Kenwood XXV-03-A Service manual

POWER AMPLIFIER

XXV-03A

SERVICE MANUAL

Heat sink (F01-1795-01)

Fuse (25A) (F52-0014-05)

Screw (N07-0003-08)

POWER IN

Subwoofer Power Amplifier

Screw (N09-4214-08)

VOLTFAN

CURRTEMP

"eXcelon" is not printed on European Model

* Dressing plate (A21-xxxx-xx)

RESETREMOTETO H/UID NUMBER

* Cover (F07-xxxx-xx)

"eXcelon" is not printed on European Model

Subwoofer

Power

lifie

* Depends on the destination. Refer to the parts list.

Screw & Wrench key set (N99-1770-15)

Screw set (N99-1577-15)

Accessory (W01-1606-05)

XXV-03A

BLOCK DIAGRAM

LINE IN

LINE OUT

to H/U

REMOTE

(X09-5930-10)

IC15

I2C BUFFER

(X08-4230-10)

IC1

ISO I.F.S B.R.F INV

15/25Hz FREQ

ED1

LCD

BACK LIGHT

IC6

LCD DRIVER

IC16

COMPARATOR

Q1-4

ISOLATOR

IC10

IC11

RESET

THERMAL PROTECT

CORRECTIC

IC2 IC2IC1

ON/OFF OFF/6/12 NOR/REV

FREQ

IC5

L.P.F

ACCRESSROM SWITCH

IC4

IC3

AMP CONT.

ON/OFFLEVEL

LED

FAN

AVR 5V SW5V 15V

Q20 84,110

+5V SWITCH

Q106-108

AVR

+5V AVR

IND

FAN

Q10 IC2,3 IC4,5

COMPARATOR

CURRENT DET.

D.D CONu-COM

IC2Q9

TRIANGLE WAVE

INPUT VOLTAGE MEASURE DET.

MUTE DRIVER

Q80 IC14 Q63 Q66

POWER SWITCH

IC13

15V

IC3

Q25,26,

29,30,

Q83

FAN CONTROL

DEAD TIME CONT

Q52-55

Q15,18,19,21,22,27,

28,37-40,42-45,48-51

AMPMUTE

OVER

IC6

LOAD DET. DET.

OVER VOLTAGE

Q73,

D PWR

Q62

78 DC

OFFSET

P CON DET. DOWN VOLTAGE DET.

SP OUT

P CON BATT GND

COMPONENTS DESCRIPTION

● PREAMPLIFIER UNIT (X08-4230-10)

Ref. No Application / Function Operation / Condition / Compatibility

IC1 ISF Cutting super-low range of audio signal IC2 (1/4~3/4) BRF Cutting bandwidth of audio signal IC2 (4/4) INV Phase reversal of audio signal IC3 OP amplifier Voltage amplification, Buffer IC4 E-VOL Electronic volume IC5 LPF Cutting high-range of audio signal IC6 LCD driver LCD driver

● AUDIO UNIT (X09-5930-10)

Ref. No Application / Function Operation / Condition / Compatibility

IC1 Isolation amplifier Prevent noise from GND potential difference IC2 (1/2) Triangular wave generation Reference signal for digitizing analog signal IC2 (2/2) Error amplifier Error is compensated by the feedback from output IC3 Comparator, Triangular wave generation Digitizing by comparison of analog signal and triangular wave

XXV-03A

COMPONENTS DESCRIPTION

Ref. No Application / Function Operation / Condition / Compatibility

IC4,5 NAND D class section reverse wave, deadtime, generation and rectification IC6 Comparator Short circuit detection of SP output IC7 Signal amplification For SP output short-circuit detection, send the output to comparator IC10 Element operation control Communication, display, protection, etc. control IC11 Reset Reset signal is output when voltage goes below standard voltage

