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

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some

component

parts

indicates

the

importance

of

the

safety

factor

of

the

part.

Therefore,

when

replacing,

be

sure

to

use

parts

of

identical

designation.

©

Parts

marked

by

"@"

are

not

always

kept

in

stock.

Their

delivery

time

may

be

longer

than

usual

or

they

may

be

unavailable.

©

When

ordering

resistors,

first

convert

resistance

values

into

code

form

as

shown

in

the

following

examples.

Ex.1

|

When

there

are

2

effective

digits

(any

digit

apart

from

0),

such

as

560

ohm

and

47k

ohm

(tolerance

is

shown

by

J

=

5%,

and

K

=

10%).

56002

>

56X10!

47kQ

>

47X10

0.52

aa

12

aaa

9:

SOD

iscksviassiiiels

ciansivenn

aecastoh

hinge

ietiovier

ois

SP

BIS

i

codes

cev

veces

dadineeeveten

win

exa

ou

idbesuteebhcetivws

Ex.2

When

there

are

3

effective

digits

(such

as

in

high

precision

metal

film

resistors).

5.62k2

7

562X110!

Mark

No.

Description

Parts

No.

LIST

OF

ASSEMBLIES

NSP

MAIN

ASSY

RWMI861

AF

ASSY

RWZ3686

REGURATOR

ASSY

RWZ3687

HP.

ASSY

RWZ3688

LED

ASSY

RWZ3689

SP

ASSY

RWZ3690

POWER

SW

ASSY

RWZ3691

SECONDARY

ASSY

RWZ3692

PRIMARY

ASSY

RWZ3772

POWER

AMP.

UNIT

RXQ7024

FRONT

ASSY

RWZ3697

REAR

ASSY

RWZ3698

MAIN

ASSY

OTHERS

Y154

BOARDIN

READ

WIRE

—_-RDX1014

Y153

BOARDIN

READ

WIRE

_

RDX1015

AF

ASSY

SEMICONDUCTORS

A

iciol

NJM78MS56FA

Q102,

Q105

2SA1048

Q103,

Q108

2SA1515

Q104,

Q109

28C2458

QI06

28C3377

Q107

DTAI24ES

D103

D2SBA20(B)

D102

D3SBA20(B)

DIO!

DS5SB20F

D104

—

D107,

D15)

HSS104

—

02

D108

MTZJ7.5B

RELAY

A

sRYISI

ASR1027

23

SP

DODD

i

aisseaiecis

hecho

disease

clk

asisbvost

ee

cageet

RDIAPUGI6J

RDI/AAPULAIZB|S

RN2H(ORGE)K

RSIP(I|RIOK

RNI/4PCEI6]21)F

Mark

No.

Description

Parts

No.

CAPACITORS

A\

C152,

C154

(0.01pF/AC400V)

ACG1054

C103,

C104

(4700pF/DC63V)

ACHI249

C115

CEANP470M25

C114

CEAS010MS50

C112

CEAS100MS50

Cill

CEAS102M35

C110

CEAS222M35

C3

CEAS331M6R3

C171

-C174

CFTXA104J50

C109

CQMA103K250

A

c101,

€105

CQMA473K250

C107,

C108

(3300pF/DCSOV)

RCHI129

RESISTORS

A

RISI

(2.2MQ,

1/2W)

ACN

-

208

R173,

R174

RD1/4PMF7R5J

A

R123,

R124

RFA1/4PS100)

R105

RSILMF1823

R129

RS1LMF470J

R103,

R104

RS2LMFR22J

R101,

R102

RS3LMFR22J

Other

Resistors

RD1/44PU000)

OTHERS

SPEAKER

TERMINAL

8—P

AKE

-

111

A

AC

OUTLET

3P

AKP1053

SOCKET(19P)

AKP7001

CABLE

HOLDER

AKT1007

CN105

10P

SOCKET

KP250NA10

CN106

9P

SOCKET

KP250NA9

CN107

CONNECTOR(8P)

KPE8

PCB

BINDER

VEF1040

KNIO1,

KNIS1

EARTH

METAL

FITTING

VNFI1084

REGURATOR

ASSY

SEMICONDUCTORS

1C301,

IC302

1C303

NJM7812FAS

NJM79M12FA

Mark

No.

