10th Apr 2010, 2:53 pm | #201 |
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Re: Tv62
pin1 4.3
pin2 2.6 pin3 2.5 pin4 4.3 pin5 4.4 pin6 167.4 pin7 12.7 pin8 172.7 pin9 108 |
10th Apr 2010, 2:56 pm | #202 |
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Re: Tv62
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10th Apr 2010, 3:00 pm | #203 |
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Re: Tv62
I'm no expert, but I suggest rechecking R19 and disconnecting C14.
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10th Apr 2010, 3:06 pm | #204 | |
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Re: Tv62
Quote:
Dave Last edited by Boom; 10th Apr 2010 at 3:14 pm. |
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10th Apr 2010, 3:13 pm | #205 |
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Re: Tv62
One end of c14 read 0.1v the other end that meets R19 is 4.7v
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10th Apr 2010, 3:15 pm | #206 |
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Re: Tv62
Chris fly to R37 (100k)! It's either that or C14 itself.
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10th Apr 2010, 3:16 pm | #207 |
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Re: Tv62
Disconnect one end of C14 and measure the voltage on pin 1 again. If Ok replace C14. If not check the voltage on both ends of R19.
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10th Apr 2010, 3:28 pm | #208 |
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Re: Tv62
R37 measures 105k, i've just clipped one end of C14 out that junctions with R19&R37 readings coming
pin 1 voltage 14.6 |
10th Apr 2010, 3:44 pm | #209 |
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Re: Tv62
We have been round this loop before, last time you measured (post 177) it was 400V on the hot end of R19!
Try swapping the PCL83 with the other one. |
10th Apr 2010, 3:51 pm | #210 |
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Re: Tv62
PCL was brand new fitted yesterday.
With C14 clipped out R19 measure 4.6v one end and 14.0 the other |
10th Apr 2010, 3:54 pm | #211 |
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Re: Tv62
Either the HT for the PCL83 has disappeared or it's being pulled down by something. As the PCL83 was changed yesterday it's a likely candidate despite being brand new. Try changing it.
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10th Apr 2010, 3:55 pm | #212 |
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Re: Tv62
Do I leave C14 clipped out?
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10th Apr 2010, 3:57 pm | #213 |
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Re: Tv62
How can you have 400V at R19 in post 177 and 4.7V now? I can't see that a faulty PCL83 would drag the line down that much anyway.
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10th Apr 2010, 3:58 pm | #214 | |
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Re: Tv62
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10th Apr 2010, 4:01 pm | #215 |
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Re: Tv62
Is the meter on AC or DC volts? All measurements need to be DC.
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10th Apr 2010, 4:12 pm | #216 |
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Re: Tv62
This is where i start to despair
On my digital bench meter set to read DC i get 325v on one end and 7.6v the other end of R19. With my AVO model 7, which I hate! I get 215v and 4.5v Oh and new pcl83 in in place now I take it that C14 is a standard cap not Electrolytic, if that is being the case and its duff then I do not have a 2uf replacement. Last edited by oldticktock; 10th Apr 2010 at 4:19 pm. |
10th Apr 2010, 4:21 pm | #217 |
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Re: Tv62
C14 is marked on the circuit as an electrolytic. If the voltage readings are indeed correct then it isn't likely to be C14 but do you have one to make sure? Those measurements are probably correct. The Avo will drag the line down. It sounds like the oscillator has stalled.
Why are you getting all these different readings though Chris? Do you have dodgy meter leads maybe? Dave |
10th Apr 2010, 4:44 pm | #218 |
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Re: Tv62
Yep checked the schematic and its electrolytic. I think trouble i've been at this, allowing for lastnight sleep 16hours and i'm not thinking straight.
Just had a sanity break and a cuppa, I have 2uf electrolytics so I will clip one in. Lleads are from an avo multiminor plugged into a digi bench meter, been reading fine until today. The AVO7 has the original heavy duty leads. I won't blame my tools guess it's just me being a plank somewhere along the line. Chris |
10th Apr 2010, 4:51 pm | #219 |
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Re: Tv62
If C14 is very leaky then reconnecting it will bring the voltage down again. If it isn't the voltage will stay high.
If it's leaky and the earthed end is lifted, conecting a voltmeter between the lifted lead and earth will give a high voltage reading. If the reading is zero then the cap isn't leaking.
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10th Apr 2010, 4:57 pm | #220 |
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Re: Tv62
I have clipped in a new 2uf and have the meter clipped on the + end watching it rise over the last 5 mins started at 199v now its at 275v and climbing
At 293V now and still climbing Think it may have topped out at 296V 0v on neg end of C14 296v on + end of C14 296v one side of R19 6.9v on other side of R19 6.9v on pin1 of PCL83 296v on R37/R19 junction 343v on R37 other end Last edited by oldticktock; 10th Apr 2010 at 5:13 pm. |