Pioneer M-790 User manual

Service

ORDER

NO.

RRV1465

STEREO

POWER

AMPLIFIER

M-790

THIS

MANUAL

APPLICABLE

THE

FOLLOWING

MODEL(S)

AND

TYPE(S).

This

product

system(s)

component.

This

product

does

not

function

properly

when

independent;

avoid

malfunctions,

sure

connect

the

prescribed

system

component(s),

otherwise

damage

may

result.

CONTENTS

SAFETY

INFORMATION

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PACKING,

EXPLODED

VIEWS

AND

PARTS

LIST

......

SCHEMATIC

AND

PCB

CONNECTION

DIAGRAMS

...

PCB

PARTS

LIST

«..ccccceccssscscsstvessecscececscensesnccesesscasceescs

ADJUSTMENTS.

.........c0c

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HOW

CHECK

M-790

1.0.0...

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BLOCK

DIAGRAN

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

PANEL

FACILITIES

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SPECIFICATIONS

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PIONEER

ELECTRONIC

CORPORATION

4-1,

Meguro

1-Chome,

Meguro-ku,

Tokyo

153,

Japan

PIONEER

ELECTRONICS

SERVICE,

INC.

P.0.Box

1760,

Long

Beach,

90801-1760,

U.S.A.

PIONEER

ELECTRONIC

[EUROPE]

N.V.

Haven

1087,

Keetberglaan

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

Japan

M-790

SAFETY

INFORMATION

This

service

manual

intended

for

qualified

service

technicians;

not

meant

for

the

casual

do-it-yourselfer.

Qualified

technicians

have

the

necessary

test

equipment

and

tools,

and

have

been

trained

properly

and

safely

repair

complex

products

such

those

covered

this

manual.

Improperly

performed

repairs

can

adversely

affect

the

safety

and

reliability

the

product

and

may

void

the

warranty.

you

are

not

qualified

perform

the

repair

this

product

properly

and

safely,

you

should

not

risk

trying

and

refer

the

repair

qualified

service

technician.

WARNING

Lead

solder

used

this

product

listed

the

California

Health

and

Welfare

agency

known

reproductive

toxicant

which

may

cause

birth

defects

other

reproductive

harm

(California

Health

Safety

Code,

Section

25249.5).

When

servicing

handling

circuit

boards

and

other

components

which

contain

lead

solder,

avoid

unprotected

skin

contact

with

the

solder.

Also,

when

soldering

not

inhale

any

smoke

fumes

produced.

NOTICE

(FOR

CANADIAN

MODEL

ONLY)

Fuse

symbols

-#&—

(fast

operating

fuse)

and/or

-§&—®

(slow

operating

fuse)

PCB

indicate

that

replacement

parts

must

identical

designation.

REMARQUE

(POUR

MODELE

CANADIEN

SEULEMENT)

Les

symboles

fusible

-————H

(fusible

type

rapide)

et/ou

-§&—®

(fusible

type

lent)

sur

CCI

indiquent

que

les

piéces

remplacement

doivent

avoir

méme

désignation.

(FOR

USA

MODEL

ONLY)

1.SAFETY

PRECAUTIONS

The

following

check

should

performed

for

the

ANY

MEASUREMENTS

NOT

WITHIN

THE

LIMITS

OUTLINED

ABOVE

ARE

INDICATIVE

PO-

continued

protection

the

customer

and

service

technician.

LEAKAGE

CURRENT

CHECK

Measure

leakage

current

known

earth

ground

(water

pipe,

conduit,

etc.)

connecting

leakage

current

tester

such

Simpson

Model

229-2

metal

parts

the

appliance

(input/output

terminals,

screwheads,

metal

overlays,

control

shaft,

etc.).

Plug

the

line

cord

the

appliance

directly

into

120V

60Hz

outlet

and

turn

the

power

switch

on.

Any

current

measured

must

not

exceed

0.5mA.

Leakage

current

tester

Reading

should

not

above

0.5mA

Test

all

exposed

metal

surfaces

Also

test

with

plug

reversed

(Using

adapter

plug

required)

Leakage

Test

equivalent

between

the

earth

ground

and

all

exposed

TENTIAL

SHOCK

HAZARD

AND

MUST

COR-

RECTED

BEFORE

RETURNING

THE

APPLIANCE

THE

CUSTOMER.

2.PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

parts

the

appli-

ance

have

special

safety

characteristics.

These

are

often

not

evident

from

visual

inspection

nor

the

protection

afforded

them

necessarily

can

ob-

tained

using

replacement

components

rated

for

vol-

tage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

this

Service

Manual.

