Sharp HT-DP2500W Service Manual page 22

HT-DP2500W
A
C250
0.001
C253
0.018
C254
0.018
B
C248
0.0047
TP301
C241
680P
C
C236
0.022
C237
3.3/50
C226
33P
R224
8.2K
D
FM
MUTE
VR201
LEVEL
10K(B)
C225
0.022
C220
0.022
C219
0.047
C218
E
8P
AM
AM BAND
TRAKING
COVERAGE
F
C215
0.022
FM BAND
COVERAGE
G
BAND
3
PASS
2
FILTER
D202
1
1N4148
D201
1N4148
AM_ANT FM_ANT
H
AM
GND FM 75ohms
SOC201 ANTENNA TERMINAL
NOTES ON SCHEMATIC DIAGRAM can be found on page 9.
1
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Q202
0V
1
FM ST:4.6V
KRC104 M
FM/AM:0V
0V
2 3
C255
R229
2.7K MUTING 0.022
FM IF DET./FM MPX./AM IF
IC203
R228
R230
C245
3.9K
2.7K
LA1833 1/50
AM:( )
C252
12
AM/FM
1/50
1.8V R221
2.15V
13
L CH
(2.15V)
(1.8V) 3.3K
1.7V
14
R CH
(1.7V)
3.53V
11
PHASE
C247 (3.53V)
2.0V
0.1 (2.0V)
R253
R223 2.1V
68K
470K (2.1V)
IF 0V
16 MPX-IN 10
OUT (0V)
R217
C243 4.9V
J202
(4.9V)
22K
1/50 15K
C244
17 VCC 9
56P
2.0V
C242
R220
(2.0V)
10/16
270
FM
FM
18 8
OUT DET
2.6V
C246
2.8V C230
R251
(2.6V)
0.0039
(2.8V)
0.022
22K
AM
19 7
STEREO
OUT
0V
5.0V
C240
(0V)
0.1 (5.0V)
C239
20 SD 6
VSM
10/16
0.4V 5.0V
(0.4V) (5.0V)
C238
GND 5
0.022
0V(0V)
AM
AM RF
21 4
IF
IN
R219
2.0V
2.4V(2.4V)
1K
(2.0V)
FM
22
2.4V(2.4V) AFC
3.1V
C228
(2.1V)
0.1
AM
C235
REQ
23 3
0.022 OSC IN
4.9V(4.9V)
AM
4.9V
AM
24 2
MIX
(4.9V)
3.4V(3.4V)
OSC OUT
1
FM IF
L205 IN
1mH
R218
5.6K
R216
4.7K TP302
C223 FM IF
470P
CF201
2
C222
1
Q281
18P (CH)
2SC535 C
0V
IF AMP.
R214
68K
4.8V
R285
(0V)
33
6.8V
(0V)
R282
470
R283
330
C281
0.022
C285
C224
0.01
0.022
R208
C212
C214
10K
22P
10/16
L202
T202
R206
9
10
8
3.8V
C209
C210
7
3.1V 15P
33P
6
3.8V
5
VD203
1.5V R203
4 C216
KDV147C
33K
4.7P
3
3.8V
R202
C202
2
0.01
100K
1.6V L201
R201
1
FM RF 22
0.8V C204
7P
D205
1N4148
FM SIGNAL
AM SIGNAL
2 3
Figure 18 SCHEMATIC DIAGRAM (7/7)
CNS201
C234
0.22/50
C233
1/50
R236
10K
C231
22P
C275
100/10
C276
R249
0.022
47K
CF202
FM IF
R248
1K
R237
C229
5.6K
0.022
AM IF
CF203
ZD201
R250
3
MTZJ5.1B
2
5.6K
1
R243
11V
5.6K
R245
5.6K
10.5V
T204 L204
(0V)
100µH
C249
R244
L203
10/16 330
100µH
R231
10K
C263
0.022
C266
330P
C271
C260
12 IO1
IF IN
220/16
1/50 0V
3.5V 13 IO2
BO4
C265
0V
14
0.01
C274 C267
0V(2.6V)
15 AM IN BO2
0.022 0.022
2.6V(0V)
16 FM IN BO1
5.2V
R240
R238
C269
17 VDD
10K 2.2K
0.001
C270
18 PD
1/50
0.9V
A IN
19
0.9V
R239
20 A OUT
1.5K
21
VSS
2.6V
22 X OUT X IN
R210
4.7K
IC202
LC72131
PLL
CONTROLLER
C213
0V
100P
(0.2V)
0V
X202
R205
R299 C261
(0V) 4.5MHz
680 47 12P
R204
47K 1.0V
(0V)
( ) : AM
Q201
2SC535 C
C207
FM IF AMP.
0.001
C206
0.022
C203
0.0047
C205
0.0047
C227
0.022
4
– 18 –
TO MAIN PWB P12 2-A
CNP201
9 10 11 12
C273
100/10
C272
0.022
C268
47/16
R242
5.6K
0V
11
0V
10
3.9V
FM
9
8
7 R232
5.1V 1K
DO 6
R233
4.8V
CL 5
1K
R234
0.1V
DI 4
1K
0.1V
3
CE
R235
0V
2
1K
2.6V
1
C262
15P
C264
0.001
TUNER PWB-B
5 6