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IBM Wheelwriters Service Manual

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Revision as of 22:53, 30 September 2026 by Josh (talk | contribs) (Rewrite from the manual: covers Wheelwriter 10-7000 in three groups, not the whole range; no parts catalogue (page claimed one); MAPs run to 0590, not 0300; F1 is not the only named component; add back-cover P/N 1364752 / SA40-0773-01, power supply levels (2-166), backup battery limits (2-16))
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The IBM Wheelwriters Service Manual is Lexmark's service manual for the IBM Wheelwriter electronic typewriters, Second Edition (November 1994). The back cover gives P/N 1364752, order number SA40-0773-01, E.C. 534847, printed in the USA in December 1994. The PDF has 300 pages, from the cover to the back cover. It is a photocopy scan with an OCR text layer (OCRmyPDF), so the searchable text is unreliable for figures; check values against the page image.

The edition notice is Lexmark's: "© Copyright Lexmark International, Inc. 1989, 1992", with comments to Lexmark in Lexington, Kentucky, and the statement that IBM and Wheelwriter are IBM trademarks "used under license".

The manual covers eleven models in three groups, and many procedures are split by group:

  • Wheelwriter 10, 15, 1500 and 3000
  • Wheelwriter 30, 35 and 3500
  • Wheelwriter 50, 70, 5000 and 7000

It also separates single-board machines from two-board machines, and gives the two-board Wheelwriter 10 its own steps in some procedures. The earlier Wheelwriter 3, 5 and 6 are not covered.

Contents

Page numbers are the manual's own, by chapter.

  • Safety information in English, German, French, Italian, Spanish and Danish (front matter).
  • Chapter 1, General information (pp. 1-1 to 1-2): how to use the MAPs and matrix diagnostics; tools and test equipment with IBM part numbers (p. 1-3).
  • Chapter 2, Diagnostic information (pp. 2-1 to 2-241): maintenance analysis procedures from MAP 0100 Start (2-4) to MAP 0590 Transport Electrical (2-224). They include battery backup (MAP 0110, 2-16), the CRT display of the 50, 70, 5000 and 7000 (0120), diskette option (0130), the display of the 30, 35 and 3500 (0140), end-of-ribbon sensor (0150-0160), error codes with a separate table for each model group (MAP 0170, 2-48 to 2-51), fuse F1 (+5 V) (0180, 2-54), carrier and printwheel homing sensors (0190-0210), keyboard (0260), machine electronics and machine inoperative by model group (0270-0320), memory expansion for the Wheelwriter 30 (0330), out-of-paper sensor, paperfeed, pinwheel form feeder, power supply (MAP 0420, 2-166), primary fuse by model (0430-0450, 2-170 to 2-176), print hammer, print quality, printer option, ribbon and correcting tape, semi-automatic paper insertion, selection, sheetfeed, spell check and transport. Diagnostic aids (2-227 to 2-241) follow: printwheel hole code chart, keyboard identification hole charts, keyboard country ID modification, power-on reset sequences, play-in-loop tests, sensor and switch tests and diskette diagnostic tests.
  • Chapter 3, Repair information (pp. 3-1 to 3-27): adjustments (3-2 to 3-9), including ribbon lift settings for Thai, Arabic and Farsi printwheels (3-6); removal procedures (3-10 to 3-26); handling ESD-sensitive parts (3-27).
  • Chapter 4, Parts/test point locations (pp. 4-1 to 4-7): boards, connectors, pin numbers and test points.
  • Chapter 5, Preventive maintenance (p. 5-1): the lubrication guide.
  • Chapter 6, Safety inspection guide (p. 6-1).
  • Index (from p. X-1).

What this manual does not contain

There is no parts catalogue. Chapter 4 shows where boards, connectors and test points are, and part numbers appear only for tools (p. 1-3) and a few items named in the MAPs. There are no schematics and no component values. The MAPs isolate a fault to a board, plug-in module, motor, sensor, cable or fuse using connector voltages and resistance checks.

What it settles

The power supply MAP (2-166) says there are three levels of Wheelwriter power supply. Level one has the primary fuse in an external removable fuse holder and fuse F1 (+5 V) on the regulator board. Level two has the primary fuse inside the switch tower and no F1. Level three has no replaceable fuses. MAP 0180 (2-54) for a blowing F1 therefore applies only to level-one supplies.

The memory backup batteries plug into J7 on the function or system board of single-board machines and the two-board Wheelwriter 10, and into J4 on the function board of other two-board machines. Measured from pin 1 (red) to pin 3 (black), a two-battery machine should read 2.3 to 3.2 V dc and a three-battery machine 3 to 5 V dc. Memory is lost if the batteries are disconnected while the machine is switched off (MAP 0110, 2-16).

Sheetfeed operation needs ROS module U10 on the printer option board: P/N 1432213 on the Wheelwriter 10, 15, 1500 and 3000, and P/N 1432209 on the other models (MAP 0550, 2-209). Print can be lightened by adding up to two hammer solenoid shims (P/N 1342475) or darkened by removing them (MAP 0470, 2-184).

The error code tables (2-48 to 2-51) differ between the three model groups, so look a code up in the table for the machine being serviced.

The lubrication guide (5-1) lists IBM No. 10 oil and No. 23 grease by lubrication point and says not to lubricate the homing LED area, the print hammer's printwheel contact surface or the transport belt, and that cleaning fluids damage the covers. It gives no service interval.

Download: IBM Wheelwriters Service Manual.pdf

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