Grundig M 28-C Servicehandbuch Seite 41

M 18-C ... M 48-DC
Schaltplan Tuner / Circuit Diagram Tuner
1 2 3 4 5
A
0,5V
B
+12V
+FM
FM FRONTEND
3102
220k
2102
3103
µ
47
C
6 3
+B AGC
1110
D
A
1102
1
FM
ANT.
Ant1
F
a
E
F o
4
GND
F F = F + F i
o a f
MT VT
MT 5
3104
G
1103
2
1
H
AM-FRAME SOCKET
I
B
5102 6
LW = 0,7V
MW = 0V
2
6105
3108
HN1V02H
7104
2k2 5
BC338-40
1
MW
3
J
2106
5p2-
30p
1 4
K
7105
BC338-40
3109
3
2k2
2
2108 2109
82p 27p
5103
L
3169
LW
1
0E
V
M
0V
N
1 2 3 4 5
GRUNDIG Service
Schaltpläne und Druckplattenabbildungen / Circuit Diagrams and Layout of PCBs
6 7 8 9 10
5109
3172 10,7 MHz
0E
3173
3107
2150
3181
100n
5110
+7V 10,7 MHz
7
+6V
+8V
IF Out
VCC1 VDD
7 23 35 1,4V 34 33 1,4V 38
VCC1 VDD FM-IF2 V Stab B FM-IF2I V Stab A
STABILIZER
F 10,7 MHz
if
37 FM-IF1I In FM FM
IF1 IF2
Osc Out 8 5 FM Osc.
3140
CHARGE
PUMP
6
AM
FRONTEND
VT 8 I-Tune
AM
MIXER
AM
OSC.
2 AM-RF
C
Ripple AM-Osc. FM GND RF GND IF GND
2V 1 6 3 4
3184
2129
1 µ
3123
6105
HN1V02H
7 6 5
2 3
3132
3163
2107
470n
MW-OSC
3124
5123 3129
3 4
+7V
2120 2
+6V
3130
33p VDD
1 6
2125
3134
560p
LW = 0V
LW-OSC
MW = 0,7V 3197
7124 7122 LW = 0,7V
5122
MW = 0V
BC848C 3 4 BC848C
3137 3128
10k 2k2 7109
2
2123
BC858B
390p
3131
1 6
V
2122
0V
3n9
MW LW
MW LW
6 7 8 9 10
M 18-C ... M 48-DC
11 12 13 14 15
IF - AM IF - AM
AM - DET
3
6
1 1 6
2
2
3192
3 4 3 4
2 1
5111 5112 5114 1
450 kHz 450 kHz 450 kHz 2140
470n
40 41 36 32 19 20
AM-MIX Out AM-IF1 In AM-IF2 AM-AFC AFC- AFC+
AFC
AM AM
IF DET
CONTROL
FM
DET
XTAL
AGC
OSC
Fieldstrength
Dig. GND RF GND FM-Demod AGC AF-Out Indc.
17 26 42 18 0V 44 10 2V 21 25
2141
100n
3191 3183
2128
3162
µ
10
5120
10,7 MHz
2161
3185
1n
10,7 MHz
75 kHz
4
7
3 2
V
0V
MW LW
3125
10k
.....V FM mode stereo
.....V FM
.....V AM
11 12 13 14 15
4 - 9 GRUNDIG Service
Schaltpläne und Druckplattenabbildungen / Circuit Diagrams and Layout of PCBs
16 17 18 19 20
V
0 0V = No communication
During communication
152kHz, 50mV pp
4V V
0V
0
7101 +9,6V
stereo mono stereo
VCC2 High = During communication
TEA5762
22
VCC2
1,3V
3161
29
WRITE Enable
470E
3160
28
DATA
470E
3159
27
CLOCK
470E
6120 3158
31
P1
470E
1N4148
39 2145 2147 2148
FM/AM
220p 220p 220p
3 STEREO = LOW
P0 30
Mono/
Stereo 24
2135 3152
Left 14
470E
220n
2134
Mute 13
15n
0,7V
STEREO 2133 4
DECODER µ
1
2137 3153
Right 15
470E
220n
2136
PILOT 16
15n
Filter 0,9V
2138
11,8V
µ
2 2
MPX-In VC0 LPF
11,2V
3150
11 1V 9 0,8V 12
4k7
V
2162
2127
3151
22
220n
0V
AM FM
2160
3141 3145
0,5V
12p
2131
+FM
+12V 7110
470n
BC858B
5121 2132
3164
3142
75 kHz
470n
3167
VCC1
220E
+8V
VC0
2130
3154
22n
5115 3155
+7V
VDD 330E
6
+6V
+8V 2144
VCC1 µ
ANTI BIRDY 1
FILTER
VCC2
3143
1 7103
+9,6V
BC858C 3144
6107
1,3V
1k
3186
BZX79/
2142 2143
C11
1k
100n 220n
3146
2158
100n
Signal path
FM
AM
AF
16 17 18 19 20
Bauteile X Y
Components
1102 D 1
1103 G 2
21
1110 D 4
1121 C 21
1124 F 21
2102 C 2
2106 J 4
A
2107 J 6
2108 L 3
2109 L 3
2120 K 7
2122 M 7
2123 L 7
2125 L 7
2127 H 16
B
2128 I 13
2129 I 8
2130 J 20
2131 I 17
To 24 Front 2132 I 17
2133 G 18
page 4-13
2134 G 19
page 4-19
C 2135 F 19
2136 H 19
1121 2137 G 19
2138 H 18
2140 C 14
1
GND
2141 H 15
2142 K 19
2
2143 K 20
RDS
D
2144 K 20
3
ENABLE 2145 E 19
2147 E 19
4
2148 E 20
DATA
2150 C 6
5
2158 L 18
CLOCK
2160 I 15
E 2161 I 15
6
STEREO
2162 H 20
3102 B 2
3103 C 3
3104 G 4
3107 C 6
3108 J 2
3109 K 2
F
1124 3123 I 6
3124 K 7
1 3125 L 10
LEFT
3128 L 9
3129 K 9
3130 K 9
2
GND 3131 M 10
G 3132 J 7
3134 L 6
3 3137 L 6
RIGHT
3140 F 7
3141 I 16
3142 I 16
3143 K 17
3144 K 17
H
3145 I 17
3146 L 20
3150 H 19
3151 I 20
µ
3152 F 20
3153 G 20
3154 J 20
3155 J 20
I
3158 E 20
3159 E 20
3160 D 20
4 3161 D 20
VCC
+12V 3162 I 15
3163 J 9
3164 I 20
J
3167 I 20
To 52 AF 3169 L 5
3172 B 6
page 4-45
3173 B 6
page 4-49
3181 C 7
3183 I 13
3184 I 8
3185 I 13
K
3186 K 16
3188 M 20
3191 I 12
3192 C 12
3197 L 10
5102 I 3
5103 L 4
L 5109 B 6
5110 C 9
5111 C 11
5112 C 12
5114 C 13
5115 J 15
5120 I 12
5121 I 15
M
5122 L 8
5123 K 8
6105 I 5
6105 I 6
6107 K 20
6120 E 18
7101 C 16
7103 K 17
N
7104 J 2
7105 K 2
7109 L 10
9533
7110 I 19
21 7122 L 9
7124 L 6
4 - 10