Kenwood xxv-03a Service Manual page 5

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MICROCOMPUTER'S TERMINAL DESCRIPTION
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Pin No. Pin Name
18 SCL_AMP
19 AUDIO_SCL
20 AUDIO_SDA
21 AUDIO_MUTE
22 E2P_SCL
23 E2P_SDA
24 NC
25~28 DIP-SW1~DIP-SW4
29 MODEL1
30 MODEL2
31,32 NC
33 VSS1
34~37 NC
38 LCD-ILL
39 WHITE-LED
40 NC
41~43 ATT1~ATT3
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44,45 NC
L 13942296513
46 COMM-SW
47~50 NC
51 D-PWER
52 DC-DET
53 NC
54 POWER-ON
55 5VSW
56 MUTE1
57 MUTE2
58 FAN1
59 FAN2
60 RESET
61 PCON
62 LX_CON
63 LX_REQ_M
64 NC
65 V_DOWN
66 NC
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67 VSS0
68 VD1
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69 X2
70 X1
I/O Function
I/O CLK input/output AMP communication
I/O CLK input/output with audio chip
I/O Data input/output with audio chip
O Mute output to audio chip
I/O CLK input/output with E2PROM
I/O Data input/output with E2PROM
O Not used
I AMP address setting
I Model setting 1
I Model setting 2
O Not used
- GND
O Not used
O LCD backlight switch
O Triangle illumination switch
O Not used
O Output attenuate due to rise in temperature 1~3
O Not used
O Communication IC power switch
O Not used
O D class amplifier power supply control
I Speaker output DC voltage detection
O Not used
O Amplifier power supply control
O 5VSW
O Amplifier section input stage mute control
O Driver stage pop-noise mute control
O Fan rotation control
O Fan speed control
- Hard reset
I Amplifier power control
I LX-BUS communication control
I Data receive request from H/U
O Not used
I Momentary power down detection
O Not used
- GND
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- VDD
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- Main clock input 1
- Main clock input 2
2 9
8
Processing Operation Description
H : Mute OFF, L : Mute ON
H : ON, L : OFF
H : ON, L : OFF
H : Attenuate, L : Not attenuate
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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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