Schematic Diagram - Microcomputer Section - Sony ICF-SC1 Service Manual

5-6. SCHEMATIC DIAGRAM – MICROCOMPUTER SECTION –
Note:
• X : parts extracted from the component side.
D : Chip components extracted from the rear side.
•
• : Through hole.
r
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
Refer to page 33 for IC Block Diagrams.
r
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.
• U : B+ Line.
• Power voltage is dc 6 V and fed with regulated dc power
supply from external power voltage jack (J402).
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : WFM/AM/NFM
( ) : AM/NFM
< > : NFM
– 25 –
• 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.
ICF-SC1/SC1PC
r WAVEFORMS
1 2
0.5Vp-p
32.7 µ sec
0.24 µ sec
IC604 *™ IC604 &ª
VOLT/DIV : 0.2 V AC
TIME/DIV : 20 msec
– 26 –
2Vp-p
VOLT/DIV : 1 V AC
TIME/DIV : 0.2 msec