Ic Block Diagrams - Sony WM-FS555 Service Manual

Note on Schematic Diagram: MAIN SECTION
• 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.
• : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3V 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
(( )) : TV
< > : PLAY(TAPE)
• 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.
• Signal path.
F
: FM
f
: AM
E
: PB
• Abbreviation
CND : Canadian

4-6. IC BLOCK DIAGRAMS

IC1 TA2154FN (EL)
30 29 28 27 26
AM
MIX
TV RF
FM/TV
MIX
FM RF
1 2 3 4 5
25 24 23 22 21
BUFF
AM FM/AM/TV
1/2
OSC PW SW
FM TV 1/8 OR
BUFF
OSC OSC 1/16
IF BUFF
AM
DET
BUFF
FM IF
AM IF
AGC
6 8 9 10
7
Waveforms
z
1
75.0 kHz
IC701 tg
VOLT/DIV : 0.5V AC
XOUT
TIME/DIV : 10 µsec
2
2.65 MHz
0.38 µsec
Q401 C
VOLT/DIV : 0.5V AC
TIME/DIV : 0.2 µsec
19
20 18 17
16
SW
LEVEL
DET
FM
DET
FM MPX
AF
11
12 13 14
15
WM-FS555/FS556
1.3 Vp-p
1.1 Vp-p
13