Description

Parts

No.

CAPACITORS

C305

CEAS010M50

C301

—

C303,

C306

CEAS100M50

RESISTOR

R301

RSILMF2R2J

H.P.

ASSY

SWITCH

$201

PUSH

SWITCH

SULLXS

CAPACITOR

C201

CKCYF473Z50

RESISTORS

R201

-

R204

RS2LMF681J

OTHERS

AKNI025

LED

ASSY

SEMICONDUCTORS

D201

-

D206

AEL1065

SP

ASSY

CAPACITORS

C202

-

C205

CQMA104J50

RESISTORS

R209,

R210

RD1/4PMF7RS5J

OTHERS

SPEAKER

TERMINAL4-P

AKEI012

SPEAKER

TERMINAL2-P

AKE1032

POWER

SW

ASSY

SWITCH

A

sis

PUSH

SWITCH

ASG

-

553

CAPACITOR

C153

(0.01F/AC400V)

ACG1054

SECONDARY

ASSY

SEMICONDUCTORS

IC151

—1C154

ICP

-

N50

OTHERS

CABLE

HOLDER

AKT1007

PRIMARY

ASSY

OTHERS

Y152

BOARDIN

READ

WIRE

ADX7039

Y151

BOARDIN

READ

WIRE

ADX7043

FRONT

ASSY

SEMICONDUCTORS

IC7501

UPC4570G2(5)

Q7507,

Q7508

2SA1182

Q7401

2SA1255

Q7501,

Q7502

2SC2240

Q7505,

Q7506

28C2859

24

Mark

No.

Description

Parts

No.

Q7403,

Q7405

D7505,

D7506,

D7517,

D7518

D7503, D7504,

D7516

D7535

—

D7538

D7521

-

D7524

D7519,

D7520,

D7525,

D7526,

D7531

D7533

D7507

—

D7510

CAPACITORS

C7519

—

C7522,

C7545

—

C7552

C7525

—

C7528

C7503,

C7504

C7541,

C7542

C7523,

C7524

C7509,

C7510

C7540

C7419

C7539

C7405

C7529

-

C7532

C7543,

C7544

C7401,

C7403

C7537

RESISTORS

A

>

RP

BBP

R7515,

R7516

(1.8kQ,

1/10W)

R7541,

R7542

R7519,

R7520

R7529

—

R7536

R7547

—

R7550

R7853

R7537

—

R7540

R7553

R7543,

R7544

Other

Resistors

OTHERS

CN7502

10P

PLUG

REAR

ASSY

SEMICONDUCTORS

1C7201

IC7101

Q7605,

Q7606

Q7204

Q7107,

Q7108

Q7601

Q7301,

Q7302

Q7101,

Q7102

Q7202,

Q7203

Q7105,

Q7106

Q7603,

Q7604

Q7607

D7105, D7106,

D7117,

D7118

D7103,

D7104, D7116,

D7204,

D7212

D7135

-

D7138

28C3138

188181

188184

188226

188244

HSS104

-

02

HSS104

—

02

RD3.3ESB2

CCSQCH101550

CCSQCH27

1350

CCSQCH33

1550

CCSQCH470350

CEALR

10MS50

CEAS101M10

CEJA3R3M50

CEJA470M

16

CEJA4R7M50

CKSQYB104K25

CKSQYB333K50

CKSQYB472K50

CKSQYF104Z50

CKSQYF473Z50

ACNI1107

RD1/4PMF100J)

RN1/10SE621D

RSI/10S101J

RS1/10S2200F

RS1/8S000)

RS1/8S100)

RS1/8S101J

RS1/8S7R5J

RS1/10SD0CJ

KM2S0NAI0L

PAC006C

UPC4570G2

2PD601A

2SA1162

2SA1182

2SA1255

28C1815

28C2240

28C2712

2SC2859

25C3138

DTA124EK

1SS181

188184

1S8$226

Mark

No.

