Philips DVD723/001 Service Manual page 26

EN 26 5. DVD 723-743
5.4 Mono PCB Digital Part
5.4.1 Picture Test
The picture test is performed by putting a predefined picture
(colour bar) on the display (nucleus VideoColDencOn), and
asking the user for confirmation.
The display will show the following message:
Figure 5-18
By pressing OPEN/CLOSE the user confirms the test, pressing
STOP will indicate the picture was invisible or incorrect.
Pressing PLAY will proceed to the next test. If the user presses
PLAY without pressing OPEN/CLOSE or STOP first, the result
of this test will be TRUE (picture ok).
Note: The colour bar must be simultaneously available on the
CVBS, YC, and RGB (or YUV) outputs available. On the
SCART only the CVBS and RGB signals will be available.
5.4.2 Sound 1 & SCART DVD Test
The first soundtest is performed by starting a pink noise sound
that needs confirmation from the user (nucleus
AudioPinkNoiseOn).
The display will show the following message:
Figure 5-19
On the TV screen a colour bar (generated by nucleus
VideoColDencOn) is visible and the internally generated
pinknoise is audible.
By pressing the PLAY key, the user confirms the test.
Pressing the STOP key will indicate the sound was inaudible or
incorrect.
Note: Only for double scart models, SCART loop-through will
be simultaneously active during this test. SCART loop-through
will be measured with the aid of an external video source.
By pressing the PLAY key, there will be switched over to the
external source. This must become now visible on the TV
srcreen (using the SCART).
The local display will show the following message:
Figure 5-20
The internally generated colour bar is still available on the
CVBS and Y/C outputs. And the pinknoise-signal is still
available on the cinch audio outputs. By pressing the
OPEN/CLOSE button, the internal generated colour bar
becomes visual again.
Diagnostic Software, Trouble Shooting and Test Instructions
5.4.3
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The test can be left by pressing the PLAY key for more than
one second.
Sound 2 Test
The second soundtest is performed by producing a sine sound
(nucleus AudioSineOn). The signal can be stopped by pressing
the STOP key.
The display will show the following message:
Figure 5-21
After the audio signal has been stopped, by pressing
OPEN/CLOSE, the user confirms the test. Pressing STOP will
indicate that something went wrong. Pressing PLAY will
proceed to the next. If the user presses PLAY without pressing
OPEN/CLOSE or STOP first, the result of this test will be TRUE
(sound ok).
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