Kenwood KAC-PS621 Service Manual page 5

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
18 SCL_AMP I/O
19 AUDIO_SCL I/O
20 AUDIO_SDA I/O
21 AUDIO_MUTE O
22 E2P_SCL I/O
23 E2P_SDA I/O
24 NC O
25~28 DIP-SW1~DIP-SW4 I
29 MODEL1 I
30 MODEL2 I
31,32 NC O
33 VSS1 -
34~37 NC O
38 LCD-ILL O
39 WHITE-LED O
40 NC O
41~43 ATT1~ATT3 O
44,45 NC O
46 COMM-SW O
47~50 NC O
51 D-PWER O
52 DC-DET I
53 NC O
54 POWER-ON O
55 5VSW O
56 MUTE1 O
57 MUTE2 O
58 FAN1 O
59 FAN2 O
60 RESET -
61 PCON I
62 LX_CON I
63 LX_REQ_M I
64 NC O
65 V_DOWN I
66 NC O
67 VSS0 -
68 VD1 -
69 X2 -
70 X1 -
Function
CLK input/output AMP communication
CLK input/output with audio chip
Data input/output with audio chip
Mute output to audio chip
CLK input/output with E2PROM
Data input/output with E2PROM
Not used
AMP address setting
Model setting 1
Model setting 2
Not used
GND
Not used
LCD backlight switch
Triangle illumination switch
Not used
Output attenuate due to rise in temperature 1~3
Not used
Communication IC power switch
Not used
D class amplifier power supply control
Speaker output DC voltage detection
Not used
Amplifier power supply control
5VSW
Amplifier section input stage mute control
Driver stage pop-noise mute control
Fan rotation control
Fan speed control
Hard reset
Amplifier power control
LX-BUS communication control
Data receive request from H/U
Not used
Momentary power down detection
Not used
GND
VDD
Main clock input 1
Main clock input 2
KAC-PS621/X621
Processing Operation Description
H : Mute OFF, L : Mute ON
H : ON, L : OFF
H : ON, L : OFF
H : Attenuate, L : Not attenuate
H : ON, L : OFF
H : ON, L : OFF (2ch/4ch L fixed)
H : Normal, L : Abnormal
H : ON (D/AB class), L : OFF
H : OFF, L : ON
H : OFF, L : ON
H : OFF, L : ON
H : Operate, L : Stop
H : Low speed, L : High speed
H : Normal, L : Reset
H : OFF, L : ON
H : OFF, L : ON
H : ON, L : OFF
H : ON (Power down detection), L : OFF (L fixed)
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