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For printing to work, the LP scheduler must be running on both the print server and print clients. In addition to the scheduler running, a printer must be enabled and accepting requests before it can produce output. If the LP print service is not accepting requests for a printer, the submitted jobs (print requests) are rejected. Usually, in that instance, the user receives a warning message when a job is submitted. If the LP print service is not enabled for a printer, jobs remain queued on the system until the printer is enabled. In general, analyze a printing problem as follows:
Following are a couple other questions to ask:
The print scheduler must be running both on the print server and on each print client system. On the print server and on each print client, type lpstat -r and press Return. Check the output of the command to make sure that the LP print service is running.
elm% lpstat -r scheduler is running elm%
If the scheduler is not running, become superuser, type /usr/lib/lp/lpsched, and press Return.
You must enable printers and tell them to accept print requests.
Follow these steps both on the print server and on each print client to make sure that the printer is enabled and is accepting print requests:
elm% lpstat -a oak accepting requests since Wed Mar 13 20:37:07 PST 1991 pinecone not accepting requests since Wed Apr 17 19:10:55 PDT 1991 unknown reason elm%
elm% lpstat -p pinecone printer pinecone disabled since Wed Apr 17 19:13:33 PDT 1991. available. unknown reason elm%
pine% su Password: # enable pinecone printer "pinecone" now enabled. #
Make sure that the cable is connected to the port that the LP print service is using. To find out which port is configured for the LP print service, type lpstat -t on the print server and press Return. In the following example, the printer is connected to /dev/term/a.
elm% lpstat -t scheduler is running system default destination: pinecone device for pinecone: /dev/term/a elm%
If the cable is connected to the right port, type ls -l /devices and press Return to check whether the device is owned by lp and that the permissions are set to 600. In the following example, the port is configured correctly.
oak% ls -l /devices total 12 crw-rw-rw- 1 root sys 28, Ø Mar 24 1Ø:22 audio@1,f72Ø1ØØØ:sound,audio crw-rw-rw- 1 root sys 28,128 Mar 24 1Ø:22 audio@1,f72Ø1ØØØ:sound, audioctl crw---- 1 root sys 68, 11 Mar 24 Ø9:39 eeprom@1,f2ØØØØØØ:eeprom brw-rw-rw- 1 root sys 36, Ø Mar 24 Ø9:39 fd@1,f72ØØØØØ:a crw-rw-rw- 1 root sys 36, Ø Mar 24 Ø9:39 fd@1,f72ØØØØØ:a,raw brw-rw-rw- 1 root sys 36, 1 Mar 24 Ø9:39 fd@1,f72ØØØØØ:b crw-rw-rw- 1 root sys 36, 1 Mar 24 Ø;9:39 fd@1,f72ØØØØØ:b,raw brw-rw-rw- 1 root sys 36, 2 Mar 24 Ø9:39 fd@1,f72ØØØØØ:c crw-rw-rw- 1 root sys 36, 2 Mar 24 Ø9:39 fd@1,f72ØØØØØ:c,raw drwxr-xr-x 2 root sys 46Ø8 Mar 24 1Ø:22 pseudo drwxr-xr-x 3 root sys 512 Mar 24 11:41 sbus@1,f8ØØØØØØ crw---- 1 lp sys 29, Ø Mar 24 Ø9:39 zs@1,f1ØØØØØØ:a crw-rw-rw- 1 root sys 29,131Ø72 Mar 24 Ø9:39 zs@1,f1ØØØØØØ:a,cu crw-rw-rw- 1 root sys 29, 1 Mar 24 Ø9:39 zs@1,f1ØØØØØØ:b crw-rw-rw- 1 root sys 29,131Ø73 Mar 24 Ø9:39 zs@1,f1ØØØØØØ:b,cu oak%
If you are not certain which device is the serial port, you can type ls -l/dev/term and press Return to display the link to the /devices file.
oak% ls -l/dev/term total 4 lrwxrwxrwx 1 root root 29 Mar 24 1Ø:23 a -> ../../devices/zs@1,flØØØØØØ:a lrwxrwxrwx 1 root root 29 Mar 24 1Ø:23 b -> ../../devices/zs@;1,flØØØØØØ:b oak%
Use the following steps if you need to change the ownership or permissions for the device:
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