Kenwood KACPS-541, KACX-541 Service manual

POWER AMPLIFIER

KA C-PS54 1 KA C-X54 1

SERVICE MANUAL

Heat sink (F01-1752-01)

Screw (N07-0003-08)

30

FUSE(30A×2)

Fuse (30A) (F52-0015-05)

Cover (F07-1142-12): KAC-X541 (F07-1143-12): KAC-PS541

POWER IN

Screw (N09-4214-08)

5

6

4

7

3

8

2

9

1

0

VOLTFAN

CURRTEMP

RESETREMOTETO H/UID NUMBER

MENU

Screw set (N99-1752-05)

Screw set (N99-1577-15)

Accessory (W01-1606-05)

KA C-PS541/X541

BLOCK DIAGRAM

(X09-5780-10)

IC1

RCA IN

ACH

RCA IN

BCH

RCA IN

ISOLATION

L BUFFER

AMPLIFIER

IC1

ISOLATION

R

AMPLIFIER

IC1

ISOLATION

L

AMPLIFIER

IC1

ISOLATION

R

AMPLIFIER

(X08-4160-10)

6db 6db 27db

V

IC2

IFS

IC2 IC3

IFS

LCD DISPLAY

LOGO LED

5L COMMUNICATION to H/U

I2C COMMUNICATION to AMP

FAN

E2PROM

RST IC

VR4

HIGH PASS

VR5

LOW PASS

VR5

LOW PASS

VR4

HIGH PASS

LCD DRIVER IC

KEY LED+B

VR2

IC3

BUFFER

u-COM

DIP SW

VR3

HIGH PASS

VR3

HIGH PASS

VR1

AMP CONTROL IC

COMMUNICATION

I2C

15V/-15V

IC3

BUFFER

SW5

Q17,18,26

AVR

Q50-53

MUTE2 POP NOISE CIRCUIT

Q41

MUTE1

Q42

MUTE1

Q43

MUTE1

Q44

MUTE1

Q305,307,311

DIFFERENTIAL STAGE

Q306,308,312

DIFFERENTIAL STAGE STAGE

Q405,407,411

DIFFERENTIAL STAGE STAGE

Q406,408,412

DIFFERENTIAL STAGE STAGE

VCC

Q11-16,

901,902

DC/DC CONVERTER

P-SW

Q22

BU5V

Q25

SW5V

Q323,325

B-CLASS STAGE

Q320,322

B-CLASS

Q423,425

B-CLASS

Q424,426

B-CLASS

Q56,57,60,61

DC DETECTOR OVER LOAD

DETECTOR

Q30,31

P. CON CIRCUIT

OVER VOLTA GE CIRCUIT

THERMAL PROTECTION

V-DOWN DETECTOR

I DETECTOR

BU DETECTOR

SP OUT

PCON

BU

COMPONENTS DESCRIPTION

● PREAMPLIFIER UNIT (X08-4160-10)

Ref. No Application / Function Operation / Condition / Compatibility

IC1 (1/4, 2/4) : Ach HPF, (2/4) : ALch buffer, (3/4) : BRch invert buffer IC2 Bch infrasonic filter IC4 (1/4, 2/4) : Bch HPF, (3/4, 4/4) : Bch LPF IC5 Bch buffer IC6 (1/2) : BLch buffer, (2/2) : BRch invert buffer IC7 LCD driver, key scan

IC8 Bch E-VOL IC

2

When AMP-CON SW ON, from H/U (via Lx-Bus) change sound by AMP-CONTROL

KA C-PS541/X541

COMPONENTS DESCRIPTION

● AUDIO UNIT (X09-5780-10)

