EQ35 pro dec problems - Is this a dead motor ?

[mgirdwood]

Hi Everyone

I had a problem last night during setup where the Dec was making an awful noise.  So decided to stop and look at it in the light of day.

I took off the dec cover this morning and lifted the motor away from the dec gear so its not connected to the worm drive gear,  and this is what i can hear, so not worm gear but rather sound like there is a motor problem  ?

Quick vid where the problem can be heard :

https://www.dropbox.com/s/q2qx3chnjox72s1/Motor.MOV?dl=0

 

Any ideas if this is fixable or is it a new Dec Motor required ?

Thanks Again

Mark
 

[Darren Hill]

Does sound like there is an electrical issue. Were you able to find out what the issue was?

[malc-c]

Simple way to rule out the motor is to swap the motors over and connect the RA motor to the DEC output.  If the RA motor sounds the same when connected to the DEC output then it would rule out the DEC motor being faulty.  This could be confirmed by connecting the DEC motor to the RA connection and seeing if the motor sounds normal.  If this proves to be the case then the problem could either be a lose wire in the DIN plug / socket or, if the wiring checks out OK,  the synscan controller, most probably one of the  L293 drivers has failed.  

If you have ruled out all the connection points and the leads prove to be Ok (the use of a DVM can help here, or simply swap the cables over to see if the fault follows) and the fault looks to be the Synscan box then if your synscan box is of the older version without a USB port then it's quite easy to remove and replace the L293 using a dremel to cut the legs from the package, and a soldering iron and some decent flux to remove the rest of each leg from the board.