Onkyo Tx-850 User manual

TX-850

SERIAL

NO.

3292

ONKYO

SERVICE

MANUAL

QUARTZ

SYNTHESIZED

TUNER

AMPLIFIER

MODELS

TX-850/TX-850M

Black

model

BHUD,

BHUDN,

MBHUDN

120V

AC,

60Hz

BHUG

220V

AC,

50Hz

|

BHUQA

240V

AC,

50Hz

BHUW,

MBHUWX

120/220V

AC,

50/60Hz

a

so

J

SAFETY-RELATED

COMPONENT

WARNING!

!

COMPONENTS

IDENTIFIED

BY

MARK

A

ON

THE

SCHEMATIC

DIAGRAM

AND

IN

THE

PARTS

LIST

ARE

CRITICAL

FOR

RISK

OF

FIRE

AND

ELECTRIC

SHOCK.

REPLACE

THESE

COMPO-

NENTS

WITH

ONKYO

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL.

MAKE

LEAKAGE-CURRENT

OR

RESISTANCE

MEASUREMENTS

TO

DETERMINE

THAT

EXPOSED

PARTS

ARE

ACCEPTABLY

INSULATED

FROM

THE

SUPPLY

CIRCUIT

BEFORE

RETURNING

THE

APPLIANCE

TO

THE

CUSTOMER,

ONKYO

AUDIO

COMPONENTS

SPECIFICATIONS

AMPLIFIER

SECTION

Power

output

Musical

Power

Output

Continuous

Power

Output.

Total

Harmonic

Distortion:

IM

Distortion:

Damping

Factor:

Frequency

Response:

RIAA

Diviation:

Sensitivity

and

Impedance:

Phono

Overload(MM);

Signal-to-

Noise

Ratio;

Tone

controls:

TUNER

SECTION

FM:

‘Tuning

Range:

Usable

Sensitivity:

50dB

Quieting

Sensi

Capture

Ratio

Image

Rejection

Ratio:

IF

Rejection

Ratio:

Signal-to-

Noise

Ratio:

Alternate

Channel

Attenuation:

Selectivity

AM

suppression

Ratio:

Harmonic

Distortion:

Frequency

Response:

Stereo

Separation:

Mating

Level:

AM:

Tuning

Range:

Usable

Sensitivity:

Image

Rejection

Ratio:

IF

Rejection

Ratio:

Signal

to-

Noise

Ratio:

Harmonie

Distortion:

GENERAL

Dimensions(W

*

HD):

Weight:

68

watts

per

channel,

min,

RMS,

at

80hms.

both

channels

driven.from

20Hz

to

20kHz,

with

no

more

than

0.04"

total

harmonic

distortion.

2x175

watts

at

4

ohms,

1kHz

(DIN)

2110

watts

at

8

ohms,

1kHz

(DIN)

2100

watts

at

4

ohms,

1kHz

(DIN)

2x75

watts

at

8

ohms,

1kHz

(DIN)

0.04%

at

rated

power

0.04%

at

1

watts

output

0.04%

at

rated

power

0.04%

at

1

watts

output

40

at

8

ohms

20-30,000Hz

+1dB

20

O00Hz

+0.8dB

Phono:

"/50

kohms

cD:

30

kohms

Tape

Play:

30.

kohms

Tape

Rec:

kohms

120mV

RMS

at

1kHz,

0.04%

THD.

Phono:

85dBiat

10mV

input,

A

weighted)

T5dBUIHF

A-202)

CD/Tape:

95dBtA

weighterd)

80dBUHF

A-202)

Bass:

+10dB

at

100Hz

Treble:

+10dB

at

1l0kHz

~220V/240v/

pang

models~

steps)

or

‘KN

T5ohms

0.9

wV(SEN

26dB40kHz

Devid

75ohms

DIN

18.0dBf,2.2

4¢V,750hms

N

46dB40kHz

Devi.)

