Kenwood XXV 03 A Service Manual

Page 1

POWER AMPLIFIER

xxv_03 A KENWOOD

Kenwood Corporation
SERVICE MANUAL

© 2005-4 PRINTED IN JAPAN
353-0282-00 (N) 1553

Heat sink
(F01 -1 795-01)

4k , |_r |_I
3 9- 3 $1M will W.
on European Modei
Screw Screw " Dressing plate
(N07-0003-08) (N09-4214-08) (A21 -xxxx-xx)

1
© -@@ i
, .@9°@©@I_L

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

Fuse (25A)
(F52»0014-05)

" Cover
(F07-xxxx-xx)

J "eXCeIDn" is not printed

on European Modei

I§ Screw set
039$ '7 (N99-1577-15)

/fi Accessory
@7 (W01-1606-05)

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

Page 2

XXV-03A

BLOCK DIAGRAM

(x057423040)

(Xogrssaorw) I

IND
LINE IN © -
O '- I I
FAN
35% @' II I O; _______________
© ll ,g I Im
I II Ica AV 33 MUTE COMPARATOR TIE/TED AMP
I BEITVEH LEVEL Wop; com
I I 073. 1-0
I I I I 09 IC2 78
fl § 05255 OVER DC
I I- - -jj:-___| I Mia my Ego 3;;ng
| ______ ___ _____ g
I n
|
I ms
062
Q W i2? 0 035m 35?
MW W W ESIIIE'E SEW IgggggE Emmet gggAeE Egg/ICE
025.26 I
IcIu 2930, ICIGI I
I ICIs 84110
REMOTEI m urCOM DDCDN I 5U 1
01067108 d 9 f

IcII
RESET ROM ACCRESS
Ic CORRECT SWITCH

COMPONENTS DESCRIPTION

0 PREAMPLIFIER UNIT (X08-4230-10)

SP OUT

P CON

BATT
GND

Rel. 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
ICS LPF Cutting high-range of audio signal
IC6 LCD driver LCD driver
0 AUDIO UNIT (X09-5930-10)
Rel. 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