How about a P02 Error? Is that basically the same jam error or something else?

I found an error code list for the Riso SF5030 on printcopy.info. According to the list, error code P02-400 indicates that the master positioning sensor is not turned ON at master setting/cutting or at master making even after master has been transferred. The suggested remedy is to turn the Master making unit upper cover set switch from OFF to ON, and turn the Master positioning sensor OFF to reset the master and cancel the error.

check the link

https://www.google.com/search?q=Riso+Error+code+P02-402&

..

Carriage error

something is preventing movement of the carriage

or encoder film is dirty

Please refer this page on canon website for possible reasons for error P02.

http://www.usa.canon.com/cusa/support/consumer/printers_multifunction/pixma_mg_series/pixma_mg2120?CMD=MIXED_SEARCH&mName=PIXMA+MG2120&mType=PIXMA+MG&pageKeyCode=ekbresults&searchString=error+p02&BASIC_SEARCH_CURRENT_TOPIC_ID=2259&BASIC_SEARCH_CURRENT_TOPIC_TYPE=0&RESULTS=RELEVANCE&RELEVANCE_START=1&RELEVANCE_COUNT=25&CONFIGURATION=1011&PARTITION_ID=1&TIMEZONE_OFFSET=null&USERTYPE=1&isSecure=false

I short video to attempt a fix is shown on this site
http://www.youtube.com/watch?v=JCMrI8HZPKw

Hi Andrey,
Did you mean P02?. If yes, means that carriage error occurs on your printer. This error is another format of error code 5100. It describes the same thing that applicable for all Canon inkjet printer model.
I hope the following link would be useful for you. Thanks.


Error Code 5100

Riso Cz 180 Model
Code error :- P02-400

error 5100

There are some good videos here on how to fix this issue

http://www.youtube.com/watch?v=JCMrI8HZPKw&feature=relmfu

Error P02-405 means: The upper-limit sensor does not go ON within 12 seconds after the elevator motor operates in the raising direction.