Panasonic RF-2800LBS Manual

ORDER

No.

RD8003-T1030

Technical

Information

Radio

Poriable

ado

RF-2800LBS

RF-2900LBS

Subject:

Frequency

Counter

Circuit

Table

Contents

Outline

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Matsushita

Electric

Trading

Co.,

Ltd.

Panasonic

P.O.

Box

288,

Central

Osaka,

Japan

RF-2800/RF-2900

Frequency

Counter

Circuit

Outline:

The

RF-2800/RF-2900

displays

the

frequency

the

received

broadcast

counting

the

frequency

the

local

oscillator

and

scaling

accordingly.

Figure

block

diagram

for

the

receiver.

The

following

relationships

exist

between

the

reception

frequency

(fs),

the

local

oscillator

frequency

(fo),

the

intermediate

frequency

(fi)

and

the

display

frequency

(fo).

(A)

fs+fi=fo...(1)

(B)

fo=fs=fotfi...

(2)

LOCAL

OSC

CONVERSION

COMMAND

DEVICE

Fig.

With

reference

figure

for

example

Reception

frequency

(fs)=10

MHz

Intermediate

frequency

(fi)=455

kHz

Under

these

conditions,

the

local

oscillator

frequency

(fo)

must

be,

according

formula

(1),

10.455

MHz

(called

“upper

local

oscillation’’)

9.545

MHz

(called

“lower

local

oscillation’’).

Thus,

10.455

MHz

used

the

local

oscillator

signal:

Display

frequency

(fo)=

10.455

(fo)

—

0.455

(f)=

MHz

(fs)......

(3)

Therefore,

the

display

frequency

equivalent

the

reception

frequency.

The

subtraction

the

0.455

MHz

(fi)

accomplished

the

conversion

command

device

the

counter.

the

unit

were

designed

use

the

lower

local

oscillator

frequency,

signal

(preset

frequency=

0.455

MHz)

would

applied

the

counter

order

add

0.455

MHz.

the

same

time,

models

which

use

different

frequency,

such

MHz,

for

the

intermediate

frequency

(fi),

conversion

signal

applied

the

counter

order

add

(or

subtract)

MHz,

that

the

reception

frequency

will

correctly

displayed.

short,

the

conversion

signal

must

equal

+fi.

ll.

Block

Diagram

Figure

chart

the

reception

frequency,

local

oscillator

frequency

and

intermediate

frequency

for

each

band.

Intermediate

Local

Osc.

Frequency

(MHz)

Frequency

(MHz)

Frequency

(MHz)

10.7

98.2

118.7

0.150

0.410

0.605

0.865

8.0

16.0

10.0

16.0

30.0

18.0

Fig.

Because,

the

upper

local

oscillator

frequency

used

the

conversion

signal

subtracted

from

the

counter

circuit

for

each

band.

can

understood

from

the

table

figure

intermediate

frequency

10.7

MHz

used

for

the

band.

Because

the

upper

local

oscillator

frequency

used,

the

reception

frequency

displayed

after

10.7

MHz

has

been

subtracted

from

the

local

oscillator

frequency.

For

the

LW,

bands,

455

kHz

subtracted

from

the

local

oscillator

frequency.

For

the

bands,

MHz

subtracted

from

the

local

oscillator

frequency.

Figures

and

are

block

diagrams

which

include

the

RF,

Local

Oscillator,

and

Counter

circuits.

The

subtraction

accomplished

through

logic

signals

applied

pins

and

IC902.

ANT

AMP

;

AMP

LOCAL

OSC

C101

Q103

1101

COUNTER

BUFFER

e164

PRE-AMP

(3)

River

CIRCUIT

Q901,0902

1C901

0000

Circuit

COUNTER

AMP

(2)

Ree

DISPLAY

si7

Q907

1c902

Swt/Swe/Sw3

TUNING

CIRCUIT

L410,L109,

L108

CIRCUIT

£102

NOTE:

1.8902

terminal

Nos.

3.4.5,6:for

Preset

condition

terminals

3,4..5

and-6):—10.7MHz

$1:Band

Selector

FMLW/MW/SW1/SW2/SW3

ig.

