34
DGX-620/YPG-625
Checks the ROM that is connected to the CPU. (OK:“Rom OK”, NG:“Rom NG”)
The test results appear on the LCD. Check that the LCD displays “Rom OK”.
Checks the RAM that is connected to the CPU. (OK:“Ram OK”, NG:“Ram NG”)
The test results appear on the LCD. Check that the LCD displays “Ram OK”.
Checks the flash ROM that is connected to CPU bus.
The check result appears on the LCD. Check that the LCD displays “Flash Rom OK”.
(OK:“Flash Rom OK”, NG:“Flash Rom NG”)
Checks USB.
(OK:“USB Storage OK”, NG:“USB Storage NG”)
Connect a USB memory to the [USB TO DEVICE] jack with a USB cable, and execute the test.
The test results appear on the LCD. Check that the LCD displays “USB Storage OK”.
Outputs the sine wave by changing the channels in sequence from C2 to G4. [32 notes]
Check the sound by hearing that there is no 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 440.14 Hz +/-0.22 Hz.
Check that the correct signal is produced.
Volume Decrescence Check
Connect the level meter (with a JIS-C filter) to the [PHONES/OUTPUT] jack. (33 ohm load)
Set the [MASTER VOLUME] at minimum and check the output level.
PHONES L : less than -70.0 dBu PHONES R : -70.0 dBu (dBu=dBm)
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 -45.0 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 PHONES R : less than -45.0 dBu
Checks 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 P.36 “Table 1”.) The check result appears on the LCD when all the switches are pressed as
instructed. Check that “SW OK” is displayed.
Also, check that no key stick is existed.
(OK:“SW OK”, NG:“SW NG”, When multiple switchs are pressed at the same time:“Over Two”)
Check that all the LEDs on the panel are on.
Check that all the red LEDs on the panel are on.
Check that all the green LEDs on the panel are on.
Check that all LCD dots are on. (The whole screen becomes white.)
Check that all LCD dots are off. (The whole screen becomes blue.)
Test Descriptions, Judgment Criteria
LCD Display
TEST No.
002 Rom Chk1
003 Ram Chk1
006 Flash Rom Chk1
007 USB Storage Chk
011 TG1 Chk
013 Pit Chk
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014 Output R
015 Output L
020 SW Chk
021 All LED Chk
022 Red LED Chk
023 Green LED Chk
028 LCD On
029 LCD Off
2
3
6
7
11
13
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14
15
20
21
22
23
28
29
