Sony XR-4790 / XR-4800 / XR-7850 (serv.man2) Service Manual ▷ View online
– 17 –
SECTION 6
DIAGRAMS
• IC Block Diagrams – MAIN Section –
IC301
IC301
CXA2509AQ-T4
+
–
–
+
–
+
–
+
–
+ –
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
PBFB1
PBRIN1
PBREF1
PBFIN1
35
36
PBGND
VCT
PBFIN2
PBREF2
PBRIN2
PBFB2
PBEQ1
PBOUT1
VCC
TAPEIN1
AUXIN1
MSLPF
LINEOUT1
NC
NC
G2FB
G1FB
MSTC
DGND
MSOUT
NC
NC
INSW
TAPESW
MSMODE
DRSW
MSSW
NC
NC
LINEOUT2
DIREF
AUXIN2
TAPEIN2
PBEQ2
PBOUT2
GND
F2
120
µ
/70
µ
X1
X1
VCT
+
F1
120
µ
/70
µ
24dB
F3
LPF
VCC
DETECT
MS ON/
OFF
FWD/RVS
TAPE EQ
TAPE/AUX
NR BIAS
24dB
MS
MODE
T2
T1
IC361
MM1322XFBE
1
2
3
4
5
6
7
8 OUT2
VS
OUT1
GND
IN1
VCC
IN2
GND
CONTROL CIRCUIT
IC401
LC75373ED
+
–
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
–
+
–
+
–
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
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
– 18 –
IC601
BA3918-V2
+
–
+
–
+
–
+
–
OVER VOLTAGE
PROTECT
REGULATOR
1
2 3 4
5
6
7
8
9
10
12
11
NC
MODE2
MODE1
STB
VDD
AMP
VCC
ANT
COM
AM
FM
GND
– 19 –
4.6 Vp-p
220 ns
• Waveform – MAIN Section –
1
IC501
&¶
– 37 –
6-7.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501
µ
PD17707GC-529-3B9 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1
ILLIN
I
XR-4790: fixed at “H”, XR-4800: 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 (IC361)
(For the loading direction and forward side operation) *1
(For the loading direction and forward side operation) *1
9
LM EJ
O
Loading/tape operation motor control signal output to the MM1322XFBE (IC361)
(For the eject direction and reverse side operation) *1
(For the eject direction and reverse side operation) *1
10
TUNON
O
Tuner system power supply on/off control signal output to the BA3918 (IC601) “H”: tuner on
11
FM ON
O
FM system power supply on/off control signal output to the BA3918 (IC601) “H”: FM on
12
PW ON
O
Main system power supply on/off control signal output to the BA3918 (IC601) “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 (IC401)
15
VOLCKO
O
Serial data transfer clock signal output to the electrical volume (IC401)
16
VOLSO
O
Serial data output to the electrical volume (IC401)
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
AM MONO
O
AM forced monaural signal output terminal Not used (open)
21
GND
—
Ground terminal
22
DSTSEL1
I
Destination setting terminal (fixed at center voltage)
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 (MW/LW) signal meter voltage detection input from the FM/AM tuner unit (TU1)
28
AMIFIN
I
AM (MW/LW) 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 (MW/LW) local oscillator detection signal input from the FM/AM tuner unit (TU1)
33
GND
—
Ground terminal
34
N.C.
—
Not used (open)
35
EO1
O
Main charge-pump control signal output terminal
36
TEST0
I
Setting terminal for the test (fixed at “L”)
Tape position detect input from tape operation switch on the mechanism block
Key input terminal (A/D input)
XR-4790: OFF, SOURCE, MODE
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
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)
(LSW901 to LSW909, LSW930, LSW911 and LSW912)
Key input terminal (A/D input)
XR-4790:
XR-4790:
6, 1, 2, 3, 6, ATA 5, 4, PRST +/– keys input
(LSW921 to LSW927, LSW929 and LSW930)
XR-4800:
XR-4800:
6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, MTL 4 keys input
(LSW921 to LSW927)
Click on the first or last page to see other XR-4790 / XR-4800 / XR-7850 (serv.man2) service manuals if exist.