Ref. No Application / Function

IC1,2 Input isolation amplifier IC3 Microprocessor IC4 Microprocessor reset IC IC6 Current detection circuit voltage amplification IC8 LX communication LX-CLK, LX-DATA-M comparator IC9 AMP I2C communication signal level converter IC10 Switching regulator Q1 14V power supply for LX communication circuit and AMP communication IC Q2 VDD 5V AVR Q7~10 FET drive Q11~16 DC/DC converter Q17,26 +15.6V AVR Q18,27 -15.6V AVR Q20,21 Switching regulator power switch Q22,24 VDD 5V AVR Q25 SW5V Q30,31 Standby, P-CON Q41~44 Mute driver Q50~53 Shock noise prevention Q54 Mute Q56,57 Output DC abnormal voltage detection Q58 Logo LED power supply Q59 LCD illumination power supply Q61 Over current detection and protection Q62~67 Fan operation circuit Q73,77 BU over voltage detection Q74,75 FET drive low start switch Q80~83 LX communication input signal level converter Q84 LX communication circuit power supply and AMP communication IC1 power switch Q85,86,90,92~96,98 Q91 14V power supply for LX communication circuit and AMP communication IC Q210 Ach first stage differential amplifier Q212,311,411,412 Temperature compensation bias Q301~309,312 Q314,319,321 Q315~318,415~418 Q320,322,323,325 Ach final current amplifier Q401~410 Bch first stage differential amplifier Q423-426 Bch final current amplifier Q901,902 DC/DC converter Q905,906,945,946,967

LX communication output signal level converter

Ach first stage differential amplifier

Over current detection and protection

1dB attenuation circuit

Operation / Condition / Compatibility

3

KA C-PS541/X541

MICROCOMPUTER’S TERMINAL DESCRIPTION

● MICROPROCESSOR : 784224YGC117 (X09 : IC3) ◊ Block Digram

AMP communication I/F LX BUS I/F

AMP_SCL

AMP_SDA

Audio control

AUDIO_SCL AUDIO_SDA

AUDIO_MUTE

E2PROM I2C

communication

E2P_SCL

E2P_SDA

Destination, AMP ID

DIP-SW1 DIP-SW2 DIP-SW3 DIP-SW4 MODEL1 MODEL2

Protection control

DC-DET

D-CUR

AB-CUR

Illumination control

LCD-ILL

WHITE-LED

Mute control

MUTE1 MUTE2

ATT1 ATT2 ATT3

AMP µ-com

784224YGC117

LX_REQ_M LX_REQ_S LX_DATA_M LX_DATA_S LX_CLK LX_RST HU_BU

Display data monitor

AD-I AD-V TEMP1 TEMP2 TEMP3 TEMP4 TEMP5 TEMP6

Power supply control

COMM-SW D-PWER POWER-ON 5VSW V_DOWN PCON LX_CON

LCD driver I/F

L_DATA_L L_DATA_A L_CLK L_CE

Fan control

FAN1 FAN2

◊ Terminal Function

Pin No. Pin Name I/O Function Processing Operation Description

1~3 TEMP4~TEMP6 I Temperature detection 4~6 4AVSS - GND 5 L_CE O CE output to LCD driver H : LCD driver CE 6 LX_REQ_S O Data transmit request to H/U H : OFF, L : ON 7AVREF1 - DA reference voltage 8 L_DATA_L I Data input from LCD driver 9 L_DATA_A O Data output to LCD driver 10 L_CLK O CLK output to LCD driver 11 LX_DATA_M I Data input from H/U 12 LX_DATA_S O Data output to H/U 13 LX_CLK I CLK input from H/U 14 LX_BU I LX BUS communication, H/U connect detection H : Not connect (Except master amplifier), L : Connect 15 NC O Not used 16 SDA_AMP I/O Data input/output AMP communication 17 NC O Not used

4

KA C-PS541/X541

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Function Processing Operation Description

