McIntosh MX 115 Operating and installation instructions

SERVICE

INFORMATION

STARTING

WITH

SERIAL

NO.

AB1

001

McIntosh

laboratory

inc.

chambers

street

binghamton,

new

york

115

ELECTRICAL

SPECIFICATIONS

TUNER

SECT

ION

USEABLE

SENSITIVITY

SELECT

ITY

2.5

ovolts

100%

modulation

(+75

kHz

deviation)

for

total

noise

and

harmonic

distortion

IHF.

ADJACENT

CHANNEL:

minimum

IHF

"NORMAL"

Position.

minimum

IHF

"NARROW"

Position.

IGNAL

ISE

RAT

ALTERNATE

CHANNEL:

below

100%

modulation.

minimum

IHF

"NORMAL"

Position.

minimum

IHF

"NARROW"

Position.

CAPTURE

RAT

1.5

minimum.

HARMONIC

DISTORTION

Mono:

Does

not

exceed

0.3%

100%

modulation

+75

kHz

deviation.

Stereo:

Does

not

exceed

0.7%.

SPURIOUS

REJECTION

IHF

minimum.

IMAGE

REJECTION

minimum,

MHz

108

MHz.

STEREO

SEPARAT

ION

AUDIO

FREQUENCY

RESPONSE

1,000

Hz.

15,000

with

standard

de-emphasis

(75

psec.)

and

19,000

pilot

filter.

SCA

FILTER

rejection

from

kHz

kHz.

275

per

octave

slope.

PREAMPL

FIER

SECTION

FREQUENCY

RESPONSE

+0.5

dB,

20,000

Hz.

DISTORT

ION

Less

than

0.1%

2.5

volts

20Hz

kHz.

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

below

millivolt

input.

HUM

AND

NOISE

(aux,

tape)

below

rated

output.

OUTPUT

(main)

2.5

olts

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

1.2

volts

output

100%

modulation.

OUTPUT

(center

channel)

volts

with

rated

input

both

channels.

BASS

CONTROL

-18

+16

Hz.

TREBLE

CONTROL

+20

20,000

Hz.

FILTER

Flat

roll

off

below

Hz,

down

Hz.

FILTER

Flat

roll

off

above

5000

Hz,

down

20,000

Hz.

TAPE

OUTPUT

115

MPX

PRINTED

CIRCUIT

BOARD

044-291

Step

Before

stringing

unit,

turn

pointer

adjustment

screw

until

pulley

"A"

the

center

its

travel.

Step

String

unit

shown.

Step

After

stringing

unit,

turn

tuning

shaft

until

pointer

far

the

left

will

go.

Turn

the

pointer

adjust¬

ment

screw

until

the

pointer

coincides

with

the

zero

bar

the

logging

scale.

TUNING

CONDENSER

DRUM

Step

lj.

Turn

the

tuning

knob

making

the

pointer

move

back

and

forth

from

one

end

the

dial

scale

the

other.

Return

pointer

the

far

left

DIAL

CORD

SEQUENCE

POINTER

DIAL

STRINGING

BLACK

(TO

TUNING

SHAFT

)

100

115

SCHEMATIC

NOTES

Unless

otherwise

specified:

Resistance

values

are

ohms,

1/1+

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

numbers

around

the

dotted

lines

correspond

the

numbers

the

Board

layouts.

The

heavy

lines

the

schematics

denote

the

primary

signal

path.

The

terminal

numbering

rotary

switches

for

reference

only.

All

.voltages

indicated

the

schematics

are

measured

under

the

following

conditions:

Use

megohm

input

impedance

VTVM.

All

voltages

+10%

with

respect

chassis

ground.

signal

input

antenna

terminals.

input

120

volts,

50/60

Hz.

Front

panel

controls

at:

Tuning

indicator

100

MHz

(no

signal)

Volume

Fully

CCW

Mode

Stereo

Muting

Out

Input

Selector

Panel

Lights

Bright

Selectivity

Out

Voltages

shown

rectangles

are

measured

with

selectivity

switch

the

"In"

position.

CHASSIS

BOARD

044-277

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