McIntosh MA6500 Manuel utilisateur

SERVICE MANUAL

INTEGRATED AMPLIFIER

CD 2 MONO SPEAKERSCD 1

TUNER MUTEVIDEO LOUDPH AUX

TA PE

HEADPHON ES

SE N SO R

STAN DBY O N

VOLUME

POW ER GUARD

LEFT R IGHT

TREBLEBASS BALANCE

20 200

2.0

POWER OUTPUT

10 0

DECIB ELS

WATTS

400

20 200

2.0

POWER OUTPUT

10 0

DECIBELS

WAT TS

400

Performance Specifications ........................................ 2

Notes ......................................................................... 3

Rear Panel .................................................................. 4

Section Location ........................................................ 4

Block Diagram ...................................................... 5 - 8

Interconnection Diagram .................................... 9 - 10

Input Driver Schematic and PCB ....................... 11 - 18

Heatsink Schematic and PCB ............................ 19 - 20

Lamp Schematic and PCB ................................. 19 - 20

PG Display Schematic and PCB ........................ 21 - 22

Control Schematic and PCB .............................. 21 - 22

Tone Schematic and PCB .................................. 23 - 26

Parts List ............................................................ 25 - 28

Exploded View and Parts List ............................. 29 - 31

Repacking Instructions ............................................. 33

CONTENTS

PREFORMANCE SPECIFICATIONS

POWER OUTPUT, STEREO

250, 200, 120 watts minimum sine wave continuous

average power output per channel, both channels operat-

ing, into a load impedance of 2, 4 and 8 ohms respec-

tively.

TOTAL HARMONIC DISTORTION

0.005% maximum at any power level from 250 milliwatts

to rated power per channel from 20Hz to 20,000Hz, both

channels operating.

INTERMODULATIONDISTORTION

0.005% maximum if instantaneous peak power output per

channel does not exceed twice the rated output with both

channels operating for any combination of frequencies

from 20Hz to 20,000Hz.

OUTPUT LOAD IMPEDANCE

2, 4 or 8 ohms

RATED POWER BAND

20Hz to 20,000Hz

DYNAMIC HEADROOM

2.4dB at 2, 4 or 8 ohms

DAMPING FACTOR

60 at 2 ohms

120 at 4 ohms

230 at 8 ohms

FREQUENCY RESPONSE

+0, -0.5dB from 20Hz to 20,000Hz

SIGNAL TO NOISE RATIO, (A WEIGHTED)

Phono Input: 90dB (84dB IHF) below 10mV input

High Level: 100db (90dB IHF) below rated output

Power Amplifier: 110dB below rated output

SENSITIVITY

Phono: 2.5mV for 2.5V rated output (0.5mV IHF)

High Level: 250mV for 2.5V rated output (50mV IHF)

Power Amplifier Input: 2.5V for rated output

INPUT IMPEDANCE

Phono: 47k ohms, 65pF

High Level: 22k ohms

MAXIMUM INPUT SIGNAL

Phono: 90mV

High Level: 8V

POWER REQUIREMENT

120V, 50/60Hz, 5.0 Amps UL/CSA

230V, 50/60Hz, 2.5 Amps

PREAMPLIFIER MAXIMUM VOLTAGE OUTPUT

Phono: 90mV at tape output

High Level: 8V at tape output

Main Out: 8V at preamp output

VOLTAGE GAIN

High Level to Tape: 0dB

High Level to Main: 20dB

TONE CONTROLS

Bass Control: +/-12dB at 20Hz

Treble Control: +/-12dB at 10kHz

POWER REQUIREMENTS

100 Volts, 50/60Hz at 4.8 Amps

110 Volts, 50/60Hz at 4.4 Amps

120 Volts, 50/60Hz at 4.0 Amps

220 Volts, 50/60Hz at 2.0 Amps

230 Volts, 50/60Hz at 2.0 Amps

240 Volts, 50/60Hz at 2.0 Amps

NOTE: Refer to the rear panel of the MA6500 for the correct voltage.

