SPP-S2720
27
27
4.3 Vp-p
167 ns
780 mVp-p
244 ns
6-3.
NOTE FOR PRINTED WIRING BOARDS 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.
•
%
: indicates tolerance.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 9V and fed with regulated dc power
supply from external power voltage jack (J201) on the
BASE MAIN board, dc 12V and fed with regulated dc
power supply from mojular jack (MJ101) on the BASE
MAIN board with 100
Ω
in series, and dc 3.6V and fed
with regulated dc power supply from battery connector
(CN101) on the HAND MAIN board.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
• 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.
N
: RX
O
: TX
P
: BELL
Note on Printed Wiring Board:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•
: Connected by carbon pattern.
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
• Waveforms
– BASE MAIN Board –
1
IC301
tk
(CF2)
2 V/DIV, 50 ns/DIV
2
IC402
td
(XOUT)
500 mV/DIV, 200 ns/DIV
3
IC1
wl
(BCLK)
2V/DIV, 10
µ
s/DIV
4
IC1
w;
(MCK), IC3
4
2 V/DIV, 100 ns/DIV
5
IC1
wk
(SYNC)
2 V/DIV, 100
µ
s/DIV
– HAND MAIN Board –
3.1 Vp-p
15.6 ms
5.5 Vp-p
96 ns
3.1 Vp-p
125 ms
Summary of Contents for SPP-S2720
Page 51: ...51 SPP S2720 MEMO ...
