Sony XR-3750 / XR-3758 / XR-3759 / XR-7750 / XR-C350 / XRS-888 Service Manual ▷ View online
– 21 –
Adjustment Location:
– SET UPPER VIEW –
TU1
RV1 AM (MW) Auto Scan/Stop Level Adjustment
RV2 FM Auto Scan/Stop Level Adjustment
RV4 FM Stereo Separation Adjustment
Tape Speed Adjustment
– 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
– 23 –
Pin No.
Pin Name
I/O
Function
48
N_ROUT
O
Forward/reverse control pin
49
TAPMUT
O
Tape muting control pin
At muting: “H”
Illumination power suply control pin
50
ILLON
O
At PW SEL on: ACC on: “H”
At PW SEL off: Power on: “H”
At PW SEL off: Power on: “H”
51
SD_IN
I
Station detection signal input pin
52
NOSESW
I
Front panel removal or attaching detection pin
53
TELMUT
I
Telephone muting detection pin
“L”: 20dB audio muting
54
REL_T
I
Reel table rotation detection pin
55
ACCIN
I
Accessory voltage detection pin
56
TESTIN
I
Test mode setting pin
57
RC_IN1
I
Rotary remote commander input pin (A/D input)
58
PW_SEL
I
Power select switch input pin
59
MTLIN
I
AUTO METAL detection pin
“L”: METAL
60
KEYACT
O
Power supply control pin for A/D conversion
61
KEYSEL0
I
Key function setting pin
62
KEYSEL1
I
Active select pin for #•SEKOUT
63
COLOR
I
Illumination color setting pin
“L”: amber, “H”: green
64
LCDCE
O
LCD chip enable output pin
65
LCDCKO
O
LCD clock output pin
66
LCDSO
O
LCD data output pin
67
LCDINH
O
LCD brank indication control pin
68
UNICKI
I
Clock input pin (for SONY BUS)
69
UNISO
O
Data output pin (for SONY BUS)
70
UNISI
I
Data input pin (for SONY BUS)
71
UNICKO
O
Clock output pin (for SONY BUS)
72
BUSON
O
BUS ON control signai output pin (for SONY BUS)
73
SYSRST
O
System reset signal output pin
74
VREG
O
CPU regurator output pin
75
GND
–
GND
76
X_OUT
O
System clock output pin (4.5 MHz)
77
X_IN
I
System clock input pin (4.5 MHz)
78
CE
I
Fixed at “H”
79
VDD1
—
Power supply
80
RESET
I
Reset input pin
– 37 –
IC301
CXA2509AQ-T4
•
IC Block Diagrams
+
–
–
+
–
+
–
+
–
+ –
1
2
3
4
5
6
7
8 9 10
20
19
18
17
16
15
14
13
12
11
21
22
23
26
27
28
29
30
31
32
33
34
37
38
39
40
24
25
PBFB2
PBRIN2
PBREF2
PBFIN2
35
36
PBGND
VCT
PBFIN1
PBREF1
PBRIN1
PBFB1
PBEQ2
PBOUT2
VCC
TAPEIN2
AUXIN2
MSLPF
LINEOUT2
TCH2
NC
PLAY
FF
MSTC
DGND
MSOUT
NC
NRSW
INSW
TAPESW
MSMODE
DRSW
MSSW
NC
TCH1
LINEOUT1
DIREF
AUXIN1
TAPEIN1
PBEQ1
PBOUT1
GND
F2
120
µ
/
70
µ
X1
X1
VCT
+
F1
120
µ
/
70
µ
NR
OFF/B
F3
LPF
VCC
DETECT
MS ON/
OFF
NR
MODE
FWD/RVS
TAPE EQ
TAPE/AUX
NR BIAS
NR
MS
MODE
OFF/B
T2
T1
+
–
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
–
+
–
+
–
DECODER
LATCH
SHIFT
REGISTER
CONTROL
–
+
+
–
–
1
2
3 4
5
6 7 8
9 10
20
19
18
17
16
15
14
13
12
11
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
43
44
LSELO
L4
L3
L3
L2
L1
VDD
R1
R2
R3
R4
R4
RSELO
RVRIN
RCOM
RT1
RT2
RT3
RTOUT
RSIN
RS1
RS2
RS3
RSOUT
RFIN
RFOUT
RROUT
VSS
CL
DI
CE
VREF
LROUT
LFOUT
LFIN
LSOUT
LS3
LS2
LS1
LSIN
LTOUT
LT3
LT2
LT1
LCOM
LVRIN
1
2
3
4
5
6
7
8 OUT2
VS
OUT1
GND
IN1
VCC
IN2
GND
CONTROL CIRCUIT
IC401
LC75373ED
IC361
MM1322XFBE
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