Sony SRF-M100 User manual

Table of contents

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SERVICE

MANUAL

SRF-M100

AEP

Model

SPECIFICATIONS

Frequency

range

FM:

87.5

—

108

MHz

0.05

MHz*

AM:

531

—

1602

kHz

*

The

frequency

display

is

raised

or

lowered

by

steps

of

0.1

MHz.

(Example:

Frequency

88.05

MHz

is

displayed

as

88.00

MHz.)

IF

FM:

10.7

MHz

AM:

450

kHz

Speaker

4.4

cm

(1

3/4

inches),

7.2

ohms

Output

Stereo

earphones

jack

(stereo

¢

3.5mm,

load

impedance

16

ohms)

Power

output

80

mW

(at

10%

harmonic

distortion)

Power

requirements

3

V

DC,

two

R6

(size

AA)

batteries

Battery

life

(using

Sony

batteries

SUM-3

(NS))

Earphones:

FM:

Approx.

35

hours

AM:

Approx.

45

hours

Speaker:

FM:

Approx.

22

hours

AM:

Approx.

26

hours

Dimensions

Approx.

121

x

72

x

27

mm

(wih/d)

(4

7/8

x

2

7/8

1

1/8

inches)

incl.

projecting

parts

and

controls

Mass

Approx.

198

g

(7.0

02.)

incl.

batteries

Supplied

accessory

Stereo

earphones

(1)

Design

and

specifications

are

subject

to

change

without

notice.

FM

STEREO/AM

PLL

SYNTHESIZED

RECEIVER

SONY.

TABLE

OF

CONTENTS

Section

Title

Page

Specifications

eee

ee

ee

eee

eee

ray

]

1.

GENERAL

Location

of

Controls

eee

eee

ee

ee

ee

rr

ey

3

Installing

Batteries

eee

eee

i

ee

iris

3

Setting

the

Clock

eee

eee

ee

ee

ee

eee

ee

ee

ee

i

ee

ee

ee

ir

4

Operating

the

Radio

ee

er

er

er

ee

rir

4

Preset

Tuning

ORD

e

eee

meee

ed

memes

eee

ene

eee

eens

eee

eee

eenesenensneeere

4

Sound

the

Beep

at

a

Desired

Time

Cem

e

nme

re

cerns

enanseceeesseureens

5

9.

‘DISASSEMBLY

si

essnseciessdce

cents

nai

vvsen

eatavactorsenaeeys

6

3.

PIN

DESCRIPTION:

--:--cceeccesceccceeccsccscessceecescenecoeeees

7

4.

ELECTRICAL

ADJUSTMENTS

-oeeesesseseeeeeeerseeeeeeereees

9

5.

DIAGRAMS

5-1.

Printed

Wiring

Boards

<srrrrsseeessereeeeeeeeeeereeneeeneees

14

5-2.

Schematic

Diagram

deem

e

mene

n

eer

etennneee

see

eeeserenesenenes

17

6.

EXPLODED

VIEW

iisicsecsnesecnsiaiieas

shevecdeerceresnareanneans

21

7.

ELECTRICAL

PARTS

LIST

---------eeesseersrereeeeeseee

rene

ae

Flexible

Circuit

Board

Repairing

@®

Keep

the

temperature

of

the

soldering

iron

around

270°C

during

repairing.

@

Do

not

touch

the

soldering

iron

on

the

same

conduc-

tor

of

the

circuit

board

(within

3

times).

®@

Be

careful

not

to

apply

force

on

the

conductor

when

soldering

or

unsoldering.

Notes

on

chip

component

replacement

@

Never

reuse

a

disconnected

chip

component.

@

Notice

that

the

minus

side

of

a

tantalum

capacitor

may

be

damaged

by

heat.

SECTION

1

GENERAL

Front

panel

Rear

panel

Display

window

(Ob.E

Reverv

eye)

meal

ie

cam

A

|

STEREO

indicator

Lights

when

a

stereo

program

is

received.

[2]

Display

window

Speaker

[4]

ENTER/CLOCK

button

[5]

TIMER

button

BAND

selector

ALARM

button

AUTO

OFF/POWER

switch

[9]

VOLUME

control

PRESET

+

and

—

buttons

PHONES

(stereo

earphones)

jack

2

Earphones

Extend

the

earphone

cord

as

it

serves

as

the

FM

antenna.

By

disconnecting

the

earphone

cord,

the

sound

is

heard

from

the

speaker.

The

sound

coming

through

the

speaker

is

monaural.

eIae)

STEREO/MONO

(stereo/monaural)

selector

.