Description

Parts

No.

D7121

—

D7124

D7119,

D7120,

D7125,

D7126,

D7131

D7133,

D7205,

D7208

D7210

D7107

—

D7110

D7206,

D7211

D7207

CAPACITORS

C7204

(1pF/DC16V)

C7119

—

C7122,

C7145

—

C7152

C7125

—

C7128

C7103,

C7104

C7141,

C7142

C7220

C7123,

C7124

C7202

C7109,

C7110

C7205

C7140

C7139

C7203

C7201, C7208,

C7219,

C7697

C7301

C7129

—

C7132

C7143,

C7144

C7206, C7215, C7216,

C7601,

C7603

C7698

C7137

RESISTORS

R7115,

R7116

(1.8kQ,

1/10W)

AN

R7141,R7142

R7119,

R7120

R7129

—

R7136

R7147

—

R7150

R7623,

R7753,

R7759,

R7760

R7137

~

R7140

R7153

R7145

R7143,

R7144

Bs

iB.

ee

VR7201

(22kQ,

0.1

W)

Other

Resistors

OTHERS

CN7102

9P

PLUG

PCB

BINDER

188244

HSS

104

-

02

HSS104

-

02

RB441Q

—

40

RD3.3ESB2

RD4.7ESB

RDS.6ESB2

ACGI1051

CCSQCH101350

CCSQCH271J50

CCSQCH33

1550

CCSQCH470J50

CEAL010MS50

CEALR1OMS0

CEANL4R7MS0

CEAS101M10

CEJA221M10

CEJA3R3M50

CEJA4R7M50

CEJAR33M50

CKSQYB103K50

CKSQYB332K50

CKSQYB333K50

CKSQYB472K50

CKSQYF104Z50

CKSQYF473Z50

ACN1107

RD1/4PMF100)

RN1/10SE621D

RSI/10S101J

RS1/10S2200F

RS1/8S000J

RS1/8S100J

RS1/8S101J

RS1/8S223]

RSI/8S7R5J

RCP1103

RS1/10S0003

KM2S50NA9L

VEF1040

M-790

25

M-790

5.

ADJUSTMENTS

POWER

AMP.

UNIT

SECTION

(Refer

to

Fig.

1.)

5.1

Handling

Precautions

@

Since

the

heat

sink

and

transistor

metallic

parts

are

connected

to

the

Front

Amp

output,

make

sure

they

do

not

contact

the

GND

(chassis)

or

other

circuits.

@

Since

there

is

residual

high

voltage

in

the

Power

Amp

Module

Assy

+B]

(FRONT

ASSY)

and

+B2

(REAR

ASSY)

even

when

the

power

is

OFF,

caution

should

be

exercised.

(If

necessary,

the

voltage

should

be

discharged).

@

When

handling

the

Power

Amp.

UNIT,

make

sure

you

do

not

touch

the

fan

motor

blade.

CAUTION

:

5.2

Adjustment

and

Confirmation

of

Idle

Current

@

Basically,

the

idle

current

needs

to

be

confirmed

when

replacing

a

power

transistor,

driver

transistor,

or

bias

transistor,

or

when

the

entire

split

board

Assy

of

the

Power

Amp.

UNIT

has

been

replaced.

@

Make

sure

the

heat

sink

has

cooled

sufficiently

before

measuring

the

idle

current.

(Temperature

should

be

the

same

as

room

tem-

perature;

25°C

is

ideal,

if

possible.)

@

Idle

current

stipulated

value:

3

-

5OmA.

Before

performing

this

adjustment,

short

the

blow

trigger

shorting

(shown

in

Fig.

2)

of

the

FRONT

ASSY

to

prevent

the

protection

IC

from

malfunction.

After

adjustment

is

completed,

remove

the

short-circuit.

@

Front

Amp

Side

(FRONT

ASSY)

Rch

side

following

procedure.

|

Measurement

|

tem

Short

both

sides

of

C7123

and

C7124

on

the

Rear

Amp

side.

Do

not

operate

the

Rear

Amp

side.

