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