{"id":29056,"date":"2026-09-01T16:52:45","date_gmt":"2026-09-01T11:22:45","guid":{"rendered":"https:\/\/stitchpartner.com\/?post_type=product&#038;p=29056"},"modified":"2026-09-03T13:44:55","modified_gmt":"2026-09-03T08:14:55","slug":"jack-781g-main-pcb-control-board-19950020300","status":"publish","type":"product","link":"https:\/\/stitchpartner.com\/hi\/product\/jack-781g-main-pcb-control-board-19950020300\/","title":{"rendered":"Jack 781G Main PCB Control Board 19950020300"},"content":{"rendered":"<h2 class=\"PDq2pG_selectionAnchorContainer\" data-section-id=\"1a5zxmg\" data-start=\"92\" data-end=\"127\">Jack 781G Main PCB Control Board<\/h2>\n<p class=\"isSelectedEnd\">The <strong>Jack 781G PCB Main Board 19950020300<\/strong> is the main electronic control board used in compatible Jack 781 and 781G buttonhole sewing machines. It is designed to manage important machine-control functions and provides a practical replacement when the original circuit board is damaged or no longer operating correctly.<\/p>\n<p class=\"isSelectedEnd\">This replacement board is specified for the <a href=\"https:\/\/stitchpartner.com\/hi\/product-category\/jack-sewing-machine-spare-parts\/jk-781-jk-t781d-spare-parts\/\"><strong>Jack 781 \/ Jack 781G series industrial buttonhole sewing machines<\/strong><\/a>, with <strong>Part No. 19950020300<\/strong>. Before ordering, compare the part number, board layout, connectors, and existing PCB with the product shown.<\/p>\n<h2>What This Jack 781G PCB Does<\/h2>\n<p class=\"isSelectedEnd\">The main PCB acts as the electronic control center of the sewing machine. It coordinates machine functions such as motor operation, needle positioning, cycle timing, and the programmed buttonhole sewing sequence.<\/p>\n<p>A faulty control board can affect normal machine operation and may require replacement rather than adjustment of mechanical components. Installing the correct PCB helps restore the electronic control system without replacing the complete buttonhole machine.<\/p>\n<h3 class=\"PDq2pG_selectionAnchorContainer\" data-section-id=\"1iz91iu\" data-start=\"848\" data-end=\"864\">\u092a\u094d\u0930\u092e\u0941\u0916 \u0935\u093f\u0936\u0947\u0937\u0924\u093e\u0910\u0902<\/h3>\n<ul data-start=\"866\" data-end=\"1371\">\n<li data-section-id=\"ir7gq6\" data-start=\"866\" data-end=\"948\">Main electronic control PCB for <strong data-start=\"900\" data-end=\"948\">Jack 781\/781G industrial buttonhole machines<\/strong><\/li>\n<li data-section-id=\"1xcam6q\" data-start=\"949\" data-end=\"990\"><strong data-start=\"951\" data-end=\"990\">Part No. 19950020300, Version V1.08<\/strong><\/li>\n<li data-section-id=\"1nckba\" data-start=\"991\" data-end=\"1055\">Precision electronic control for coordinated machine operation<\/li>\n<li data-section-id=\"ijnop0\" data-start=\"1056\" data-end=\"1133\">Controls timing between the motor, sensors, solenoids and machine functions<\/li>\n<li data-section-id=\"13kc40\" data-start=\"1134\" data-end=\"1201\">Factory-matched board layout for the specified control-box wiring<\/li>\n<li data-section-id=\"1s9h8v5\" data-start=\"1202\" data-end=\"1264\">Standard plug connectors support straightforward replacement<\/li>\n<li data-section-id=\"dhg4ye\" data-start=\"1265\" data-end=\"1326\">Designed for continuous industrial sewing-machine operation<\/li>\n<li data-section-id=\"yo5o04\" data-start=\"1327\" data-end=\"1371\">Pack contains <strong data-start=\"1343\" data-end=\"1371\">1 main PCB control board<\/strong><\/li>\n<\/ul>\n<h3 data-section-id=\"1ag3vnm\" data-start=\"1373\" data-end=\"1386\">\u0909\u092a\u092f\u094b\u0917 \u0915\u0947 \u092e\u093e\u092e\u0932\u0947<\/h3>\n<p data-start=\"1388\" data-end=\"1710\">This main PCB is used when the original control board in a Jack 781G buttonhole machine needs replacement. It is suitable for garment factories, tailoring units, boutique production rooms, and machine-service workshops where restoring the machine&#8217;s electronic control is more practical than replacing the complete machine.<\/p>\n<p data-start=\"1712\" data-end=\"2041\">A properly matched control board is important because the buttonhole machine depends on coordinated electronic control for functions such as motor operation, positioning and programmed sewing sequences. The 781G itself uses integrated control and step-motor functions for machine operations.<\/p>\n<h3 data-section-id=\"5y7puq\" data-start=\"2043\" data-end=\"2055\">\u092b\u093c\u093e\u092f\u0926\u0947<\/h3>\n<ul data-start=\"2057\" data-end=\"2842\">\n<li data-section-id=\"14ayewb\" data-start=\"2057\" data-end=\"2168\"><strong data-start=\"2059\" data-end=\"2088\">Restores machine control:<\/strong> Replaces a faulty main electronic board without replacing the complete machine.<\/li>\n<li data-section-id=\"pv50vy\" data-start=\"2169\" data-end=\"2307\"><strong data-start=\"2171\" data-end=\"2204\">Correct board identification:<\/strong> The <strong data-start=\"2209\" data-end=\"2230\">19950020300 V1.08<\/strong> designation gives buyers a specific reference when matching the replacement.<\/li>\n<li data-section-id=\"1f4f91r\" data-start=\"2308\" data-end=\"2425\"><strong data-start=\"2310\" data-end=\"2339\">Stable machine operation:<\/strong> The board coordinates electronic signals required by the machine&#8217;s connected systems.