Sosijdog
New Member
- Messages
- 12
- Location
- Shetland Islands
Hi guys, first post on here and I hope you can help.
I have been given a Clarke 250T turbo to repair but it has me stumped. It operates perfectly at settings 1-4 but any higher the motor appears to stall and the PCB 5A fuse blows like a dead short?
The owner replaced the motor after the wire feed drive failed. However it still did not operate and he sent it to me. I found the pcb fuse blown and replaced it. Still nothing. I re-flowed the solder joints on the motor connections and it started working. I was then left with the issue explained above, it blows the fuse above setting 4...
I decided to re-flow ALL the connections on the PCB which cured the fault!?? But I didn’t actually do anything so was not convinced it was fixed. However, it worked perfectly on any setting.
After about 4 weeks the fault returned as expected...
I initially suspected a faulty SCR in the motor drive circuit and thought that perhaps the extra voltage may cause them to breakdown at higher settings. I replaced all 3. Tested all diodes and Replaced rectifier Diodes on the motor drive circuit.
Found a few minor issues and corrected them all... but still exactly the same?
I am now totally at a loss as to what the issue is.
Any advice on where to look next would be greatly appreciated.
I also will post up a video of the fault in action.
Thanks in advance guys.
I have been given a Clarke 250T turbo to repair but it has me stumped. It operates perfectly at settings 1-4 but any higher the motor appears to stall and the PCB 5A fuse blows like a dead short?
The owner replaced the motor after the wire feed drive failed. However it still did not operate and he sent it to me. I found the pcb fuse blown and replaced it. Still nothing. I re-flowed the solder joints on the motor connections and it started working. I was then left with the issue explained above, it blows the fuse above setting 4...
I decided to re-flow ALL the connections on the PCB which cured the fault!?? But I didn’t actually do anything so was not convinced it was fixed. However, it worked perfectly on any setting.
After about 4 weeks the fault returned as expected...
I initially suspected a faulty SCR in the motor drive circuit and thought that perhaps the extra voltage may cause them to breakdown at higher settings. I replaced all 3. Tested all diodes and Replaced rectifier Diodes on the motor drive circuit.
Found a few minor issues and corrected them all... but still exactly the same?
I am now totally at a loss as to what the issue is.
Any advice on where to look next would be greatly appreciated.
I also will post up a video of the fault in action.
Thanks in advance guys.