Diagrams; 6-1. Ic Pin Function Description - Sony XR-1750 Service Manual

6-1. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC501 µPD17707GC-522-3B9 (SYSTEM CONTROL)
Pin No. Pin Name I/O
1 NIL –
2, 3 POS3, POS2 I
4, 5 POS0, POS1 I
6 TAPEON O
7 CM_ON O
8 LM_LOD O
9 LM_EJ O
10 TUNON O
11 FM_ON O
12 PW_ON O
13 MUTE O
14 VOLCE O
15 VOLCKO O
16 VOLSO O
17 AMPON O
18 AMPMUT O
19 DX_LO O
20 NC1 –
21 GND –
22 DSTSEL I
23 D_BASS I
24,25 KEYIN1,KEYIN0 I
26 RC_IN0 I
27 VSM I
28 AMIFIN I
29 FMIFIN I
30 VDD –
31 FM_OSC I
32 AM_OSC I
33 GND –
34 NC2 –
35 EO1 O
36 TEST0 I
37 NC3 –
38 SEKOUT O
39 MW_SW O
40 BEEP O
41 KEYACK O
42 BU_IN I
43 MTLSEL I/O
44 DOLON I/O
45 AMSIN I
46 ST I/O
SECTION 6

DIAGRAMS

Not used (Fixed at "L")
Tape position detection pin
Tape position detection pin
Tape power supply control pin
Capstan motor control pin
Loading motor control pin (loadig direction)
Loading motor control pin (eject direction)
Tuner power supply control pin
FM power supply control pin
System power supply control pin
System muting control pin At muting: "H"
Chip enable output pin to electrical volume
Clock output pin to electrical volume
Data output pin to electrical volume
Power amp power supply control pin
Power amp muting control pin At muting: "L"
DX/local selection control pin
Not used
GND
Destination setting pin (A/D input)
D-BASS switch input pin (A/D input)
Key input pin (A/D input)
Rotary remote commander input pin (A/D input)
FM/AM signal meter voltage detection pin (A/D input)
AM(MW,SW) IF input pin
FM IF input pin
Power supply
FM OSC signal input pin
AM OSC signal input pin
GND
Not used
Main charge-pump output pin
Test pin
Not used
SEEK control signal output pin
MW/SW power supply select pin (Not used)
Beep sound output pin
Key acknowledge signal input pin
Back up power supply detection pin
METAL control input/output pin
At initial mode: auto/manual selection input of METAL function "L": manual
At manual mode: METAL on/off output "H": on
At auto mode: input at %ª MTLIN
DOLBY control input/output pin
At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
Tape music with/without detection pin "L": with music
Stereo detection signal input and forced monaural signal output pin
– 18 –
Function