<\/li>\n<li data-section-id=\"8seg7i\" data-start=\"2426\" data-end=\"2551\"><strong data-start=\"2428\" data-end=\"2451\">Faster replacement:<\/strong> The pre-configured PCB layout and plug connections simplify replacement for a qualified technician.<\/li>\n<li data-section-id=\"1ef6iru\" data-start=\"2552\" data-end=\"2685\"><strong data-start=\"2554\" data-end=\"2595\">Suitable for production environments:<\/strong> Designed as a machine-specific industrial spare rather than a generic sewing-machine PCB.<\/li>\n<li data-section-id=\"dyh9ng\" data-start=\"2686\" data-end=\"2842\"><strong data-start=\"2688\" data-end=\"2729\">Reduces unnecessary part replacement:<\/strong> Replacing the main board can address electronic-control faults without changing unrelated mechanical components.<\/li>\n<\/ul>\n<h3 data-section-id=\"tcc9pp\" data-start=\"2844\" data-end=\"2869\">\u092e\u0936\u0940\u0928 \u0905\u0928\u0941\u0915\u0942\u0932\u0924\u093e<\/h3>\n<p data-start=\"2871\" data-end=\"3012\"><strong data-start=\"2871\" data-end=\"3012\">Compatible with Jack 781 and Jack 781G series industrial buttonhole sewing machines using the 19950020300 V1.08 main-board configuration.<\/strong><\/p>\n<h3 data-section-id=\"1yl5694\" data-start=\"3280\" data-end=\"3298\">\u0935\u093f\u0936\u0947\u0937 \u0935\u093f\u0935\u0930\u0923<\/h3>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"3300\" data-end=\"3695\">\n<thead data-start=\"3300\" data-end=\"3327\">\n<tr data-start=\"3300\" data-end=\"3327\">\n<th class=\"last:pe-10\" data-start=\"3300\" data-end=\"3316\" data-col-size=\"sm\">\u0935\u093f\u0928\u093f\u0930\u094d\u0926\u0947\u0936<\/th>\n<th class=\"last:pe-10\" data-start=\"3316\" data-end=\"3327\" data-col-size=\"sm\">\u0935\u093f\u0935\u0930\u0923<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"3338\" data-end=\"3695\">\n<tr data-start=\"3338\" data-end=\"3379\">\n<td data-start=\"3338\" data-end=\"3353\" data-col-size=\"sm\">\u0909\u0924\u094d\u092a\u093e\u0926 \u0915\u093e \u092a\u094d\u0930\u0915\u093e\u0930<\/td>\n<td data-start=\"3353\" data-end=\"3379\" data-col-size=\"sm\">Main PCB Control Board<\/td>\n<\/tr>\n<tr data-start=\"3380\" data-end=\"3428\">\n<td data-start=\"3380\" data-end=\"3395\" data-col-size=\"sm\">\u092e\u0936\u0940\u0928 \u0915\u093e \u092a\u094d\u0930\u0915\u093e\u0930<\/td>\n<td data-start=\"3395\" data-end=\"3428\" data-col-size=\"sm\">Industrial Buttonhole Machine<\/td>\n<\/tr>\n<tr data-start=\"3429\" data-end=\"3469\">\n<td data-start=\"3429\" data-end=\"3450\" data-col-size=\"sm\">Compatible Machine<\/td>\n<td data-start=\"3450\" data-end=\"3469\" data-col-size=\"sm\">Jack 781 \/ 781G<\/td>\n<\/tr>\n<tr data-start=\"3470\" data-end=\"3499\">\n<td data-start=\"3470\" data-end=\"3484\" data-col-size=\"sm\">Part Number<\/td>\n<td data-start=\"3484\" data-end=\"3499\" data-col-size=\"sm\">19950020300<\/td>\n<\/tr>\n<tr data-start=\"3500\" data-end=\"3523\">\n<td data-start=\"3500\" data-end=\"3514\" data-col-size=\"sm\">PCB Version<\/td>\n<td data-start=\"3514\" data-end=\"3523\" data-col-size=\"sm\">V1.08<\/td>\n<\/tr>\n<tr data-start=\"3524\" data-end=\"3570\">\n<td data-start=\"3524\" data-end=\"3535\" data-col-size=\"sm\">\u0938\u092e\u093e\u0930\u094b\u0939<\/td>\n<td data-start=\"3535\" data-end=\"3570\" data-col-size=\"sm\">Main electronic machine control<\/td>\n<\/tr>\n<tr data-start=\"3571\" data-end=\"3613\">\n<td data-start=\"3571\" data-end=\"3586\" data-col-size=\"sm\">Installation<\/td>\n<td data-start=\"3586\" data-end=\"3613\" data-col-size=\"sm\">Control-box replacement<\/td>\n<\/tr>\n<tr data-start=\"3614\" data-end=\"3667\">\n<td data-start=\"3614\" data-end=\"3631\" data-col-size=\"sm\">Connector Type<\/td>\n<td data-start=\"3631\" data-end=\"3667\" data-col-size=\"sm\">Standard machine plug connectors<\/td>\n<\/tr>\n<tr data-start=\"3668\" data-end=\"3695\">\n<td data-start=\"3668\" data-end=\"3684\" data-col-size=\"sm\">\u092a\u0948\u0915 \u092e\u093e\u0924\u094d\u0930\u093e<\/td>\n<td data-start=\"3684\" data-end=\"3695\" data-col-size=\"sm\">1 \u091f\u0941\u0915\u0921\u093c\u093e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3 data-section-id=\"17h2msu\" data-start=\"3697\" data-end=\"3711\">\u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0915\u0948\u0938\u0947 \u0915\u0930\u0947\u0902<\/h3>\n<p data-start=\"3713\" data-end=\"3821\"><strong data-start=\"3713\" data-end=\"3722\">First<\/strong>, switch off the machine completely and disconnect the power supply before opening the control box.<\/p>\n<p data-start=\"3823\" data-end=\"3956\"><strong data-start=\"3823\" data-end=\"3831\">Next<\/strong>, photograph or mark the existing wiring and connector positions so each connection can be returned to its original location.<\/p>\n<p data-start=\"3958\" data-end=\"4163\"><strong data-start=\"3958\" data-end=\"3966\">Then<\/strong>, disconnect the old PCB, remove its mounting points, and install the replacement <strong data-start=\"4048\" data-end=\"4069\">19950020300 V1.08<\/strong> board in the same position. Reconnect each plug according to the original wiring arrangement.