DIMENSIONS

17-1/2 inches (44.5cm) wide by 7-1/16 inches (17.9cm)

high. Depth behind front panel is 18-1/8 inches (46cm)

including connectors. Knob clearance required in front of

the mounting panel is 1-1/8 inches (2.9cm).

1. The heavy lines on the schematics denote the primary

signal path.

2. Unless otherwise noted, all voltages indicated on the

schematics are measured under the following condi-

tions:

a. AC input at 120 volts, 50/60Hz

b. All voltages are +\-10% with respect to ground. A

high impedance (10megaohm) voltmeter must be

used.

3. Unless otherwise specified:

a. Resistors values are in ohms.

b. Capacitor values are in microfarads (uF).

c. Inductor values are in microhenries (uH).

4. On PC Board Drawings, Square Pad Indicates:

a. Polarized Capacitors - Positive

b. Diode - Cathode

c. Others - Pin 1

5. The voltages enclosed in a box are signal voltages that

are measured with a 2.5mV, 1kHz signal connected to

both channels at the TUNER input jacks.

NOTES

MA6500

Front panel controls are set at:

BALANCE ....................................CENTER DETENT

TREBLE BASS .............................CENTER DETENT

INPUT SELECTORS...................................... TUNER

LOUDNESS .......................................................... OFF

POWER ................................................................... ON

VOLUME .................................FULLY CLOCKWISE

MONO................................................................... OFF

SPEAKER SWITCHES 1 AND 2........................... ON

Rear panel controls are set at:

PROCESSOR ........................................................OUT

PWR AMP INPUT ................................................. INT

SPEAKER TERMINALS .................... NO LOAD ON

OUTPUTS

6. WARNING:

Parts marked with the symbol have critical

characteristics. Use ONLY replacement parts recom-

mended by the manufacturer.

REAR PANEL

SECTION LOCATIONS

120V 50/60Hz 4A

T 10AL 250V

SLO BLO

POW ER

CONTROL

VIDEO

SUM

TUNER

HOME

CD 2

TAPE

POW ER

AMP IN

POW ER

AMP INPUT

MAIN

OUT

TA P E

OUT TAPE VIDEO CD 2 CD 1 GNDPH AUX

TUNER

CD 1

EXT PH

INT AUX

AUX

EXT SENSOR

DATA PORTS IN P U TS

M A 6 50 0 IN T EG R AT ED A M P L IF IE R

SERIAL

NUMBER

McINTOSH LABORATORY, INC., BINGHAMTON, NEW YORK MADE IN USA

LLL

RRR

RIGHT RIGHTLEFT LEFT

WARNING

AVIS

SHOC K HAZARD - D O NOT O PEN . FOR

CONTINUED PROTECTION AGAINST FIRE HAZARD

REPLACE ONLY W ITH SAME TYPE AND RATING FUSE.

RISQUE DE CHOC - ELECTRIQUE - NE PAS

OU VRIR. REM PLACER PAR UN FUSIBLE DE MEME

TYPE, AMPERAGE E T VOLTAGE.

WARNING

AVIS

RISK OF HAZARDOUS ENERGY! MAKE

PROPER SPEAKER CONNECTIONS.SEE OPERATIN G

M ANU AL BEFOR E USING.

ENERGIE ELECTRIQUE DANGEREUSE! VOIR LE

CAHIER D’INSTRUCTION.

