Scully 280 Series User manual

5o,i,l :-"0 . ___ _
INSTRUCTION MANUAL
FOR
Model 280 Series
Recorders/Reproducer s
tunl
Model 275 Series Reproducer s
®Scully
SCULLY RECORDING INSTRUMENTS CO.
DIVISION OF DICTAPHONE CORP.
480 BUNNELL STREET
BRIDGEPORT, CONN . 05607
,"UGuST 1911

Section
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2. 10
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GAL 1
GA2.7
6A3.3
GM. I
6M .2
"G81. 1
683.2
600 . 3
6B4.
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6C I. 1
GCI. 2
6C2.3
6C2 .6
FRONT MATTER
TABU; OF CONTENTS
GE:>tRAL
Description . . . .
Summary.
INS'NLLAT[ON
Unpacking ...
Cable In terconnection.
Power Connection
Ou!pd.
Inputs .
Itemc!e
Phones
Line Termination
Perfcrmance Checks
OPERATING INSTRUCTIONS
General. . . . . . .
Controls and Indicators
Openting Procedure
TAPE TRANSPORT.
Description •.
. . .
Head Assembly .
Maintenance
Adjustments. .
ELECTRON1CS ASSEMBLY
Description • • • . . . .
Alignment
and Performance Checks
MODEL 280 WITH MOTION SENSING.
Description . . . . . . .
Remote Control . . . . .
Operatino: Procedure . . .
Tape Tra nspOrt Description
Operation • • . .
MODEL 2W/SP_14
Description . . .
Controls and Indicators
Operating Procedure .
Tape TranSpOrt
MODEL 275 SERIES REPRODUCER
Description . . .••
Technical Summary ..
Cable Interconnection.
Inputs. . . . .
(Continued)
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2-'
2-'
2-'
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6A-I
6A-I
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fA-2
6D-I
6B_I
6B_I
6B_I
68-2
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OC-'
OC-'
OC-'
OC-2

FRO:>., MA TIER
TABLE OF (CO"t)
Sectlon
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00'.
6C4.
6CS. I
6C5.2
6C5.3
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Oper,<ting Instructions.
Tape Transport .
Electronics Assembly.
Playback Preamplifier.
Power Amplifier ..
MASTER PAIlTS LISTS
REFEREN::::E DRAWINGS
, WARRANTY
AlW SUPPLEMENTARY DATA
LIST OF ILLUSTRATIONS
Fisure
1·1 Models 2S0- 2 and 280_4 Console T,<pe Recorders.
2-1 Deck Layoot ..... .
2-2 Interconnecting Diagram.
2-3 Rear of Amplifiers.
3-1 Tape Transport Control Panel.
3-2 Electronics Assembly Front P... nel
3·3 'f,p<> Thr .. :>ding P>.th.
4- 1 Disc Drake Outline.
4- 2 Model 280 AC Circuits - Simplified ,
4- 3 Model 280 DC Circuits - Simplified.
4 - 4 Rc,<r of Tape Tra n sport ..... .
4-5 Automatic Tape Lifter, Schematic Diagram.
5-1 Model 280 System Dlock Diagram.
5-2 in MuUi-Ch:ume! Machines "ith Sync Fea ture.
5- 3 Model 280 Electronics Test Setup.
5- 4 Multifilter, Schematic Diagram.
6A-I Photograph of Motion- Sensing Transport
6A -2 Tape Thread ing Path (Model 280 with Molion Sensing")
SA-3
280 with Motion Sensing, AC Circuits _ Simplified
6A-4 Moti"" Sensing Adjustment ...
SA-S Model 280 "itll Motion Sensing, OC Circuits _ Simplified
"
Page
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6C·2
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6C-3
6C-3
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SA-5
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Figure
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8-10
8-11
8- 12
8-1 2
8-\3
8-14
8-\5
8-\6
8 - 17
8-18
FROST MATTER
LIST OF ILLUSTRATI O:-;S (ConI)
Modol 28O/SP-14 OC
Control Circuits _ Simplified,
Modol 28O/SP-14 Tension Control Circui t _ Simpllfied,
I nterconnecting Cabling , Model 275
El ec : ronlcs Assembly Panel, ." lode 12 75
Side View of Tape Transport . . . . .
Magnetic Head Assemb ly, Expl oded Vi ew .
Tape Break Arm Assembly ...
Auto:n atic Front Shteld Assembly . .
Au\ o:natic Tape Lifter Asse mbly
OC PO"'er Supply, Schematic Diagram
Model 280 and Early Model 28O/SI'-14, Power and Control Circuits,
Schematic Diagram • . . . . . . . . . . . . . . .
Model 280 wi th Motion Scnsing, Po,, ' er and Control Circu!!s, Schematlc
Dcagram . . . • • • . . . . . . . . . . , , . . . . . . .
Model 28O/SP-14, POwer and Contro l Circuits, Schematic Diagram
Mo,,", l 28O/SP-14 with Motion Sensing, Power and Control Circuits ,
Schematic Diagram . . . . . . .. ."...
Model 275 Reproducer, Po,,-er and Con lro l Ci;cuits, Schematic Diagram.
Elec t ronics Schematlc Diagram, All V ersions of M odel 21)0 (Sheet J 01
2 Sheets). .•.. .... . .. .. . . . . .
Elec t ronics Schematlc Diagra m, All V ers i ons of Moool 280 (Sheet 2 01
2She e tsl. . . . . . . , • , .... . .. .
Electronics Circuit Cards, All Mooo is 280, Parts location Diagram
Mode l 275 Electronics Schematic Diagram .
Model 275 Electronics Clrcu il Cards , Parts Location Diagrams.
Interconnecting Ca ble Schematic, All \Iodels 280 .
Model 275, Interconn ec ting Cable Schematic .. . .
Remote Control Unit, Cat. No, 504210100 -01. Schematic Diagram
(for Motion Sensi ng M odels 280 a nd 280/SP-14) .
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6B-3
68-4
6C-2
6C-3
8-5/8_6
8-1/8-8
8-9/8-10
8-11/8_12
8-13/8-14
8-15/8-15
8-17(8-18
8-19/8-20
8-21/8·22
8-23/8-24
8-25
8-25
8-26
8-27
8-28
8-29/8-30
8-31/8-32
8-33/8-34
Iii