<\/p>\n<p data-start=\"4165\" data-end=\"4405\"><strong data-start=\"4165\" data-end=\"4176\">Finally<\/strong>, close the control box, inspect all connections, restore power, and test the machine&#8217;s basic functions before returning it to production. Electrical PCB replacement should be carried out by a qualified sewing-machine technician.<\/p>\n<h3 data-section-id=\"yn99c3\" data-start=\"4407\" data-end=\"4415\">\u092a\u0942\u091b\u0947 \u091c\u093e\u0928\u0947 \u0935\u093e\u0932\u0947 \u092a\u094d\u0930\u0936\u094d\u0928<\/h3>\n<h4 data-start=\"4417\" data-end=\"4483\">Is this PCB compatible with the Jack 781G buttonhole machine?<\/h4>\n<p data-start=\"4485\" data-end=\"4902\">Yes. This PCB is specified for the <strong data-start=\"4520\" data-end=\"4567\">Jack 781\/781G industrial buttonhole machine<\/strong> using the <strong data-start=\"4578\" data-end=\"4599\">19950020300 V1.08<\/strong> main-board configuration. Check the part number and board version against your existing PCB before ordering because different 781-series electronic boards are available. Current spare-parts listings also identify 19950020300 specifically with the 781G control box.<\/p>\n<h4 data-start=\"4904\" data-end=\"4955\">What is the part number of this Jack 781G PCB?<\/h4>\n<p data-start=\"4957\" data-end=\"5329\">The part number is <strong data-start=\"4976\" data-end=\"4991\">19950020300<\/strong>, with board version <strong data-start=\"5012\" data-end=\"5021\">V1.08<\/strong>. Matching the complete part number is more reliable than purchasing a PCB only because it is described as a \u201c781G board.\u201d Listings for 781G replacement boards show multiple PCB\/control-board products, so buyers should compare the existing board marking before purchase.<\/p>\n<h4 data-start=\"5331\" data-end=\"5389\">Does this replace the complete Jack 781G control box?<\/h4>\n<p data-start=\"5391\" data-end=\"5692\">No. This product is the <strong data-start=\"5415\" data-end=\"5441\">main PCB\/control board<\/strong>, not necessarily the complete external control-box assembly. It is intended to replace the electronic board inside the specified control-box system. Confirm that your existing control box, connectors and board configuration match before installation.<\/p>\n<h4 data-start=\"5694\" data-end=\"5728\">Can I install the PCB myself?<\/h4>\n<p data-start=\"5730\" data-end=\"6083\">PCB replacement should be performed by a qualified sewing-machine technician. The job requires disconnecting mains power, identifying the existing connectors, removing the old board and reconnecting the replacement correctly. Incorrect wiring can damage the PCB or other electronic components, so connector positions should be documented before removal.<\/p>\n<h4 data-start=\"6085\" data-end=\"6135\">What problems can indicate a faulty main PCB?<\/h4>\n<p data-start=\"6137\" data-end=\"6535\">Electronic faults can appear as abnormal machine operation, loss of motor\/control response, incorrect sequencing or failure of connected electronic functions. However, these symptoms can also come from wiring, sensors, power-supply components, switches or motors. A technician should diagnose the machine before replacing the main PCB rather than assuming every electronic fault is a board failure.<\/p>\n<h4 data-start=\"6537\" data-end=\"6595\">Does this PCB control the buttonhole sewing sequence?<\/h4>\n<p data-start=\"6597\" data-end=\"6903\">The main control system coordinates electronic machine functions and timing required for the buttonhole operation. Buttonhole machines use electronic control systems to coordinate sewing and associated functions, including machine positioning and auxiliary operations.<\/p>\n<h4 data-start=\"6905\" data-end=\"6955\">Is this the same as the Jack 781G Z-step PCB?<\/h4>\n<p data-start=\"6957\" data-end=\"7324\">Not necessarily. Current listings show separate 781G-related PCB products, including a <strong data-start=\"7044\" data-end=\"7063\">781G Z-step PCB<\/strong> and a PCB\/control-box board associated with <strong data-start=\"7108\" data-end=\"7123\">19950020300<\/strong>. These should not be treated as interchangeable simply because both mention 781G. Match the part number, board markings and connector arrangement before ordering.<\/p>\n<h4 data-start=\"7326\" data-end=\"7386\">Can a different 781-series PCB be used as a substitute?<\/h4>\n<p data-start=\"7388\" data-end=\"7712\">Do not substitute a different 781-series PCB without confirming compatibility. Spare-parts listings distinguish between boards for 781D, 781E and 781G machines, and even different boards are listed for 781G applications. The safest match is the same <strong data-start=\"7638\" data-end=\"7659\">19950020300 V1.08<\/strong> configuration.<\/p>\n<h4 data-start=\"7714\" data-end=\"7781\">Will replacing the PCB fix every Jack 781G electronic problem?<\/h4>\n<p data-start=\"7783\" data-end=\"8118\">No. A PCB replacement only addresses faults originating from the main control board. Problems caused by sensors, motors, wiring, connectors, power components, switches or other electronic assemblies require separate diagnosis. Have the complete electrical system checked if the machine continues to malfunction after board replacement.