Pioneer M-790 User manual

Service

ORDER

NO.

RRV1465

STEREO

POWER

AMPLIFIER

M-790

THIS

MANUAL

IS

APPLICABLE

TO

THE

FOLLOWING

MODEL(S)

AND

TYPE(S).

®

This

product

is

a

system(s)

component.

This

product

does

not

function

properly

when

independent;

to

avoid

malfunctions,

be

sure

to

connect

it

to

the

prescribed

system

component(s),

otherwise

damage

may

result.

CONTENTS

1.

SAFETY

INFORMATION

uuu...

ceeeeeseceescecseceessesesssece

2

2.

PACKING,

EXPLODED

VIEWS

AND

PARTS

LIST

......

3

3.

SCHEMATIC

AND

PCB

CONNECTION

DIAGRAMS

...

8

4.

PCB

PARTS

LIST

«..ccccceccssscscsstvessecscececscensesnccesesscasceescs

23

5.

ADJUSTMENTS.

.........c0c

cece

eecececesccececesececserevecseeeensucs

26

6.

HOW

TO

CHECK

M-790

1.0.0...

ceececceceescsecseressueseseess

30

7.

BLOCK

DIAGRAN

.............ccccccccceccscsssstesecesreseneeeeescess

31

8.

PANEL

FACILITIES

ooo...

cece

cccccscsescccesseueeeecseserees

32

9.

SPECIFICATIONS

0.00.0...

cele

cc

eeeeccecestsscscsevereseseceseece

32

PIONEER

ELECTRONIC

CORPORATION

4-1,

Meguro

1-Chome,

Meguro-ku,

Tokyo

153,

Japan

PIONEER

ELECTRONICS

SERVICE,

INC.

P.0.Box

1760,

Long

Beach,

CA

90801-1760,

U.S.A.

PIONEER

ELECTRONIC

[EUROPE]

N.V.

Haven

1087,

Keetberglaan

1,

9120

Melsele,

Belgium

PIONEER

ELECTRONICS

ASIACENTRE

PTE.

LTD.

501

Orchard

Road,

#10-00

Lane

Crawford

Place,

Singapore

0923

©

PIONEER

ELECTRONIC

CORPORATION

1996

T-FFB

JAN. 1996

Printed

in

Japan

M-790

1.

SAFETY

INFORMATION

This

service

manual

is

intended

for

qualified

service

technicians;

it

is

not

meant

for

the

casual

do-it-yourselfer.

Qualified

technicians

have

the

necessary

test

equipment

and

tools,

and

have

been

trained

to

properly

and

safely

repair

complex

products

such

as

those

covered

by

this

manual.

Improperly

performed

repairs

can

adversely

affect

the

safety

and

reliability

of

the

product

and

may

void

the

warranty.

If

you

are

not

qualified

to

perform

the

repair

of

this

product

properly

and

safely,

you

should

not

risk

trying

to

do

so

and

refer

the

repair

to

a

qualified

service

technician.

WARNING

Lead

in

solder

used

in

this

product

is

listed

by

the

California

Health

and

Welfare

agency

as

a

known

reproductive

toxicant

which

may

cause

birth

defects

or

other

reproductive

harm

(California

Health

&

Safety

Code,

Section

25249.5).

When

servicing

or

handling

circuit

boards

and

other

components

which

contain

lead

in

solder,

avoid

unprotected

skin

contact

with

the

solder.

Also,

when

soldering

do

not

inhale

any

smoke

or

fumes

produced.

NOTICE

(FOR

CANADIAN

MODEL

ONLY)

Fuse

symbols

-#&—

(fast

operating

fuse)

and/or

-§&—®

(slow

operating

fuse)

on

PCB

indicate

that

replacement

parts

must

be

of

identical

designation.

REMARQUE

(POUR

MODELE

CANADIEN

SEULEMENT)

Les

symboles

de

fusible

-————H

(fusible

de

type

rapide)

et/ou

-§&—®

(fusible

de

type

lent)

sur

CCI

indiquent

que

les

piéces

de

remplacement

doivent

avoir

la

méme

désignation.

