Stereo Input; Led Power - Kenwood RX-28 Service Manual

RX-28
CIRCUIT DESCRIPTION
Name Description Processing
BUSY Serial "BUSY"
DATA Serial "DATA"
UNUSED GND
sc Communication clock output PU (+5V)
so Communication data output PU (+5V)
Sl Communmication data input PU (+5V)
S__REQ Slave communication request PD (GND)
S__RDY Slave communication authorization PD (GND)
M-REQ Master communicatioin request PD (GND)
PROTECT Protection input PD (GND)
TUNER MUTE Tuner mute PD (GND)
PLL_ST PLL strobe PD (GND)
PLL_CK PLL clock PD (GND)
PLL_DT PLL data PD (GND)
IF_IN IF count input terminal , PD (GND)
SD SD input PD (GND)
STEREO STEREO input PD (GND)
UNUSED PD (GND)
POWER LED POWER
UNUSED Cc
—|-|-|-|ololojoj—jo/—-|—|-jo;0
O10
BACKUP Backup input
REMOCON Remote controller input
a Key return 0
Key return 2
Key return 3
Key return 4
Key return 5
Key return 6
KR4
KR5
KR6
UNUSED
| vss | GND
XTAL aif Oscillator terminal (4.19 MHz XTAL)
UNUSED
EXTAL Oscillator terminal (4.19 MHz XTAL)
VREF Voltage detect reference voltage terminal (unused)
VFDP FL load power supply terminal (— 30V)
| RKSO eee section key scan 0
| RKS1 Receiver section key scan 1
| RKS2 Receiver section key scan 2
RKS3 Receiver section key scan 3
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