Yamaha DP-U50 Service-Handbuch - Seite 12
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DP-U50
5. AD
(AD Test)
There are 13 sub-menu items.
1. KEY (Key reception test)
Checks if pressing of each key is properly received, using
the key reception program. Keys should be checked in the
order of USB, PC, AUX1, AUX2, DSP, MUTE, DOWN (q)
and UP (w).
When the key reception test is executed, ">USB<"
appears, urging to press the USB key.
When the USB key is pressed properly, "OK" appears for a
moment followed by ">PC<", urging to press the next PC
key.
When all these keys are checked in this way and check
results are satisfactory, this mode is over.
If an incorrect key is received, "NG" appears and testing
does not proceed to the next key. To exit from this mode,
keep pressing the DSP key for a long period of time.
2. LEVEL (Display of key voltage level)
Displays the voltage level of the key and the reference
value in parallel.
Use the same order for checking keys as the previous key
reception test.
When the voltage level test is executed, ">USB<" appears,
urging to press the USB key.
When the USB key is pressed, "00:00" appears for 1
second followed by ">PC<", urging to press the next PC
key.
00:00
Reference value
The A/D value is displayed in % (voltage value based on 5V as 100%).
When the voltage level of all the keys is checked in this
way, this mode is over.
To exit from this mode before checking all the keys, keep
pressing the DSP key for a long period of time.
11
Measured value
3. JUDGE (Judgment of key voltage level)
Checks if the voltage level of each key is within the normal
range by comparing it with the reference value.
Use the same order for checking keys as the previous key
reception test.
When the key voltage level judge test is executed,
">USB<" appears, urging to press the USB key.
When the USB key is pressed, "OK:00" appears for 1
second followed by ">PC<", urging to press the next PC
key.
OK:00
Judgment result
When the judgment result is not satisfactory, "NG"
appears.
When the voltage level of all the keys is judged in this way,
this mode is over.
To exit from this mode before making judgment of all the
keys, keep pressing the DSP key for a long period of time.
4. V-ERR (Display of power voltage , when abnormal)
Displays for 2 seconds the voltage value when the power
supply protection function has worked due to abnormal
voltage. (The voltage value is meaningless unless the
power supply protection function has worked.)
The voltage value said here is obtained through calculation
using 5V as the reference voltage. Note that deviation of
the reference voltage will result in an error of the voltage
on display.
Measured value