Yamaha PSR-S550B, Service Manual

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PSR-S550/PSR-S550B
-- -- Contrast Check
Set the contrast knob to the legible position of LCD. When the contrast knob is turned
clockwise (or counterclockwise), the LCD becomes blue (or white).
1 001 Version Displays ROM versions (Prog, Wave).
(In case of OK:"XXX" Prog / Wave, NG:"Err" Prog / Wave)
2 002 Rom Chk1 Checks the ROM that is connected to the CPU bus.
The test results appear on the LCD.
Check that the LCD displays "Rom OK".
(OK:"Rom OK", NG:"Rom NG")
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TEST PROGRAM
* If you execute the test No.49 (Factory Set), then the user's preset data may be lost.
Therefore, back up the user's data in advance.
A. PREPARATION
1) PA-301 or PA-300B (AC adaptor) is used.
2) Measuring instruments: frequency counter, level meter (with JIS-C filter)
Note: Connect a stereo plug to the [PHONES/OUTPUT] jack at 33 Ω .
3) Jigs: Foot switch (FC-4 or FC-5), USB cable, USB flash memory, USB-MIDI driver (*1)
PC (Install a USB-MIDI driver (*1) in PC and finish the THROUGH setup.)
*1 Obtain the USB-MIDI driver from CD-ROM(X9448A00) for PSR-S550/PSR-S550B or Yamaha official website.
(URL>>http://www.yamahapkclub.com)
B. HOW TO ENTER THE TEST PROGRAM
While pressing the C2#, F2 and G2# keys, turn the [STANDBY/ON] switch on.
ON
STANDBY
F2
C2# G2#
C. TEST PROCEDURE
1) When the test program is started, "TEST" will be displayed on the LCD.
2) Press the [+/YES] or [-/NO] button to select a test program item.
3) Press the [START/STOP] button to execute the test.
* If the test result is OK, or the test item is completed, press the [START/STOP] button again to return to the test item selection
display.
Proceed to the next test by pressing the [-] or [+] button.
* Press the [-] or [+] button of the number buttons to select the next test program item.
* When the test result is OK, an asterisk ( ∗ ) is added in front of its item name on display.
If the test result is NG, press the [DEMO] button or the lowest (leftmost) white key to return to the item selection display.
TEST
LCD Display Test Descriptions, Judgment Criteria
No.
D. Test Item List