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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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Can power supply rebuild kit save this VCR?
Charles Packer:
The power supply rebuild kits do not necessarily "fix" all power supply issues but they do cover some of the most frequent failure modes and for the newbie tech that does not have a lot of electronics troubleshooting knowledge, repair experience and component testing know-how and test equipment, it may offer a good chance for you to repair your power supply.... but as you pointed out you will be replacing parts that may not need to be replaced. -- Best Regards, Daniel Sofie Electronics Supply & Repair -------------------------- "Charles Packer" wrote in message om... Is this repair project worthwhile, given the circumstances? Sony VCR, model SLV690HF, died suddenly. It worked fine up until I pushed the power switch and eject button on the front panel almost simultaneously (I don't use any VCR much; it's my wife's preoccupation). Now it's absolutely dead. I suspect the power supply, perhaps a semiconductor therein, given the symptoms. The fuse is okay, and I see that there's one 'o them newfangled switching power supplies. My electronics hobbyist years ended before they became prevalent, so I don't know a thing about them. There's a lot in this newsgroup about related issues. One posting alerted me to one other circumstance that might be relevant: It mentioned that the power supply runs hot. In the last year, it's been powered on more than off because I rearranged the connections such that it has to be on whenever TV is being watched. The notion of a power supply rebuild kit looks attractive, and I found my way to the Web site of Studio Sound Electronics. For less than $20 for the kit and two or three hours work, it would seem worth it to do the repair. The VCR worked fine for eight years, and cost $270 new. Assuming that it is the power supply, I guess I need to know two probabilities to decide if it's worth it to order the kit and get to work: 1. That the failed component is a semiconductor (to reduce the number of parts I'd have to remove and replace). 2. That the rebuild kit will include a replacement for it. |
#2
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Can power supply rebuild kit save this VCR?
On Thu, 18 Mar 2004 05:38:49 -0800, Charles Packer wrote:
Is this repair project worthwhile, given the circumstances? Sony VCR, model SLV690HF, died suddenly. It worked fine up until I pushed the power switch and eject button on the front panel almost simultaneously (I don't use any VCR much; it's my wife's preoccupation). Now it's absolutely dead. I suspect the power supply, perhaps a semiconductor therein, given the symptoms. The fuse is okay, and I see that there's one 'o them newfangled switching power supplies. My electronics hobbyist years ended before they became prevalent, so I don't know a thing about them. There's a lot in this newsgroup about related issues. One posting alerted me to one other circumstance that might be relevant: It mentioned that the power supply runs hot. In the last year, it's been powered on more than off because I rearranged the connections such that it has to be on whenever TV is being watched. The notion of a power supply rebuild kit looks attractive, and I found my way to the Web site of Studio Sound Electronics. For less than $20 for the kit and two or three hours work, it would seem worth it to do the repair. The VCR worked fine for eight years, and cost $270 new. I'm only an electronics newbie, but I just repaired my 7 year old Ferguson/Thomson VCR (which died suddenly, similarly to yours) by replacing all the electrolytic caps in the SMPSU. A set of capacitors is probably cheaper than the "repair kit" (for me, the repair kit was ~27GBP, the capacitors alone were 2.50GBP. It took me an hour to remove and replace the 10 capacitors in my VCR's PSU). As I'm sure you know, electrolytic capacitors can dry out and PSUs are warm places for them to live. Also, there has been a rash of poor-quality electrolytic capacitors over the last few years (I first heard of the problem affecting computer motherboards). If the capacitors don't fix the problem, /then/ think about getting the repair kit (particularly if it includes special semiconductors). Some more experienced hobbyists advised me to get low-ESR, high-ripple specified capacitors. Some may also need to be high temperature capacitors. The same hobbyists also advised me to run it on record for a few hours, then remove the power and check to see if the picture is deteriorating (herring-bone, lines, poor picture quality) and if any of the new capacitors are running very hot to the touch (being careful not to get zapped, of course . Best Regards, Alex. -- Alex Butcher Brainbench MVP for Internet Security: www.brainbench.com Bristol, UK Need reliable and secure network systems? PGP/GnuPG ID:0x271fd950 http://www.assursys.com/ |
#3
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Can power supply rebuild kit save this VCR?
