Note For Printed Wiring Boards And Schematic Diagrams - Sony SPP-A2770 Service Manual
Cordless telephone with answering system
Hide thumbs
Also See for SPP-A2770:
- Operating instructions manual (88 pages) ,
- Specifications (2 pages)
Table of Contents
Advertisement
6-3.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
: Through hole.
a
•
: 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.
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
/
W or less unless otherwise
4
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 100Ω 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 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.
N
: RX
O
: TX
P
: BELL
• Waveforms
– BASE MAIN Board –
1 IC301 tk (CF2)
2 V/DIV, 50 ns/DIV
4.3 Vp-p
167 ns
2 IC402 td (XOUT)
500 mV/DIV, 200 ns/DIV
780 mVp-p
244 ns
27
27
– HAND MAIN Board –
3 IC1 wl (BCLK)
2V/DIV, 10µs/DIV
3.1 Vp-p
15.6 ms
4 IC1 w; (MCK), IC3 4
2 V/DIV, 100 ns/DIV
5.5 Vp-p
96 ns
5 IC1 wk (SYNC)
2 V/DIV, 100 µs/DIV
3.1 Vp-p
125 ms
SPP-A2770
Advertisement
Table of Contents