IC13 DC/DC converter

IC14 Signal amplification To have µcom display current value, amplify potential differences of GND IC15 Bi-directional buffer Send/Receive data and clock between AMP IC16 Comparator Receive from H/U data and clock Q1,2,5,7 Digital signal transmission Send LX-REQ-M signal to H/U Q3,4,6,8 Digital signal transmission Send LX-DATA-S signal to H/U Q9 Mute Mute drive signal generation Q10 Mute Turn audio signal OFF Q15,18,19,21,22,27, Q28,37~40,42~45 Q16,17 Voltage control Match the beginning of the fall to +15V when -15V power supply is OFF Q20 Voltage control 5V power supply ON/OFF Q23,24,35,36,41,83 Q25,29,84 AVR +15V Q26,30,110 AVR -15V Q31,33,46,109 Voltage control D class section predrive stage power supply ON/OFF Q47 AVR D class section first stage supplementary power supply Q52-55 Voltage current converter Over current detection when SP is shorted Q57,58,60,61, Q64,65,67~70 Q59,63 Voltage control Q62 Voltage detection Pcon detection Q66 Voltage detection Pcon over voltage detection Q71,72 Waveform shaping For SP output short-circuit detection, send the output to comparator Q73,78 Voltage detection DC detection of output Q74-77 Current amplification Switching FET drive current amplification Q79,80 Voltage control DC/DC converter power supply ON/OFF Q81,82 Voltage control DC/DC converter drive waveform ON/OFF Q88,89,98,99 Voltage control 5L digital signal reception Q95,96 Voltage control Q97 Voltage control Normally 15V power supply and over voltage control Q102,111 Voltage control Q103,104 Voltage control LCD backlight and illumination LED control Q106-108 AVR µcom system 5V power supply.

Signal amplification, switching D class section voltage or current amplification

Voltage control Fan voltage ON/OFF and limiting over voltage

Switching DC/DC converter switching

Voltage on secondary side, which produces the drive signal for switching element, will be limited to below standard voltage

In order to have µcom display voltage value, send voltage to it only when 5V SW ON

When Comm-SW of µcom is ON, turn communication system power supply ON

When Comm-SW of µcom is ON, turn communication system 5V power supply ON

XXV-03A

MICROCOMPUTER’S TERMINAL DESCRIPTION

● MICROPROCESSOR : 784224YGC117 (X09 : IC10) ◊ 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

ATT1 ATT2 ATT3

Illumination control

LCD-ILL

WHITE-LED

Mute control

MUTE1 MUTE2

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

XXV-03A

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

XXV-03A

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

D59

(2/2)

IC14

(1/2)

IC14

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.

XXV-03A

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

D76

4.3K

D77

IC15

47 47

100K

VCCSX

1.8K

785

12K

20K

CONSTANT CURRENT

GND

1.5K

10K

to MPU

1.8K

TRANSMISSON RECEIVE

10K

1.5K

from MPU

AMP GND

10K

BOTH DIRECTION BUFFER

A B C D E

XXV-03A

PC BOARD (COMPONENT SIDE VIEW)

PREAMPLIFIER UNIT X08-4230-10 (J76-0012-12)

C35

VR1 VR2VR3

503C

OFF

C34

R48

OFF

6dB

-12dB

R49

R47

R50

C31

C36

B.R.F

IC5

R51

C33 8

C38

103A

I.N.V

C39

R56

ON OFF

AMP CONT

OFF

C20

R55

C23

C47

C22

R67

C46

C45

IC4

C12

C44

C21

R24

R38 R41

R44

IC3

C43

C19

R23

C42

C26 R40

C18

R22

C28

C41

2011

C49

R61

C14

R18

C11

R57

C16

R64

R63

R62

C17

R16

C13

R34

R29 R27 R28

R21

C15

C40

R53

C29

R45

R13 R14

IC1

R42

C27 R39

R37 C24 C30

R36

C25

IC2

C10

R32 R33

122

CN1

S1 S5 S6

I.F.S I.F.S

R20

C37

R54

R52

R43

B.R.F LOW PASS INPUT SENS

200Hz 40Hz 200Hz 50Hz 5V200mV

503C

15Hz25Hz

C32

R46

R25

R26

C48

R11 R12

R66

49 32

R58

R65

C5 R10 R5 R6 R7 R8

R59 R60 C7

ED1

R17

R19

3348

IC6

116

241

X08-4230-10

Ref. No. Address

IC1 2B IC2 3B

WH1

IC3 3D IC4 2D IC5 2C IC6 6C

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

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