Schaltpläne und Druckplattenabbildungen / Circuit Diagrams and Layout of PCBs
Schaltbild Netzteil und Endstufe M 28-C / Circuit Diagram Power Supply and Power Amplifier M 28-C
1
2
3
4
5
MAINS SOCKET
1008
1209
1201
A
5201
17
2
3
4
4,5V
1
T1A
16
1
1
2
N
15
220-240 VAC
10,5V
14
6,5V
13
B
6,5V
12
10,5V
11
5
10
38V
6
9
C
9364
9292
7
8
D
-42V
E
.....V
DC-voltages measured
V
EVM
with low output power
F
G
H
1
2
3
4
5
Bauteile X
Y
2202
D
9
3255
D
4
2204
B
9
5201
A
1
Components
2206
C
8
6201
C
8
2210
D
7
6204
B
8
225
A
11
2211
D
8
6205
B
8
1008
A
4
2212
C
7
6206
G
7
1201
A
3
2216
F
8
6207
F
8
1203
B
6
2251
E
4
6208
G
7
1204
B
6
3202
F
7
6239
D
5
1205
A
6
3203
G
8
6254
D
4
1209
B
1
3204
F
10
7201
F
7
1214
I
11
3239
D
5
7202
G
9
2200
A
8
4 - 61
M 18-C ... M 48-DC
6
7
8
9
10
1205
18V
+C
T2.5A
1
25V
+B2
2
6204
1203
3
T2.5A
1N5392
4
+C
6205
1204
25V
+B1
5
T2.5A
1N5392
2206
6
+A
100n
7
8
+5V6
9
+B2
D5SBA20
36V
10
+B1
+A
6201
To 1207 Power
100n
page 4-62
2211
5,6V REGULATOR
+C
3R3
3204
7201
L7805CV
5,6V
1
3
+5V6
17,2V
Overvoltage
protection
2
0V
7202
BC368
To 1222 Power
page 4-62
1214
1
2
4,5V
3
4
-42V
5
6
Power 4, 170297
6
7
8
9
10
GRUNDIG Service
Schaltpläne und Druckplattenabbildungen / Circuit Diagrams and Layout of PCBs
11
A
0225
18V
B
36V
5,6V
C
25V
25V
D
E
F
G
4,5V
4,5V
NTC
-35V
H
PWDN
11
4 - 62
M 18-C ... M 48-DC
GRUNDIG Service