Electrical

components

having

such

features

are

identified

marking

with

the

schematics

and

the

parts

fist

this

Service

Manual.

The

use

substitute

replacement

component

which

dose

not

have

the

same

safety

characteristics

the

PIONEER

recommended

replacement

one,

shown

the

parts

list

this

Service

Manual,

may

create

shock,

fire,

other

hazards.

Product

Safety

continuously

under

review

and

new

instructions

are

issued

from

time

time.

For

the

latest

information,

always

consult

the

current

PIONEER

Service

Manual.

subscription

to,

ad-

ditional

copies

of,

PIONEER

Service

Manual

may

obtained

nominal

charge

from

PIONEER.

PACKING,

EXPLODED

VIEWS

AND

PARTS

LIST

NOTES:

Parts

marked

"NSP"

are

generally

unavailable

because

they

are

not

our

Master

Spare

Parts

List.

The

mark

found

some

component

parts

indicates

the

importance

the

safety

factor

the

part.

Therefore,

when

replacing,

sure

use

parts

identical

designation.

Parts

marked

"@"

are

not

always

kept

stock.

Their

delivery

time

may

longer

than

usual

they

may

unavailable.

2.1

PACKING

Parts

List

Mark

No.

Description

Parts

No.

NSP

WARRANTY

CARD

(KUXJ

TYPE

ONLY)

ARY1051

NSP

WARRANTY

CARD

(KCXJ

TYPE

ONLY)

ARY1075

OPERATING

INSTRUCTIONS

RRB1167

(ENGLISH)

OPERATING

INSTRUCTIONS

RRC1005

(FRENCH)(KCXJ

TYPE

ONLY)

NSP

POLYETHYLENE

BAG

AHG1202

PACKING

SHEET

AHG7008

REAR

PAD

AHA1666

FRONT

PAD

AHA1665

PACKING

CASE

RHG1708

2.2

POWER

AMP.

UNIT

SECTION

Notes

NOTE

Screws

adjacent

mark

Ensure

that

silicon

grease

does

not

adhere

the

MOLD

product

are

used

for

disassembly.

(No.

and

MOLD

(No.

7).

Parts

List

Mark

No.

Description

Parts

No.

Mark

No.

Description

Parts

No.

FRONTASSY

RWZ3697

TRANSISTOR

(Q13)

2SA

1837

REAR

ASSY

RWZ3698

17.

TRANSISTOR

(Q14)

2SA

1837

HEAT

SINK

ANH7008

TRANSISTOR

(Q53)

2SA

1837

BRACKET

RNE1881

TRANSISTOR

(Q54)

2SA

1837

MICA

SHEET

REE1029

TRANSISTOR

(Q17)

2SC3181N

MOLDA

AMR7005

TRANSISTOR

(Q18)

2SC3181N

MOLDB

AMR7006

TRANSISTOR

(Q57)

2SC3181N

SCREW

(3x10)

ABAI021

23.

TRANSISTOR

(Q58)

2SC3181N

SCREW

BBZ30P140FZK

TRANSISTOR

(Q11)

2SC4793

SCREW

BPZ30P350FZK

TRANSISTOR

(Q12)

28C4793

DCFAN

MOTOR

AXM7003

TRANSISTOR

(Q351)

28C4793

12.

TRANSISTOR

(Q15)

2SA1264N

TRANSISTOR

(Q52)

28C4793

13.

TRANSISTOR

(Q16)

28A1264N

14.

TRANSISTOR

(Q55)

2SA1264N

TRANSISTOR

(Q56)

2SA1264N

M-790

2.3

EXTERIOR

See

(KUXJ

type

only)

Refer

"2.2

POWER

AMP.

UNIT

SECTION"

Parts

List

Mark

No.

Description

Parts

No.

NSP

CHASSIS

RNE1874

INSULATOR

ASSY

PNW1912

INSULATOR

ASSY

DXA1490

NSP

PCB

HOLDER

AEC1583

REAR

PANEL

RNA2037

PCB

MOLD

AMR2533

AFASSY

RWZ3686

PCB

SUPPORT

AEC1581

FUSE

(FUISI,

8.0A):

REK1086

SECONDARY

ASSY

RWZ3692

PRIMARY

ASSY

RWZ3772

POWER

AMP.

UNIT

RXQ7024

13.

PUSH

RIVET

AEC7010

POWER

CORD

PDG1015

CORD

STOPPER

AEP

113

SPASSY

RWZ3690

17.

POWER

TRANSFORMER

(T1)

RTT1307

REGURATOR

ASSY

RWZ3687

FRONT

PANEL

RAH2692

POWER

ASSY

RWZ3691

POWER

BUTTON

AAD7064

INDI.