<\/p>","protected":false},"excerpt":{"rendered":"<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"8095\" data-end=\"8381\">Replace the main electronic control board of your compatible Jack 781\/781G buttonhole machine with the <strong data-start=\"9549\" data-end=\"9574\">19950020300 V1.08 PCB<\/strong>. Built for machine-specific electronic control, coordinated operation and straightforward control-box replacement. <strong data-start=\"8404\" data-end=\"8478\">Genuine\/original replacement part | COD Available | Pan-India Delivery<\/strong><\/p>","protected":false},"featured_media":29086,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_yoast_wpseo_focuskw":"Jack 781G Main PCB Control Board","_yoast_wpseo_title":"Jack 781G Main PCB Control Board 19950020300 %%sep%% %%sitename%%","_yoast_wpseo_metadesc":"Buy Jack 781G Main PCB Control Board 19950020300 for precise electronic control and reliable buttonhole sewing machine operation.","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_bctitle":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":""},"product_brand":[967],"product_cat":[765,793,1103],"product_tag":[3125,3126,3131,3127,3128,3124,3123,3129,3130,3132],"class_list":["post-29056","product","type-product","status-publish","has-post-thumbnail","product_brand-jack","product_cat-jack-sewing-machine-spare-parts","product_cat-jk-781-jk-t781d-spare-parts","product_cat-sewing-machine-motherboard-and-chip","product_tag-19950020300-pcb","product_tag-buttonhole-machine-pcb","product_tag-buttonhole-machine-spare-parts","product_tag-buttonhole-sewing-machine-parts","product_tag-industrial-sewing-machine-pcb","product_tag-jack-781-pcb","product_tag-jack-781g-pcb","product_tag-main-circuit-board","product_tag-sewing-machine-control-board","product_tag-sewing-machine-electronic-parts","first","instock","sale","shipping-taxable","purchasable","product-type-simple"],"acf":[],"pure_taxonomies":{"product_brand":[{"term_id":967,"name":"JACK","slug":"jack","term_group":0,"term_taxonomy_id":967,"taxonomy":"product_brand","description":"","parent":0,"count":60,"filter":"raw","image":""}],"product_cat":[{"term_id":765,"name":"JACK","slug":"jack-sewing-machine-spare-parts","term_group":0,"term_taxonomy_id":765,"taxonomy":"product_cat","description":"<h1>Jack Sewing Machine Spare Parts<\/h1>\n<p>Jack is one of the most widely used industrial sewing machine brands in Indian garment units, tailoring shops, and boutiques \u2014 known for energy-efficient direct-drive motors and computerized models like the F4, F5, and F6. Like any machine run for hours every day, a Jack sewing machine needs worn parts replaced to keep stitching consistent. StitchPartner stocks <strong>genuine and compatible Jack sewing machine spare parts<\/strong> organized by exact model series, with Pan-India delivery and Cash on Delivery on eligible orders.<\/p>\n\n<h2>Which Jack Model Do You Have?<\/h2>\n<p>Jack spare parts vary by model series, so start with the category that matches your machine's data plate:<\/p>\n<h3>Single Needle Lockstitch<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/jack-f4-f5-f6-spare-parts\/\">Jack F4 \/ F5 \/ F6 Spare Parts<\/a><\/strong> \u2014 our largest and most complete Jack range, including motherboard PCBs, presser feet, feed dogs, and full compatibility guidance.<\/li>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/9100-9100bp-9100bs-spare-parts\/\">9100 \/ 9100BP \/ 9100BS Spare Parts<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/a2-a2s-a3-a4-a5-spare-part\/\">A2 \/ A2S \/ A3 \/ A4 \/ A5 Spare Parts<\/a><\/strong><\/li>\n<\/ul>\n<h3>Overlock<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/jk-768-798-795-spare-parts\/\">JK-768 \/ 798 \/ 795 Spare Parts<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/e4-e4-5-spare-part\/\">E4 \/ E4-5 Spare Parts<\/a><\/strong><\/li>\n<\/ul>\n<h3>Flatlock \/ Interlock<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/jk-8558-jk-8560-jk-8560pl-spare-parts\/\">JK-8558 \/ JK-8560 \/ JK-8560PL Spare Parts<\/a><\/strong><\/li>\n<\/ul>\n<h3>Button Hole Machine<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/jk-781-jk-t781d-spare-parts\/\">JK-781 \/ JK-T781D Spare Parts<\/a><\/strong><\/li>\n<\/ul>\n<h3>Button Stitch Machine<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/jk-t9270-t9280-spare-parts\/\">JK-T9270 \/ T9280 Spare Parts<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/jk-t1377-372-373-spare-parts\/\">JK-T1377 \/ 372 \/ 373 Spare Parts<\/a><\/strong><\/li>\n<\/ul>\n<p>Not sure which one your machine is? The model number is stamped on the data plate, usually near the handwheel or on the machine arm \u2014 that's more reliable than going by memory or appearance, since several Jack models look similar from the outside.<\/p>\n\n<h2>Jack F4 \/ A4 \/ E4 Error Codes \u2014 What They Mean<\/h2>\n<p>Computerized Jack models display a numeric or letter error code on the control panel when something needs attention. These are the most common codes on Jack F4-series machines:<\/p>\n<ul>\n<li><strong>0F<\/strong> \u2014 The machine has gone into sleep\/standby mode after around 30 minutes of inactivity, or the input voltage is too low. Press \"+\" or \"\u2212\" to wake it; if it persists, check the power supply voltage.<\/li>\n<li><strong>E1<\/strong> \u2014 The motor plug has come loose or disconnected. Turn the machine off, reseat the motor connector firmly, and restart.