SECTION 1
GENERAL IN FORMATION
1.1. DESCRIPTION
The Scully 280 Series Recorder/Re-
producer is a professional magnetic tape re-
corder of the highest quality, designed primarily
for use in recording studios, broadcast stations
and other applications requiring exacting per-
formance specifications. (See figure 1-1. )
The complete unit consists of a tape
transport mechanism and amplifier assembly.
The equipment may be mounted in a standard
19-inch equipment rack and is also supplied in a
console or in a portable carrying case.
The head configurations available in-
clude monophonic full or half-track and two-
track stereo for quarter-inch tape width. The
280
is also available for half-inch tape widths
in two, three and four-channel configurations.
Tape speeds available are 3 3/4 - 7 1/2 ips,
7 1/2 -15 ips. Tape speeds of 15 - 30 ips can
be supplied on special order.
The electronics assembly of the 280 is
mounted on a 3 1/2 x 19 panel, and the system
is fully transistorized. CCIR equalization may
be obtained when
Figure 1-1. Models 280-2 and 280-4 Console Tape Recorders
1-1

GENERAL INFORMATION
1. 2. TECHNICAL SUMMARY
TAPE SPEEDS: 3 3/4 -71/2ips, 71/2- 15 ips;
other speeds on special request.
MULTI- CHANNEL CONFIGURATIONS: 1/4
inch, 1 or 2 channels; 1/2 inch, 3 or 4
channels; other tape widths and chan-
nels on special request.
FREQUENCY RESPONSE: ±2db 35 Hz to 18 KHz
15
ips, ±2 db 50 Hz to 15 KHz at 7 1/2
ips, ±2db 50 Hz to 7.5 KHz at 33/4 ips.
SIGNAL TO NOISE RATIO: Peak record to noise
(30 Hz to 15 KHz band) using 3M 201
tape or equivalent.
7 1/2 and 15 ips full track.
Stereo or half track .......
FLUTTER AND WOW
Weighted
70 db
65 db
15
ips: 0.08% RMS or better
7 1/2 ips: 0.1 % RMS or better
3 3/4 ips: 0.2% RMS or better
Unwtd.
65
db
60 db
All components between 0.5 and 250
Hz included.
STARTING TIME: Tape reaches full play speed
in 0.1 second.
STOPPING TIME: Tape moves less than 1 1/2"
after depressing stop (15 ips).
TIMING ACCURACY: 99.9%
REWIND
TIME: Approximately 75 seconds for
2400 foot NAB reel.
REEL SIZES: Up to 11-1/8"; 14" on special order.
1-2
TAPE TRANSPORT CONTROLS: Power on and
off, record, individual reel
switches, rewind, fast forward,
start, speed change switch, edit.
AMPLIFIER CONTROLS
size
stop,
Visible Controls: Record level, func-
tion switch, monitoring and meter switch, play-
back level, load termination switch.
Maintenance Controls: (located under
dress strip): Noise balance, playback equaliza-
tion, record equalization low speed, record
equalization high speed, linearity test push but-
ton, linearity control, record-calibrate, refer-
ence set, bias adjust, bias calibrate, bias tuning.
PLAYBACK AMPLIFIER DISTORTION: Less
than 0.5% total harmonic distortion at
+18 dbm.
EQUALIZATION: Follows NAB curves. Capstan
speed switch selects appropriate equal-
ization. CCIR equalization available on
special order.
ERASE FREQUENCY: 60 KHz
BIAS
FREQUENCY: 180 KHz
OUTPUTS: +4 or +8 dbm from 600-ohm bal-
anced line.
INPUTS: Bridging (600-ohm balanced or un-
balanced line) microphone, low impe-
dance (150- 250 ohms).
INPUT IMPEDANCE: 10K ohms.
REMOTE CONTROLS: Record, reWind, fase
forward, stop, play.
POWER REQUIREMENT: 117 volts ac, 50/60
cycles, 275 watts.

