– 27 –
– 28 –
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.
•
C
: panel designation.
Note on Printed Wiring Board:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
p
: parts mounted on the conductor side.
•
b
: Pattern on the side which is seen. (Carbon battern)
•
b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts on the parts face side seen from
(Side A)
C
B
E
Q
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
•
U
: B+ Line.
• Power voltage is dc 9 V and fed with regulated dc power
supply from external power voltage jack (J601 on the
BASE MAIN board).
• Power voltage is dc 12 V and fed with regulated dc power
supply from modular jack (MJ101 on the BASE MAIN
board) with 100
Ω
in series.
• Power voltage is dc 3.6 V and fed with regulated dc power
supply from battery terminal (CN301 on the HAND MAIN
board).
• Voltages and waveforms are dc with respect to ground in
test mode.
• 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
F
: RX(INTERCOM)
O
: TX
e
: TX(INTERCOM)
P
: bell
SPP-SS955
7-4.
PRINTED WIRING BOARDS – BASE MAIN Board (Side A)/BASE MICROPHONE Board (Side A) –
• Semiconductor
Location
(BASE MAIN Board)
Ref. No.
Location
IC602
G-4
IC701
F-2
IC751
D-3
IC951
B-4
Q208
E-9
Q209
F-10
Q210
F-11
Q211
F-10
7-3.
NOTES FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS
R781
C767
C768
(Page 37)
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
