Printed Wiring Boards (Microcomputer Section) - Sony ICF-SW07 Service Manual

5-7. PRINTED WIRING BOARDS (MICROCOMPUTER SECTION)

r Semiconductor
Note:
Location
• X : parts extracted from the component side.
•
r : Through hole.
Ref. No. Location
• b : Pattern of the rear side.
D501 C-2
• b : Pattern on the side which is seen.
D502 D-3
D503 D-3
D504 D-2
D505 D-2
r Waveform
D506 B-2
D507 C-2
1
IC501 B-3
IC502 C-5 732 mVp-p
IC503 B-5
IC504 C-2
IC505 B-2 32.768 kHz
IC506 D-2
VOLT/DIV : 0.2 V AC
IC507 C-3
X502
TIME/DIV : 10 µsec
IC508 D-3
Q501 C-4 Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
Q502 C-4
Q503 C-4 50 WV or less are not indicated except for electrolytics
Q504 C-3 and tantalums.
• All resistors are in Ω and
Q505 C-3 1
specified.
Q506 C-3 • U : B+ Line.
Q507 D-2 • H : adjustment for repair.
Q508 D-2
• Power voltage is dc 3V 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
• 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.
• The voltage isn't filled in the measurement impossibility
place.
– 55 –
5-8. SCHEMATIC DIAGRAM (MICROCOMPUTER SECTION)
/ W or less unless otherwise
4
– 56 – – 57 –
ICF-SW07
– 58 –