Sharp CD-BA250H Service Manual page 30

CD-BA250H/CD-BA2600H
A
FM FRONT END
B
C
D
E
A+10 V
34
GND(A_GND)
32
TUN_SM
26
TUN_R
31
TUN_L
33
DI
30
CE
28
DO
27
F
CLK
29
GND(D_GND)
35
RDS_RST
25
RDS_RDDA
24
RDS_RDCL
23
RDS_READY
22
G
MAIN PWB-A1(3/3)
H
• NOTES ON SCHEMATIC DIAGRAM can be found on page 39.
1
S0302
FM ANTENNA
TERMINAL
FE301
C301
0.01
ANT 8
GND 7
GND
6
R369 15
+B
VCC 5
C321 100/16
L342
C345 0.022
2.2µH
R345 4.7K
VT 4
F OUT 3
GND 2
C347 0.022
C341
R344 470
0.022
1
IF OUT 1 2
R346
CF301
330
3
R347 R348 680
6.8K
R349
33
Q301
2SC380 O
+B
+B
C384
0.001
C381
C382
12P(CH)
15P(CH)
X352
4.5MHz
IC302
1 X IN X OUT
LC72131
VSS
2
PLL(TUNER)
AOUT
R374 1K
3 CE
R373 1K
4
DI
R372 1K
5
CL
AIN
R378 1K
6
DO PD
7 FM/AM
VDD
FM IN
IF
8
CONT
AM IN
9
FM/AM
10 MO/ST SD
IF IN
11
ST IND
C386
R376
R386
330P
1K
22K
R360
4.7K
+B
R359
+B
1.8K
+B
KTA1266 GR
R384
5.6K
C391
47/25
R383
+B 5.6K
R370 1K
FM SIGNAL
AM SIGNAL
2 3
Figure 30 SCHEMATIC DIAGRAM (9/9)
CT1 0.01
TP301
CF302
2
+B
R382
150
C397
0.022
22
C352 10/50
R381
21
10K
20
C393
C394 C350 0.022
1/50 47/16
R380
1.5K
C392
R379
19
0.001
2.2K
18
C380
10/50
17
C387
16
0.022 2
15
CF352
L351
C385
14
100µH
0.01
13
C353 0.022
R377 47K
R393
12
1K
C354 0.022
CF351
C399
0.022
C356
C398
0.001
100/10
R387 5.6K
R388
3.9K
C355
22P
C370
1/50
Q360
R385
5.6K
R391
270
+B
Q360: SWITCHING
RT30 1K
ZDT21
DZ5.1BSB
LT21
2.2µH
CT24
47/16
RT22
390
+B
RT23
LT22
390
2.2µH
4
– 30 –
AM LOOP
ANTENNA
2 1
2 1
CNP302
L341
BALUN
T306
AM
OSC.
AM BAND
COVERAGE fL
C335
560P
C334
22P(CH)
R323
68K
VD301
KDV147B
R336
10K
1
3
C342
0.022
R351 5.6K
R358
3.9K
R365
10K
1 24
FM IF IN AM OSC OUT
C362
3.3/50
AM OSC IN
23
2
AM MIX OUT
C361
22
FM AFC
0.022
3 REG
T351
AM RF IN 21
AM IF C363 0.022
C364 2.2/50
1
R352
VSM 20
1K
3 C365 0.022
4 AM IF IN AM LOW CUT
19
C366 0.001
FM/AM OUT 18
5
GND
R350
6
SD
2.7K
C367
1/50
L354
7 STEREO
LOW PASS
FILTER
8 FM DET
R353
X351
270
456KHz
17
MPX VCO
9 VCC
16
MPX IN
R356 R357
10 IF OUT C368
1K 470K
1/50
11 PHASE
C369 27P C374 0.018
15
R-CH OUT
R355
14
L-CH OUT
3.3K
PHASE
12
C372 C371
13
(FM/AM) MO/ST
1/50 1/50
IC303
R364
LA1832S
47K
FM IF DET./FM MPX./AM IF
R363
47K
CT21
47/16
ICT21
RT21
LC72723M
10K
CT22
RDS DECORDER
0.022
RT27
1K
CT23
22P(CH)
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
CT25
22P
(CH)
CT26
560P
RT25
RT24
10K
56K
CT29
CT31
0.022
RT26
47/16
56K
5
C338
0.001
C323
0.022
C330
15P
TP302
C373
0.018
6