Read Sony SRF-DR2000 Service Manual online
– 17 –
– 18 –
SRF-DR2000
4-4. SCHEMATIC DIAGRAM (MAIN SECTION)
r
Refer to page 23 for IC Block Diagrams.
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 3 V and fed with regulated dc power
supply from external power voltage jack.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
no mark : FM
• 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.
F
: FM
J
: Multiplex
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WAVEFORM (MAIN SECTION)
1
IC501
!™
1.7Vp-p
75kHz
VOLT/DIV : 0.5 V AC
TIME/DIV : 5
TIME/DIV : 5
µ
sec
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WAVEFORMS (MICOM SECTION)
1
IC301
!¢
2
IC101
#•
3
IC204
#º
VOLT/DIV : 0.5V AC
TIME/DIV : 0.1
TIME/DIV : 0.1
µ
sec
VOLT/DIV : 0.5V AC
TIME/DIV : 0.1
TIME/DIV : 0.1
µ
sec
VOLT/DIV : 0.5V AC
TIME/DIV : 0.1
TIME/DIV : 0.1
µ
sec
1.8Vp-p
4.9152MHz
2.5Vp-p
4.9152MHz
2.4Vp-p
8.192MHz
Power failure at
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