Sony XR-4890 (serv.man2) Service Manual ▷ View online
6-2. SCHEMATIC DIAGRAM — MAIN (1/2) SECTION —
• Refer to page 15 for IC Block Diagrams.
– 19 –
– 20 –
XR-4890/4900
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.
•
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
• Waveforms
1
2
IC501
!§
XO
IC501
!™
OSC2
2.8Vp-p
18.432MHz
5.0Vp-p
32.768MHz
(Page 21, 22)
– 21 –
– 22 –
XR-4890/4900
6-3. SCHEMATIC DIAGRAM — MAIN (2/2) SECTION —
• Refer to page 15 for IC Block Diagrams.
• Refer to page 15 for IC Block Diagrams.
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.
•
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
• Abbreviation
CND : Canadian model.
(Page 19, 20)
(Page 25)
– 23 –
– 24 –
XR-4890/4900
6-4. PRINTED WIRING BOARD — PANEL SECTION —
Note:
• X
: parts extracted from the component side.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
Ref. No.
Location
• Semiconductor
Location
D902
B-12
D903
B-12
D904
B-11
D951
C-9
Q945
C-2
(Page 17)
Ref. No.
Location
• Semiconductor
Location
IC901
A-8
– 25 –
– 26 –
6-4. SCHEMATIC DIAGRAM — PANEL SECTION —
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.
•
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
(Page 22)
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production tol-
erances.
erances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tol-
erances.
erances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM (MW)
E
: TAPE PLAYBACK
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