Kenwood KDC-MP538U Service Manual page 3

● ELECTRIC UNIT (X34-588x-xx)
Ref. No. Application / Function
IC11 Audio8V REF Power Supply
IC21 REG
IC61 SW REG
IC71 SW REG
IC101 OP-AMP
IC211 Hi-side SW
IC301 RDS decoder IC
IC331 OP-AMP
IC451 E-VOL & Source Selector
IC501 Power IC
IC601 System μ-COM
IC602 Reset IC
IC603 ROM Correction
IC604 Muting Logic IC
IC605 Level Shift (3.3V→5V)
IC607 Level Shift (5V→3.3V)
IC700 USB μ-COM
IC750 iPod Authentication Coprocessor
Q11 AUD8V AVR
Q12 AUD8V AVR SW
Q13 AUD8V AVR SW
Q21,22 BU5V AVR
Q23,24 PON5V
Q31,32 SERVO+B AVR
Q33,34 SERVO+B SW
Q41,42 ILL+B AVR
Q43,44 ILL+B SW
Q51,52 SW16V
Q71,72 FDC+B AVR
Q81,82 FL+B SW
Q101,102 4VPRE+B
Q103 4VPRE+B Protect
Q104,105 4VPRE+B SW
Q121 BU DET SW
Q122 Surge DET SW
Q123 ACC DET SW
Q141,144 P-CON SW
Q142,143 P-CON Protect
Q145,146 Power Antenna SW
Q151 Small-lamp DET SW
COMPONENTS DESCRIPTION
Outputs 1.27V.
Power supply for IC700. (USB μ-COM)
Power supply for D5V. (To USB and PANEL)
Power supply for FL+B. (To PANEL)
For IC451's 4V reference voltage supply.
Detects USB's over-current.
Decodes RDS.
For AGC of spectrum analyzer.
Controls the source, volume, and tone.
Amplifi es the front L/R and the rear L/R to 50W maximum.
Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone.
Lo when detection voltage goes below 3.6V.
Controls muting logic.
USB and CD mechanism control.
iPod authentication.
When Q13's and Q12's bases goes ON, A8V AVR outputs 8.0V.
When Q13's base goes Hi, current is supplied to IC11.
When Q13's base goes Hi, Q12 and Q11 are ON.
While BU is applied, BU5V AVR outputs +5V.
When Q24's base goes Hi, PON5V outputs +5V.
When Q33's and Q34's bases go ON, AVR outputs 8V.
When Q34's base goes Hi, Q33 is ON.
When Q43's and Q44's bases go ON, AVR outputs 10V.
When Q44's base goes Hi, Q43 is ON.
When Q9's and Q34's bases go ON, voltage is applied. (MAX16V)
When Q43's base goes ON, AVR outputs 9V. (FL fi lament)
When Q81's base goes Hi, FL+B outputs 53V.
When Q104's and Q105's bases go ON, 4VPRE+B is output. (MAX12V)
When 4VPRE+B has over-current, Q103 turns Q101 off.
When Q105's base goes Hi, Q104 is ON.
When the base goes Hi, BU voltage is detected.
When the base goes Hi, surge voltage is detected.
When the base goes Hi, ACC voltage is detected.
When Q144's base goes Hi, AVR outputs 14V.
Protects Q141 when P-CON output is grounded.
When Q146's base goes Hi, power antenna SW outputs 14V.
When the base goes Hi, small-lamp is detected.
KDC-MP538U/MP6039/MP6539U/
W6041U/W6141UY/W6541U/W6641UY/X592
Operation / Condition / Compatibility
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