18 SCL_AMP I/O CLK input/output AMP communication 19 AUDIO_SCL I/O CLK input/output with audio chip 20 AUDIO_SDA I/O Data input/output with audio chip 21 AUDIO_MUTE O Mute output to audio chip H : Mute OFF, L : Mute ON 22 E2P_SCL I/O CLK input/output with E2PROM 23 E2P_SDA I/O Data input/output with E2PROM 24 NC O Not used 25~28 29 MODEL1 I Model setting 1 30 MODEL2 I Model setting 2 31,32 NC O Not used 33 VSS1 - GND 34~37 NC O Not used 38 LCD-ILL O LCD backlight switch H : ON, L : OFF 39 WHITE-LED O Triangle illumination switch H : ON, L : OFF 40 NC O Not used 41~43 ATT1~ATT3 O Output attenuate due to rise in temperature 1~3 H : Attenuate, L : Not attenuate 44,45 NC O Not used 46 COMM-SW O Communication IC power switch H : ON, L : OFF 47~50 NC O Not used 51 D-PWER O D class amplifier power supply control H : ON, L : OFF (2ch/4ch L fixed) 52 DC-DET I Speaker output DC voltage detection H : Normal, L : Abnormal 53 NC O Not used 54 POWER-ON O Amplifier power supply control H : ON (D/AB class), L : OFF 55 5VSW O 5VSW H : OFF, L : ON 56 MUTE1 O Amplifier section input stage mute control H : OFF, L : ON 57 MUTE2 O Driver stage pop-noise mute control H : OFF, L : ON 58 FAN1 O Fan rotation control H : Operate, L : Stop 59 FAN2 O Fan speed control H : Low speed, L : High speed 60 RESET - Hard reset H : Normal, L : Reset 61 PCON I Amplifier power control H : OFF, L : ON 62 LX_CON I LX-BUS communication control H : OFF, L : ON 63 LX_REQ_M I Data receive request from H/U H : ON, L : OFF 64 NC O Not used 65 V_DOWN I Momentary power down detection H : ON (Power down detection), L : OFF (L fixed) 66 NC O Not used 67 VSS0 - GND 68 VD1 - VDD 69 X2 - Main clock input 1 70 X1 - Main clock input 2

DIP-SW1~DIP-SW4

I AMP address setting

5

KA C-PS541/X541

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Function Processing Operation Description

71 TEST - Flash ROM writing 72 XT2 - Not used 73 XT1 - Not used 74 VDD0 - VDD 75 AVDD - VDD 76 AD-I I First current detection (for display) 77 AD-V I BU voltage detection (for display) 78~80 TEMP1~TEMP3 I Temperature detection 1~3

◊ Logic Table

1) Destination

The destination in AMP does not mean the sales regions but specific models. The following are the models. When reset is released, it is checked only once.

Model name MODEL1 (29pin) MODEL2 (30pin) KAC-PS811D/X811D Low Low KAC-PS521/X521 Low High KAC-PS621/X621 High Low KAC-PS541/X541 High High

2) AMP ID

AMP ID is checked only ohce at the time reset is released or when the microcomputer is released from the low consumption mode. When set to AMP ID 8/9 no remote control is possible.

DIP-SW1 DIP-SW2 DIP-SW3 DIP-SW4

AMP ID

(25pin) (26pin) (27pin) (28pin) 0 High High High High 1Low High High High 2 High Low High High 3Low Low High High 4 High High Low High 5Low High Low High 6 High Low Low High 7Low Low Low High 8 High High High Low 9Low High High Low

3) Fan speed

Operation FAN1 (58pin) FAN2 (59pin) Stop Low High/Low Low speed High High High speed High Low

6

AD-I

(2/2)

IC6

(1/2)

IC6

AMP RECT

MPU AD-PORT OUTPUT

VOLT AGE DETECTION

LEVEL

10u35

270

1K

10K

7

5

6

15K

0.01 0.01

10K

1

8

1K

68

3

2

220

L5

4

+

● Current detection circuit

Amplify and rectify potential differences at two points in the primary-side current circuit and send it to the AD-port of the MPU and obtain data for displaying current value.

