Kenwood TH-22A Manuel utilisateur

144MHz

TRANSCEIVER

TH-

SOAVAT/

SERVICE

MANUAL

1993-10

PRINTED

JAPAN

B51-8239-00

(B)

1408

KENWOOD

Knob

(ENCODER)

(K29-4875-14)

Antenna

(T90-0472-05)

Front

glass

(B10-1202-03)

Knob

(VOL)

(K29-4874-14)

Knob

(PTT)

Knob

key)

(K29-4876-03)

(K29-4878-03)

—C

ase

assy

(oe

dare)

laevis

TRANSCEIVER

TH-22E

(AQ2-

1763-03):

TH-22A

(A02-1

764-03):

TH-22AT

KENWOOD

Mem

(A02-1765-03):

TH-22E

Key

board

assy

(S79-041

2-05):

TH-22AT

Option

(DTP-2):

TH-22A/E

PHOTO

TH-22E

(WITH

DTP-2)

————

CONTENTS

——_—

DESTINATION

LIST...sssssssssssssssssssssssssssssesssesessersnenere

DISASSEMBLY

FOR

REPAIR

....ssssssssssssssssssssessssnsee

CIRCUIT

DESCRIPTION

....ssssssssossssssssssesssesserersserorsns

SEMICONDUCTOR

DATA.

csssscsssssssssessssccessnssesenseans

DESCRIPTION

COMPONENTS.

.v.sssesssssssssssssses

PARTS

LIST

.ccccssssssssssssossssssesspsssssssssorssssasecaseessanenens

EXPLODED

VIEW

...sssssssssscsssssssssessessessssstsenssnsnsesnses

PACKING...

10.37

TERMINAL

FUNCTION

o.csccscsccscsscesseeseeseonrere

ADJUSTMENT

.scscsctectantenssctctntrtectenvestnesnsnene

BOARD

VIEWS

VCO

UNIT

(X58-4090-00).....scsssssssssssssssssssssseesee

TX-RX

UNIT

(X57-437X-XX)

(C/4)scssseessssessssseseses

TX-RX

UNIT

(X57-437X-XX)

(D/4).sssssssssssssssssssse

TX-RX

UNIT

(X57-437X-XX)

(AVA)

sescsscssssssssssssrens

TX-RX

UNIT

(X57-437X-XX)

(B/A)

sssssscsssssssseseseeee

SCHEMATIC

DIAGRAM

....sccssssssssssssssssssssssssssssssrens

BLOCK

DIAGRAM

....sccscsssssssssssssssssssssorssssssssscseseees

LEVEL

DIAGRAM

...cscccossssssssssssessssesssesorsssesssssseeseees

DTP-2

(DTMF

KEYPAD)

.cssssssssssssssssssssssssssssssssessenes

BC-17

(WALL

CHARGER)...

sessens

BT-9

(BATTERY

CASE)...

PB-30,

(STANDARD

BATTERY.

PACK)..

PB-33

(LONG

LIFE

BATTERY

PACK)

srcsecsosun..63

PB-34

(HIGH

POWER

BATTERY

PACK).

SC-37,

38,

39,

(SOFT

CASE)...

sesnaseeseees

SPECIFICATIONS

...ccssssssssssssssssessssesee

.BACK

COVER

TH-22A/AT/E

DESTINATION

LIST

Type

Unit

Freq.range

Supplied

battery

Supplied

charger

16-key

pad

(Guaranteed

specification)

(DC)

(AC)

(DTP-2)

TH-22AT

X57

-4370-11

144

148

MHz

600mAh

120V

Installed

TH-22E

X87-4372-71

144

146

MHz

600mAh

240V

Option

TH-22A

X57-4370-71

144

148

MHz

Battery

case

(BT-9)

Option

TH-22AT

X87

-4370-11

144

148

MHz

600mAh

120V

Installed

TH-22E

X57-4372-71

144

146

MHz

600mAh

230V

Option

TH-22E

X57-4372-72

144

146

MHz

600mAh

230V

Option

-TH-22E

X57-4372-71

144

146

MHz

600mAh

230V

Option

TH-22E

X57-4372-71

144

146

MHz

9.6V

600mAh

230V

Option

TH-22E

X67-4372-71

144

146

MHz

600mAh

230V

Option

TH-22A

X57-4370-21

144

148

MHz

600mAh

120/230V

Option

TH-22A

X57-4370-22

144

148

MHz

600mAh

120/230V

Option

TH-22A

X57-4370-22

444

148

MHz

9.6V

600mAh

420/230V

Option

TH-22A

X57

-4870-22

144

148

MHz

Battery

case

(BT-9)

