Kenwood KRC-29Y, Service Manual

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KRC-29Y/35R,379R/RY,479R/RY,481R
5
MICROCOMPUTER'S TERMINAL DESCRIPTION
PORT
No.
PORT NAME I/O FUNCTION OPERATING CONDITION
41 P.CON-DET I P.CON short-circuited detection.
42 CH-CONT O Changer control.
43 - - -
44 CH-REC H O Changer request.
45-47 - - -
48 EN2-1 O Power supply IC control.
49 EN2-0 O Power supply IC control.
50 BEEP O Buzzer.
51 EN3 O Power supply IC control.
52 EN1 O Power supply IC control.
53 SW 5V O P.ON 5V control. "H" : OFF. "L" : ON.
54 MUSIC I Tape signal detection.
"H" : Signal does not exist.
"L" : Signal exist.
55 MS-CONT O Tape advanced sensitivity control. "H" : Play. "L" : FF/REW.
56 EQ-MUTE O Cassette tape muting. "H" : ON. "L" : OFF.
57 FWD/REV I Cassette tape running direction detection. "H" : FWD. "L" : REV.
58 SUB+ O Sub motor control.
59 SUB- O Sub motor control.
60 RESET I System reset.
61 REMOTE I Remote control.
62 R-CLK I RDS clock.
63 CH-REQ C I Changer request.
64 PACK-IN I Cassette tape pack-in detection.
65 KEY-REQ I Key signal detection.
66 - - -
67 VSS 0 - GND.
68 VDD 1 - VDD.
69 X2 - Main system clock.
70 X1 I Main system clock.
71 IC - -
72 - - -
73 XT1 - VDD.
74 VDD 0 - VDD.
75 AVREF 0 I Reference voltage.
76 S-METER I SD detection.
"H" : SD exists.
"L" : SD does not exist.
77 T-MODE I Cassette tape mode detection.
78 PHONE I
Navi mute : Over 2.5V.
Tel mute : less than 2.5V.
79 NOISE I Noise detection during FM mode.
80 AV CONT O Reference voltage.
(X14-) IC1 : µ -COM
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