TUNE

(tuning)/TIME

SET

+

and

—

buttons

Battery

compartment

Telescopic

antenna

Extend

the

telescopic

antenna

as

illustrated.

Battery

indicator

Flashes

when

the

batteries

become

weak,

Alarm

indicator

Appears

when

you

set

the

alarm.

Timer

indicator

Appears

when

you

set

the

timer.

Frequency

indicator

Appears

while

the

radio

is

on.

Band

indicator

[22]

PRESET

and

preset

number

indicators

Time

indicator

Appears

when

the

radio

is

off.

This

section

is

extracted

from

instruction

manual.

Two

R6

(size

AA)

batteries

with

correct

polarity

Installing

Batteries

EJ

insert

two

R6

(size

AA)

batteries

with

correct

polarity.

When

you

insert

the

batteries

for

the

first

time,

0:00

flashes

in

the

display

window.

To

stop

flashing,

press

ENTER/CLOCK.

Knowing

when

to

replace

the

batteries

When

the

batteries

become

weak,

the

radio

is

turned

off,

the

time

indicator

appears

and

“cq”

flashes

in

the

display

window.

(The

sound

may

become

weak

or

distorted

before

“‘csa”

starts

flashing.)

Replace

both

batteries

with

new

ones.

Even

after

you

replace

the

batteries,

“cosa”

remains

flashing.

To

turn

off

“cs”,

slide

AUTO

OFF/POWER.

Replace

the

batteries

within

about

60

seconds

after

turning

off

the

power.

If

more

than

60

seconds

has

passed,

the

preset

stations

are

canceled

and

the

time

indicator

shows

0:00.

In

this

case,

perform

the

clock

setting

and

preset

tuning

again.

Notes

on

the

battery

¢

Insert

the

batteries

with

correct

polarity.

*

Do

not

mix

new

and

used

batteries.

e

The

batteries

cannot

be

charged.

*

To

avoid

damage

from

possible

battery

leakage,

remove

the

batteries

when

the

unit

will

not

be

used

for

a

long

time.

*

Concerning

the

battery

life,

see

“Specifications”.

Se

ET

Setting

the

Clock

When

you

set

the

clock,

turn

off

the

radio.

1

While

keeping

ENTER/CLOCK

pressed,

press

TUNE/TIME

SET

+

or

—

button

until

the

display

shows

the

current

time.

Press

+

to

increase

or

—

to

decrease

the

digits.

When

you

keep

the

button

pressed,

the

digits

change

rapidly.

While

setting

the

time,

“:"

is

flashing.

0:00

=

midnight

12:00

=

noon

2

When

the

display

shows

the

current

time,

release

ENTER/CLOCK.

“?"

stops

flashing

and

the

clock

starts

operating.

To

set

the

clock

to

the

second

After

adjusting

the

time,

keep

ENTER/CLOCK

pressed.

Release

ENTER/CLOCK

using

the

time

signal

as

a

reference.

eee

ule

Mm

UC

Mteleom

D

|

2

1

While

pressing

the

green

button,

slide

AUTO

’

OFF/POWER

to

the

direction

of

the

A

mark

to

turn

on

the

power.

2

Select

FM

or

AM

with

BAND.

3

Tune

in

the

desired

station

by

pressing

TUNE/TIME

SET

+

or

—

button.

At

each

press

of

+

or

—,

the

FM

frequency

changes

by

0.05

MHz

higher

or

lower

(the

display

changes

by

0.1

MHz)

and

the

AM

frequency

changes

by

9

kHz

higher

or

lower.

To

change

the

frequency

rapidly,

keep

the

button

pressed.

4

Adjust

VOLUME.

To

turn

off

the

radio

Slide

AUTO

OFF/POWER

again.

The

display

shows

the

current

time.

When

the

power

is

turned

off

automatically

The

radio

will

be

turned

off

automatically

after

about

90

minutes

to

prevent

unnecessary

wear

of

the

batteries.

To

continue

listening

to

the

radio,

slide

AUTO

OFF/POWER

again.

If

the

batteries

are

exhausted,

the

power

is

turned

off

automatically

to

protect

the

preset

contents.

To

receive

a

stereo

program

in

stereo

Use

the

earphones.

The

sound

coming

through

the

speaker

is

monaural.

Preset

Tuning

Once

you

store

the

desired

stations,

you

can

tune

them

in

by

a

simple

operation.

You

can

store

7

stations

for

each

of

the

FM

and

AM

bands.

Presetting

the

Station

[4

1

Turn

on

the

power.

2

Tune

in

the

desired

station

to

preset.