75ohms

DIN

Mono:

18.0dBE2.2

WV

Stereo:

372d

Bi

20pV,

1.5dB

85dB

90dB,

Mono:

Stereo:

50dB

DIN(

+300KHz40kHz

dev)

50dB.

Mono:

0.15%

Stereo:

0.25%

30

15,000Hz

+1.5dB

45dB

at

1k

30dB

at

100

10,000Hz

17.2dBf,

4.0¢V

16KHA

9kHz

steps)

522

1611kHz(

9kHz

steps)

or

530.

1620kHZ(10KHz

steps)

(Worldwide

model)

300

40aB

s0aB,

svdB

0.7%

435

130

*

351mm

17-1/8"

5-1/8"

X13-13/16"

askg.

19.4lbs.

-120V

model-

-107.9kHz(200kHz

steps)

Mono:

10.8dBE19¢V

Stereo:

17.2dBi4.0

pV

Mono:

172dBi40

pV

Stereo:

37.2dBiA0uV

1.5dB

40dB.

40dB

Mono;

Stereo:

5odB

50dB

Mono:

Stereo:

30

15,000H2

+1

5a

dodB

at

kHz

30dB

at

100°

10,000Hz

17.2dBf.

4.02V

030°

1620kH2(10kHz

steps)

30nV

40dB

4udB

40dB

0.7%

REMOTE

CONTROL

TRANSMITTER

RC-119S/RC-118S

‘Transmitter:

Infrared

Signal

range:

Approx.

Smeters(16ft.4")

Power

supply:

TWO

"AA”

batteries

(1.5V

*2)

Dimensions(W

*

HD):

64*

18

176mm

2-1/2"

x3/4"

x

7"

Weight:

M0grams

5.00z{including

batteries)

Specifications

and

features

are

subject

to

change

without

notice.

SERVICE

PROCEDURES

1,

Replacing

the

fuses

For

continued

protection

against

fire

hazard,

replace

only

with

same

type

and

same

rating

fuse.

D(120V)

model

Circuit

no.

Partno.

Description

F901

252050

5A

(ST-6),

Primary

G

(220V)

and

Q

(240V)

models

Circuit

no.

Partno.

—

Description

F902

252075

2.5A-SE-EAK,

Primary

F903

252075

2.SA-SE-EAK,

AC

outlet

(Only

220V

model)

F906

252070

1A-SE-EAK,

Secondary

W

(Worldwide)

model

Circuitno.

Partno,

Description

F901

252050

5A

(ST-6),

Primary

F902

252075

—

2.5A-SE-EAK,

Primary

2.

Change

of

FM/AM

band

step.

With

the

exception

of

the

models

below,

a

BAND

STEP

selector

switch

is

not

provided.

(FM)

MODEL

BAND

STEP

|

_D717,J753

R119

UD

200kHz>S50kHz

|

Additional

|

15k2—24kQ

UG/UQ

|

SOkHz+200kHz

|

Eliminated

|

24kQ+15k2

(AM)

BAND

STEP

|

D716,

3754

10kHz+

9kHz

|

Additional

9kH2>10kHz

|

Eliminated

In

D716/7

188133

(Part

No.

223163)

is

used.

In

J753/4,

a

jumper

lead

must

be

inserted.

R119,

with

the

muting

amplitude

determined.

is

on

the

back

panel

side

of

FM/AM

tuner

and

selector

circuit

printed

circuit

board

assembly

test

points

TP-1

and

TP-2.

—

Worldwide

model

—

Worldwide

models

are

equipped

with

a

step

band

selector

switch.

This

switch

is

located

on

the

back

panel.

This

switch

is

set

to

SOkHz

(FM)

and

9kHz

(AM)

at

the

factory,

but

may

have

to

be

reset

to

200kHz

and

10kHz

depending

on

the

area

where

the

unit

is

used.

De-emphasis

FM

step

AM

step

Europe:

50

usec

SOkHz

9kHz

US.A.:

75

psec

200kHz

10kHz

3.

Memory

preservation.

This

unit

does

not

require

memory

preservation

batteries.

