SER FAQ: PRINTFAQ: Ribbon does not advance after replacing flex-cable

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Printer and Photocopier Troubleshooting and Repair Collection : Ribbon does not advance after replacing ..
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Ribbon does not advance after replacing flex-cable

Have you actually confirmed that your 'new' ribbon cables are making proper contact - with an ohmmeter? Assuming that the thing worked better before the cables were cut, then there are only two possibilities: your replacements aren't quite right or something was damaged by the 'event' or through later actions.