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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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replacing capacitor in PSU
I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use
any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. |
#2
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orange wrote:
I cannot find anywhere replacement capacitor (680 uF, 200V). Look harder. Try Googling. http://www.alltronics.com/capacito.htm |
#3
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On 1 Aug 2005 14:13:32 -0700, "orange" put finger
to keyboard and composed: I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. If you are running on 240VAC you could use a single 330uF 400V cap. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
#4
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Franc Zabkar wrote:
If you are running on 240VAC you could use a single 330uF 400V cap. According to the header he's posting from Russia. Does anyone know what the line voltage is there? -- Link to my "Computers for disabled Veterans" project website deleted after threats were telephoned to my church. Michael A. Terrell Central Florida |
#5
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I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. If you are running on 240VAC you could use a single 330uF 400V cap. - Franc Zabkar bad idea. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#6
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On 2 Aug 2005 00:16:03 -0500, me put finger to keyboard
and composed: I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. If you are running on 240VAC you could use a single 330uF 400V cap. - Franc Zabkar bad idea. why? - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
#7
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OK, thanks all, I'll try ordering it from that site (unfortunately it
might get 'lost' in the customs ) BTW, I'm from Serbia and Montenegro and voltage here is 220V. |
#8
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I've ordered them from 'Debco Electronics Inc', very very cheap 2$ per
piece (other places want more than 4$), hope it will not be of bad quality, and that it will arrive in a year or two, heh |
#9
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Any capacitor of same value (or slightly higher) with a higher voltage
rating will do fine. As this is a switch mode supply remember to use 105 degree parts or you'll be replacing that part pretty soon. Dave "orange" wrote in message oups.com... I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. |
#10
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me writes:
I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. If you are running on 240VAC you could use a single 330uF 400V cap. - Franc Zabkar bad idea. No necessarily. If running a dual voltage (120/240 VAC) power supply on 240 VAC, the input circuit forms a bridge rectifier with its output across the two main filter caps (in series). The quesiton is what happens with the centertap. If it's not used for anything else, then this approach can work, but you'd have to trace the input circuit completely to be sure it won't simply release smoke. --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/ Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/ +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html Note: These links are hopefully temporary until we can sort out the excessive traffic on Repairfaq.org. Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#11
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me wrote:
I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. If you are running on 240VAC you could use a single 330uF 400V cap. bad idea. In most switched mode power supplies, in 220V operation, the primary capacitors are placed in series, so in that case the idea is actually very usefull. You have to disable the voltage switch, of course. --- Met vriendelijke groet, Maarten Bakker. |
#12
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On 02 Aug 2005 08:59:36 -0400, Sam Goldwasser
put finger to keyboard and composed: me writes: I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. If you are running on 240VAC you could use a single 330uF 400V cap. - Franc Zabkar bad idea. No necessarily. If running a dual voltage (120/240 VAC) power supply on 240 VAC, the input circuit forms a bridge rectifier with its output across the two main filter caps (in series). The quesiton is what happens with the centertap. If it's not used for anything else, then this approach can work, but you'd have to trace the input circuit completely to be sure it won't simply release smoke. In most PSUs that I've seen one could simply replace one of the two caps with a single 400V type, link out the remaining one, and then remove the two redundant wires going to the 240/120 selector switch. Some designs may have MOVs in parallel with the caps, in which case these should be removed. By coincidence, yesterday I dismantled a Sony TV set which had a PSU which was configurable for single or dual capacitors. The Australian version of this set had a single 560uF 400V cap, and the other cap was linked out. The PCB real estate allotted to the 400V cap was slightly larger than for the 200V one. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
#13
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#14
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, so in that case the idea is actually
very usefull. You have to disable the voltage switch, of course. an important note... ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#15
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On 3 Aug 2005 17:37:54 -0500, me put finger to keyboard
and composed: , so in that case the idea is actually very usefull. You have to disable the voltage switch, of course. an important note... Not really. In a 240V system the voltage switch is open. I'd still remove it, though, but for reasons of redundancy and added security, not necessity. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
#16
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"orange" wrote in message oups.com... I cannot find anywhere replacement capacitor (680 uF, 200V). Can I use any other value for capacitance? I need two of them replaced (identical), they are inside switching power supply, the biggest ones. You can use one of same or higher voltage and similar uF rating, doesn't have to be exact. |
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