15
WM-FX495
Note on Schematic Diagram
• 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 speci-
fied.
•
f
: internal component.
•
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 M
Ω
).
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.
•
a
: Through hole.
•
: 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.
z
Waveforms
1
IC701
ua
VOLT/DIV : 1V AC
TIME/DIV : 5
µ
sec
XOUT
2
Q405
C
VOLT/DIV : 1V AC
TIME/DIV : 0.2
µ
sec
1.5Vp-p
75 kHz
1.6Vp-p
0.34
µ
esc
5-5. IC BLOCK DIAGRAMS
IC1 TA2154FN (EL)
12
13
14
19
15
FM/TV
MIX
8
9
10
TV RF IN
VCC
FM IF IN
AM IF IN
QUAD
DET OUT
MPX IN
LPF IN
R OUT
GND
1
4
2
3
5
6
FM FR IN
RF GND
FM MIX
AM MIX
AGC
7
AM
MIX
SW
FM/AM/TV
PW SW
1/2
FM
OSC
TV
OSC
1/8 OR
1/16
AM
DET
LEVEL
DET
FM MPX
FM
DET
AM
OSC
AGC
18
17
16
20
TV FM OSC
AM RF IN
OSC OUT
TV RF OUT
FM RF OUT
AM BYPASS
AM OSC
MODE2
MODE1
IF REQ
IF COUNT
LPF2B
LPF2A
L OUT
RFVCC
30
29
27
28
23
24
25
26
22
21
11
BUFF
IF BUFF
BUFF
BUFF
FM IF
AM IF
AF
TV RF
FM RF
Summary of Contents for Walkman WM-FX495
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