A

built-in

memory

power

back-up

system

preserves

contents

of

the

memory

during

power

failures

and

even

when

the

unit

is

unplugged.

The

unit

must

be

plugged

in

BACK

PANNEL

A

F906

FM/AM

TUNER

AND

SELECTOR

CIRCUIT

Pe

BARD

roo

A

rsa

A,

a

e901

£8

POWER

SUPPLY

CIRCUIT

PC

BOARD

DISPLAY

PC

BOARD

and

the

power

switch

turned

on

and

off

once

in

order

to

charge

the

back-up

system.

Note

that

since

this

is

not

a

permanent

memory

the

power

switch

must

be

turned

on

and

off

a

few

times

each

month

to

keep

the

back-up

system

operative.

The

period

of

time

during

which

memory

contents

are

preserved

after

power

has

last

been

turned

off

varies

depending

on

climate

and

placement

of

the

unit.

On

the

average,

memory

contents

are

protected

over

a

period

of

3

to

4

weeks

(a

minimum

of

2

weeks)

after

the

last

time

power

has

been

turned

off.

This

period

is

shorter

when

the

unit

is

exposed

to

very

high

humidity

or

used

in

an

area

with

an

extremely

humid

climate.

4.

Safety-check

out

(Only

U.S.A.

model)

After

correcting

the

original

service

problem

perform

the

following

safety

check

before

releasing

the

set

to

the

customer.

Connect

the

insulating-resistance

tester

between

the

plug

of

power

supply

cord

and

terminal

GND

on

the

back

panel.

Specifications:

3.3

Mohm

+10%

at

S00V.

5.

Change

of

voltage

Worldwide

models

are

equipped

with

a

voltage

selector

to

conform

with

local

power

supplies.

This

switch

is

located

on

the

back

panel.

Be

sure

to

set

this

switch

to

match

the

voltage

of

the

power

supply

in

your

area

before

turning

the

power

switch

on.

This

switch

is

set

to

220V

at

the

factory.

Voltage

is

changed

by

sliding

the

groove

in

the

switch

with

the

screw-

driver

to

the

right

or

left.

Confirm

that

the

switch

has

been

moved

all

the

way

to

the

right

or

left

before

turning

the

power

switch

on.

EXPLODED

VIEW

P902,903

(G/a/w)

EQ

PARTS

LIST

REF.

NO.

PART

NO.

Al

AQ

A3

Ad

AS

AT

AS&

AQ

Alo

All

Al2

AlS

Al4

Al5

Al7

Al’

Ald

A20

A21

A22

A23

A24

A25

A32

Al

Ad2

A43

ADL

ASS:

AS7

A61

A8l

A82

A83

A84

A85,

A86

A87

A88

A89

F901

F902

27100163

27121106

27121107

27121109

27121110

27121111

27141261A

27141262

27160225,

27141263

27141264

27190644

27273098A

28133198A

28130249

27270147

870048

27300750

27190524

834430088

831130088

830440089

834430108

834230108

82143006

82142004

833430080,

271104184

28184394

834430088,

801230

1A091121

833430080

28191466A

27175142

28323241

28323361

28323363

28323365A.

28323310

28322925,

28323367

27190647

28323369

252050

252075,

DESCRIPTION

Chassis

Back

panel

<D>

Back

panel

<G>

Back

panel

<W>

Back

panel

<PX>

Back

panel

<Q>

Bracket

LH

Bracket

RH

Radiator

Bracket

SH

Bracket

H

Holder,dial

plate

Joint,power

Back

plate

Dial

plate

Spacer

3

X8xX0.8t,Nylon

washer

4

Strainrelief

Holder

38TTS+8B(BC),Tapping

screw

3TTW+8B,Tapping

screw

A4TTC+8C(BC),Tapping

screw

3TTS+10B(BC),

Tapping

screw

3TTS+10B(Ni),Nickel

screw

3P+6FN(BC),Pan

head

screw

2P+4F(BC),Pan

head

screw

3TTP+8P(BC),Tapping

screw

Front

bracket

ass'y

Top

cover

3TTS+8B(BC),Tapping

screw

3STS+8BQ(BC),

Tapping

screw

Front

panel

ass’y

3TTP+8P(BC),Tapping

screw

Clear

plate

Leg

Knob

POWER

Knob

SPEAKER

A

Knob

SPEAKER

B

Knob

VOLUME

Knob

TONE

Knob

SLIDE

Knob

PUSH

Knob

SLIDE

Knob

PUSH

\A(ST-6),Primary

fuse

»SA-SE-EAK,Primary

fuse

<G/

W/PX/Q>

REF.

