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Carboncrazy

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About Carboncrazy

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    Market Drayton

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  1. Problem Solved. Phew! A big thank you to Brown Dwarf for pointing me in the right direction. Sure enough, on checking the continuity of the wiring from the controller to the DEC motor (with the motor unplugged) one wire was intermittently open circuit. A previous owner had done a repair on the DEC OUT Din Socket. It had been done very neatly with the soldered joints covered in heat shrink. Unfortunately when I stripped and rebuilt the DEC I must have disturbed this wire. It was broken but held together by the heat shrink. If you pushed it made contact. If you pulled it didn't. I re-solder
  2. Sorry I've not played with stepper motors before (more learning for me). Do you know of any way of measuring the signal being fed to each coil. I don't have access to an oscilloscope. From the symptoms (lack of torque, oscillation and starting when helped) as you say, it could be one coil not being driven.
  3. Thank you for responding. I will try to rig up a 15v supply. It has worked perfectly well in the past down as low as 10v. It usually looses it position and stops tracking if the battery voltage gets too low. At the moment it carries on tracking after I have moved the RA and DEC and the battery voltage is stable at 13.5v.
  4. Thank you for that. I didn't know that they had high and low speed coils. Yes it would appear that the low speed coil is not being driven. The motor only runs at high speed and has little starting torque, needs a little help to get going. I will try to establish which wires are to each coil and trace them through.
  5. Yes all connected as you have described. In the last hour I have solved one problem but got another. I examined the motherboard with a loupe magnifier and found surface link (or coil) L4 to have failed. This link is on the power input to the board. All other "L" components read zero ohms, so I assume them to be either Links or coils. I have replaced it with a piece of fine wire (to protect the PCB). Now I get no error message. The RA works fine but the DEC will not work at slow speed. It works at 9 but at 2, 3 or 5 the motor oscillates from side to side. Suspecting the motor I swapped the mot
  6. Thanks for the prompt reply and suggestion. The DIN cables are plugged in (I have also swapped them round) and I have checked the continuity of them from the back of the socket on the driver box all the way to the motors. I had not thought of checking for short circuit but have now disconnected the motors (as they effectively provide a short circuit) and checked each wire for short to another. Alas, there seems to be no problem there either but thank you for the helpful suggestion.
  7. It looks very similar to the DA and DEC clamping levers on my EQ5 see attached pictures. If it is the same then the countersunk screw which holds them on is an M4 with a 0.7 pitch and the tread length is 5mm. There are plenty of stainless ones on ebay if you search M4 posidrive countersunk. The shortest thread I could find is 8mm so you may need to grind/file some off the length. Hope this helps.
  8. Can anyone help? I'm pretty much a novice at this astronomy stuff but loving the steep learning curve. I started by using camera lenses modified to use an eyepiece but after much debate, deliberation and saving up, I have finally bought my first proper telescope. Unfortunately I now have a problem. Last year I bought a second hand Synscan EQ5 mount which has worked perfectly each time I have used it. I used it about a month ago for the first time with the new scope (last time we had a clear sky). Everything worked as it should. At 2 am I parked the scope, dismantled everything and put it
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