Kenwood KRC-444D Manual de usuario

KRC-444D/L

KENWOOD

SERVICE

MANUAL

PRINTED

JAPAN

BS1-3008-00

(O)

1068

Knob

(Button)

Panel

ass‘y

Knob

(Button)

Handle

ass’y

(K27-1645-04)

{A20-)

(K27-1651-04)

(KO01-0078-03)

Knob

(Button)

Knob

(Button)

Knob

(Button)

(K27-1364-04)

(K27-1652-04)

(K29-2582-04)

Knob

(Button)

Knob

(Button)

Knob

(Button)

Knob

(Button)

(K29-0440

-03)

(K29-2415-04)

(K29-2445-04)

{K29-2416-04))

(K29-2442-04)

Knob

(Button)

Knob

(Button)

Knob

(Button)

Knob

(Button)

(K29-2583-04) (K29-2443-04)

(K29-2444-04)

(IK29-2583-04)

Metallic

cabinet

ass’y

{A01-1430-13)

Cord

with

connector

(E30

-1497-05)

Refer

parts

list

page

27,

Photo

KRC-444D.

KRC-444D/L

DISASSEMBLY

FOR

REPAIR

Remove

three

screws

retaining

the

top

cover

(@).

Remove

the

top

cover

the

directions

arrows

C2)

Remove

five

screws

retaining

the

bottom

cover

(@).

Remove

the

bottom

cover

the

directions

arrows

(@).

BWN-

Remove

volume

knob

(@).

Remove

eject

and

FF.

REW.

knob

(@).

Remove

four

screws

retaining

the

handle

with

hexagon

wrench

‘@

Remove

the

front

panel

the

directions

arrows

(©).

Remove

two

screws

retaining

the

mechanism

ass’y

C9)

10.

Extract

the

connectors

(CN1,

5) of

the

synthesizer

unit

(X14-1952-70)

(QD).

11.

Remove

the

mechanism

ass‘y

the

directions

arrows

().

KRC-444D/L

DISASSEMBLY

FOR

REPAIR

12.

Extract

the

connectors

(CN2,

the

S.D.K.

unit

(X13-5432-70),

remove

the

synthesizer

unit

(X14

-1952-70)

the

directions

arrows

(®

13.

Remove

the

grounding

terminal

the

synthesizer

unit

(X14-1952-70)

(

®).

14.

Extract

the

connectors

(CN1,

the

synthesizer

unit

(X14-1952-70)

(Q)).

15.

Extract

the

flexible

board

from

the

connector

(CN7)

the

synthesizer

unit

(X14-1952-70)

the

directions

arrows

(®

16.

Remove

two

screws

the

shassis

(

@%).

17.

Resolder

the

synthesizer

unit

(X14-1952-70)

foil

side

and

shassis

(

18.

Resolder

the

tuner

unit

(X05-3182-70)

and_

shassis

(®).

19.

Remove

four

screws

retaining

the

front

shassis

(@).

20.

Remove

volume

nut

21.

Remove

four

screws

retaining

the

synthesizer

unit

(X14-1952-70)

(

@)).

22.

Extract

the

synthesizer

unit

(X14-1952-70)

the

shassis

the

directions

arrows

(@®

REMOVING

THE

POWER

(X14-1952-70)

(1C4)

Remove

twe

screws

retaining

the

shassis

(@).

Remove

|C4

from

the

synthesizer

unit

(X14-1952-70)

foil

side

(@).

Extract

IC4

(X14-1952-70)

the

directions

arrows

(©).

BLOCK

LEVEL

DIAGRAM

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KRC-444D/L

CIRCUIT

DESCRIPTION

Description

Components

TUNER

UNIT

(X05-3182-70)

Component

Use/Function

Operation/condition/compatibility

Detection

Noise

Canceller

MPX

LOCAL/DX

Gain

ANRC

Buff.

CRSC

Driver

S.D.K.

UNIT

(X13-5432-70)

Component

Use/

Function

Operation/condition/compatibility

1C1

TAPE

AMP

IC2

DECORDER

IC3

DECORDER

METAL

Select

OFF

when

METAL

mode.

