ST-EX880/MS717
– 7 – – 8 –
SECTION 5
DIAGRAMS
5-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC 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.
•
¢
: internal component.
• 2 : nonflammable resistor.
• C : panel designation.
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
•
¢
: internal component.
• Indication of transistor.
Abbreviation:
HK : Hong Kong
JE : Tourist
MY : Malaysia
SP : Singapore
• U : B+ Line.
• V : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM (MW)
〈〈 〉〉 : STAND BY
[ ] : MUTING ON
• 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.
• Circled numbers refer to waveforms.
• Signal path.
F : FM
f : AM (MW)
Note: The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
B
These are omitted.
CE
Q
• Circuit Boards Location
• Waveforms
– MAIN Section –
1 IC51 1 (XIN)
2 IC201 $¡ (X2)
3 IC201 $¢ (XT2)
2.9Vp-p
4.5 MHz
– PANEL Section –
4 IC901 @º (XOUT)
5 IC901 @¡ (XIN)
4.4Vp-p
10 MHz
4.8Vp-p
32.768 kHz
5.2Vp-p
513 kHz
880 mVp-p
504 kHz
AC OUTLET board
(Tourist model)
TRANSFORMER board
PANEL board
RDS board
(ST-EX880)
MAIN boar
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
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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