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

,

,.,

u

,.

,

'-'

u

,.,

'-"

,.

"

2. 10

•

..

,

..,

...

u

,

,.,

u

"

GAL 1

GA2.7

6A3.3

GM.

I

6M

.2

"G81. 1

683.2

600

. 3

6B4.

"

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)

,-,

,.,

,-,

2-'

,-,

.-,

H

'-2

...

'-0

.

-,

6A-I

fA_l

(A

- l

fA-2

6D-I

6B_I

68-2

oc-,

OC-'

OC-2

FRO:>.,

MA

TIER

TABLE

OF

(CO"t)

Sectlon

.

_-

-

00'.

6C4.

6CS. I

6C5.2

6C5.3

,

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

6C·2

6C·3

6C-3

,.,

A·'

Page

,.,

,.

,

,.,

'"'

,.,

H

..,

...

H

4_10

,.,

,

.,

6A·I

6A-I

6A-2

SA-5

GA-S 0

Figure

5B- \

58-2

6C-

I

6C-2

.-,

'-2

,-.

.-,

.-s

.-,

.-.

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)

.

""'-

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

8-26

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

,,"

'I'

"\

\

,\

I,

I ' 1

"

Side ViE'"

2.1. UNPACKING

,

•

,

•

.'

'.

•

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.

\

\ ' '

,

)\0

"

• \

.-

--

000

0

VIew

<.2. 1. Ib.cl<

Mountl"

,

",

0

,

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

" "

®

,,0.

.."

••

......

..

., .."

.""-",,, ' ,

, "

"'

.

..

"

....

""".

,'

.",

"'"

, I

, , , •

r-

",.,

.

,,,

...

,

, ,

.,

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

@ "

@

.""

...

'"

..

,

..

··

·.

"I·

·!

..

...

""f'

"'"

' ,

, ,

..,;

:-;

,

. , ,

,.

.0

..,

.,." .,," ""'" ..

...

"

....

Q:§J

" ,

".,

'0,,"-,

e ,

..

'.

,.,,-

..

, ,

M

..

'

,,"-'

.....

t

...

..

,,,

...

.

""

"",,.,,,'",.

'"

...

"",,'.

...

.",

..

'

...

""

..

@ @

..

,

..,

...

'"

,.,,'

",,,

'"""

"

..

,,.

""

" ."'''

'.

"""',

no

.,,'"

"'""""

..

,

figure

2 -2.

Interconne

cting

o

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

Scully 280 Series User manual

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