Kenwood KDC-348U Service Manual page 7

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
41 ZDET IN I
42 CD RST O
43 CD CCE O
44 CD DRIVE MUTE O
45 CD MOTOR O
46 NC -
47 DVCC3 -
48 DVSS -
49,50 NC -
51 SD CD I
52 SD PWR I/O SD block power supply control
53 BT RST O
53 SD CS O
54~56 NC -
57 PS1-1 O
58 PS1-2 O
59 PS1-3 O
60 PS2-1 O
61 NC -
62 FSEL1 O
63 NC -
64 PON SW-REG O
65 BT SYS DATA O
65 SD DO O
66 BT BT DATA I
66 SD DI I
67 SD CLK O
68~70 NC -
71 ILLUMI DET I
72 BU DET I
73 ACC DET I
74 NC -
75 PON 4V-PRE I/O 4V-PRE power supply control (eXcelon model)
76 SA RST O
77 SA CLK O
78 MUTE 0 O
79 MUTE 1 O
80 MUTE 2 O
Application
0-bit mute request
CD mechanism reset
CD mechanism chip enable
CD motor driver mute output
CD motor switching control
Not used
Power supply
GND
Not used
SD card insert detection
BT module reset
CS output to SD
Not used
Power supply IC control
Power supply IC control
Power supply IC control
Power supply IC control
Not used
SW-REG frequency switching
SW-REG frequency switching
SW-REG ON/OFF
Data output to BT
Data output to SD
Data input from BT
Data input from SD
Clock output to SD
Not used
Dimmer illumination detection
Momentary power-down detection
ACC detection
Not used
Reset output for spectrum analyzer
Clock output for spectrum analyzer
Front direct mute
Rear direct mute
Other direct mute
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Truth Value
Processing / Operation / Description
Table
H: Mute request, L: Normal play
H: Normal, L: Reset
q Refer to the truth value table
Output L fi xed
Output L fi xed
L: SD found
L: POWER ON, Hi-Z: POWER OFF
L: BT reset, H: Normal
Output L fi xed
w Refer to the truth value table
w Refer to the truth value table
w Refer to the truth value table
w Refer to the truth value table
Output L fi xed
Output L fi xed
L: OFF, H: ON
Output L fi xed
L: ON, H: OFF
BU found: L,
No BU or momentary power down: H (Operates
less than 4ms after momentary power down)
ACC found: L, No ACC: H
Output L fi xed
H: ON, Hi-Z: OFF
H: Reset cancelled, L: Reset
L: Mute ON (Time constant solo setting: 10ms),
H: Normal
L: Mute ON (Time constant solo setting: 10ms),
H: Normal
L: Mute ON (Time constant solo setting: 10ms),
H: Normal (Countermeasure against IC2 shock
noise)
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