(FOR

USA

MODEL

ONLY)

1.SAFETY

PRECAUTIONS

The

following

check

should

be

performed

for

the

ANY

MEASUREMENTS

NOT

WITHIN

THE

LIMITS

OUTLINED

ABOVE

ARE

INDICATIVE

OF

A

PO-

continued

protection

of

the

customer

and

service

technician.

LEAKAGE

CURRENT

CHECK

Measure

leakage

current

to

a

known

earth

ground

(water

pipe,

conduit,

etc.)

by

connecting

a

leakage

current

tester

such

as

Simpson

Model

229-2

or

metal

parts

of

the

appliance

(input/output

terminals,

screwheads,

metal

overlays,

control

shaft,

etc.).

Plug

the

AC

line

cord

of

the

appliance

directly

into

a

120V

AC

60Hz

outlet

and

turn

the

AC

power

switch

on.

Any

current

measured

must

not

exceed

0.5mA.

Leakage

current

tester

Reading

should

not

be

above

0.5mA

Test

all

exposed

metal

surfaces

@)

Also

test

with

plug

reversed

(Using

AC

adapter

plug

as

required)

AC

Leakage

Test

equivalent

between

the

earth

ground

and

all

exposed

|

TENTIAL

SHOCK

HAZARD

AND

MUST

BE

COR-

RECTED

BEFORE

RETURNING

THE

APPLIANCE

TO

THE

CUSTOMER.

2.PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

parts

in

the

appli-

ance

have

special

safety

These

are

often

not

evident

from

visual

inspection

nor

the

protection

afforded

by

them

necessarily

can

be

ob-

tained

by

using

replacement

components

rated

for

vol-

tage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

in

this

Service

Manual.

Electrical

components

having

such

features

are

identified

by

marking

with

a

A

on

the

schematics

and

on

the

parts

fist

in

this

Service

Manual.

The

use

of

a

substitute

replacement

component

which

dose

not

have

the

same

safety

characteristics

as

the

PIONEER

recommended

replacement

one,

shown

in

the

parts

list

in

this

Service

Manual,

may

create

shock,

fire,

or

other

hazards.

Product

Safety

is

continuously

under

review

and

new

instructions

are

issued

from

time

to

time.

For

the

latest

information,

always

consult

the

current

PIONEER

Service

Manual.

A

subscription

to,

or

ad-

ditional

copies

of,

PIONEER

Service

Manual

may

be

obtained

at

a

nominal

charge

from

PIONEER.

2.

PACKING,

EXPLODED

VIEWS

AND

PARTS

LIST

NOTES:

e

Parts

marked

by

"NSP"

are

generally

unavailable

because

they

are

not

in

our

Master

Spare

Parts

List.

e

The

L\

mark

found

on

some

component

parts

indicates

the

importance

of

the

safety

factor

of

the

part.

Therefore,

when

replacing,

be

sure

to

use

parts

of

identical

designation.

e

Parts

marked

by

"@"

are

not

always

kept

in

stock.

Their

delivery

time

may

be

longer

than

usual

or

they

may

be

unavailable.

2.1

PACKING

Parts

List

Mark

No.

Description

Parts

No.

NSP

1

WARRANTY

CARD

(KUXJ

TYPE

ONLY)

ARY1051

NSP

1

WARRANTY

CARD

(KCXJ

TYPE

ONLY)

ARY1075

2

OPERATING

INSTRUCTIONS

RRB1167

(ENGLISH)

3.

OPERATING

INSTRUCTIONS

RRC1005

(FRENCH)(KCXJ

TYPE

ONLY)

NSP

4

POLYETHYLENE

BAG

AHG1202

5

PACKING

SHEET

AHG7008

6

REAR

PAD

AHA1666

7

FRONT

PAD

AHA1665

8

PACKING

CASE

RHG1708

2.2

POWER

AMP.

