Yamaha DVD-C740 Service Manual page 17

Figure 28
The user can switch between the three different types of
groove settings by pressing OPEN/CLOSE (forward to next
nucleus in the list In-Mid-Out), or STOP (backward in the list
In-Mid-Out). This is done in a cyclic manner; note that this
test will not contribute to the test result of the Basic Engine.
Pressing PLAY/PAUSE proceeds to the next test, after the
disc motor has been shut off with a call to nucleus
BeDiscMotorOff.
5.8 Tray Test
As a last action for the Basic Engine tests, the tray test is
repeated. The local display will look as follows:
Figure 29
This test is meant to give the user the opportunity to remove
the disc in the tray. The tray position can be toggled using the
OPEN/CLOSE key. The tray will be closed (by the software, if
it is open) before proceeding to the next test when the user
presses the PLAY/PAUSE key.
5.9 Error Log (See Table on Next Page)
Reading the error log and error bits information can be useful
to determine any errors that occurred recently during normal
operation of the DVD player. Reading the error log is done by
nucleus LogReadErr.
The display during the errorlog readout looks as follows :
Figure 30
Note: Previous versions of the diagnostic software showed a 8-
digit error code.
Due to limitations in the number of digits that can be displayed
by some front panel displays, the most significant digits will not
be shown. This can be done since all the error codes used by
this player has set these 2 digits to ì00î
By pressing OPEN/CLOSE or STOP the user can move
forward or backward (respectively) through the logged error
codes. If "0000" is displayed at all positions, the error log is
empty. Display of the logged errors is done in a cyclic
manner.
By pressing PLAY/PAUSE on the local keyboard, the user
can proceed to the next test.
5.10 Error Bits
Reading the error bits is done by nucleus LogReadBits. The
display during the errorbits readout looks as follows:
Figure 31
Only the identification number (decimal) representing set
errorbits will be shown. By pressing OPEN/CLOSE or STOP,
the user can move forward or backward (respectively) through
the logged error codes. If the display only shows "EB-0", no
error bits were set. By pressing PLAY/PAUSE the user can
continue to the next test.
6 Loop Test (See Table Below)
At the start of the loop test, the local display of the DVD player
will show the interactive player test result readout in the
following display:
Figure 32
The left side of the display contains a 3-digit code, which can
have a value between 000 and 111. These values indicate the
faulty modules and are to be interpreted as follows:
Displayed Indication for each module
Value
Basic Engine
000 ok
001 ok
010 ok
011 ok
100 faulty
101 faulty
110 faulty
111 faulty
Figure 33
The loop test will perform the same nuclei as the dealer test,
but it will loop through the list of nuclei indefinitely. The
display of the DVD player will display not only the three digits
indicating correct/faulty modules and the last found error code
(as mentioned, faults are detected as far as they can be
within the scope of the diagnostic software), but also a loop
counter indicating how many times the loop has been gone
through. If an error was detected, the display will remain as in
figure 34 until the user presses the PLAY/PAUSE key and
then it will continue to the next loop.
Example:
Figure 34
The 2-digit number (23) on the right of figure 32 indicates the
number of times the loop test has been performed.
DVD-C740/DV-C6660
Mono Display
PCB PCB
ok ok
ok faulty
faulty ok
faulty faulty
ok ok
ok faulty
faulty ok
faulty faulty
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