— 11 —
SECTION 5
DIAGRAMS
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
/
4
W or less unless otherwise
specified.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Total current is measured with no cassette installed.
• Power voltage is DC 3V and fed with regulated DC power
supply from external power voltage jack.
• Voltages and waveforms are DC with respect to ground
under no-signal (detuned) conditions.
no mark : FM/PB
(
) : AM
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10
M
Ω
) .
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: FM
f
: AM
E
: PB
Note on Printed Wiring Board:
•
Y
: parts extracted from the conductor side.
•
®
: Through hole.
•
b
: 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
(Conductor B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component A)
the parts face are indicated.
• IC BLOCK DIAGRAMS
IC1 TA2104
24
23
22
21
20
19
18
17
16
15
14
13
DECODE
DIVIDE
VCO
11
10
9
8
7
6
5
4
3
2
1
12
FM RF OUT
RF GND
FM RF IN
AM IF IN
FM IF IN
GND
AGC
QUAD
R-OUT
L-OUT
AM LOW
CUT
MIX OUT
VCC
RF VCC
AM RF IN
FM OSC
AM OSC
OSC OUT
ST LED
IF REQ
DET OUT
LPF1
LPF2
FM
OSC
AM
OSC
AM
MIX
FM
MIX
BUFF
BUFF
FM
RF
AMIF
FMIF
AGC
MUTE
ST/MO
FM/AM
FM
DET
AM
DET
1/8
LEVEL
DET
IF
BUFF
AF
BUFF
AF
IF
REQ
SW
ST
•
Abbreviation
CND
: Canadian
IT
: Italian
EE
: East European
FR
: French
C & SA : Central and South America
•
Abbreviation
CND
: Canadian
IT
: Italian
EE
: East European
FR
: French
C & SA : Central and South America
Summary of Contents for RWALKMAN WM-FX487
Page 3: ...SECTION 1 GENERAL 3 ...
Page 4: ... 4 ...
