Components Description; Power Supply Unit (X00-4100-00); Synthesizer Unit (X14-967X-Xx) - Kenwood GX-204KE Service Manual

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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 filament
Q54 Power supply for VFD filament
Q55 Power supply SW for VFD filament
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

SYNTHESIZER UNIT (X14-967x-xx)

Ref. No. Application / Function
IC121 FM diver IC
IC141 RDS demodulation IC
IC143 Amplifier for filters
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L 13942296513
IC171 AM noise canceller IC
IC201 Amplifier for isolation
IC221 Audio control IC
IC251 Audio control IC
IC301 Amplifier for midpoint potential output
IC391 Servo 8V power supply
IC401 Power amplifier IC
IC521 I2C bus IC
IC551 Isolation IC
IC651 D3.3V power supply
IC671 D5V power supply
IC681 C3.3V power supply
IC751 Mute logic IC
System µ-com
IC801
IC802 Reset IC
IC952 Level shift IC
Q101 IF count detection
Q102 AM power supply switch
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Q103 RDS data buffer
Q121 Diver switch
Q122 FM S meter switch
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Q123 Diver IC power supply switch
Q124 Diver IC power supply switch

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 filament voltage (2.9V) and supplies required current.
Configures Darlington with Q53.
ON/OFF filament 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.
Configures Darlington with Q61.
Controls step-up DC/DC switching.
Converts voltage by switching.
Detects output voltage and controls switching timing.
FM diver
Demodulates RDS
RDS noise amplifier
AM noise canceller
6CD isolation
BASS/MID/TRE, MPX, mute, electric volume
WOW control
Outputs midpoint potential (6.8V, 4V).
Servo 8V power supply driver
Power amplifier with 4CH
Sie-BUS communication
AUX isolation
Power supply driver for 6CD mechanism Bu3.3V.
Power supply driver for 6CD/MD mechanism DSP5V.
Power supply driver for 6CD mechanism DSP3.3V.
For hardware mute.
System control
Detects system reset.
Level-shifting (3.3V → 5V)
Outputs Lo when IF count is detected.
Outputs 8V when AM.
Outputs RDS buffer
Detects diver ON/OFF.
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Outputs S meter voltage when FM.
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Outputs Hi when AM_OFF.
Outputs Lo when AM.
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Operation / Condition / Compatibility
Operation / Condition / Compatibility
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GX204KEF2/KHF2/LEF2
GX204REF2/SEF2
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