Microcomputer's Terminal Description; System Μ-Com : Ic1 On X34- (Electric Unit) - Kenwood KDC-1028 Service Manual

KDC-1028/128/128CR
KDC-129/129S/229
SWITCH UNIT (X16-2940-xx)
Ref. No. Application / Function
IC1 VFD DRIVER
IC3 REMOTE SENSOR
Q1 GREEN LED SW
Q2 RED LED SW
Q21 PAN SW5V
DAUGHTER UNIT (X89-2690-10)
Ref. No. Application / Function
Q221,222 2-PREOUT MUTE
Q225 2-PREOUT MUTE

MICROCOMPUTER'S TERMINAL DESCRIPTION

SYSTEM µ-COM : IC1 on X34- (ELECTRIC UNIT)
Active
Pin No. Pin Name
(H/L)
1 DC ERR
2 LINE MUTE
3 ROTARY CW
4 AVSS
5 TUN TYPE1
6 TUN TYPE2
7 AVREF1
8 VFD DATAF
9 VFD DATAS
10 VFD CLK
11 L VFD RST
12 VFD CE
13 ROTARY CCW
14 L TDF DET
15 PWIC BEEP
16~19 NC
20 L TUN ADJ
21 TUN SD
22~24 NC
25 AUD SDA
4
COMPONENTS DESCRIPTION
"ON" when the base goes "H".
"ON" when the base goes "H".
"ON" when the base goes "H".
"ON" when the base goes "H".
"ON" when the base goes "H".
I/O Application
I DC offset detection input
I Phone detection
I Rotary encoder input
-
I E-VOL setting switch
I E-VOL setting switch
-
I Data input from VFD driver
O Data output to VFD driver
O Clock output to VFD driver
O Reset output to VFD driver
O Chip enable output to VFD driver
I Rotary encoder input
I TDF panel detection
O Beep output
-
I For adjusting IC10
I Tuner search stop output
-
I/O Volume + tuner I2C data input and output
Operation / Condition
Operation / Condition
Processing Operation
NAVI MUTE : Over 2.5V, TEL MUTE : Below 1V
Refer to "TUN TYPE" on the TRUTH TABLE
Refer to "TUN TYPE" on the TRUTH TABLE
Display OFF, Key reset, TDF panel OFF : L
Display ON, Key scan : H
TDF panel OFF : H, TDF panel ON : L
Adjustment=H, PS1-1,2=L, PS1-3=Hi-Z,
PS2-1,2=Hi-Z, TUN DATA, CLK=Hi-Z
H : Station exists, L : Station does not exist