Hello From Sunny Ontario Canada today!
I’ve been given a W544 to look at as it has replaced the -28vdc output with 66vac which (I’m sure) means that diodes SR1 and SR2 are shorted. Never having dealt with this previously, My question is what is a good replacement for these metal case screw mounted diodes? I’m thinking a 1N4007 would probably do the job but thought it would be wise to ask before jumping in. The originals look pretty hefty so really not sure? Any suggestions would be most welcome. Thank you, Mauro
Sent from my iPhone
No to the 1N4007c they are only rated at 1 Amp.
To check the diodes unsolder one lead and check with your ohmmeter/continuity tester. May show something in one direction but nothing in the other - this would be good sign for the diode.
More likely a shorted electrolytic cap!
John :-#)# John’s Jukes Ltd. www.flippers.com
On Oct 23, 2024, at 6:27 PM, M De Simone via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hello From Sunny Ontario Canada today!
I’ve been given a W544 to look at as it has replaced the -28vdc output with 66vac which (I’m sure) means that diodes SR1 and SR2 are shorted. Never having dealt with this previously, My question is what is a good replacement for these metal case screw mounted diodes? I’m thinking a 1N4007 would probably do the job but thought it would be wise to ask before jumping in. The originals look pretty hefty so really not sure? Any suggestions would be most welcome. Thank you, Mauro
Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
John, I never considered that but will check capacitors and re-check diodes tomorrow. Thank you for the speedy response! Mauro
Sent from my iPhone
On Oct 23, 2024, at 9:55 PM, John Robertson via Jukebox-list jukebox-list@lists.netlojix.com wrote:
No to the 1N4007c they are only rated at 1 Amp.
To check the diodes unsolder one lead and check with your ohmmeter/continuity tester. May show something in one direction but nothing in the other - this would be good sign for the diode.
More likely a shorted electrolytic cap!
John :-#)# John’s Jukes Ltd. www.flippers.com
On Oct 23, 2024, at 6:27 PM, M De Simone via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hello From Sunny Ontario Canada today!
I’ve been given a W544 to look at as it has replaced the -28vdc output with 66vac which (I’m sure) means that diodes SR1 and SR2 are shorted. Never having dealt with this previously, My question is what is a good replacement for these metal case screw mounted diodes? I’m thinking a 1N4007 would probably do the job but thought it would be wise to ask before jumping in. The originals look pretty hefty so really not sure? Any suggestions would be most welcome. Thank you, Mauro
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Ok, so I have removed the diodes and found the following resistance results: Diode 1: 145 ohms, (leads reversed) 11.6 meg Diode 2: 130 ohms, (leads reversed) 1.2 meg The reading slowly decreases the longer I wait but this was after a few seconds. I then remembered I had a transistor tester that tests diode leakage, diode 1 tested good and diode 2 showed significant leakage. I will likely change the associated capacitors but I think I will need to replace the diodes as well. So if anyone (John) would be able to recommend a good replacement for SR1 and SR2 (1.6a) that would help me out. Thanks again, Mauro
Sent from my iPhone
On Oct 23, 2024, at 10:01 PM, M De Simone m.desimone@rogers.com wrote:
John, I never considered that but will check capacitors and re-check diodes tomorrow. Thank you for the speedy response! Mauro
Sent from my iPhone
On Oct 23, 2024, at 9:55 PM, John Robertson via Jukebox-list jukebox-list@lists.netlojix.com wrote:
No to the 1N4007c they are only rated at 1 Amp.
To check the diodes unsolder one lead and check with your ohmmeter/continuity tester. May show something in one direction but nothing in the other - this would be good sign for the diode.
More likely a shorted electrolytic cap!
John :-#)# John’s Jukes Ltd. www.flippers.com
On Oct 23, 2024, at 6:27 PM, M De Simone via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hello From Sunny Ontario Canada today!
I’ve been given a W544 to look at as it has replaced the -28vdc output with 66vac which (I’m sure) means that diodes SR1 and SR2 are shorted. Never having dealt with this previously, My question is what is a good replacement for these metal case screw mounted diodes? I’m thinking a 1N4007 would probably do the job but thought it would be wise to ask before jumping in. The originals look pretty hefty so really not sure? Any suggestions would be most welcome. Thank you, Mauro
Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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Hi Mauro,
SR1 and SR2 are 18A diodes...
I have them in stock:
flippers.com
Diode Rectifier and Bracket <#>
Diode Rectifier and Bracket
🔗 https://flippers.com/catalog_oc/diode-rectifier-and-bracket-120696?search=12... https://flippers.com/catalog_oc/diode-rectifier-and-bracket-120696?search=120696
John :-#)#
On 2024-10-25 11:40 a.m., M De Simone via Jukebox-list wrote:
Ok, so I have removed the diodes and found the following resistance results: Diode 1: 145 ohms, (leads reversed) 11.6 meg Diode 2: 130 ohms, (leads reversed) 1.2 meg The reading slowly decreases the longer I wait but this was after a few seconds. I then remembered I had a transistor tester that tests diode leakage, diode 1 tested good and diode 2 showed significant leakage. I will likely change the associated capacitors but I think I will need to replace the diodes as well. So if anyone (John) would be able to recommend a good replacement for SR1 and SR2 (1.6a) that would help me out. Thanks again, Mauro
Sent from my iPhone
On Oct 23, 2024, at 10:01 PM, M De Simonem.desimone@rogers.com wrote:
John, I never considered that but will check capacitors and re-check diodes tomorrow. Thank you for the speedy response! Mauro
Sent from my iPhone
On Oct 23, 2024, at 9:55 PM, John Robertson via Jukebox-listjukebox-list@lists.netlojix.com wrote:
No to the 1N4007c they are only rated at 1 Amp.
