Sony XR-1790 (serv.man2) Service Manual ▷ View online
13
Adjustment Location:
Tape Speed Adjustment
– SET UPPER VIEW –
CN901
14
SECTION 5
DIAGRAMS
5-1.
NOTES FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
f
: internal component.
• b
: Pattern from the side which enables seeing.
2 Vp-p
222 ns
• Waveform
– MAIN Board –
– MAIN Board –
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.
tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise specified.
•
f
: internal component.
•
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 production toler-
ances.
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
E
: TAPE PLAYBACK
XR-1790
15
15
5-2.
PRINTED WIRING BOARD – MAIN Board –
• Semiconductor
Location
Ref. No.
Location
D1
I-4
D2
G-5
D3
F-5
D12
H-2
D100
F-9
D350
H-7
D351
F-9
D503
C-7
D506
D-5
D551
C-6
D600
D-5
D601
D-1
D602
E-1
D603
D-2
D605
D-4
D606
B-4
D607
E-5
D608
D-6
D609
D-2
D610
E-5
D611
D-3
D620
B-5
D621
D-5
D640
C-2
IC1
G-4
IC350
H-8
IC450
G-7
IC500
B-7
Q10
E-2
Q30
H-6
Q31
H-6
Q32
H-6
Q60
E-3
Q100
E-9
Q101
E-9
Q102
E-9
Q103
F-9
Q104
F-8
Q105
F-8
Q350
I-7
Q351
I-7
Q553
B-9
Q554
B-9
Q600
E-2
Q601
D-2
Q602
D-2
Q604
E-3
Q605
E-4
Q606
E-4
Q608
E-4
Q610
E-5
Q611
E-5
Q612
E-3
(Page 18)
XR-1790
16
16
5-3.
SCHEMATIC DIAGRAM – MAIN Board (1/2) –
•
See page 14 for Waveform.
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