Components Description - Kenwood FZDA07ELEF2 Service Manual

● POWER SUPPLY UNIT (X00-4100-00)
Ref. No. Application / Function
Q31 Power supply for illumination LED
Q41 Power supply for IGN5V
Q51 Step-down DC/DC switching
Q53 Power supply for VFD fi lament
Q54 Power supply for VFD fi lament
Q55 Power supply SW for VFD fi lament
Q61 Power supply for DC/DC converter
Q62 Power supply for DC/DC converter
Q71 Step-up DC/DC timing control
Q72 Step-up DC/DC switching
Q73 Step-up DC/DC output voltage switching
● TUNER UNIT (X05-6150-62)
Ref. No. Application / Function
Q1,2 TILT Power supply SW
● SYNTHESIZER UNIT (X14-987x-xx)
Ref. No. Application / Function
IC1 Bu3.3V power supply IC
IC2 Analog 5V power supply IC for CODEC
IC3 3.3V power supply IC for CODEC
IC4 8V power supply IC for radio
IC5 8V power supply IC for audio
IC6 1.25V power supply IC for DSP
IC7 3.3V power supply IC for DSP
IC10 RDS demodulation IC
IC11 FM diversity IC
IC31 4-input audio switch
IC32 Midpoint potential output amplifi er for audio
IC34 Audio control IC
IC35 Adding circuit for NAVI audio signal
IC36 Power amplifi er IC
IC37 DAC output ODD circuit (For front channel)
IC38 DAC output Low Pass Filter (For rear channel)
IC39 DAC output Low Pass Filter (For center/SW)
IC40 For SUBW audio signal balance transfer
IC52 DSP
IC55 CODEC
IC62 µ-com IC for audio
IC63 Reset IC

COMPONENTS DESCRIPTION

Stabilizes illumination LED voltage (8.1V) and supplies required current.
Stabilizes IGN5V voltage (5.1V) and supplies required current.
Converts voltage by switching.
Stabilizes VFD fi lament voltage (2.9V) and supplies required current.
Confi gures Darlington with Q53.
ON/OFF fi lament power supply by µ-com FL_FIL_ON signal.
(ON with µ-com L output)
Stabilizes DC/DC input voltage (9.5V) and supplies required current.
Confi gures Darlington with Q61.
Controls step-up DC/DC switching.
Converts voltage by switching.
Detects output voltage and controls switching timing.
ON/OFF of TILT power supply
Input: BU 8V, Output when +B on
Input: +B, Output when A_PON is H
Input: Analog 5V for CODEC, Output when A_PON is H
Input: +B, Output when A_PON is H
Input: +B, Output when A_PON is H
Input: N_D 3.3V, Output when N_D 3.3V is being applied
Input: N_D 5V, Output when N_D 5V is being applied
Demodulation of RDS signal
Radio antenna MAIN/SUB switching
Switching between FM, AM and Analog TV
Midpoint potential (8V and 3.3V) output for sound quality
Selector, BASS/MID/TRE, Mute, Electric volume
Mix NAVI audio signal in the front L/R ch
4-channel BTL amplifi er integrated power IC (Gain=26dB)
Convert CODEC balance output to the single end output (Second order LPF)
Second order LPF
Second order LPF
SUBW signal single end input → Balance output conversion
Acoustic fi eld control
Combination IC for DIR, ADC (2ch), and DAC (8ch)
System control of audio board
System reset detection (2.9V)
FZDA07ELEF2/EREF2/MRHF2
Operation / Condition / Compatibility
Operation / Condition / Compatibility
Operation / Condition / Compatibility
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