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Dahao A68 Series Embroidery Machine Maintenance Guide
Quick answer: Regular maintenance for your Dahao A68 series embroidery machine involves daily cleaning and lubrication, weekly checks of critical components like needles and hooks, and periodic inspection and replacement of wear parts such as needles, rotary hooks, trimmer blades, and specific circuit boards to ensure optimal performance and longevity.
Maintaining your Dahao A68 series embroidery machine is key to its longevity and consistent stitch quality. Regular cleaning, lubrication, and timely replacement of wear parts will prevent costly breakdowns and ensure your machine operates at peak performance. This guide provides a comprehensive maintenance schedule and identifies common wear items to help you keep your A68 running smoothly.
Two-minute checks before you open anything
- Check for any loose threads or fabric scraps around the needle plate and rotary hook area.
- Inspect needles for damage (bends, burrs, dullness).
- Ensure bobbin is correctly inserted and bobbin case tension is appropriate.
- Verify that all thread paths are clear and free of tangles.
- Check that the presser foot is at the correct height for your material.
- Listen for any unusual noises during a test stitch.
1. Needles high likelihood
How to tell
Frequent thread breaks, skipped stitches, damaged fabric, dull needle points visible under magnification, or bent/burred needles.
Fix
- Inspect needles for straightness, sharpness, and burrs before each shift or if stitch quality declines.
- Replace needles immediately if any damage is found. Ensure the correct needle type and size are used for the fabric and thread.
- Always insert needles with the scarf facing the rotary hook.
Parts involved: Needles & needle bars →
2. Rotary Hook Assembly high likelihood
How to tell
Excessive noise from the hook area, shredding of bobbin thread, poor bobbin thread tension, skipped stitches, or visible burrs/scratches on the hook point or race.
Fix
- Remove the bobbin case and inspect the rotary hook for lint buildup, nicks, or burrs on the hook point and inside the race.
- Clean the hook area thoroughly with compressed air and a small brush.
- If burrs are present, gently polish with very fine emery cloth or replace the entire rotary hook assembly if damage is significant.
- Ensure the hook timing is correct after any significant work in this area (refer to your machine manual).
Parts involved: Rotary hooks & bobbin cases →
Parts you may need for Dahao
In stock, tested before dispatch, Buyer Protection on every order. Part types for this problem: Rotary hooks & bobbin cases, Needles & needle bars, Thread path & tension, Cutters & trimmers.
DAHAO EF176 EF117 EF1219 Alarm Plate & Bottom Line Detection Board ...$ 19.49View part →
Dahao D-30AGDYZ Switch Power Supply for Computerized Embroidery Mac...$ 50.49View part →
D-30AGD Switching Power Supply 5V-4A / 12V-1A for China Dahao Embro...$ 28.49View part →
Dahao EF164D Frame Limit Sensor with Cable (2 Pcs) for Feiya, ZGM, ...$ 34.99View part →
Dahao EF120 Alarm Circuit Board for Chinese Embroidery Machines$ 42.49View part →
DAHAO MD02 Frame Driver Board for MD202 MD201 Chinese Embroidery Ma...$ 220.49View part →All Dahao parts → Rotary Hooks & Bobbin Cases → Needles & Needle Bars → Thread Path & Tension →
3. Thread Trimmer Blades (Fixed and Moving) medium likelihood
How to tell
Inconsistent thread trims, threads not cutting cleanly, frayed thread ends after trimming, or frequent thread jams during trimming operations.
Fix
- Inspect both the fixed and moving trimmer blades for nicks, dullness, or excessive lint buildup.
- Clean any lint or debris from around the blades.
- If blades appear dull or damaged, replace both the fixed and moving blades as a set for optimal performance.
- Ensure proper blade alignment and tension (consult your machine manual for specific adjustments).
Parts involved: Cutters & trimmers →
4. Tension Discs and Springs medium likelihood
How to tell
Inconsistent upper thread tension, looping on the top or bottom of the fabric, thread shredding at the tension discs, or visible grooves worn into the discs.
Fix
- Remove tension discs and clean any lint or debris accumulated between them.
