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Old 5th May 2010, 1:48 pm   #241
PJL
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Default Re: Pye v4

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Quote:
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chris what does your meter read for ohms from c101 to chassis?

Dave
84.4r
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.
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Old 5th May 2010, 1:49 pm   #242
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Default 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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Old 5th May 2010, 1:52 pm   #243
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Default 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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Old 5th May 2010, 1:52 pm   #244
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Default Re: Pye v4

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chris what does your meter read for ohms from c101 to chassis?

Dave
84.4r
The voltage to chassis is probably incorrect due to AC content upsetting the
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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Old 5th May 2010, 1:52 pm   #245
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Default Re: Pye v4

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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.
in a word no.
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Old 5th May 2010, 1:55 pm   #246
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Default 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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Old 5th May 2010, 1:59 pm   #247
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Default Re: Pye v4

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13mV on the tag side, on the other side of it 23mV
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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Old 5th May 2010, 2:00 pm   #248
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Default 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.

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Old 5th May 2010, 2:06 pm   #249
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Default Re: Pye v4

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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 by the way, which is why they would have nothing.
Thats C18 not 23, I thought you said everything was connected up. Reconnect everything and lets have another go!
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Old 5th May 2010, 2:09 pm   #250
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Default 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
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Old 5th May 2010, 2:10 pm   #251
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Stop...we disconnected R131 for this reason.
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Old 5th May 2010, 2:12 pm   #252
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Default 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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Old 5th May 2010, 2:14 pm   #253
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Default 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.
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Old 5th May 2010, 2:18 pm   #254
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Default 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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Old 5th May 2010, 2:18 pm   #255
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Default 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
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Old 5th May 2010, 2:22 pm   #256
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Default 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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Old 5th May 2010, 2:23 pm   #257
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Default Re: Pye v4

84.4 OHMS reading was from c101 to chassis the 12uf
the top of R131 is fed from c102 200uf
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Old 5th May 2010, 2:24 pm   #258
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Default 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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Old 5th May 2010, 2:27 pm   #259
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Default 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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Old 5th May 2010, 2:28 pm   #260
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Default 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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