SEe Tl O=- 2
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Side ViE'"
2.1. UNPACKING
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The I4pe trarlllport and amplifier are
regularly shipped in two ca rlOrlll. The tll;O fly-
wl>eeia. pow.r cord (plug tn), EIA eenlen
(Scully, If ordered), mounUng II:I.rdware. Allen
II;rencl>ea, and alignment tool are located in a
ha.rd",are bag , which ",til be found In the carlon
COllIa!nlng the lransport me<:han1.Sm . An In-
struction n,anual !s also contained tn the ahip-
ping carton.
2.2. MOUII"TII'<G
The 280 is designed to fit In a standard
19_1nch equipment nck. cabtnet o r conSOle.
The space requirement Is IS_' 4" for llIe tape
transport and 3_1 2" fo r the arTlJlllfier. each
unit extenl1i[l5: 9" behind the panel. lbe reeom_
mended rack placement ts fo r the ampllfte r to
be mounted directly below the tape transport.
or wlth!n limit of the four-foot connectlnc
cables.
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VIew
<.2. 1. Ib.cl< Mountl"
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a . Lift tbe tran'port med>anlsm:Nt of
the cartOn 1.151" tile t wo /lhipp1rc straps hoped
around it fo r this purpose. Remove straps.
b. Mount the transport !n \he <Quip_
ment rac k. usLre tlw panel mounting hardware
T ighten secl.ln l y.
c. Remove flywheels from hardwaN!
tag and- mou"t on the rUPI!ctlve capstan motor
and st abilizer shart •. In IIOme cases tho lIy_
wlwels are spec!flcally manced for capstan Or
rt:>.b1Uu r mountLre.
Flywheels which carry 00
na r kirc' an Ln te r cllareeable and may be lI".ount _
ed on either sh2ft.
d. Remove ampllfler(s) from carton
and moUnt In nck below the tape transport.
using the mountl"l ha rdwa.." osuppUed. In MuIU_
manel mount cllannell amplifier on top.
Then mount .."malnt"l ampUflers below In
numerical oroer. AmpUfler cllannel maIklncs
nay be found on t he rear 01 each amplifier .

