Note For Printed Wiring Boards And Schematic Diagrams - Sony SPP-N1025 Service Manual

5-3.

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.
z
• : Pattern from the side which enables seeing.
• : Carbon pattern.
(The other layers' patterns are not indicated.)
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 – – HAND MAIN Board –
1 U7 wd (XOUT) qa U2 3 (XOUT)
1 V/DIV, 50 ns/DIV 1 V/DIV, 50 ns/DIV
3.9 Vp-p
125 ns 125 ns
2 U3 5 (XOUT) qs U2 7 (XTOUT)
1 V/DIV, 20 µs/DIV
500 mV/DIV, 100 ns/DIV
1 Vp-p
30.5 µs
279 ns
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.
• C : panel designation.
• A : B+ Line.
• Power voltages are dc 9 V and fed with regulated dc power
supply from external power voltage jack (J3) on the BASE
MAIN board, dc 12 V and fed with regulated dc power
supply from modular jack (J7) on the BASE MAIN board
with 100 Ω in series, and dc 3.6 V and fed with regulated
dc power supply from battery terminal (J5) 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
O : TX
P : BELL
3.9 Vp-p
2.4Vp-p
• IC Block Diagrams
– BASE MAIN Board –
U3 PCC318
DCB RD 1 SELECT
DCCOMPA 2
VDDD 3
XIN 4 CRYSTAL
OSCILLATOR
XOUT 5
VSSD 6
VSSA 7
BAND PASS FILTER
REFERENCE
VREF 8
GENERATOR
BAND PASS FILTER
INSE 9
+
–
SWITCH ADC BAND PASS FILTER
INP 10
+
–
INN 11
OUT 12
+
DC MEASUREMENT
ADC
–
U4 U4082B
27 26 25 24 22
28 23 21
RX
ATTEN- DIAL
UATOR TONE
DETECTOR
BACKGROUND
LEVEL
NOISE
DETECTOR
DETECTOR
LEVEL COMPARATOR
DETECTOR
VCC AGC
HYBRID VR HYBRID
VR
AMP 2 AMP 1
FILTER +
+
AMP
–
–
1 2 3 4 5
6 7
15 15
SPP-N1025/N1026
DC B
DC A
SELECT
CAS DETECTOR
FSK RECEIVER
DIAL TONE
DETECTOR
SERIAL
INTERFACE
DIAL TONE
ENERGY DETECTOR
RING DETECTOR
UNIT
DTMF D/A CONVERSION
+
GENERATOR AND FILTERING
–
U14 KA8602D
20 19 17 15
18 16
IN+ 1
IN– 2
VREF
OUT1 3
BACKGROUND
VCC 4
LEVEL
NOISE
DETECTOR
DETECTOR
COMPARATOR LEVEL
DETECTOR
MIC
TX
VR
AMP
ATTENUATOR
+
–
9 10 11 12 13 14
8
24 MDAT
23 SCK
22 SDIN
21 SDOUT
20 INT
19 RESET
18 VDDP
17 VDDA
16 DTMFOUT
15 OUTDC
14 INDCN
13 INDCP
RIPPLE
8
BIAS
REJECTION
CIRCUIT
7 MUTE
– + – +
AMP1 AMP2
6 OUT2
5 GND