Casio SF-8350 Service Manual & Parts List page 31

2
Connection of keyboard cable OK?
Yes
When press power on Key, any
oscillation at oscillator?
Yes
Pin 45 ofµPD3055GF002-2BA "H" ?
Yes
Pin 29 of µPD65005G-452-22 "H" ?
Yes
Pin 30 of µPD65005G-452-22 "H" ?
Yes
No
Pin 31 of SC371015FU "H" ?
Yes
Pin 35 of µPD65005G-452-22 "L" ?
Yes
No
Pin 3 of transistor Q1 "H" ?
Yes
Pin 32 of ROM µPD23C4001EGBW-301 "+4.5V" ?
Yes
Pin 22 of ROM µPD23C4001EGBW-
301 "Pulse" ?
Yes
Poor connection on ROM, RAM or CPU ?
No
No
Adjust keyboard cable.
No
Poor connection
on oscillator?
No
No
Poor connection?
No
No
No
Poor connection?
No
Poor connection?
No
Poor connection?
No
Poor connection?
No
No
No
Poor connection
on ROM or CPU?
No
Yes
Replace ROM, RAM or CPU.
— 30 —
Yes
Solder line
Replace parts.
Yes
Solder line
Replace parts.
Solder line
Yes
Solder line
Replace parts.
Solder line
Yes
Solder line
Replace parts.
Yes
Solder line
Replace parts.
Solder line
Yes
Solder line
Replace CPU.
Solder line
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1
1
1
1
1
1
1
1
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