Sony XR-4900 Service Manual ▷ View online
– 17 –
Adjustment Location:
– SET UPPER VIEW –
Tape Speed Adjustment
TU 1
RV 1 MW Auto Scan/Stop Level Adjustment
RV 2 FM Auto Scan/Stop Level Adjustment
RV 4 FM Stereo Separation Adjustment
– 18 –
• Waveforms
1
2
IC501
!§
XO
IC501
!™
OSC2
2.8Vp-p
18.432MHz
5.0Vp-p
32.768kHz
SECTION 6
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• 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.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : FM
<
no mark : FM
<
> : TAPE PLAYBACK
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM (MW)
E
: TAPE PLAYBACK
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
6-1. PRINTED WIRING BOARD — MAIN SECTION —
Ref. No.
Location
• Semiconductor
Location
D1
F-1
D51
F-11
D52
E-11
D351
I-12
D352
G-13
D501
J-5
D551
F-12
D552
F-12
D553
I-9
D554
F-12
D571
D-10
D572
D-10
D581
G-11
D588
E-9
D591
G-11
D601
J-13
D610
D-11
D611
D-11
D613
D-11
D614
C-11
D621
E-6
D622
E-7
D623
E-6
D624
E-7
D701
J-3
D702
K-3
D704
K-3
D705
K-5
D706
K-5
D707
K-5
D708
K-5
D709
K-5
D710
J-3
D711
K-5
D721
D-8
D722
D-8
D723
D-8
D724
D-9
D731
B-7
D732
D-7
D733
D-7
D734
B-7
D781
D-13
IC21
E-3
IC301
H-4
IC331
D-5
IC351
I-12
IC501
I-7
IC551
K-12
IC611
E-14
IC751
B-7
Q51
E-11
Q52
E-11
Q121
G-4
Q151
G-6
Q171
A-4
Q181
A-3
Q252
G-6
Q251
G-6
Q271
A-3
Q281
B-3
Q351
H-13
Q352
H-12
Q353
H-12
Q354
H-12
Q551
I-10
Q571
D-9
Q581
G-11
Q583
F-9
Q591
F-11
Q592
F-10
Q601
J-13
Q602
J-12
Q621
F-7
Q622
F-7
– 19 –
– 20 –
XR-4900
(Page 26)
– 21 –
– 22 –
XR-4900
6-2. SCHEMATIC DIAGRAM — MAIN (1/2) SECTION —
• Refer to page 18 for Waveforms.
• Refer to page 19 for Printed Wiring Board.
• Refer to page 29 for IC Block Diagrams.
Click on the first or last page to see other XR-4900 service manuals if exist.