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The M61 has an elevating seat. There is a speed limit switch which consists of 2 magnets that make contact under the seat on the seat post. If the 2 magnets are together then the chair thinks the seat is all the way down. If the magnets aren't touching it activates a safety feature in the controls which cuts power to the chair by 50% hence drives real slow. Try lowering the elevating seat down through the joystick controls. If that doesn't fix it then either the magnet switches on the seat post came unplugged or broke.
It sounds like you are describing the seat elevator on the 1120/2000. Depending on the type of electronics ( Penny and Giles or Dynamic) and the type of toggle (through the joystick or a separate toggle switch), there a number of explanations.
The electronics are designed to inhibit or slow down the speed of the chair 1/4 or 1/2 based on the position of the elevator with regard to the magnetic reed switch sensor on the elevate post. If the elevator is slightly raised the magnetic switch opens or closes. This inhibit is designed to slow down the chair for safety when it is elevated.
You may have a bad inhibit harness, bad sensor, poorly adjusted sensor, etc. The sensor and wiring is easy to check and adjust. The way I diagnose this problem is to bypass the inhibit harness to test at full speed and work my way back to the faulty component.
You can do the magnetic reed switch adjustment yourself with a small screwdriver. Move the magnet and sensor on the elevate post until it works. This is a trial and error type of adjustment. The sensor and magnet should move close enough to activate the switch sensor without hitting.
The fact that the chair does not work at all in the down position probably means the harness is getting pinched or is bad, A continuity check is the best way to verify this.
By the way ,the easiest way to do all this checking is by pulling the seating system and removing the cover of the base. A common household magnet is handy to have for testing.
Hope this helps.
1) Yes your power seat functions can be programed into your drive 4,You'll need a programmer or have to take it into a shop.
2) yes the chair can be manually elevated down,You'll want to take it to a shop for that ,because it requires jumping the power to the seat elevator and swapping the wires around and I would never recommend my customers to do such a thing because of electric shock or burning up the chair.
If your chair has a four wat toggle switch("what controls your power seat functions elev,recl,telt,ext) If thats what your using right now there may be a red light that comes on in drive lock out ,If that light is not on follow that wire all the way down it may have been pinched or cut.If so it will need to be replaced.
Problems like this one is hard to trouble shoot over text or phone ,if your four way switch cord is cut or smashed .Your gunna have to take it into a shop just to make sure ,It didnt cause any electrical problems in your chair .
Good luck hope i had the chair in front of me so i could help you more.
For the Pride Jazzy wheel chairs you can locate what you need at the Jazzy website at the following link http://www.thescooterstore.com/products/product_manuals.aspx
When on the site you will locate the chair you need and the wire diagrams are in the owners manuals. As a common problem is just a plug comingun-wired they tell you where they are and the wire configuration. If you tell me some of the other chairs you are dealing with I will try and locate the website for them as well.