Section

Block

Diagram

shown

position

C101

2nd

MIX

T102

—™

1102

AMP

Q108

SWITCHING

Q105,

Q106

000000

“oO

TUNING

CIRCUIT

COUNTER

PRE-AMP

oriver

(8)

AMP

circuit

DISPLAY

Nore

Q901,0902

Ic901

a908

1C902

Band

Selector

FM/LW/MW/SW1/SW2/SW3

(Q)@&E)

shown

position.

OSC

COILS

L118,L117,

L1t6,0115.

L114

IC902

terminals

'3)..4),.5':and

For

Preset

Fig.4

LW/MW/SW

Section

Block

Diagram

lll.

Preset

Selector

Circuit

Figure

shows

the

relationship

between

the

preset

terminals

(3,

and

IC902

and

the

preset

frequency.

Preset

terminal

Band

Preset

Frequency

(MHz)

Fig.

Figure

shows

the

preset

selector

circuitry.

COUNTER

CIRCUIT

IC902

CONNECTER

CP2-CS2

$1-9

SW1SW2SW3

DISPLAY

Preset

terminal

For

FM:

(a)

Terminal

IC902

becomes

‘'L”

level.

(through

connectors

1—-L120—Pin

7-+GRND)

(b)

Terminal

IC902

becomes

‘'L"

level.

(through

S1—9

.—Connector

2.)

(c)

Terminal

C902

becomes

“'L”’

level.

(through

S1—-9—»

D106—+Connector

(d)

Terminal

IC902

set

‘‘L”’

level.

(through

S1—9->Connector

result,

(refer

the

table

figure

the

counter

circuit

subtracts

10.7

MHz

from

the

local

oscillator

frequency

(the

input

signal),

and

the

result

displayed

the

reception

frequency.

Inthe

same

way,

for

the

LW,

and

bands

the

condition

each

preset

terminal

changed

the

band

selector

(S1—9)

consenquently,

the

preset

frequency

shown

the

table

figure

obtained,

and

the

correct

reception

frequency

displayed.

IV.

Counter

Signal

Circuitry

Figure

shows

the

counter

signal

circuitry.

For

each

band,

the

local

oscillator

signal

from

the

local

oscillator

circuitry

selected

(FM,

LW,

SW)

SW-A,

and

supplied

terminal

the

driver

circuit

(IC901).

This

signal

frequency

divided

(1/8)

IC901,

and

output

from

terminal

the

same

time,

signal

(frequency

divided

1/80)

output

from

terminal

DRIVER

CIRCUIT

C901

COUNTER

CIRCUIT

IC902

Counted

Frequency

from

Local

OSC

(9)

X'tat

OUT

FM:

98.2--118.7

MHz

LW:

605~865

kHz

MW:

987~2.072

kHz

Preset

DISPLAY

terminal

SW1:

5.2--

10.0

MHz

SW2:

10~18

MHz

SW3:

18~

MHz

These

two

output

signals

are

selected

(by

SW-B):

the

1/8

frequency

divided

output

(from

terminal

for

the

LW,

band

and

SW:~SWSs

bands,

and

the

1/80

frequency

divided

output

(from

terminal

for

the

band

are

applied

the

input

terminal

(terminal

the

counter

circuit

(IC902).

These

frequencies

are

converted,

!C902,

into

the

original

local

oscillator

frequencies.

Moreover,

depending

upon

the

signal

applied

the

preset

terminals,

the

necessary

frequency

for

each

band

subtracted

from

the

derived

local

oscillator

frequencies

and

the

resulting

frequency

supplied

the

display.

Signal

Selector

Circuitry

Figure

shows

the

signal

selector

circuitry

for

the

counter.

For

the

band,

since

the

band

selector

(S1-9)

the

‘‘FM”’

position,

the

base

each

transistor

(Q904,

Q905

and

Q906)

becomes

‘‘L”’

level,

consenquently,

Q904

and

Q905

turn

on,

and

Q906

turns

off.

result,

the

signal

from

the

band

local

oscillator

flows

shown

below,

and

counted

the

counter

circuitry.