NO.

PART

NO.

DESCRIPTION

F903

252075,

*

2.5A-SE-EAK,AC

outlet

fuse

<G>

F906

252070

+}

1A-SE-EAK,Secondary

fuse

<G/Q>

P304

25060044

3X

14mm,Terminal

GND

P901

253123,

+,

AS-UC-6

#

18,Power

supply

cord

253136,

<D/PX

253140

or

253146

253148

or

A

AS-CEE,Power

supply

cord

<G/

253150

Ww

253118

‘

AS-SAA,Power

supply

cord

<Q>

P902

25050341

NSCT-4P168T,AC

outlet

<D/PX>

P902,P903

25050337

&

NSCT-2P164,AC

outlet

<G/W>

2501653,

2SC3856(0),

2201654

or

—

2SC3856(Y)

or

2201655

2SC3856(P),Power

amplifier

tran-

sistor

Q523,Q524

2201663,

2SA1492(0),

2201664

or

2SA1492(Y)

or

2201665

2SA1492(P),Power

amplifier

tran-

sistor

$903,

25065123,

|,

NPS-1258P,Voltage

selector

switch

<W>

TOOL

2300303

NPT-992D,Power

transformer

<D>

2300304

4,

NPT-992G,Power

transformer

<G>

2300305

*,

NPT-992DG,Power

transformer

<w/PX>

2300339

A

NPT-992Q,Power

transformer

<Q>

Ul

1A090576-1

NAAR~-3276-1,FM/AM

tuner

and

selector

circuit

pe

board

ass'y

<D>

1A090576-1A_

NAAR~-3276-1A,

FM/AM

tuner

and

selector

circuit

pe

board

ass'y

<G/®

1A091576-1B

NAAR~-3276-1B,

FM/AM

tuner

and

selector

circuit

pe

board

ass’y

<W/PX>

U2

1A090577-1_

NAAF~-3277-1,Power

amplifier

pe

board

ass'y

U3

1A090578-1

=

NASW~-3278-1,Speaker

switch

pe

board

ass'y

1A090578-1A_

NASW-~-3278-1A,

Speaker

switch

pe

board

ass'y

<G/Q>

U4

1A090579-1_

NAETC-3279-1,Speaker

terminal

pe

board

ass’y

<D>

1A090579-1A_

NAETC-3279-1A,

Speaker

termi-

nal

pe

board

ass'y

REF.

NO.

PART

NO.

DESCRIPTION

US

1A090580-1

NAETC-3280-1,Const.