See

“Operating

the

Radio”.

.

3

Keep

ENTER/ICLOCK

pressed

for

more

than

1

second.

Release

ENTER/CLOCK

when

PRESET

and

the

preset

number

indicator

flash

in

the

display

window

with

the

beep

sound.

4

Select

a

preset

number

from

1

to

7

by

pressing

the

PRESET

+

or

—

button.

Press

+

to

increase

the

digit.

(12>...

.

+67)

to

Press

—

to

decrease

the

digit.

(7>6—>.

..

.

-*2->1)

|

eae

ee

ee

5

Press

ENTER/CLOCK

again.

Beep-beep

sounds,

and

PRESET

and

the

preset

number

stop

flashing.

The

station

has

been

stored.

To

preset

other

stations,

repeat

steps

2

to

5.

Note

Go

to

the

next

step

while

the

PRESET

and

preset

number

are

flashing

(for

about

5

seconds).

Otherwise

the

unit

returns

to

step

2.

If

this

happens,

try

again

from

step

3.

Tuning

in

a

Preset

Station

jj

1

Turn

on

the

power.

2

Select

the

band,

FM

or

AM.

3

Select

the

desired

preset

number

by

pressing

the

PRESET

+

or

—

button.

4

Adjust

VOLUME.

To

change

the

preset

station

Tune

in

the

desired

station

to

be

newly

preset.

Preset

the

tuned

station

to

the

desired

button.

The

station

previously

preset

to

that

button

is

canceled.

To

Improve

Radio

Reception

FM:

Extend

the

telescopic

antenna

and

adjust

the

angle

of

the

antenna

so

that

the

FM

sensitivity

will

be

increased.

AM:

A

ferrite

bar

antenna

is

built

in

for

AM

reception.

Rotate

the

unit

horizontally

for

optimum

reception.

If

the

FM

stereo

program

is

noisy

Usually

set

STEREO/MONO

to

STEREO.

You

can

receive

the

FM

stereo

program

in

stereo,

using

the

earphones.

When

the

signal

is

weak

and

noisy,

set

it

to

MONO.

There

will

be

no

stereo

effect,

but

the

sound

will

improve.

Sounding

the

Beep

at

a

Desired

Time

You

can

make

the

unit

sound

its

beep

through

the

speaker

or

the

earphones

at

a

desired

time.

Use

this

feature

to

remind

you

of

an

appointment,

etc.

There

are

two

ways

of

setting:

¢

Timer

setting—to

sound

the

beep

a

certain

number

of

minutes

later

than

the

present.

e

Alarm

setting—to

sound

the

beep

at

a

certain

time.

You

can

set

the

timer

and

alarm

while

the

radio

is

either

on

or

off.

Setting

the

Timer

[ej

1

While

keeping

TIMER

pressed,

press

TUNE/TIME

SET

+

or—

button

to

store

the

desired

period

in

minutes

after

which

you

want

the

beep

to

sound.

You

can

store

periods

from

1

to

180

minutes

at

one

minute

intervals.

&)

flashes

in

the

display

window

while

you

press

TIMER.

To

sound

the

beep

after

30

minutes,

for

example,

while

keeping

TIMER

pressed,

press

TUNE/TIME

SET

+

or

—

until

30

appears

in

the

display

window.

2

Release

TIMER.

©)

stops

flashing.

The

display

returns

to

the

current

time

or

to

the

frequency

which

was

shown

before

you

-

pressed

TIMER

to

start

the

timer

setting.

When

the

stored

period

has

passed,

)

flashes

and

the

beep

sounds.

:

To

cancel

the

timer

setting

Press

TIMER

again.

&)

disappears.

To

stop

the

beep

Press

any

button.

If

you

do

not

stop

the

beep,

the

beep

stops

automatically

after

about

3

minutes.

When

the

beep

sounds

while

you

are

fistening

to

the

radio,

the

radio

reception

stops

and

resumes

when

the

beep

stops.

Setting

the

Alarm

[J]

Make

sure

that

the

clock

is

correctly

set.

(See

“Setting

the

Clock”.)

1

White

keeping

ALARM

pressed,

press

TUNE/TIME

SET

+

or

—

button

to

set

the

time

you

want

the

beep

to

sound.

)

flashes

while

you

press

ALARM.

To

set

the

alarm

for

7:00

in

the

morning,

for

example,

while

keeping

ALARM

pressed,

press

TUNE/TIME

+

or

—

until

7:00

appears

in

the

display

window.

2

Release

ALARM.

*)

stops

flashing.

