Sanyo DC-BM300 Service Manual page 20

SCHEMATIC DIAGRAM (AMPLIFIER)
R4703
22K
C4703
560P
24 23 22 21 20 19 18 17
R R R ALC R R
NC NC RECOUT ALC
PBNF PBEQ PBOUT LOWCUT RECIN
IC440 AN7348K
CN440
L-CH
R L L L L L L
IN IN PBNF PBEQ PBOUT RECIN RECOUT
R/P
HEAD 1 2 3 4 5 6 7 8
C4805
100P
R-CH
E HEAD
R4803
22K
C4803
560P
R4607
R4606
Q4603
C4600
KTC3198
1/50 IC443 BA7755A
1 2 3 4 5
R4602
100
L4602
Q4601 BEAD
REC
KRC107M
R4750
12K
AUX_L
CN450
R4850 12K
AUX_R
+5.6V +5.6V
A_GND
TU-R TU_R
TU-L TU_L
+8.5V +8.5V
TU-DO
TU_DO
TU-CE TU_CE
TU-DI TU_DI
TU-CLK D_CLK
GND
5 4 3 2 1
This is a basic schematic diagram.
R4820 1K
R4821 47K
CD_R
R4822 4.7K
TU_R
R4823 39K
AUX_R
R4825 220K
Q4700
KRC107
R4963
100
+8.5V
15 14 13 12 11
16 15 14 13
NC TA CD TU AU
NC NC VCC
IC441
REC/PB RIPPLE
B PB GND
SW FILTER
NC TA CD TU AU
9 10 11 12
16 17 18 19 20
R4720
1K
R4721 47K
CD_L
R4722 4.7K
TU_L
R4723 39K
Q4800
AUX_L
KRC107
R4725 220K
22K
R4553
33
39K
Q4961
MPSA56
R4605
1K
BEAT
Q4602
KTC3198
+8.5V
R4560
4.7K
R4400 390
10K R4406
R4402
15K
10 9 8 7 6 5 4 3 2 1
- 22 -
R4922
TU_DO
1K
C4833 VF_CE
1/50
R4923
1K
10 9 8 7 6 5 4 3 2 1
R R R R R R
TEST VSS CE DI
SELO VRIN TRE BASS1 BASS2 OUT
LC75342
L L L L L L
NC Vref VDD CL
SELO VRIN TRE BASS1 BASS2 OUT
21 22 23 24 25 26 27 28 29 30
+8.5V
1/50
C4733 100
R4962
D_CLK
1K
R4921
R4324
1K
+5.6V
D4321 D4320
1SS133 MTZJ3.9B
6.2
Q4321 Q4320 R4321
10K
KTA1266 KTA1266
V_CHK
1K 1SS133 1SS133 1SS133
R4342 D4344 D4343 D4342
-28V
Q4346
Q4345 R4345
KRC107M 4.7K MPSA56
47K
R4346
D4348
MTZJ5.1
Each precaution in this manual should be followed during servicing. Components identified with the IEC symbol
parts list and the schematic diagram designated components in which safety can be of special significance. When replacing
a component identified by
wattage or voltage that are designated in the parts list in this manual. Leakage-current or resistance measurements must
be made to determine that exposed parts are acceptably insulated from the supply circuit before returning the product to
the customer.
TDA7265
IC442
L-OUT
R-OUT
0V 26.0V
15.3V
-VS +VS R-IN R-NF 0V L-NF
0V 0V MUT/ST-BY L-IN 0V
-VS
0V 0V 0V
1 2 3 4 5 6 7 8 9 10 11
C4841 R4500 C4741
100P 1K 100P
R4501
1K
C4832 R4840
10/50 3.9K
C4732 R4740
10/50 3.9K
Q4502
KRC107
MUTE
Q4501
KRA107M
Q4990
KTD2058
PR495
+12V
800mA
IC446 12.6
NJM78L05A
1 2 3
R4994
4.7K
+5.6V
C4991
220/16
D4991 C4990
MTZJ13B 0.022
D4994
RL153
Q4991
KTD2058
PR496
+8.5V
1000mA
9.1
R4992
Q4992 820
KTA1271
R4993
820
Q4994
KRC107M
FU421
T4A L 250V
PT420
CN416
CN415
PR420
2500mA
D4284
RL153
CN441 CN420
C4284 0.01
PRODUCT SAFETY NOTICE
! ! ! , use only the replacement parts designated, or parts with the same ratings of resistance,
- 23 -
L4881 L4781
R4881
390
R4781
390
HEAD PHONE
CN455
RIGHT
WOOFER
SP471
CN457
L-CH
SP481
R-CH
CN456
LEFT
WOOFER
CN412 BL
AC INPUT
CN411 BW
230V/50Hz
! ! ! in the