-11.
This
lubricant is available from
AMPEX
as Stock
No.
T0-9
( ½ oz.
oiler)
or
FP-5
( 4 oz.)
NOTE
The
proper
lubricant is available from
AMPEX
as Stock
No.
T0
-9
(
Vi
oz.
oiler)
or
FP
-5
(4
oz.).
The
upper
and l
ower
bearings
of
the drive mocor should be lubricated
after every
500
h
ours
of
operation.
The
upper
oil hole
of
the motor
is
accessible through a hole in the tape transport
gri
ll
e slighcly above
and
to
the
left
of
the takeup turntable. For access to the lower oil hole, lo-
cated in the side
of
rhe moror end bell, remove rhe tape transport from
the case ( See Fig.
4-2).
Four
or
five drops
of
one
of
the recommended lubricants is sufficient.
Care should be taken
to
avoid over-oiling
or
sp
ill
s.
Any such excess
should
be
wiped away
with
solvent.
The
capstan may require oiling
about
once for every four oilings
of
rhe
drive motor.
For
access
co
the
upper
bearing, the capstan idler muse
first
be
removed ( See Fig.
4-2)
. Remove the rubber cap
on
the idler.
Remove the hairpin retainer
and
lift
the
idler off its shaft, caking care
not
to
lose the washers associated
with
ir.
The
aluminum
plug-boccom
over the capstan shaft may
now
be pried off and the felt washer beneath
it
removed
co
expose the
upper
capstan bearing.
Use
as
much
of
one
of
the
recommended lubricants as the bearing will accept,
wipe
away
any excess,
and
reassemble.
CAUTION
Do
not
oil
the
felt washer which serves only as a dust protector
and
to
keep
oil from working its way
up
the capstan.
For access
to
the
lower bearing, remove the tape transport from the case.
The
oil hole
is
located in the bearing housi
ng
as shown in Fig. 4-2.
Ure exactly f ottr drop1
of
oil
--
no
more.
Do
not
o
il
any ocher
parts
of
the
tape
transport mechanism. All
other
bearings and moving pares are lubricated for life.
le may be said
in
ge
neral, chat most of the difficulcies char will normally
be
encou
nt
ered
in
the
Model 601 tape transport mecha
ni
sm will
be
traceable
to
contamination
of
belcs, pulleys, bearings, a
nd
ocher friction
surfaces,
whether
due
to
carelessness in routine lubrication,
or
to
rhe
gradua
l accumulation of d
irt
a
nd
other foreign
ma
terial
to
be
expected
over a reasonable l
ength
of time. Correction
of
these difficulties will
usually be a macrer
of
careful disassembly and cleaning, rather
than
re-
adjustment of
the
mechanism.
Th
e normal torques ( and hence, rape
tensi
on)
in
this mechanism are,
in
fact, fixed within strict design speci-
fi
cations, and are noc adjustabl
e.
The
measurement
of
these
to
rques will
frequently provide a
rap
id means for isolati
ng
the source
of
mechanical
troubles.
~
~
~
,,...
_ I
3/4
OZ
-IN
,
2-3
112
OZ~IN
.
T
AKE
U"'
s-~
1
111
.
HOLNACK
114
-~ • l
fl
.
NO
TES
HOLOBACK
3/ 4 - •
,,.
oz-
1N
TAK[U"'
5 - 7
oz.-1N
,
I.
IF
ftEEl
HUB
DIAMETER
IS
•. AAOER Oft SMALLEIIII
THAM
2 UICHIES,
111-
ULTlflLY
SPl'tl
N
(J
!SCALE
lltEAO\frtO ev
HUS
ftADIUS
TO
O
BTA
IN oz.- ,.
JtfAD
INI .
2:
P'UlL
SCALE: W
ITH
STEADY
MOTION WHEN
MEA
SUftl
NG
HO\.DIACK
T!NSIGJU'
.
ALLO
W
SCALE
TO
MOVE
IN TOWARD
REEL
WH
E N M
EAS~.umu•
TAICIEUI' T
IJitSION.S
.
TAKE A
LL
READINGS
WHI
LE
SC
A
LE
IS
IN
M
OTION.
Fig.
4-3. Tape Tension Measurements
Mecha
nical
Troubleshooting
4-5
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