Troubleshooting Makita DHR242 SDS Drill Control Board Issues

Understanding the Makita DHR242 SDS Drill

The Makita DHR242 is a popular SDS rotary hammer drill used by many construction professionals and DIYers. It offers impressive drilling and chiseling power packed into a relatively compact size. However, like any power tool, the DHR242 can develop issues over time. One common problem owners report is the drill not running properly due to a broken connector on the control board.

DHR242 Key Features and Specifications

Before diving into troubleshooting, let's first understand what makes the Makita DHR242 tick. Some key features and specs include:

• 1.2 inch SDS-plus chuck accepts a wide range of bits
• Powerful 7.5 Amp motor delivers 0-950 RPM & 0-4,500 BPM
• Variable speed trigger with reverse function
• Compact 13.4 inch length and 7.3 pound weight
• Brushless motor technology increases efficiency and runtime
• Anti-vibration technology minimizes user fatigue

Common Problems with the DHR242

Despite its impressive specs, some problems can pop up with heavy long term use of the DHR242:

• Brushes wearing out
• Switch malfunction
• Broken connections on the control board
• Chuck not gripping bits properly
• Gear damage or excessive noise

Pay attention to any sluggishness when trying to start the drill or intermittent cut outs during operation. Let's focus specifically though on troubleshooting a broken control board connector.

Control Board Connector Issues

The drill's control board routes power throughout the tool to operate the motor, switch, and safety components. Like any electronic device, connectors on the board can vibrate loose over time or get damaged from impacts.

Symptoms will typically include:

• Failure of the drill to start
• Drill starting but quickly cutting out
• Reverse or variable speed modes not working

Before assuming the control board itself is damaged, inspect all the connectors first. Wiggle them gently to check for loose wires or broken solder joints. Pay special attention to connectors for the switch and motor.

Removing and Inspecting the Control Board

If wiggling connectors does not resolve the problem, you will likely need to remove the board for inspection. This requires partially disassembling the gearbox and motor housing. Here is a quick overview:

1. Unscrew motor housing clamshell and remove armature
2. Extract gearbox assembly from housing
3. Detach any protective covers from the circuit board
4. Unsolder or unplug all electrical connectors
5. Remove mounting screws to free the circuit board
6. Visually inspect for damage like cracks or burnt spots

Pay attention to any evidence of overheating, which can degrade internal components over time. A magnifying glass can help examine solder joints for cracks. If everything checks out, refasten connectors and retest.

Replacing the DHR242's Control Board

If visible damage is confirmed on the circuit board, replacement will be necessary. For the DHR242, an authorized dealer or repair shop should have access to genuine Makita replacements.

Installation involves reversing all the steps for removal. Take care to properly heat shrink any disconnected wire terminals and securely solder connectors. Preventing future vibration damage is key for longevity.

After reassembly, perform a thorough test on high and low speeds with regular and rotation directions. Listen for any unusual noises that may indicate remaining issues.

Tips for Preventing Control Board Damage

Since the control board is such a critical component, here are some usage and storage suggestions to help prevent connector issues arising in the first place:

• Allow sufficient rest time between heavy duty drilling to prevent overheating
• Periodically inspect and tighten chassis screws to reduce vibration
• Clean out accumulated dust using compressed air
• Store drill in case or bag to prevent impacts during transport
• Consider adding rubber padding inside carrying case
• Check brushes and replace at first signs of wear

Taking preventative measures will minimize wear on sensitive electronics. Immediately repairing any dropped tools also reduces change of issues developing down the line.

Finding DHR242 Parts and Service Information

As a final tip, knowing where to source parts, schematics, and service instructions greatly helps DIY maintenance and repair. Be sure to consult Makita's support resources like:

• Official parts breakdown schematics for exact hardware identification
• Service manuals with detailed wiring diagrams and assembly procedures
• Exploded views showing motor, gearbox, and housing disassembly process
• Where to purchase authorized replacement parts online
• Locator help for local power tool service shops

Arming yourself with the right knowledge goes hand-in-hand with keeping your Makita 242 functioning smoothly for years of drilling tasks.

FAQs

What are the most common problems with the DHR242 drill?

The most reported issues with the Makita DHR242 drill are worn out brushes, malfunctioning switch, broken control board connections, chuck not gripping, and gear or noise problems. Pay attention to sluggish starts or intermittent cut outs during drilling.

How can I prevent control board damage?

Allow the drill proper rest between heavy jobs, maintain screws, clean out dust, store in a protected bag, install padding inside case, check brushes often, and repair any drops immediately. This minimizes wear on sensitive electronics.

Where can I find parts and repair diagrams?

Makita provides official parts breakdown diagrams, service manuals, exploded assembly views, replacement part retailers, and local authorized service shop finders. These resources are invaluable for DIY maintenance and repair.

What are the symptoms of a control board problem?

Issues with the DHR242's control board include complete failure to start, starting then quickly cutting out, and reverse or variable speed modes not functioning. Inspect all connectors first before assuming internal board damage.