5th May 2010, 1:48 pm | #241 |
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Re: Pye v4
C101 to chassis measures 84.4 I wouldn't bother trying to measure the current as we can track the fault down using resistance. C101 or C18 are the most likely culprits.
Last edited by PJL; 5th May 2010 at 1:56 pm. |
5th May 2010, 1:49 pm | #242 |
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Re: Pye v4
Ok, Is the set on at the moment? if so check the voltage on both sides of the 47 ohm resistor also on tag 2 from the right hand side its R 17
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5th May 2010, 1:52 pm | #243 |
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Re: Pye v4
If C18 was missing would that give us the issue? I was chatting with Lloyd yesterday and I said I cannot find it at all anywhere.
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5th May 2010, 1:52 pm | #244 |
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Re: Pye v4
Not really relavent its from an already smoothed HT supply, OTT has said there is 208v on both sides of R131 so its not drawing any current.
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5th May 2010, 1:52 pm | #245 |
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Re: Pye v4
in a word no.
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5th May 2010, 1:55 pm | #246 |
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Re: Pye v4
13mV on the tag side, on the other side of it 23mV, this must be due to the break in the bottom leg as R131 would then feed the V to that part
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5th May 2010, 1:59 pm | #247 |
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Re: Pye v4
You must have an o/c that 47 ohm is connected to R131 and you have already said that it has 208 v on it the two middle tags are linked on the tag strip remember and C18 is there I can see it on your piccy
Ill send you a pic of mine to explain
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5th May 2010, 2:00 pm | #248 |
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Re: Pye v4
which one? not the yellow, I thought that was C23, I replaced
R131 is disconnected at the bottom leg when i did the voltage test on R17 by the way, which is why they would have nothing. Last edited by oldticktock; 5th May 2010 at 2:05 pm. |
5th May 2010, 2:06 pm | #249 |
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Re: Pye v4
Thats C18 not 23, I thought you said everything was connected up. Reconnect everything and lets have another go!
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5th May 2010, 2:09 pm | #250 |
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Re: Pye v4
If I connect it the burning starts very quickly, R131 gets VERY hot and smoke starts pluming from it and I was worried so disconnected it, Sorry I did not make that clear.
If you think its ok to do so I will, I have to nip out to do the school run so will be a while Chris |
5th May 2010, 2:10 pm | #251 |
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Re: Pye v4
Stop...we disconnected R131 for this reason.
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5th May 2010, 2:12 pm | #252 |
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Re: Pye v4
OK. Dont stop. With the set OFF put your meter on ohms and read the resistance between chassis and the end of R131 that goes to the tag strip. What do you get?
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5th May 2010, 2:14 pm | #253 |
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Re: Pye v4
Murphy310 I had forgotten and edited my post! We had already decided to remove R131 from the circuit as it was overheating. It is drawing no current because it is disconnected. There is a fault leaving an 84.4 ohm resistance to chassis.
The plan was to leave the RF till last. I expect C101 is faulty and will need to be removed from circuit. |
5th May 2010, 2:18 pm | #254 |
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Re: Pye v4
Thanks PJL.
I am sure that this problem can be sorted in a few minutes, I have my V4 on the bench and both the trader manual & manufacturers but need to go out in 20mins or so hence the haste!
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5th May 2010, 2:18 pm | #255 |
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Re: Pye v4
started at 12K and is walking down now at 9.5K
I need to stop now as I have to do the school run, hopefully we can pick up later now 8.9k now back to 9.04K seems to be stable-ish around at 9.04k |
5th May 2010, 2:22 pm | #256 |
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Re: Pye v4
Hi.
I thought you had a resistance reading of 84 ohms which PJL has said, was this at the same point you took the reading if not where did you take the reading from?
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5th May 2010, 2:23 pm | #257 |
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Re: Pye v4
84.4 OHMS reading was from c101 to chassis the 12uf
the top of R131 is fed from c102 200uf |
5th May 2010, 2:24 pm | #258 |
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Re: Pye v4
OK but this is the same point I asked you to read, has something changed or have you misread my post?
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5th May 2010, 2:27 pm | #259 |
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Re: Pye v4
Yeah It's cause I'm rushing and misread your post, humble apologies, chassis to tag 84.6R.
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5th May 2010, 2:28 pm | #260 |
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Re: Pye v4
Good Man.
One simple check left!! snip off the positive connection to C101 and recheck the 84 ohms you had.
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