Sony MDR-RF430, Service Manual

Page: 8 / 12

– 9 – – 10 –
MDR-RF430/RF450
r
Refer to page 6 for IC Block Diagrams.
Note:
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
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 3V and fed with regulated dc power
supply from battery terminal.
• Voltages are dc with respect to ground under no-signal
conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
r WAVEFORM
1
IC301
@¡ VOLT/DIV : 2m V AC
TIME/DIV : 20
µ
sec
10mVp-p
20.4
µ
sec
3-2. SCHEMATIC DIAGRAM