<h2>KaVo MASTERmatic M20 L Troubleshooting: Is It the Head or the Shank?</h2>

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With interchangeable heads, every KaVo MASTERmatic M20 L problem starts with the same question: which part is causing it?

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This guide uses that question to get you to an answer quickly.

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Safety first: stop using the M20 L if a bur is not held securely or the head runs hot.

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<h2 style="text-align:justify">The Head-Swap Test</h2>

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If you have a spare INTRA LUX head, fit it and repeat the test. If the problem disappears, the original head is the cause. If it stays, look at the shank, motor, and coupling.

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<h2 style="text-align:justify">Symptom Guide</h2>

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<table align="center" cellspacing="0" style="border-collapse:collapse; width:900px">
	<thead>
		<tr>
			<td style="background-color:black; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:1px solid black; vertical-align:top; width:158px">
			Symptom
			</td>
			<td style="background-color:black; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:1px solid black; vertical-align:top; width:192px">
			Head-Swap Result
			</td>
			<td style="background-color:black; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:1px solid black; vertical-align:top; width:225px">
			Likely Culprit
			</td>
			<td style="background-color:black; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:1px solid black; vertical-align:top; width:205px">
			Next Step
			</td>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:158px">
			Bur slips
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:192px">
			Fixed by new head
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:225px">
			Original head chuck
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:205px">
			Head service
			</td>
		</tr>
		<tr>
			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:158px">
			Roughness
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:192px">
			Fixed by new head
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:225px">
			Original head
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:205px">
			Head service
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			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:158px">
			Dim light
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:192px">
			Not fixed
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:225px">
			Shank light path or motor
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:205px">
			Test another LUX motor
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			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:158px">
			Weak spray
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:192px">
			Not fixed
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:225px">
			Filter or shank channels
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:205px">
			Change filter; clean
			</td>
		</tr>
		<tr>
			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:158px">
			Loose on motor
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:192px">
			Not fixed
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:225px">
			Coupling O-rings
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:205px">
			Replace O-ring set
			</td>
		</tr>
	</tbody>
</table>

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<h2 style="text-align:justify">Bur Will Not Stay Put</h2>

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Use a fresh, correct bur. If it still slips, the head&#39;s chuck needs attention. Stop using that head.

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<h2 style="text-align:justify">Light Fading</h2>

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KaVo lists a 25,000 lux glass rod conductor. Try another LUX motor; if it stays dim, the shank&#39;s light path needs service.

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<h2 style="text-align:justify">Dim light that will not brighten? Have Repair.Dental: check the shank.</h2>

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<h2 style="text-align:justify">Spray Weak</h2>

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Replace the exchangeable filter and clean nozzles with KaVo&#39;s dedicated needles, as KaVo&#39;s care tips advise. Avoid descaling agents.

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<h2 style="text-align:justify">Roughness</h2>

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Lubricate with KaVo Spray or the QUATTROcare PLUS and test again with the head swap.

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<h2 style="text-align:justify">When to Stop</h2>

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<ul>
	<li>
	A bur that keeps slipping
	</li>
	<li>
	Heat at the head
	</li>
	<li>
	Roughness on every head you try
	</li>
</ul>

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<h2 style="text-align:justify">M20 L Troubleshooting FAQs</h2>

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How do I know if it is the head or the shank?

Swap in a spare INTRA LUX head. If the problem goes away, it is the head.

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Why is my M20 L light dim?

Test on another LUX motor. If still dim, the shank&#39;s light path needs service.

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<h2 style="text-align:justify">Related Readings from RepairGuru :</h2>

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<ul>
	<li style="text-align: justify;"><a href="https://repair.dental/repairguru/handpieces/repairing-star-500-elite-electric-handpieces-a-complete-guide">Repairing Star 500 Elite Electric Handpieces: A Complete Guide</a></li>
	<li style="text-align: justify;"><a href="https://repair.dental/repairguru/handpieces/preventive-maintenance-tips-for-stardental-handpieces">Preventive Maintenance Tips for StarDental Handpieces</a></li>
	<li style="text-align: justify;"><a href="https://repair.dental/repairguru/handpieces/choosing-the-right-service-for-stardental-handpiece-repairs">Choosing the Right Service for StarDental Handpiece Repairs</a></li>
	<li style="text-align: justify;"><a href="https://repair.dental/repairguru/handpieces/stardental-handpiece-repair-costs-turnaround-times">StarDental Handpiece Repair Costs &amp; Turnaround Times</a></li>
</ul>

 
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<a href="https://repair.dental/print-shipping-label/handpiece-repair">Start Your Repair</a>

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KaVo M20 L bur slipping, rough, dim or spraying weakly? Find out whether the fault is in the head or the shank with these checks.

KaVo MASTERmatic M20 L Troubleshooting | Repair.Dental