Lexmark E238 Service Manual - Page 129

4511-xxx Parallel port service check (models E238, E240, and E240n) 1. Perform a print test to make sure the printer prints correctly. Verify is on, then press to print menu settings. 2. Be sure the printer cable is designed for bidirectional printing. 3. Be sure the user's application is set up correctly. 4. If the internal print test page prints correctly, the user's application/ printer driver is set up correctly, and the correct bidirectional parallel cable is installed, but the printer still fails to print on command from the host computer, replace the controller card. Parallel port service check (models E340 and E342) 1. Perform a print test to make sure the printer prints correctly. See "Print quality pages (Prt Quality Pgs)" on page 3-23. 2. Be sure the printer cable is designed for bidirectional printing. 3. Be sure the user's application is set up correctly. 4. Using an extra long parallel cable may require some adjustment in the Par S strobe. See "Parallel strobe adjustment (Par S Strobe Adj)" on page 3-30. 5. Some computers assume the printer samples data on the trailing edge of the strobe. This printer samples data on the leading edge by default. This process can be switched by turning Parallel Mode 2 off. To change this setting: a. Select PARALLEL MENU from the Ready Menu. b. Select Parallel Mode 2. Selections are On and Off. 6. If the printer fails to print on command from the host, verify the following: a. Internal print test page prints correctly. b. The user application/printer driver is set up correctly. c. The host computer has been restarted. d. The bidirectional parallel cable is connected correctly and is functional. If the printer still fails to print correctly, replace the controller card assembly. Note: Always check printhead alignment after replacing the controller card assembly. Diagnostics-all models 2-97