– 35 –
Pin No. Pin Name I/O Function
1 AMSSEL I Setting terminal for the AMS selection fixed at “L”
2 POS3 I
3 POS2 I
4 POS0 I
5 POS1 I
6 TAPEON O Tape system power supply on/off control signal output terminal “H”: tape on
7 CM ON O Capstan/reel motor (M901) drive signal output terminal “H”: motor on
8 LM LOD O
Loading/tape operation motor control signal output to the MM1322XFBE (IC351)
(For the loading direction and forward side operation) *1
9 LM EJ O
Loading/tape operation motor control signal output to the MM1322XFBE (IC351)
(For the eject direction and reverse side operation) *1
10 TUNON O Tuner system power supply on/off control signal output to the BA3918 (IC611) “H”: tuner on
11 FM ON O FM system power supply on/off control signal output to the BA3918 (IC611) “H”: FM on
12 PW ON O Main system power supply on/off control signal output to the BA3918 (IC611) “H”: power on
13 MUT O Line muting control signal output terminal “H”: line muting on
14 VOLCE O Chip enable signal output to the electrical volume (IC331)
15 VOLCKO O Serial data transfer clock signal output to the electrical volume (IC331)
16 VOLSO O Serial data output to the electrical volume (IC331)
17 AMPON O Standby control signal output to the power amplifier (IC751) “L”: standby
18 AMPMUT O Muting control signal output to the power amplifier (IC751) “L”: muting on
19 DX/LO O Local/DX selection signal output to the FM/AM tuner unit (TU1) “L”: DX, “H”: local
20 NCO O Not used (open)
21 GND — Ground terminal
22 DSTSEL I
23 D-BASS I D-BASS switch (SW951) input (A/D input)
24 KEYIN1 I
25 KEYIN0 I
26 RC IN0 I Rotary remote commander shift key A/D input terminal
27 VSM I FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1)
28 AMIFIN I AM intermediate frequency detection signal input from the FM/AM tuner unit (TU1)
29 FMIFIN I FM intermediate frequency detection signal input from the FM/AM tuner unit (TU1)
30 VDD2 — Power supply terminal (+5V)
31 FM OSC I FM local oscillator detection signal input from the FM/AM tuner unit (TU1)
32 AM OSC I AM local oscillator detection signal input from the FM/AM tuner unit (TU1)
33 GND — Ground terminal
Tape position detect input from tape operation switch on the mechanism block
Key input terminal (A/D input)
XR-4790: OFF, SOURCE, MODE *, + ) + SEEK AMS, – = 0 SEEK AMS,
VOLUME –, SEL, VOLUME +, ATT , DSPL, BTM, LCL keys input (LSW901 to LSW912)
XR-4800: OFF, SOURCE, MODE *, + ) + SEEK AMS, – = 0 SEEK AMS,
VOLUME –, SEL, VOLUME +, ATT, DSPL, BTM, LCL keys input
(LSW901 to LSW909, LSW930, LSW911 and LSW912)
Key input terminal (A/D input)
XR-4790: 6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, 4, PRST +/– keys input
(LSW921 to LSW927, LSW929 and LSW930)
XR-4800: 6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, 4 keys input
(LSW921 to LSW927)
IC501 µPD17708GC-567-3B9 (XR-4800; E model) (SYSTEM CONTROLLER)
Destination setting terminal
XR-4790, XR-4800; US, Canadian models: fixed at center voltage
XR-4800; E model: frequency select switch (S502) input
“L”: AM 9k step or FM 50k step, “H”: AM 10k step or FM 200k step
• MAIN BOARD IC501 µPD17707GC-529-3B9 (XR-4790, XR-4800; US, Canadian models)
6-7. IC PIN FUNCTION DESCRIPTION
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