Schematic Diagram (Main Section) - Sony SCT-ID10 Service Manual

6-4. SCHEMATIC DIAGRAM (MAIN SECTION)

Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1 / W or less unless otherwise
4
specified.
• ¢ : internal component.
Note: Note:
The components identi- Les composants identifiés
fied by mark ! or dotted par une marque ! sont cri-
line with mark ! are cri- tiques pour la sécurité.
tical for safety. Ne les remplacer que par
Replace only with part une piéce portant le
number specified. numéro spécifié.
r Refer to page 23 for IC Block Diagrams.
• U : B+ Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM (RADIO SECTION)
TALK (TELEPHONE SECTION)
( ) : AM (RADIO SECTION)
• Voltages are taken with a VOM (Input impedance 10 MΩ).
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.
– 17 –
• Signal path.
r WAVEFORM
F : FM
N 1
: RX (From Tel Line)
O
: TX (To Tel Line)
P
: bell
0.34 µ sec
IC301 !º
0.2Vp-p
VOLT/DIV : 0.1V AC
TIME/DIV : 0.2 µsec
– 18 –
SCT-ID10