Kenwood KRF-X7775D - Page 8

KRF-X7775D/X7775D-S/VR-5080/5090
8
CIRCUIT DESCRIPTION
Port No. Port Name I/O Function
1 REM DA O IR transmitter IC(X13,IC5) control data output.
2 REM CK O IR transmitter IC(X13,IC5) control clock output.
3 FL CLK O Clock output to FL driver.
4 FL DIN I Data input from FL driver.
5 FL DOUT O Data output to FL driver.
6 FL STB O Strobe output to FL driver.
7 FL RST O Reset output to FL driver.
8 ENC B I Input port of volume encoder.
9 VDD - +5V power supply.
10 ENC A I Input port of volume encoder.
11 SEL CLK O Clock output to selector IC.
12 SEL DATA O Data output to selector IC.
13~15 SEL STB1~3 O Strobe (1~3) output to selector IC.
16 TONE CLK O Clock output to tone control / selector IC.
17 TONE DATA O Data output to tone control / selector IC.
18 TONE STB O Strobe output to tone control IC.
19 VOL CLK O Clock output to volume IC.
20 VOL DATA O Data output to volume IC.
21 VOL STB2 O Strobe 2 output to volume IC.
22 TEST/VPP - Connected to GND.
23 STEREO I Tuner stereo signal detection port.
24 SD I Tuner SD signal detection port.
Clock output to PLL (LC72131) IC.
25 RF PLL CLK O ✽ Clock output to PLL IC (LV2105V) for RF remote controller.
✽ Except KRF-X7775D/9995D
Data output to PLL(LC72131) IC.
26 RF PLL DATA O ✽ Data output to PLL IC (LV2105V) for RF remote controller.
✽ Except KRF-X7775D/9995D
27 PLL DO I Data input from PLL (LC72131)IC.
28 PLL CE O Chip enable to PLL (LC72131) IC.
29 T MUTE O Mute control to tuner.
30 RF PLL CE O PLL (LV2105V)CE for RF remote controller. (VR series only)
31~33 P MACRO A~C O Output port for perfect macro (A~C). ( Refer to 7-6)
34 TV SENS I Detection port of TV signal. ( Refer to 7-7)
35 VOL STB1 O Strobe 1 output to volume IC.
36 S DATA I/O SL16 data input/output.
37 VDD - +5V power supply
38 X2 - Crystal resonator (12.5MHz) connection.
39 X1 - Crystal resonator (12.5MHz) connection.
40 VSS - Connected to GND.
41 XT2 - Unused.
42 XT1 - Unused.
43 RESET I Reset signal input for main microcomputer.
44 CE I Detection port of chip enable.
45 S BUSY I/O Busy signal input/output.
46 232C DET I Detection port of RS232C communication. (Except KRF-X7775D)
47 RDS CLK I Clock input of RDS demodulator IC. (E/T type only)
48 POWER KEY IN I Detection port for power key.
49 REM1 I Remote control signal input 1 (front panel).
50 REM2 I
Remote control signal input 2 (IR receiver).
Except KRF-X7775D (X/M/V)and KRF-X9995D (M/X)
6-2 Port Description of Main Microcomputer : uPD784217A516 (X13, IC3)