Harris 994 6690 003 User manual

TECHNICAL

MANUAL

INTEGRATED

CIRCUIT

TURNTABLE

PREAMPLIFIER

994

6690

003

March

Technical

Man al

888

1712

001

Printed:

LIST

EFFECTIVE

PAGES

TOTAL

NUMBER

PAGES

FOLLOWS:

PAGE

NO.

SSUE

PAGE

NO.

SSUE

Original

Blank

Original

Blank

Original

Blank

Original

5-2

5-3

through

5-4

Title

Page

List

Effective

Pages

iii

through

1-2

through

2-2

through

4-3

4-4

THE

ASTERISK

INDICATES

PAGES

REVISED,

ADDED

DELETED

THE

CURRENT

CHANGE.

TABLE

CONTENTS

Paragraph

Page

SECTION

GENERAL

DESCRIPTION

1-3.

INSTALLATION

AND

OPERATION

SECTION

III.

MAINTENANCE

PARTS

LIST

SECTION

IV.

SECTION

DIAGRAMS

Introd ction

LIST

TABLES

Page

Table

1-1.

Electrical

and

Mechanical

Characteristics

LIST

ILLUSTRATIONS

Page

Fig re

1-0

Integrated

Circ it

T rntable

Preamplifier

5-3Z5-4

5-1.

Integrated

Circ it

Phono

Pre-Amp

Schematic

iii

Disconnect

primary

power

prior

servicing.

WARNING:

3-1.

3-3.

4-1

Introd ction

Electrical

and

Mechanical

Characteristics

Introd ction

Tro bleshooting

Introd ction

Replaceable

Parts

Service

3-1

2-1

2-2

SECTION

<11.

Introd ction

......

Mo nting

Inp t

Connections

O tp t

Connections

Power

Connections

...

Circ it

Description

4-1.

4-3.

—

2-1.

2-3.

2-5.

2-7.

2-9.

2-11.

EQUALIZED

PREAMPLIFIER

AUDIO

r-OUTPUT

—

INPUT

117VAC

LEVEL

Figure

1-1.

Integrated

ircuit

Turntable

Preamplifier

1-0

Disconnect

primary

power

prior

servicing.

WARNING:

FUSE

INTERNAL

SECTION

GENERAL

DESCRIPTION

INTRODUCTION.

1-1.

1-3.

ELE TRI AL

AND

ME HANI AL

HARA TERISTI S.

1-4.

1-1

Disconnect

primary

power

prior

servicing.

WARNING:

This

man al

contains

all

information

necessary

install,

and

maintain

the

Integrated

Circ it

T rntable

Preamplifier,

part

Fig re

1-1

shows

the

front

view

the

eq ipment

1-2.

operate

n mber

994

6690

003.

s pplied.

Table

1-1

lists

the

electrical

and

mechanical

characteristics

the

Integrated

ircuit

Turntable

Preamplifier.

Electrical

and

MECHANICAL

Characteristics

Table

1-1.

CHARACTERISTIC

FUN TION

47,000

ohms

Inp t

Impedance

Maxim m

Inp t

O tp t

Response

Distortion

Noise

Load

Impedance

0°

+60°

117/234

volts,

50/60

Hz,

watt

Power

Mo nting

Size

Weight

and

C bage

1-2

WARNING:

Disconnect

primary

power

prior

servicing.

Operating

Ambient

Temperat re

Range

least

below

+15

dBm

o tp t,

kHz.

150

kHz

(clip

point),

kHz

(+15

dBm

o tp t)

600

ohms

150

ohms,

flating

for

gro nded

ngro nded

loads.

7-7/16

inches

long,

3-1/8

inchs

wide,

2-1/16

inches

high

Less

than

0.5%

+15

dBm

o tp t,

50-15,000

-2

dBm

with

inp t

kHz

(typically

cartridge

level)

Within

RIAA/NAB

standard

c rve

Net

weight,

lb.

Packed

weight,

lbs.

C bage:

c bic

foot.

Two

holes

for

mo nting

Harris

t rn



table

inside

any

cabinet.

May

mo nted

any

position.

SECTION

INSTALLATION

AND

OPERATION

2-1.

INTRODUCTION.

2-3.

MOUNTING.

2-5.

INPUT

ONNE TIONS.

the

inp t

terminals,

and

2-7.

OUTPUT

CONNECTIONS.

2-9.

POWER

CONNECTIONS.

Disconnect

primary

power

prior

servicing.

WARNING:

—

2-8.

lines

(the

red

wire

and

the

black

wire

7).

and

TB1-6.

Plug

the

line

cord

into

any

standard

outlet

providing

117

Vac

switch

provided

since

the

power

consumption

Watt.

For

234

Vac

jumper

Output

connections

are

provided

for

both

600

ohm

and

150

ohm

For

600

ohm

operation,

connect

the

output

line

TB1-4

and

TB1-7,

Place

jumper

between

TB1-5

For

150

ohm

operation,

connect

the

output

line

TB1-4

and

TB1-5,

(the

red

wire

and

the

black

wire

5).

Place

jumpers

between

TB1-4

and

TB1-6

and

between

TB1-5

and

TB1-7.

The

Output

Level

ontrol

provides

means

adjusting

the

level

the

preamplifier

match

the



quirement

the

following

equipment.