The

display

returns

to

the

current

time

or

the

frequency

which

was

shown

before

you

pressed

ALARM

to

start

the

alarm

setting.

When

the

time

comes,

()

flashes

and

the

beep

sounds.

To

cancel

the

alarm

setting

Press

ALARM

again.

()

disappears.

To

stop

the

beep

Press

any

button.

If

you

do

not

stop

the

beep,

the

beep

stops

automatically

after

about

3

minutes.

When

the

beep

sounds

while

you

are

listening

to

the

radio,

the

radio

reception

stops

and

resumes

when

the

beep

stops.

Notes

e

When

0:00

flashes,

you

cannot

set

the

alarm.

e

When

you

stop

the

beep,

the

timer

setting

is

canceled.

The

alarm

setting

remains.

*

Even

if

you

are

listening

to

radio,

you

can

set

the

timer

and

alarm.

SECTION

2

DISASSEMBLY

Note

:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

2-1.

CABINET

(REAR)

2-3.

MAIN

BOARD

4+B2

x

8

@

+82x6

ees

x

Battery

case

¢

7

@+B2x8

™%

:

é

}

f

PEA

©

Cabinet

(Rear)

‘

as

©

Press

the tab

as

YY

shown

by

the

arrow.

i

N

aS

©

Insert

a

flat-tipped

screwdriver

in

the

groove

between

the

front

cabinet

and

,

4)

Pies

ie

tab

es

SHOW

Dy

Meow,

the

rear

cabinet

to

open.

2-2.

CABINET

(FRONT)

2-4.

MICROCOMPUTER

BOARD

@

+826

-

@

+82

x6

Microcomputer

board

@

Press

the tab

as

shown

by

the

arrow.

SECTION

3

PIN

DESCRIPTION

Pin

description

of

4

PD1724GB-555-1A7

(IC101)

LCD

drive

segment

signal

output.

Pin

number

-[2

pe

>)

ea

—

Mm

__

ON

APN

owo

re

i

bdo

LCD

drive

common

signal

output

—

be

—_

al

VSS3

CAP2

CAP1

CGP

BUZZER

16

Terminals

used

for

connecting

a

capacitor

of

a

doubler

circuit

which

supplies

LCD

17

drive

voltage.

18

VSS2

Audio

mute

output

signal.

Active

when

Low.

Audio

noises

are

reduced

before

and

after

the

mute

signal

when

PLL,

radio

power

supply

or

key

srtobe

change

is

controlled.

Buzzer

output

using

CGP.

Sound

to

check

keys,

to

check

settings,

to

indicate

that

a

setting

time

of

timer

is

reached

or

to

alarm

is

produced

by

using

two

kinds

of

musical

intervals

and

the

sound

modulation.

nN Oo

pels!

ie)

D

D

VCOH

VHF

VCOM

FM

VCO

25

VCOL

AM

VCO

26

VSS1

VSS1

27

EOI

EO1

Ea

Not

use

with

this

machine.

28

EO2

EQ2

5V

power

supply

input

terminal.

NY

0

<

i)

23

24

Detects

the

voltage

reduction

of

the

AC

battery.

When

the

battery

energy

is

reduced,

the

microcomputer

is

in

the

reducedvoltage

mode.

The

battery

mark

blinks

and

the

microcomputer

waits

for

a

clock’s

reset/display

and

Power

ON

Key.

A

quartz

oscillating

element

connecting

terminal.

(75kHz)

Connected

to a

capacitor

for

a

regulator

circuit

which

supplies

the

oscillator’

stable

drive

voltage.

Time

display

switching

input.

It

is

a

24-hour

system

display

when

Low

and

a

12-hour

system

display

(AM/PM)

when

High.

When

the

setting

is

changed,

backup

power

supply

must

be

set

to

OFF

and

internal

RAM

must

be

initialized.

ON/OFF

switching

output

for

the

radio

power

supply.

(ON

:

High

,

OFF

:

LOW)

Strobe

output

for

initial

switch

input.

INIT

OUT

(Active

:

High)

o——+

INITIN

1:

12-/24-hour

system

display

LOW

(OFF)

:

24-hour

system

display,

Hgih

(ON)

:

12-hour

system

dispaly

o——»>

INIT

IN

2:

Band

selection

Not

use

with

this

machine.

pe

o

ies)

le

eg

30

31

XI

XO

32

VSS4

VSS4

x

He

‘

OO Ww

Ww

PA3

INIT

IN1

Qo

KR

PA2

POWER

OUT

nS

PAI

INIT

OUT

number

1-bit

input

which

sets

two

kinds

of

receiving

band

versions.