INSTALLATIO:>
2.2. 2. Mounting Consol es
;!. . Conooic cabinctn arC 3hippcd In
three containers _ the console cabinet. the tape
transport and the amplifi er{s) Set tlle large
carton on the floor. with the arrow pointing up.
Open the large carton by sllt\i'1g the t ape.open _
ing
the naps and removing th e con:;ole cabind ,
Set th
{' o.thc 1100r. ri-
ser from low er front of cabin{'t, POSItion ele c -
troni, 's cabinet rise rand secu re l'I ittl bolts
supplied .
b. Remove
the cape transport mechan_
ism from the c)rton. using the two shipping
straps looped around it lor this purpose. Re_
move straps and n,ount transport into the cut_
o ut On the top Tighten mounting
c. Mount ampliliers in the space pro_
vided
on the console. For mult i_channel \Jnits.
mount
channel 4 at bottom and follow with re-
maining ut\its above it ir. nunwr i cal or<ter.
d. Rem(}ve flywt1EeIs from bag
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ana mount On the respectiv e capstan motor and
stabilizer shafts. In SOme Cases the flywheels
are for or Irtabil_
Izer mounting. F1ywheels which carry no mark_
i'lgs are i nterchangeable and may be mounted
on
either shaft.
2.2.3, Car:-ying Case
Carrying case models are furnished
in two cartons, One carton contains the tape
transport. wmvletely mowtted except for tlle
flywh
eels . The second cartOn contains tlle am"
plifier{s) mowlted in carr,ing Case
2,3 . CABLE I:>TERCO:O>:>ECTIO:O>
(See figure 8-16.)
In mOnO units the interconnecting cab le
consists 01 the amplifier power section and the
he.d section. Tn the t ,,'o -channeI equip -
menl, the of the requisite f'O"er
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figure 2 -2. Interconne cting
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and head sect.ons. Betore assembling the units
consull the tnterconnectltlg diagram ( fi". I
lor the proper I nstallaUon 01 caDles.
Connect thc small plug P102 to the rc_
lay panel wider Ule tape transport and the large
32-p;n connector P605 to the back of Ihe ampli_
fier. In multi_channel Wlits the 32_pln connec_
tors are mari<ed channel 1. 2. elc. to male with
their respect,ve amplifiers, which are simi_
larily Identif ied.
2.4. POWER CONNECTlO:O<
For ""rmal operation. Connect the jXlwe r
cable from the AC power input eotmeetor on th e
transjXlrt mo·.rnled supply to a 115_120 volt AC.
60_cycle power outlet to assure proper equip_
ment grounding.
2,5. OUTFUT (See figure 2-3 , !
A female type X LR connector is sup_
plied. ThIs cJnnector Is plugged Into the Out_
put Receptacle J603, nornlally 4dbm Inlo a
600-ohm load. However, provision has been
made tor outrut level metering of -oil dbm.
2.6. INPUTS (See
figure 2-3.)
2.6.1. Line
A
throc_pin male XLR COnncctor forthe
line Input Is required. 1\ mates "'ith "Line"
Receptacle J(02;n the rear of the ampllfleras_
sembly. This balanced bridging line input has a
nominal ImJl"dance of 10.000 ohms and Is su it_
able for bri.:ging 600 ohm lines wilh nominal
le;-els from _10 dbm to .10 dbm.
2.6 . 2. Mio",:' phonc
A similar three_pin male XLR connec-
tor for the microphone Input J601 on Ule rear
of the amplifier assembly is also required. Any
low_impedance microphone from 150 to 2>0
ohms can be accommodated with nominal le;-els
up to _30 dbm. The use of high_impedance mi_
crophones Is not recommended .
2,7. REMOTE
The Scully 280 Ikmote Contro l Unit, Cat-
alog 502210100can be supplied to provide remote
operalion in the Play, ReWInd. Fast Fo u'ard,
Stop and Heeord modes. Th e Hc eo rd function
operates atler manual pre-sele C ti On 0 1 (h e line
or mlc mode on the amplifier pa ne !. When the
remole control unit is not being used, the ""mmy
plug P103 must be plugged Into the remote Co n -
trol receptacle Jl03 on the tape transpOrl eon-
Irol pane!.
2,8, PHON<:S
A phone jack for high Impedance head_
plOnes Is provided on Ule front of the amp:ifier
panel. The phones may be used 10 monitor Ule
playback or reproduce output as well as Ule
record amplll\er Inputs from the line or m!cro_
phone Input.
2.9. UNE TERMINATION
The Line Termlnatlons .... ltchon the elec-
leonlcs panel above the phone jack provides a
6OQ-ohm terminallon on Ihe Une outP'J1 when
the switch Is In the ON p3Sltion. The uoll Is
".,termlnated In Ule OFF posilion.
2.10. PERFORMANCE CHECKS
After InstallatiOn, a
ance Checks should be made.
The Inslructlons for the petforrnance
cbecks listed below will be found In the Per-
Checks aM Alignment poHlon of Ule
Electronio Section (Section V).
I, l)e-magnetllatlon of neads
2. Playback level
3. Playback allgnment and
frequency response
4 Record alignment and
calibration
5. Overall record frequency
r esponse
6. Record noise balance
7. Erase adjustment
8. Li nearity adjustment
9. Flutter and wow measurement