Sony recommends not to rebuilt the older power
supplies, as they "blow up" again! They are very expensive to replace, that is, if it's the module type! Rono. |
#4
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Can power supply rebuild kit save this VCR?
On Tue, 13 Apr 2004 21:37:20 -0230, Rono wrote:
Sony recommends not to rebuilt the older power supplies, as they "blow up" again! They are very expensive to replace, that is, if it's the module type! I can't speak for Charles, but given my VCR is nearly 7 years old, a non-DIY repair cost of 25GBP+, a replacement cost for a new NICAM deck of 55GBP, attempting a DIY repair for 2.50GBP was the only economic approach other than junking it and buying a replacement. Worth a shot, and I've learnt something along the way. If there's nothing really to lose... Rono. Best Regards, Alex. -- Alex Butcher Brainbench MVP for Internet Security: www.brainbench.com Bristol, UK Need reliable and secure network systems? PGP/GnuPG ID:0x271fd950 http://www.assursys.com/ |
#5
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Can power supply rebuild kit save this VCR?
Sony recommends not to rebuilt the older power
supplies, as they "blow up" again! They are very expensive to replace, that is, if it's the module type! Rono. |
#6
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Can power supply rebuild kit save this VCR?
On Thu, 18 Mar 2004 05:38:49 -0800, Charles Packer wrote:
Is this repair project worthwhile, given the circumstances? Sony VCR, model SLV690HF, died suddenly. It worked fine up until I pushed the power switch and eject button on the front panel almost simultaneously (I don't use any VCR much; it's my wife's preoccupation). Now it's absolutely dead. I suspect the power supply, perhaps a semiconductor therein, given the symptoms. The fuse is okay, and I see that there's one 'o them newfangled switching power supplies. My electronics hobbyist years ended before they became prevalent, so I don't know a thing about them. There's a lot in this newsgroup about related issues. One posting alerted me to one other circumstance that might be relevant: It mentioned that the power supply runs hot. In the last year, it's been powered on more than off because I rearranged the connections such that it has to be on whenever TV is being watched. The notion of a power supply rebuild kit looks attractive, and I found my way to the Web site of Studio Sound Electronics. For less than $20 for the kit and two or three hours work, it would seem worth it to do the repair. The VCR worked fine for eight years, and cost $270 new. I'm only an electronics newbie, but I just repaired my 7 year old Ferguson/Thomson VCR (which died suddenly, similarly to yours) by replacing all the electrolytic caps in the SMPSU. A set of capacitors is probably cheaper than the "repair kit" (for me, the repair kit was ~27GBP, the capacitors alone were 2.50GBP. It took me an hour to remove and replace the 10 capacitors in my VCR's PSU). As I'm sure you know, electrolytic capacitors can dry out and PSUs are warm places for them to live. Also, there has been a rash of poor-quality electrolytic capacitors over the last few years (I first heard of the problem affecting computer motherboards). If the capacitors don't fix the problem, /then/ think about getting the repair kit (particularly if it includes special semiconductors). Some more experienced hobbyists advised me to get low-ESR, high-ripple specified capacitors. Some may also need to be high temperature capacitors. The same hobbyists also advised me to run it on record for a few hours, then remove the power and check to see if the picture is deteriorating (herring-bone, lines, poor picture quality) and if any of the new capacitors are running very hot to the touch (being careful not to get zapped, of course . Best Regards, Alex. -- Alex Butcher Brainbench MVP for Internet Security: www.brainbench.com Bristol, UK Need reliable and secure network systems? PGP/GnuPG ID:0x271fd950 http://www.assursys.com/ |
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