Diagrams - Sony XR-4890 Service Manual

• IC Block Diagrams – MAIN Board –
IC21 TB2118F (EL)
24 23 22 21 20 19 18 17
+
AMP
VCC
– +
4BIT SWALLOW
REGULATOR COUNTER
SEEK/RECP SEEK/RECP
PRESCALLER
12BIT
PHASE SIG
PROGRAMMABLE
COMPARATOR
COUNTER
40BIT SHIFT
REFERENCE
REGISTER
OSCILLATOR
DIVIDER
18BIT
18BIT
ON/OFF
BUFFER
I/O
SERIAL
INTERFACE PORT
2 3 4 5 6 7 8
1
IC331 TDA7462D
PAUSE
DETECT
INPUT
LOUDNESS
VOLUME
GAIN &
CONTROL CONTROL
SE1L 1
AUTO
CIRCUIT
CIRCUIT
SE1R 2
ZERO
MD+ 3
MD– 4
CDL+ 5
CDL– 6
COMPANDER
CDR– 7
CDR+ 8
PDR 9
PDGND 10
PDL 11
LOUDNESS
SE2L 12
INPUT
CONTROL
SE2R 13 GAIN
CIRCUIT
BEEP
DIGITAL CONTROL CIRCUIT
CREF 14
All manuals and user guides at all-guides.com
SECTION 6

DIAGRAMS

IC351 LB1930M-TLM
VCC 1
NC 2 BUFFER
16 15 14 13
IN1
3
CONTROL
CIRCUIT
IN2 4
VDD
BUFFER
S-GND 5
AMP
+
20BIT
IF COUNTER
22BIT
OUTPUT
PORT
9 10 11 12
TREBLE/
VOICE BANDPASS
SOFT BASS
MUTE
CONTROL
HP LP
CIRCUIT
SUBWOOFER
FADER
LP
SUBWOOFER
OUT
IIC
BUS
– 15 –
IC301 CXA2509AQ-T4
10 NC
30 29 28
OUT1
9
MOTOR
120µ/70µ
DRIVE 8 NC
CIRCUIT
7 OUT2
– +
6 P-GND
PBFB2 31
PBRIN2 32
33 F2
PBREF2
PBFIN2 34
VCT 35
VCT
PBGND 36
37
PBFIN1
PBREF1 38 F1
PBRIN1 39
PBFB1 40
120µ/70µ
2 3
1
IC661 BA3918-V2
28 SE3L
27 SE3R
26 MUTE
25 SDA
24 SCL
23 PAUSE
FRONT
22 OUT FL
FADER
–
+
FRONT
21 OUT FR
FADER
2 3 4 5
1
REAR
20 OUT RL
FADER
IC751 TDA7385
REAR
19 OUT RR
FADER
18 SUBOUT+
17 SUBOUT–
SDA
SCL
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
VDD
16
POWER
SUPPLY
15 GND
27 26 25 24 23 22 21
24dB
T2
+ –
20 MSMODE
NR BIAS
MS
19 DRSW
X1 MODE
TAPE/AUX
18 TAPESW
17 INSW
TAPE EQ
16 NC
FWD/RVS
VCC 15 NC
MS ON/
OFF
+
LPF
+
DETECT
–
14 MSOUT
F3
X1 13 DGND
12 MSTC
G1FB
11
T1
24dB
4 5 6 7 8 9 10
REGULATOR
OVER VOLTAGE
PROTECT
6 7 8 9 10 11 12
– 16 –