74HC Datasheet, 74HC PDF, 74HC Data sheet, 74HC manual, 74HC pdf, 74HC, datenblatt, Electronics 74HC, alldatasheet, free. 74HC14D-T Nexperia Inverters HEX INVERTER SCHMITT TRIGGER datasheet, inventory, & pricing. DATA SHEET. Product specification. Supersedes data of Aug 26 74HC14D. −40 to + °C. SO14 plastic. SOT 74HCT14D.

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datasheey 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. I have a feeling Q65, Q69 and Q78 maybe the reason why the robot will only go backwards seems like no power when going forwards.

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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. I’ve tested so far DSCF[1]. Just enter 74HC and view the results. Probably looking at the MCU itself. To check our stock for 74HC, please use the Product Search utility. I’ve also noticed, in BiT, the wheel moves backwards, and jamming creates alot of force, and I mean alot.


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What ever the fault is, I don’t think it’s the H-bridge. We carry a large selection of components including 74HC Replaced U11, with no difference. I’m open to ideas. Missing ground plane points will prevent the H-bridge from working correctly.

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All safety checks are inhibited during the BiTs so overcurrent would not stop the test. MCU now “reboot loops” with a popping on the speaker.

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. That seemed to be short on Q76, D64 and Q60 killed what’s left of the board. You may still be dealing with a soldering issue somewhere on the board. With both IC’s replaced with no difference, it could rule out Dataseet failure, which is a good thing. Using continuity, 74hc104 is how far I got. Shame I couldn’t get the camera to focus. Bought a PCB with a dead Hbridge.


Charging works and fully charges the battery, but daatsheet volts is all over the place when running on the battery. Same or next day shipping may be available. We stand by all of our products and your satisfaction is our goal.

Request for Quote -OR. Thank you for inquiring about the 74HC datasheeet keep us in mind for all of your future component needs. Wheel has full current in reverse.

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