2-10.

+io%

50/60

Hz.

___

...

______________________________

_■

Dress

the

power

cord

away

from

the

a dio

lines

for

minim m

h m.

operation,

remove

j mpers

and

the

board

and

add

new

the

board.

2-2.

This

section

contains

information

for

installing

and

operating

the

Integrated

Circ it

T rntable

Preamplifier.

Refer

Section

for

the

schematic

diagram

that

s pports

the

following

disc ssion.

2-6.

This

Preamplifier

designed

work

with

any

the

pop lar

moving-magnet

cartridges.

recommended

that

the

high

side

the

cartridge

connected

terminal

No.

the

low

side

terminal

No.

and

the

cable

shield

terminal

No.

TB1.

The

impedance

(47k

ohms)

may

modified

changing

the

val e

the

board.

This

sho ld

done

only

special

cases,

s it

non-standard

cartridges.

high

freq ency

scratch

filter

may

added

placing

5000-20,000

ohm

resistor

across

2-4.

The

Preamplifier

mo nted

with

two

No.

self-tapping

screws,

located

3-3/4

inch

mo nting

centers.

The

nit

intended

for

vertical

mo nting,

with

the

line

cord

down

(other

mo nting

positions

may

sed).

Add-on

nits

for

stereo

are

mo nted

placing

the

second

nit's

cover

over

the

special

top-hat

rivets

the

bottom

side

the

first

nit,

and

slid



ing

engage

the

rivets

the

holes.

IR UIT

DES RIPTION.

2-11.

NOTE

2-2

Disconnect

primary

power

prior

servicing.

WARNING:

2-12.

The

internal

power

transformer,

Tl,

provides

voltage

for

f ll

wave

bridge,

which

prod ces

nreg lated

positive

and

negative

Vdc.

These

voltages

are

series

reg lated

and

provide

reg lated

+15

Vdc.

The

inp t

signal

from

the

cartridge

voltage-amplified

the

(Ul),

amplified

the

c rrent-boosters

(Ql

and

Q2)

which

then

drive

the

o tp t

transformer

(T2)

thro gh

control

R18.

The

R1AA

C rve

prod ced

means

negative

feedback

o tp t

and

the

other

inp t

Ul.

strong

fields

necessary

modify

the

gro nding.

Install

solder

l g

nder

the

screw

above

and

the

left

terminal

No.

Termi



nate

the

inp t

and

o tp t

cable

shields

this

point

keeping

the

shield

con



nections

short

possible.

SECTION

III

MAINTENANCE

INTRODUCTION.

3-1.

TROUBLESHOOTING.

3-3.

Sho ld

OUTPUT

CONNECTIONS

Normal

CARTRIDGE

Replace

o tp t

obtained

with

oscillator

b t

line

cord.

3-1/3-2

Disconnect

primary

power

prior

servicing.

WARNING:

POWER

SYSTEM

s pply

dead,

blown

f se,

objective

Check

o tp t

Tl,

across

C18

and

C19

and

gro nd

and

gro nd

shown

fig re

5-1.

SIGNAL

VOLTAGES

sensitive

VTVM

req ired,

also

record

these

readings

for

f t re

tro bleshooting.

CIRCUIT

VOLTAGES

With

normal

operation

the

voltages

Record

the

gro nd

connects

amplifier

gro nd.

for

normal

o tp t,

kHz.

not

with

the

original

cartridge.

TRANSISTOR

AND

S bstit te

new

ones

tester

available

the

original

transistors

show

defective

test.

INPUT

CONNECTIONS

One

side

gro nded,

s re

cartridge

Feed

inp t

from

oscillator

-40

dBm

3-2.

This

section

provides

information

for

servicing

the

Integrated

Circ it

T rntable

Preamplifier.

3-4.

The

Preamplifier

has

received

thoro gh

factory

check,

tro ble

enco ntered,

check

the

following:

the

schematic

will

obtained,

+20%

with

acc rate

meter,

voltages

the

Unit

for

f t re

se.

OUTPUT

CONNECTIONS

Co ld

loose

shorted,

o tp t

may

heard

with

phones

with

proper

operation.

SE TION

PARTS

LIST

INTRODUCTION.

4-1.

NOTE

REPLACEABLE

PARTS

SERVICE.

4-3.

4-1

Disconnect

primary

power

prior

servicing.

WARNING:

Act al

component

val es

may

vary

slightly

from

component

val es

listed

schematics

and

parts

lists.

D e

ind stry-wide

shortages,

sometimes

necessary

parts

other

than

those

specified.

every

case,

however,

s bstit te

part

selected

for

conformance

overall

design

specifications

that

eq ipment

performance

not

affected.

4-4.

Replacement

parts

are

available

ho rs

day,

seven

days

week

from

the

Harris

Service

Parts

Department.

Telephone

217-222-8200

contact

the

Service

Parts

Department

address

correspondence

Service

Parts

Department,

Harris

Broadcast

Prod cts

Division,

Harris

Corporation,

123

Hampshire

Street,

Q incy,

Illinois

62301

USA.

4-2.

This

section

provides

description,

reference

designator

and

order

n mber

for

selectable

replaceable

parts

for

proper

maintenance

the

Integrated

Circ it

T rntable

Preamplifier.

Refer

table

4-1.

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