Kenwood KDC-MP4032, Service Manual

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KDC-MP4032
3
COMPONENTS DESCRIPTION
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ELECTRIC UNIT (X34-4180-10)
Ref. No. Application / Function Operation / Condition
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 to 50W or 47W maximum.
IC5 ILL+B Power Supply Outputs 11.25V.
IC6 Muting logic IC Controls logic for muting.
IC7 Reset IC “L” when detection voltage goes below 3.6V or less.
IC11 4V preout Power Supply Outputs reference voltage for 4V preout.
IC12 SW Regulator Power supply for CD mechanism and VFD.
IC902 SVR & 3.3V Supply Outputs SVR voltage and 3.3V.
Q1,2 B.U.5V AVR While BU is applied, BU5V AVR o5V.
Q3,11 SW5V When Q11’s base goes Hi, SW5V o5V.
Q4,9 SW14V When Q9’s base goes Hi, SW14V outputs 14V.
Q5,6 AUDIO8V AVR When Q6’s 2nd pin goes Hi, A8V AVR outputs 8.0V.
Q7,8 SERVO+B AVR When Q8’s base goes Hi, S+B AVR outputs 7.5V.
Q12 SW for IC12 When Q12’s base goes Lo, IC12 is turned on.
Q13 PANEL5V When Q13’s base goes Lo, PANEL5V outputs 5V.
Q14
4V PRE+B If Q15’s emitter is short-circuited to GND, Q14’s emitter goes to GND, then between Q14’s
Short-circuited Protection base and emitter have more than 0.6V, and Q14 is turned on and Q15 is turned off.
Q15,16 4V PRE+B When Q15’s base goes Hi, 4V PRE+B outputs 12V.
Q101,102 P-ANT SW When Q102’s base goes Hi, P-ANT SW outputs 14V.
Q103,106 P-CON SW When Q106’s base goes Hi, AVR outputs 14V.
Q104,105 P-CON Protection
Sets output protection when P-CON output is grounded.
Protects Q103’s malfunction when P-CON SW is turned on.
Q108 Small Lamp Det SW When Q108’s base goes Hi, Q108 is turned on.
Q109,110 Serge Det. When Q109’s base goes Hi, IC4 is changed into STANDBY source.
Q111 BU Det When Q111’s base goes Hi, Q111 is turned on.
Q112 ACC Det When Q112’s base goes Hi, Q112 is turned on.
Q113 Mute-Driver When a base goes Lo, preout mute driver is turned on.
Q114 Mute-Driver Q114 is turned on by RST.
Q115,116 Preout mute driver When a base goes Lo, mute driver is turned on.
Q299 Tuner8V SW When Q299’s 2nd pin goes Hi, Tuner8V outputs 8V.
Q300,301 AM+B When Q301’s base goes Hi, AM+B is output.
Q302,303 Tuner8V When Q303’s base goes Hi, Tuner8V outputs 8V.
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 B When Q306’s base goes Hi, SW B outputs 11V.
Q400~405 Preout mute SW When a base goes Hi, Preout is muted.
Q905~907 SVR+B Supplies SVR voltage from the outside.