Interactive Tests; Display Pcb; Display Test; Led Test - Yamaha DVD-S520 Service Manual

INTERACTIVE TESTS

1. DISPLAY PCB

1.1 DISPLAY TEST

The display test is performed by nucleus DispDisplay. By
putting a series of test patterns on the local display, the
local display is tested. To step through all different
patterns, the user must either press PLAY (pattern is ok)
or PAUSE (pattern was incorrect) to proceed to the next
pattern. The display of patterns is continued in a cyclic
manner until the user presses NEXT. If the user presses
NEXT before all display patterns are tested, the
DispDisplay nucleus will return TRUE (display test
successful).

1.2 LED TEST

The LED(s) on the DVD player is (are) tested by nucleus
DispLed. The user must check if the LED(s) is (are)
lighted; if it is, press PLAY, if it is not, press PAUSE. By
pressing NEXT the script will proceed to the next test. If
the user presses NEXT before PLAY or PAUSE, the
DispLed nucleus will return TRUE (LED test successful).
If OK, press PLAY Y
If OK, press PLAY
If OK, press PLAY
press NEXT to continue
Figure 1
1.3 KEYBOARD TEST
The keyboard of the DVD player is tested by nucleus
DispKeyb. The user is expected to press all keys on the
local keyboard once. The code of the key pressed is
shown on the local display (1 hexadecimal digit)
immediately followed by a (hexadecimal) number
indicating how many times that key has been pressed.
Example of the local display during this test:
Figure 2
The key-codes displayed on the local display will scroll
from right to left when the display gets full, the text "tb-" will
remain on display.
If NOK, press PAUSE
If NOK, press PAUSE
If NOK, press PAUSE
key id. key
0 PLAY
1 NEXT
2 PREVIOUS
3 PAUSE
4 STOP
5 OPEN/CLOSE
A POWER (B,G models)
Figure 3
If any keys are detected more than once (due to hardware
error), the key-code is displayed twice (or more), with the
second digit increased by 1.
If the user does not press all keys minimally once (in any
order), the DispKeys nucleus will return FALSE and cause
an error in the overall result of the player script.
The user can leave the keyboard test by pressing the
NEXT key on the local display of the DVD player for at
least one full second.
The result of the keyboard test is shown on local display
as follows:
Figure 4
Or
Figure 5
Pressing NEXT on the local keyboard again will proceed
to the next text.
1.4 REMOTE CONTROL TEST
The remote control of the DVD player is tested by nucleus
DispRc. The user must press any key on the remote
control just once. The codes of the key pressed will be
shown on the local display in hexadecimal format.
Example:
Figure 6
DVD-S520/DV-S5450
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