LENS

AAK7075

LED

ASSY

RWZ3689

H.PASSY

RWZ3688

SPEAKER

BUTTON

AAD2416

ILLUMI.

PANEL

RAH2696

27.

NAMEPLATE

PAM1608

BONNET

CASE

ANE1528

29.

SPACER

REB1300

90°

Sei

vaciessy

65LABEL(KUXJTYPEONLY)

ORW1069

SCREW

(3X18)

ABA1018

33.

SCREW

(2.6%8)

ABA1095

34.

SCREW

BBZ30P080FZK

35.

SCREW

BBZ40P080FZK

SCREW

BPZ26PO80FMC

SCREW

VPZ30PO80FZK

BINDER

AEC

826

BINDER

AEP

—

215

SCREW

BBT30P080FZK

M-790

SCHEMATIC

AND

PCB

CONNTCTION

DIAGRAMS

NOTE

FOR

SCHEMATIC

DIAGRAMS

(Type

1A)

When

ordering

service

parts,

sure

refer

"PARTS

LIST

EXPLODED

VIEWS"

"PCB

PARTS

LIST".

Since

these

are

basic

circuits,

some

parts

them

the

values

some

components

may

changed

for

improve

ment.

RESISTORS:

Unit:

k:kQ,

M:MQ,

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%

+5%

un-

less

otherwise

noted.

CAPACITORS:

Unit:

p:pF

unless

otherwise

noted.

Ratings:

capacitor

(uF)/voltage(V)

unless

othrewise

noted.

Rated

voltage:

50V

except

for

electrolytic

capacitors.

COILS:

Unit:

m:mH

unless

otherwise

noted.

VOLTAGE

AND

CURRENT:

Signal

voltage

rated

output.

ore

voltage

(V)

input

signal

unless

otherwise

noted.

Value

( )

voltage

rated

power.

—

mA:

current

input

signal

unless

otherwise

noted.

OTHERS:

or@

Adjusting

point.

Measurement

point.

The

mark

found

some

component

parts

indicates

the

im-

portance

the

safety

factor

the

parts.

Therefore,

when

re-

placing,

sure

use

parts

identical

designation.

SCH-C

THE

SCHEMATIC

DIAGRAM:

SCH-C

indicates

the

drawing

number

the

schematic

dia

gram.

(SCH

stands

for

schematic

diagram.)

SWITCHES

(Underline

indicates

switch

position):

H.P

ASSY

$201

SPEAKERS(A

A+B)

—I

3.1

OVERALL

WIRING

DIAGRAMS

fave

east

(RWZ

3688)

(~SCH-2)

REAR

CENTER

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

SP—R-A

OUT

SP-R-A

OUT

CN210

GND

CN110

TUNER

CONTROL

AMP.

FRONT

ASSY

POWER

AMP.UNIT

(RXQ7024)

(=SCH

(RW23697)

—3)

(}/POWER

(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

ASS

(RWZ

3691)

(+SCH-2)

P155

CHASSIS

ASSY

(RWZ

3686)

(~SCH—2)

CN109

OOO

@QVODNDOoWOWO

CHASSIS

(RWZ

3687)

(-=SCH-2)

(RWZ

3698)

(>~SCH-4)

NEUTRAL

POWER

CORD

PDG1

01S

AC120V

60Hz

POWER

TRANSFORMER

RTT1307

CN153

REGURATOR

ASSY

OVERALL

WIRING

DIAGRAMS

SCH-1

M-790

3.2

AF,

REGURATOR,

H.P.,

LED,

SP,

POWER

SW,

SECONDARY

AND

PRIMARY

ASSEMBLIES

SIGNAL

ROUTE

-AUDIO

SIGNAL

(FRONT)

[POWER

ASSY

(RWZ3691)

P156

—

oscacas,

accios4

swiS4

Aaso-sss

|p455

RDX1014

————

tetra

i63.

eae

aia

NOTE

Pr}

RESISTORS

ACS

OUTPEL

Indicated

Fuis)

AAIS3

Uniess

otherwise

novedt5%

CAUT1ON:

FOR

CONTINUED

PROTECTION

aie

sare)

LIVE

POWER

Flameproof

type

(RD1/4PMF)

Flameproof

Quick

Open

Type

(RFA1/4PS)

CAPACITORS

Indicated

capacity

(uF)

/vol

tage

(V)

CQMA

(film

type)

DIODES

Unless

otherwise

specifid

AGAINST

RISK

FIRE,

REPLACE

ONLY

WITH

SAME

TYPE

ANO

RATINGS

ONLY.

