Casio WK-1500 manual Power Amplifier IC201 LA4620, LED Driving, Reset Circuit, Cpu, LSI14

POWER AMPLIFIER (IC201: LA4620)
The power amplifier is a two-channel amplifier with standby switch.
		+							19 Boot11
IN11+	3
		Input		Pre-drive			Power		20 OUT11
IN11–	5	Amp.		Amp.			Amp.
		–
					RL Short
									21 PoGND1
					Protector
	4	–
IN12–
		Input		Pre-drive			Power		22 OUT12
		Amp.		Amp.			Amp.
		+
									23 Boot12
			Terminal		Ripple		Pop Noise
			Protection				Prevention		1 VCC1
PriGND	6				Filter
			Circuit				Circuit
		+							18 Boot21
IN21+	9
		Input		Pre-drive			Power		17 OUT21
IN21–	7	Amp.		Amp.			Amp.
		–
					RL Short
									15 PoGND2
					Protector
		–
IN22–	8
		Input		Pre-drive			Power		14 OUT22
		Amp.		Amp.			Amp.
		+
									12 Boot22
		16	2	10			11	13
		NC	DC	MUTE			VCC2	ADJ
LED DRIVING			LVDD
		La ~ Lg, Lp				LD0 ~ LD7

					CPU
			Q15 ~ Q18
					LSI14
	IC301		LED Driver
	BA612		IC17		HD6433294A19F
LED Driver
		UPD65611GB-019-3BA
				P40
		KO0 ~ KO3, KO5
				P41

LG

RESET CIRCUIT

KO Signal Generator

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU then initializes its internal circuit and clears the working storage RAM.

When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU provides APO signal to the power supply circuit and raises RESET signal to +5 V to reset the DSP, the key controller and the KO signal generator.

Battery set	VDD
VDD
RESET
Reset IC	CPU
IC13	LSI14
RH5VL36AA	HD6433294A19F
POWER	-NMI
From power switch
APO	P42
To power supply circuit

	DVDD		DVDD
KO Signal Generator		DSP
LSI17		LSI11
UPD65611GB-019-3BA		HG51B155FD-1

-RESET

	VDD		DVDD
Working Storage RAM		Key Controller
LSI15		LSI16
TC55257DFL-70L		HG52E35P

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