- Inspect discs for wear, grooves, or rough spots. Replace if damaged.
- Check tension springs for proper compression and ensure they are not bent or broken. Replace weak or damaged springs.
- Reassemble and test thread tension, adjusting as necessary.
Parts involved: Thread path & tension →
5. Belts (X/Y Axis, Main Shaft) medium likelihood
How to tell
Squealing noises during operation, visible cracks or fraying on the belt surface, loss of step in X/Y movement, or inconsistent stitch registration.
Fix
- Visually inspect all drive belts for signs of wear, cracking, fraying, or excessive slack.
- Check belt tension; belts should be taut but not overly tight. Adjust tension according to your machine's manual.
- Replace any belt showing significant wear or damage. Ensure correct belt type and length are used.
Parts involved: Belts, pulleys & gears →
6. Dahao MD202G XY Pantograph Driver Board low likelihood
How to tell
Erratic or no movement of the pantograph in X or Y directions, machine freezing during movement, or specific error codes related to motor drivers. This is a critical component for machine movement.
Fix
- Power off the machine and disconnect from power.
- Visually inspect the board for any signs of burnt components or physical damage.
- Check all cable connections to the board for looseness or corrosion.
- If other troubleshooting (motor checks, cable checks) fails and symptoms point to driver failure, replace the DAHAO MD202G XY Pantograph Driver Board.
- Ensure proper grounding and connection upon installation.
Requires careful handling and static discharge precautions.
Parts involved: Circuit boards & electronics → Motors & drivers →
7. Dahao EF139 12-Needle Decoder Board / DAHAO EF104 Decoder Board low likelihood
How to tell
Incorrect needle selection, machine failing to switch needles, specific needles not engaging, or error codes related to needle selection. These boards manage the needle change mechanism.
Fix
- Power off the machine and disconnect from power.
- Inspect the board for any visible damage or loose connections.
- Check the ribbon cables connecting the decoder board to the main control system and needle selection mechanism.
- If needle selection issues persist after checking mechanical components and cables, replace the appropriate decoder board (Dahao EF139 or DAHAO EF104 depending on your specific configuration).
- Ensure correct orientation and secure connections.
Requires careful handling and static discharge precautions.
Parts involved: Circuit boards & electronics →
8. Dahao 328-7V LCD Display Panel / Dahao IF101 LCD Display Inverter Card low likelihood
How to tell
Display screen is blank, flickering, showing distorted images, or only partially lit. If the screen is completely dark but the machine sounds operational, it could be the inverter card. If the screen shows garbled text or lines, it's more likely the panel itself.
Fix
- Power off the machine and disconnect from power.
- Check all cable connections to the display panel and inverter card for looseness.
- If the display is dark, try replacing the Dahao IF101 LCD Display Inverter Card first.
- If the display is garbled or physically damaged, replace the Dahao 328-7V LCD Display Panel.
- Handle with care to avoid static discharge and damage to delicate connectors.
Requires careful handling and static discharge precautions.
Parts involved: Control panels & displays → Circuit boards & electronics →
9. DAHAO EF122F Twelve Pin Alarm Card Circuit Board low likelihood
How to tell
Machine frequently triggers false alarms (e.g., thread break, bobbin empty) without actual issues, or fails to register legitimate alarms. This board processes alarm signals.
Fix
- Power off the machine and disconnect from power.
- Inspect the board and its connections for any visible damage or corrosion.
- Verify that sensors connected to this board (e.g., thread break sensors) are clean and functioning correctly.
- If sensor issues are ruled out and false/missing alarms persist, replace the DAHAO EF122F Twelve Pin Alarm Card Circuit Board.
- Ensure all pins are correctly seated during installation.
Requires careful handling and static discharge precautions.
