Diagrams; Note For Printed Wiring Boards And Schematic Diagrams - Sony SPP-ID300 Service Manual

4.

DIAGRAMS

4-1. 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.
• : Carbon pattern.
W : indicates side identified with part number.
•
• 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.
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.
• U : B+ Line.
• H : adjustment for repair.
• Power voltages are dc 9 V and fed with regulated dc power
supply from DC IN 9 V jack (J2) on the BASE (MAIN)
board, dc 12 V and fed with regulated dc power supply
from LINE jack (J1) on the BASE (MAIN) board with 100
Ω in series, and dc 3.6 V and fed with regulated dc power
supply from battery jack (J501) 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
• Waveforms
– BASE (MAIN) Board –
1 IC1 #∞ (2LOI)
1.2 Vp-p
98 ns
2 IC2 !¢ (X2) (SPP-ID300)
IC2 %∞ (X2) (SPP-ID400)
2.8 Vp-p
280 ns
– HAND (MAIN) Board –
1 IC504 #∞ (2LOI)
1.2 Vp-p
98 ns
2 IC504 @™ (XIN)
3 Vp-p
238 ns
– 13 –
• IC Block Diagram
IC1 KB8527BQ-2 (BASE (MAIN) Board)
IC504 KB8527BQ-2 (HAND (MAIN) Board)
36 35 34 33 32 31 30 29 28 27
FSK
OSCILLATOR
COMPARATOR
LIMITING
IF AMP
IF AMP
2MI
37
(455kHz)
METER
2nd MIX
1MO 38
DRIVER
1LOI 39
RX QUAD
1LOI VCO DETECTOR
40
CARRIER
VCO 41
DETECTOR
AMP
1st MIX
IF AMP
1MI 42
(10.7MHz)
LOW BATTERY
1MI 43 DETECTOR
REGULATOR
BUFFER
(2.15V)
GND 44
LIMITER
PDR 45
PROGRAMMABLE COUNTER
VREF 46 (RX)
VCC 47
PROGRAMMABLE COUNTER
TIF 48
(TX)
PROGRAMMABLE COUNTER
4_25CNT
(REF)
SPLATTER
FILTER AMP
RX PHASE TX PHASE
fMCU
DETECTOR DETECTOR
1 2
3 4 5 6 7
26 25
REGULATOR
24 VREF
(1V)
PRI
VREF
23 ALC
AMP
+
–
EPI
22
RECTIFIER 21 ERC
SUM AMP
GAIN CELL 20 EO
SUM AMP
+
–
PRI
AMP
GAIN CELL
SPK
AMP
ALC
19 SAI
18 SAO1
RECTIFER
17 SAO2
SPK
16 VCC
AMP
15 GND
COMPANDOR
CONTROL
14 CPI+
MUTE
CPI–
13
8 9 10 11 12
– 14 –