1990 Elna PRO-5 DC & DE Overlock Sewing Machines Instruction Manual (P/N 4650)

Elna's October 1990 instruction manual, P/N 4650, covers the PRO-5 DC Computer and PRO-5 DE Electronic overlock sewing machines. The text is in English and French.

Text search and navigation: PDF text search and embedded bookmarks are not available. The printed contents and alphabetical index provide page references.

• Threading and stitch setup: Upper and lower loopers, overlock and chain stitch needles, and chain stitch looper threading for 2-, 3-, 4- and 5-thread configurations.

• Needles and stitch formation: Needle-plate changes, ELx705 ZWI twin-needle setup, rolled-hem foot selection and thread-tension adjustment for the selected stitch.

• Fabric feeding and cutting: Differential feed, presser-foot pressure, blade engagement and cutting-width adjustment, including moving-blade holder settings for extra-heavy fabrics.

• DC computer display: Stitch selection, reprogramming displayed setup figures, memory behavior and restoring factory settings for the PRO-5 DC.

• Routine maintenance: Cleaning, oiling, moving-blade replacement and separate light-bulb replacement instructions for the DC and DE models.

• Fault finding: Illustrated tension checks and page-referenced causes of skipped stitches, thread breakage, jamming, needle breakage and poor cutting.

With explanations of the controls, threading and basic sewing operations, this manual is suited to owners learning to use these machines and handle the routine maintenance described.

Threading, Needle Plates and Stitch Setup

Color-coded thread-path illustrations cover 3-thread overlock and straight double chain stitch; these combine to form the 5-thread safety stitch. The Stitch Selection Chart links each configuration to needle position, plate, presser foot and fixed-blade position, helping you match the hardware to the selected stitch.

Plate A handles standard and twin-needle overlocking, plate B provides the narrower overlock setup, and plate C works with rolled-hem foot B. Decorative topstitching (flatlock), pin-tucks and edge-to-edge sewing are covered, along with corners and curved edges.

Both ELx705 and household 130/705 H (15x1) needles are permitted; ELx705 is recommended. The 4-thread setup specifically requires an ELx705 ZWI twin needle. The fault guide identifies an incorrect twin needle or mismatched plate and foot as causes of needle breakage.

Fabric Settings and PRO-5 DC Display

The Fabrics, Stitches, Threads, Needles and Machine Settings tables connect woven and knitted fabrics with thread selection, needle choice, stitch length, differential feed and tension settings. Cutting-width indicator views and seam illustrations show how the cut edge relates to stitch formation.

The Computer Display Sewing Guide explains the DC model's ten stored programs and changes to the displayed stitch-length, differential-feed and tension figures. These are setup references: the machine's controls still need to be set to match them.

Screen illustrations cover custom entries and factory reset. Changed figures remain in memory for about a week with the machine switched off.

Maintenance, Fault Finding and Repair Limits

The maintenance section covers moving-blade alignment relative to the fixed blade, lint removal and oiling points. The accessory list identifies the blade-replacement wrench as 396 001-13.

The upper looper release lever is explained for chain-stitch-only sewing, with a warning against operating it while the machine is running.

Causes of and Remedies for Minor Disorders spans two pages and ties each symptom to page references. For skipped stitches or jamming, it directs the reader to threading, tension, needle-plate and feed checks before a repair is considered.

The cutter-off troubleshooting entry also identifies fabric interfering with looper movement as a cause of needle breakage.

This is an instruction manual with routine maintenance and operator troubleshooting coverage; motor repair, circuit-board diagnosis and internal timing procedures are outside its scope.

Always disconnect the machine from power before performing needle changes, threading procedures, or internal maintenance.

Bilingual PDF and Included Pages

Supplied as one printable PDF. The 44-page PDF includes the 41 numbered manual pages, front and back covers, and one blank inside-cover page.