Read Sony XR-3750 / XR-3758 / XR-3759 / XR-7750 / XR-C350 / XRS-888 Service Manual online
– 22 –
6-1.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501
µPD17708GC-535-3B9 (SYSTEM CONTROL)
SECTION 6
DIAGRAMS
1
ILLIN
I
ILLIN signal detection pin
2,3
POS3, POS2
I
Tape position detection pin
4,5
POS0, POS1
I
Tape position detection pin
6
TAPEON
O
Tape power supply control pin
7
CM_ON
O
Capstan motor control pin
8
LM_LOD
O
Loading motor control pin (loadig direction)
9
LM_EJ
O
Loading motor control pin (eject direction)
10
TUNON
O
Tuner power supply control pin
11
FM_ON
O
FM power supply control pin
12
PW_ON
O
System power supply control pin
13
MUT
O
System muting control pin
At muting: “H”
14
VOLCE
O
Chip enable output pin to electrical volume
15
VOLCKO
O
Clock output pin to electrical volume
16
VOLSO
O
Data output pin to electrical volume
17
AMPON
O
Power amp power supply control pin
18
AMPMUT
O
Power amp muting control pin
At muting: “L”
19
DX_LO
O
DX/local selection control pin
20
AM_MONO
O
AM forced monaural signal output pin
21
GND
–
GND
22
DSTSEL1
I
Destination setting pin (A/D input)
23
D-BASS
I
D-BASS switch input pin (A/D input)
24,25
KEYIN1,KEYIN0
I
Key input pin (A/D input)
26
RC_IN0
I
Rotary remote commander input pin (A/D input)
27
VSM
I
FM/AM signal meter voltage detection pin (A/D input)
28
AMIFIN
I
AM(MW, SW) IF input pin
29
FMIFIN
I
FM IF input pin
30
VDD2
–
Power supply
31
FM_OSC
I
FM OSC signal input pin
32
AM_OSC
I
AM OSC signal input pin
33
GND
–
GND
34
N.C.
–
Not used
35
EOI
O
Main charge-pump output pin
36
TEST0
I
Test pin
37
AM_STIN
I
AM stereo signal input pin
38
SEKOUT
O
SEEK control signal output pin
39
MW_SW
O
MW/SW power supply select pin (Not used)
40
BEEP
O
Beep sound output pin
41
KEYACK
O
Key acknowledge signal input pin
42
BU_IN
I
Back up power supply detection pin
METAL control input/output pin
At initial mode: auto/manual selection input of METAL function.
At initial mode: auto/manual selection input of METAL function.
“L”: manual
43
MTLSEL
I/O
At manual mode: METAL on/off output.
“H”: on
At auto mode: input at %ª MTLIN
DOLBY control input/output pin
44
DOLON
I/O
At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
At normal mode: DOLBY on/off output
45
AMSIN
I
Tape music with/without detection pin
“L”: with music
46
ST
I/O
Stereo detection signal input and forced monaural signal output pin
47
AMS_ON
O
At AMS: “L”
Pin No.
Pin Name
I/O
Function
Click on the first or last page to see other XR-3750 / XR-3758 / XR-3759 / XR-7750 / XR-C350 / XRS-888 service manuals if exist.