[robbyd]

Understood now – thanks

[robbyd]

Thanks –

 

I believe the problem now to be with either the power supply ‘brick’, though there isn’t much inside it, or the main pcb.

I don’t see why running it without the top platter could cause damage, especially if you don’t try to land the arm…

 

best regards

[robbyd]

Dillen – thank you – it was run briefly without the platter. My bad – too late; but useful information for the future!

 

Glitch – thank you –

there were no connections mis-placed. A wire may have been pinched to the motor (as the subbplatter was on the base board – I only saw this today- but not certain it broke the insulation).

I would really like to fix this myself… but appreciate it may be beyond my knowledge at the moment.

I have other 8002s I could swap parts with but don’t want to risk killing those too!

It has occurred to me that this may be an unfortunate coincidence where something failed, as I don’t believe anything shorted at the time…

have tried measuring the output pins on the supply brick, but cannot find a reference for earth. Which pins should give what voltage? Cannot find info on that… but it must be outputting something if the pcb is smoking!!

several caps do not measure their intended values, but can they cause the problem I have? I sense not…

 

again, thank you for the replies.

[robbyd]

Well after further investigation, the fuse is no longer blowing, but if I leave it connected to the mains for a couple of seconds, I get smoke from the area of pcb1 where the power block connects…

diodes?? Why?

anyone?

thanks

[robbyd]

Hi again –

this is unfortunately turning into a tale of woe!

Had the 8002 with its case in open/service position and was running the carriage up and down , observing the spindle shaft/sensor end, when it suddenly stopped dead…

main fuse in power supply box blown.

I thought something may have earthed out on the chassis by accident,(my fault) so swapped in a new IR sensor anyway. Got some slo-blo 160mA main fuses – but they keep blowing; sometimes instantly, other times within a second (you see it glow up and then blow).

disconnected the 4x connector blocks from main pcb, so motors, carriage etc not powered, but it still blows. If power supply not connected to main pcb, fuse doesn’t blow…

what would be your guess as to what might have happened?

I can’t see any visible damage to components on the board, or in the tin box, but obviously can’t look at any voltages there because the fuse blows every time..

thanks in advance,

Rob

[robbyd]

Thanks Martin – much appreciated…

 

you’re talking about the segmented end by the drive belt?

regards

Rob

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