– 47 –
4-12. SCHEMATIC DIAGRAM – HAND MAIN BOARD (2/2) –
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.
•
C
: panel designation.
•
: B+ Line.
• Power voltages are dc 9 V and fed with regulated dc power
supply from external power voltage jack (J1004) on the
BASE MAIN board, dc 12 V and fed with regulated dc
power supply modular jack (J1003 or J1001) on the BASE
MAIN board with 100
Ω
in series, and dc 3.6 V and fed
with regulated dc power supply battery terminal on the
HAND MAIN board.
• Voltages and waveforms are dc with respect to ground in
test mode.
• Signal path.
N
: RX
O
: TX
F
: RX (INTERCOM)
f
: TX (INTERCOM)
P
: bell
Note on Printed Wiring Boards:
•
X
: parts extracted from the component side.
•
x
: parts extracted from the conductor side.
•
x
: parts mounted on the conductor side.
•
z
: Through hole.
•
: Pattern from the side which enables seeing.
•
: Through hole.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
2
U1001
rl
(XTAL1)
VOLT/DIV : 200 mV AC
TIME/DIV : 20 ns
420 mVp-p
54.3 ns
– HANDSET SECTION –
z
Waveforms
– BASE UNIT SECTION –
1
U3003
rl
(XTAL1)
VOLT/DIV : 200 mV AC
TIME/DIV : 20 ns
400 mVp-p
54.3 ns
Summary of Contents for SPP-A985 - Cordless Telephone With Answering System
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