Kenwood-KAC859 caramp.pdf

POWER AMPLIFIER

KAC-859

SERVICE MANUAL

B51-7626-00 (K) 3547

HEAT SINK

(F01-1629-01)

DRESSING PANEL

(A21-4015-02)

DC CORD ASSY

(E30-4341-05)

(J type only)

LEAD TERMINAL SET

(E type only)

POWER IN

GND

SPEAKER

BRIDGED

LEFT

SPEAKER LEVEL INPUT

LEFT

RIGHT

SUB

FUSE (25Ax2)

O UTPUT

RIGHT

P.CON

BATT

SPEAKER LEVEL INPUT

TERMINAL COVER SET

SUB

(W01-1515-05)

FUSE

(E52-0014-05)

SCREW TERMINAL

BOARD

(E70-0828-05)

SCREW TERMINAL

BOARD

(E70-0829-05)

SCREW TERMINAL

BOARD

(E70-0821-05)

(N99-1587-05)

GND

100

150

0.5

(MIN)5

0.5

170

5/4/3 CHANNEL

POWER AMPLIFIER

(MIN)5

0.3

0.2 (MAX)

OFF

150Hz

80Hz

OFF

150Hz

80Hz

(MIN)5

0.3

0.2 (MAX)

0.3

0.2 (MAX)

STEREO

OPERATION

B SUB

MONO(Lch)

200

SENSITIVITY(V)

A.CH INPUT

A.ch HPF

B.ch HPF

SENSITIVITY(V)

B.CH INPUT

SENSITIVITY(V)

SUB.CH INPUT

FREQUENCY(Hz)

SUB.CH LPF

SUB

SELECTOR

INPUT

INPUT SELECTOR

LINE IN

PIN JACK

(E63-0849-05)

40%

(W01-1530-05)

SCREW SET

5 CH AMP. BLOCK DIAGRAM

SP-P-CON

FILTER

80,150,OFF

S1-1

(12dB/oct)

P-CON

IC1

320mV

T1,T2

Q1-6

HPF

IC4 (1/4)

+LB

-LB

+HB

-HB

200mV

Q101,102

40W

DC/DC

MUTE

BATT

)

IC5

CONVERTER

(1/4)

IC4 (2/4)

HPF

-1

11.8V

S1-2

80,150,OFF

S2-1

[ LEVEL DIAGRAM ]

IC2

HPF

MONO AMP

IC4 (3/4)

MUTE

Q201,202

40W

IC5

(2/4)

(4 )

IC4 (4/4)

HPF

4ch AMP

-1

IC5

S2-2

(3/4)

ISOLATION

& FILTER

-10

POWER

IC3

IC5

-1

IC3

(4/4)

(1/4)

(2/4)

IC3 (3/4)

LPF

IC3 (4/4)

INFRA

120mV

21.9V

SUB

SUB/AB

15Hz

120W

(4 )

SUB

(18dB/oct)

Q307

MUTE

50Hz-200Hz

(18dB/oct)

KAC-859

KAC-859

CIRCUIT DESCRIPTION

SP P-CON Switching Circuit

When the SP output from the head unit is con-

nected to SP IN, the power can be switched

ON/OFF based on the DC voltage of the SP out-

put.

However, As certain head unit models output DC

permanently or generate a click during switching

OFF, it is required to provide the capability of pre-

vious P-CON switching.

A circuit which can perform the switching without

using a switch is described below.

This circuit performs switching by inhibiting the

operation of the S-P-CON circuit when a voltage

is applied to the P-CON pin.

Circuit operation description When the head unit

is connected to SP-INN, the DC component in the

SP output turns Q2 ON through D8 and R16.

When a voltage is applied to the P-CON pin under

this condition, Q13 is turned ON via R44, positive

feedback is applied by combination of Q13 and

Q14, Q13 and Q14 are held at ON, so the voltage

at point (A) is almost 0V and the SP-P-CON cir-

cuit is not activated.

This circuit holds the ON status while the DC volt-

age from SP is present.

Therefore, in this condition, the P-CON circuit

continues functioning.

To cancel the functioning, the voltage at the SP-IN

pin should go 0V.

D11

7.5v

power control

to P-CON terminal

R16

from SP-P-CON

4.7k

Q14

Q13

KAC-859

ADJUSTMENT

ITEM

INPUT SETTINGS

OUTPUT SETTINGS

TUNER (RECEIVER)

SETTINGS

ALIGNMENT

POINTS

ALIGN FOR

FIG.

