Block Diagram And Schematic Diagram - Pioneer SCU-2456ZRN Service Manual

1

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM
A
TUNER AMP UNIT
B
FM/AM TUNER UNIT
Q3
CN501 FM RF
FM/AM
25
ANTENNA
26
41 9
FM
34
OSC
6
Q201 Q202
AM RF/AGC
AM
AMTV
OSC
19 20
TUNER PLL
17
IC501
16
LC72146M
24
X501
SCU-2556ZRN ONLY
CN401 6
IC404
AUX-IN
NJM4558MD
AUX IN
CASSETTE
CN651
PLAYER
2 TAPE-L
7
DMUTE
Q405
10
DECK
MUTE
M-CD
PLAYER
CN652
8 BRST
CD-L
5
CN653
DISPLAY
2
4 5
1 3
5 BSET
8
6 7 BINH
6
SWVDD
CN701
2
3
REMIN
IR
RECEIVER
SYSPW
MUTEOUT
BSENS
RESET
ASENS
VDD
VDD2
1
2
T31 Q31 CF51 CF52
CF53
FM MIX FM IF FM IF
FM IF
10
14 15 17 19
FM/AM PROCESSOR
PA4023B
IC1
38 32 36 16 18 23 25
31 30
CF232 AM IF
Q165
AM+B FM+B
TUN+B
15 17 14 13 21 5
AM+B
FM+B
TUN+B
FM LOOP FILTER
14 Q503 Q504
20
19
Q501 Q502
1
AM LOOP FILTER
7
TUNER-L
AUDIO MIX
AUDIO-Lch OUT
IC403 1
NJM4558MD
2
8.4V
REGULATOR
9
TUN+B
4
7
B.U
FM+B IC901
3
AM+B
PA2024A
6
5
VCC
2
SYSPW
Q906
SW+B B.U
SW+B
Q905
Q908 Q904
13
SYSTEM
BRST
CONTROLLER 7
MUTE
IC701(2/2)
8
BSET
PE5157A
23
4
KDT1
BINH
36 25
REMIN KDT2
54
22
KDT0
TELMUT
37 28
KST1
BSENS
35
29
KST2
RESET
38
27
ASENS KST0
14 2
15
PEE
5V REGULATOR/SENSE
IC902 PAJ001A
11
12
MUTESENS B.U
5 13
BSENIN
7
3
RSTIN VDD
6
2 9
ASENIN
4 14
BUPIN
B.U
2
3
SCU-2456ZRN,2556ZRN
T51
Q401 Q403
2
47 1
19
FM PROCESSOR
7
IC2 PA4024A
Q704
33 40 7 43
28
FMSL
9
AMSL
Q508
18
VR501
6 2
RDS HIC
IC502
CWV1065
21
15
20
FMSD
Rch
HEADPHONE
OUT
HEADPHONE-Lch OUT
Q853 Q851
Q855
FIX
MUTE
ELECTRONIC
VOLUME CONTROL
19
FL
Lch
OUT
5
ZCINL
IC751
PMJ002A
RL
OUT
20
VDT/VCK/VST
SOFT MUTE
Q553
RL
FL
Q703
MUTE
MUTE
POWER AMP
RLOUT+
IC551
15
RLIN RLOUT-
FLIN FLOUT-
11
FLOUT+
STBY MUTE
22
4
SYSPW
ACCMUT
Q555
MUTE
ACC
TELMUTE
3
4
SYSTEM
CONTROLLER
IC701(1/2)
34
PE5157A
TMUTE
1
47 52
VDD2
SL
FMSD
SWVDD
CN852
2
HEADPHONE
3
TRANSMITTER
1
Lch
CN851
Lch OUTPUT
TRANSMITTER
5
5
Lch INPUT
INTERFACE
1
1
SIGNAL GND
3 3
VCC (8.5V)
7
7
VCC
FRONT Lch FIX EQUALIZER
3
1 3
IC201
IC202
NJM4558MD NJM4558MD
2
Q203
Q201
253Hz 117Hz
Q205
5.4kHz
REAR Lch FIX EQUALIZER
3 1
3
IC251 IC252
NJM4558MD NJM4558MD
Q251 Q253
141Hz 250Hz
Q255
1.45kHz
Q551
RL-OUT
FL-OUT
BUP1
26
FUSE 10A
IN1
KDT1 BUP2
25
L5
KDT2
24
IN0
KDT0
23
L1
KST1
22
IN2
KST2
21
L0
KST0
20
GND
19
18
CONC CONB CONA
17
15
RL-
19 16
RL+
7 14
FL-
9 13
FL+
ACC
Q702
4
A
42
X1
41
X2
X701
Q705
VDD
SWITCH
B
1
1
C
27
28
B.U
D
9