I have more details after tracing the communication: The error comes from dj3320.cpp, line 2928 (bCreditInitialized == 0) because UpdateState(TRUE) above never returns TRUE. I traced UpdateState and the error comes from GetPackets(...) == 0 I do not know the LDL protocol but there is something wrong with the printer sometimes. What can I do? Martin
-----Original Message----- From: Martin Kajdas Sent: Friday, August 31, 2007 8:41 AM To: 'Suffield, David' Cc: hplip-devel@lists.sourceforge.net Subject: RE: [HPLIP-Devel] Print errors and hangs using HPIJS with HP DJ4160 Dave, Thanks for the excellent tip. I added similar code to my program and I believe it fixed the problem with the bottom of the page being corrupted. I wait for the printer to go idle before I close USB. However, the problem with SYSTEM_ERROR still occurs and I will give you some more info: 1. Never happens after power up (always works OK) 2. Seems to happen when I start a new job right after another print job. After the previous job, the printer is still doing some head movement and cleaning (?) for a while but its status says it is idle. 3. Querying ID works without a problem, I can get status and ink levels, the error happens only when I try to write bulk (print) data. 4. The error happens because printer is not responding (to bulk data) and timeout occurs (see #3, it responds to querying) 5. Pressing X button on the front panel fixes the problem 6. Sometimes, retrying the print job also makes it work It seems that the printer goes into some kind of error mode and does not accept print data. Querying always works OK. Any ideas, Martin ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ HPLIP-Devel mailing list HPLIP-Devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hplip-devel
