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Post by tflash9 on Nov 10, 2020 19:45:05 GMT
Hello. I was wondering if someone could help identifying the diodes (?) in the pictures. They are for the selection mechanism of my Rockola 444. As you can see they are cracked and need replaced but how do I know which diodes to order for replacement? I have a service manual but can't find anywhere in the manual that lists the specs of those diodes. Does anyone have any ideas? imageshack.com/i/pnsNnlaTjimageshack.com/i/pnvGy3vkjRegards, Tony |
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Post by Ron Rich on Nov 10, 2020 20:27:06 GMT
Hi Tony,
Are there any other ID marks, other then the date code on them ? What type of circuit is this-- What does the parts list say ?
Ron Rich
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Post by tflash9 on Nov 10, 2020 20:42:41 GMT
Ron, thanks for the reply. There are no other markings and the Service Manual that I have does not have a parts list. Actually it does have a parts list but it is only for the amplifier so that's no help. Probably need to find a parts catalog, eh?
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Post by Ron Rich on Nov 10, 2020 20:50:17 GMT
No--- you will probably need to purchase a Service Manual PACKAGE from one of the legit sources, listed in our FAQ's section. Or you can try a 1N4007 diode--probably will work ? Ron Rich
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Post by tflash9 on Nov 10, 2020 21:31:09 GMT
So was able to find a digital scan of a parts catalog. Those are listed as "44875 Plastic Silicon Rectifier", but no specs. Does that change your suggestion at all?
By the way, I'm very amateurish at this so I apologize for any stupid questions.
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Post by Ron Rich on Nov 10, 2020 22:23:25 GMT
Ain't no such thing as "stupid questions" ! I would try them--- Do you have the schematic of this section-- what/why are the diodes doing ?
Ron Rich
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Post by tflash9 on Nov 11, 2020 13:43:29 GMT
Ron, if I'm reading the schematic correctly they're part of the selection system. I've take a pic of the part of the schematic that I believe shows these diodes/rectifiers. imageshack.com/i/poo2jtUVj |
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Post by Ron Rich on Nov 11, 2020 13:50:24 GMT
Would be my GUESS that 007's should be more then adequate--Ron Rich
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Post by tflash9 on Nov 11, 2020 16:31:59 GMT
Sweet. I'll give them a try and let you know how it goes.
-Tony
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Post by tflash9 on Nov 13, 2020 15:24:46 GMT
So I replaced the bad ones with the 007s, powered on the box and they smoked...
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Post by Ron Rich on Nov 13, 2020 15:32:17 GMT
OK-- didja bother to determine what caused the original's to smoke first, before replacing them ? Gottabe a reason, which needs afixin' on ! Ron Rich
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Post by tflash9 on Nov 13, 2020 17:18:48 GMT
This thing has been sitting for 2 years and I couldn't quite remember what happened. All I could recall was that those diodes/rectifiers needed replace. Once I saw the smoke, I remembered.
I'm currently in the process of looking at the schematics and trying to figure out what could be causing this upstream.
Edit: Feel free to jump in with any suggestions lol
Edit 2: Lock Bar Selenoid is not getting energized when there are credits.
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