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BG8000 fuse issues

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ALF
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ALF posted on Mon, May 1 2017 7:02 AM

greetings all,

a new arrival, a BG8000, which had a partial re-cap job done by the previous owner.

I noticed C24 was put in the wrong way as its positive should connect to the F1 ?!

anyhow, I corrected that, completed the re-cap job incl C27 - see pictures - and now F1 is constantly blowing

even with my DBT ?

I checked D16 to D19, all measured ok.

did I overlook something ? any ideas or suggestions are most appreciated :-))

cheers

ALF


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ALF
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ALF replied on Sun, Jul 16 2017 7:18 AM

The question is, is this optical device really faulty or is there still a different devil to uncover ?

ALF

Dillen
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Dillen replied on Sun, Jul 16 2017 7:24 AM

That's the right way. Stop guessing and measure!
Are pulses output from the two receivers when the threaded shaft rotates? 

Martin 

ALF
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same procedure as before,

signal taken from P2-Pin6

first pic is a bit out of focus, sorry- just carriage moving right across

second pic is with the slow moving carriage, play pressed after carriage has been stopped with >>


ALF
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second pic from P2-Pin6, showing a very similar signal as the one from P2-Pin4

ALF


Dillen
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Dillen replied on Sun, Jul 16 2017 9:54 PM

Difficult to tell, but if that is 100mV amplitude, the sender IR is not emitting light.
(Those small signals could be caused by ambient light reflecting onto the opto wings on the threaded shaft ). 

Check the power to the IR sender LED.
If power is OK, check its light output with a digital camera.
IR light typically shows as pale blue on a digital camera.
(On some iPhones only the self-facing camera will work for this). 

Martin

ALF
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ALF replied on Mon, Jul 17 2017 7:04 AM

Thanks Martin,

I assume you are talking about the single optical device in the fixture of three, not the two next to eachother (wings you called them)?!

Its voltage is 4.98V, the other two next to eachother are getting about 14V

I could not see any pale blue traces on my digi camera,  providing I checked the correct element ?!

yes, the signal amplitude was  about 100mV.........! It looks like I will have to replace that single opto element - can you supply that ?

ALF

Dillen
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Dillen replied on Mon, Jul 17 2017 7:15 AM

Yes, the bottom element is the IR sender LED.
The wings I refered to are the four interruptors at the end of the threaded shaft. (It was a guess based on the signal and the fact that they rotate).

Martin

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