Local

osc

C902

—

Q901

—»

Q902

-»

C908

—

IC901(3)

—

IC901(9)

C914—»

Q907

—

IC902(2)

this

case

instance,

the

local

oscillator

circuitry

for

the

LW,

and

bands

does

not

function

(refer

figures

and

the

selector).

The

signal

(AM)

from

the

1/8

frequency

divider

output

from

terminal

|C901.

However,

because

Q905

turned

thus

shorting

its

collector

emitter

junction,

the

base

emitter

junction

Q908

also

shorted,

therefore,

the

signal

current

can

not

flow

the

counter

circuit.

NOTE:

$1-8:

Band

Selector

Sw3

FM/LW/MW/SW1/SW2/SW3

CLP

Ail

FS.

shown

position.

G):

»)

cp2

CONNECTOR

R908

DRIVER

CIRCUIT

—>

Q904

1c901

R901

COUNTER

CIRCUIT

Ic902

BAND

C902

Q901

Q902

LOCAL

OSC

(Sh

CIRCUIT

c303

BAND

LOCAL

Osc].

CIRCUIT

R907

(2)

INPUT

Fig.

For

the

LW,

and

SW:~SWs

bands,

Si-9

open,

the

base

(Q904,

Q905

and

Q906)

become

‘‘H”

level,

consenquently

Q904

and

Q905

turn

off,

and

Q906

turns

on.

result,

transistor

Q907

turns

off

(base

emitter

junction

shorted

Q906)

which

results

Q901

turning

off.

Therefore,

the

signal

from

the

local

oscillator

circuit

flows

shown

below,

and

supplied

the

counter

circuitry

(IC902).

local

osc

—

C903

—

Q902

—

C908

—

1C901(3)

—

1C901(8)

—

C912

—.

Q908

—.

IC902(2)

this

case,

the

local

oscillator

circuitry

for

the

band

does

not

function.

The

above

description

the

operation

the

frequency

counter

circuitry

for

models

RF-2800/RF-2900.

The

frequency

counter

circuitry

for

other

models

similar.

Refer

RF-4900

Technical

Information

(Order

No.

RD8002-T

1028),

because

the

counter

circuitry

for

models

RF-2800/RF-2900

uses

the

same

LSI

model

RF-4900.

Printed

Japa

EM/LVW/MW/SW

6-BAND

PORTABLE

RADIO

SPECIFICATIONS

Frequency

Range:

SW:

SW2

SWs3

Intermediate

87.5~108

MHz

150~410

kHz

(2000~731m)

525~1610

kHz

(571~186m)

3.2~8

MHz

(93.8-~37.5m)

8~16

MHz

(37.5~18.7m)

16~30

MHz

(18.7~10m)

10.7

MHz

Frequency:

(LW,

SW)

455

kHz

Sensitivity

SW;

SW2

SWs

2.5uV

(S/N

dB),

2uV

down

limitter

sens.)

704V/m

(S/N

dB),

600zV/m

(S/N

dB)

302V/m

(S/N

dB),

400“V/m

(S/N

dB)

1.8uV

(S/N

dB),

192V

(S/N

dB)

0.82V

(S/N

dB),

92V

(S/N

dB)

1.24V

(S/N

dB),

134V

(S/N

dB)

Power

Output:

Maximum

National

Panasonic

Power

Source:

Power

Consumption:

Speaker:

Dimensions:

Weight:

Impedance:

ORDER

NO.

RD7803-1549

ervice

Manual

Radio

RF-2800LBS

110~125V/220—~240V

50-60

(Six

‘‘D”

Size

Flashlight

Batteries)

(National

UM-1

equivalent)

11W

(AC

Only)

(4’’)

Dynamic

Speaker

381(Wide)

246(High)

120(Deep)mm

(15°

942"'

43")

2.3

kg.

Ib.

oz.)

without

batteries

Speaker

2.0.0...

.....ccccceccccue

suas

Earphone

Jack.....................

ixe)

Multiplex

Out

Jack

.........

10k.

(40mV)

Antenna

Terminal

.........

