IBM 4247-003 Maintenance Manual - Page 146

Reference Table 3, No Printed Characters Failure: No printed characters appear Action No print from any source (host or print test). If there is no carriage motion: v See "MAP 0140: Printhead Drive" on page 70. v See "MAP 0150: Power Supply" on page 75. If there is carriage motion: 1. Check that the ribbon is seated correctly. 2. See "Standard AFTA Service Check and Adjustment" on page 285. 3. See "MAP 0160: Ribbon Feed and Ribbon Lift" on page 89. Models A00, 003; no print from serial, parallel, or both attachments, but print test is OK. See "MAP 0120: Parallel or Serial Attachment, Model A00 and Model 003" on page 33. For all models, no print from parallel with coax, twinax, or parallel See "MAP 0121: Parallel with Twinax or Coax Attachments, attachments, but printer demonstration is OK. Models 001, 002, or 003" on page 41. For all models, no print from network print server attachment, but See "MAP 0122: Network Print Server Attachment" on page 59. printer demonstration is OK. Print test starts to print one line, then printer hangs. See "MAP 0140: Printhead Drive" on page 70. Reference Table 4, Print Quality Failures Print Quality Failures (Darkness, Location, Quality) Print density varies, or is too light or too dark. Action Note: Impact Strength may not be available on your printer. 1. If the problem is print too dark, check the Impact Strength (Soft or Strong). If set to Strong, change to Soft. Refer to A00 Program Configuration Setup in the 4247 User's Guide. 2. See "MAP 0160: Ribbon Feed and Ribbon Lift" on page 89. 3. See "Print Quality Checks" on page 338. Chapter 1. Diagnosing Problems 146