Casio GZ-50M Service Manual page 13

Pin No. Terminal In/Out
1 SEL
2 D.GND
3 NC
4 DVDD
5 A.GND
6 R.OUT
7, 8 A.VDD
9 R.REF
10 L.REF
11 L.OUT
12 A.GND
13 LRCK
14 LRSEL
15 SI
16 CLK
POWER SUPPLY CIRCUIT
The power supply circuit generates five voltages as shown in the following table. VDD voltage is always
generated. The others are controlled by the power ON signal output from the CPU.
Name Voltage
VDD +5 V
DVDD +5 V
AVDD +5V
AVCC +7 V
VCC +8 V
RESET CIRCUIT
When 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
the power ON signal to the power supply circuit and raises RESET signal to +5V to reset the DSP.
VDD
RESET
Reset IC
IC104
RH5VL36A
POWER
From power switch
In Mode selection terminal. Connected to ground.
In Ground (0V) source for the internal digital circuit
Not used.
In +5V source for the internal digital circuit
In Ground (0V) source for the right channel
Out Right channel sound waveform output
In +5V source for the internal analog circuit
In Right channel reference voltage terminal
In Left channel reference voltage terminal
Out Left channel sound waveform output
In Ground (0V) source for the left channel
In Word clock input
In Not used. Connected to ground.
In Sound data input
In Bit clock input
CPU, Reset IC, Working strage RAM
DSP, Effect RAM, DAC, Pilot lamp
DAC, Filter
Headphone amplifier, Line ount amplifier
Mute circuit
VDD
CPU
LSI104
-RESET
HD6433298A42F
Power ON signal
-NMI
P42
To power supply circuit
— 13 —
Function
For operation of
DVDD
DSP
LSI103
HG51B155FD-1
VDD
Working Storage RAM
LSI106
LC3564SM-85