McIntosh MX 112 Operating and installation instructions

nWntosb

112

FM/AM

TUNER

PREAMP

SERVICE

INFORMATION

FROM

SERIAL

NO.

10S01

39S99

MclNTOSH

LABORATORY

INC.

CHAMBERS

STREET

BINGHAMTON,

NEW

YORK

112

ELECTRICAL

SPECIFICATIONS

TUNER

SECTION

PREAMPLIFIER

SECTION

USABLE

SENSITIVITY

Better

than

2.5pF

(IHF

usable

sensiti¬

vity)

SIGNAL

NOISE

RATIO

Better

than

65dB

HARMONIC

DISTORTION

Mono,

less

than

0.5%-

Stereo,

less

than

FREQUENCY

RESPONSE

Flat

from

20Hz

20kHz

with

standard

de-emphasis

and

19kHz

pilot

filter

CAPTURE

RATIO

Better

than

1.5dB

SPURIOUS

REJECTION

90dB

greater

IMAGE

REJECTION

75UB

greater

(at

100MHz)

STEREO

SEPARATION

Better

than

30dB

kHz

TUNER

SECTION

SENS1TIVITY

Better

than

12pV

1000kHz

(using

ex¬

ternal

antenna

input)

SIGNAL

NOISE

RATIO

Better

than

55dB

HARMONIC

DISTORTION

Less

than

l%.at

30%

modulation

FREQUENCY

RESPONSE

Down

6d8

5kHz

SELECTIVITY

10kHz

-6dB

IMAGE

REJECTION

60dB

greater

1000kHz

FREQUENCY

RESPONSE

+0.5dB,

20Hz

20,OOOHz

DISTORTION

Less

than

0.1%

2.5

volts

20Hz

20kHz

INPUT

SENSITIVITY

(phono

and

phono

millivolts

for

2.5

volts

output

kHz

INPUT

SENSITIVITY

(aux,

tape)

0.25

volts

for

2.5

volts

output

HUM

AND

NOISE

(phono

and

phono

72dB

below

millivolt

input

HUM

AND

NOISE

(aux,

tape)

85dB

below

rated

output

OUTPUT

(main)

2.5

volts

with

rated

input.

volts

can

developed

without

distor¬

tion.

and

will

produce

volts

output

100%

modulation.

OUTPUT

(tape)

0.25

volts

with

rated

input.

Phono

input

signal

millivolts

produces

1.2

volts

output.

and

will

produce

volt

output

100%

modulation.

OUTPUT

(center

channel)

volts

with

rated

input

both

channels

BASS

CONTROL

-18dB

+16dB

20Hz

TREBLE

CONTROL

+20dB

20,OOOHz

FILTER

Flat

roll

off

below

50Hz,

down

12dB

20Hz

FILTER

Flat

roll

off

above

5000Hz,

down

12dB

20,OOOHz

FM/AM

TUNER

SECTION

PREAMPLIFIER

SECTION

112

SCHEMATIC

NOTES

Unless

otherwise

specified:

Resistance

values

are

ohms,

1/4

watt,

and

10%

tolerance;

capacitance

values

smaller

than

are

microfarads

(pF);_

capacitance

values

greater

than

are

picofarads

(pF);

inductors

are

microhenries

(pH).

Printed

circuit

board

components

are

outlined

the

schematics

dotted

lines.

The

circled

num¬

bers

around

the

dotted

lines

correspond

the

numbers

the

Board

layouts.

The

heavy

lines

the

schematics

denote

the

pri¬

mary

signal

path.

The

terminal

numbering

rotary

switches

for

reference

only.

All

voltages

indicated

the

schematics

are

mea¬

sured

under

the

following

conditions:

Use

megohm

input

impedance

VTVM.

All

voltages

+10%

with

respect

chassis

round.

signal

input

antenna

terminals.

input

117

volts,

50/60Hz.

Front

panel

controls

at:

Tuning

indicator

100MHz

(no

signal)

Volume

Ful

CCW

Mode

Stereo

Muting

Input

Selector

Panel

Lights

Out

(to

measure

section)

(to

measure

section)

Bright

units

with

serial

numbers

below

11S00:

C25

connected

T3;

connected

ground;

C31

connected

T5;

connected

ground.

units

with

serial

numbers

below

11S17

C25

and

C31

are

2.2pF;

C33

6.8pF

and

con¬

nected

T3;

C35

.OOlpF;

C60

not

used;

R20

33k;

R23

33k

and

con¬

nected

shown

clotted

line;

(part

num¬

ber

122-013)

used

place

R62;

and

C61

are

not

used;

R225

470k;

R206

and

C203

(part

number

064-069)

are

used

and

are

con¬

nected

shown

dotted

line.

con¬

nected

the

other

end

shown

dotted

line.

R221

used

units

with

serial

numbers

be-

1ow

14S01.

units

with

serial

numbers

from

17S40

22S65:

R63

used

place

L10;

R64

and

are

used.

units

with

serial

numbers

from

17S25

17S75.

C73

used.

units

with

serial

numbers

below

17S25:

R35,

R38,

R41

R43,

and

R44

are

used;

R37

470k;

R55

lk;

R52

and

R15

6.8M.

units

with

serial

numbers

below

17S40:

C345

used;

R397

and

R398

are

not

used.

units

with

serial

numbers

below

8S35,

not

used.

units

with

serial

numbers

below

20S00:

R53

and

R59

are

lOOP;

not

used;

Ll,

R6,

R61,

and

CIO

are

used;

there

connection

from

C12

number

the

mixer

and

local

oscillator

Board;

and

connected

shown

dotted

line.

10.

units

with

serial

numbers

from

19S63

31S34,

R66

used.

11.

units

with

serial

numbers

from

20S72

31S35,

R67

and

R68

are

used.

12.

units

with

serial

numbers

below

26S01

R55

270Q;

R69

and

are

not

used.

13.

units

with

serial

numbers

below

25S1I,

R399

and

R400

are

not

used.

(continued

alignment

page)

112

LEFT

CHANNEL

PREAMP.

PRINTED

RIGHT

CHANNEL

PREAMP.

PRINTED

CIF

112

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