Grundig GDV 100 D Servicehandbuch Seite 104

Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
With the following commands, the Audio deemphasis and Audio mute
can be checked.
Ref. # Command Remark
30a AudioDeemp0On Audio-Deemphasis 0 On
30b AudioDeemp0Off Audio-Deemphasis 0 Off
30a AudioDeemp1On Audio-Deemphasis 1 On
30b AudioDeemp1Off Audio-Deemphasis 1 Off
31a AudioMuteOn Audio-Mute On
31b AudioMuteOff Audio-Mute Off
With the following commands we test if the S2B communication with
the B.E .-Emulator is O.K. and then via the second test the Digital Board
will operate in CDDA transparent mode.
Ref. # Command
20 PapS2bEcho
28 AudioSig
4. LSI-MPEG-Decoder IC7303
Check operating voltages: >3.0V
– IC7303 (VDD1...13, AVCD)
– DRAMs IC7302, IC7304...IC7306 (VCC1...3)
Check ground connections: <0.2V
– IC7303 (GND1...15, GNDA)
– DRAMs IC7302, IC7304...IC7306 (GND1...3)
With the following commands the LSI-MPEG-Decoder can be checked:
Ref. # Command
63 CompLsiAcc
65 CompLsiDramAcc
25 CompLsiDramWrR
5. DVP IC7201
The DVP is located in the same chip as the DSM. This means that the
communication has already been checked.
Check operating voltages VCC1/2 of IC7202 (FIFO): >4.7V
Check ground connections VSS1/2 of IC7202 (FIFO): <0.2V
With the following command the connection to FIFO can be checked:
Ref. # Command
23 CompDvpFifoSig
6. Video
6.1 Video Encoder IC7406
For the next test, the A/V-MUX Board must be connected to the Digital
Board.
Check operating voltages VDD, VAA1...3 of IC7406: >4.75V
Check ground connections GND1...3, GNDA1...7 of IC7406: <0.2V
Check following signals:
Signal Testpoint
Y0...Y7 IC7406-(16...25)
Blank IC7406-(48)
Slave IC7406-(42)
Altador IC7406-(26)
Sleep IC7406-(39)
RGBout IC7406-(14)
4 - 44
Testpoint Level
1400-(3) >4.5V
1400-(3) <0.2V
1400-(4) >4.5V
1400-(4) <0.2V
1400-(11) >4.5V
1400-(11) <-4.0V
Remark
S2B Echo
Audio Signatur
Remark
LSI accesible
LSI DRAM's accesible
LSI DRAM Write Read
Remark
DVP FIFO Signatur
Level
<0.2V
>4.75V
>4.75V
<0.2V
<0.2V
<0.2V
For a correct adjustment of analog video, check the value of R3400 :
150Ω. Check VREF of IC7406-(3): 1.355V ±5%
Generate a colourbar via next software commands:
Ref. # Command
36a VideoColDencOn
36b VideoColDencOff
Check RGB- and CVBS-voltages at following testpoints:
– CVBS: 1400-(17)
– R: 1400-(18)
– G: 1400-(20)
– B: 1400-(21)
6.2 Video Path
To check a large part of the video-path (DSM-LSI-DVP-Denc) a
colorbar can be generated via next commands:
Ref. # Command
37a VideoColDsmOn
37b VideoColDsmOff
To check the videopath with the commands 32...33 a B.E.-Emulator
must be conected to the I2S input.
Ref. # Command
32a VideoSigFullOn
32b VideoSigFullOff
33 VideoSigFullChk
67a VideoSigLsiOn
67b VideoSigLsiOff
With Signature Full On(32a), the following can be measured on the
EURO-AV socket:
Signal EURO-AV contact
CVBS burst
CVBS sync
CVBS white level
CVBS chroma
EURO-AV – blue
EURO-AV – green
EURO-AV – red
The scart-switching voltage can be 0V, 6V, 12V.
Check at connector 1400-(15) the output-voltage while using next
commands:
Ref. # Command
57a VideoScartLo
57b VideoScartMi
57c VideoScartHi
GDV 100 D
Remark
Colourbar DENC On
Colourbar DENC Off
Remark
Colourbar DSM On
Colourbar DSM Off
Remark
Signatur Full On
Signatur Full Off
Signatur Full Check
Signatur LSI On
Signatur LSI Off
Level
±15%
19 300mV
PP
±15%
19 300mV
PP
±15%
19 700mV
PP
±15%
19 450mV
PP
±15%
7 900mV
pp
±15%
11 900mV
PP
±15%
15 900mV
PP
Remark
Output Level 0V ±10%
Output Level 6V ±10%
Output Level 12V ±10%
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