Yamaha Portatone YPT-300 Service-Handbuch - Seite 18
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PSR-E303/YPT-300
TEST PROGRAM
∗ If the test number 47 "Factory Set" is executed, the data already set will be lost.
1
Preparation
1) Use an AC adaptor PA-3C or PA-32.
2) Measuring device: Frequency counter, which can detect thousandth digit, Level meter (with JIS-C filter)
Note: Connect a load resistor of 33Ω to the terminal [PHONES/OUTPUT]. Input impedance of the measuring device
should be 1MΩ or more.
3) Jig: Foot switch (FC-4 or FC-5), MIDI cable
2
Start-up the Test Program
Holding down the keys [C2#], [F2], [G2#] simultaneously, press the [STANDBY / ON] switch.
C2#
F2
3
Test Procedure
1) When the test program is started, "TEST" will be displayed on the LCD.
2) Press the [–] or [+] button of the number buttons to select a test program item.
3) Press the [START/STOP] button to execute the test.
If the result is OK or test item is completed, press the [START/STOP] button again to return to the item selection
display.
Press the [–] or [+] button of the number buttons to select the next test item.
A cursor ("_") is shown below the first character of the item for which the test results are OK.
If the results are NG, press the lowest key in the keyboard (white key C1) to return to the item selection display.
4
Test program list
Test No.
LCD display
1
001 : Version
2
002 : Rom Chk1
3
003 : Ram Chk1
4
006 : FRomChk1
5
011 : TG1 Chk
6
013 : Pit Chk
7
014 : Output R
8
015 : Output L
18
G2#
STANDBY/ON
Displays version of the ROM.
∗∗∗
] Prog" is displayed on the LCD.
"[
ROM connected to the bus of the CPU is checked.
Make sure that "Rom OK" is displayed on the LCD.
RAM connected to the bus of the CPU is checked.
Make sure that "Ram OK" is displayed on the LCD.
FROM connected to the bus of the CPU is checked.
Make sure that "FRom OK" is displayed on the LCD.
Plays each key automatically in the order of scale (auto-scaling). (32 notes from C2 to G4
will be played.) Check that there is no abnormal sounds or noise. When the auto-scaling
is finished, "TG1 End" will be shown. Press a key to play a sound. (Single note, the key
pressed first will be played)
Connect the frequency counter to the [PHONES/OUTPUT] terminal. (Either L or R)
Checks pitch. (440.14Hz±0.22Hz)
Check that the correct signal is output.
Connect the level meter (with JIS-C filter) to the L/R terminals of the [PHONES/OUTPUT].
(33Ω of load)
Set the [MASTER VOLUME] to the maximum level and check the output level.
• PHONES L: –45.0dBu or less
Connect the level meter (with JIS-C filter) to the L/R terminals of the [PHONES/OUTPUT].
(33Ω of load)
Set the [MASTER VOLUME] to the maximum level and check the output level.
• PHONES L: –1.5dBu±2dB
TEST
Test descriptions, judging conditions, etc.
• PHONES R: –1.5dBu±2dB
• PHONES R: –45.0dBu or less
(dBu=dBm)
∗∗∗
[
] : Version