1086

nee

A1S2

AKFI1E

KN104

1084

CSA

AC125)

ORD

NEUTRAL]

(4scH-1)

ADK7039

:AUDIO

SIGNAL

(REAR)

diodes

shall

HSS104-02

RY151

RELAY

for

OUTPUT

;

aA,

CONTROL

CAUTION:

FOR

CONTINUED

PROTECTION

B49

zaw

AGAINST

RISK

FIRE,

ASSY

(RWZ

3686)

KN1S1

REPLACE

WITH

SAME

TYPE

ges

NO.

1CP-NSO,

MFD

ROHM

CoO.,

LTD.FOR

1€151-1C154.

eee)

CER

SP-L-A+B

OUT

PETA

ET]

eee

+10V

(OC)

ASSY

SP-L-A+B

OUT

Mca

ovo7$

(RWZ

3692)

SP-L_

174

A106

cuz

]

SP-L

188

10480

0106

SP-L-A

OUT

var

seivioc]

OUT

ACH124

OsSB20F

Aco

stain.

)

GND

{

GND

)

GND

©}

7.5

piozA

D3SBA20

(8)

-B1

IZn

lew

75A11-300-2651

ike

arma

| | |

R206

270

‘

o1o3

TRANSFORMER

ii0

02SBA20

(8)

RITI307

i—

aii

SP-R-A

OUT

|®

SP-R-A

GND

|©

mer

ists

=85

-22v

(0c)

SP-R-B

GND

|©

CONTROL

SP-R-B

OUT

16101

R129

NyM7

6FA

[+5

ev]

SP-L-A

OUT

POWER-OFF

_0.5V

(9423S

=—

-S=

-L-A

cia

CN103

aes

See

2541046

1750

Pca

009

anT)

009

po--------

GND

@f210

eae

¢205

SP-L-B

OUT

UNREG-—

(aaee

HEE)

ates

asansis

M.t+12Vv

{

5P202

AKE10121

Rie

REARAL

OUT,

cni02

DIESE

REO-zEST

{

REAR/L

GND

Meri

022

AKT1022

REARZR

GNDIO

REAR

GNO

RI0

mean

OUrlp

near

oxo

for

ape

Toh

eae

REAR

OUT

TAIZ

A112

pss

Saas

REAR

ouT

SUPPLY

CONTROL

| I

CENTER

OUT

CENTER

GND

(ar)

etal

conta

CENTER

GND

aioe

33K

sp203

CENTER

OUT

O77

AKE1032

ere

CENTER

OUT

R109

6BK

iwaw

J102

25c2458

+-——

valstora

DTSA08=150-2657

(C303

N f

| |

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

eres

N>OZOTOS>2X2AF>EDA

ia)

SUPPLY

CONTROL

SOON

ZAN08

8A585

oa)

SOZINSE

APRLSERE

<fC€¢

-G6

-GLO--

Gz-d60

676

Lrao°e

6°

560

-aetG6i-4

tte

-stit+

nut!

+31

n+e

uwtitju+Orr

se:

cog

mut

emery,

ast

vlan

;

>uL>

O¢g2

TUNER

CONTROL

AMP

FRONT

ASSY

REAR

ASSY

REAR

ASSY

(CX-790,

CX-770S)

CN7502

(@SCH-3)

CN7102

SCH—-4)

J7101

(@®SCH-4)

ASSY,

REGURATOR

ASSY,

H.P.ASSY,

LED

ASSY,

POWER

ASSY,

SECONDARY

ASSY,

PRIMARY

ASSY

ASSY,

REGURATOR

ASSY,

H.P.ASSY,

LED

ASSY,

POWER

ASSY,

SECONDARY

ASSY,

PRIMARY

ASSY

SCH-2

ASSY

Reie

cees

Otho

ASSY

CN102

ASSY

CN101

H.P.

ASSY

SPR

PFe

889SZMuY

ASSU

“d°H

LED

ASSY

LED

ASSY

RWZ3689

fPono

Pperonty

}

se@e0

PF2

M-790

NOTE

FOR

PCB

DIAGRAMS:

nee

omsenséd

bedlioana

pan

nOBend

schematic

diagrams

shown

below.

Symbol

Schematic

Diagrams

BceEBCE

Transistor

with

resistor

Field

effect

transistor

Resistor

array

3-terminal

regulator

ASSY

CN110

RNP

1644-B

This

diagram

viewed

from

the

mounted

parts

side.

The

parts

mounted

this

PCB

include

all

necessary

parts

for

several

destinations.

For

further

information

for

respective

destinations,

sure

check

with

the

schematic

diagram.

;

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