Casio ML-1 Service Manual

Also see for Magical Light ML-1: Operation manual Operation manual

Contents

Casio ML-1 Service Manual Manual pdf 7 page image

— 5 —IC LEAD IDENTIFICATIONLY1LY2LY3LY4LY5LY6LY7LVDD1LGND2LX0LX1LX2LX3LX4LX5LX6123456789101112131415163029282726252423222120292817AGNDOUTAVDDRESETTEST3TEST2TEST1GND1VDDCOSOCOSIGND2LVDD2LX7KO7KO6KO5KO4KO3KO2KO1KO0KI7KI6KI5KI4KI3KI2KI1KI0464544434241403938373635343332314748495051525354555657585960KO8KO9KO10KO11D4D3D2D1OPØ2Ø1CEGND1LY0IC1: AN8053N12345678161514131211109SPONCSPGPC-1PC-2SPISPMVREFVCCNCCONTVREGNCNCNCPR GNDLSI1: MSM6521-10T1: 2SD1858Q, RT2: 2SC1740SQTROUBLESHOOTINGNature of Trouble Faulty Block CheckpointNo power Power Supply Circuit Base of T1 should receive +6 V.Emitter of T1 should provide +5.6 V.Power switch Switch contact.Power Jack (J1) Jack contact.No sound at all Power Amp.(IC1: AN8053N)Pin 16 should receive +7.5 V when thepower switch is turned on.Voltage at pin 14 should drop at 0Vwhen the power switch is turned on.Check output signal of pin 1.CPU (LSI1: MSM6521-10) Voltage at pin 27 should rise 0V to 5.6Vwhen the power switch is turned on.Pins 39 ~ 41 and 43 ~ 46 should providepulses.Pin 29 should have a sound signal whena key is pressed.Oscillator (XL1) Pins 20 and 21 of the CPU shouldreceive an ocsillation signal.Keyboard LEDs don'tlight upKeyboard LEDKeyboard LED Matrix Open circuir on LX or LY line.A certain key or switchdoes not functionKey and Switch Matrix Dust on the contact.Certain keys or switchesdo not functionKey and Switch Matrix Open circuit on KC or KI line.