Kenwood KACPS-521, KACX-521 Service manual

POWER AMPLIFIER

KA C-PS52 1 KA C-X52 1

SERVICE MANUAL

Heat sink (F01-1751-01)

Screw (N07-0003-08)

FUSE(30A×2)

POWER IN

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

Cover (F07-1138-12): KAC-X521 (F07-1139-12): KAC-PS521

Screw (N09-4214-08)

VOLTFAN

CURRTEMP

RESETREMOTETO H/UID NUMBER

Screw set (N99-1752-05)

Screw set (N99-1577-15)

Accessory (W01-1606-05)

KA C-PS521/X521

(X09-5760-10)

BLOCK DIAGRAM

to H/U

to POWER AMP

BAT

GND

P-CONT

IC1,10 IC1

I.S.A I.F.S

(X08-4150-10)

V PROT.

L.P.F

IC5

H.P.F

ED1 IC7

LCD

IC6

Q356,358

IC2 Q61

DC/DC CONVERTER

LCD DRIVER

u-COM

Q66

5V AVR

FAN AVR FAN

IC3,4,6

Q69

SW 5V AVR

AMP CONT.

TEMP PROT.

+15V AVR

Q62

-15V AVR

Q101,102

MUTE

DC PROT CURRENT PROT

POWER AMP

COMPONENTS DESCRIPTION

● PREAMPLIFIER UNIT (X08-4150-10)

Ref. No Application / Function Operation / Condition / Compatibility

IC1 Infrasonic filter Controlled by microprocessor IC3 Tone and volume variable IC4 6dB voltage amplification

IC5

IC6

IC7 LCD driver Controlled by microprocessor

● AUDIO UNIT (X09-5760-10)

Ref. No Application / Function Operation / Condition / Compatibility

IC1 Buffer IC2 DC/DC converter IC3 AMP communication buffer

HPF LPF Lch : 6dB voltage amplification Rch : Signal 180 reverse and 6dB voltage amplification

KA C-PS521/X521

COMPONENTS DESCRIPTION

Ref. No Application / Function Operation / Condition / Compatibility

IC5 H/U communication buffer IC6 Microprocessor IC7 Reset IC IC8 E2PROM IC9 Current detection IC10 Isolation amplifier Q50 5V AVR Q51~54 DC/DC output driver Q55~60 DC/DC Q61 +15V AVR Q62,63 -15V AVR Q64,65 DC/DC converter (IC2) ON/OFF Controlled by microprocessor Q66,68 5V AVR Q69 5V AVR ON/OFF Q70,71 Power supply detection Q81 +15V AVR Q91,92 When P-CON is OFF, DC/DC driver stop speedy Q97 AMP communication stability power supply Q101,102 Mute Q103~112 A class first stage amplifier Q113~118 A class 2nd stage amplifier Q119,120 Final temperature compensation Q121~124 Amplifier current detection Q125~132 Final driver Q133~140 Final Q141 Mute control Q142~145 Amplifier limiter Q146,147 Amplifier current detection Q148,149 DC detection Q301~307 H/U communication output driver Q313 H/U communication output driver Q314 H/U communication ON/OFF Q341~344 H/U communication input driver Q346 H/U communication output driver Q347~349 AMP and H/U communication ON/OFF control Q351,352 BATT voltage output Q353~358 Fan stability power supply Q403 LCD backlight LED control Q404 LED control

KA C-PS521/X521

MICROCOMPUTER’S TERMINAL DESCRIPTION

● MICROPROCESSOR : 784224YGC117 (X09 : IC6) ◊ 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

KA C-PS521/X521

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

KA C-PS521/X521

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

AD-I

D309

(2/2)

IC9

(1/2)

IC9

AMP RECT

MPU AD-PORT OUTPUT

VOLT AGE DETECTION

LEVEL

10u35

270

10K

15K

0.01 0.01

10K

13K

470

● 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-PS521/X521

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.

to OTHER AMP TRANSMISSON RECEIVE

42 3

957 8

3421

6105

to H/U

REQC

H/U-GND

H/U GND

270

CLK

270

DATA

10u25

4.3K

D301

4.3K

D302

IC3

47 47

100K

Q301

Q303

VCCSX

1.8K

785

12K

Q305

20K

CONSTANT CURRENT

1.8K

GND

1.5K

from MPU

Q307

10K

1.5K

AMP GND

to MPU TRANSMISSON RECEIVE

10K

BOTH DIRECTION BUFFER

ADJUSTMENT

2.5mV

After Power on PC board

No. Item Alignment Point Method Align For Note Fig.

1 IDEL CURRENT

VR1 (Lch) Connect a DC voltmeter between

VR2 (Rch) check land A, B. 2 minutes (X09-576)

A B C D E

KAC-PS521/X52 1

PC BOARD (COMPONENT SIDE VIEW)

PREAMPLIFIER UNIT X08-4150-10 (J76-0010-12)

CN1

122

124

R101 R102 R103

R104

ED1

R114

IC7

33 48

R115

C104

R111

R105 C101

R107 R108

R112

R106

C102 C103

R11

C105

C31

R12

103A

503C

200mV

INPUT SENS

C32

HI PASS

200Hz

50Hz

200Hz50Hz

LOW PASS

C68

C67

R64 C12

R63

C66

C65

R66

R65

C63

C64

VR2

VR1

VR3

R39 R40

IC1

C11

114

HPF

R33

ON OFF

OFFON

C107

R117

STMONO

I.S.F

ANP CONT

LPFOFF

R109

R110

CN2

WH2

C35

R31

C25

C19

R72

R42

R41

R43

R74

C33

C74

R44

R46

C34

C28

R76

C75

R45

14 8

IC5

C27

R23

R27 R25

R28 R26

C22 R24

C24

R30

R29

C23 C21

C73

R32

R73

C39

R77

R52

C20

C26

C29

R17

R70

R79

C17

R55

R69

R78

R19

C48

R22

R21

C10

R10

C40

C18

C37

IC4

C38

IC6

C49

C41 C42

C30

R20

C43 C44 C45

R18

R56

R38

R34

C61

R13

C16

R116

IC3

C13

C15

R14 R15 R16

X08-4150-10

Ref. No. Address

IC1 2D IC3 6D IC4 6D IC5 6C IC6 6D IC7 4B

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

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