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GB 30
5.
DVD612 /XX1
5.7
Test Instruction Audio/Video Board
These test instructions can be used for all versions of the A/
V board which has the following outputs:
•
Audio L/R
•
5.1 Audio output
•
Subwoofer output
•
Optical / Coaxial digital output
•
CVBS
•
Y/G_vid,U/B_vid,V/R_vid output
•
S-video
•
Scart output
5.7.1
General
•
All the waveforms measurement carried out in these test
instruction will be base on the testpoint indicated in the A/
V board schematic diagram in the Service manual.
•
Impedance of the measuring-equipment should be >
1MΩ
•
Most of the tests can be done using either the Diagnostic
software " Player script" which can be found in the
chapter "Diagnostic Software description and
troubleshooting" or the Menu interface using the Service
PC with a terminal emulation program ( e.g. Window
Hyperterminal ) where it is possible to control the
execution of the Diagnostic Nuclei
•
Setup for the measurement will be done in set level with
all modules connected as shown in the Wiring Block
diagram.
5.7.2
General start-up measurement
Supply check:
Before starting the measurement,ensure that all power
supply are connected to the A/V board.
Pin nbr
Supply
1010-9
-5V ( -Vcc )
1010-10
+5V
1010-11
+5V
The supply currents can be measured using a Tektronics
AM503B current probe or equivalent.
Supply
Power consumption ( AVG )
+5VA
+5V ± 3% I = 200mA
+5Vvid
+5V ± 3% I = 200mA
-5V
-5V ± 3% I = 200mA
Clock Check
Ensure the present of the clock to the DAC
Clock Name Testpoint Frequency
PCM_CLK
TP10
Audio mute check
Measure the Audio mute voltage input at pin 12 of connector
1010
Status
Value
AudioMuteOn 4.7V ± 10%
AudioMuteOff -8V ± 10%
To toggle between ON and OFF,use the following
commands:
Command
Ref.#
Name
19a
AudioMuteOn Audio Mute On
19b
AudioMuteOff Audio Mute Off
Diagnostic software descriptions and troubleshooting
11.2896MHz ± 0.02% tolerance
Remarks
www.rtv-horvat-dj.hr
5.7.3
Audio DAC and amplifier
Ensure that the Audio mute signal is OFF
To check the DAC and buffer amplifier,send the following
commands:
Command
Ref.#
Name
21a
AudioSineOn
----
Press stop
button
20a
AudioPinkNois
eOn
20b
AudioPinkNois
eOff
The audio signal ( sine or pink noise ) will also be present on
the digital output ( SPDIF ).This can be checked by
connecting digital signal to an amplifier with digital input.
Check the I2S and audio signal at the following testpoints:
Name
LRCLK
SCLK
PCM_CLK
PCM_OUT0
PCM_OUT1
PCM_OUT2
SPDIF
Front L/R out-Audio cinch
H/P L/R out
Analog out -Audio cinch
All waveforms can be refer to the waveform diagram in the
chapter "Diagnostic software description and
troubleshooting".
5.7.4
Video output and buffer amplifier
Check DC output-level at all video cinch output : 1.0V DC ±
10%
Generate a color bar using the following software
commands:
Ref.#
Command Name Remarks
23a
VideoColDencOn
61a
VideoColOutRGB RGB Colourbar
61b
VideoColOutYUV
23b
VideoColDencOff
Check the video outputs at the following testpoints:
Name
Testpoint
B_VID
TP1
G_VID
TP2
R_VID
TP3
CVBS out
TP14
S-Video-C out TP15
S-Video-Y out TP16
Y out
TP17
U out
TP18
V out
TP19
All waveforms can be refer to the waveform diagram in the
chapter "Diagnostic Software description and
troubleshooting".
Remarks
Audio output
Audio Sine
Sine,1Khz on
signal ON
stereo
Audio Sine
No waveform
signal OFF
Audio
Pink Noise on
Pinknoise ON
6 channels
Audio
No waveform
Pinknoise OFF
Testpoint
TP8
TP9
P10
TP7
TP27
TP28
TP11
TP13
TP20
TP25
Colour DENC ON
YUV Colourbar
Colourbar DENC OFF
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