Kenwood RXD-803 Service Manual page 10

RXD-803/803E/853/853E/A83
4-4 Description of expander IC
TC74HC166AP(X13,IC15)
Pin No. Pin Name
1 SI
2 A-PLAY
3 B-PACK
4 R-REC
5 B-PLAY
6 CK INH
7 PSCLK
8 GND
9 CLR
10 A-CrO2
11 B-CrO2
12 F-REC
13 PSDATA
14 A-PACK
15 PSLOAD
16 Vdd
BU2090F(X13,IC16)
Pin No. Pin Name
1 Vss
2 DATA
3 CLK
4 BIAS
5 NOR
6 B SOL
7 A SOL
8 CPM
9 LMUTE
10 B-EQ
11 R MUTE
12 A-EQ
13 A/B
14 R/P
15 BEAT.C
16 Vdd
10
CIRCUIT DESCRIPTION
I/O
I NO USED
I A DECK Head Position Detection Switch Input
I B DECK Cassette Tape Detection Switch Input
I B DECK Reverse Recording prohibition Detection Switch Input
I B DECK Head Position Detection Switch Input
I NO USED
I CLOCK INPUT
- GND
I CONNECTED TO VDD
I A DECK CrO2 Detection Switch Input
I B DECK CrO2 Detection Switch Input
I B DECK Forward Recording prohibition Detection Switch Input
O DATA OUTPUT
I A DECK Cassette Tape Detection Switch Input
I SHIFT/LOAD CONTROL
- VDD
I/O
- GND
I DATA INPUT TERMINAL
I CLOCK INPUT
O NC
O DECK Normal/CrO2 Changeover Control
O NC
O NC
O NC
O DECK Line Mute Control
O B DECK Play Back Equalizer Control
O DECK Recording Mute Control
O A DECK Play Back Equalizer Control
O DECK A/B Changeover Control
O NC
O DECK Beat Cancel On/Off Changeover Control
- POWER SUPPLY(+5V)
Description
H = OFF
L = ON
H = prohibit
L = ON
H = CrO2
H = CrO2
H = prohibit
L = ON
Description
H=Normal
H= MUTE OFF L= MUTE ON
L=A DECK
H= ON
L = ON
H = OFF
L = permit
H = OFF
L = Normal
L = Normal
L = permit
H = OFF
L=CrO2
H=B DECK
L= OFF