RZ 390 H-errors

[Artsmith]

Can anyone tell me why a Riso RZ 390 shows H errors every time it's switched on? It asks for the whole set, 1 through 6, and then sometimes then it still doesn't want to print. I've used two different inks -- one with and one without the chip. Any thoughts?

Thanks

[Kopyrtek]

May have a bad board in the drum.Can you swap drums to see?Sounds like it is not reading the RF tag from the ink.

[20gaugeO/U]

Reseat connectors on drum PCB and reset Test Mode 117 (Drum Memory Clear) and TM 890 (RF Tag Data)

A long while back we recieved a bad shipment of ink. The RF tags on the ink would randomly fail. New tube, mid tube whenever. You could take the tube to a different machine and it would code out.