Kenwood KACPS-520, KACPSX-520, KACX-520 Service manual

POWER AMPLIFIER

KAC-PS520/X520

SERVICE MANUAL

30

ON

OFF

INFRASONIC FILTER

LPF

OFF

HPF

B.M.S.

+12dB

OFF

REMOTE

OPERATION

MONO(L ch)

STEREO

GND

LINE OUT EXT.AMP.CONT.LINE IN

L

R

L

R

LEFT

BRIDGED

SPEAKER

OUTPUT

RIGHT

POWER IN

P.CON

BATT.

G

N

D

F

U

S

E

(

30Ax2

)

KAC-PS520/X520

(X09-) IC11 : u-COM

PORT NAME I/O FUNCTION OPERATING CONDITION

1

+5V SW

O Controls small-amount current. "L" : SW 5V on.

2- --

-

3

FAN O Controls fan rotation.

"H" : Fan on.

4- --

-

5

D VOLTAGE

I Detects class-D over-voltage.

"L" : Over-voltage detection.

6 V DOWN I

Detects momentary power down. "H" : Momentary power-down detection.

7

D CURRENT

I Detects class-D over-current.

"L" (Class-D power on) : Over-current detection.

8

AB VOLTAGE

I Detects class-AB over-voltage.

"L" : Over-voltage detection.

9

AB CURRENT I Detects class-AB over-current.

"H" : Over-current detection.

10 BLUE O Controls BLUE of variable illumination.

"H" : Illumination on.

11

GREEN O Controls GREEN of variable illumination.

"H" : Illumination on.

12 RED O Controls RED of variable illumination.

"H" : Illumination on.

13

TEST - -

-

14

RESET

- Resets.

"L" : Reset.

15

XIN - -

-

16 XOUT - -

-

17

VSS - -

-

18 VAREF - A/D reference.

-

19

ADIN 1 I Detects temperature.

"H" : Unusual temperature detection.

20 ADIN 2 I Detects temperature.

"H" : Unusual temperature detection.

21

ADIN 3 I Detects temperature.

"H" : Unusual temperature detection.

22 ADIN 4 I Detects temperature.

"H" : Unusual temperature detection.

23

---

-

24 BASS 12dB I Stabilizes BMS +12dB.

"H" : BMS +12dB stabilization.

25

BASS REMO I Being remote-controlled from BMS head unit.

"H" : remote control available.

26 BASS OFF I Releases boost.

"H" : Boost off.

27

D POWER O Controls class-D amplifier.

"H" : Class-D amplifier on.

28,29 - - -

-

30

POWER O Controls power amplifier.

"H" : SW 14.4V on.

31

COM HU I Measures the head unit pulse.

-

32

OFFSET CON O Controls bass boost frequency offset.

"H" : Offset on.

33

BASS CON A O Controls bass boost frequency offset.

-

34

BASS CON B O Controls bass boost frequency offset.

-

35,36

---

-

37

STAND-BY

I Cancels stop mode by P.CON on.

"L" : P.CON on or BACK-UP over-voltage detection.

38,39

---

-

40

VDD - VDD.

-

41

TACT SW I Switches color.

"H" : SW on.

42

MUTE 2

O Controls driver stages.

"L" : Mute on.

43

MUTE 1

O Controls amplifier input mute.

"L" : Mute on.

44

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-

MICROCOMPUTER'S TERMINAL DESCRIPTION

PORT

No.

2

KAC-PS520/X520

ADJUSTMENT (KAC-PS520/X520)

Connect a cassette receiver or other receiver.

No. ITEM

1

IDEL

CURRENT

INPUT

SETTINGS

-

OUTPUT

SETTINGS

Connect a DC

voltmeter

between emitter

terminals of

Q35/Q36 (L/R)

and J2 (SP.OUT,

L+/R-).

RECEIVER SETTINGS

VOLUME : 0

ALIGNMENT

POINTS

VR1 (L ch)

VR2 (R ch)

(X09-)

ALIGN

FOR

2.5mV (a)

FIG.

3

KAC-PS520/X520

(L) VR1

(R) VR2

J2

DC Voltmeter

(a)2.5mV

DC Voltmeter

(a)2.5mV

L

Q35

Q36

R

ADJUSTMENT

4

ACEBD

CN1 CN2 CN3

S1

X08-4090-10 (J74-1362-11)

CN1

S1

CN2CN3

VR1

VR2

VR3

LPF

BMS

SENS

VR4

BRF(X810D)

HPF(X520)

161166

VR2

VR1

BMS

SENS

16

VR3

LPF

HPF(X520)

BRF(X810D)

VR4

1166

PC BOARD

1

Component side view

2

3

4

Foil side view

5

6

7

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

5