Notes For Printed Wiring Boards; And Schematic Diagrams - Sony SPP-SS955 Service Manual

SPP-SS955
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7-3.

NOTES 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 / W or less unless otherwise
4
specified.
• C : panel designation.
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 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
T E
L 1 3 9 4 2 2 9 6 5 1 3
F
: RX(INTERCOM)
O
: TX
e : TX(INTERCOM)
P : bell
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• : parts mounted on the conductor side.
p
• 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 face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
• Indication of transistor.
C
Q These are omitted.
B E
w w w
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
x a o
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