Kenwood KCD-BT6544U/UY Service Manual page 4

KDC-BT6544U/BT6544UY
/BT7043U/BT742U
● ELECTRIC UNIT (X34-629x-xx)
Ref. No. Application / Function
IC10 Audio 8V REF / Power Supply
IC70 Digital AVR for Panel & USB
IC150 Power Control SW
IC200 Power IC
IC240 DSP
IC241 E2P Memory
IC260 Source Selector & E-VOL
IC301 System μ-COM Reset Control
IC302 System μ-COM
IC303 Mute Logic
IC500 RDS & RBDS Decoder
IC600 Bluetooth MIC Buffer
IC601 Bluetooth Module 3.3V AVR
Q10~12 Audio 8V AVR
Q20~23 DSP5V AVR
Q30,31 SW5V
Q32,33 BU5V AVR
Q40~43 Servo AVR
Q50~53 ILLUMI AVR
Q90 BU DET SW
Q92 ACC DET SW
Q93 Surge DET SW
Q110~113 Power Cntrol Output
Q114,115 Power ANT SW
Q130 Small Lamp DET SW
Q170 Level Shift
Q440 Preout Mute SW
Q441 Preout Mute Driver
Q442 Preout Mute SW
Q450 Preout Mute SW
Q451 Preout Mute SW
Q460 Preout Mute SW
Q461 Preout Mute Driver
Q462 Preout Mute SW
Q480,481 AM+B SW
Q520 PAN5V SW
Q601 Bluetooth Module Reset
4
COMPONENTS DESCRIPTION
Outputs 1.27V.
Switching regulator for USB&VBUS and FDC (5V).
USB power control switch with over current detection and protection.
Amplifi es front L/R and rear L/R.
Digital signal processor.
DSP setting memory.
Selects analog source & full source volume. Analog source: AM/FM, CH, AUX.
Digital source is selected by CD mecha. (CD/USB)
Speaker-out "DC-offset" detection and protection. (This function consists of
IC260 and IC200)
Outputs Lo (system μ-COM reset) when detection voltage goes below 3.6V.
System control including power management, panel control, AM/FM/CH/SOC
control, external control and etc.
Controls logic for muting.
MIC signal differential amplifi er.
During active time, POWER is ON.
During active time, POWER is ON.
When the base of Q23 goes Hi, DSP5V AVR is ON.
During active time, POWER is ON.
During active time, POWER is ON.
During active time, POWER is ON.
During active time, POWER is ON.
Detects the backup voltage. If the backup is detected, it is ON.
Detects ACC voltage. If ACC is detected, it is ON.
Detects over-input voltage. If surge is detected, it is ON.
When the base of Q110 goes Hi, power control output is ON. During active time,
audio source is active.
During active time, tuner source is active.
Detects small lamp. If small lamp is detected, it in ON.
Sysytem μ-COM (5V) ↔ Bluetooth module (3.3V)
Non-fader Lch
(Non-fader) When this transistor is ON, mute is active.
Non-fader Rch
Front Lch
Front Rch
Rear Lch
(F/R) When this transistor is ON, mute is active.
Rear Rch
During active time, AM source is active.
When the base goes Lo, PAN5V is ON.
When the base goes Hi, Bluetooth module is reset.
Operation / Condition / Compatibility