Option

TH-22A

X57

-4370-23

144

146

MHz

Battery

case

(BT-9)

Option

TH-22AT

X57-4370-21

144

148

MHz

600mAh

420/230V

Installed

TH-22AT

X57-4370-22

144

148

MHz

600mAh

120/230V

Installed

TH-22AT

X87

-4370-22

144

148

MHz

9.6V

600mAh

120/230V

Installed

TH-22AT

X57

-4370-22

144

148

MHz

Battery

case

(BT-9)

Installed

ent

TH-22A/AT/E

DISASSEMBLY

FOR

REPAIR

Removing

the

case

Remove

the

two

long

screws

(@)

the

rear

case.

Then

pull

out

the

two

knobs

(@)

and

remove

the

rubber

panel

(®).

Press

the

part

the

case

with

claw

(@)

and

take

apart

the

upper

and

lower

cases(@).

Note:

the

cases

are

connected

with

FFC

cable,

take

care

not

cut

the

cable

when

taking

apart

the

cases.

Removing

the

units

Remove

the

four

screws

(@)

that

are

holding

the

TX-RX

unit

(A/4).

Remove

the

BNC

receptacle

after

having

removed

the

two

screws

(@)

and

the

solder

the

terminal.

r2)

Remove

the

two

nuts

(@)

and

lift

the

unit

(@)

remove

from

the

case.

TH-22A/AT/E

DISASSEMBLY

FOR

REPAIR

Removing

the

circuit

board

Pull

outthe

holder

(@)

from

the

frame

(@)

without

bending

the

power

supply

terminal

(@).

Remove

the

solder

from

the

four

soldered

points

and

®)

the

circuit

board

and

the

frame.

Take

care

that

the

ANT

terminal

the

circuit

board

not

caught

the

frame

(@),

and

then

carefully

lift

the

circuit

board

(@)

from

the

frame.

Note:

Take

care

not

touch

the

power

module

with

your

fingers.

TH-22A/AT/E

CIRCUIT

DESCRIPTION

FREQUENCY

CONFIGURATION

The

frequency

configuration

shown

Figure

and

Tabie

(1)

144.000

147.995

MHz

(K,

M1-4,

144,000

145.995

MHz

(T,

M5)

(2)

189.05

193.045

MHz

(K,

M1-4,

ANT

189.05

191.045

MHz

(T,

Md)

45.05MHz

(1)

tstMIX

MCF

ANT'SW

;

Double

superheterodyne

{

b—

AMP

MIX,

IF,DET

F->]

AMP

Receiving

system

First

45.05

MHz

44.595MHz

Second

455

kHz

Transmitting

{

Direct

conversion

oscillating

system

amplification

systern

(2)

Mic

Modulation

Variable

reactance

phase

AMP

pLLVco

MIC

—(]

system

modulation

2 2

—

Table

Basic

configuration

12.8MHz

Fig.

Frequency

configuration

RECEIVER

SYSTEM

ANT

MCF

AMP

tit

Li2Lt3

XFA

att

Ic4

1C208

upr

fefantswEe/

AMP,DET

paid

2nd

Local

OSC

1st

Local

OSC

(PLL)

PLL

Nore)

TUNING

VOLTAGE

Fig.

Receiver

section

configuration

amplifier

The

signal

from

the

antenna

passed

through

low-pass

filter

and

the

transmission/reception

selector

circuit,

and

in-

put

the

amplifier.

The

input

signal

amplified

Q9.

The

unwanted

frequency

band

the

signal

then

elimi-

nated

band-pass

filter.

This

band-pass

filter

variable

filter

using

varicap,

and

operates

that

tunes

the

receive

frequency

with

the

tuning

voltage

that

proportion

the

PLL

lock

volt-

age.

First-stage

mixer

The

input

signal

mixed

with

the

first

local

oscillator

signal

from

the

PLL

circuit

the

first-stage

mixer

Q8,

pro-

ducing

first

signal.

The

unwanted

frequency

band

the

first

signal

eliminated

two-stage

monolithic

crystal

filters

(MCF).

Item

Rating

Nominal

center

fre-

45.05

MHz

quency

(fo)

Passband

width

+7.5

kHz

Attenuation

band

width

+22

kHz

less

Guaranteed

attenuation

£910

kHz

Spurious:

within

MHz!

Ripple

1dB

iess

insertion

loss

less

Terminating

impedance

800

0/2

Table

MCF

(L71-0409-05)

characteristics

(TX-RX

unit

XF1)

TH-22A/AT/E

CIRCUIT

DESCRIPTION

amplifier

The

first

signal

amplified

Q11

and

enters

IC4

(FM

signal

processing

IC),

where

mixed

with

the

second

local

oscillator

signal

and

converted

into

the

second

signal.

