Kenwood KDC-W4044UA Service Manual page 7

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
41 EPM I
42 CD MOTOR I/O CD motor control
43 NC -
44 CD DISC12 SW I
45 NC -
46 VFD CE O
47 NC -
48 ROTARY CCW I
49 ROTARY CW I
50 NC -
51 RDS DATA I/O RDS decoder data input
52 RDS QUAL I
53 CD MUTE I
54 S SOC REQ I
55 SOC RST O
56 SOC S STOP O
57 S SYS REQ O
58~61 NC -
62 VCC2 -
63 NC -
64 VSS -
65 RDS NOISE I
66 TUN SMETER I
67 TUN IFC OUT I
68 AUD DC ERR I
69 LX RST O
70 LX CON O
71 LX MUTE I
72 LX REQ M O
73 PWIC SVR O
74 RDS CLK I/O RDS decoder clock input
75 LX REQ S I
76 PWIC STBY O
77 PWIC MUTE O
Application
Flash ROM EPM input
Not used
12cm disc detection
Not used
VFD control request
Not used
VOL key input (Counter-clockwise)
VOL key input (Clockwise)
Not used
RDS decoder QUAL input
CD mute request
Communication request from SOC to system
μ-COM
SOC reset
SOC stop
Communication request from system μ-COM
to SOC
Not used
Not used
FM noise detection
S-meter input
Front-end IFC-OUT input
DC offset detection
Forced reset to slave unit
Start-up request to slave unit
Mute request from slave unit
Communication request to slave unit
SVR discharge circuit
Communication request from slave unit
Power IC standby control
Power IC mute
KDC-W4044UA/W4044UAY/W4044UG/W4044UGY
KDC-W413UA/W413UAY/W4544U/W4644UY
Truth Value
Processing Operation Description
Table
L: Possible to rewrite fl ash ROM
Connects to VSS (Never set it to output Hi)
q Refer to the truth value table
Output L fi xed
Output L fi xed
Output L fi xed
Detects pulse width
Detects pulse width
Output L fi xed
H: Normal, L: Mute request
H: Normal, L: Reset
H: Normal, L: SOC stopped
Output L fi xed
Output L fi xed
H: Station detected, L: No station
If DC offset is detected 20 times in 100ms with
condition below 1.0V, it will be judged as DC offset
is detected.
H: Reset, L: Normal
H: Slave unit ON, L: Slave unit OFF
H: Mute ON, L: Mute OFF
During 500ms after power OFF or momentary
power-down: H, Since then: L
Power ON: H, Power OFF: L
STANDBY source or momentary power-down: L,
TEL mute: L
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