Kenwood KDC-BT7539U Service Manual page 5

Ref. No. Application / Function
Q121 B.U Detected SW
Q122 Surge Detect SW
Q123 ACC Detect SW
Q141,144 P-CON SW
Q142,143 P-CON Protect
Q145,146 Power Antenna SW
Q151 Small-lamp Detect SW
Q321,322 AM+B SW
Q331 AGC CONTROL (for SPE. ANA.)
Q401~406 Pre-out mute SW
Q407,408 Pre-out mute driver
Q602,603 LEVEL SHIFT
Q680 Invertor
Q681,682 PANEL +5V SW
Q683,684 LEVEL SHIFT
Q702,703 3.3V_AVR_for_IC700 (fl ash_type)
Q704 Decoder SRAM standby control Buffer
Q705 CD "LOE_LIM" SW_Buffer
Q900 L.P.F
Q901 L.P.F
● 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
COMPONENTS DESCRIPTION
When Q121'base gose Hi, B.U voltage is detected.
When Q122'base goes Hi, Surge voltage is detected.
When Q123'base gose Hi, Acc voltage is detected.
When Q144'base goes Hi, AVR outputs 14V.
Protect Q141 by turning on when P-CON output is grounded.
When Q146'base goes Hi, power antenna switch outputs 14V.
When Q151'base goes Hi, Small-lamp is detected.
When Q322'base gose Hi, AM+B is outputs.
AGC GAIN CONTROL
When a base gose Hi, Pre-out is set to mute.
When a base gose Lo, mute driver is turned on.
System μ-com (5V) to Sub μ-com (3.3V)
When a base gose Hi, BT RESET is ON.
When Q682'base gose Hi, PANEL +5V is outputs.
CD mechanism (3.3V) to Sysytem μ-com (5V)
When base of Q702 is "H", 3.3V_On.
When base of Q704 is "L", SRAM_STBY.
When base of Q705 is "H", Loading_End.
L.P.F for BT Output (Rch)
L.P.F for BT Output (Lch)
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.
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
Operation / Condition / Compatibility
Operation / Condition / Compatibility
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