Sony SPP-935 - 900 Mhz Cordless Phone, Service Manual

Page: 18 / 43

SPP-935
– 19 – – 20 –
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM – BASE UNIT Section –
MIX
Q7
RF AMP
Q2
IF AMP
Q6
IF AMP
Q27
BUFFER
U5 (2/3)
SPEAKER AMP
U14
GAIN CONTROL
Q25
PLL REFERENCE
SWTCH
Q14
KEY MATRIX
SW1-19, 21, 22
B.P.F.
B.P.F.
5
6
7
1
4
15
12
11
14
4
5
6
7
15
1
14
11
12
9
10
11
12
14
7
6
2
3
33
25
13
22 21
7 8 9
5 8 10 14
13
21
12
10 11
14
6
3
5
24 7 34 26 23 18
4
29
2
30
37
31
44
36
1
5
27
20
13
14
19
4 1 2
7
8
11
RF AMP
Q4
ANT1
F2
F3
F4
IF AMP
IF
IN
IF
OUT
F5
LIMITER
AMP
DMOD
OD CL
CAR DET
IF AMP, LIMITER AMP, MIX
U1
CK
DATA
STB
XIN
PLL CLK
PLL DATA
PLL EN
CP2
CP1
PLL REF
F1
Q13
6 16
5 4 3
FILTER
AMP
FIL1
OUT
FIL1
IN
IN2
AMP
MIC
AMP
COMP
OUT
COMP
MUTE
IN2
MIC
NF
COMPRESSOR, NOISE GATE
U6 (2/2)
SPK MUTE
MIC MUTE
MUT
SP1
U20
MIC AMP
MCI
MCO TXI TXO
ATTENUATOR
RXI
RXO
ATTENUATOR
VLC
HYBRID
AMP
HTI
HT+
Q5
Q6
Q7
Q1
Q4
Q0
TX DATA
SPK MUTE
MIC MUTE
TX ENABLE
SPK MUTE
MIC MUTE
DO
EEPROM CS
PLL DATA
PLL CLK
PLL EN
OSC2
PLL DATA
PLL CLK
PLL EN
PLL REF
LATCH1
LATCH2
DTMF EN
RINGER SW
CS CLK DI DO
RCLK
SCLK
SER
Q4
Q5
Q6
Q7
Q0
Q1
SER
SCLK
RCLK
D0
D1
D2
D3
TONE OUT
OSC OUT
OSC IN
TEN
SHIFT REGISTOR & LATCH
U15
SHIFT REGISTOR & LATCH
U16
DTMF TONE GENERATOR
U17
X2
3.58MHz
INTERCOM
D3
SPEAKERPHONE
D4
CHANGE
D5
RINGER LEVEL
S1
OFF LOW HIGH
B+
3
EEPROM
U4
OSC1
POW0-5
TX MUTE
RINGER
SP SWITCH
CAR DET
TONE/PLUSE
42
8
ı
12
X1
4MHz
DIAL MODE
S2
TONE PULSE
SYSTEM CONTROLLER
U3
OFF HOOK
LINE DROP
RING DET
ATE IO
CRADLE DET
RESET
HS ON
RX DATA
RX MUTE
TEL SWITCH
10
RX VCO
Q9, 10
TX AMP
Q1
TX VCO
Q8, 11
BUFFER
U5 (3/3)
AF AMP
U18 (2/3)
CRADLE DETECT
Q18, 23
LED DRIVE
Q12
CHARGE ON
SWITCH
Q15, 16, 24, 26
RESET SIGNAL
GENERATOR
U10
+5V REGULATOR
U9
OFF HOOK DETECT
U7
TELEPHONE LINE
DETECT
U11, Q20-22
RINGER DETECT
U8
U13 (1/3)
PLL
U2
21
35
28
15
41
6
BUFFER
Q17
AF AMP
U18 (1/3)
AF AMP
U18 (3/3)
PRE/SUM
AMP
FILTER
AMP
FIL2
IN
FIL2
OUT PRE
IN
EXP
OUT
2 1 23
15
20
EXP MUTE
+
–
ATE
CHARGE
TERMINAL
EXPANDER, NIOSE GATE
U6 (1/2)
U13 (2/3)
B+
T1
IN USE
D7 POWER
D6
LINE
J7
+ –
DC IN 9V
J8
U13 (3/3)
LOW-PASS
FILTER
U5 (1/3)
3
1
2
4
VOICE SPEAKERPHONE
U12
LIM
IN
: TX (INTERCOM)
: RX (INTERCOM)
• SIGNAL PATH
: TX (TELEPHONE)
: RX (TELEPHONE)
: BELL
QUAD-TUNE
VOLTAGE
C151
05
SAW
FILTER