752

Phono

Jack..................

500k

(50mV)

Recording

Out

Jack

......

80ka2

100mvV)

Specifications

are

subject

change

without

notice

for

further

improvement.

Matsushita

Electric

Trading

Co.,

Ltd.

P.O.

Box

288,

Central

Osaka,

Japan

REMOVE

CABINET

COVER

Remove

the

battery

cover.

Remove

the

six

(6)

screws

(nos.

1~6)

for

the

cabinet

cover,

shown

fig.

Remove

the

cabinet

cover.

Pull

out

sockets

from

board.

reassemble,

reverse

the

above

procedure.

REMOVE

BOARD

(IF,

Circuit)

Onno

Remove

the

cabinet

cover.

(Refer

cabinet

cover

removal

instruction.)

Remove

the

band

knob.

(To

remove

the

knob,

wind

cord

around

the

control

and

pull

outward.)

Turn

the

tuning

knob

fully

counter-clockwise.

Pull

out

the

sockets

from

board.

Unsolder

lead

from

board.

Remove

the

eight

(8)

screws

(nos.

1~8)

for

the

board,

shown

fig.

Remove

the

board.

reassemble,

reverse

the

above

procedure

and

note

the

followings.

Notes

Turn

the

tuning

knob

fully

counter-clockwise.

Turn

the

tuning

capacitor

shaft

fully

counter-clockwise.

REMOVE

FREQUENCY

COUNTER

Remove

the

board

(IF,

circuit).

(Refer

board

removal

instruction.)

Remove

the

two

(2)

screws

(nos.

for-the

frequency

counter,

shown

fig.

Remove

the

frequency

counter.

reassemble,

reverse

the

above

procedure.

REMOVE

BOARD

(Frequency

Counter)

Remove

the

frequency

counter.

(Refer

frequency

counter

removal

instruction.)

Remove

the

four

(4)

screws

(nos.

1~4)

for

the

frequency

counter

cover,

shown

fig.

Remove

the

two

(2)

screws

(nos.

for

the

board,

shown

fig.

Remove

the

board.

reassemble,

reverse

the

above

procedure.

Screw

No.1

(XTN3+6F)

Screw

No.2

XTN3-+6F)

Fig.

[2]

rr-2800LBS

Screw

No.1(CA17)

Screw

No.2(CAi7)

Screw

No.3

(CA17)

Screw

No.4

(CA)

Screw

No.5

(CAt7)

Screw

No.6

(CAi7)

Fig.

Screw

No.1

Screw

No.2

Screw

No.3

Screw

No.4

(XTN3-+6F)

(XTN3+6F)

(XTW3-++10F)

(XTW3+10F)

Screw

No.5

Screw

No.6

Screw

No.7

Screw

No.8

(XTW3-++10F)

(XTW3-+10F)

(XTW3+10F)

—

(XTW3-++-10F)

Fig.

Screw

No.

Screw

No.2

Screw

No.3

Screw

No.4

(XTW3+10F) (XTW3+10F)

(XTW3-++10F)

(XTW3+-10F)

acre

Screw

No.5

Screw

No.6

Screw

No.7

Screw

No.8

(XTW3+10F)

(XTW3-+-10F)

(XTW3+10F)

—

(XTW3-++10F)

Fig.

Screw

No.1

Screw

No.3

(XTN3+6F)

XTN3+6F)

Screw

No.4

Screw

No.2

XTN3-+-6F)

(XTN3-+6F)

Fig.

REMOVE

DIAL

SCALE

CHASSIS

Remove

the

board

(IF,

circuit).

(Refer

board

removal

instruction.)

Remove

the

tuning

knob.

Remove

the

six

(6)

screws

(nos.

3~8)

for

the

dial

scale

chassis,

shown

fig.

Remove

the

dial

scale

chassis.

REMOVE

DIAL

MECHANISM

Remove

the

dial

scale

chassis.

(Refer

dial

scale

removal

instruction.)

Remove

the

dial

belt,

shown

fig.

