Scully 280 Series - Page 20

TAPE TRANSPORT
and the LIOl plunger aduates the
microswitch SIll, which then connects the 40-
ollm
reslstor lnto tile LIUI solenoid eir_
cuil to reduce lIeating.
When the Start function is acti"ated, the
start relay K103 opens its contacls (8, 9), and
the solenoid LtOt is -energizc<l. The play-
back head hum shie ld is then positioned by a
return s(>ring On L 101. The tape lift solenoid
LI02 is not opCrali"e in this function.
In either the Fast FOf"'ard or Itewind
mode, LIOt is energizcC by KIO] (8, 9). Micro_
switch SI1I is actuated and tape lift solenoid
Lt02 is energized by ""nlacts 9, 10 of KIOI or
K102.
TABl.E l. OF AUTO:\tATIC
FEATURES
Function
T""
,=
Lifter
ShIeld
Power on, lr
ill
Helracted
port in ST ",'
Start and Rec
,,'
ill
In place
Fast Forward
Extended
Iktracled
Hewind
Edit
ill
Retracted
4.2.9. Manual Tape Lifter
On a Model 280 Recorder /Reprooucer
with a manually overated tape lifter, a micro_
switch S1l2 operated bIlhe tape lifter llnkagc
is used to lock out the Record mooc whilc the
tape is off the heads.
If, when record:ng, the tape lifter arm
IS used to lift the tape o!f the heads, the necord
function is not disabled . The STOI' pushbutton
must be actuated for tbis 10 occur.
4.3 HEAD ASSl::MBLY
The Model 280 Recorder / Reproducer
normally equipve:J with a complement of
three heads: erase, record, and playback. The
heads are lndh'idually mounted on lheir o",'n
bases. The erase and record head mounts are
idemical and the playback mount is similar but
pro"ides sh ie lding in the formofamu metalcan.
The record, playhack, and crase head mounts
contain the azimuth as "'ell as the zenith and
height adjustment screws.
All of !he heads are mounted on the top
plate (bridge) of the head assembly for easy
cessibility. lIeadrotationadjustments are made
by loosenin! the single screw mounting that fas-
tens 1 h e head tot h e bridge sufficiently to turn
the head .
The Scully 280 head assenlbly can be
changc<l
as a unit, Or ind;"idual heads can be
replaced. Bach head has plug - In connectors,
and has been pre-aJignc<l.
4.4. MAINTENANCE
4.4.1. Cleaning
Cle"" the CaPSlan, tape &uides, head
lace, and pressure roller e"ery t",·o or three
days, Or dally if the usage great . Use head
clc""ing solutton 10 dean the head face ""d all
other guide elemems. Isopropyl alcohol is ac_
ce(>table
lor this purpose. Use a clean swab
stick or de"", linttess doth on the head face.
4.4.2. Lubrication
Thereeommendedoil1o be used is Scul-
ly Lubricating Oil, Cat. 082000001 or a com-
mercial equivalent. This Scully oil is a"ailable
in 2 -OIlnce containers. Acce(>lable commercial
equ1\'alems are Texaco Capella 13 or DTE me_
d,um SAE 20.
4.4.3. Capstan and Capstan I dler Bearings
The capstan motor requires lubricalion
e"e,y 3 " "'!lb, or aIter 1,000 hours oluse,
whicheverooeurs lirst. To lu bricate, use atx>ut
10 drops 01 oil inthe hole through ... ·hich the cap-
stan shah protrudes. [f the trans(>Orl has be-en
rack mount.d, it is recommendc<llhat lhe cap -
stan motor be removed and he [d "ertically whi Ie
!.>cing lubricated. Manuall;' rotate the shaft to
"'ork the oll in.
To lubricate the pressure roller bear-
ings, the c1p should !.>c remo,'ed and ("'0 drops
of oil pl ac ed On thc piyot bearings.
Carefully clean the capSlan shaft and
pressure roller tire with isopropyl alcohol to
renw,·c any trace of oil.
A
I I other bearings in the transport are
o