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GRUNDIG Service
Hauptplatte / Main Board – Audio
M1
SSPOUT1
M1
SSPCLK1
M1
DACCS
PCMCLK
33R
M1
PCMCLK
RP4
1
8
ACLK
2
7
M1
ACLK
AOUT3
3
6
M1
AOUT3
LRCLK
4
5
M1
LRCLK
V3.3
VAADAC
C352
C353
0.1uF
0.1uF
V3.3
M1,2,3,4,5,7
V3.3
V5.0
M1,2,3,6
V5.0
Reference
Block Diagrams .......... 3-2
Oscillograms .............. 3-3
Connection Overview 3-5
DOWNMIX
Main Board
– M1 ............................. 3-8
– M2 ............................ 3-9
– M3 ........................... 3-10
SL
– M4 ........................... 3-10
– M5 ........................... 3-11
– M6 ........................... 3-12
– M7 ........................... 3-13
Power Supply ............. 3-15
Keyboard Control ....... 3-17
28
SPDIF Electrical Interface
M1
SPDIFR
SPDIF Optical Interface
AUDIO MUTING CIRCUIT
M1,3,7
SRST-
V3.3
R84
10K
AUDIOMUTE
M1
AUDIOMUTE
R86
10K
(M5)
2 Channel ONLY
20 21 22
23
24
U30
14
1
16
BCK
SCK
2
15
DATA
ML
3
14
15
LRCK
MC
4
13
DGND
MD
5
12
VDD
ZEROL
6
11
VCC
ZEROR
7
10
VOUTL
VCOM
8
9
VOUTR
AGND
C20
10uF
PCM1748KE
6.3V
25
C47
1nF
R53
C45
R55
R54
4.75K 1%
SR
1.78K 1%
7.50K 1%
47uF
16V
R56
C48
10K
680pF
RIGHT
26
LEFT
-12VF
C40
R45
R44
1.78K 1%
7.50K 1%
C42
47uF
16V
0.1uF
R46
C41
10K
680pF
R43
C37
4.75K 1%
1nF
13
12
10
5VA
D2
1
2
MUTEVCC
R64
1N4148
22R
C54
470uF
10V
D3
SRST-
2
1
1N4148
AUDIOMUTE-
3
2
1
Q9
BC547C
R85
10K
Analog Power Supply Input
L5
5VA
100uH
5VA
M1
5VA
C55
C50
470uF
0.1uF
10V
L10
100uH
+12V
M1,6
+12V
C56
C52
220uF
R66
0.1uF
16V
1.5K
L8
100uH
-12V
M1
-12V
C60
C130
R67
0.1uF
220uF
1.5K
16V
C5
C46
100pF
0.1uF
R50
4.75K 1%
R58
C44
10K
47uF NP
10V
2
1
3
R52
680R
U3
27
C38
LM833M
47uF NP
R48
10V
6
680R
7
5
R42
+12VF
V-
V+
10K
R49
4.75K 1%
C35
0.1uF
C36 100pF
Electrical
U26D
SPDIF
Connection
+
11
-
74ACT125
29
U26C
+
R4
9
8
22R
-
74ACT125
C179
R144
47uF
330R
16V
R62
22R
Q7
Q8
R61
R63
BC557B
BC557B
1K
100K
+4.6V
5VALOW
-12VF
R60
R59
1.5K
1K
R65
C49
10K
100pF
3 - 11
Xenaro – GDP 42...
VAADAC
C103
470uF
10V
+12VF
C113
C112
220uF
0.1uF
16V
-12VF
C106
C90
220uF
0.1uF
16V
SCARTAUDIOR
M6
R57
SCARTAUDIOL
M6
4.7K
3
J3
2
1
Q6
BC547C
L
1
R51
330R
C43
1nF
2
R
R47
GND
3
330R
CONN RCA STEREO COMMON G ND
C39
BC547C
1nF
Q5
3
2
1
AUDIO SIGNAL
OUTPUT
DownMix Left
R41
SPDIF
DownMix Right
4.7K
J4
C3
FB1
R3
R2
SIG
1
270R
0.1uF
75R 1%
GND
2
TOP VIEW
R1
C2
C1
91R
100pF
100pF
CONN RCA MONO NO CHASSIS
GND
V5.0
3
C4 0.1uF
VCC
DRIVER
2
IC
VIN
1
C177
Fiber Optic
TOP VIEW
22pF
TX Module
M5
TOP VIEW
SPDIF IR TX
J5
Optical
SPDIF
Connector
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