voltage

cir-

cuit

pe

board

ass'y

U6

1A090581-1_

NADIS-3281-1,Display

pe

board

ass'y

<D>

NADIS-3281-1A,

Display

pe

board

ass'y

<G/Q>

NADIS-3281-1B,

Display

pe

board

ass'y

<W/PX>

NAAF-3282-1,Volume

pc

board

ass'y

<D>

NAAF-3282-1A,

Volume

pe

board

ass'y

NAAF-3283-1,Preamplifier

pc

board

ass’y

<D>

NAAEF-3283-1A,

Preamplifier

pc

board

ass'y

<G/W/PX/Q

1A090581-1A

1A091581-1B

U7

1A090582-1

1A090582-1A,

Us

1A090583-1

1A090583-1A,

ug

1A090584-1

=

NAAF-3284-1,Switch

pce

board

ass'y

Ul0

1A090585-1

=

NADIS~3285-1,Volume

indicator

pe

board

ass’y

Ul

1A090586-1

=

NAETC-3286-1,Video

terminal

pc

board

ass'y

<D/PX>

NAETC-3286-1A,

Video

terminal

pe

board

ass'y

<G/W/Q>

NAPS-~3287-1,Power

supply

circuit

pe

board

ass'y

<D>

NAPS-3287-1A,Power

supply

cir-

cuit

pe

board

ass'y

<G>

NAPS-3287-1B,Power

supply

cir-

cuit

pe

board

ass'y

<W/PX>

NAPS-3287-1C,Power

supply

cir-

cuit

pe

board

ass'y

<Q?

Equalizer

amplifier

<D

Equalizer

amplifier

pe

board

ass'y

<G/W/PX/Q

1A090586-1A

Ul2

1A090587-1

1A090587-1A,

1A091587-1B

1A091587-1C.

Ula

1A073554-2

1A086554-3

NOTE:

“D>:

Only

120V

model

<G>:

Only

220V

model

<W>:

Only

Wolrdwide

model

<PX>:

Only

PX

model

<Q:

Only

240V

model

NOTE:

THE

COMPONENTS

IDENTIFIED

BY

MARKA\

ARE

CRITICAL

FOR

RISK

OF

FIRE

AND

ELECTRIC

SHOCK.

REPLACE

ONLY

WITH

PART

NUMBERS

SPECIFIED.

BLOCK

DIAGRAM

—120V

MODEL—

TUNER

SECTION

001

ANTENNA

TERMINAL

[ru001

Teew

FM

IF

AND

AM

RADIO

SYSTEM

L__vco

sto.

azo1

STEREO

DECODER

roe

|

aovust

‘SIGNAL

OUT:

REMOTE

CONTROLLER

701

SEGMENT

OUT

VCR

RELAY.

Power:

MUTING.

SEL

MUTE:

PROTECT

Rioz

SIGNAL,

Cever

MICROPROCESSOR

oisit

out

703

FLUORESCENT

TUBE

fae

+24

RLTOL

FL

TUBE

SW

RELAY

K+

‘c202

HI-BLEND

SWITCH

STEREO.

2206

MUTE

‘SwiTcH)

207

care

circuit

9208

Wore

SWITCH

a

ern

AMPLIFIER

SECTION

LAYER.

gs

Bin

ao

Been

ken

-

eh

awe

ry

a

sam

me

ane

'

R351

1

=

hen

-Teiae

a

VOLUME

a

=

i

ee

TEE

oncn

Beg

Vee

:

‘On

[ANALOG

SWITCH

[CONTROL/SHIFT

REGISTOR/LATCH/

LEVEL

SHIFT.

@

if

—

J

efisuer

ire

ete

oa

ee!

oe

o2st

1252-0254

Tr

“si

ciRCUIT

Oe

iis

ae

ssi

bad

os

PSO3

L901

ourcer

Relay

ao

1901

POWER:

Fo)

NEE

sate

fa201

ele

..

|

[tex

-O-#

a

Op

geaae

_

Lat

D908

[asoe

i

_

const,

assy)

ae

VOLTAGE

fe

Sires

ero!

L_++estzav

bate

ae

908

2t-13v)

sPeaKer

TERMINALS

BLOCK

DIAGRAM

—OTHER

MODELS

—

TUNER

SECTION

Poo!

ANTENNA

TERMINAL

eM

Jo101-ai03

750

aM

FMF

ame

[FM

IN

704

REMOTE

CONTROLLER

-voP:

VER

RELAY:

-

POWER’

EM

IF

AND

‘AM

RADIO

SYSTEM

R102

SIGNAL,

LEVEL

MICROPROCESSOR

SEGMENT

OUT

o1GIT

OUT

MUTING.

+———

Se.

MUTE.

PROTECT.

703

FLUORESCENT

TUBE

-—

ISI

&

AM

TUNED

LEVEL

+84

RL7OI

FL

TUBE

SW

RELAY

Tai

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Onkyo TX-850 User manual

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