[NSTALLATlO:<:
figure 2-3 . Rear of Amplifiers

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SECTiON 3
OPERATING INSTRUCTiONS
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Figure3_I.Tape Transport Control Panel
3.1.
The operat i ng controls lor the 280
Series tape tranSpOrts are located on the op_
erations control panel on the bottom 01 the tape
transpOrt n,.chanism (see rig. 3-1). These are
from lelt to rill:ht. the AC Power Switch. Re_
Record SWitch. Lelt and Right Reel Ten_
sion Rewind, f"ast t'orwaro. StoP.
Start. Capst'-ll Speed Switch and Kdit. Kqualiz.a_
tion is switched with caps t an speed.
The ,-mpllfier panel contro ls a r e shown
In rig. 3- 2. From left to right. these are the
Record Level Control (A), Function Switch (B).
Monitor Switch (C), and Pla,'back Level Control
(D) . The Record Indicator Pilot Light (F). VU
Meter (G), Line Termination Switch (H), and
l'oone Jack II) are also l ocated on th e amplifier
COnlrol [(Ind,
Other amplifier adjustments. which are
not normally made excef( when cbanglng the
ty pe of tape ',sf><! or in servicing the recorder.
are located underneath the panel dress strip
(E), This S'.rip may be remove<! by loosening
the three captive screws,
3.2, CO:iTROLS AND INDICA TORS
3,2. 1, Tape TranSpOrt Ope",tionControl Panel
figure 3-1.)
a. Electronic ardme-
chanicaC The pilot
lamps on the op_
erations control panel and the VU n,eter On the
amplifier assembly are roth illuminated when
the
AC Power Switch is in the 0:> pOsition.
b.
Kecor<!_A red illuminated push_
button COntrols the record function when the
mode switch on the amplifier panel is in lIle
LINE
or M1C poSition. The button,
with the rf><! reeord pilot lamp on the amplifier
panel, remains illuminate<! as long as the ma-
chine is in the record mode.
c, Reel Si.e S"'itches for Left &; Right
Reels ::.
These are a paH of double throw
$"'ilches "'hleh permit individual adjust""nt of
tape te nsion lor 7 irlCh and 10-1 / 2 inch reels in
Start mode only . This does not permit braking in
!'ast Forward or Rewind with dissimilar reels

OPERA TI:->G
d. Hewilld -The lell blue pushbutton
ewitch the maclUM in the Rewtnd or
Fast Rc,'crse mooc.
Fast Forward The right blue push-
buttoo switch operate, the machine in the f"ast
Forward mode.
I. -The white illuminated push-
button sV,'itCh discontinues all operating functions
when
dcpressed. This button continues to 00
illuminated as long the AC power switch is
In the ON position anol thus acts as the tape
transport pilot light.
.s:. Start - A green pushbutton switch
which controistape motion in the play mode a l so
providcs power ncce,sary for thc HECOHD
lunction .
g. Capstan Sp<:ed Switch - This switch
selects the or low spee<lol the drive motor
(normally a two - speec motor) amt also selects
the proper record and playback equalization in
the ampl!liers .
i. Edit - A yellow pushbutton sw!tch
which, permits tape to mO"C in
the start mode without winding onto the takeup
reel. The tape brake arm is also inoperative.
1, External drive to capstan motor -
A socket is provided on the under side of the
relay <;hassis to allowexternai drive to the cap_
stan motor. This can toe used,
(1) As a meanS 01 connecting a more ac -
curatc 60 cycle source to tile capstan
motor. This rray be ""sir e d in instru-
mentation type recording, and where the
local [Xl"'cr
frequency is not reliable
(2) To create speCial ef(ects, by off speed
playback Or recordmg,or
(3) For "ynchrnnou$ playback 01 hIm
sound
tracks.
A 150 watt am?lif i er with an output im_
pedance of 150 ohms is suitable for driving the
motor. (For intermittent Operation
,
o
0 a i' e
10
a a a
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amplifiers may De The mo tor
circuit ie On 1 a n d 8, pi" 1 is
common with one side o( the AC line.)
!I connections are made to pi ns O ther
than and 8 the wiring should be checked for
compatalJility oofo,"" applyi"g power. Not mOre
than I
amp should be drawn Irom pin 3. and not
more than 2 amps tOl,,] Irom 1.3 and 7,
Pins 5 and 6 provi<!c 24 volts al 100 rn" in the
record mo;ie.
3 .2 .2 . Electronics Assembly Front Panel
(See figure 3 - 2.)
a. Record I",.. el - Providcs for the
control of the rccord amplilier lcvcl as indi -
cated by the VU meter when the monitor switch
is in the record positlon.
b. Function Switch _ A fh'e-!X'sition
s"'itch That selccts MIC or LINE iO)}lltlor thc
record amplifier, SAI'£ to prevent accidental
erasure, ,YNC lor channel synchronizatioo
cal""billty, and DEMAG which Isolates the mag-
ndic heads from the e l ectronics, allowing the
operater to dcmagnctize thc "'ithout risk
of transistor damage . The SYNC position ts
norrnallyfunctionatonly on lhree and four chan -
nel model!;.
c. Mon it or Switch - A four-posltlon
switch that the pliy Or record eleclronic
functions .nd allows visual monlter!ng of their
respective levels on the VU m€ter . The third
position provides monltor!ng of the rec-
0rd arnptllier and v!sual mon!torlng 01 thc re -
corder bias leve l on the meier. The fourth po -
sitton pro'ides an audible monitoring 01 the play
amp li fier and a visual mooltorlng 01 the erase
lcvcl.
d. Playback uvc I - The Playback Le,'e I
Controllndudes a Calibrate poSition lor sctting
desired reference level. This is marked CAL
on
the d ial of the playback level control. This
CAL position is utlllzed!n conjunction with the
reference set trimmer, Ident!l!e<l as HEI' SET
,
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l'igure 3-2. Electroni< 's Assembly Front Panel

