Kenwood KRC-708 Service Manual page 4

KRC-708/888/X858/PS988R
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3 7 63 1515 0 MICROCOMPUTER TERMINAL DESCRIPTION
UPD784217GC103(105) (IC1: X14-618X-XX)
System MicroComputer
Pin Pin Name
52 P84/A4
53 P85/A5
54 P86/A6
55 P87/A7
56 P40/AD0
57 P41/AD1
58 P42/AD2
59 P43/AD3
60 P44/AD4
61 P45/AD5
62 P46/AD6
63 P47/AD7
64 P50/A8
65 P51/A9
66 P52/A10
67 P53/A11
68 P54/A12
69 P55/A13
70 P56/A14
71 P57/A15
TE
L 13942296513
72 Vss
73 P60/A16
74 P61/A17
75 P62/A18
76 P63/A19
77 P64/RD
78 P65/WR
79 P66/WAIT
80 P67/ASTB
81 Vdd
82 P100/TI5/TO5
83 P101/TI6/TO6
84 P102/TI7/TO7
85 P103/TI8/TO8
86 P30/TO0
87 P31/TO1
88 P32/TO2
89 P33/TI1
90 P34/TI2
91 P35/TI00
92 P36/TI01
93 P37
94 TEST
95 P90
96 P91
www
97 P92
98 P93
99 P94
100 P95
4
Signal Name I/O
WIDE O
NARROW I/O K2I Forced Narrow output.
AFC I
SRM_SW2 I
QUAL I
R_DATA I
SRM_DET I
FM_SD I
N.C. O
MUSIC I
B/C O
Dolby O
EQ_MUTE O
MTL O
F/R O
MSC O
MODE3 I
MODE1 I
MODE2 I
PACK_DET I
GND -
TYPE0 I
TYPE1 I
TYPE2 I
ST_TYPE0 I
ST_TYPE1 I
N.C. O
N.C. O
N.C. O
Vdd -
SVR O
PREMUTE O
PMUTE O
CASS/SRM O
ANT_CON O
AM+B O
FM+B O
P_CON O
ACC_DET I
REMO I
P_ON O
BU_DET I
TEST -
IC2_SDA I/O IC2, IC5 and EEPROM data line.
IC2_SCK O
MUTE O
SW5V O
x ao
y
N.C. O
N.C. O
. i
8
Purpose
K2I Forced Wide output.
Noise detection time constant SW
SRM eject position detection.
RDS reception quality.
RDS data input.
SRM mechanism detection.
FM SD input.
Blank detection input.
Dolby B/C switching.
Dolby output.
EQ muting output.
Metal output.
Tape EQ input switching.
Blank detection time constant
switching.
Cassette mechanism mode detection.
Cassette mechanism mode detection.
Cassette mechanism mode detection.
Q Q
Cassette mechanism pack detection.
3 6 7 1 3
GND terminal.
Destination type terminal 0.
Destination type terminal 1.
Destination type terminal 2.
IC2 Ver.3 destination type terminal 0.
IC2 Ver.3 destination type terminal 1.
Not used.
Not used.
Not used.
B.U.5V
SVR discharge control.
PRE mute.
Power IC muting.
Cassette mechanism / SRM
mechanism voltage SW terminal.
Antenna control.
AM power supply.
FM power supply.
Power control.
Acc detection.
Remote control input.
Power supply control.
Momentary power down detection.
Test terminal.
IC2, IC5 and EEPROM clock line.
Muting terminal.
5 V power supply.
u163
Not used.
Not used.
.
2 9 9 4 2 8
Operation Description
H:Forced Wide
H:Forced Narrow
During reception: Hi
/During search: Lo.
EJECT:Hi
Detected: Lo /Not detected: Hi.
Station detected: Hi
/Not detected: Lo.
Music detected: Lo
/Music not detected: Hi.
B = Lo, C = Hi
ON : Hi, OFF : Lo
During play: Lo /FF or REW:
NOMAL : Hi, METAL : Lo
FWD:Lo, REW:Hi
During play: Hi /FF or REW:
Lo.
Pack detected: Lo.
1 5 0 5 8 2 9 9 4
POWER OFF:Hi
Active: Lo.
P IC ON : Hi
C mech.:Hi, SRM mech.:Lo
Active: Hi.
Active: Hi.
Active: Hi.
Active: Hi.
Acc OFF:Hi.
POWER ON:Hi
Power down: Hi.
m
OPEN:MUTE ON
Lo=SW5 ON
co
9 9
2 8 9 9