Question about Canon CanoScan 8400F Flatbed Scanner
If power supply is new, check the power inverter/conveter to make sure it is transfering the 12 volts to the usual voltage which is around 5 volts to each capacitor and resistor.
Check for any swollen capacitors or burn marks on the system board. Many of these do have an internal fuse that is located next to the power supply where it attaches to the main circuit board.
Posted on Sep 01, 2010
In fact since the adaptor was faulty , when you replaced I hope the power supply used is of the same rating. Hope there was no mix up of the polarity of the DC pin to the scanner.
Now the input can show up a resistance and open up but if you reverse the probes a reading can come up. This is because there is a diode/regulator combination at the input end as a protector. So if the earlier adaptor had failed in high voltage it could have shorted the protection zener diode.
But to have a first hand infomation it is important to open the scanner to look inside.
You can open the rear and get access to checck out the board for inline fusible resistor that would hve opened out or a regulator. If only you dont tamper but to havea good look and check only itmes you understand.
If with warrant take help from the link below or even without warranty you can clarify more.
You can get full suport from Canon , call for clarification:
Posted on Sep 01, 2010
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Posted on Jan 02, 2017
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