KDC-MP4028/MP428/MP6029
3
●
ELECTRIC UNIT (X34-338x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
SYSTEM
µ
-COM
Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone.
IC2
E-VOL
Controls the source, volume, tone.
IC3
A8V REF POWER SUPPLY
Outputs 1.27V.
IC4
POWER IC
Amplifies the front L/R and the rear L/R.
IC5
ILL+B POWER SUPPLY
Outputs 1.225V.
IC6
MUTE LOGIC
Controls logic for muting.
IC7
RESET IC
“L” when detection voltage goes below 3.6V.
IC11
4V PREOUT POWER SUPPLY
Outputs reference voltage for 4V preout.
IC12
SW REGULATOR
Power supply for FL+B and CD mecha D5V.
IC902
SVR/3.3V SUPPLY
Outputs SVR voltage and 3.3V.
Q1,2
B.U. 5V AVR
While BU is applied, BU5V AVR is output.
Q3,11
SW5V
When Q11’s base goes “H”, SW5V is output.
Q4,9
SW14V
When Q9’s base goes “H”, SW14V is output.
Q5,6
AUDIO 8V AVR
When Q6’s 2nd pin goes “H”, A8V AVR outputs 8.0V.
Q7,8
SERVO+B AVR
When Q8’s base goes “H”, AVR 7.5V is output.
Q12
IC12 SW
When Q12’s base goes “L”, IC12 turns on.
Q13
PANEL 5V
When Q13’s base goes “L”, PANEL 5V is output.
Q14
4V PRE+B
If Q15’s emitter shorts GND, Q14’s emitter level goes GND, after that Q14’s B-E level goes
(SHORT PROTECTION)
over 0.6V, Q14 turns on, and Q15 turns off.
Q15,16
4V PRE+B
When Q15’s base goes “H”, 12V is output.
Q101,102
P-ANT SW
When Q102’s base goes “H”, P-ANT SW 14V is output.
Q103,106
P-CON SW
When Q106’s base goes “H”, AVR 14V is output.
Q104,105
P-CON PROTECTION
When P-CON output voltage fallen is detected, protection functions.
Protects Q103 malfunction when P-CON SW turns on.
Q108
SMALL LAMP DET SW
When Q108’s base goes “H”, Q108 turns on.
Q109,110
SERGE DET
When Q109’s base goes “H”, IC4 state is changed into standby.
Q111
B.U. DET
When Q111’s base goes “H”, Q111 turns on.
Q112
ACC DET
When Q112’s base goes “H”, Q112 turns on.
Q113
MUTE DRIVER
When the base goes “L”, preout mute driver turns on.
Q114
MUTE DRIVER
When reset functions, Q114 turns on.
Q115,116
PREOUT MUTE DRIVER
When the base goes “L”, preout mute driver turns on.
Q299
TUNER 8V SW
When Q299’s 2nd pin goes “H”, tuner 8V is output.
Q300,301
AM+B
When Q301’s base goes “H”, AM+B is output.
Q302,303
TUNER 8V
When Q303’s base goes “H”, tuner 8V is output.
Q304
DSI DRIVER
DSI lights when the base is “H”. DSI turns off when the base is “L”.
DSI turns on and off when panel is taken off.
Q305,306
SW ILL+B
When Q306’s base goes “H”, SW ILL+B 11V is output.
Q400~405
PREOUT MUTE SW
When the base goes “H”, preout is muted.
Q905~907
SVR+B
SVR voltage is supplied from the outside.
COMPONENTS DESCRIPTION
