99: Making PWM power supply 7.5V 500mA
instead bad original PS 7VDC 150mA.
Making back cover for Ni-Cd battery. 
Backup 27C512.
1179: Repair the keyboard,
replacing the new set Ni 1.2V*5 bat.
3055: Repair the keyboard,
replacing the new set Ni 1.2V*5 bat.
Making PWM power supply 6V.