C7911 C7912 C1950

[outdoorkatie123]

Hi was wondering if anyone could help im getting intermittent eprom errors on a Utax 3206 c7911 c7912 and c1950 the errors are probably only happening once a week
iv'e replaced the feed image PCB but still happening
thanks in advance

[PrintWhisperer]

TA-3552ci equivalent AFAIK

The Feed Image PWB is the first single point of failure for these 2 EEPROM Serial Data (SDA) branches, so it was a good shot.

The C791x EEPROM data comes from the Drum/Developer Relay PWB, and that is the next thing to try. It has a Serial control chip on the back that can fail, but be sure to check for bent pins on the drum/DV connectors and damaged sockets.

The Transfer EEPROM data (C1950) has a different path via the Transfer Connect PWB, but that is a simple wiring connection with no control chips. Look for broken or cracked board.

However the EEPROM Serial Data loop includes a connected system which can cause various codes indicating parts not directly related to the PWB which has failed.

Ultimately it all leads back to the Engine PWB which may have an issue, and a usual cause could be disconnecting parts with the power on, so ensure no one is doing that.

Good Luck

[KYO_OEM]

For further analysis you must be on site when the error is displayed on the screen.
e.g.
system shows C7911 or C7912
no shut down/ restart by the endcustomer
you has to check all other dv units by U157/ U158 or U984 at first
2nd step will be checking from U110/ U117
3rd step will be U122 and U127

Same for C1950.
You has to check all the other data from dv- and dk units.

In past i have had 2 dv units with same serial number or missing from all other serialnumbers.
System showed C791x but also no dk units visible.

Maybe by using this way you can see if it`s coming from pcb or component