)
O I'ERATI:-!G
On Ule alignment and calibration control .trlp.
T h. purpocc e>1 t e> ..ltow a reo.dtty av.n_
able r eferen(e te> openttng le,·(, \. In orde r te>
utilize this feat ure. lurn the playback le vel
con trol to tM CAL posttlon . Ad just reference
t one from allJllment tape t orcad''O''{o r deslrtXI
level) by adju'ItlnK reference set tr imme r (IU:F
SE T ). The playbclck level control can be ad-
justed at w\ll, with the oppor t Wli ty to r eturn In-
nantly to operallng level by lurnlng pbybclek
le ... el cont rol to thl! CAL _Ilion . Lorld ler·
mlna ll on req uirements remai n the same.
e. All ment and Calibration Ad us !-
e ron pane ress srp U'
len<><l by three screw.) arc a series of conlrol.
Ih al should no: be adjusltXI "x c ept by ellperlen ced
Ope r a t ors , and then Qn\y .-hen going th rou gh the
complet e test and check procedu r es on the ma-
chill(' ..-h.Ich are OUllined bel ...... The.se conlrols,
reading f rom left to ri ght, are Noise Balanc:e,
l'I ayback Equallzallon, Low3peed Ret.: ... .! Eo,fIo.u,
I,.,.tlon, High Speed Record Equalization, Un ..-
arity T est PUllhbulton, Unea rit y C ontro l, Recon:!
Calibr allon. Playback Level Reference Pot, DiU
Adjustment, Blat Callbration , and Btas
A comp l ete dncrlpUon of these controh will be
found in the Alignment and Pcrlorm anceChec ks
portion of the Eleclronics section {Secllon V} 01
this manual . A combination alignmenl tool Is
fumishtXI l Or the.se adJuslments.
3.3. OPE RA TING PROCEDURE
3.3. 1. Prelim i nary (See flgur e 3-3. )
- Plac e a reel of
b pe hub and thr ead
"" - -f--, ......
as Indica t ed. In tbe tape threading dl"lram
( fi g. 3 - 3). T ape b }""""ely wnen It 18
be t w een the Capmn and th e Pressu ....
b_ Power _ Power lor all operations Is
con troll ed 6Y1Iii" AC power _lteh on the op_
erations con tro l panel of the tape transport
mechanism.
Re co rd
Rewtlld
F
as t Forwan:!
,,,,,
.. "
,& .
Red (lIiumln.lted)
8>00
Wblte (illumina t ed )
C .... en
Ycllaoo-
3.3.2. P layback
Aller properly threading the tape, 5 (1 the
Moni tor swilch on t hC EJ ectronlcs Panel 10 Fl ay.
back. the desired tape speed. and reel
slus by mUM 0' the Capstan Speed and neel
Size swllohes on t he con tr ol panel. Preel Ihe
gr ee n Sta rl bunon. !!2tt.: With mall1,lally
ated ta pe litter the tape Iilter muSI be r aIled 10
113 upper """ili on.
3.3 .3 . Ree o rd h'lg
Selecl the ta pe spe ed (this w!ll aulomat!-
.... ..
, .. " .. .. ,.
S
>--u -. +- ...
• .0 .
1·
_0 0 0000
..... ... ...
Figure 3-3. Tape Threadlng Path
I

