4
KDC-MP4036U/MP435U/X491/W4537UA/W4537UAY
/W4537UG/W4537UGY/W4737U/W4737UY
COMPONENTS DESCRIPTION
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ELECTRIC UNIT (X34-466x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
SW REG
Outputs 5.0V. Power supply for D5V, FL+B and USB5V.
IC2
A8V REF Power Supply
Outputs 1.27V.
IC100
Reset IC
Lo when detection voltage goes below 3.6V.
IC102
System µ-COM
Controls FM/AM tuner, the changer, CD mechanism, USB, panel, volume and tone.
IC103
Muting Logic IC
Controls logic for muting.
IC200
Hi-side SW
Overcurrent protection of USB power supply.
When pin1 goes Hi, USB5V is ON.
IC300
E-VOL
Controls the source, volume and tone.
IC301
OP-AMP
Reference supply for 4V pre-out.
IC400
Power IC
Amplifi es the front L/R and the rear L/R to 50W maximum.
IC500
RDS Decoder
Decodes RDS signal.
IC700
D/A Converter.
For CD and USB source.
IC702
iPod Authentication Coprocessor
For iPod authentication.
IC703
Digital Audio Receiver
For CD source.
IC704
OP-AMP
L.P.F.
IC705
Point REG
Outputs 5.0V. Power supply for D/A converter.
IC708
DC Voltage REG
Outputs 3.3V. Power supply for 3.3V.
IC709,710
Inverted 3-state Output
Converts 3.3V to 5V.
IC711
SOC (System On Chip)
Decodes MP3 or other fi les of audio/decompression standards by software based
architecture.
IC712
Quad 2-input AND Gate
Convert 5V to 3.3V.
IC714
SDRAM
SDRAM for SOC.
IC715
NOR Flash ROM
NOR fl ash ROM for SOC.
IC716
LDO REG
Outputs 1.8V. Power supply for SOC.
Q1,2,16
A8V AVR
When Q16’s base goes Hi, A8V AVR outputs 8.0V.
Q3,4
BU5V AVR
While BU is applied, BU5V AVR o5V.
Q5,7
Servo+B AVR
When Q7’s base goes Hi, Servo+B AVR outputs 7.5V.
Q6,17,20,21
SW14V
When Q17’s (or Q21's) base goes Hi,SW14V outputs 14V.
Q8,9
Serge Protect for IC1
Output 20V when BU is over 20V.
Q10,11,12,18
ILL+B AVR
When Q18’s base goes Hi, ILL+B outputs 10.5V.
Q13,14
SW5V
When Q14’s base goes Hi, SW5V o5V.
Q15
PAN5V
When the base goes Lo, PAN5V outputs 5V.
Q50,58
P-CON SW
When Q50’s base goes Hi, AVR outputs 14V.
Q51
BU DET
When the base goes Hi, Q51 is turned on.
Q52,54
P-CON Protection
When P.CON output voltage decrease is detected, output protection is made.
When P.CON SW is ON, malfunction of Q58 is protected.
Q53,56
P-ANT SW
When Q53’s base goes Hi, P-ANT SW outputs 14V.
Q57
ACC DET
When the base goes Hi, Q57 is turned on.
Q59
Serge DET
When the base goes Hi, BU DET is turned off.
Q60
Small Lamp DET SW
When the base goes Hi, Q60 is turned on.
Q200
DSI
When the base goes Hi, security indicator lights.