Read Sony EXR-105 / XR-3740 Service Manual online
– 14 –
SECTION 6
DIAGRAMS
Pin No.
Pin Name
I/O
Function
6-1.
IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC501 µD17708GC-545-3B9 (MASTER CONTROLLER)
1
ILLIN
I
ILLIN signal detection pin
2, 3
POS3, POS2
I
Tape position detection pin
4, 5
POS0, POS1
6
TAPEON
O
Tape power supply control pin
7
CM_ON
O
Capstan motor control pin
8
LM_LOD
O
Loading motor control pin (loading 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
VOLCLO
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
DSTSEL
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
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
43
MTLSEL
I/O
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
At manual mode: METAL on/off output
“H”: on
At auto mode: input at %ª MTLIN
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