To check the diodes unsolder one lead and check with your ohmmeter/continuity tester. May show something in one direction but nothing in the other - this would be good sign for the diode.
More likely a shorted electrolytic cap!
John :-#)# John’s Jukes Ltd. www.flippers.com
On Oct 23, 2024, at 6:27 PM, M De Simone via Jukebox-listjukebox-list@lists.netlojix.com wrote:
Hello From Sunny Ontario Canada today!
I’ve been given a W544 to look at as it has replaced the -28vdc output with 66vac which (I’m sure) means that diodes SR1 and SR2 are shorted. Never having dealt with this previously, My question is what is a good replacement for these metal case screw mounted diodes? I’m thinking a 1N4007 would probably do the job but thought it would be wise to ask before jumping in. The originals look pretty hefty so really not sure? Any suggestions would be most welcome. Thank you, Mauro
Sent from my iPhone _______________________________________________ Jukebox-list mailing list --jukebox-list@lists.netlojix.com To unsubscribe send an email tojukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives:http://jukebox.markmail.org/
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Oops they are 18 amp, not 1.8 amp!
Sent from my iPhone
On Oct 25, 2024, at 2:41 PM, M De Simone m.desimone@rogers.com wrote:
Ok, so I have removed the diodes and found the following resistance results: Diode 1: 145 ohms, (leads reversed) 11.6 meg Diode 2: 130 ohms, (leads reversed) 1.2 meg The reading slowly decreases the longer I wait but this was after a few seconds. I then remembered I had a transistor tester that tests diode leakage, diode 1 tested good and diode 2 showed significant leakage. I will likely change the associated capacitors but I think I will need to replace the diodes as well. So if anyone (John) would be able to recommend a good replacement for SR1 and SR2 (1.6a) that would help me out. Thanks again, Mauro
Sent from my iPhone
On Oct 23, 2024, at 10:01 PM, M De Simone m.desimone@rogers.com wrote:
John, I never considered that but will check capacitors and re-check diodes tomorrow. Thank you for the speedy response! Mauro
Sent from my iPhone
On Oct 23, 2024, at 9:55 PM, John Robertson via Jukebox-list jukebox-list@lists.netlojix.com wrote:
No to the 1N4007c they are only rated at 1 Amp.
To check the diodes unsolder one lead and check with your ohmmeter/continuity tester. May show something in one direction but nothing in the other - this would be good sign for the diode.
More likely a shorted electrolytic cap!
John :-#)# John’s Jukes Ltd. www.flippers.com
On Oct 23, 2024, at 6:27 PM, M De Simone via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hello From Sunny Ontario Canada today!
I’ve been given a W544 to look at as it has replaced the -28vdc output with 66vac which (I’m sure) means that diodes SR1 and SR2 are shorted. Never having dealt with this previously, My question is what is a good replacement for these metal case screw mounted diodes? I’m thinking a 1N4007 would probably do the job but thought it would be wise to ask before jumping in. The originals look pretty hefty so really not sure? Any suggestions would be most welcome. Thank you, Mauro
Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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Just wanted to close the loop on this one for future reference. I replaced 4 capacitors in the circuit and one of the large metal mounted diodes. Turns out there was an NTE cross for it (NTE5962). Now it’s putting out the correct DC voltage.
Sent from my iPhone
On Oct 25, 2024, at 3:05 PM, M De Simone m.desimone@rogers.com wrote:
Oops they are 18 amp, not 1.8 amp!
Sent from my iPhone
On Oct 25, 2024, at 2:41 PM, M De Simone m.desimone@rogers.com wrote:
Ok, so I have removed the diodes and found the following resistance results: Diode 1: 145 ohms, (leads reversed) 11.6 meg Diode 2: 130 ohms, (leads reversed) 1.2 meg The reading slowly decreases the longer I wait but this was after a few seconds. I then remembered I had a transistor tester that tests diode leakage, diode 1 tested good and diode 2 showed significant leakage. I will likely change the associated capacitors but I think I will need to replace the diodes as well. So if anyone (John) would be able to recommend a good replacement for SR1 and SR2 (1.6a) that would help me out. Thanks again, Mauro
Sent from my iPhone
On Oct 23, 2024, at 10:01 PM, M De Simone m.desimone@rogers.com wrote:
John, I never considered that but will check capacitors and re-check diodes tomorrow. Thank you for the speedy response! Mauro
Sent from my iPhone
On Oct 23, 2024, at 9:55 PM, John Robertson via Jukebox-list jukebox-list@lists.netlojix.com wrote:
No to the 1N4007c they are only rated at 1 Amp.
To check the diodes unsolder one lead and check with your ohmmeter/continuity tester. May show something in one direction but nothing in the other - this would be good sign for the diode.
More likely a shorted electrolytic cap!
John :-#)# John’s Jukes Ltd. www.flippers.com
On Oct 23, 2024, at 6:27 PM, M De Simone via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hello From Sunny Ontario Canada today!
I’ve been given a W544 to look at as it has replaced the -28vdc output with 66vac which (I’m sure) means that diodes SR1 and SR2 are shorted. Never having dealt with this previously, My question is what is a good replacement for these metal case screw mounted diodes? I’m thinking a 1N4007 would probably do the job but thought it would be wise to ask before jumping in. The originals look pretty hefty so really not sure? Any suggestions would be most welcome. Thank you, Mauro
Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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M De Simone