Kenwood KDC-237SA Service Manual page 5

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
24 PON FL O
25 NC -
26 PON PANEL I/O
27 NC -
28 PWIC BEEP O
29 AUD SCL I/O
30 AUD SDA I/O
31 VFD SYS DATA O
32 VFD PAN DATA I
33 VFD CLK O
34 VFD BLK O
35 CD SI O
36 CD SO I
37 CD CLK O
38 CD LOS SW I
39 PIO0 I
40 CD SRAMSTB O
41 EPM I
42 CD LOE LIM SW I
43 PON CD O
44 CD LOEJ I/O
45 CD MOTOR I/O
46 VFD CE O
47 CD DRIVEMUTE O
48 CD CCE O
49 CD DISC8 SW I
50 CD MRST O
51~53 NC -
54 CD MUTE I
55 CD DISC12 SW I
56 ROTARY CCW I
57 ROTARY CW I
58 NC -
59 DSI I/O
60 RDS DATA I
61 RDS QUAL I
62 VCC2 -
Application
Key illumination power supply control
Not used
Panel 5V control
Not used
Beep output
E-VOL clock output
E-VOL data input/output
VFD data output
VFD data input
VFD clock output
VFD data blanking output
CD mechanism serial output
CD mechanism serial input
Serial clock output
CD loading detection
Communication request from mechanism DSP
1M-bit SRAM standby
Flash EPM input
CD detection (Chucking SW)
CD mechanism power supply control
CD motor control
CD motor control
VFD control request
Motor driver mute output
CD mechanism chip enable
8cm disc detection
CD mechanism µ-com reset
Not used
CD mute request
12cm disc detection
VOL key input
VOL key input
Not used
DSI control
RDS decoder data input
RDS decoder QUAL input
KDC-237SA/237SAY
KDC-237SG/237SGY
Truth Value
Processing Operation Description
Table
ON: H, OFF: L
ON: L, Momentary power down/Panel detached
: Hi-Z, 11 minutes after ACC OFF: Hi-Z
Output L fixed
125kHz
H: Reset cancelled, L: Reset, Momentary power down
/Panel detached: L, 11 minutes after ACC OFF: L
1MHz
H: Data request
H: SRAM standby
Connects to VSS
H: Loading completed, L: No disc
H: Power ON
q
Refer to the truth value table
q
Refer to the truth value table
Pull-up (B.U.)
H: Normal, L: Reset
Output L fixed
L: Mute request
Pull-up (B.U.)
Detects pulse width
Detects pulse width
Output L fixed
OFF: Hi-z, Panel detached: Pulse drives, ON: H
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