Each precaution in this manual should be followed during servicing. Components identified with the IEC symbol
components in which safety and performance can be of special significance. When replacing a component identified by
with the same ratings of resistance, 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.
- 40 -
XF222
9.6
0
1.7
0
XF231
0V-TP1
5.8
2.3
2.3
6.8
1
2
3
FM IF
AM MIX
REG
AM IF
IC231
0V-TP2
OSC BU
AM OSC
AFC
AM RF
24
23
22
4.4
5.8
2.3
2.3
5.3
6.8
R2153
100K
C2151
12P
R2303
4.7K
0
2.8
C2505
100;16
C2512
C2506
C2504
27P
1000P
0.01
0
2.4
2.4
0
0
0
3.0
0
2.4
0
0
4.9
4.9
0
12
11
10
9
8
7
6
5
4
3
XOUT
T5
T4
T3
T2
T1
CIN
FLOUT
Vssa
Vdda
IC251
LC72722
XIN
Vddd
Vssd
T6
T7
SYNC
RDS-IN
DO
CL
DI
13
14
15
16
17
18
19
20
21
22
2.4
0.4
0
4.9
0
0
0
0
0
4.2
0.2
0.2
C2513
C2515
22P
0.01
C2516
100;16
R2519
10K
PRODUCT SAFETY NOTICE
and
mark in the parts list and the schematic diagram designated
! ! !
! ! !
and
0
6.1
Q2310
KTC3875
0
R2331 C2332
47K
0.01
C2306
R2306
1
2.7K
C2322
XF233
1000P
C2321
C2305
0.47
1
5.8
5.8
4.7
2.3
0
0
4.3
6.8
6.8
0
0.7
4.8
5.8
4
5
6
7
8
9
10
11
12
GND
SD
ST
FM DET
VDD
MUTE
FM/AM
MONO
LA1844ML
AM
FM
PILOT
AGC
DET OUT
DET OUT
PLL IN
MPX IN
CLL OUT
RCH
LCH
21
20
19
18
17
16
15
14
13
C2319
4.2
2.0
2.9
2.0
2.3
2.2
3.2
3.2
0.033
2.2
0
0.7
C2317
4.7;50
C2320
0.033
C2307
R2308
10;50
22K
C2308
R2309
0.018
39K
R2712
100K
2.4
2.4
0
0
R2812
2
1
100K
L2503
MPXIN
VREF
270U
R2901
100
CE
SYR
23
24
0.2
0
0
+12V
5.6V
HP-MUT
D2451
1SS355
R2464
1K
R2461
1K
R2462
1K
R2463
1K
, use only the replacement parts designated, or parts