Re: Help with a clock radio
I want to put in in anyway. I would have replied sooner but there was a half-day power outage. A power spike from a previous outage is what actually took the end-of-life capacitor over the edge and short causing this problem.
The power quality hasn't been good lately as all the power transmission infrastructure hardware is past end of life.
The clock has a non-polarized plug, and each side has an inductor - but of different values. 2uH on one (open), and it looks like the other working one is rated 10uH...
lopaka1998
Member
Last Activity: 11-01-2016, 11:44 PM
Joined: 05-05-2014
Location: torrance
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Re: Help with a clock radio
Weird... it was working [I]yesterday[/I]! Seriously
Here's attempt 2. I've reattached to this post.
The picture reasonably represents the 3rd color. Stj - it's sort of in the middle. I would guess gold but look at the picture and let me know what you think.
I've got two other opinions, one person thinks brown, one thinks gold. I guess this is the question of the day, for me at least.Re: Help with a clock radio
Weird... it was working [I]yesterday[/I]! Seriously...Leave a comment:
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Re: Help with a clock radio
Arg.. .Just when I thought I was done, I've found another problem - an open inductor. Picture attached. It goes from the mains to the input of the transformer. It's got a red dot, a black dot, and a big brownish gold colored mark on it's right side. It's marked as L9 on the board.
When I patched a different transformer in there temporarily, I bypassed the inductor because I used the power cord already connected to the new transformer - thus I didn't spot this earlier. Anyone know how to read these old part values, and what a suitable replacement...Leave a comment:
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Re: Help with a clock radio
thanks stj.
I've got one last question. There are 4 ceramic capacitors for bypass at the transformer outputs that connect just before the diodes, so it's still technically ac. I want to replace them too as i'm not sure if any of those parts got overloaded (they do measure within spec though).
So my question: I've heard X7R shouldn't be used for pulses... Would a Z5U work in this case instead? I'm trying to find replacements for them but find myself confused after reading up on it.
3 of the...Leave a comment:
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Re: Help with a clock radio
I'm still looking for replacement diodes. The new transformer is 9v, 750mA, but I don't think the clock radio will use more than about half of that.
I was thinking of using a 1N4002 diode but I've never replaced a diode before so I'm not quite sure if the specs are ok.
Would 1N4002 diodes work for this application?
I think I saw one of those the other day on one of the youtube videos I was watching of a vintage radio repair. It had a hole in the center for adjustments that was...Leave a comment:
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Re: Help with a clock radio
Here are some pics. Maybe this is an exception. I'm seeing end of '81 era date markings on the caps and the original transformer. I'm sure it's a power transformer with multiple out taps. But I am still learning so correct me if I'm wrong. the transformer has been removed at this point, and is on it's side.
[url]https://www.badcaps.net/forum/attachment.php?attachmentid=126445&stc=1&d=1454028404[/url]
[url]https://www.badcaps.net/forum/attachment.php?attachmentid=126446&stc=1&d=1454028404[/url]...Leave a comment:
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Help with a clock radio
I have an old ge clock radio from the early 80s. A filter capacitor shorted and killed the transformer with it.
The clock still works - I've used a temporary 9v transformer to test it (after removing the shorted cap) and everything works.
There are several filter caps with Rarcan brand, and one caps with rubycon brand with the following markings:
Rubycon
16v 470uF
CE W
8145
S.C.
85C M
There are ceramic disc caps for bypassing high frequencies in the areas that need it.
Is the rubycon... -
Re: Tdk 614-003
Yes, it's bad. It's leaking from the bottom. You can't see it in the pic. I'm not surprised. It's 20 - 22 years old, only rated 85c/1000 hours and had well over 1000 hours of use - I wouldn't be surprised if it was many times that, easily. I didn't think Nichicon's bulge often - unless of course a bad batch is made or a catastrophic failure of other components have occurred.
Can anyone here answer my above question - Why is the 385 volt LQ and the 8.2uf PF cap not specified in the datasheet?
The reason I ask is that...Leave a comment:
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Re: Tdk 614-003
Thanks. That helped.
One last question - the Nichicon LQ capacitor is 385 volt but there is no 385 volt in the datasheet. Also the Nichicon PF cap is 8.2uf, but the datasheet only shows 6.4 and 10uf. Why? You can see what I mean by looking at their current equivalent datasheets - LS series and PJ series. It's nearly the same.
As for the person who couldn't see the picture - I can see it. It's hosted on bayimg.com. Maybe that domain is blocked in your area? I'll try to find a better image hosting provider for next time....Last edited by lopaka1998; 07-14-2014, 02:55 PM.Leave a comment:
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Tdk 614-003
I've got an old TDK power supply out of an old Macintosh LC III.
On the low voltage side there are 4 Nichicon PL series caps. There are also 4 other Elna RSG series caps with a 9240 date code. I can easily replace the Nichicon PL with Nichicon PM series. I can't seem to find a specsheet on the elna caps. Are they reasonably equivalent to Nichicon PL (and therefore replaceable with the PM series)?
Are there better caps I could put in there other than Nichicon PM?
Also on the high voltage side are two electrolytic caps. I've been able to find their datasheet...Last edited by lopaka1998; 07-11-2014, 08:10 PM. -
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