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4
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
●
SWITCH UNIT (X16-638x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
Panel
μ
-COM
IC3
Remote Control IC
Remote control receiver
Q1
Triangle Red LED SW
Triangle LED lights when Q1’s base level goes Hi.
Q3
Blue LED SW (Vol left)
Blue LED brightness control (PWM).
Q4
Blue LED SW (FL Top & ATT Key)
Blue LED lights when Q4’s base level goes Hi.
Q5
Blue LED SW (FL under)
Blue LED brightness control (PWM).
Q6
Blue LED SW (Multi function Key)
Blue LED brightness control (PWM).
Q11
VFD Filament Voltage (-)
VFD Cut-off bias (5-7.5V) supply.
●
ELECTRIC UNIT (X34-597x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC11
Audio8V Ref Power Supply
Output 1.27V.
IC21
Regulator
Power supply for IC700. (USB
μ
-com)
IC61
Switching Regulator
Power supply for D5V. (to USB/PANEL)
IC71
Switching Regulator
Power supply for FL+B. (to PANEL)
IC211
Hi-side SW
Detection of USB Over Current
IC301
RDS decoder IC
RDS decoder. (only E type)
IC331
OPAMP
For AGC of the Spectrum Analyzer
IC451
Eelectrical Volume & Source Selecter
Controls the source, volume, and tone.
IC501
Power IC
Ampli
fi
es the front L/R and the rear L/R to 50W maximum.
IC601
System
μ
-com
Controls FM/AM tuner, the changer, CD mechanism, Panel, volume and tone.
IC602
Reset IC
“L” when detection voltage goes below 3.6V or less.
IC603
ROM CORRECTION
For Main program correcting emergency (EEP_ROM)
IC604
Muting logic IC
Controls logic for muting.
IC605
Logic IC
Level Shift (3.3V
→
5V)
IC607
Logic IC
Level Shift (5V
→
3.3V)
IC608
EEP_ROM
Memory of TEL BOOK for “Blue Tooth”
IC700
Sub
μ
-com
USB/CD mechanism control
IC750
iPod Authentication Coprocessor
iPod Authentication
IC751
ROM CORRECTION
For USB program correcting emergency (EEP_ROM)
IC964
OP AMP
+12dB Gain AMP & L.P.F for BT Output
IC965
Switching Regulator
Power supply for BT3.3V. (to BT Module)
Q11
Audio8V AVR
When Q13 & Q12’ go ON, A8V AVR outputs 8.0V.
Q12
Audio8V AVR SW
When Q13’Base goes Hi, Supply current to IC11.
Q13
Audio8V AVR SW
When Q13’Base goes Hi, Q12 & Q11 are ON.
Q21,22
B.U.5V AVR
While BU is applied, BU5V AVR o5V.
Q23,24
PON5V
When Q24’base goes Hi, PON5V o5V.
Q31,32
SERVO+B AVR
When Q33 & Q34’ go ON, AVR outputs 8V.
Q33,34
SERVO+B SW
When Q34’Base goes Hi, Q33 is ON.
Q41,42
IllumB AVR
When Q43 & Q44’ go ON, AVR outputs 10V.
Q43,44
IllumB SW
When Q44’Base goes Hi, Q43 is ON.
Q51,52
SW16V
When Q9 & Q34’ go ON, The voltage appears. (~16V)
Q71,72
FDC+B AVR
When Q43 goes ON, AVR outputs 9V. (FL Filament)
Q81,82
FL+B SW
When Q81’Base goes Hi, FL+B outputs 53V.
COMPONENTS DESCRIPTION