AMP

signal

(125Hz)

AMP.

AMP

GAIN

Select

when

mode

(Amp

gain

turns

high.)

17mV—50mV

(TP1)

Buffer

Inverter

when

mode.

125Hz

VCO

STOP

when

SDK

mode.

(VCO

stops

when

SDK

OFF.)

Signal

(TAPE/RADIO)

Select

when

TAPE

mode.

(OFF

when

signal

interrupting.)

Signal

(TAPE/RADIO)

Select

when

mode.

SYNTHESIZER

UNIT

(X14-2952-70)

Operation/condition/compatibility

IC1

Controller

1C2,1C3

POWER

AMP

ICS

PRE-OUT

AMP

Q1,Q2

AVR

Power

supply

Select

SDK

Power

supply

Select

when

FM/SDK

mode.

when

SDK

mode.

Q6,Q7

(MW/LW)

Power

supply

Select

when

(MW/LW)

mode.

Q8,Q9

Power

supply

Select

when

mode.

Q11,Q12

Mute

Drive

when

pu-processor

Mute,

Mech

Mute

mode.

Q13,014

TAPE

Power

supply

select

when

tape

AVR

ACC

OFF

Mute

Drive

Microprocessor

Buffer

AMP

LOUD

Q25

Muting

Q26

Muting

VOL

STOP

MONO

Q31

(Station

Detector)

BAND

Select

BAND

Select

Mute

IND

Prohibit

Release

Q15

Q16

017,Q18

Q21

,Q22

OFF

when

Acc

signal

down.

when

Power

(CE

terminal

turns

Low

High.)

when

LOUD

ON.

ch)

when

LOUD

ON.

ch)

when

Muting.

ch)

when

Muting.

ch)

OFF

when

VOL

mode.

when

IND

lit

on.

when

MONO

ON.

when

SEEK

STOP

mode.

when

Micro-processor

BAND

terminal

‘““H’’.

when

Micro-processor

BAND

terminal

‘’H’’.

OFF

when

Micro-processor

Mute

signal

output.

when

SDK

mode.

Q39

BAND

Key

Prohibit

when

TAPE

mode.

041

,Q42

LPF

(FM/MW)

043,044

LPF

(LW)

when

FM/MW

mode.

{OFF

when

mode.)

OFF

when

FM/MW

mode.

(ON

when

mode.)

when

FM/MW

mode.

(OFF

when

mode.)

when

(MW/LW)

mode.

LPF

MONDO

Display

Prohibit

O46

Q47

048,049

KRC-444D/L

CIRCUIT

DESCRIPTION

AND-GATE

For

CPU

Key

Matrix

Operation

Description

-—-

GND

(OV)

----

Vpp

(SV)

Vpp

(5V)

GND

(OV)

Synthesizer

Unit

.-Com:

u.PD

1708G

FUNCTION

OUTLINE

Receiving

frequency,

Channel

spacing,

Reference

frequency,

Intermediate

frequency

band

Frequency

range

Channel

spacing

87.50~

108.0

MHz

50kHz

CPU

Key

Matrix

Operation

The

source

clock

from

the

CPU

input

A-input

via

the

AND-GATE

any

time

apply

the

control

signal

B-

input.

When

the

signal

input

B-input,

the

output

goes

high

and

input

the

CPU

key

input.

When

the

B-input

low

level,

output

always

low.

Output

synchro-

nized

with

input

Reference

frequency

Intermediate

frequency

12.5

kHz

10,700

“MANUAL

kHz

band

Frequency

range

Channel

spacing

Reference

frequency

Intermediate

frequency

522~-1611

kHz

450

kHz

153

~281

kHz

9kHz

MANUAL

kHz

Tuning

Function

(1)

(2)

Auto

Tuning

(Sawtooth

wave

mode)

Seek

Up:

Once

station

tuned,

held

tuned.

Manual

Tuning

(Sawtooth

wave

mode)

Manual

Up/Down:

Frequency

advanced

down

steps

pressing

the

push

switch.