UNIT

SECTION

A

9

>

SS

SN

SA

9

Notes

NOTE

:

Screws

adjacent

to

¥

mark

on

@

Ensure

that

silicon

grease

does

not

adhere

to

the

MOLD

product

are

used

for

disassembly.

A

(No.

6)

and

MOLD

B

(No.

7).

Parts

List

Mark

No.

Description

Parts

No.

Mark

No.

Description

Parts

No.

1

FRONTASSY

RWZ3697

A

16

TRANSISTOR

(Q13)

2SA

1837

2

REAR

ASSY

RWZ3698

A

17.

TRANSISTOR

(Q14)

2SA

1837

3.

HEAT

SINK

ANH7008

A

18

TRANSISTOR

(Q53)

2SA

1837

4

BRACKET

RNE1881

A

19

TRANSISTOR

(Q54)

2SA

1837

5

MICA

SHEET

REE1029

A

20

TRANSISTOR

(Q17)

2SC3181N

6

MOLDA

AMR7005

A

21

TRANSISTOR

(Q18)

2SC3181N

7

MOLDB

AMR7006

A

22

TRANSISTOR

(Q57)

2SC3181N

8

SCREW

(3x10)

ABAI021

A

23.

TRANSISTOR

(Q58)

2SC3181N

9

SCREW

BBZ30P140FZK

A

24

TRANSISTOR

(Q11)

2SC4793

10

SCREW

BPZ30P350FZK

A

25

TRANSISTOR

(Q12)

28C4793

11

DCFAN

MOTOR

AXM7003

A

26

TRANSISTOR

(Q351)

28C4793

A

12.

TRANSISTOR

(Q15)

2SA1264N

A

27

TRANSISTOR

(Q52)

28C4793

A

13.

TRANSISTOR

(Q16)

28A1264N

A

14.

TRANSISTOR

(Q55)

2SA1264N

A

15

TRANSISTOR

(Q56)

2SA1264N

4

5

2

4

M-790

2.3

EXTERIOR

29

See

ey

31

(KUXJ

type

only)

12

Refer

to

"2.2

POWER

AMP.

UNIT

SECTION"

Parts

List

Mark

No.

Description

Parts

No.

NSP

1

CHASSIS

RNE1874

2

INSULATOR

ASSY

PNW1912

3

INSULATOR

ASSY

DXA1490

NSP

4

PCB

HOLDER

AEC1583

5

REAR

PANEL

RNA2037

6

PCB

MOLD

AMR2533

7

AFASSY

RWZ3686

8

PCB

SUPPORT

AEC1581

A

9

FUSE

(FUISI,

8.0A):

REK1086

10

SECONDARY

ASSY

RWZ3692

11

PRIMARY

ASSY

RWZ3772

12

POWER

AMP.

UNIT

RXQ7024

13.

PUSH

RIVET

AEC7010

A

14

AC

POWER

CORD

PDG1015

15

CORD

STOPPER

AEP

-

113

16

SPASSY

RWZ3690

A

17.

POWER

TRANSFORMER

(T1)

RTT1307

18

REGURATOR

ASSY

RWZ3687

19

FRONT

PANEL

RAH2692

20

POWER

SW

ASSY

RWZ3691

21

POWER

BUTTON

AAD7064

22

INDI.

LENS

AAK7075

23

LED

ASSY

RWZ3689

24

H.PASSY

RWZ3688

25

SPEAKER

BUTTON

AAD2416

26

ILLUMI.

PANEL

RAH2696

27.

NAMEPLATE

PAM1608

28

BONNET

CASE

ANE1528

29.

SPACER

REB1300

90°

Sei

vaciessy

31

65LABEL(KUXJTYPEONLY)

ORW1069

32

SCREW

(3X18)

ABA1018

33.

SCREW

(2.6%8)

ABA1095

34.

SCREW

BBZ30P080FZK

35.

SCREW

BBZ40P080FZK

36

SCREW

BPZ26PO80FMC

37

SCREW

VPZ30PO80FZK

38

BINDER

AEC

-

826

39

BINDER

AEP

—

215

40

SCREW

BBT30P080FZK

M-790

3.