OPERATlNC'l'STRUCTIOKS
cally selecl Ihe proper Hewrd and Playback
equallzalion) and 5el lhe monitor n.'lIch on lhe
818CI"""lc8 panel 10 Rcc. ""' .. 8 the
START bullonlostartlape mollonand Illen Pn'ss
Ihe red REcono ootbn. Wlten In Record. the
red button is illumina t ed. The machIne cannot
be s t arted try pushIng the RECORD swItch only,
as 110 tape motIon Is cDntrolled by It. The RE_
CORD bulton
will reroaln lighted as long as Ihe
machlne Is In the Record mode . The machlne
w!ll dropout of Record lithe machIne Is stopped
Or II the function swilch is turned to t he SA FE,
SYNC or DE_MAC poiSlIlon.
,.,
NOTE
ror manually operaled Tapc Iiften
only, Ihe lape \i!:er control arm adu-
alU a record Interlock s"'itch ..hlelt
makes \1 lmpoiSsible 10 go inlo lite re-
cord mode if lhe lape is off lhe heads.
I f, ... htn Ihe Lap<> Itlt".
Is """d 10 lift the lape off 1M head!;,
lite
r_cord function is nol dIsabled (cut
011).
Do not press lhe STAnT bullon Imme_
diately after th<!STOP bullon Is actua-
ted "hen tape haa been m(Wlng In a
hIgh-speed m<.>de. Lellh" lope cease
motton first or the pl<lehlng acUon 01
the pressure roller wIll cayse tape
breakage.
3.3.4. St:>pPlng the linLt
the Stop bunon .. m hall tape
motion from any mode. TIle 280 will automat_
slop If the tape runs off the Or
This b provided for by the Tape Break
Arm. located On the r llht Side Ofthebpe trans_
[W)rt. Imn· ... dhtQly booyond Ih4I Capst.:t.n dd" •.
\

SI:;CTION i
TA P E TRANSPO RT
4. 1. OESC PJP TION
4. I. I. Tape Drive
The l.:odel 280 Recorder !Rep r odutflr
employs a I hrtf!-motor drh'e ay.lcm _ a t.....,-
apeed hysterUIS synchronous tap8tan drl\'C
motor and two in!lJcUon-lype torque motors.
The (:ipSlan ",olor and Ihe aoleno ld attuated
prusUNl rolln dri, ... the lape at a lUlifor m
apeed in t he reprodute , r ecord , and edit modes.
The tapetan r:>Oio r has I....., &etl of windln($ to
provide a and a low t ape lpeed, eUher of
which may he selected by the tajlliU.n Soeed
Switch, loca t ed on the control panel of l he lape
Iranlporl. !'"orthe Model 280 with M oUon sens-
Ing. Or the Mo:tel 280jSP -14 , allo N!ler to sec -
tion 6A Or 6B respectively .
When the Start button Is prnnd , the
capslan soleno id and brake loleoolds are entlr -
,bed. The capstan solenoid e"iatl:U thtl nlbber
pressuN' rollu to the capstan by means of a
mechanLc:lI IIr.kage , pN'8Bing tile tape between
the r oller and capstan firmly. T hecapetan mo -
t or provides the COMtant t ape.peed; c_bo t
lape motion Is assured by the clampln&: action
0( t he preuure roller.
In tile rut modes (forwa rd and rtlwind),
the torque motors drh ... the tape and the cap-
atan motor an d pressure rollers artl inactl"e,
The motor acting as t akeup ",1\5 ",lIh full voll-
atI:\!; IIIe one on the supply "(Ie Operatea wllh
low vollage 50 as to provide proper tape l en-
lion and pr\!Ve.1t a loose wind..
,.
f
4. l. 2. Brak\! $x.lem (see figs. 4_1 and 8-1.)
The Scully brake .ystem Is a disc type
employIng an electrically control1\!d dlfferen-
lIaL Ther\! II AC in the lorque motors . t all
t imes, Includlng t he STOP position, as long as
t t.ere Is lape correctly thN!aded In the madllne,
8r:01r.In&: force Is a IlUlclion of the
sprIngs (3, 4 ). It may be at\jLlliited by the
adjusting sere .... (I, 2). The sprJ.ngs are nor-
mally Se! 110 that they will Jw;t OVerCOme the
low AC vo lt age on the torqUtl motora. '0 the
"wy " ,,,,I f_1 til """rallon, tJ>e trake
solenoids aN! fully enel"lLud, permitting free
rotation of the rettl table.. The brake shoe (6)
Is fastened to the 10ieDOId plunger , but Is free
10 align itseU squarely aa:alnst th e rotating disc
(5) which 18 Integ r al with the Iorque molor.
M echanically, the takeup and supply .... -
s. mblles are Identical. There Is no prov\Slon
for mechanlcal bruin&: differential as a func-
tion of rotational senae. The dlfferentbll. ob-
tained electrla.lly by feeding N!"'ced torque
,""Cltage to t he reel motors ..-heo brakes are
e[erglzed {braktl IOlenoldli de-enel"llz.edj.
With the brakes on In the F ast r .. ·d..
mJde, the takeup r eel motor OVtlrCOmeS .ome
oflhe bruin&: force while the supply reel motor
aCds 10 the braking force, Ihe dlfferenlbl tel""
oI:tained from the rotation of the moton. The
Is true In the RewInd mode.
!'"Igure 4-1. Disc D,ak e Outline

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 tranSJXlrt. 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,,'er 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.