The

unwanted

frequency

band

the

second

signal

eliminated

ceramic

filter

CF1.

The

resulting

signal

then

amplified

and

detected.

Item

Rating

Center

frequency

6¢B}

Within

455

kHz+1.5

kHz

bandwidth

(fo)

6dB

bandwidth

+7.5

kHz

40dB

bandwidth

+15

kHz

less

Passband

ripple

1.5

less

(within

455+1.5

kHz)

Guaranteed

attenuation

(within

+100

kHz)

amplifier

The

frequency

characteristics

the

audio

signal

output

the

detector

are

corrected

the

Q12

active

high-

pass

filter

and

deemphasis

circuit

consisting

R67

and

C71.

The

audio

signal

then

passed

through

variable

resistor

and

amplified

power

amplifier

C208

obtain

the

desired

output.

Squelch

and

mute

circuits

The

output

detected

|C4

amplified

Q10,

wave-

form

shaped

D16

and

C80,

and

the

direct

current

input

the

microprocesser

analog

port

(pin

5).

The

voltage

input

the

microprocesser

digitized,

and

the

microprocesser

controls

the

MUTE,

AFCO,

and

AFC1,

thus

controlling

the

audio

signal.

This

port

has

hysterisis.

The

microprocesser

also

controls

the

MUTE,

AFCO,

and

AFC1

during

the

ALT,

Insertion

loss

less

CTCSS

and

DTSS

operations,

thus

controlling

the

audio

sig-

Input/output

impedance

1.5

nal.

Tabie

Ceramic

filter

(L72-0362-05)

characteristics

(TX-RX

unit

CF1)

noe

Q221

ASB

aro

-_Die

ney

Qi3

BUSY

BEEP

Mute

MUTE

AFCO

IC206

AFC1

Fig.

amplifier,

squelch,

and

mute

circuits

Condition

MUTE

AFCO

AFC1

Transmission

Reception

}

Normal

Squelch

operation

squeich

off

Bell

Standby

operation

Receive

(Bell

operation)

MUTE:

Muted

when

low

AFCO:

Muted

when

high

AFC

Muted

when

low

Table

Muting

conditions

TH-22A/AT/E

CIRCUIT

DESCRIPTION

meter

The

S-meier

signal

output

from

IC4

direct

current

corresponding

the

input

signal,

converted

voltage

R83,

then

input

the

microprocesser.

The

voltage

digitized

control

the

LCD

S-meter

dis-

play.

The

S-meter

display

level

written

into

the

EEPROM

each

unit

during

adjustment

the

factory.

Thus

there

little

variation

the

product

level.

LCD

—

TRANSMITTING

SYSTEM

Microphone

amplifier

The

audio

band

the

signal

from

the

microphone

corrected

the

6dB/oct

preemphasis

circuit

consisting

C235

and

R244.

The

18dB/oct

tone

frequency

eliminated

the

low-pass

filter

consisting

C236,

R245,

C239

and

R239

and

the

preemphasis

circuit.

The

signal

amplified

and

limited

1C207

(1/2).

Distortion

components

exceeding

the

audio

band

the

resulting

signal

are

then

eliminated

18dB/oct

frequency

correction

splatter

filter

consisting

|C207

(2/2)

and

R235

and

C230.

Modulation

circuit

The

signal

from

the

microphone

amplifier

passes

through

the

modulation

adjustment

variable

resister

VR202,

ap-

plied

VCO

varicap

diode

D3,

and

modulated

variable

reactance.

Drive

and

Final

Circuit

The

desired

signal

produced

the

VCO,

and

amplified

about

mVrms

the

buffer

amplifier.

then

amplified

Fig.

meter

eee

about

1.4

Vrms

the

drive.

The

amplified

signal

input

power

module

IC3.

The

power

module

consists

two-stage

FET

amplifier,

and

increases

the

power

about

Transmission/reception

selector

circuit

The

transmission

output

passed

through

the

transmis-

sion/reception

selector

circuit

and

low-pass

filter

the

an-

tenna.

The

transmission/reception

selector

circuit,

which

con-

sists

D11

and

D12,

turned

during

transmission

and

off

during

reception

switch

the

signal.

4201

EXT

MIC

C235

rte

AMA

AAR

R235

C236

—

WW—<

Cor

(2/2)

t22)

RES

sei"

-voo

modulation

circuit

INT.MIG

BEEP

°T

igi

;

MUTE

Fig.5

Microphone

amplifier

TH-22A/AT/E

CIRCUIT

DESCRIPTION

APC

and

transmission

output

selector

circuits

The

automatic

power

control

(APC)

circuit

used

ob-

tain

stable

transmission

current.