SCHEMATIC

AND

PCB

CONNTCTION

DIAGRAMS

NOTE

FOR

SCHEMATIC

DIAGRAMS

(Type

1A)

1.

When

ordering

service

parts,

be

sure

to

refer

to

"PARTS

LIST

of

EXPLODED

VIEWS"

or

"PCB

PARTS

LIST".

2.

Since

these

are

basic

circuits,

some

parts

of

them

or

the

values

of

some

components

may

be

changed

for

improve

ment.

3.

RESISTORS:

Unit:

k:kQ,

M:MQ,

or

Q

unless

otherwise

noted.

Rated

power:

1/4W,

1/6W, 1/8W,

1/10W

unless

otherwise

noted.

Tolerance:

(F):

1%,

(G):

2%,

(K):

£10%,

(M):

+20%

or

+5%

un-

less

otherwise

noted.

4.

CAPACITORS:

Unit:

p:pF

or

uF

unless

otherwise

noted.

Ratings:

capacitor

(uF)/voltage(V)

unless

othrewise

noted.

Rated

voltage:

50V

except

for

electrolytic

capacitors.

5.

COILS:

Unit:

m:mH

or

pH

unless

otherwise

noted.

6.

VOLTAGE

AND

CURRENT:

:

Signal

voltage

at

rated

output.

LJ

ore

V:

DC

voltage

(V)

at

no

input

signal

unless

otherwise

noted.

Value

in

( )

is

DC

voltage

at

rated

power.

o

mA

or

—

mA:

DC

current

at

no

input

signal

unless

otherwise

noted.

7.

OTHERS:

*@

or@

:

Adjusting

point.

°

~@

:

Measurement

point.

*

The

A\

mark

found

on

some

component

parts

indicates

the

im-

portance

of

the

safety

factor

of

the

parts.

Therefore,

when

re-

placing,

be

sure

to

use

parts

of

identical

designation.

8.

SCH-C

ON

THE

SCHEMATIC

DIAGRAM:

¢

SCH-C

indicates

the

drawing

number

of

the

schematic

dia

gram.

(SCH

stands

for

schematic

diagram.)

9.

SWITCHES

(Underline

indicates

switch

position):

H.P

ASSY

$201

:

SPEAKERS(A

/

A+B)

—I

3.1

OVERALL

WIRING

DIAGRAMS

=

>

fave

=

east

fe

(RWZ

3688)

(~SCH-2)

REAR

L

REAR

L

REAR

R

REAR

R

CENTER

t

|

CENTER

ee

SP

ASSY

(RWZ

3690)

(>SCH-2)

OVERALL

WIRING

DIAGRAMS

SCH-1

SP-L-A

OUT

SP-L-A

OUT

GND

SP-R-A+B

OUT

SP—-R-A+B

OUT

9}

SP—R-A

OUT

SP-R-A

OUT

CN210

GND

CN110

TO

TUNER

CONTROL

AMP.

FRONT

ASSY

POWER

AMP.UNIT

(RXQ7024)

(=SCH

(RW23697)

—3)

(}/POWER

RY

(9)/PRO

GND

O)IM.+12V

@)REAR

OUT

©)/s

GND

(S)|

CENTER

OUT

-~12V

@IR

out

@IF

GND

Mit

out

©)

+12Vv

J7601

(Cx—790,

CX-770S)

POWER

SW

ASS

(RWZ

3691)

(+SCH-2)

P155

CHASSIS

AF

ASSY

(RWZ

3686)

(~SCH—2)

CN109

OOO

@QVODNDOoWOWO

CHASSIS

(RWZ

3687)

(-=SCH-2)

(RWZ

3698)

(>~SCH-4)

NEUTRAL

.

