GRUNDIG Service
4 - 35
Circuits imprimés et schémas électriques / Layout of PCBs and Circuit Diagrams
Circuit principal II / Family Board II – OSD
not used
POS 2832
3822 are not used
POS 3820, 3821 and
from CO-Unit
from CO-Unit
to/from I/O-Unit
from I/O-Unit
POS 2821
not used
7831 H 6
7830 H 5
7823 G 6
7822 F 6
7821 E 5
7820 D 3
5830 G 5
5822 G 1
5821 B 6
5820 E 2
3834 I 6
3833 I 5
3832 I 5
3831 H 4
3830 H 5
3829 F 6
3828 F 6
3827 F 6
3826 G 5
3825 F 5
3824 F 5
3823 E 5
3822 E 2
3821 E 1
3820 E 1
2832 E 6
2830 H 5
2829 E 6
2828 E 5
2827 C 5
2826 C 6
2825 G 2
2824 E 2
2823 D 2
2822 C 1
2821 C 1
2820 B 1
1820 C 2
4
5
6
1
7
2
3
G
F
E
J
D
C
B
A
I
H
G
F
E
J
D
C
B
A
I
H
4
5
6
1
7
2
3
5DS
5VSWA
5VSWA1
5VSWA1
5D
5D
5D
5VSWA
5VSWA
5VSWA
3827
2k2
3828
330E
3834
10k
3831
1k
3823
4k7
3833
4k7
3832
4k7
3830
1k
3824
4k7
3820
10k
3821
10k
3822
10k
3825
150E
3826
47E
3829
100E
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
2825
100n
2830
120p
2824
33p
2823
18p
2822
47p
2821
18p
2829
68p
2826
100n
2832
10n
7821
BC858B
7823
BC858B
7822
BC848B
7831
BC848B
7830
BC848B
5822
4u7
5830
10u
5820
33u
5821
4u7
2820
7,5-50p
2828
1u
2827
1u
OCS
OCLK
ODAT
SEC-BP
IOFP
VSB
VIDOUT
17,734475MHz
1820
7820
5
9
4
21
22
15
13
14
6
7
23
10
18
20
19
11
8
17
24
12
16
1
2
3
CSYNout
SEPin
CTRL1
CTRL2
Xout
CTRL3
OSCin
SEPout
Xin
RST
VSS1
VDD1
SYNC
SYNin
CS
VDD3
SCLK
CVin
SIN
NC
VDD2
CVout
OSCout
SEPC
LC74780
LC74780
VSS1
NC
VDD2
VDD1
VDD1
DISPLAY POS. COUNTER
MUX
MUX
MUX
DISPLAY RAM
CHARACTER GENERATOR
CHARACTER ROM
MIX
SYNCSEPARATOR
SYNC-AND BACKGR. GEN.
CHECK
OUT
SYNC-PROCESSING
PORT 1
PORT 0
CONTROL-REGISTERS
RESET
BUS-INTERFACE
0SCILLATOR
0SCILLATOR
21
22
23
24
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
7820