<\/li>\n<li><strong>E2<\/strong> \u2014 Motor controller abnormal. Usually points to the motor controller or its wiring rather than the main motherboard; check connections before replacing a part.<\/li>\n<li><strong>E4<\/strong> \u2014 Needle position abnormal, typically a needle-position sensor or timing issue.<\/li>\n<li><strong>E5<\/strong> \u2014 Needle governor (speed sensor) abnormal.<\/li>\n<\/ul>\n<p>If an error persists after checking connections and restarting, the part to inspect is usually the motherboard PCB, the motor controller, or the relevant sensor \u2014 available in the <a href=\"https:\/\/stitchpartner.com\/product-category\/jack-sewing-machine-spare-parts\/jack-f4-f5-f6-spare-parts\/\">Jack F4\/F5\/F6 category<\/a>. Error code numbering can vary slightly between the F4, A4, and E4 (overlock) manuals, so always cross-check against your machine's specific model.<\/p>\n\n<h2>Common Jack Machine Issues and What Usually Needs Replacing<\/h2>\n<ul>\n<li><strong>Uneven stitching or fabric not feeding smoothly<\/strong> \u2014 usually a worn feed dog (\"dati\") or presser foot. These are low-cost, frequently replaced parts.<\/li>\n<li><strong>Thread breaking or loose stitches<\/strong> \u2014 check the thread tension assembly and needle plate for burrs first; a bent or wrong-type needle is another common cause.<\/li>\n<li><strong>Machine not starting or running erratically<\/strong> \u2014 on computerized F4\/F5\/F6-type models, check the error code on the display first (see above); it often points to the motherboard PCB or speed control pedal rather than the motor itself.<\/li>\n<li><strong>Bobbin winding unevenly<\/strong> \u2014 the bobbin winder assembly or its rubber wheel.<\/li>\n<li><strong>LED work light flickering or not working<\/strong> \u2014 a straightforward replacement on models with a built-in light, and worth checking before assuming a bigger electrical fault.<\/li>\n<\/ul>\n\n<h2>Is Jack a Good Sewing Machine Brand? Jack vs Juki<\/h2>\n<p>Jack (established 1995, China) and Juki (established 1938, Japan) are two of the most common industrial sewing machine brands found in Indian garment units. Juki has a longer manufacturing history and is often seen as the more established name for heavy, continuous-duty production; Jack has built its reputation more recently around energy-efficient direct-drive motors and computerized features like the F4\/F5\/F6 series at a generally more accessible price point. In practice, both brands are widely used side by side in Indian factories and tailoring shops, and the right choice usually comes down to your specific machine type, budget, and what your local mechanics are most familiar servicing. Either way, keeping genuine or well-matched compatible spare parts on hand matters more for uptime than the brand name alone.<\/p>\n\n<h2>How Much Do Jack Spare Parts Cost?<\/h2>\n<p>Pricing varies a lot by part type. Small wear parts like feed dogs and presser feet are typically in the \u20b935\u2013\u20b9150 range, needle plates and tension sets are usually mid-range, and electronic components like motherboard PCBs and control boxes cost significantly more since they're precision electronics rather than simple mechanical parts. Browse the specific model category above for exact current pricing on the part you need.<\/p>\n\n<h2>Original vs Compatible Parts<\/h2>\n<p>For everyday wear parts \u2014 presser feet, feed dogs, needle plates, bobbin winders \u2014 a well-made compatible part performs the same as original and is the more economical choice for routine maintenance. For electronic components like motherboard PCBs, sensors, and speed control pedals, matching the exact connector type and part number reduces the chance of a fitting issue, since these can vary between production revisions of the same model.<\/p>\n\n<h2>Who Buys Jack Spare Parts From Us<\/h2>\n<p>Tailors and alteration professionals, boutique owners, garment manufacturing units, sewing machine mechanics and technicians, dealers, and training institutes running Jack machines across India \u2014 whether it's a single replacement part or ongoing stock for a repair business.<\/p>\n\n<h2>Ordering Jack Spare Parts from StitchPartner<\/h2>\n<p>We deliver Jack sewing machine spare parts across India with <strong>Cash on Delivery available on eligible orders<\/strong>. If you're unsure which series or part your machine needs, send us a photo of the machine's data plate or the worn part, and our team can help confirm compatibility before you order.<\/p>\n\n<h2>Frequently Asked Questions<\/h2>\n<h3>How do I know which Jack model I have?<\/h3>\n<p>Check the data plate on your machine, usually near the handwheel or on the machine arm \u2014 it shows the exact model number. Several Jack models look visually similar, so relying on the printed model number is more reliable than appearance alone.<\/p>\n<h3>What does error E2 mean on a Jack sewing machine?<\/h3>\n<p>E2 indicates the motor controller is behaving abnormally. Check the motor controller's wiring and connections first; if the error persists after a restart, the motor controller itself may need inspection or replacement.<\/p>\n<h3>What does error E1 mean on a Jack F4?