Kenwood KDC 2027 SA Service Manual

Page 5

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY
KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

MICROCOMPUTERS TERMINAL DESCRIPTION

0 SYSTEM MICROCOMPUTER : UPD780058GC55X (X34 : IC1)

Pin No. Name l/O Description Processing Operation
1 PANEL l Panel detection H : Panel detached, L : Panel attached
H : Eject is completed
2 BEJE SW
Except 8cm CD model :Always output L
3 NC 0 Not used (out put L)
4 Avss
H :Panel detached, L : RESET
5 L-RST 0 LCD driver RESET Normal H, Power off L
When 7seg model, output L
H :Select (panel communication)
6 L-CE 0 LCD driver selection
When panel attached, output L
7 AVREF1
8 NC Not used (connected to Spin)
9 lC10-DATA l/O lCtO, E2PROM data communication Non communication : H
10 lC10-CLK O lC10, E2PROM clock communication Non communication : H
Non communication : H
11 L-DATAL | Data input lrom the LCD driver When panel detached : L
Pull down on X34 unit, Pull up on X16 unit
12 L-DATAS 0 Data output to the LCD driver When panel detached, output L
13 L-CLK O Clock output to the LCD driver When panel detached, output L
14 R-DATA | Data input from the RDS Except RDS model :Output L
15 R-QUAL | Quality input from the RDS Except RDS model :Output L
16 CH-DATAC | Data input from the changer (new 5L) Except changer model : Output L
When non communication, last data keeping
17 CH-DATAH 0 Data output to the changer (new 5L)
Except changer model : Output L
Check the old and new
18 CH-CLK l/O Clock input/output with the Changer (new 5L)
Except changer model : Output L
L : Requset
19 CH-REQH 0 Request output to the changer (new 5L)
Except changer model : Output L
20 NC 0 Not used (output L)
H : Normal, L : FM/AM seek and AF search
21 AFS 0 Noise detection time constant switching terminal
(When tuner SRC auto zero, L)
22~24 NC 0 Not used (output L)
H : Changer on, L : Changer off
25 CH-CONT O Changer control
Except changer model : Output L
26 TYPE REF O 5V lines output for destination setting H : During destination reading
27 SD | Tuner SD input H : Station detected
28 NC 0 Not used (output L)
29 TYPE2 | Destination type selection terminal 2 Refer to destination type list.
30 TYPE1 | Destination type selection terminal 1 Refer to destination type list.