Switch Unit (X25-929X-Xx); Daughter Unit (X89-2540-01) - Kenwood GX-201KHF2 Service Manual

Cd & heater control receiver
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GX-201KHF2/LHF2/RHF2/SHF2
Ref. No.
Q813
P-ON5V power supply switch
Q815
BU detection
Q816
P-ANT circuit control switch
Q817,818
P-ANT circuit protection
Q820
F-BUS mute output
Q821
BUS_ON detection
Q822
BUS_ON switch
Q850,852
Illumination - detection switch
Q853
Illumination - detection switch

SWITCH UNIT (X25-929x-xx)

Ref. No.
Display control µ-com
IC1
IC3
EEPROM
Q1
Audio VFD5V switch
Q2
Audio VFD5V switch
Q4
Heater VFD5V switch
Q5
Heater VFD5V switch
Q11
F differential indicator power supply switch
Q12
R differential indicator power supply switch
Q21
Multiple-push reset circuit detection
Q22
Multiple-push reset circuit detection
Q23
Multiple-push reset circuit detection
Q24
Heater UART communication control
Q25
Heater UART communication control
Q26
SW5V power supply switch
Q27
Panel illumination switch
Q28
Panel illumination switch
Q29
F differential indicator dimmer control
Q30
R differential indicator dimmer control
Q33
System reset detection
Q34
Dimmer current counter-measure
Q35
System reset detection
Q36,37
6CD breakup counter-measure

DAUGHTER UNIT (X89-2540-01)

Ref. No.
IC11
Various constant voltage power supply output
IC31
CD servo 8V power supply
Q101
Panel illumination power supply switch
Q301~303
CD servo power supply switch
4
COMPONENTS DESCRIPTION
Application / Function
Application / Function
Application / Function
Operation / Condition / Compatibility
For P-ON5V
When BU ON, Lo output
When tuner, BU electric potential output
P-ANT short circuit protection
When mute ON, Hi output
When F-BUS system ON, Hi input
When F-BUS system ON, Hi output
When detecting illumination -, Hi output
When detecting illumination -, Lo output
Operation / Condition / Compatibility
VFD control, Key intake
For bug counter-measures
When audio VFD ON, 5V output
When audio DC/DC ON, Lo output
When heater VFD ON, 5V output
When heater DC/DC ON, Lo output
When F-differential indicator ON, 5V output
When R-differential indicator ON, 5V output
When detecting REP/RDM, DWN_SEEK, Hi output
When resetting by multiple push, Lo output
When TONE (BAL/FAD) detected, Lo output
Heater UART communication control (TX)
Heater UART communication control (RX)
When IGN ON, 5V output
When panel illumination ON, 10V output
When panel illumination ON, GND electrical potential
When dimmer OFF, GND electrical potential
When dimmer OFF, GND electrical potential
When system is reset, Hi output
When audio encoder ON, 5V output
When system is reset, Lo output
FL (H) discharge circuit
Operation / Condition / Compatibility
5V, 8V, 10V constant voltage power supply
For CD servo
When illumination + input, 5V output
For CD servo

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