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KRC-33R,378R/RY,480R
CIRCUIT DESCRIPTION
(X14-) IC1 :
PORT No. 41 42-44 45 46 47
-COM
I/O O O O O O O I O O O O O I I I I I I I I I I I I I I FUNCTION Noise detection time constant switch. Mute signal output to the power IC (IC4). SVR signal output to the power IC (IC4). Stand-by signal output to the power IC (IC4). Control signal output to P-CON or P-ANT. Buzzer signal output. ACC detection signal input. Back-up voltage detection signal input. Request signal output to the changer. Changer control. SW 5V power control signal output. P.ON power supply control signal output. System reset signal input. Data input from the remote controller. Data clock input from RDS decoder . Request input signal from the changer. Insertion detection signal input from cassette mechanism. Key request. Tape-end detection signal input from cassette mechanis. GND. Power supply. For main system clock oscillation. For main system clock oscillation. For flash memory writing. Power supply. Power supply. 5V power supply (For A/D converter reference voltage). S-meter voltage input from the front-end. Tape mode input from cassette mechanism. Phone (Tel-mute) voltage input. Voltage input from E-volume (IC2)�s noise amplifier. Destination switching.
OPERATING CONDITION
PORT NAME AFC N.C. P-MUTE
SVR
"L" : FM seeking. "H" : The other condition. "L" : Power IC (IC4) mute. "L" when P.ON goes down. "H" : Power IC (IC4) "ON". "L" : Power IC (IC4) "OFF". "H" : P-CON signal output "ON". "L" : P-CON signal output "OFF". Beep sound output. "H" : ACC "OFF". "L" : ACC "ON". "H" when back-up signal does not exist. "L" when back-up signal exists. "L" : Request. "H" : Changer mode. "L" : The other mode. "L" : SW 5V "ON". "H" : Power "ON". "L" : Reset. "H" : Pack in. Active "L". "H" : Tape running. "H" : SD signal exists. "L" : SD signal does not exist. Vth : Fit the new front-end. Vth : 2.5V. Tel mute : More than 1V. Navi mute : Less than 2.5V. "H" : KRC-478RV/RYV. "L" : The other models. "L" : Tape-end. "L" : Pack out. "H" : The other condition. "L" : Power "OFF".
STBY P-CON N.C. BEEP ACC-DET BU-DET CH-REQ H CH-CON N.C. SW5 P.ON RESET REMOTE R-CLK CH-REQ C PACK IN KEY-REQ T-END VSS 0 VDD 1 X2 X1 IC/TEST XT2 VDD 0 VDD 0 AV REF 0 S-METER T-MODE PHONE NOISE TYPE 0
48 49 50 51 52 53 54 55 56 57 58,59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
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