Sony SPP-874, Service Manual, Page: 21 / 38

5-2. BLOCK DIAGRAM — HANDSET SECTION —
– 23 – – 24 –
SPP-874/884
BPF1
1st
MIX
CF2
460kHz
RX
VCO
RX
PLL
LOCAL
OSC
DET EXPANDER
2nd
MIX
BPF101
RF AMP
Q101
KEY
ACTIVE
IC201,202
TX POWER
CONTROL
Q103
RESET
Q404
VOLTAGE
DET
IC404
1st
MIX IN
1st
MIX
OUT
2nd
MIX
IN 2nd
MIX
OUT
CF1
10.7MHz
L3
VCO2 VCO CONT RX OUT
LO1 LO2 TX IN TX OUT RSSI D-COMP OUT
VCO1
X1
10.2MHz
RSSI
TX
PLL
BATT
ALARM
BAT ALM
B+
L4
IF
IN AF
OUT
D-COMP
IN
34
32
27
28
1 47 22 43 44 42 46 3 4
40 38 36
MIX, IF AMP, DET
IC1 (1/3)
MUTE
PRE
AMP
RX
AMP
15 17 18 20
19
PRE
IN RECE
IN EXP
OUT
R02
R01
EXPANDER
IC1 (2/3)
VOLUME
CONTROL
Q1
TX VCO
Q102
INVERTER
Q405
27
46
47
20
18
26
2
23
22
21
24
8
12
28
EN1
WP
SCL
SDA
PUSH
48 EN2
SYSTEM RESET
17 CHARGE IN
25 TX+B CTRL
HOLD
RSSI H/L
RX DATA IN
BATT ALM IN
HICUT MUTE
TX DATA
CLK
DATA
STB
SIG STAGE
VOL CTRL
64
MIC ON/OFF
E,R/W,RS
DB4
|
DB7
5 CLOCK1
6 CLOCK2
53 LCD+B CTRL
1 44
43
42
OUT 0
OUT 1
OUT 2
OUT 3
OUT 4
41
45
BEEP ATT
3 RINGER
39 LIGHTS
40 TALK LED
CTRL
RV1
MUTE
COMPRESSOR
LIMITER DATA LATCH
CONTROL
MIC
IN
FIL
IN
COMP
OUT FIL
OUT
9
6 7 8 5
10 11
COMPRESSOR
IC1 (3/3)
CLK DATA STB SIG OUT
14
SYSTEM CONTROL
IC401
(CHARGE)
CN2
D404
24
23 21
Signal path
: RX (From TEL LINE)
: RX (To TEL LINE)
04
54
|
60
X401
4.048MHz
POWER
CONTROL
Q301
REG
IC301
RINGER DRIVE
Q401,402
LED ON/OFF
Q302
B+
B+
LCD1
LIQUID CRYSTAL
DISPALY PANEL
BZ401
KEY
EEPROM
51
50
49 RETURN 0
RETURN 1
RETURN 2
RETURN 3 52
KEY
KEY MATRIX
S202-221
Q403
B+
D202
S201
(JOG DIAL)
EEPROM
IC402
5
6
7
62
63
61
SDA
SCL
WP
B+ +BTX
D201
MIC401
SP1
SPEAKER
B+
D302-308
B+
D301
TALK
ANT2
TELESCOPIC
ANTENNA
RX VT
RV501
RECHARGEABLE
BATTERY
(BP-T16)
RV101
POWER
LEVEL
RSSI
Hi
L101
TX VT
RX DISCRI