Diagrams; Block Diagram - Base Unit Section - Sony SPP-A941 Service Manual

5-1. BLOCK DIAGRAM – BASE UNIT Section –
ANT1
(ANTENNA)
V REG B+
(RX PWR B+)
+5V 8
BUFFER
RX AUDIO 10
U5 (3/4)
RF1 TX PWR B+
RF UNIT
TX PWR 1
TX AUDIO 2
CAR DET 9
OSC
PLL REF 6
Q4
C15
X1
TX 4MHz
4 7 5 FREQUENCY
26 27
11 EEP/PLL DATA
12 EEP DI
13 EEP/PLL CLK
10 PLL EN
9 EEP CS
3 4 2 1
EEPROM
U3
CA1 4
CA2 5
A1 15
A2 10
U1
7 SEGMENTS B1 13
LED
B2 12
MESSAGE
C1 1
COUNTER
C2 8
D1 3
D2 6
E1 2
E2 7
F1 14
F2 11
G1 16
G2 9
LD4 LD3 LD2
3 2
MAIL BOX
1
• SIGNAL PATH
Ref No. PANEL DESIGNATION Ref No.
: RX
KP0 REC/MEMO KP22
KP1 ERASE KP30
: TX
KP2 ANSWER ON/OFF KP31
: BELL
KP10 MAIL BOX 1 KP40
KP11 2 KP41
KP12 3 KP42
05 KP20 SLOW REPEAT
SECTION 5

DIAGRAMS

COMPRESSOR, EXPANDER,
NOISE GATE
U4
FIL2 FIL2
IN OUT
DE-
2 1
EMPHASIS
LOW-PASS
LOW-PASS
FILTER
FILTER
U5 (4/4)
FIL1 FIL1
DATA/AUDIO
OUT IN
3 4
ADDER
U5 (2/4)
LOW-PASS
TX MUTE
FILTER
Q6
DEVIATION
18 25 16
SYSTEM CONTROLLER
U1 (1/2)
J4
7 SEGMENTS
9
LED DRIVE 7SEG D1
Q9
7 SEGMENTS
10
LED DRIVE 7SEG D2
Q8
15 QA
LED/7 SEGMENTS
LED DRIVER
U10
1 QB
15
A 14
L DATA
2 QC
14
LATCH CLK 12 L CLK
4 QD
13
SHIFT CLK 11
L LATCH
3 QE
2
RESET 10 +3V
5 QF
6 QG
B+ SWITCH
(FOR LEDS)
LD1 G10
ANSWER
ON/OFF
11
LED SEL
3
COL0
PANEL DESIGNATION
QUICK SKIP
COL2
VOLUME – 5
VOLUME +
16
MENU
ROW0
SELECT
TIME SET
ROW4
KEY MATRIX 20
KP0 – 2, 10 – 12, 20, 22,
KP30, 31, 40 – 42
– 17 –
VR1
DEMOD
AUDIO LEVEL
PRE EXP
NF EXPANDER OUT
23 20
CIRCUIT
PREAMP
COMP
OUT COMPRESSOR
+ PRE +
5
CIRCUIT
EMPHASIS
VR2
MOD
6 15 16
DTMF
LOW-PASS FILTER
U5 (1/4)
J1
10
LIFPOUT
24 3 – 8
DTMF1 – DTMF6
17
MIC +
16
MIC –
11
LIFMIN1
18
SPK OUT
4
SP EN
I-TAD 1
HOOK SW
UNIT
5
BU HOOK
3
LINE DC
8
I-TAD RING DET
14
+5V
OFF HOOK 17
RINGER DET 20
TONE/
22 ATE 23
PULSE
SW1
CRADLE DET 19
DIAL MODE
PULSE
SYSTEM CONTROLLER
U1 (2/2)
TONE
21 PAGE
TX ENABLE 15
KP16
HANDSET
LOCATOR
RESET 1
T1
LINE
TRANSFORMER
RIN RO1
BUFFER
+
19 18
Q17
RO1 AMP
MIC
NF
10
MIC AMP
9
MI1
MIC
SP1
SPEAKER AMP
(SPEAKER)
U6
D3
HOOK ON/OFF
DETECT
Q1
V REG B+
CRADLE/CHARGE
DETECT
Q15, 16
V REG B+
(RX PWR B+)
LED2 B+ SWITCH
TX PWR B+ (FOR TX SYSTEM) REGULATOR
CHARGE
Q5
RESET SIGNAL
GENERATOR
Q2, 3
– 18 –
SPP-A941
J7
LINE
U7 D9 – 12
LINE DC RINGER
COMPARATOR DETECT
U2 U8
HOOK ON/OFF
RELAY DRIVE
Q7
LED1
IN USE
LED DRIVE
Q12
+
ATE
CHARGE
+
TERMINAL
–
+5V J8
– +
U9
DC IN 9V