Ic Block Diagrams - Sony WM-FX495 Service Manual

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 speci-
4
fied.
• : internal component.
f
• C : panel designation.
• : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 1.5V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground under
no-signal (detuned) conditions.
• no mark : FM
( ) : AM
< > : Tape Play
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
E
: PB
F
: FM
f
: AM
Note on Printed Wiring Board
• X : parts extracted from the component side.
•
: Through hole.
a
•
: 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 the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.

5-5. IC BLOCK DIAGRAMS

IC1 TA2154FN (EL)
30 29 28
TV RF
FM RF
1 2 3
27 26 25 24 23
BUFF
AM
AM
1/2
MIX OSC
FM TV 1/8 OR
BUFF
OSC OSC 1/16
BUFF
FM IF
FM/TV
AGC
MIX
4 5 6 8
7
Waveforms
z
1
75 kHz
IC701 ua
XOUT
2
0.34 µ esc
Q405 C
22 21 20 19 18
FM/AM/TV
SW
PW SW
IF BUFF
LEVEL
DET
AM
DET
FM
DET
AM IF
FM MPX
AF
11
9 10 12 13
WM-FX495
1.5Vp-p
VOLT/DIV : 1V AC
TIME/DIV : 5 µsec
1.6Vp-p
VOLT/DIV : 1V AC
TIME/DIV : 0.2 µsec
17
16
14
15
15