AC

POWER

CORD

PDG1

01S

AC120V

60Hz

POWER

TRANSFORMER

A

RTT1307

CN153

REGURATOR

ASSY

OVERALL

WIRING

DIAGRAMS

SCH-1

M-790

10

4

M-790

3.2

AF,

REGURATOR,

H.P.,

LED,

SP,

POWER

SW,

SECONDARY

AND

PRIMARY

ASSEMBLIES

|

SIGNAL

ROUTE

=

-AUDIO

SIGNAL

(FRONT)

[POWER

SW

|

ASSY

|

(RWZ3691)

P156

—

eB

oscacas,

|

accios4

swiS4

Aaso-sss

|p455

H

RDX1014

————

SS

tetra

i

i63.

YT

Qo

ay

ee

ea

eae

al

aia

NOTE

Pr}

3P

on

RESISTORS

5a

ACS

OUTPEL

Indicated

in

TS

45

A

Fuis)

AAIS3

TO

Uniess

otherwise

novedt5%

CAUT1ON:

FOR

CONTINUED

PROTECTION

aie

aa

t

sare)

LIVE

AC

POWER

®

Flameproof

type

(RD1/4PMF)

@

Flameproof

Quick

Open

Type

(RFA1/4PS)

CAPACITORS

Indicated

in

capacity

(uF)

/vol

tage

(V)

M

CQMA

(film

type)

DIODES

Unless

otherwise

specifid

AGAINST

RISK

OF

FIRE,

REPLACE

ONLY

WITH

SAME

TYPE

ANO

RATINGS

ONLY.

|

1086

nee

A

A1S2

AKFI1E

KN104

NF

1084

CSA

AC125)

ORD

Cc

NEUTRAL]

(4scH-1)

ADK7039

2

[>

:AUDIO

SIGNAL

(REAR)

diodes

shall

be

HSS104-02

RY151

RELAY

for

AC

OUTPUT

;

i

aA,

CONTROL

We

oO

CAUTION:

FOR

CONTINUED

PROTECTION

B49

2

Ma

zaw

AGAINST

RISK

OF

FIRE,

AF

ASSY

(RWZ

3686)

Oo

KN1S1

REPLACE

WITH

SAME

TYPE

Ne

ges

NO.

1CP-NSO,

MFD

BY

ROHM

CoO.,

LTD.FOR

1€151-1C154.

eee)

CER

8

a

ee

|

SP-L-A+B

OUT

PETA

ET]

eee

|

a

eK

ww

AC

+10V

(OC)

|

ASSY

SP-L-A+B

OUT

Mca

4h

4

ovo7$

|

(RWZ

3692)

SP-L_

IN

174

A106

cuz

]

SP-L

IN

188

10480

0106

§

SP-L-A

OUT

var

seivioc]

|

OUT

ACH124

9.

OsSB20F

Aco

|

stain.

L

)

:

GND

a

{

a

GND

\

)

GND

an

d

©}

7.5

[|

Be

i]

|

>

piozA

|

®

D3SBA20

(8)

_

a

-B1

aX

|

,

-B1

IZn

|

3

er

a,

lew

|

75A11-300-2651

ike

|

0)

arma

||

|

| | |

®

R206

270

|

ah

I

‘

o1o3

A

ER

TRANSFORMER

!

ii0

02SBA20

(8)

7!

RITI307

4

:

Si

i—

aii

a

A

a

SP-R-A

OUT

|®

SP-R-A

GND

|©

mer

ists

=85

-22v

(0c)

SP-R-B

GND

|©

CONTROL

A

|

SP-R-B

OUT

|@

16101

|

a

49

R129

NyM7

0M

6FA

[+5

ev]

|

SP-L-A

OUT

1@

POWER-OFF

_0.5V

aw

c2

|

(9423S

=—

5

-S=

7

-L-A

cia

CN103

aes

See

:

2541046

1750

Pca

009

anT)

009

po--------

--

==

=

a

©

GND

|

@f210

eae

¢205

SP-L-B

OUT

©

UNREG-—

ao

|

(aaee

HEE)

|

ates

!