KA C-PS541/X541

CIRCUIT DESCRIPTION

● Constant current output circuit

Remove troubles caused by the potential differences between the constant current output and the GND, so that the GND potential differences between the H/U and the AMP is not overlapped in the AMP to H/U communication.

● I2C buffer

Using an IC for I2C communication, between-AMP communication is conducted so that there will be no trouble from GND potential differences.

J3

12

to OTHER AMP TRANSMISSON RECEIVE

J4

42 3

1

10

11

957 8

6

3421

78

6105

11

13

9

to H/U

REQC

H/U-GND

H/U GND

270 CLK

270

DATA

10u25

4.3K

D91

4.3K

D93

IC9

47 47

100K

1

Q95

Q96

VCCSX

1.8K

6

785

SY

RX

2

3

12K

20K

CONSTANT CURRENT

TY

RY

GND

TX

4

1.5K

Q93

Q90

10K

to MPU

1.8K

TRANSMISSON RECEIVE

10K

1.5K

from MPU

AMP GND

10K

BOTH DIRECTION BUFFER

ADJUSTMENT

2.5mV

After Power on PC board

No. Item Alignment Point Method Align For Note Fig.

VR5 (ALch) VR6 (ARch) Connect a DC voltmeter VR7 (BLch) between check land. 2 minutes (X09-578) VR8 (BRch)

1 IDEL CURRENT

7

A B C D E

KAC-PS541/X54 1

1

PC BOARD (COMPONENT SIDE VIEW)

PREAMPLIFIER UNIT X08-4160-10 (J76-0011-02)

C200

CN1

103A

503C

103A

200mV

5V

INPUT SENS

200Hz

HI PASS

50Hz

200mV

5V

INPUT SENS

C115

C114

R112

R233

C28

C109

R213

R217

C110

R114

14

R215

IC1

R129

R128

R53

R54

R110

VR5

VR4

VR3

C108

78

1

Ach

R104 C106

R126

C29

R103

C105

R122

R107

R9

S4

S5

R102

C104

R108

R105

C103

C107

S1

MONO ST ON

S2

1

MONO ST

S3

ON OFF

1

ON OFF

C102

R101

R116

R115

R111

OFF

C101

1

Ach

HPF

1

Bch

1

B M S I.S.F

R247

C906

R248

30 1

2

S7

S8

S9

124

3

R205

R204 R203

R202

116

ED2

17

64

IC7

R209

49

R208

4

32

33 48

C201

R211

R201 C204

C203 C202

R206 R207

R200

R210

503C

R38

R33

R35 R36

R42

R37

C32

14 8

17

C25

R23

R25

C23

R21

R32

IC4

C34

R27

C30

C31

C33

C72

C73

R242

R24

R26

D2

5

CN2

12

C52

1

R52

R50

R14

C53

6

8

IC6

4

5

WH2

13

C51

R55

R15

R245

R246

C75

R51

R249

R250

C27

C21

R241

C24 C22

C16

R243

C76

R20

R13

R244

50Hz 200Hz

R28R29

R22

C17

R61

C49

HI PASS

R43

C36

C26

C20

85

C2

R17

14

R12

C14

C50 R16

IC5

LOW

503C

C15

R60

C1

R19

PAS S

50Hz 200Hz

C12

C905

11 20

C904

IC8

C10

C903

C902

R230

C901

VR1

VR2

C900

R232

Bch

S6

HPF

R240 R239

R237

C7

C9

R5

110

C11

R231

1

OFF LPF

C63

C61

14 8

C62

R7

R8

R238

C18

IC2

17

C19

C6

C5

R4

R3

C3

C4

R2

R1

R18

D1

C64

C8

X08-4160-10

R6

Ref. No. Address

IC1 2D IC2 6D IC4 5C IC5 6C IC6 6B IC7 4B IC8 6D

7

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

8