Kenwood DPX502 Service Manual page 7

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
40 NC -
41 CD DISC12 SW I
42 CD LOS SW I
43 CD MUTE I
44 VFD CS O VFD control request
45 SOC S RST O SOC reset
46 SOC S STOP O SOC stop
47 CD DISC8 SW I
48 CD LOE LIM SW I
49 CD LOEJ I/O CD motor control
50 CD MOTOR O CD motor control
51 ROTARY CW I
52 ROTARY CCW I
53 PON PANEL I/O Panel 5V power supply control
54 PON FL+B I/O FL display fi lament power supply control
55 SW USB I/O V-BUS 5V control
56 NC -
57 PON ILL O Key illumination power supply
58,59 NC -
60 VCC2 -
61 PON O Power supply control
62 VSS -
63 TYPE 1 I
64 TYPE 2 I
65 NC -
66 PCON O External amplifi er control
67~69 NC -
70 ANT CON O Power antenna control
71 NC -
72 ACC DET I
73 BU DET I
74 ILLUMI DET I
75 S SYS REQ O
76 S SOC REQ I
77 PWIC MUTE O Power IC mute control
78 PWIC STBY O Power IC standby control
Application
Not used
12cm-disc detection
CD loading detection
CD mute request
8cm-disc detection
CD detection (Chucking SW)
VOL key detection
VOL key detection
Not used
Not used
GND
Destination switching
Destination switching
Not used
Not used
Not used
ACC power supply detection
Momentary power-down detection
Dimmer illumination detection
Communication request from system
µ-com to SOC
Communication request from SOC to
system µ-com
DPX502/502U/502UY
DPX-MP5100U
Truth
Processing / Operation / Description
Value Table
Output L fi xed
L: Mute request, H: Normal
H: VFD data can be transferred
H: Normal, L: Reset
H: Normal, L: SOC stopped
H: Loading completed, L: No disc
q
Refer to the truth value table
q
Refer to the truth value table
Detects pulse width
Detects pulse width
ON (For 11 minutes after ACC OFF): L
Momentary power down, panel detached, 11 minute after
ACC OFF: Hi-Z
H: ON, Hi-Z: OFF
H: ON, Hi-Z: OFF
Depends on command from SOC
Output L fi xed
H: Power ON, L: Power OFF
Output L fi xed
H: Power ON, L: Power OFF
w
Refer to the truth value table
w
Refer to the truth value table
Output L fi xed
Output L fi xed
Tuner ON: H
Output L fi xed
ACC found: L, No ACC: H
BU found: L, Momentary power down: H
L: ON, H: OFF
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