Yamaha PortaTone PSR-270, Service Manual

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PSR-270
18
20 020:SW Chk Check switches on the panel.
Press the switches which are displayed on the LCD.
A pre-assigned note is output when depressing the switch.
The test result appears on the LCD.
28 028:LCD On Check that all LCD dots are on.
29 029:LCD Off Check that all LCD dots are off. The LCD becomes white.
31 031:PD1 Chk Connect the foot switch to the [FOOT SWITCH] jack.
Check that the C3 note is output when starting the test program.
Check that the C4 note is output when pushing the pedal and the tone is turned off
when releasing the pedal.
The test result appears on the LCD.
37 037:MIDI Chk After connecting the [MIDI IN] jack and [MIDI OUT] jack with a MIDI cable, execute the
test.
Check that the C4 note is output and that the test result appears on the LCD.
41 041:ROM Chk2 Checks the ROM. The test result appears on the LCD.
42 042:RAM Chk2 Checks the RAMs which are connected to the CPU.
The test result appears on the LCD.
46 046:Back Up 2 Performs the RAM back-up check.
After checking that the beginning becomes NG, turn the power switch off.
Enter the test program and perform the RAM back-up checks then check again.
Check that the LCD displys OK.
Note: Do not turn on the [STAND BY ON] switch on by normal mode during
standing by. If this should happen, RAM data will be lost.
47 047:Factory All RAMs are initialized and set to the factory preset date when executing this test.
The result appears on the LCD.
48 048:TestExit Exit from the test program after executing this test.
2. INITIALIZE
Except for the data listed below, all PSR-270 panel settings are reset to their initial settings
whenever the power is turned on. The data listed below are backed up (i.e. retained in the
memory) as long as either an AC adaptor is connected or a set of batteries is installed.
User Song Data Metronome Volume
User One Touch Setting Data Touch On/Off
One Touch Setting Bank Number Touch Sensitivity
EZ Chord Data Split Point
EZ Chord Bank Number Data Accompaniment Split Point
Smart Chord Number Footswitch Assign Function
Data Initialization
All one touch setting
(user) and song memory
data, plus the other
settings listed above, will
be erased and/or
changed when the data
initialization procedure is
carried out.
Carrying out the data
initialization procedure
will usually restore
normal operation if the
PSR-270 freezes or
begins to act erratically
for any reason.
All data can be initialized and restored to the factory preset condition by turning on the
power while holding the highest (rightmost) white key on the keyboard. “CLr Backup” will
appear briefly on the display.