Components Description; Rom Correction - Kenwood KDC-BT7539U Service Manual

KDC-BT7539U/BT8041U
/BT8141UY/BT838U
● SWITCH UNIT (X16-638x-xx)
Ref. No. Application / Function
IC1 Panel μ-COM
IC3 Remote Control IC
Q1 Triangle Red LED SW
Q3 Blue LED SW (Vol left)
Q4 Blue LED SW (FL Top & ATT Key)
Q5 Blue LED SW (FL under)
Q6 Blue LED SW (Multi function Key)
Q11 VFD Filament Voltage (-)
● ELECTRIC UNIT (X34-597x-xx)
Ref. No. Application / Function
IC11 Audio8V Ref Power Supply
IC21 Regulator
IC61 Switching Regulator
IC71 Switching Regulator
IC211 Hi-side SW
IC301 RDS decoder IC
IC331 OPAMP
IC451 Eelectrical Volume & Source Selecter
IC501 Power IC
IC601 System μ-com
IC602 Reset IC
IC603

ROM CORRECTION

IC604 Muting logic IC
IC605 Logic IC
IC607 Logic IC
IC608 EEP_ROM
IC700 Sub μ-com
IC750 iPod Authentication Coprocessor
IC751 ROM CORRECTION
IC964 OP AMP
IC965 Switching Regulator
Q11 Audio8V AVR
Q12 Audio8V AVR SW
Q13 Audio8V AVR SW
Q21,22 B.U.5V AVR
Q23,24 PON5V
Q31,32 SERVO+B AVR
Q33,34 SERVO+B SW
Q41,42 Illumination+B AVR
Q43,44 Illumination+B SW
Q51,52 SW16V
Q71,72 FDC+B AVR
Q81,82 FL+B SW
4

COMPONENTS DESCRIPTION

Remote control receiver
Triangle LED lights when Q1's base level goes Hi.
Blue LED brightness control (PWM).
Blue LED lights when Q4's base level goes Hi.
Blue LED brightness control (PWM).
Blue LED brightness control (PWM).
VFD Cut-off bias (5-7.5V) supply.
Output 1.27V.
Power supply for IC700. (USB μ-com)
Power supply for D5V. (to USB/PANEL)
Power supply for FL+B. (to PANEL)
Detection of USB Over Current
RDS decoder. (only E type)
For AGC of the 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.
"L" when detection voltage goes below 3.6V or less.
For Main program correcting emergency (EEP_ROM)
Controls logic for muting.
Level Shift (3.3V→5V)
Level Shift (5V→3.3V)
Memory of TEL BOOK for "Blue Tooth"
USB/CD mechanism control
iPod Authentication
For USB program correcting emergency (EEP_ROM)
+12dB Gain AMP & L.P.F for BT Output
Power supply for BT3.3V. (to BT Module)
When Q13 & Q12' go ON, A8V AVR outputs 8.0V.
When Q13'Base goes Hi, Supply current to IC11.
When Q13'Base goes Hi, Q12 & Q11 are ON.
While BU is applied, BU5V AVR outputs +5V.
When Q24'base goes Hi, PON5V outputs +5V.
When Q33 & Q34' go ON, AVR outputs 8V.
When Q34'Base goes Hi, Q33 is ON.
When Q43 & Q44' go ON, AVR outputs 10V.
When Q44'Base goes Hi, Q43 is ON.
When Q9 & Q34' go ON, The voltage appears. (~16V)
When Q43 goes ON, AVR outputs 9V. (FL Filament)
When Q81'Base goes Hi, FL+B outputs 53V.
Operation / Condition / Compatibility
Operation / Condition / Compatibility