Connect a cassette receiver or other receiver.

IDLE CURRENT

Connect a DC voltmeter to

CN7/CN8 and J4(SP.OUT,

L+/R-) in X09-5330-10 UNIT

Volume : 0

(A)

VR101(Lch)

VR102(Rch)

(B)

VR201(Lch)

VR202(Rch)

After sufficient aging

adjust to 2.0mV

(a)

IDLE CURRENT

Connect a DC voltmeter to

CN7 in X08-4080-10 UNIT

Volume : 0

(SUB)

VR401

After sufficient aging

adjust to 2.0mV

(a)

(a)2mV

SPEAKER

OUTPUT

SPEAKER

LEVEL

INPUT

B ch

FUSE

P.CON.

BATT.

GND

A ch

DC VOLTMETERS

2mV

(a)2mV

A-Lch

A-Rch

CN7

B-Rch

B-Lch

CN8

VR102

(A-Rch)

VR202

(B-Rch)

VR201

(B-Lch)

VR101

(A-Lch)

(X09-5330-10)

CN7

VR401

(IDLE ADJ.)

(X08-4080-10)

(a)2mV

PC BOARD (Component side view)

PREAMPLIFIER UNIT

X08-4080-10 A/2 (J74-1031-11)

Ref.No. Address Ref.No. Address

IC1

Q108

IC2

Q109

IC3

Q110

R243

R244

IC4

Q201

R242

R241

D209

D210

IC5

Q202

W14

R141

R143

C124

Q102

D109

IC6

Q203

C123

VR1

C236

C235

Q204

R142

R255

R256

R257

R258

R352

Q205

C135

R139

R140

R339

C136

R155

C118

R156

A.CH

INPUT

R158

R157

Q206

R128

W154

SENSITIVITY

Q207

R253

R254

W46

Q108

C229

C230

Q208

R125

R154

R153

C233

R251

R261

R249

C234

R252

R262

R250

Q209

C129

C130

IC4

IC5

R245

R246

Q210

C134

R151

R152

R162

R150

C133

A.CH

HPF

R161

C227

C228

W143

W131

W47

Q301

R146

R145

R349

R149

R247

R248

R228

Q302

C128

C127

W117

C226

R148

R147

R238

Q10

Q303

C237

C218

R260

C126

C125

Q11

Q304

C11

R259

C138

C137

C225

W94

Q12

Q307

B.CH

HPF

C224

C223

R336

Q13

Q401

D305

C322

R334

Q14

Q402

VR2

Q101

Q403

C324

C115

R105

R332

R333

Q102

Q404

W76

B.CH

INPUT

SENSITIVITY

Q103

Q405

IC1

W77

Q104

Q406

R329

R106

Q105

Q407

C321

W60

Q106

Q408

R331

C323

C116

R327

R335

Q107

Q409

INPUT

SELECTOR

R330

C320

R328

R326

A B

W57

W56

C325

C326

R47

C335

C330

C327

C328

C329

R101

R205

R341

R343

R345

R347

C104

R342

R102

W73

W74

R344

IC2

R346

R348

R201

R206

C334

C331

C332

C333

W18

W59

R202

R325

R301

C216

SUB

R302

W16

X08 B/2

VR3

C315

CN6

W69

W64

W93

W78

W91

W81

W103

W104

W105

W106

W92

W79

W45

W98

W132

W133

W134

W135

SUB.CH

INPUT

SENSITIVITY

C316

W80

W90

W150

W151

W158

W159

C21

C319

R40

Q408

R401

R405

CN5

CN4

IDEL ADJ.

R406

W29

R407

CN7

C403

OPERATION

IDLE SUB

R44

W89

W95

R416

Q13

Q14

Q401

IC3

R11

R27

R26

R25

A B

R404

W70

INPUT

SELECTOR

R12

C16

C19

W96

W144

R21

R29

W97

SUB

R18

R19

R20

VR4

D15

D12

R35

Q406

R15

R22

R410

R36

R37

R13

IC6

R411

W43

W136

SUB.CH

LPF

FREQUENCY

R42

R41

W169

W113

R417

W138

R14

R23

D10

TH1

C24

C17

C26

W123

R16

R34

R32

C20

R419

R418

W122

D13

R39

R24

R17

R43

Q12

W128

W56

Refer to the schematic diagram for the value of resistors and capacitors.

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