<\/h3>\n<p>E1 means the motor plug has come loose or disconnected. Turn the machine off, firmly reseat the motor connector, and restart the machine \u2014 this resolves the error in most cases.<\/p>\n<h3>Is Jack a good brand for industrial sewing machines?<\/h3>\n<p>Jack is one of the most widely used industrial sewing machine brands in Indian garment units, known particularly for energy-efficient direct-drive and computerized models. It's generally viewed as a solid, accessible option alongside brands like Juki, Brother, and Siruba \u2014 reliability in practice depends more on proper maintenance and genuine or well-matched spare parts than the brand alone.<\/p>\n<h3>How does Jack compare to Juki?<\/h3>\n<p>Juki has a longer manufacturing history (founded 1938 vs Jack's 1995) and is often preferred for heavy continuous-duty production, while Jack is known for energy-efficient motors and computerized features at a generally more accessible price point. Both are widely used in Indian factories, and the better choice depends on your specific use case and budget.<\/p>\n<h3>How much does a Jack feed dog (dati) cost?<\/h3>\n<p>Feed dogs for Jack single-needle lockstitch machines are typically in the \u20b935\u2013\u20b980 range on our site, depending on the exact model and tooth configuration. Check the category matching your machine model for current pricing.<\/p>\n<h3>Why does my Jack machine skip stitches or break thread?<\/h3>\n<p>The most common causes are a worn feed dog, a burred or damaged needle plate, an incorrect or bent needle, or incorrect thread tension. Check these in order before assuming a more serious mechanical fault.<\/p>\n<h3>Are parts interchangeable between different Jack models?<\/h3>\n<p>Some mechanical parts are shared across similar machine types, but electronic components like motherboard PCBs and control boards are typically model-specific. Always check the category that matches your exact model before ordering electronic parts.<\/p>\n<h3>Do you offer Cash on Delivery on Jack spare parts?<\/h3>\n<p>Yes, COD is available on eligible orders and locations across India, along with prepaid card and UPI payment at checkout.<\/p>\n<h3>Can I order Jack spare parts in bulk for a factory or repair shop?<\/h3>\n<p>Yes, we regularly supply garment factories, tailoring units, and repair shops with multiple spare parts per order. Contact our support team for help with larger or recurring orders.<\/p>\n<h3>What if I can't identify which part is causing the problem?<\/h3>\n<p>Describe the issue \u2014 skipped stitches, thread breaking, an error code on the display, and so on \u2014 or send a photo of the machine and the suspected part, and our team can help point you to the right component before you order.<\/p>\n","parent":0,"count":101,"filter":"raw","image":""},{"term_id":793,"name":"JK-781\/JK-T781D","slug":"jk-781-jk-t781d-spare-parts","term_group":0,"term_taxonomy_id":793,"taxonomy":"product_cat","description":"<h1 data-start=\"189\" data-end=\"248\">Reliable JK-781\/JK-T781D spare parts for Smooth Operation<\/h1>\r\n<p data-start=\"250\" data-end=\"386\">Looking to bring your sewing machine back to life? These trusted components are designed to keep your work flowing without interruption.<\/p>\r\n\r\n<h2 data-start=\"388\" data-end=\"423\">Perfect Fit for Seamless Repairs<\/h2>\r\n<p data-start=\"425\" data-end=\"631\">Every item in this collection is tailored to fit the JK-781 and T781D models. From feed dogs to tension units, the parts are made to match factory specs, helping users replace worn elements with confidence.<\/p>\r\n\r\n<h2 data-start=\"633\" data-end=\"671\">Crafted for Daily Use and Long Life<\/h2>\r\n<p data-start=\"673\" data-end=\"877\">Professionals and hobbyists alike have relied on these spares to fix performance issues. With strong materials and easy installation, <strong data-start=\"807\" data-end=\"838\">JK-781\/JK-T781D spare parts<\/strong> make maintenance simple and effective.<\/p>\r\n\r\n<h2 data-start=\"879\" data-end=\"920\">Why Stitchers Trust These Replacements<\/h2>\r\n<ul data-start=\"922\" data-end=\"1097\">\r\n \t<li data-start=\"922\" data-end=\"960\">\r\n<p data-start=\"924\" data-end=\"960\">Durable and tested for regular use<\/p>\r\n<\/li>\r\n \t<li data-start=\"961\" data-end=\"998\">\r\n<p data-start=\"963\" data-end=\"998\">Quick setup with no special tools<\/p>\r\n<\/li>\r\n \t<li data-start=\"999\" data-end=\"1043\">\r\n<p data-start=\"1001\" data-end=\"1043\">Helps restore original stitching quality<\/p>\r\n<\/li>\r\n \t<li data-start=\"1044\" data-end=\"1097\">\r\n<p data-start=\"1046\" data-end=\"1097\">Ideal for tailors, workshops, and service centers<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"1099\" data-end=\"1189\">Whether you're fixing, upgrading, or maintaining\u2014choose parts that work as hard as you do.<\/p>","parent":765,"count":54,"filter":"raw","image":""},{"term_id":1103,"name":"Sewing Machine Motherboard &amp; PCB Control Boards","slug":"sewing-machine-motherboard-and-chip","term_group":0,"term_taxonomy_id":1103,"taxonomy":"product_cat","description":"<p><strong>Sewing machine motherboard and PCB control boards for industrial machines:<\/strong> main boards for Jack, Qi Xing, Zoje, Messer and Magneto machines cost \u20b91,500 to \u20b94,650 in our live catalogue, with display panels and pedal boards from \u20b9300. Match the part number printed on your old board, then order with COD across India.