This

circuit

detects

the

drain

current

the

final

stage

the

power

module

and

controls

the

transmission

output.

differential

amplifier

|C204,

two

voltages

are

ap-

plied:

the

reference

voltage

produced

dividing

the

voltage

constant-current

zener

diode

D202

variable

resistors

VR201,

R210,

R211,

and

R212

for

transmission

output

ad-

justment,

and

the

detection

voltage

generated

across

R61,R62

and

R63

proportion

the

drain

voltage

the

final

stage.

The

voltage,

proportional

the

difference

between

the

reference

voltage

and

the

detection

voltage,

obtained

the

output

(pin

IC204.

This

voltage

reversed

Q203

provide

the

APC

voitage.

This

APC

voltage

controls

the

power

contro!

the

power

module

and

stabilizes

the

transmission

output.

When

transmission

output

changed,

each

switch

changed

shown

the

table

below.

The

reference

voltage

changed,

and

the

transmission

output

fixed

about

(high),

0.5

(low),

(EL).

1C3

121

Red

0.99

POWER

MODULE

LPF

R63__

0.39

ANT

DRIVE

AMP

CONT

~«-

Q202

fol

>——

Q205

Q201

Hi>—~

R209

ee,

$———<3T

Fig.

APC

and

transmission

output

selector

circuits

Temperature

protection

circuit

When

the

thermistor

detects

about

100°C,

the

tempera-

ture

protection

circuit

turns

Q15

on,

reduces

the

APC

voltage

prevent

thermal

damage

the

power

module.

H/L

and

are

control

signals

from

the

microprocessor

unit.

The

logical

relationship

shown

the

table

below.

Transmission

Reception

Daw

-—

83/

HIL

L L

Table

Transmission

output

selecting

condition

TH-22A/AT/E

CIRCUIT

DESCRIPTION

PLL

CIRCUIT

PLL

The

output

from

the

12.8

MHz

reference

oscillator

consist-

ing

divided

IC1

produce

kHz

6.25

kHz

reference

frequency.

The

comparison

frequency

obiained

amplifying

the

VCO

output

and

dividing

the

PLL

(1C1).

10,

12.5,

15,

20,

and

25kHz

PLL

synthesizer

imple-

mented

phase-comparing

the

reference

frequency

and

comparison

frequency

obtained

when

X71

divided.

The

pulse

output

from

pins

and

IC1

according

the

difference

between

the

reference

frequency

and

the

comparison

frequency

passed

through

the

charge

pump,

and

changed

current

low-pass

filter

produce

the

lock

voltage.

The

power

supply

the

charge

pump

raised

from

the

DC-DC

converter

increase

the

lock

voltage

about

7V.

VCO

(X58-4090-00)

The

desired

frequency

directly

produced

the

Colpitts

oscillator

configured

around

FET

Q2.

The

lock

voltage

applied

varicap

diodes

and

change

the

oscillator

frequency.

The

made

"L"

during

transmission.

and

are

then

turned

off

change

over

the

oscillation

frequency.

IC4

MB1511PFV-G-BND

_X58-409:VC0

Tec

+4]

CLK

“|

13]

DATA

14)

oure

C2414

FIN

osc

VCO

;

BUEFER

OUT

DRIVER

OSC

OUT

{

¥;

MIXER

‘

PLLIC

“

ULF

DETECTION

Cye-—-f

from

1C206

LOS

DC-DC

converter

©)

bids

te!

cvy

MOD

MIC

AMP

mon

LPF

Fig.

PLL

and

VCO

circuits

Unlock

detection

circuit

3C.

When

the

PLL

the

unlock

state,

the

pulse

that

ict

output

the

(pin

[C1

waveform

shaped

D3,

LoL

C9,

R11,

and

C8.

The

then

made

high.

The

voltage

y-COM

the

monitored

the

microprocessor

control

the

transmission

reception

selection

timing.

Fig.

Unlock

detection

circuit

TH-22A/AT/E

CIRCUIT

DESCRIPTION

DIGITAL

CONTROL

CIRCUIT

Keys

and

rotary

encoder

circuit

The

signal

from

keys

and

rotary

encoder

input

micro-

processer

directly

shown

Figure

Encoder

1C206

p-COM

INS

IN4.

IN3

IN2

PTT

KOUT

Fig.

Keys

and

rotary

encoder

circuit

PTT

MON!

LAMP

TCT

REV

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