
As I've had to half strip the machine I might as well do the thermocouples whilst the thing is in pieces, though I now have the problem of a rather low coffee supply and no roaster

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simonp wrote:Hmm, how ironic is this? I just went to roast some beans and the Hottop is totally dead.... Something had failed on the main board and no supply is getting to the control board! Not impressed that the new boards have failed after about 10 roasts. Unfortunately the extra board for the computer control need the original control board to be still working so now I am a bit stuffed. To add even more irony, the second pair of upgrade boards (sent in error) have just gone back to Taiwan....
simonp wrote:It seems the PCB mounted fuse prior to the bridge rectifier has gone, so no supply to the low voltage stuff. I can't see anything wrong with the supply after that so perhaps we just had a voltage surge though fuses usually go for a reason. My internet router did throw a wobbler at a similar time to plugging in the Hottop so could be a mains issue. I'll just have to get another one and see, you have to buy them from Farnell in packs of 10 of course![]()
As I've had to half strip the machine I might as well do the thermocouples whilst the thing is in pieces, though I now have the problem of a rather low coffee supply and no roaster
simonp wrote:...The silicone is rated to 220 so add you say will need an eye keeping on. I plan for it to only just come through so hopefully it will be OK.
GreenBean wrote:Oh what a pain, it must be very frustrating.I am sure that Shelly at Hottop will sort it out for you if you contact her. I assume from what you say that the roaster is completely dead with no sign of life from any LED's on the power board.
The power board supplies a 5 volt supply to the rear fan, bean cooling fan and the bean stirrer motor as well as the control panel. I have only heard of one other user having similar problems and in his case the bean cooling fan had failed and shorted out which caused failure of the 5 V power supply (I think the voltage regulator failed). I suggest you test the fans and stirrer motor to ensure they have not failed/shorted and/or disconnect them before trying the repaired board.
GreenBean wrote:You are probably correct Simon. I should have said low voltage rather than 5 volt. I have never had a problem with any of these components so have not looked into this. It is unfortunate that Hottop have not released any circuit diagrams or specs for the relevant components.
simonp wrote:Spacers before and after applying the JB Weld.
I have trial fitted the thermocouples and the silicone tubing works well and holds them in steady...
simonp wrote:...Also today my boards have come for the computer control, and the fuse to replace the failed one. Hopefully it was just the fuse...
GreenBean wrote:simonp wrote:...Also today my boards have come for the computer control, and the fuse to replace the failed one. Hopefully it was just the fuse...
I will keep my fingers crossed, you deserve some good luck now.
simonp wrote:....Soldered in the new fuse and tested the board on the bench and it all seems to work fine
GreenBean wrote:simonp wrote:....Soldered in the new fuse and tested the board on the bench and it all seems to work fine
Great news.Now for the fun bit, getting it all back together and experimenting with computer controlled roasting.
Or is the fun bit roasting and drinking good coffee again?
CakeBoy wrote:You stay here, we woudn't want you to suffer! Perhaps one of us could bear the burden of Italy in your stead? Meanwhile you can stay at home and enjoy decent coffeeOh, go on!
simonp wrote:CakeBoy wrote:You stay here, we woudn't want you to suffer! Perhaps one of us could bear the burden of Italy in your stead? Meanwhile you can stay at home and enjoy decent coffeeOh, go on!
It is OK, I will grin and bear it
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