Casio CE-7000 Handleiding voor probleemoplossing - Pagina 8

Blader online of download pdf Handleiding voor probleemoplossing voor {categorie_naam} Casio CE-7000. Casio CE-7000 19 pagina's.

Trouble shooting ECR V1.01

3) Check the poor connection between CPU and RAM or Flash ROM1.

Specially, check the Flash ROM1 connection to re-solder the all lines.

4) Check the RAM1 or Flash ROM1 chip enable signal.

5) If the signals of the address bus and the data bus are not stable (Ex: After some time,

the all signal becomes GND level or so on.), replace "IC10" of the CPU to new one.

[ Flash ROM1 chip enable signal ]

Flash RST

Flash ROM1 chip enable

Flash1 CE

Flash ROM1 chip enable signal

Flash ROM1 IC6

Flash ROM1 pin No.9

Address bus

Flash ROM1 chip enable

Pin No.3 of IC25 (74LV00)

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