– 17 –
– 19 –
– 18 –
WM-FX277/FX467/FX467ST
4-4. SCHEMATIC DIAGRAM
Note:
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
U
: 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 (RADIO SECTION),
PLAY (TAPE SECTION)
<
> : TV
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
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, TV
E
: PB
r
Waveforms
1
IC702
1
XOUT
2
3
VOLT/DIV : 0.1 V AC
TIME/DIV : 5
µ
sec
Q401
C
Q401
B
VOLT/DIV : 0.5 V AC
TIME/DIV : 0.1
µ
sec
VOLT/DIV : 10mV AC
TIME/DIV : 0.1
µ
sec
425 mVp-p
75 kHz
1.8 Vp-p
319 nsec
55 mVp-p
319 nsec
z
Refer to page 20 for IC Block Diagrams.
w w w
.
x i a o y u 1 6 3 .
c o m
Q Q
3 7 6 3 1 5 1 5 0
9
9
2
8
9
4
2
9
8
T E L
1 3 9 4 2 2 9 6 5 1 3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
