Yamaha YPT-220 Manual - Page 25

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SYSTEM BOOTING FLOWCHART

Power On

Set CPU Register

Initialize Port

LCD EN = L

LCD RS = L

Starts accessing to internal

Initialize Work RAM

RAM

Turns ON the SoftPower

SoftPower = H

(IC101 117pin PF0)

If the power is turned off when

you release the power switch after

this stage, the SoftPower circuit

board (PNAM TR102 peripheral)

is defective

If the booting procedure does

not reach this stage, the CPU or

device around the CPU is defective

Starts accessing to LCD

Initialize LCD

Driver (IC301)

In case of no indication,

Opening indication

the LCD or LCD Driver

( "YAMAHA" )

(IC301) is defective

Starts keyboard scanning

Starts outputting signals from

B01–B11

* Turn on the power while holding down the

[C#2], [F2] and [G#2]

YES

Test Program ?

Test Program

( "TEST" ) indication

Test program routine

Sound can be played on the

keyboard

The keyboard is defective if it is

impossible to enter the test

Main screen

( "GrandPno" )

indication

Normal operation

PSR-E223/YPT-220