<\/p>\n<h2>Sewing Machine Motherboard Price List (Live Catalogue)<\/h2>\n<p>A sewing machine motherboard, also called a PCB, control board or circuit board, runs motor speed, needle position, auto-trimming and pedal response. Price depends on the machine model, not the brand name alone. Here is the current price range by board type.<\/p>\n<table><thead><tr><th>Board type<\/th><th>What it does<\/th><th>Price range<\/th><\/tr><\/thead><tbody><tr><td>Main motherboard \/ PCB control board<\/td><td>Controls motor, needle stop, trimmer and sensors<\/td><td>\u20b91,500 \u2013 \u20b94,650<\/td><\/tr><tr><td>Universal direct drive servo control board<\/td><td>Replaces a dead servo control board on direct drive motors<\/td><td>\u20b92,500<\/td><\/tr><tr><td>Overlock control board<\/td><td>Speed and function control for overlock heads<\/td><td>\u20b93,200 (Qi Xing); \u20b9649 (GT-900D speed controller)<\/td><\/tr><tr><td>Display panel \/ LED speed panel<\/td><td>Shows speed and settings, takes your button input<\/td><td>\u20b9300 \u2013 \u20b9499<\/td><\/tr><tr><td>Pedal board and foot controller<\/td><td>Sends speed signal from the foot pedal<\/td><td>\u20b9450 \u2013 \u20b91,300<\/td><\/tr><tr><td>Connectors and voltage regulator<\/td><td>Wire connectors and small support boards<\/td><td>\u20b920 \u2013 \u20b9299<\/td><\/tr><\/tbody><\/table>\n<h2>Which Motherboard Fits Which Machine<\/h2>\n<p>Do not choose a board by how the machine looks. Choose it by the part number on your old PCB. Here are the boards we stock for common industrial machines.<\/p>\n<table><thead><tr><th>Machine \/ board<\/th><th>Part number or model<\/th><th>Price<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/jack-a2b-pcb-19510031200\/\">Jack A2B main control board<\/a><\/td><td>19510031200<\/td><td>\u20b92,900<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/jack-a2-cz-9950014900-pcb\/\">Jack A2-CZ motherboard PCB<\/a><\/td><td>9950014900<\/td><td>\u20b93,499<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/jack-a2c-a2-cz-pcb-control-board\/\">Jack A2C \/ A2-CZ control board<\/a><\/td><td>A2C A2-CZ<\/td><td>\u20b92,900<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/jack-9100b-904a-pcb-control-board-9950017800\/\">Jack 9100B 904A control board<\/a><\/td><td>9950017800<\/td><td>\u20b93,099<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/jack-9950009500-pcb-control-board-9100bs-9100bp\/\">Jack JK-9100BS \/ 9100BP control board<\/a><\/td><td>9950009500<\/td><td>\u20b92,999<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/jack-781g-main-pcb-control-board-19950020300\/\">Jack 781G main control board<\/a><\/td><td>19950020300<\/td><td>\u20b94,650<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/qd8633-qi-xing-sewing-machine-control-board\/\">Qi Xing control board<\/a><\/td><td>QD8633<\/td><td>\u20b93,100<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/qd8626-qi-xing-control-board\/\">Qi Xing control board<\/a><\/td><td>QD8626<\/td><td>\u20b93,200<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/8623-qi-xing-control-board-zoje-sewing-machine\/\">Qi Xing control board for Zoje machines<\/a><\/td><td>QD8623<\/td><td>\u20b93,200<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/qixing-mother-board-model-c\/\">Tova TTM Messer servo motor motherboard<\/a><\/td><td>TTM<\/td><td>\u20b91,799<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/c3-sewing-machine-circuit-board\/\">C3 motherboard<\/a><\/td><td>C3<\/td><td>\u20b92,500<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/magneto-motherboard-for-single-needle-sewing-machine\/\">Magneto motherboard, single needle<\/a><\/td><td>Magneto<\/td><td>\u20b92,500<\/td><\/tr><tr><td><a href=\"https:\/\/stitchpartner.com\/product\/esda-servo-motor-pcb-control-board-sewing-machine\/\">ESDA servo motor PCB control board<\/a><\/td><td>ESDA<\/td><td>\u20b91,500<\/td><\/tr><\/tbody><\/table>\n<h2>How to Choose the Right PCB for Your Machine<\/h2>\n<h3>1. Read the part number on the old board<\/h3>\n<p>Unplug the machine, open the control box and read the number printed on the green board. Order that exact number. For Jack machines you can also check our <a href=\"https:\/\/stitchpartner.com\/jack-sewing-machine-part-numbers\/\">Jack sewing machine part numbers lookup<\/a>.<\/p>\n<h3>2. Check the generation of the board<\/h3>\n<p>Some machines have an old type and a new type of the same board, for example on the Jack F4 line. Their connectors and firmware can differ, so match the type, not just the model name.<\/p>\n<h3>3. Compare connectors and voltage<\/h3>\n<p>Count the connector sockets and compare their layout with the old board. A board can physically fit and still lose trimmer, foot lifter or display functions if pins are missing.<\/p>\n<h3>4. Send us a photo before you order<\/h3>\n<p>If you are not sure, send a photo of the old PCB and the machine model. We check the match first, so you do not pay for a board that will not work.<\/p>\n<h2>Motherboard, PCB, Control Board and Control Box: What Is the Difference?