The fix for this fault is to replace the chip in the VSI controller. This happens when you consistently drive the power chair with weak or low voltage batteries.
SOURCE: I HAVE A JET 3 ULTRA CHAIR, WE LOSS THE 24V PRIDE
You can use the AC charger cord from a computer as a replacement for the AC cord of the charger. If the AC cord plugs into the wall and plugs into the charger or charger receptacle on the back of the power chair, you can use it.
If I remember correctly, This chair has a 4 Amp on-board charger which has an AC receptacle on the back of the chair to plug in an AC cord. The off-board chargers take a universal AC cord which will work with a universal computer AC cord. If the AC cord plugs in, use it.
SOURCE: New batteries won't charge on Jet3 Pride Chair.
Lets make sure the all battery terminals have the correct cable ,heres a web sit that you can go on to double check.http://www.pridemobility.com/pdf/Owners_Manuals/US_Jazzy/US_Jet_3_Ultra_om.pdf
Page 40 shows a diagram that covers it all.
Next after confirming that everything is connected correct,plug the chair in like if you where going to charge it,
I want you to check your ammeter if the needle moves to the center of the gage your charging if not you may have a bad charger.
Good luck hope i was helpful
SOURCE: When I turn on controller
Do all of the speed lights flash at the same time or do they ripple from left to right? If they ripple from left to right the chair is in lock mode and you can use the unlock procedures from my tips to unlock. If they are all flashing at the same time you have an internal joystick problem and the joystick needs to be replaced Hope this helps
SOURCE: pride jazzy 600 power wheelchair controller lights flash
make sure the motors are not disengaged, turn off chair, can you move it by pushing it? if so lock the wheels and try again. next is the controller in lockout. press and hold the on button till it beeps push joystick forward til it beeps pull it back til it beeps turn off try again. you can call 1-800-800-8586 for tech support
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