Pressing

for

half

second

advances

down

continuously

until

the

switch

released.

Preset

Memory

Recall

stations

each

FM,

MW.

and

band

can

preset

independently

with

the

buttons.

The

last

sta-

tion

stored

memory

for

each

band

when

power

turned

off.

kHz

450

kHz

Tape

Function

Tape

running

indicator

METAL

control

Radio

Function

MONO

contro!

Other

Functions

LOUDNESS

control

KRC-444D/L

CIRCUIT

DESCRIPTION

TERMINAL

DESCRIPTION

Terminal

Configuration

(Top

View)

aot

[Jj

4c]

CCt~—“‘CLSS

420

[ee

DG:

43L

Px)

440

sy)

450

uPD1708G-637-00

(TOP

VIEW)

[20

Pot—“;i‘*

480

p16

P14

12 13

KS,

(PB,)

BANDZ/N.R

METAL-LOC

LOUDNESS

[Pin

No.

este

rie

KS,/K,

(PA,)

KS,/K,

(PA,)

p24

KS,

(PB,)

KS,

(PB,)

Not

used.

description

KRC-444D/L

CIRCUIT

DESCRIPTION

Name

Description

LCD

segment

signal

LCD

segment

signal

output

(1/2

duty,

1/2

bias

LCD

should

used.

Frame

frequency:

100

Hz,

Drive

voltage:

VDD)

LCD

common

signal

LCD

common

signal

output

Power

input

Device

power

supply

pins

During

device

operation,

10%

voltage

supplied

via

these

pins.

Either

them

can

used

for

supplying

the

power

individually.

The

rising

time

VDD

should

less

than

500

4.5

V).

When

the

rising

time

too

long,

when

the

VDD

not

lowered

completely

and

then

raised

4.5

from

the

voltage

lower

than

the

operating

rate,

the

diode

switch

condition

for

initialization

not

read

out

correctly.

such

cases,

use

the

that

the

diode

switch

status

can

read

out

for

initialization.

VCO

input

This

inputs

the

station

output

signal.

Since

incorporates

the

amp,

cut

the

signal

with

the

capacitor.

VCO

input

This

inputs

the

station

output

signal.

Since

incorporates

the

amp,

cut

the

signal

with

the

capacitor.

Ground

Connect

the

ground

terminal

the

set.

Error

Out

Charge

pump

output

the

phase

detector

consisting

PLL.

When

the

frequency

divided

the

oscillating

frequency

higher

than

the

reference

frequency,

these

pins

output

high

level

signals,

and

when

lower

than

the

reference

frequency,

they

low.

When

the

frequency

(divided

the

oscillating

frequency)

coincided

with

the

reference

frequency,

enters

into

the

floating

status.

MUTE

Chip

Enable

Crystal

resonator

This

used

input

the

selected

signal

from

the

device.

When

operating

the-PLL

section,

this

goes

high,

and

when

the

PLL

section

stopped,

goes

low.

When

low

level,

the

display

goes

off.

However,

low

level

signal

below

134

high

level

signal

not

accepted.

Connectors

the

crystal

resonator.

Connect

the

4.5

MHz

crystal

resonator.

Mute

Out

This

outputs

the

muting

signal

eliminate

shock

noise

when

the

PLL

unlocked

and

pop

noise

when

switching

between

Tape

and

Radio,

and

active

low.

(CMOS

output)

For

timing

details,

refer

the

Mute

Out

Timing

Chart.

When

the

pinis

low,

this

active

low.

Band

Out

FM/MW

switching

output

FM:

High

MW:

Low

When

the

MODE

switch

set

‘1"’

(Tape

mode),

this

low.

When

the

SDK

provided,

the

SDK

section.

Key

return

signal

source

and

Key

return

signal

input

This

becomes

the

source

key

return

signal

read

out

the

diode

matrix

for

initialization

only

when

the

power

turned

for

the

first

time

(rising

time

VDD)

when

the

set

returned

from

the

back-up

condition

(CE:

Low

High).

Then,

this

inputs

the

key

return

signal

for

the

key

matrix.

