Yamaha DVD-C740 Service Manual page 15

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4 Mono PCB Digital Part
4.1 Picture Test
The picture test is performed by putting a predefined picture
(color bar PAL) on the display (nucleus VideoColDencOn),
and asking the user for confirmation.
The display will show the following message:
By pressing OPEN/CLOSE the user confirms the test, pressing
STOP will indicate the picture was invisible or incorrect.
Pressing PLAY/PAUSE will proceed to the next test. If the user
presses PLAY/PAUSE without pressing OPEN/CLOSE or STOP
first, the result of this test will be TRUE (picture ok).
Note: The color 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.
4.2 Sound 1 & SCART DVD Test
The first sound test is performed by starting a pink noise sound
that needs confirmation from the user (nucleus
AudioPinkNoiseOn).
The display will show the following message:
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On the TV screen a color bar (generated by nucleus
VideoColDencOn) is visible and the internally generated
pinknoise is audible.
By pressing the PLAY/PAUSE 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/PAUSE key, the video will be switched
over to the external source. This must now become visible on
the TV screen (using the SCART).
The local display will show the following message:
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The internally generated color 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,
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the internally generated color bar becomes visible again.
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The test can be left by pressing the PLAY/PAUSE key for
more than one second.
4.3 Sound 2 Test
The second sound test 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:
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/PAUSE
will proceed to the next. If the user presses PLAY/PAUSE
without pressing OPEN/CLOSE or STOP first, the result of this
test will be TRUE (sound ok).
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