Thanks for the input lads.
In the meantime he has decided to send it back to the manufacturer.
Probably wise as that 5VDC line was going absolutely everywhere....
habanerocat
Senior Member
Last Activity: 12-10-2024, 01:32 PM
Joined: 11-21-2014
Location: Limerick
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Atoll ST200 Amp Power Supply Problem
Hi, A friend's streamer wend down after a lightening storm. It's dead.
I'd like to get some pointers before I go at it as it's an expensive piece of kit.
I already posted this in the audio section but got no replies. So hopefully somebody with PSU knowledge can help me here.
I'm not familiar with the damage lightening can do so any pointers would be gratefully received.
I've had a look at this. Both the 5VDC and 3.3VDC are sitting on about 2VDC.
There's two 7805 regulators one has an output of 5VDC the other is very hot and has that 2VDC level on the... -
I've had a look at this. Both the 5VDC and 3.3VDC are sitting on about 2VDC.
There's two L7805 regulators one has an output of 5VDC the other is very hot and has that 2VDC level on the output.
I'd like to cut the output leg of the L7805 next to see if it's being pulled low, but I can't get in at it. So I'd have to strip out the unit and remove it from the PCB.
My question is to ye experienced people, could the L7805 be blown or is it most likely being pulled low?
And if so, by what, given that this unit suffered from a lightening strike?
Than...Leave a comment:
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Atoll ST200 Amp
Hi, A friend's streamer wend down after a lightening storm. It's dead. I haven't looked at it yet.
Obviously it's probably the PSU but I'd like to get some pointers before I go at it as it's an expensive piece of kit.
I'm not familiar with the damage lightening can do so any pointers would be gratefully received. Thanks...... -
Re: Pioneer Plasma PDP 503PE. No Life Suddenly
I stuck in an old wirewound power resistor I had handy.
Would the resistor I took out (don't have it here) have special switching characteristics also?...Leave a comment:
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Re: Pioneer Plasma PDP 503PE. No Life Suddenly
Thanks for your help on this. I found an open resistor.
Are you saying I should change both resistors and relays as a precaution?
TV is now working....Leave a comment:
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Re: Fluke 23 Fusible Resistor
Ok, I can see where you are coming from on this. I'm no expert for sure, but I was hoping that there might be some simple test to check the functionality of the other components. Would Fluke test these protection devices before shipping I wonder?
They look good visually so I'll just leave well enough alone. Thanks for all yer help....Leave a comment:
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Re: Fluke 23 Fusible Resistor
RJ1, RJ2 and E1, as in the attached input circuit....Leave a comment:
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Re: Fluke 23 Fusible Resistor
Mine is a Fluke 23 Series II see attached.
So as the other components are reading open circuit, is there anything I can do to check that they are working? Without over risking more failures of course....Leave a comment:
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Re: Fluke 23 Fusible Resistor
Thanks, I replied above before I refreshed the page.
So are Thermistors and Fusible Resistors the same thing?
That looks like Rt in the circuit but I think it's actually R1....Leave a comment:
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Re: Fluke 23 Fusible Resistor
Thanks, how do I test that spark gap?...Leave a comment:
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Re: Fluke 23 Fusible Resistor
Ok, there seems to be a lot of conflicting information out there in relation to the devices in the attached circuit and photos. People on here seem to be making the most sense thankfully, so thanks.
Replaceable fusible resistor is ordered as above and on the way.
The two red MOVs, RJ1 & RJ2 are reading open circuit in resistance mode.
The yellow thermistor (PTC) E1, is also reading open circuit, so I presume this is blown.
So if I'm correct above I just need to find a thermistor which is labelled...Last edited by habanerocat; 03-07-2020, 10:44 AM.Leave a comment:
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Re: Fluke 23 Fusible Resistor
I presume the PTC you are talking about is the Variable Resistor, R1?
Or the Thermister E1/DS1?...Last edited by habanerocat; 03-07-2020, 07:05 AM.Leave a comment:
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Re: Fluke 23 Fusible Resistor
Yea, came across that site in a search. Very informative....Leave a comment:
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Re: Fluke 23 Fusible Resistor
I can't remember how I blew it. Think it was a 400V motor failtfind many years ago. Let's hope the MOVs aren't blown as I haven't checked them.
Thanks for the link but getting parts from the US is very expensive....Last edited by habanerocat; 03-06-2020, 12:45 PM.Leave a comment:
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Re: Fluke 23 Fusible Resistor
Managed to get some 10% substitutes on ebay Germany.Leave a comment:
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Fluke 23 Fusible Resistor
Hi,
I have the above DMM with a blown 1K 2W Fusible Resistor on the input circuit.
Maintenance manual says to replace with the exact part for safety reasons.
But I can't find this part or get a substitute for my usual suppliers here in Ireland/UK.
Any ideas?
Thanks.............. -
Re: Carlsbro Colt 45K Audio Amp
Seemingly these Darlington transistors don't test very well in circuit, or out of circuit for that matter. So I took them out and built a simple ciruit up on a breadboard. Sure enough the one that was almost short above was blown.
Amp back working............Leave a comment:
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Carlsbro Colt 45K Audio Amp
Got one of these to repair and need some advice please.
Basically it's blowing the two input 2AT fuses after the transformer on power up.
I upped them to 3.15A but they also blew.
The transformer output is ok and the speaker reads 4 ohms in circuit.
As you can see the board is a bit burned at the power transistors (TIP137 & TIP 132). One of them is reading 1ohm across two of its pins. The three serial diodes look ok.
I haven't been able to find a circuit for this amp online. Anybody got one?
Obviously I suspect... -
Re: Toshiba 40L1333DG no power, blinking green/red power light fixed by flashing firm
Ok an update.
TV still wasn't 100% right, especially on a cold start. Also the terrestrial tuner wasn't available in the tuner menu. So I download the latest firmware and load procedure from the Toshiba website. Tuner was now available and worked fine, but TV still wouldn't turn on consistently. Just a flashing green light.
So I took the drastic step indicated in the third link in my post directly above. @steviewonder is a genius. Many thanks to him.Leave a comment:
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