Kenwood KDC 3031 GY Service Manual

Page 4

KDC-SOSI A/3031 AY/3031 (3/3031 GY
KDC-309A/309G/F331A/F331 G

COMPONENTS DESCRIPTION

0 SWITCH UNIT (X16-2932-7x)

Ref. No. Application / Function Operation / Condition
|C1 VFD DRIVER
|C3 REMOTE SENSOR
Q1 GREEN LED SW ON" when the base goes "H.
02 RED LED SW ON" when the base goes "H.
Q21 PAN SW5V ON" when the base goes "H.

MICROCOMPUTERS TERMINAL DESCRIPTION

0 SYSTEM p-COM : IC1 on X34- (ELECTRIC UNIT)

Active

Pin No. (H/L) Pin Name l/O Application Processing Operation

1 DC ERR | DC offset detection input

2 LINE MUTE | Phone detection NAVI MUTE : Over 2.5V, TEL MUTE : Below 1V

3 ROTARY CW | Rotary encoder input

4 AVSS -

5 TUN TYPE1 | E-VOL setting switch Refer to TUN TYPE" on the TRUTH TABLE

6 TUN TYPE2 | E-VOL setting switch Refer to TUN TYPE" on the TRUTH TABLE

7 AVREFt -

8 VFD DATAF | Data input from VFD driver

9 VFD DATA5 0 Data output to VFD driver

10 VFD CLK O Clock output to VFD driver

11 L VFD RST 0 Reset output to VFD driver Display OPE Key reset, TDF panel OFF 2 L
Display ON, Key scan : H

12 VFD CE 0 Chip enable output to VFD driver

13 ROTARY CCW | Rotary encoder input

14 L TDF DET | TDF panel detection TDF panel OFF : H, TDF panel ON : L

15 PWIC BEEP O Beep output

16~18 NC -

19 RDS AFSL 0 Tuner RDS mute output Refer to RDS AFSL" on the TRUTH TABLE
Ad]ustment=H, PS1-1,2=L, PS1-3=Hi-Z,

20 L TUN ADJ | For adjusting |C1D PSZ-1,2=Hi-Z, TUN DATA, CLK=Hi-Z

21 TUN SD | Tuner search stop output H : Station exists, L : Station does not exist

22~24 NC -

25 AUD SDA I/O Volume + tuner I2C data input and output

26 AUD SCL I/O Volume + tuner I2C clock input and output

27 PWIC STBY 0 Power IC standby output Power IC ON :H, Power IC OFF : L

28 VOL MUTE O E-VOL mute output L : Mute OFF, Hi-Z : Mute ON

29 PWIC MUTE 0 Power IC mute output Power OFF :L, Standby :L, Tel mute : L

30 TUN FANC OUT 0 Tuner block (inside the p-com) check OK : L, NG : H