Casio TK-6500 Series Manuel de dépannage - Page 7

Parcourez en ligne ou téléchargez le pdf Manuel de dépannage pour {nom_de_la_catégorie} Casio TK-6500 Series. Casio TK-6500 Series 19 pages.

2-2-2. Procedure Repair 1

1) Check that contact of CPU defective. ( For example, pin of CPU is floating. )

2) Check that the power supply is supplied to CPU.

( For example, the cables between the CPU and the power supply are snapping. )

3) Check "X1" of oscillator whether the signal of wave form is as follow.

( If not, resolder the connection point or replace "X1" of oscillator. )

4) Check "IC10" of CPU.

( If there are no signal at the X1, resolder the connection point or replace "IC10" of CPU. )

2-2-3. Procedure Repair 2

1) Visually check on the Main P.C.Board.

( For example, cold solder and surface flaw. )

2) Check the data bus line and the address line of CPU. If there are a problem signals at the

line, find out the reason and change the problem IC. (The each signal should be a digital signal

like a following pulse wave form. If you see the voltage level is not +5V or 0V, find out the

problem IC to follow the line. For example, change the IC7 of SN74LV374 address latch.)

CPU Data bus D0 line wave form

CPU clock X1

VDD +5V

CPU clock X1

GND 0V

- 7 -

Trouble shooting ECR V1.01

Data bus

Data bus line D0