Insert

the

pull-down

resistor.

(CMOS

input

/output)

Key

return

signal

source

and

Key

return

signal

input

This

becomes

the

source

the

key

return

signal

read

out

the

diode

matrix

for

initialization

only

when

the

power

turned

for

the

first

time

(VDD

rising

time)

when

returning

from

the

back-up

condition

(CE

goes

high

from

low).

Then,

this

inputs

the

key

return

signal

for

the

key

matrix.

Insert

the

pull-down

resistor.

(CMOS

input

/output)

Key

return

signal

input

This

inputs

the

key

return

signal

for

the

key

matrix.

Insert

the

pull-down

resistor.

(CMOS

input)

Key

return

signal

source

This

outputs

the

key

return

signal

for

the

key

matrix.

Since

the

synchronous

current

greatly

lowered

because

its

configuration,

the

reverse-current

prevention

diode

will

not

necessary

for

the

key

source

side.

(CMOS

output)

METAL/DX/LOC

LOC

Out

{In

radio

mode:

DX/Local

On/Off

output

When

“LOC”

displayed

the

LCD

panel,

high

level

signal

output.

When

not

lit,

low

level

signal

output.

(When

the

power

turned

on,

low

level

status

initialized.)

tape

mode:

METAL

On/Off

output

When

“METAL”

displayed

the

LCD

panel,

low

levet

signal

output.

When

not

lit,

high

level

signal

output.

initialization

when

the

tape

power

turned

on,

high

level

output.

KRC-444D/

CIRCUIT

DESCRIPTION

Symbol

Name

Description

LOUDNESS

output

When

“LOUD”

displayed

the

LCD

panel,

low

level

signal

output.

When

not

lit,

high

level

signal

output.

When

the

power

turned

first

(VDD

rising

time),

low

level

signal

output.

LOUDNESS

Loudness

Out

(CMOS

output)

DOLBY

output

When

“DOLBY”

displayed

the

LCD

panel,

high

level

signal

output.

When

not

lit,

low

level

signal

output.

initialization

when

the

power

turned

on,

low

level

output.

BAND2/NR

When

Band

“0”

“1”

and

the

selector

“1”,

this

functions

the

on/off

output

pin.

When

“NR”

dis-

played

on the

LCD

panel,

high

level

signal

output.

When

not

lit,

low

level

signal

output.

This

can

operated

the

TAPE/RADIO

mode.

initialization

when

the

power

turned

on,

this

low

level.

When BAND

“0”,

“1”

and

the

selector

“0”,

this

function

the

WIDE-ADV

on/off

output

pin.

Inthe

Radio

mode:

This

functions

the

WIDE

on/off

output

pin.

When

“WIDE”

displayed

the

LCD

panel,

high

level

signal

output,

and

when

not

lit,

low

level

output.

Inthe

Tape

mode:

This

functions

the

ADV

on/off

output

pin.

When

“ADV"

displayed

the

LCD

panel,

high

level

signal

output,

while

not

lit,

low

level

output.

initialization

when

the

power

turned

first,

low

level.

When BAND

“0”

and

the

selector

0”

(SDK

oper-

ation

normal

only

when

this

status),

and

BAND

“1""

this

functions

the

BAND

output.

BAND

be-

comes

the

band

switching

output

port

combination

with

BAND

Output

KRC-444D/L

CIRCUIT

DESCRIPTION

KEY

MATRIX

CONFIGURATION

1-1.

Key

Matrix

Layout

KSg

(28)

KSg

(25)

KS,

(20)

REeaN

Ree

The

the

SSS

shows

the

no.

LL]

Momentary

switch

Diode

matrix

(closed/opened

diode)

Alternate

switch

transistor

switch

Open

LLL

1-2.

Switch

Connection

1-3.

Key

Matrix

Connection

Momentary

switch

Alternate

switch

uPD1708G-637-00

KSo

KSm

Diode

matrix

open

Transistor

switch

Vop

KSm—

Momentary

switch

Alternate

switch

transistor

switch

Diode

matrix

tk}

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