Kenwood KDC-138 Service Manual page 5

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
43 PON CD O
44 CD LOEJ I/O CD motor control
45 CD MOTOR I/O CD motor control
46 VFD CE O
47 CD DRIVEMUTE O
48 CD CCE O
49 NC -
50 CD MRST O
51~53 NC -
54 CD MUTE I
55 CD DISC12 SW I
56 ROTARY CCW I
57 ROTARY CW I
58~61 NC -
62 VCC2 -
63 NC -
64 VSS -
65 NC -
66 TUN IFC OUT I
67 NC -
68 MUTE I/O Mute
69 NC -
70 LX RST O
71 LX CON O
72 LX MUTE I
73 LX REQ M O
74 NC -
75 LX REQ S I
76 PWIC SVR O
77 PWIC STBY O
78 PWIC MUTE O
79 ACC DET I
80 BU DET I
81~83 NC O
84 TUN SMETER I
85 TYPE1 I
86 TYPE2 I
Application
CD mechanism power supply control
VFD control request
Motor driver mute output
CD mechanism chip enable
Not used
CD mechanism μ-com reset
Not used
CD mute request
12cm disc detection
VOL key input
VOL key input
Not used
Not used
Not used
Front-end IFC-OUT input
Not used
Not used
Forced reset to slave unit
Start-up request to slave unit
Mute request from slave unit
Communication request to slave unit
Not used
Communication request from slave unit
SVR discharging circuit
Power IC standby control
Power IC mute
ACC power supply detection
Detection of momentary power down
Not used
S-meter input
Destination switching
Destination switching
X34-56xx-xx
Truth Value
Processing Operation Description
Table
H: Power ON
Refer to the truth value table
q
q Refer to the truth value table
H: Normal, L: Reset
Output L fi xed
L: Mute request
Pull-up (B.U.)
Detects pulse width
Detects pulse width
Output L fi xed
Output L fi xed
H: Station found, L: No station
L: Mute OFF, Hi-Z: Mute ON
H: Reset, L: Normal
H: Slave unit ON, L: Slave unit OFF
H: Mute ON, L: Mute OFF
Pull-down (GND)
During 500ms after power OFF and momentary
power down: H, Since then: L
Power ON: H, Power OFF: L
STANDBY source/Momentary power down: L,
TEL mute: L
ACC found: L, No ACC: H
BU found: L, No BU/Momentary power down: H
(Operates after less than 4ms after momentary
power down is detected)
Output L fi xed
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