Parts involved: Circuit boards & electronics → Sensors & switches →
Maintenance schedule
| When | What to do | Why |
|---|---|---|
| Daily (or every 8 hours of operation) | Clean the rotary hook area and needle plate. | Removes lint and debris that can cause thread breaks, skipped stitches, and damage to the hook. |
| Daily (or every 8 hours of operation) | Lubricate the rotary hook. | Reduces friction and wear, ensuring smooth operation and preventing heat buildup. |
| Daily (or every 8 hours of operation) | Wipe down the machine exterior and control panel. | Prevents dust and lint accumulation from entering critical components. |
| Weekly (or every 40 hours of operation) | Clean thread tension assemblies. | Removes lint and wax buildup that can cause inconsistent thread tension and thread breaks. |
| Weekly (or every 40 hours of operation) | Inspect and clean thread path components (thread guides, take-up lever). | Ensures smooth thread flow and prevents snagging or fraying. |
| Weekly (or every 40 hours of operation) | Lubricate needle bars and presser foot bar. | Ensures smooth vertical movement and reduces wear. |
| Monthly (or every 160 hours of operation) | Inspect and clean trimmer blades. | Ensures clean thread cuts and prevents jams; identifies dull blades for replacement. |
| Monthly (or every 160 hours of operation) | Check and clean pantograph rails and lubricate if specified by manual. | Ensures smooth X/Y movement and prevents binding or inaccurate stitching. |
| Monthly (or every 160 hours of operation) | Inspect drive belts for wear and tension. | Identifies potential issues before they lead to slippage, noise, or component failure. |
| Quarterly (or every 500 hours of operation) | Thoroughly clean under the needle plate and around the feed dog area. | Removes stubborn lint and debris that can affect fabric movement and stitch quality. |
| Quarterly (or every 500 hours of operation) | Inspect all screws for tightness, especially in the needle bar and head assembly. | Prevents parts from loosening due to vibration, which can cause timing issues or damage. |
| Annually (or every 2000 hours of operation) | Professional inspection and service (recommended). | Ensures comprehensive check of timing, electronics, and internal components for optimal performance and longevity. |
Stop and call a technician if
- If you encounter persistent error codes that you cannot resolve with basic troubleshooting.
- If the machine exhibits severe mechanical issues like grinding noises, major timing problems, or significant pantograph movement errors.
- If you suspect a major electronic component failure (e.g., main control board) and are not comfortable with advanced diagnostics or replacement.
- For any issue that requires specialized tools or knowledge beyond your comfort level.
Prevent it coming back
- Use high-quality needles and replace them regularly, especially when changing fabric types or if any damage is visible.
- Use good quality thread that is appropriate for your machine and project to minimize lint and thread breaks.
- Keep your workspace clean and free of dust and debris, which can get into machine components.
- Do not force the machine if it jams; investigate the cause calmly to prevent further damage.
- Always power off and unplug the machine before performing any cleaning or maintenance inside the machine's covers.
- Follow manufacturer's recommendations for oil types and lubrication points, referring to your machine's manual.
Frequently asked questions
How often should I lubricate my Dahao A68 embroidery machine?
Daily lubrication of the rotary hook and needle bar area is crucial. Other moving parts, like the main shaft and pantograph rails, typically require lubrication weekly or monthly, but always consult your machine's specific maintenance manual for exact points and intervals.
What causes frequent thread breaks on my Dahao A68?
Frequent thread breaks can be caused by several factors including dull or bent needles, incorrect thread tension, burrs on the rotary hook or thread path components, poor quality thread, or incorrect machine timing. Start by checking your needle and cleaning the thread path and hook area.
Why is my Dahao A68 machine making unusual noises?
Unusual noises often indicate a need for lubrication, loose components, or wear in moving parts. Check for loose screws, worn bearings, or issues with the rotary hook. Immediately investigate any new or loud noises to prevent further damage.
Can I replace circuit boards on my Dahao A68 myself?
While some experienced technicians can replace circuit boards, it requires careful handling to prevent static damage, correct identification of the board, and proper re-connection of all cables. If you are not comfortable with electronics, it's best to consult a qualified technician or refer to detailed service manuals. Always disconnect power before attempting any board replacement.
How do I clean the tension assemblies on my Dahao A68?
To clean tension assemblies, lift the presser foot to release tension, then use a thin piece of fabric or dental floss to clean between the tension discs. For a deeper clean, you may need to carefully disassemble the tension unit, clean each disc and spring, and then reassemble, ensuring correct order and tension.
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