When

the

setting

is

36

PAO

INIT

IN2

I

changed,

backup

power

supply

must

be

set

to

OFF

and

internal

RAM

must

be

initialized.

Cas

[i

BEEP

Vol

BEEP

volume.

Output

for

increasing

the

volume

of

the

BEEP

sound

when

a

setting

time

of

timer

is

reached

or

an

alarm

is

ON.

The

volume

is

increased

when

high.

ten

aca

(50

ct

ane

ER

Pap

Pe

Key

SOURCE

a

K3

7

|

Key

RETURN

I

48

KO

1-bit

output

which

sets

two

kinds

of

receiving

bands.

Two

settings

are

as

followes.

AM=H,

FM=L,

POWER

OFF

:

L

Strobe

and

return

signals

in

3

X

4 key

matrix.

A

strobe

signal

change

makes

an

audio

noise.

A

strobe

signal

must

be

set

to

the

fixed

value

when

a

key

input

is

not

changed.

When

the

key

input

is

decoded,

the

mute

signal

must

be

added.

SECTION

4

ELECTRICAL

ADJUSTMENTS

©

Be

sure

to

perform

a

AM

tracking

adjustment

after

having

made

a

AM

frequency

coverage

adjustment.

Setting:

BAND

SW

:

AM

STEREO

/MONO

SW

:

MONO

AM

PF

signal

generator

Put

the

jead-wire

VA

antenna

close

to

the

set.

Cd

Phones

jack

30%

amplitude

modulation

by

400Hz

Signal.

Output

level

:

as

low

as

possible.

AM

IF

Adjustment

Procedure

:

1.

Set

the

frequency

of

the

set

and

RF

SSG

at

531

KHz.

2.

Adjust

T1

so

that

the

reading

of

VTVM

becomes

maximum.

3.

Refer

to

the

diagram

below

for

the

final

characteristics.

ae

(final

characteristics)

T1

{MAIN

BOARD

(Conductor

side)]

{MAIN

BOARD

(Component

side))

digital

voltmeter

AM

Frequency

Coverage

Adjustment

AM

Tracking

Adjustment

Procedure

:

Procedure

:

1.

Set

the

frequency

of

the

set

and

RF

SSG

at

531kHz.

1,

Set

the

frequency

of

the

set

and

RF

SSG

at

585kHz.

2.

Adjust

LS

so

that

the

voltage

between

TP4

and

the

2.

Adjust

L1

so

that

the

reading

of

VTVM

becomes

ground

becomes

|

+

0.05V.

maximum.

3.

Set

the

frequency

of

the

set

and

RF

SSG

at

1,602kHz.

3.

Set

the

frequency

of

the

set

and

RF

SSG

at

1,485kHz.

4,

Adjust

CT3

so

that

the

voltage

between

TP4

and

the

4.

Adjust

CT1

so

that

the

reading

of

VTVM

becomes

ground

becomes

7.3

+

0.05V.

maximum.

5.

Repeat

the

adjusting

steps

above

two

or

three

times.

@

Terminate

the

AM

tracking

adjustment

by

adjusting

the

trimmer

capacitor.

@

Be

sure

to

perform

a

FM

tracking

adjustment

after

having

FM

Frequency

coverage

and

Taking

Adjustment

Setting:

BAND

SW

:

FM

STEREO

/MONO

SW

:

MONO

VTVM

FM

PF

signal

generator

Phones

jack

(CJ

22.5kHz,

frequency

deviation

by

400

Hz

signal.

Output

level

:

as

low

possible

digital

voltmeter

(MAIN

BOARD

(Component

side)]

FM

Frequency

Coverage

Adjustment

Procedure

:

1.

Set

the

frequency

of

the

set

and

RF

SSG

at

108.0MHz.

2.

Adjust

L4

so

that

the

voltage

between

TP4

and

the

ground

becomes

9.5

+

1.5V.

made

a

FM

frequency

coverage

adjustment.

(MAIN

BOARD

(Conductor

side)]

FM

Tracking

Adjustment

Procedure

:

1.

Set

the

frequency

of

the

set

and

RF

SSG

at

87.5MHz.

2.

Adjust

L2

so

that

the

reading

of

VTVM

becomes

maximum.

3.

Set

the

frequency

of

the

set

and

RF

SSG

at

108.0MHz.

4,

Adjust

CT2

so

that

the

reading

of

VTVM

becomes

maximum.

5.

Repeat

the

adjusting

steps

above

two

or

three

times.

@

Terminate

the

FM

tracking

adjustment

by

adjusting

the

trimmer

capacitor.