Casio GZ-500 manual Power Amplifier IC402 LA4598, LED Driving

Page 16

POWER AMPLIFIER (IC402: LA4598)

The power amplifier is a two-channel amplifier with standby switch.

The following table shows the pin function of IC402.

Pin No.

Terminal

In/Out

Function

 

 

 

 

 

 

1

Power GND

 

In

Ground (0V) source

 

 

 

 

 

 

2

Ch1 B.S.

 

 

 

Terminal for a bootstrap capacitor

 

 

 

 

 

 

 

 

 

3

Ch1 OUT

 

Out

Channel 1 output

 

 

 

 

 

 

4

VCC

 

In

+9V source

 

 

 

 

 

 

5

Ch1 N.F.

 

In

Negative feedback input

 

 

 

 

 

 

6

Ch1 IN

 

In

Channel 1 input

 

 

 

 

 

 

7

D.C.

 

 

 

Terminal for a decoupling capacitor

 

 

 

 

 

 

 

 

 

8

Pre GND

 

In

Ground (0V) source

 

 

 

 

 

 

9

Stand by

 

In

Power control signal input. 0 V: Off, +9 V: On

 

 

 

 

 

 

10

Ch2 IN

 

In

Channel 2 input

 

 

 

 

 

 

11

Ch2 N.F.

 

In

Negative feedback input

 

 

 

 

 

 

12

Ch2 OUT

 

Out

Channel 2 output

 

 

 

 

 

 

13

Ch2 B.S.

 

 

 

Terminal for a bootstrap capacitor

 

 

 

 

 

 

 

 

 

14

NC

 

 

 

Not used

 

 

 

 

 

 

 

 

 

LED DRIVING

LVDD

La ~ Lg, Lp

LS0 ~ LS7

 

 

 

CPU

 

 

Q104 ~Q111

LSI106

 

 

LED Driver

IC371

 

IC102

HD6433298A42F

BA612

LED Driver

TC74HC174AF

 

 

 

 

P40

 

 

 

 

 

KP0 ~KP5

P41

 

 

 

 

(KO0 ~ KO5)

 

 

 

 

 

KO Signal Generator

 

LG

 

 

 

— 16 —

Image 16
Contents GZ-500 Contents SpecificationsSetting UP the Keyboard Setting Setting operationInitial settings OperationMidi Message Setting Setting operation Initial settings in The General Midi systemTransmitting Midi Messages Selecting a Midi channel 1. Press the Midi button Initial settings of Midi control change Setting on/off of a Midi channelReceiving Midi Messages Transmitting a digital effect typeTransmittable Messages Receivable MessagesBlock Diagram KC7Circuit Description KEY MatrixPower Supply Circuit Reset CircuitButton Matrix Name Voltage For operationDigital Signal Processor LSI102 HG51B155FD Pin No Terminal In/Out FunctionCE1, Trsb Block diagram of DSP and DAC circuit GND4DAC LSI104 UPD6376GS KEY Controller LSI107 HG52E35PFilter Block Power Amplifier IC402 LA4598 LED DrivingMajor Waveforms Schematic Diagrams Main PCB JCM715-MA1M Console PCBs JCM715-CN1M/2M/3M Keyboard PCBs M616T-KY1M/KY2M Exploded View Parts List Amp./Volume PCBs FOB Japan Code No Parts Name Specification Yen Unit Price MA0800751A