Yamaha Portable Grand DGX-305 Service Manual page 46

DGX-305/DGX-505
TEST No. LCD (initial)
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Test Functions and Judgment Criteria
Output the sine wave by changing the channels in sequence from C2 to G4.[32 notes]
Check the sound by hearing that there is not noise or abnormal sound.
After auto-scaling is finished, individual keys can be played. (If playing two or more
keys simultaneously, the first pressed key has priority to make a sound.)
Connect the frequency counter to the [PHONES/OUTPUT] jack. (L or R)
Sets PAN to Center and produces a signal at 440.0 Hz ± 1.76 Hz
Check that the correct signal is produced.
Connect the level meter (with a JIS-C filter) to the [PHONES/OUTPUT] jack. (33 ohm load)
Set the [MASTER VOLUME] at maximum and check the output level (1 kHz sine wave, PAN=R).
PHONES L : less than -50.0 dBu PHONES R : -1.0 dBu ± 2 dB
Connect the level meter (with a JIS-C filter) to the [PHONES/OUTPUT] jack. (33 ohm load)
Set the [MASTER VOLUME] at maximum and check the output level (1 kHz sine wave, PAN=L).
PHONES L : -1.0 dBu ± 2 dB
Connect the level meter (with a JIS-C filter) to the [PHONES/OUTPUT] jack. (33 ohm load)
Set the [MASTER VOLUME] at maximum. Check D/A converter noise.
PHONES L/R : Less than -80.0 dBu
Check the switches on the panel.
Press the switches on the LCD as instructed. A pre-assigned note is output when the switch is
pressed. A rotary encoder is clockwise set up to UP and is counterclockwise set to DOWN.
(See Ò Table 1Ó) As the check result appears on the LCD when all the switches are pressed as
instructed. Check that Ò
(To stop this check before reaching its end, press the lowest (leftmost) white key on the
keyboard to return to the test item name on display.)
Check all the panel LEDs' lighting up. Confirm that all the panel LEDs will light up.
Check all the red panel LEDs' lighting up.
Confirm that all the red panel LEDs will light up.
Check all the blue panel LEDs' lighting up.
Confirm that all the blue panel LEDs will light up.
Check that all LCD dots are on.
Check that all LCD dots are off.
Connect the foot switch (FC-4 or FC-5) to the [SUSTAIN] jack.
Check that the C3 note is output when the [START/STOP] button is pressed while
stepping the pedal and the C4 note is output when releasing the pedal. The sound stops
when stepping the pedal again. Check that the LCD displays Ò
Check the pitch bend wheel.
Check that the C3 note is output when rotating the [PITCH BEND]wheel to minimum
and the C4 note is output when rotating it to maximum.
Check USB.
Connect a PC with drivers installed and the main unit with a USB cable, and execute the test.
Confirm that the C4 note is output and "
Check the battery.
Removing the AC adapter sets to the Battery Check mode. (In advance, install the batteries.)
The A/D value of the battery is detected and displayed with hexadecimal number on the LCD.
Bat :XX XX :68~88 (DC9V)
Check the ROMs that are connected to the CPU.
The test results appear on the LCD. Check that the LCD displays Ò
It takes about 20 seconds.
Check the RAMs that are connected to the CPU.
The test results appear on the LCD. Check that the LCD displays Ò
It takes about 5 seconds.
Check all addresses of Flash ROM.
The check results appear on the LCD. Confirm that the "
Check takes about 60 seconds.
All backup domains are initialized and it changes into a factory-shipments state when
executing this test.
Exit from the test program after executing this test.
PHONES R : less than -50.0 dBu
Ó is displayed.
" is displayed on LCD.
Ó.
Ó.
Ó.
" is displayed.