The regulator accepts an "unstable" and "variable" voltage and outputs a constant voltage. In this case it's -15 (79L15).
Keep hitting refresh on the page 🙂
Solder braid is used to make removing parts easy. It's a copper braided wire soaked on flux. You apply the hot iron to braid and joint to unsolder and the braid "wicks" the solder up instantly.
Solder braid is used to make removing parts easy. It's a copper braided wire soaked on flux. You apply the hot iron to braid and joint to unsolder and the braid "wicks" the solder up instantly.
If there's any chance of a phone call here that would be awesome. Especially if you are in the Uk as "White diode" scares me a bit! Lol!
Lets see how you go on first 🙂 We have major successes on here 😉
It's the diode next to the regulator that looks the same as those you replaced.
It's the diode next to the regulator that looks the same as those you replaced.
Solder braid, 2mm is best for "large" components like these.
Desoldering Braid : Desoldering Tools : Maplin
Desoldering Braid : Desoldering Tools : Maplin
And to confirm, C is the bottom left terminal rather than the one above it yes? If so. Nope still at 0.7v
C is pin 4 on the IC... the corner one. So there is a problem... possibly just the 79L15 that has been zapped by the failing diode. Other possibilities are that an IC has been damaged but that's the least likely tbh.
I'm going to have to call it night but I'm putting some notes down for you to follow... it's the easisest way as it enables you to keep referring back and then it will start to make sense.
I'm going to have to call it night but I'm putting some notes down for you to follow... it's the easisest way as it enables you to keep referring back and then it will start to make sense.
O.k. Ill buy a 79L15 and a 78L15 tomorrow at Maplins.
And some solder braid? Anything else for soldering?
And some solder braid? Anything else for soldering?
Before you can work on this you are going to need the solder braid and be confident using it (easy 🙂)
Nothing else for soldering.
I'll post the notes shortly, then it should make sense. Can you post the type number on the IC's. I see two are 4580'S can't make the others out. It's just in case there is a faulty one.
The secret of fault finding is to narrow the problem down by measurement and test... cutting the diode was a worthwhile guess... but it wasnt that... so now we do it properly 🙂
The snipped diode can be replaced with one of the 1N4002's
I'll post shortly...
I'll post the notes shortly, then it should make sense. Can you post the type number on the IC's. I see two are 4580'S can't make the others out. It's just in case there is a faulty one.
The secret of fault finding is to narrow the problem down by measurement and test... cutting the diode was a worthwhile guess... but it wasnt that... so now we do it properly 🙂
The snipped diode can be replaced with one of the 1N4002's
I'll post shortly...
Ok great. But can you tell me what things are by both technical term and location/description please? I'm trying to learn the jargon!
Ic's?
Suspect I know nothing. And you can't go wrong!! Quick learner though!
Ic's?
Suspect I know nothing. And you can't go wrong!! Quick learner though!
That's what I'm doing 🙂
Ultimately this is most likely the reg that is duff, and maybe the blue diode (zener) could have been taken out by all this, and finally one of the IC's.
Can you tell me the numbers on that diode ? in case we need a new one.
Ultimately this is most likely the reg that is duff, and maybe the blue diode (zener) could have been taken out by all this, and finally one of the IC's.
Can you tell me the numbers on that diode ? in case we need a new one.
Actually that zener appears to be on the positive rail when I trace the print back so it's OK I think.
Ok. Please. Ic?
The blue diode has BAT written on it. But I can't read the other value. Damn. I've never needed glasses!!!
The blue diode has BAT written on it. But I can't read the other value. Damn. I've never needed glasses!!!
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