McIntosh C42 Manuale utente

AUDIO CONTROL CENTER

BALANCE

FECORO

@@@@@@@@@

LISIEN

VOLUME

llltlnlogh

C42 AUDIO CONTROL CENTER

LRLINE 1

LINÈ2-O

35 70 150 300 600 1.2k 4k

?g5

CONIENIS

Performance Specifications ..........

Notes .........

Rear Panel

Section Locations

Block Diagram ...................

lnterconnection Diagram ...

Main Schematic and PCB...

Balanced Schematic

Display Schematic and PCB

Tone Schematic and PCB ...

Data Schematic and PCB ...

Parts List.....

Exploded View and Parts List...

Repacking lnstructions

...6-1

.... 1B-20

....21-24

....25-26

....27-28

....29-31

....32-34

......... 35

mlntû5h

SERVICE MANUAL

PE RF O RMAN CE S PEC I F I CAT IONS

FREQUENCY RESPONSE

. +0, -0.5d8 Írom 2OHz to 20,000H2

TOTAT HARMONIC DISTORTION

O.OO2% maximum Írom 2OHz to 20,000H2

SICNAT TO NOISE RATIO

Phono: S6dB (A Weighted)

High Level: 97dB (Aweighted)

RATED OUTPUT VOTTAGE

Main and Outputs 1 and 2:2.5Vrms

MAXIMUM VOTTAGE OUTPUT

Main and Outputs 1 and 2:1OVrms

OUTPUT IMPEDANCE

240 ohms

INPUT IMPEDANCE

Phono:47k ohms, 65pf

High Level: 22k ohms

SENS¡TIVITY

Phono:4.5mV for rated output

High Level: 450mV for rated output

MAXIMUM INPUT S¡CNAI

Phono:5OmV

High Level:5V

VOTTAGE GAIN

Phono to Tape Out:40d8

High Level to Tape Out:OdB

High Level to Main Out: 15dB

POWER REQUTREMENTS

1 O0Volts, 5O/60H2, 30 Watrs

1 1 OVolts, 5Ol6OHz, 30 Watrs

1 20Volts, 5Ol6OHz, 30 Watts

22oVolts, 5O/6OHz, 30 Watts

230Volts, 5O/6OHz, 30 Watts

240Volts, 5Ol6OHz, 30 Watrs

Note: Refer to the rear panel of the C42 for

the correct voltage

DIMENSIONS

Width: 17-1/2 inches (44.5cm)

Height: 5-3lB inches (13.7cm)

Depth: 1B-1/2 inches (44.5cm) ,including

clearance for connectors

NOTES

1 . The heavy notes on the schematic denote

the primary signal path.

2. Unless otherwise noted, all voltages

indicated on the schematics are measured

under the following conditions:

a. AC input af "l2O volts, 50/60H2.

b. All voltages are +/-10% with respect to

ground. A high impedance (10 megaohm)

voltmeter must be used.

3. Unless otherwise specified:

a. Resistor values are in ohms.

b. Capacitor values are microfarads (uF).

c. lnductor values are in microhenries (uH)

4. On PC board drawings, Square pad

indicates:

a. Polarized Capacitors - Positive

b. Diodes - Cathode

c. Others - Pin 1

5. WARNINC: ^

Parts marked with the symbol ,/ ! \ have

critical characteristics. Use only replacement

parts recommended by the manufacturer.

REAR PAAVET

SECTIOAV LOCAIION5

BALANCED

PCB

IVAIN

PCB

DATA

PCB

TRANSFORMER

TONE

PCB

TONE

PCB

DISPLAY

PCB

.@ @'@ @'@ @.@ @ @.@ @.@ @.@

"@ @"@ @"@ @.@ @ @"@ @-@ @.@

WARNINOsffiHffD. I

c42

C€

æMffi{.¡mWNWO

ffidS@MñE

ffi,lmGNYffi

dEma0ilmre-

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oMW

alßo

ffi8 FnOCffiF

TÆ2 IÆI FM TO

LISTEN-

-RECORD

tÐv!ffi¡æwÁÍ8

POiYÉRCONTROL

-OAT

POBTS-

MIN 1 fÆI Ð LN! HMl

INPUTS

tÆa fÆl wâ æ LMz AUX? Mt N H

M&F

wrc

*il" ö

K(. ) (o)

\vv

rcc 2 TpE2 UE8 1ffi2 AU¡

AMsñsE*ffi-

rucmtu-NPÆwm.

ËM PMUN¡ÚSIBIEE

CEÆM,¡uffiEÍMÍAG

------------{

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ll il

3ãe õ:!

