According to the Service Manual for that printer ...

--- (Quote) ---
A printer command error occurred, which indicates a problem between
the Formatter PCA and the print engine.
xx = error code:
01 =Unable to bring up the engine
02 =Excessive noise glitches on the Printer Ready signal (PPRDY)
03 =Printer Ready signal (PPRDY) was lost
04 =No response to a signal communicate request
05 =Engine reporting different source and/or destination than was
selected by the Formatter PCA
06 =Unable to synchronize the engine serial communications
07 =Serial receive parity error
08 =Serial transmit parity error
09 =Missed a serial communication interrupt
10 =Serial communication is hung
11 =Lost a serial communication extended interrupt request (XISR)
12 =Invalid communication timeout error
13 =Serial communication delayed

Recommended Action:
Cycle power. If the error continues, check the Formatter seating into
DC Controller. Ensure no pins are bent. Reseat or replace the cable
from the DC Controller and the Laser/Scanner Assembly. Replace the
Laser/Scanner Assembly. Replace the DC Controller PCA. Replace the
Formatter PCA. Note: These connections may appear to be correct, but
if the problem persists, reseat cable connections making sure they are
properly connected.
--- (End Quote) ---

Hope that helps?
- Paul L.


--- In printerrepair@yahoogroups.com, Derik Cree <dcree33@...> wrote:
>
> Esteemed Colleagues,
>  
> I have a perplexing problem with a Hp5si. It seems to keep dropping
communication or something. It will print fine for the first few jobs
after it gets turned on and then it will get stuck in a processing
job mode and do nothing 'till it gets rebooted. I have tried a
different jetdirect card and another formatter with no luck. To make
matters worse after the formatter swap, it will now stay in the ready
mode but just not print until a reboot is done, but the jobs go
through the queue like they make it to the printer so when you reboot
any jobs sent while it was stuck in limbo are lost. I have never seen
such an issue and it's becoming quite confusing, has anyone else ran
into this? I did notice a 50.03 error a couple thousand pages ago on
the error log so I was thinking of swapping out the fuser and
removing the duplexer just to see if that helps, although I did try
removing the duplexer before the JD card swap and that didn't seem to
make any
> difference. Basically I am just pulling at straws at this
point........The last 2 errors in the log were 55.03F1 and 55.032A,
the 55 errors seems to point to a communications problem. I could
also try the DC Controller? Any help would be appreciated, and I
thank you in advance.......
>  
> Derik
>
>
>
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