WM-FX888
15
15
Note on Printed Wiring Board:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
6-3.
NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAMS
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
specified.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Total current is measured with no cassette installed.
• 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 in
no-signal (detuned) conditions.
no mark : PLAYBACK
(
) : FM
〈〈
〉〉
: AM
• 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
f
: AM
E
: PLAYBACK
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
• This board is four-layer printed board.
However, the patterns of layers 2 and 3 have not been in-
cluded in the diagram.
• Waveforms
1
IC3
uf
(XOUT)
2
Q801 (Collector)
3
Q801 (Base), Q803 (Emitter)
940 mVp-p
13.3
µ
s
3.5 Vp-p
192 ns
2 Vp-p
167 ns
4
Q802 (Collector), Q803 (Base)
0.3 Vp-p
184 ns
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
