Block Diagram - Handset Section - Sony SPP-A941 Service Manual
Cordless telephone with answering system
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Also See for SPP-A941:
- Operating instructions manual (88 pages) ,
- Service manual (46 pages) ,
- Service schematics (8 pages)
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SPP-A941
5-2.
ANT2
(ANTENNA)
BLOCK DIAGRAM – HANDSET Section –
RX PWR B+
RX PWR
1
BUFFER
RX AUDIO
7
U5 (4/4)
LOW-PASS
TX PWR B+
FILTER
U5 (2/4)
TX PWR
9
TX AUDIO
8
BUFFER
Q1
RF2
RF UNIT
PLL DATA
5
PLL CLK
3
PLL EN
4
OSC
PLL REF
6
Q12
X1
4MHz
C92
TX
FREQUENCY
Ref No.
PANEL DESIGNATION
S1
FLASH TALK
S2
CHANNEL
S3
OFF
S4
1
S5
2 ABC
S6
3 DEF
KEY MATRIX
S7
4 GHI
(SHEET KEY)
S8
5 JKL
S1 – 18
S9
6 MNO
S10
7 PQRS
S11
8 TUV
S12
9 WXYZ
S13
TONE
S14
0 OPER
S15
#
S16
PGM
S17
SPEED DIAL
S18
REDIAL
• SIGNAL PATH
: RX
: TX
: BELL
05
– 19 –
COMPRESSOR, EXPANDER,
NOISE GATE
U7
FIL2
FIL2
PRE
IN
OUT
IN
DE-
EXPANDER
2
1
23
EMPHASIS
CIRCUIT
LOW-PASS
PREAMP
FILTER
FIL1
FIL1
DATA/AUDIO
OUT
IN
+
3
4
ADDER
U5 (3/4)
LOW-PASS
R119
FILTER
MOD
DEVIATION
25
RX DATA
TX DATA
24
MUTE
19
11
PLL DATA
13
PLL CLK
12
PLL EN
BUZZER DRIVE
BEEP
20
Q14, 17
26
OSC2
D5
TALK/BATT LED
17
TALK/BATT LOW
27
OSC1
SYSTEM
CONTROLLER
U3
ATE
21
CRADLE DET
23
MCU PWR B+
V-ANA PWR B+
(FOR ANALOG SYSTEM)
TX ENABLE
15
TX PWR B+
RX PWR B+
RX ENABLE 16
Q20
WATCH DOG TIMER
IRQ
2
COMPARATOR
U5 (1/4)
RESET
1
LOW BATT 22
S19
L (LOW)
VOL
M (MEDIUM)
H (HIGH)
R113
18
DEMOD
AUDIO LEVEL
EXP
ROIN
RO2
OUT
20
19
17
RO1 AMP
RO2 AMP
COMP
MIC
OUT
NF
PRE
COMPRESSOR
+
5
10
EMPHASIS
CIRCUIT
MIC AMP
6
15
16
REGULATOR,
RESET SIGNAL GENERATOR, BATTERY DETECT
U11
OUTPUT
3
REGULATOR
FEED
B+ SWITCH
BACK
ERROR
14
AMP
Q18
SHUT DOWN
MUTE
COMPARATOR
B+ SWITCH
(FOR TX SYSTEM)
Q13
ERROR
DROP OUT
6
DETECT AMP
B+ SWITCH
COMP OUT
(FOR RX SYSTEM)
AUXILLARY
10
Q16
COMPARATOR
1.23V
SWITCHING
Q19
– 20 –
U8
(SPEAKER)
U9
(MIC)
U4
(BUZZER)
ATE
CRADLE
CHARGE
+
DETECT
TERMINAL
Q15
–
D7
INPUT
15
SHUT
DOWN
RECHARGEABLE
5
BATTERY PACK
(BP-T23)
COMP IN
11
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