Remove

the

two

(2)

screws

(nos.

for

the

dial

mech-

anism,

shown

fig.

reassemble,

reverse

the

above

procedure

and

note

the

followings.

Notes

Turn

the

tuning

shaft

fully

counter-clockwise.

Set

the

dial

scale

the

position,

shown

fig.

Attach

the

dial

belt.

Refer

dial

scale

removal

instruction.

REMOVE

DIAL

SCALE

Remove

the

dial

scale

chassis.

(Refer

the

dial

scale

chassis

removal

instruction.)

Remove

the

one

(1)

screw

for

the

dial

scale

spring,

shown

fig.

Remove

the

dial

scale.

reassemble,

reverse

the

above

procedure

and

note

the

followings.

Notes:

Loosen

the

two

(2)

screws

(nos.

for

the

dial

scale

gear,

shown

fig.

Set

the

catch

dial

scale

gear

the

start

point

dial

scale,

shown

fig.

Turn

the

tuning

shaft

fully

counter-clockwise.

After

mounting

the

board

(IF,

circuit),

turn

the

dial

scale

pushing

the

catch

dial

scale

and

set

the

start

point

dial

scale

the

catch

cabinet,

shown

fig.

10.

Tighten

the

two

(2)

screws

(nos.

for

the

dial

scale

gear,

shown

fig.

10.

Screw

No.1

Catch

Cabinet

Start

Ponint

(XXAR3H6S)

Bie

Screw

No.2

(XXAR3H6S)

Fig.

Seiew

No.1

‘a

Sorew

No.2

(XTW3-++10F)

(XTW3+10F)

Fig.

0d.

Screw

(XTN23-+6C)

Dial

Belt

ae’

RSGBIBS

eas

Fig.

Screw

No.1

Screw

No.2

(XXAR3H6S)

qed

SWI

SW2'

Syvads

Catch

Start

Point

Fig.

RF-2810L-BS

[3]

REMOVE

BOARD

(AF

Circuit)

Srey

een

(

Subp

XTW3-+10F

XTW3-+10F,

Remove

the

dial

scale

chassis.

(Refer

the

dial

scale

(

)

chassis

removal

instruction.)

Remove

the

six

(6)

knobs

for

the

RADIO,

LIGHT,

BAND

WIDTH,

VOLUME,

BASS

and

TREBLE.

Remove

the

five

(5)

screws

(nos.

2, 3, 5,

for

the

board,

shown

fig.

11.

Unsoider

lead

from

board.

Pull

out

sockets

from

board.

Remove

the

board.

reassemble,

reverse

the

above

procedure.

NOOO

Screw

No.4

“Screw

No.5

Screw

No.6

Screw

No.7

(XTW3-++H10F)

(XTW3-+10F)

(XTW3-F10F)

(XTW3-+10F)

REMOVE

BOARD

(Control

Circuit)

Remove

the

dial

scale

chassis.

(Refer

the

dial

scale

Fig.

chassis

removal

instruction.)

Remove

the

three

(3)

knobs

for

the

CAL,

GAIN

and

Indicator

PITCH.

(To

remove

those

control

knobs

wind

cord

around

the

control

and

pull

outward.)

Remove

the

two

(2)

screws

(nos.

for

the

board.

Remove

the

board.

reassemble,

reverse

the

above

procedure.

REMOVE

INDICATOR

Remove

the

board

(AF

circuit).

(Refer

board

removal

instruction.)

Unsolder

the

terminal

indicator,

shown

fig.

12.

Remove

the

indicator.

reassemble,

reverse

the

above

procedure.

HOW

REPLACE

CHIP

Remove

solder

for

chip

completely.

;

Color

Original

Parts

Name

Service

Parts

Name

Remove

chip

nippers,

shown

fig.

13.

hie

Resistor

Garbon

Fegictor

Use

tube

for

service

parts

shown

fig.

and

solder

)

service

parts

according

following

table.

(please

refer

Blue

Shi

Sapa

rerarie

Capecner

Circuit

Board

Wiring

View

for

the

value

resistor

and

capacitor).

Ceramic

Capacitor

Carbon

Resistor

Fig.

[4]

pr-2800LBs

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