I

asansis

@}

M.t+12Vv

{

5P202

AKE10121

P

©

Rie

REARAL

OUT,

I

cni02

|

=

DIESE

REO-zEST

|

{

REAR/L

GND

Meri

022

AKT1022

|

REARZR

GNDIO

REAR

GNO

©

RI0

|

I

!

mean

/n

OUrlp

near

oxo

for

|

ape

Toh

eae

ou

|

REAR

OUT

OS

TAIZ

A112

pss

|

Saas

REAR

ouT

|

tH

|

SUPPLY

CONTROL

| I

7

CENTER

SP

OUT

CENTER

GND

Cm

(ar)

al

etal

|

ea

conta

CENTER

GND

|@

ed

aioe

33K

|

sp203

|

CENTER

OUT

O77

|

l

|

AKE1032

|

ere

dh

CENTER

OUT

|@

R109

6BK

|

I

i]

iwaw

J102

|

25c2458

+-——

[|

,

|

valstora

|

I

|

DTSA08=150-2657

|

LH

|

(C303

&

|

!

t

N f

:

!

| |

j

SP

ASSY

(RWZ3690)

|

REGURATOR

ASSY

b—-————-—-———---—

=

L__—------~—

88668000

00000006000O-----

0090000

0000){0000506660+----4060606000|---------------

| |

(RWZ3687)

\

CN104

>

kK,

_AKP7001

CNTO

KP250NA10

CN106

KP2S0NA9

CN107

KPES

Q106,

Q109'M.+12V

POWER

Me

eres

ta

es

ee

|

Ne

N>OZOTOS>2X2AF>EDA

ia)

Zz

SUPPLY

CONTROL

SOON

Oe

=o

ZAN08

8A585

oe

ea

oa)

SOZINSE

OE

APRLSERE

<fC€¢

-G6

-GLO--

Gz-d60

676

Lrao°e

6°

a

560

-aetG6i-4

:

mM

oe

tte

wl

oe

we

-stit+

VU

nut!

+31

n+e

uwtitju+Orr

se:

cog

mut

emery,

ast

wn

>

vlan

;

>uL>

rT

O¢g2

YG

w

fe

Ww

2

,

TO

TUNER

CONTROL

AMP

TO

FRONT

ASSY

TO

REAR

ASSY

TO

REAR

ASSY

(CX-790,

CX-770S)

CN7502

(@SCH-3)

CN7102

(>

SCH—-4)

J7101

(@®SCH-4)

AF

ASSY,

REGURATOR

ASSY,

H.P.ASSY,

LED

ASSY,

SP

ASSY,

POWER

SW

ASSY,

SECONDARY

ASSY,

PRIMARY

ASSY

AF

ASSY,

REGURATOR

ASSY,

H.P.ASSY,

LED

ASSY,

SP

ASSY,

POWER

SW

ASSY,

SECONDARY

ASSY,

PRIMARY

ASSY

SCH-2

11

N

=

_]

SP

ASSY

Reie

cees

Otho

TO

AF

ASSY

CN102

TO

AF

ASSY

CN101

H.P.

ASSY

SPR

IN

|

NE

M

PFe

889SZMuY

ASSU

“d°H

LED

ASSY

LED

ASSY

RWZ3689

fPono

Pperonty

}

se@e0

NE

M

PF2

M-790

NOTE

FOR

PCB

DIAGRAMS:

1.

ee

ae

nee

es

2.

A

omsenséd

bedlioana

ah

pan

nOBend

schematic

diagrams

is

shown

below.

Symbol

in

Schematic

Diagrams

BceEBCE

Transistor

with

resistor

Field

effect

transistor

Resistor

array

3-terminal

regulator

TO

AF

ASSY

CN110

RNP

1644-B

e

This

diagram

is

viewed

from

the

mounted

parts

side.

e

The

parts

mounted

on

this

PCB

include

all

necessary

parts

for

several

destinations.

For

further

information

for

respective

destinations,

be

sure

to

check

with

the

schematic

diagram.

at

;

2

13

|

3

Pioneer M-790 User manual

Popular Amplifier manuals by other brands