IN P U T /D R IV E R

PCB

HEATSINK

PCB 3

TONE

PCB 7

4LAM P

PCB

6 5

CONTROL

PCB

PG DISPLAY

BLOCK DIAGRAM

MA6500

20dB

AMP

20dB

AMP

SUPER TRACKING

VOLUME CONTROL

SUPER TRACKING

VOLUME CONTROL

MONO

SWITCHING

LOUDNESS

COMPENSATION

CONTROL

LOUDNESS

COMPENSATION

CONTROL

MONO

SWITCHING

BALANCE

CONTROL

BALANCE

CONTROL

TONE

AMP

TONE

AMP

TURN-ON

DELAY

TONE

CONTROLS

MATCHING

NETWORK

INPUT

ELECTRO-

MAGNETIC

SWITCHING

INPUT

ELECTRO-

MAGNETIC

SWITCHING

INPUT

ELECTRO-

MAGNETIC

SWITCHING

DATA

PORT

MICRO

CONTROLLER

INPUT

SELECTOR

LOGIC

SENSOR

R IAA

AMP

R IAA

AMP

OUTPUT

MUTING

OUTPUT

MUTING

HEAD-

PHONE

AMP

HEAD-

PHONE

AMP

AUX

TUNER

VIDEO

TAPE

CD1

CD2

TUNER

VIDEO

AUX

TAPE

PHONO

AUX

TUNER

SUM

CD1

CD2

VIDEO

TAPE

HOME

OUTPUT

MUTING

LOGIC

HEAD

PHONE

RIGHT

CHANNEL

INPUTS

DATA

PORTS

CD1

CD2

LEFT

CHANNEL

INPUTS

POWER

CONTROL

EXT IR

SENSOR

TO PREAMP IN (INT)

PREAMP OUT LEFT

TO PREAMP IN (INT)

PREAMP OUT RIGHT

POWER

TRANSFORMER

RECTIFIERS

AND FILTERS

LAMP

FUSE

FRONT PANEL

LAMPS

MAIN

RELAYS

MAIN

SUPPLY

-15V

REGULATOR

15V

REGULATOR

5.6V

REGULATOR

LAMP CONTROL

LOGIC

B-

B+

11.5VAC

-15V

15V

5.6V

THERMAL

PROTECTION

120VAC

50/60Hz

MAIN

FUSE

IN RUSH

CURRENT

LIMITER

BLOCK DIAGRAM

NEGATIVE

CURRENT

LIMITER

POSITIVE

CURRENT

LIMITER

CURRENT

SOURCE

PREDRIVER

POWER

GUARD DRIVER OUTPUT

BIAS

PREDRIVER DRIVER OUTPUT

ELECTRONIC

ATTENUATOR

LEFT PG

INDICATOR

NEGATIVE

FEEDBACK

VOLTAGE

LOG

AMP

POSITIVE

CURRENT

LIMITER

OUTPUTDRIVERPREDRIVER

BIAS

CURRENT

SOURCE

PREDRIVER DRIVER OUTPUT

INDICATOR

DRIVER

POWER AMP

INPUT

SWITCH

NEGATIVE

CURRENT

LIMITER

VOLTAGE

LOG

AMP

NEGATIVE

FEEDBACK

DIFF

AMP

CASCODE

VOLTAGE

AMP

CASCODE

VOLTAGE

AMP

CASCODE

VOLTAGE

AMP

DIFF

AMP

DIFF

AMP

DIFF

AMP

POWER

GUARD

DRIVER

RIGHT PG

INDICATOR

ELECTRONIC

ATTENUATOR

POWER AMP

INPUT

SWITCH

TO PRE AMP

OUT (INT)

PRE AMP IN

(EXT)

TO PRE AMP

OUT (INT)

CASCODE

VOLTAGE

AMP

RECTIFIER

AMP

+++

---

+++

LEFT

METER

RIGHT

METER

SPEAKER

SWITCHING

TURN ON

DELAY

THERMAL

PROTECTION

SPEAKER

SWITCHING SPEAKER 2

SPEAKER 1

LEFT

OUTPUT

SPEAKER 2

SPEAKER 1

RIGHT

OUTPUT

PRE AMP IN

(EXT)

TO MICRO CONTROLLOR

PRE AMP LEFT

(INT)

PRE AMP RIGHT

(INT)

INTERCONNECT

9100

MA6500

INPUT DRIVER 049193 SH 1 OF 3

11 12

INPUT DRIVER 049193 SH 2 OF 3

13 14

MA6500

INPUT DRIVER 049193 SH 3 OF 3

15 16

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