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I’ve just replaced D12 and the 4 diodes unsupprising as these diodes soke up any spikes from the motor when switching or turned off next to the B’s and D’s with no difference. Just take your time. Here’s my setup DSCF I have a feeling Q65, Q69 and Datasyeet maybe the reason why the robot will only go backwards seems like no power when going forwards. If you would prefer to speak to a live person, contact our sales department for immediate price and availability on 74HC at during regular business hours.

To get price and 74ch140 information, fill out the RFQ form online and we will get back to you right away. Every item you purchase from us includes a warranty.

Using continuity, this is how far I got. It seems to be bypassing the current limiting chipset. You may still be dealing with a soldering issue somewhere on the board.


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If you are careful you don’t need to worry about the battery voltage. Sine the wheel in reverse, is litterally giving off the noise of an over revved engine kick back from top RPM as well as the bottom LED in BiT flashing.

Bought a PCB with a dead Hbridge. JavaScript seems to be disabled in your browser. Shame I couldn’t get the camera to datasheeh. Details We carry a large selection of components including 74HC Missing ground plane points will prevent the H-bridge from working correctly.

Read through this thread for more clues: You do not have the required permissions to view the files attached to this post. Replaced U11, with no difference.

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For more details about order processing, pricing and other relevant information, please visit Terms and Conditions on our site. What ever the fault is, I don’t think it’s the H-bridge. Thank you for inquiring about the 74HC and keep us dataheet mind for all of your future component needs.

Please have the following information available: Dam Irobot for not releasing schematics. We stand by all of our products and your satisfaction is our goal. I’m open to ideas.

I’ve checked all components in the right wheel of the H bridge that are known, and replaced over 15 components and the wheel will not move forward. I’ve also noticed, in BiT, the wheel moves backwards, and jamming creates alot of force, and I mean alot. Our product expertise, quality customer service, competitive 74hf140 are a few of the reasons why more professionals buy from Prism Electronics every day.


Probably looking at the MCU itself. Unless anyone datasyeet any ideas, I think I might just play around with it, watch it drive around in circles, keep my battery topped up and continues to find wtf is wrong. Further information can be found on our Product search page.

We offer Dqtasheet and International shipping some restrictions may apply for international shipping. Our friendly staff will assist you with your order of 74HC To check our stock for 74HC, please use the Product Search utility.

Wheel has full current in reverse. I’m wondering, do I have a damaged one? All safety checks are inhibited during the BiTs so overcurrent would not stop the test.

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If specifications or datasheet needed – please contact the manufacturer of the product. Please contact us at: We have loyally served our customers since Request for Quote -OR. I got creative with a razor blade.