Hilti TE 905-avr reset service light - help!

[Twincam.22]

Guys, I have a hilti kango hammer drill and the service light has been on and it is now not working anymore.

From what I've read this is down to the amount of hours it has been operating for and now requires a factory service and reset to work again.
I can replace the brushes myself but I can't reset the service light.
The only way to not send this back to hilti seems to bypass the sealed circuit board but I'd prefer not to play with the wiring.

Is there any manual reset I can do ?.
Thanks..

 

[KnurledNut]

Is it blinking or solid?

This is gonna sound crazy, but try taking a red laser pointer and shine it right into the light, sweeping it back and forth.
See if it goes out.

 

[Twincam.22]

Its solid now was blinking. I have a laser pointer used for presentations and that so i'll try that thanks...It appears the light is actually an optical receiver aswell as a indicator.

 

[Twincam.22]

no luck shining a laser at it, i seen the clip on youtube for another model of hilti drill that this worked but i cant get it to reset.

After mlooking at this again i'm wondering if its possible to bypass the circuit board altogether and wire direct....??

Does the circuit board drop or adjust supply in, supply is coming from tranformer 110V..

 

[Twincam.22]

is this correct?

 

[Twincam.22]

I got this sorts lads by bypassing the circuit board working perfect again !!!

 

[KnurledNut]

Were the brushes pretty well used up?
Did you have any trouble sourcing new ones?

 

[Twincam.22]

No was lots left on them...I didn't bother replacing in the end, just wired direct to the motor and bypassed the circuit board she running as good as new now ! Brushes are available on eBay or Amazon for small money if ya need them though...

 

[Cali-V]

Hey Twin Cam... I'm in the same situation... thinking of the using the same solution, but have two questions regarding maintenance:

1. What Oil did you use if any...
2. How did you remove the side cover to access the brushes? Mine is tight as hell.