<\/h2>\n<p>Buyers use these words for the same part, but a control box is the casing that holds the PCB, the power supply and the connectors. A motherboard replacement is only the board inside. If your control box is damaged or burnt, ask us whether you need the board alone or the full box such as the <a href=\"https:\/\/stitchpartner.com\/product\/direct-drive-servo-motor-control-board\/\">direct drive servo control board<\/a>.<\/p>\n<h2>Signs Your Sewing Machine PCB Has Failed<\/h2>\n<p>A failing board usually shows erratic motor speed, no reaction to the foot pedal, a frozen or blank display, or no power despite a good socket. Before you buy, rule out a loose pedal wire or a faulty motor. Our guides on <a href=\"https:\/\/stitchpartner.com\/sewing-machine-servo-motor-problems-error-codes-troubleshooting\/\">servo motor problems and error codes<\/a> and <a href=\"https:\/\/stitchpartner.com\/jack-sewing-machine-error-codes-all-models\/\">Jack error codes for all models<\/a> help you tell a board fault from a motor fault.<\/p>\n<h2>Sewing Machine Motherboard FAQ<\/h2>\n<h3>What is the price of a sewing machine motherboard in India?<\/h3>\n<p>Main PCB control boards in our catalogue cost between \u20b91,500 and \u20b94,650, depending on the machine. Jack A2B is \u20b92,900, Jack 781G is \u20b94,650 and Qi Xing QD8633 is \u20b93,100. Display panels and pedal boards cost less, from \u20b9300. Prices on this page are live catalogue prices and COD is available.<\/p>\n<h3>How do I know which PCB fits my sewing machine?<\/h3>\n<p>Match the part number printed on your old board, not the machine's looks. Then compare the connector layout and the voltage rating, and check whether your board is an old or new type. Our stock list above shows the part number for each board, so you can compare it before ordering.<\/p>\n<h3>Can I use a universal or generic PCB instead of the original?<\/h3>\n<p>A universal board works only where its connector layout and functions match your machine, for example the direct drive servo control board for servo motors. For machines with auto trim and sensors, a model-specific board is safer, because a generic board may not drive every function.<\/p>\n<h3>How do I know if the PCB is faulty and not the motor?<\/h3>\n<p>If the motor runs only at full speed, stops at random, or ignores the pedal while the pedal and wires are good, the board is the usual cause. If the machine has no power at all, check the plug, fuse and power cable first. When in doubt, send us the symptoms and the machine model.<\/p>\n<h3>Are Jack A2B and Jack A2C PCBs the same?<\/h3>\n<p>No, treat them as different boards. Jack A2B uses part number 19510031200, while the A2-CZ board uses 9950014900. Both are in stock here, so compare the number on your old board before you order. Do not swap them just because both belong to the A2 range.<\/p>\n<h3>Do you deliver sewing machine motherboards across India with COD?<\/h3>\n<p>Yes, we ship pan-India and COD is available on these boards. Check the product page for the live price and stock status before you place the order, since stock changes through the day.<\/p>","parent":0,"count":36,"filter":"raw","image":""}],"product_tag":[{"term_id":3125,"name":"19950020300 PCB","slug":"19950020300-pcb","term_group":0,"term_taxonomy_id":3125,"taxonomy":"product_tag","description":"","parent":0,"count":1,"filter":"raw","image":""},{"term_id":3126,"name":"buttonhole machine PCB","slug":"buttonhole-machine-pcb","term_group":0,"term_taxonomy_id":3126,"taxonomy":"product_tag","description":"","parent":0,"count":1,"filter":"raw","image":""},{"term_id":3131,"name":"buttonhole machine spare parts","slug":"buttonhole-machine-spare-parts","term_group":0,"term_taxonomy_id":3131,"taxonomy":"product_tag","description":"","parent":0,"count":2,"filter":"raw","image":""},{"term_id":3127,"name":"buttonhole sewing machine parts","slug":"buttonhole-sewing-machine-parts","term_group":0,"term_taxonomy_id":3127,"taxonomy":"product_tag","description":"","parent":0,"count":3,"filter":"raw","image":""},{"term_id":3128,"name":"industrial sewing machine PCB","slug":"industrial-sewing-machine-pcb","term_group":0,"term_taxonomy_id":3128,"taxonomy":"product_tag","description":"","parent":0,"count":11,"filter":"raw","image":""},{"term_id":3124,"name":"Jack 781 PCB","slug":"jack-781-pcb","term_group":0,"term_taxonomy_id":3124,"taxonomy":"product_tag","description":"","parent":0,"count":1,"filter":"raw","image":""},{"term_id":3123,"name":"Jack 781G PCB","slug":"jack-781g-pcb","term_group":0,"term_taxonomy_id":3123,"taxonomy":"product_tag","description":"","parent":0,"count":1,"filter":"raw","image":""},{"term_id":3129,"name":"main circuit board","slug":"main-circuit-board","term_group":0,"term_taxonomy_id":3129,"taxonomy":"product_tag","description":"","parent":0,"count":1,"filter":"raw","image":""},{"term_id":3130,"name":"sewing machine control board","slug":"sewing-machine-control-board","term_group":0,"term_taxonomy_id":3130,"taxonomy":"product_tag","description":"","parent":0,"count":11,"filter":"raw","image":""},{"term_id":3132,"name":"sewing machine electronic parts","slug":"sewing-machine-electronic-parts","term_group":0,"term_taxonomy_id":3132,"taxonomy":"product_tag","description":"","parent":0,"count":6,"filter":"raw","image":""}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - 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