Scully 280 Series - Page 19

TAPE TRANSPORT
4.2.3 Re .... iad
Wilen the REWrl'o"O ..... lIell SIOZ h, .-.;Iu·
ated, relay KIOllseDerglzed and holds via con-
tacta KIO! (6, 1) and the normally cloted STO P
s .... ltch. High torque (high ,·o\tage) II applied I"
the supply mo(Dr through KIOI, (21, 22); low
torque (tow ,·oltage) ts applied to Ihe takeup mO·
lor vIa KIOI <.18, 19). The brakes are released
.... hen brake sJlenoids L104 and LIOS ate e ncr'
glud through KIOI (15, 16).
4.2.4 Fast Fo,.,. .. ard
When the FAST FORW AliD s .... \teh 5103
la actuated, relay K102 Is ene.,i1ed and holds
via «)IItaclS K\o2 (6, 7) :and \he normally dosed
S TOP s ... Uch. High torque (hl&h '·Ollage) Is ap-
plied 10 Ihe t'llteup molo. th r ""ll" KIO! (18, ]9);
low torque (law ,·oHage) Is applied to the sup·
ply motor via K]02 (21, 22). The same eondl·
\ IQ ... U,o.\ 4'l'ly to tbe ltewlnd mode no ... "><Iat ,
bul act In lhe oppo;ijite dlreclloo. The b rake s
are released when brake .olenolda L I04 and
LI05 are energized through KI02 ( 12, 13).
4 .2.5
When STOP button 5101 Is depresscd,
Ihe brake sol.naids and aU r elays are de_enet·
The brakes are applled to both lorque
motou. The Scully system of p.ov\dl", differ·
enllal by the use of I" ... voltage 10 the torque
motor. Is obtained through the back conlac ts of
lhe approprl:or.e relays.
The capslan motor Dl02 will contll\""' IO
operate as \here 15 tape on the reei! and
the lape Is properly threaded. With no lape in
the macllll\e, the tape $wltch 51G3 ... 1lI
open the cir<ull and cui power 10 Iho c:op.tan
motor by de - energizing the lape break relay
KI07. The low ae on Ihe torque motors
lor brake differential will al so be remo,·e<I by
KI07.
4.2. E. Edit
The ..:iit function makes It po .. tble lor
the operalor to rna ... , the tape o,·cr the beads
wilhout havl", il taken up by the mOlor
( B]OI
). Thl! permits lape 10 spill fre ely out.
In this mooe , when the EOfT sw it ch 81M I.
pressed, the edit relay KIOS Is enel'll:lzed. The
Iloklclrcuit i. the I'C STOP .... ltch S I0'7:and the
following relays, KI03 (E, 7) \start}, KIOI (5,
E) ( rewind), and KIOZ (II, 12) (fut forward).
The s upply brake solenoid LI0418 ener·
through K I05(9, 10), reLeulng the trake.
At the same time, the lakeup brake remaL"tS in·
operative while (tI, W) open. The capstan
pressure roller aolenoid 1..103 Is e""'1tized
through KI05 (!2, 13).
Capstan motor BI02 (\erl,,,,s its ;>O'Oier
through KIOS (IS, 26), hypa . ulng Ihe lape break
KIO? (9, 10), ,,·lIleh Is inopen.1ive In
this mode.
Supply mOlor 13103 receives narm;l play
«)Itage Ihrough KI05 (2], 22), while the lakeu!'
Ololor
SIOII .... lthou! power .... hen KIOS (11, 28)
opens.
4.2.7. T2pe Break Arm (See figure 8-3..)
The tape break arm connectS to l nor-
OlaLLy open mlcro.lOlttcll, 5108, located Ulder-
.eath Ihe tape transporl. Whent"" lape '" prop'
erly IhreadC<l Ihrough the m.chlne, Ih"
of the arm closes the ..... lIch and cnergire. the
relay KI07 ... hlch, In turn, pas ..... po""er to the
capstan motor DI02 Ihrough KI07 (9, 10) and
passes low ,·oltage ac 10 the torque molOf5 BIOI
andBl031hrough KIO? (12, 13) to provide brak·
.ng di1lercnl!ai. In the event of tape br.akage
Or any malfunction that caUSl)8 loss of tonsion
<>It Ihe tape arm, the tape break arm mg,·es to
the poalilon, opening SI08 ... ·hi,h, In
'Utn, KIO'l and liS circuils. When
Ihe t
ape IS fully wound OOOllereel, Ihe tape break
uro mO,-e. to Ihe ellt.eme posilion, o;>enl""
S
lOB which, In turn, de·energlzes KIO?:lIId tts
,I r cuils.
4.2.8. AutomatIc Tape Liller
4.2.8. I. Description
The Mod el 280 Recorder/Reproducer 15
oormally supplled wllh an automatic tape lifter
andplaybaekhead hum shield. Separate solenoIds
q:oerate Ihe Iape! lifter and hum shield. (Man-
ually operaled lifter and head shleld are also
2v>l.ilable. )
Operation with lhese t .... ofeatures in var-
ious recorder lunctlons II in T:i.ble
I The aulomatlc fealures may be ",,,, .. IMn
manually, \I desired. as for cueing In fut
"'odes.
4.2. 8.2. Operation
A schematic dJagram of lhe auto:natlc
tape lIfler controll appears In flgure 4. 5. When
the
machine JlO"·er I. lurne<! on, LIOI pulls In