Casio MA-100 User Manual Page 1

ELECTRONIC KEYBOARDMA-100MA-100100 TONESKEYBOARD00 PIANO01 ELEC PIANO02 FUNKY CLAVI03 HARPSICHORD04 ELEC ORGAN05 JAZZ ORGAN06 PIPE ORGAN07 CHU

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— 11 —PCB VIEWMain PCB14236 75

— 12 —R-1R-211091221334871156EXPLODED VIEW

Notes: This parts list does not include the cosmetic parts, whichparts are marked with item No. "R-X" in the explodedview.Contact our spare

FOB JapanN Item Code No. Parts Name Specification Q N.R.Yen R Unit PriceIC101 2114 3269 IC, Power Amp. AN8053N 1 ALSI101 2011 2961 LSI, CPU MSM63

MA0400761A

F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4C5 D5 E5 F5 G5 A5 B5C6D#3C#3A#2G#2F#2D#2C#2C2D2E2F2G2A2B2 C3 D3 E3C

BLOCK DIAGRAMCPUMSM6387-22LSI101AmplifierAN8053NIC101SpeakerOscillatorQ102, X101VDDKeyboardButtonsFilterQ101KO0 ~ KO8KI0 ~ KI7AVDDCIRCUIT DESCRIPTI

Pin No. Terminal In/Out Function1, 2 TEST1, TEST2—Not used. Connected to ground.3 RESET In Power ON reset terminal. On: +5 V Off: 0 V4 AVDD In +5 V s

TROUBLESHOOTINGNo powerPower indicator does not light up.Connect an AC adapter into the power jack.Does the keyboard work?Measure voltage at pin 16 of

No soundMeasure voltage at pin 13 of IC AN8053N.Is the voltage +5 V ?Measure voltage at pin 16 of IC AN8053N.Is the voltage +6.8 V?Follow flow chart o

AMeasure voltage at pins 22 ~ 30 of LSI MSM6387-13.EndIs the voltage +0.3 V?Replace LSI MSM6387-13.Does the keyboard work?Replace ceramic oscillator X

MAJOR WAVEFORMS1Clock pulse COSIMSM6387-13 pin 823Key scan signal KO0MSM6387-13 pin 30Key scan signal KO1MSM6387-13 pin 294567Sound signal output MSM6

— 9 —SCHEMATIC DIAGRAMS