Scully 280 Series - Page 16

TAVE TR .... '15PORT
The oontrol systom co"talns all theelc_
mente necessary to pnvlde prop<l" tape len'lon
In all modes of operatIOn.
In the slarl mode. the voltage supplied
to the torque moton IS lovemed by the posi_
tion Of the reel_Itches. beingeltber
SO volts AC for snu.1I reels or 70 volts /I.e for
large reels. In the fa. mode, the torque motor
the reel U the supply operates
unMr reduced voltage (35 volts) while the mO_
tor for the reel acting U takenp receives full_
line voltage lrom the PJwor supply.
1:!QI!.; For half_Inch Upe. 70 and 9-0 volts are
USON! Instead of and'O vOltB.
4,1.4. Reel Stabilizer Assembly(s..e fig. 8-1.)
!be reel stabilizer ass'y protects the
Upe motion Over the by aCting as a filter
and minimizer of mechanical ' ... nsients in the
tape t ranSJXlrt. particularly those originaling In
the luppty reel Oscillations (flutt er)
when lape motion 16 Ituted are reduced
by the ab!!Oroing :letlen of thoe reel Idler arm,
4 serape tIlter
High frequency /luller. oommonlycalled
·scrape: or FM hOISt. 15 caused by longi_
vibration of lengths of tape.
and Is generally 1<\ the 310 5 kc range. It ap_
pears ao an Unplea5ant baeqround noise whe"
mld_lrequency ranges are rec(>l-d.ed and re-
produced. This FM Is materiallv re_
duced by the inlroducllon 01 a small_diamete r
member Into contact with the Upe as
clole to the heads as p)lSible.
A high f .... que'cy or scrape !iller Is
located on the head assembly between the rec _
onl and playback hea·i5 (see ftg. 8-2). It IS
an Integral part of tM tape litter arm. and h
In longitUdinal contact with the tape when the
tapoe lifter is inoperatiTe.
4.1.6. Other Featu r es
The tape break arm ab..orbs stal"'llng
loop. and stopping ShoCkS and aclUales the
tape break switch SI08 located dlreclL)· be _
neath the arm under the paneL- This Switch
etops the mach ine by deenerglzing too relays
alld cutting of all AC pOwer In the transport.
'-2
1.1 7. Centrol and I'owe .. Ci .. cl>lt3
(See
flgs. 4-2, 4-3 and B-6.)
All of the tunspol"'l control powe<
Cl .. cults are contained In the electrical control
erouls which 18 mounted dl...,etly behind the
tape tnn>PJ1"'I nu.ln p:l1\('1. ThIs assemblr also
contains all lhe _IIChell. relays. and eapael_
tors which control tape tr:mspol"'l opeuUon In
all All motor and intereon_
nectine c,-bles ph'll: Into the eMssis lndlvld_
1,I;I1I}·. All high voltage ac connections art pro_
tected. either In connectors Or br covered
relays.
WI"'n not bel", operated by remote con_
trol. dummy plug PI03 must be Insel"'led Into
the connector JIG3 on the control chassis
r ... .,.,.,trol". ttK>
b.pe break ..... itch SIOS, under the b.pe
transpol"'l main pallel. a..., mounted On One e<l8e
of the eon:rol chauls and are accessible from
the top of the machine through the Operations
Control Panel.
4.2 OPERATI ON (See figs. 4-2, 4-3. 8-6 ,
8 '.J
4.2. I Turn On
Standby po,,'e r II applloo to the tape re-
corder:/reproducer I¥ actuating the rowER swItch
5101 (fig. 8 -7). In Its ON position, this switch
activales P\e internal power supplies, lIghl' the
STOP pushbutton lamp OS IOI, and lights all me-
tcr lamps t,the electronlu clrcuiU. If ra"" h:l.'l
been threadoo, tbe tape brea.lr. rclay KIM Is also
energized ... hen the 24-.-.:1 ... conlrol powe.. supply
(lig. 8-6) is activatOO.
4.2,2. Start and Record
4.2.2. I. Starl
When START bIIlton 5105 is peened,
start rcla} KI03 and capitan solenoid L1GJ arC
energized. The holdllll circuit is through the
normally closed STOP switch SI07 and relays
KI03, KIOI (rcwlnd) and KI02 (last forward),
1"b.1. cir""';t prevents the transport I,-om being
switched from the fast modCl to play with con-
sequent brealllng, spllllng, or of the
tape.