IBM Wheelwriters Service Manual

The Wheelwriter Service Manual, Second Edition (November 1994). 300 pages.

The copyright is Lexmark's, not IBM's. The edition notice names Lexmark International, Inc. — IBM sold its typewriter and low-end printer business to Lexmark in 1991, and by this edition the Wheelwriter was a Lexmark product carrying the IBM name. Cite it as a Lexmark publication.

It covers the whole Wheelwriter range: Wheelwriter 10, 15, 1500 and 3000; 30, 35 and 3500; and 50, 70, 5000 and 7000.

What it contains

• General Information and Tools and Test Equipment.
• Diagnostic Information (2-1) — a long series of numbered MAPs (maintenance analysis procedures), each a decision tree:
  • MAP 0100 Start; MAP 0110 Battery Backup; MAP 0120 CRT Display (WW 50, 70, 5000, 7000); MAP 0130 Diskette Option; MAP 0140 Display (WW 30, 35, 3500); MAP 0150 and 0160 End-of-Ribbon Sensor, mechanical and electrical.
  • MAP 0170 Error Codes — with three separate code tables, one for the 10/15/1500/3000, one for the 30/35/3500 and one for the 50/70/5000/7000.
  • MAP 0180 Fuse F1 (+5 V); MAP 0190 Carrier Homing Sensor; MAP 0200 and 0210 Printwheel Homing Sensor, given separately for single-board and two-board machines; MAP 0220 Indicator Panel; MAP 0240 Incomplete Power On Reset; MAP 0250 Intermittent Failure; MAP 0260 Keyboard; MAPs 0270 to 0300 Machine Electronics and Machine Inoperative, again split by model group.
• Safety information in several languages, repair information, adjustments and a parts catalogue.

What it does not contain

Module level. The MAPs isolate to a FRU — a board, a motor, a sensor, a cable — and the parts catalogue lists FRU numbers. There is no schematic and no component-level parts list. The single named component in the whole diagnostic section is fuse F1 on the +5 V rail, in MAP 0180.

What it settles

• Single-board and two-board machines are genuinely different and IBM/Lexmark gives them separate MAPs for the printwheel homing sensor and the machine electronics. Establish which you have before following a procedure.
• Three different error code tables apply to the three model groups. A code looked up in the wrong table will send you to the wrong FRU.
• MAP 0180 names fuse F1 as the +5 V protection — the one component-level fact in the book, and the first thing to check on a completely dead machine.

Download it here: IBM Wheelwriters Service Manual.pdf

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