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POWER SUPPLY CIRCUIT
The power supply circuit generates seven voltages as shown in the following table. VDD voltage is always
generated. The others are controlled by APO signal from the CPU.
RESET CIRCUIT
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 sends APO
signal to the power supply circuit, also sends a reset signal to the DSP.
Reset IC
IC1
RN5VD40AA
DSP
LSI2
HG51B277FB-1
VDD
Reset signal
To power supply circuit
VDD
Battery set
RESET
VDD
POWER
From power switch
NMI
RSTB
RESB
APO
PLE
CPU
LSI1
GT913F
SCK0
Summary of Contents for CTK-620L
Page 16: ...15 SCHEMATIC DIAGRAMS Main PCB JCM447 MA1M AT 49 30M 4 11 1 12 7 8 3 5 6 2 10 9...
Page 17: ...16 Sub PCB JCM447 MA2M 5 6 V 5 6 V 5 6 V 0 7 V 2 V 50V 1...
Page 18: ...17 Console PCB JCM447 CN1M...
Page 19: ...18 Console PCB JCM447 CN2M...
Page 20: ...19 Display PCB JCM447 LCD1M...
Page 21: ...20 Keyboard PCBs JCM618T KY1M KY2M...
Page 22: ...21 LED PCB JCM447 LD1M...
Page 23: ...22 LED PCB JCM447 LD2M...
Page 24: ...23 LED PCB JCM447 LD6...
Page 25: ...24 Console PCBs JCM447 CN3M CN4M...
Page 26: ...25 Console PCB JCM447 CN5M...
Page 27: ...26 LED PCBs JCM447 LD4M LD5M...
Page 28: ...27 LED PCB JCM447 LD3M...
