Casio CPS-85 Service Manual
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— 5 —NOMENCLATURE OF KEYSPOWER SUPPLY CIRCUITThe power supply circuit generates five voltages as shown in the following table. VDD voltage is alwaysgenerated. The others are controlled by POWER signal from the CPU.RESET CIRCUITWhen batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. TheCPU then initializes its internal circuit, and clears the working storage RAM.When the power switch is pressed, the CPU receives a low level signal. The CPU sends POWER signalto the power supply circuit, also sends a reset signal to the DSP.When the keyboard is powered by batteries and no operation is made for six minutes, CPU drops signalPOWER to shut all the voltage except VDD off.C2C#2 D#2 F#2 G#2 A#2 C#3 D#3 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#5 C#6 D#6 F#6 G#6 A#6 C#7 D#7 F#7 G#7 A#7D2 E2 F2 G2 A2 B2C1 D1 E1 F1 G1 A1 B1A0 B0 C3 D3 E3 F3 G3 A3 B3C#1 D#1 F#1G#1A#1A#0C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 D6 E6 F6 G6 A6 B6C6 C7 D7 E7 F7 G7 A7 B7 C8Reset ICIC1RN5VD35AADSPLSI1HG51B277FBVDDReset signalTo power supply circuitVDDBattery setRESETVDDPower switchNMIPOWERPLECPULSI4GT913FSCKOemaN egatloV fonoitareporoFDDV V5+ MARtceffE,MARegarotsgnikroW,MORecruosdnuoS,PSD,CIteseR,UPCDDVA V5+ skcajnieniL,CADDDVL V5+ pmaltoliPCCV V9+ reifilpmarewoP,skcajtuoeniLCCVA V9+ .pmAerP |
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