Kenwood KDC-135 Service Manual page 6

KDC-135/135CR/136
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name
59 DSI
60 RDS DATA
61 RDS QUAL
62 VCC2
63 NC
64 VSS
65 RDS AFS M
66 TUN IFC OUT
67 PON EXT GND I/O
68 MUTE
69 ANALOG CON
70 LX RST
71 LX CON
72 LX MUTE
73 LX REQ M
74 RDS CLK
75 LX REQ S
76 PWIC SVR
77 PWIC STBY
78 PWIC MUTE
79 ACC DET
80 BU DET
81,82 NC
83 RDS NOISE
84 TUN SMETER
85 TYPE1
86 TYPE2
87 PWIC DC DET
88 LINE MUTE
89 OFFSET DET
90 PS2 2
91 PS2 1
6
I/O Application
I/O DSI control
I For European model terminal
I For European model terminal
-
- Not used
-
I/O For European model terminal
I Front-end IFC-OUT input
IC2 external input quick charge control
I/O Mute
O AUX/LX audio switching
O Forced reset to slave unit
O Start-up request to slave unit
I Mute request from slave unit
O Communication request to slave unit
I For European model terminal
I Communication request from slave unit
O SVR discharging circuit
O Power IC standby control
O Power IC mute
I ACC power supply detection
I Detection of momentary power down
O Not used
I For European model terminal
I S-meter input
I Destination switching
I Destination switching
I DC offset detection
I Line mute selection
I Power IC offset detection
O Power supply IC control
O Power supply IC control
Truth Value
Processing Operation Description
Table
OFF: Hi-z, Panel detached: Pulse drives, ON: H
Output L fixed
H: Station found, L: No station
L: OFF, Hi-Z: Quick charge, When IC2 is in source select:
Hi-Z, Mute L: L, Momentary power down/Power OFF: L
L: Mute OFF, Hi-Z: Mute ON
AUX: H (Switches after 100ms after first-out mute
begins to work), LX/Other source: L
H: Reset, L: Normal
H: Slave unit ON, L: Slave unit OFF
H: Mute ON, L: Mute OFF
Pull-down (GND)
During 500ms after 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 fixed
e
Refer to the truth value table
e
Refer to the truth value table
If DC offset is found 20 times in 100ms with condition
of over 1.0V, it will be judged as DC offset detected.
TEL mute: Below 1V, NAVI mue: Over 2.5V
r
Refer to the truth value table
r
Refer to the truth value table