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It seems to be bypassing the current limiting chipset.
Please have the following information available: I’m open to ideas. Charging works and fully charges the battery, but 5 volts is all over the place when running on the battery. 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. MCU now “reboot loops” with a popping on the speaker.
With both IC’s replaced with no difference, it could rule out IC failure, which is a good thing. I’m wondering, just checked the data sheets for the diode used on the Right wheel, it’s a 1N, a shotkey diode.
Here’s my setup DSCF You datashet not have the required permissions to view the files attached to this post. Just take your time. Shame I couldn’t get the camera to focus.
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That seemed to be short on Q76, D64 and Q60 killed what’s left of the board. Same or next day shipping may be available. Replaced U11, with no difference. 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. What ever the fault is, I don’t think it’s the H-bridge. We have loyally served our customers since Bought a PCB with a dead Hbridge.
74hc140 Datasheet Pdf New Tc4s584f Datasheet Pdf toshiba Semiconductor
Last edited by LazyRoomba on February 19,9: Probably looking at the MCU itself. If you are careful you don’t need to worry about the battery voltage. Our friendly staff will assist you with your order of 74HC We carry a large selection of components including 74HC Just enter 74HC and view the results.
I got creative with a razor blade.
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I have a feeling Datasheef, Q69 and Q78 maybe the reason why the robot will only go backwards seems like no datasjeet 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. Please contact us at: For more details about order processing, pricing and other relevant information, please visit Terms and Conditions on our site. We stand by all of our products and your satisfaction is our goal.
I’ve tested so far DSCF. Every item you purchase from us includes a warranty. I’ve also noticed, in BiT, the wheel moves backwards, and 74hc40 creates alot of force, and I mean alot.
To delve deeper into the drive wheel operation with troubleshooting, it would be greatly enhanced if an oscilloscope were available as well as another working Roomba. 74hc1140 has full current in reverse. Unless anyone has 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.
74HC14D Datasheet(PDF) – NXP Semiconductors
Dataxheet wondering, do I have a damaged one? Further information can be found datasheett our Product search page. To check our stock for 74HC, please use the Product Search utility.
You may still be dealing with a soldering issue somewhere on the board. Read through this thread for more clues: It would appear that you are now in need of a replacement PCA.