Sony XR-1800 Service Manual ▷ View online
– 13 –
• IC Block Diagram – MAIN Board –
IC450
LC75372E
2
1
4
3
6
5
8
7
10
9
12
11
14
13
16
15
15
43
44
41
42
39
40
37
38
35
36
33
34
23
24
25
26
19
20
21
22
29
30
31
32
27
28
17
18
DECODER
LATCH
CONTROL
SHIFT
REGISTER
ROUT
RFIN
RFOUT
RROUT
RVREF
VREF
LVREF
LROUT
LFOUT
LFIN
LOUT
R2
R1
TEST
VSS
NC
CL
DI
CE
L2
VDD
L1
LT3
LT2
L10dBOUT
LT1
LIN
LCT2
LCT1
L10dBIN
LSELO
L3
NC
RT3
RT2
RT1
RIN
R10dBOUT
RCT2
RCT1
R10dBIN
RSELO
NC
R3
+
–
–
+
–
–
+
–
–
+
–
LVREF
LVREF
RVREF
LVREF
LVREF
LVREF
LVREF
LVREF
LVREF
+
–
+
–
+
–
+
–
+
–
+
–
–
RVREF
RVREF
RVREF
RVREF
RVREF
RVREF
RVREF
+
–
–
+
–
–
+
–
–
+
–
–
SECTION 5
DIAGRAMS
– 14 –
5-1.
NOTE FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS
AND SCHEMATIC DIAGRAMS
• Waveform
1
IC1
1
(XIN)
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
[
] : TAPE PLAYBACK
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
E
: TAPE PLAYBACK
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
2 Vp-p
222 ns
5-2.
PRINTED WIRING BOARD – MAIN Section –
– 15 –
– 16 –
XR-1800
• Semiconductor
Location
Ref. No.
Location
D1
J-4
D2
H-6
D3
G-6
D12
I-2
D13
I-5
D14
I-5
D15
I-6
D16
I-6
D17
I-6
D18
I-6
D19
I-6
D20
I-6
D100
G-9
D350
I-8
D351
G-9
D503
D-7
D506
E-6
D551
D-6
D600
E-5
D601
E-2
D602
F-2
D603
E-3
D605
E-4
D606
C-4
D607
F-5
D608
E-6
D609
E-2
D610
F-5
D611
F-5
D620
C-5
D621
E-5
IC1
H-4
IC350
H-9
IC450
H-7
IC500
C-7
Q10
F-2
Q30
I-7
Q31
H-6
Q32
H-6
Q60
F-3
Q100
E-9
Q101
E-9
Q102
F-9
Q103
F-9
Q104
G-8
Q105
F-8
Q350
J-7
Q351
J-7
Q553
C-9
Q554
C-9
Q600
F-2
Q601
D-2
Q602
E-2
Q604
F-3
Q605
F-4
Q606
F-4
Q608
F-4
Q610
F-5
Q611
F-5
Q612
F-3
XR-1800
5-3.
SCHEMATIC DIAGRAM – MAIN Section (1/2) –
•
See page 14 for Waveform.
– 17 –
– 18 –
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