Kenwood KDC-MP538U Service Manual page 4

KDC-MP538U/MP6039/MP6539U/
W6041U/W6141UY/W6541U/W6641UY/X592
Ref. No. Application / Function
Q321,322 AM+B SW
Q331 AGC
Q401~406 Pre-out Mute SW
Q407,408 Pre-out Mute Driver
Q601 CD SRAM STB SW
Q602,603 Level Shift
Q681,682 PANEL+5V SW
Q683,684 Level Shift
Q702,703 3.3V AVR for IC700 (Flash ROM type)
Q704 SRAM Standby Control Buffer
Q705 CD LOE LIM SW Buffer
● SWITCH UNIT (X16-63xx-xx)
Ref. No. Application / Function
IC1 Panel μ-COM
IC3 Remote Control IC
Q1 Triangle Red LED SW
Q3 Blue LED SW (left of VOL)
Q4 Blue LED SW (Top on FL & ATT Key)
Q5 Blue LED SW (Under FL)
Q6 Blue LED SW (Multi Key)
Q11 VFD Filament Voltage (-)
Q21 Blue LED SW
Q22 Red LED SW
Q23 Green LED SW
● CD PLAYER UNIT (X32-6130-00)
Ref. No. Application / Function
IC3 4ch BTL Driver
IC4 Servo DSP with built-in Audio DAC
IC5 D1.5V REG.
IC6 D3.3V REG.
IC11 BU1.5V REG.
Q1 APC (Auto Power Control)
Q13 Inverter
D2 Laser Diode Protection
D3,4 Static Electricity Countermeasure
4
COMPONENTS DESCRIPTION
When Q322's base goes Hi, AM+B is output.
For spectrum analyzer.
When a base goes Hi, pre-out is set to mute.
When a base goes Lo, mute driver is turned on.
When the base goes Lo, SRAM is standby.
From system μ-COM (5V) to USB μ-COM (3.3V).
When Q682's base goes Hi, PANEL+5V is output.
From CD mechanism (3.3V) to system μ-COM (5V).
When Q702's base is Hi, 3.3V is ON.
When the base is Lo, SRAM is standby.
When the base is Hi, loading ends.
Controls panel.
Receives remote control signal.
Triangle LED lights when the base goes Hi.
Blue LED brightness control (PWM).
Blue LED lights when the base goes Hi.
Blue LED brightness control (PWM).
Blue LED brightness control (PWM).
VFD cut-off bias supply (5.0V - 7.5V).
Blue LED brightness control (PWM).
Red LED brightness control (PWM).
Green LED brightness control (PWM).
Driver for focusing & tracking coil, driver for sled & spindle motor, and operation for disc
loading & ejection.
With built-in MP3/WMA/AAC decoder and 1M-bit-SRAM.
Power supply for digital 1.5V.
Power supply for digital 3.3V.
Power supply for back-up 1.5V.
Drives LD (Laser Diode).
Inverts ZDET signal.
Prevents reverse bias which is applied to laser. Laser destruction prevention.
Prevents malfunction by static electricity.
Operation / Condition / Compatibility
Operation / Condition / Compatibility
Operation / Condition / Compatibility