Lch

side

Insert

a

resistor

(0.22Q,

3W

or

more)

in

series

in

the

connector

CN7502

+B1

(or

—B1)

line

(terminal

No.5

or

6).

(Refer

to

Fig.3)

Short

both

sides

of

C7524.

Do

not

operate

Rch

side.

Tum

oe

power

ON,

wait

6

seconds,

and

then

measure

the

resistance

Leh

Idle

current

1=V/0.22

(Q)

voltage

in

Step

2.

@

Same

as

Steps

|

and

2

above.

,

@

Short

both

sides

of

C7523,

Do

not

operate

Lh

side.

Tum

the

power

ON

under

the

above

conditions,

and

after

6

seconds

measure

the

resistance

voltage

in

Step

2.

If

the

measured

idle

current

is

greater

than

S0mA,

perform

the

For

measuring

voltage

at

both

sides

of

resistor.

confirm

that

it

is

below

SOmA.

Short

between

the

Point

@)

pattern

in

Fig.4

using

solder.

Short

between

the

Point

®

pattern

in

Fig.4

using

solder.

After

performing

Steps

8

and

9,

remeasure

the

idle

current

and

26

If

the

idle

current

is

below

3mA,

perform

the

following

procedure.

Short

between

the

Point

©

pattern

in

Fig.4

using

solder.

Short

between

the

Point

©

pattern

in

Fig.4

using

solder.

After

performing

Steps

12

and

13,

remeasure

the

idle

current

and

confirm

that

it

is

greater

than

3mA

(within

3

—

5OmA).

Connect

R7517

to

R7515

in

a

parallel

circuit.

Connect

R7518

to

R7516

in

a

parallel

circuit.

Connect

R7551

to

R7519

in

a

parallel

circuit.

Connect

R7552

to

R7520

in

a

parallel

circuit.

M-790

@

Rear

Amp

Side

(REAR

ASSY)

Step

Measurement

Short

both

sides

of

C7523

and

C7524

on

the

Front

Amp

side.

Do

not

operate

the

Front

Amp

side.

Insert

a

resistor

(0.22Q,

3W

or

more)

in

series

in

the

connector

For

measuring

voltage

at

both

sides

of

resistor.

CN7102

+B2

(or

—B2)

line

(terminal

No.4

or

5).

(Refer

to

Fig.5)

Do

not

operate

the

Surround

Amp.

are

Nene

|

via

nit

ini

ea

Surround

amp

side

:

a

If

the

measured

idle

current

is

greater

than

50mA,

perform

the

following

procedure.

:

: ;

Connect

R7117

to

R7115

in

a

parallel

Short

between

the

Point

©

pattern

in

Fig.6

using

solder.

Surround

amp

side]

Short

between

the

Point

©

pattern

in

Fig.6

using

solder.

piel

RUSS

pare

After

performing

Steps

8

and

9,

remeasure

the

idle

current

and

confirm

that

it

is

below

50mA.

Center

amp

side

——a

If

the

idle

current

is

below

3mA,

perform

the

following

procedure.

Short

between

the

Point

©

pattern

in

Fig.6

using

solder.

a

i

Surround

amp

side]

Short

between

the

Point

@

pattern

in

Fig.6

using

solder.

rs

R7152

to

R7120

in

a

parallel

circuit.

After

performing

Steps

12

and

13,

remeasure

the

idle

current

and

confirm

that

it

is

greater

than

3mA

(within

3

—

50mA).

nN

V+81

71

REAR

ASSY

FRONT

ASSY

(Front

Amp

Side)

iS

i

eo

aa

2

See

S38

eR

2

6

-

Te

rT

|

a

2

|

tT

CN7504

a

—

|

AKC=318

BLOW

TRIG

U//

REAR

ASSY

(Rear

Amp

Side)

28¢31

38-07"

Short

R7405

prs

|

4.

c74q

0

ve

2

Fig.

1

POWER

AMP.

UNIT(RXQ7024)

Fig.

2

BLOW

TRIGGER

CIRCUIT

27

Pioneer M-790 User manual

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