Yamaha Portatone PSR-VN300, Service Manual

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PSR-VN300
20
■
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 33
Ω
to the terminal [PHONES/OUTPUT]. Input impedance of the measuring device
should be 1 M
Ω
or more.
3) Jig: Foot switch (FC-4 or FC-5), MIDI cable.
4) Control condition
MASTER VOLUME : MAX.
PEDAL : OFF
REVERB : OFF
Others : Default status at the time of a power switch ON
2 Start-up the Test Program
Holding down the keys [C2#], [F2], [G2#] simultaneously, press the [STANDBY/ON] switch.
G
TEST
F2
C2# 2#
STANDBY/ON
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.
1
2
3
4
5
6
LCD display
001 : Version
002 : Rom Chk1
003 : Ram Chk1
006 : FRomChk1
011 : TG1 Chk
013 : Pit Chk
Test descriptions, judging conditions, etc.
Displays version of the ROM.
“[
***
] Prog ” is displayed on the LCD. [
***
] : Version
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. (440.14 Hz
±
0.22 Hz)
Check that the correct signal is output.
(0 dBu = 0.775 V)