Schematic Diagrams - Sony ICF-M770L Service Manual

5-2. NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• W : indicates side identified with part number.
• : internal component.
f
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• IC Block Diagram
IC1 CXA1019S
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
AM IF DET AGC
TUNING
METER
AF POWER AMP AM FE FM IF
FM
DISCRIMINATOR
FM FE
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Note on Schematic Diagram:
• 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.
f
• C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• A : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 6 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground in
no-signal (detuned) conditions.
no mark : FM
( ) : SW
[ ] : MW
〈〈 〉〉 : LW
• 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.
• Signal path.
F
: FM
f
: MW/LW
• Circuit Boards Location
power board
inlet board
9 9
ICF-M770L/M770S/M770SL
jack board
main board
key board