TAPE TRANSPORT
CAUTION
00.- pce5.S the ST AR T !>uUoo, 1",,,..,-
diately after the STO P b.uton I. actu-
ated "'hen tape has been drh'en at high
.peed. Let the t>.pC motion Or tile
plnchlng action 01 tile preuure r Oller
will cause tape brcakao;e.
NOT E
The a l xw e d()('s not app ly to the M odel
260 (or 260/SP- 14 ) wllh Motion Sens-
[iii·
Po""",, read",s the torque motors t hrough con-
t ac t" KI03 (2 1, 22) lor Ihe aupply motor 8103,
and K 103 (U , 19) ror the t ueup mot or BIOI.
The ae ,"Olt",e .,ilI be e i ther 10 vae {high} or
vat (low) depending on the poIIllion of the ' ... ·0
\en.slon
"",I t ches S1D'9, SilO. Brake
LI04 (supply) and (t ue-up) are energIzed
by K IOO (9, 1 0).
Record
The Record ,witch Sl060n the tape trans_
p<>rt cQfltrol panel energizes the record relay
K602, which l)ermlt, bias and erase currenl to
be fed to their respective magnetic heads. The
re cord lights 00]02 and DS60] are lit when K602
is e nergIzed.
Record and playback enuallzation ls
",Ith tape speed and OOlh are controlled
ty the capslan sP«'<l ... ·Itch S1I4. ThiS .....ilCh
xli"ates the equalizer relay K601 in the ampLi-
fier and provIdes lor hl&h - s peed equalizalion.
Lo"'-specl equallutlon normaLly i. prO,· ide<! by
L..., relay .,hen de-energized.
280AC
CAPSTA",
M OTOR
r----,
I r--, I
(
),
J
SII· HIGH
9102
E1 h
sr AAT L-
I SHEOI EQUALIZER
"
'("'" !: c. .- ' ""
"" KIQ5 11:103
UP E [OIT START ' _ A_ST rwo
LI ... E nOI 70 I '3 20 u ' 21 2Q 2. 2tLu. 21
SW AUTO • .1 ---;lr
5·101 TR so "[ .
: SI09 tl 22 22
I ILf!TI S'Z E :" "TCHES 5110
MIOI SUPPLY
-or\.
"y
I
-- J BI03
"
I Y b-- Y IG H rl
TAXEUP
19 d:
MOTOII
l'L".f-" " '- ____ 17 & 11 ","Ti l Q
i\j "
EOIT s r ART rAST EW IND
KIQS 11: 10 1 rwo 11:101 8tOI
It 102
II NOTE 90 YOlT UP ON '201 USEO fOIl HIGHER TAPE SPEEOS A ... D III INCH TAPE
CIRCUIT
SHOWN YIlTH POW [R OH
Fig'Ure 4-2. M odel 280 AC :::[rcuils - SimpUfled

TAN: TRANSPORT
-2 H DC
.W ,
EDUUIZU, R Y,
" m S
·101
" $ - " 4 TlF'E
'"" . RY
UPE
•
..-
5_ 4
KIO I I TAPt: SIU
IRK Sl
.:::r::: SI02
IIE_INO . ,
fAST
",
, •
•• 17
m
ftE _1HC
'"
, " • 7
flo S!±. ? ..,
S 10 3 fAST f _ E
ftY.
X'RUI On
CO N TROl..
K IOI
, •
PU 1 ...
R[W .
'.fW D
"
,.
,
ft''iJ°J,.
r.:.:;: H!:AO (l.Olf (RI0 4 " , . 6
0.
REC$W Slit .-oa \ L
,!£
S 101 n.
. .....
no
.... -,
" •
N"£
.W,
UC):!",G.HT
RI07 ... ,.
a'sTot
", , "
• STAAl fty.
Xl el
$TM T $_
I ., 034
.. , , -""
Sle ,
k
'0 )
• ,
"IT LUI )
•
--
KI D)
'\ '0 $ C
UlT.".
STAAT :1Ofi1r.
SOUIOOIO
,
.,
, -(
I
EOIT?
Sill
ACTIVATED IV
.J....;" LI02
SOL
" OSEDIT ft( WIN D ToP(
• T K lel N Q Llnu
, •
L 104
EDIT 11'1.
$IlPPI.Y lflIoI<l
-
, "
. ,0 2 fAST
fw D SOI.[NOIO
'00
fUE .... IfI,\JlE
1l1oll1 0(1 0 )
" "
,,,
SO L£IO(lI O
"
CI RC U IT SHO WN WITH P'(IWut
Fig\lrc 4-3. M odel 280 DC _ Simplified

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 supply 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

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