ì5

ÉsÉ

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Få

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rËd3 ssÊE

BLOCK DIACRAM

- -Ë- -qE-----

= - " 3-^ Þ É e

e,ä

ös

t-"üH-l

óP

--Ëå--__l

>EF 55

Épç"-:=É

-v.HÉ!ããñ

gÉ

1 20V AC

50/60 Hz

- s:$< --f

t il "" 1

-$d Ís

Éã å5

POWER

TRANSFORMER

POWER

SWTCH

¿a

*6 Ês

2E ãËF

E3d

úâ2

9')

s39 <35 EÊÊ

=Þ

çå

Íá uq *

tÊ

1/A\/IERCON I\ ECTIOAV D IAC RAM

TONE

DISPLAY

J6'

r1 :? p

J9-

oô

.l1a J19 J20 J14

J13 J9-

MAIN

BLVGBY GRY

POWER

SW]TCH

GRY vto

vto ALK

þþÞ

TONE

1 20V AC

50/60 Hz

J7-

DATA

J2-

BALANCED

.i1,

J2,

.t6

TOTONE

û-18V 18V

¡{L*,,u

L'u

NBAUNCED

JNBALANCED

C123 R239

10 ,oa

R2Z2 C154

a2Z? C168

R2tO C150

B22O C162

221 +

F217 c 153

F1 45

Ft 43

MAIN

SWTCHED

MAIN

OUTPUTS

c169

K42 8223

221 10

K41

K¿3

LISTEN

K40

F89

2.21

r4r

OUIPUIz OU]PUI1

1AV c166

cr46

R175

100

Rl 52

100

L HDPH

J9,2

J9 1

J9,1

J9-2

J93

HDPH

GND

R1 04

10M s

868

SR$ P9

l-*

R279

4 32k -*

Èã

22ÞF

c224

ECTIONS

ìND

B]GHI

BALANCED TO UNAALANCED

MAIN f l of 4) o4s1l6

F16

10k

AOUTR

AGNDL

DGND

AINL

AGNDL

AOUTL

RIGHT

VOLUME CONTBOL

tc4

DAIAO AGNDR

MUIE AINB

ZCEN AINL

DAIAI AOUIL

SCLK AOUTR

DATAO AGNDR

POWER CONNECTION

tc33 16

a5V

GND

5vl

c 115 F24

10k + BAUNCEDAMP

c1 73

LISAUO'L+ N:

F23

10 1k 5V

LEfl

VOLUME CONINOL

tc5

5V2 +F198

n20 ++

5vL 4--f--^ ^+ sv2

I *,.

' 221

.5vL +--l--^^^.+ 5vz

R196

LEfl

LISTEN

UNAALANCED IO

BAUNCED R 110

c7 5vL BASNCED AMP

c174

POSIltvE

5 VOLT REGUÁÍOF

18V 5V2

NEGATIVE

5 VOLT REGULATOR

-1 8V 5V2

c17

c1 19 838

10k

+ BALANCEOAMP

c1 75

LISAUD R+

8271

5\2 +

435

5vR 5V2

RIGHT

LISfEN

UNBAUNCED TO

BALANCEO ß31

221

*Tä^*

I-5V2 5V2

c21

BASNCEDAMP

c176 IJ

OV +

c42

(2 of 4) o+gtso

DATA

A *o**,"G: Parts locatecl in the shaclecl

area have critical characteristics Use ONLY

replacement parts recommended by the

manufacturer.

EXTERNAL

sENSÕR

J17

NEGATIVÉ 24 VOLT

r€Ð J18

FEDIYÊL

8ru

D1 3

Rì

J19

J20

REÐ

ñEGAllVÉ 18 volf

FEGULAfOfi

POSITIVE 18 VOLT

REGULA-TOR

3É To

POWEâ FAIL

DSIECTOF

rc1

c181

017

R258 R231

Ð11

ÕOE

sg*

J15

BIU J14

POSi-I¡VE 5 VOLT

B€GULATOR

OOé

GP2

õE

0ATA O5rËC10F

R121

1BV

031

D15

DAIA

DÊÌVEÊ

POWEBON

ÊI

EXTEÊNAL

SENSOR

DFI}EN cMWE

lcz tc2

tc2

vE 24 VOLT

\T\E 18 VOLÍ.

IVF 18 VOLT

IEGULATOR

DATA

CTRLEN

595CLK

PFAIL

CTRIEN

595ctX

DÀTA

soHl

D14

-24V

oÞc

Gõ

EMI

FlLT€B

REGULATON ,

- 8-ri

_ N-1

" +l

'18V

18V

F26

FRONÎ PANEL

I¡MP DFIVER

MIJTE LED

oScrLtÀfôn

4232

'tk

R228

J13-12

Jt+11 LAMP ON

VFD

J1+10

J13. IVOLCK

vôLcs

J13- 7S€NDATA

J13- 6CTBTEN

J13 5 SDAfÂ

J13 4 595CLK

J13- 3PFÀIL

J13- 2

J13 1GNO

J7- I

J7-8

J7- 7

J7, 6

J7- 5

J7- 4

Jê1

Jç2

JG4

J6-5

J6€

J6-¡

J6€

JGg

J+10

Jç11

JçI2

r1-1 I

ri.a I

J1-6 o

J1.5 I

J1,4 :

J1-3

r1.2 I

Jfe I

lcl -24V

lc1

tc1

PFAI

)WEA FA}L

)gtEcTon

rc1

SITI\E 5 VOL1 :

REGULATOR,

fÈ----t+ sv

I - +l

IOI

POWER

DRIVER

o23 fPOWËR CONNECTIONS

tc1,rc2, I

GND

18V

G¡TD

OUTl

OUT2

POWERON

J7-3 \\POWERON^

_.---7r--"\y

J7- 1

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