Kenwood GX-201KHF2 Service Manual

Contents

3GX-201KHF2/LHF2/RHF2/SHF2● SYNTHESIZER UNIT (X14-694x-xx)Ref. No. Application / Function Operation / Condition / CompatibilityIC11 FM diversity IC FM diversity switching (Only for GX-201JHF2/KHF2)IC12 AM noise canceller IC AM noise cancellerIC13 2-piece ope-amp RDS noise amp (Only for GX-201LHF2/RHF2)IC14 RDS demodulation IC RDS demodulation (Only for GX-201LHF2/RHF2)IC22 Electronic volume BASS/MID/TRE, MPX, Mute, Electronic volumeIC23 Ope-amp with switch Audio/NAVI switchingIC31~34 4-piece ope-amp FIX-EQIC35 2-piece ope-amp 1/2 VCC outputIC41 Power amp 4ch power ampIC81 System μ-com System controlIC82 Reset IC System reset detectionIC83 I2C BUS IC F-BUS communicationIC84 2-piece NOR circuit For hard mutingIC85 EEPROM Bug counter-measureIC86,87 Inverter circuit F-BUS controlQ101 Diversity switch When turned ON, turns diversity OFF (Only for GX-201JHF2/KHF2)Q102,103 FM power supply switch When FM, 8V outputQ104,105 AM power supply switch When AM, 8V outputQ106 IF count detection When detecting IF count, Lo outputQ107 RDS data buffer RDS data buffer output (Only for GX-201LHF2/RHF2)Q108 S-meter buffer S-meter voltage outputQ151,152 Noise amp Noise detection constant switching (Only for GX-201LHF2/RHF2)Q153 Noise amp Noise detection output buffer (Only for GX-201LHF2/RHF2)Q202 Mute switch For muting with in electronic volumeQ401,402 NAVI mute For NAVI muting at interruptionQ403 SVR switch For SVR dischargingQ404 SVR switch For SVR discharging at over voltageQ601,602 Audio DC/DC power supply switch For DC/DC audioQ604,605 Heater DC/DC power supply switch For DC/DC heaterQ606,607 DC/DC control switch For switching internal frequencyQ650 Audio DC/DC power supply switch For DC/DC audioQ651 Heater DC/DC power supply switch For DC/DC heaterQ801 Buzzer switch For buzzerQ802 Illumination + detection For illumination + detectionQ803 Reset output switch for F-BUS When resetting F-BUS, Hi outputQ804 NAVI mute switch When muting NAVI, Hi outputQ805 IF count detection When detecting IF count, Lo outputQ806 P-ANT circuit control switch When tuner, GND electric potential outputQ807 ACC detection When ACC ON detection, Lo outputQ808 IGN detection When IGN ON detection, Lo outputQ809 SYS_ON current buffer When SYS_ON Hi, Lo outputQ810 Hard reset switch When HARD_RESET ON, Lo outputQ812 BUS_OFF switch When F-BUS system OFF, Hi outputCOMPONENTS DESCRIPTION