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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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Another Sony CCD-F recap question (seems easy)
Hi there,
I have currently two problems with my CCD-F355E camcorder with the famous VA-46 board and it's leaky caps. It is, surprisingly, in quite good condition though the boards have never seen a rework (yet ), recording is suberb, has only minor playback problems: 1. distorted audio from RCA-jack, though audio from headphones-jack is crystal-clear with absolutely no distortions (?!?): I suspect C209 (47u, 6v) which is soldered right in front of the audio RCA-output, there can't be much between the good audio-signal of the headphones and the bad from the RCA (if I only had a schematic of the VA-46), can there ? 2. intermittent color in playback only, direct picture from camera-head is free from color-flickering, several sources say C311 (1u, 50V) tried to track bad caps with freeze spray already, no luck any hints ? regards, adrian |
#2
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Another Sony CCD-F recap question (seems easy)
an ESR meter will reveal the faulty electrolytics quickly and easily......
otherwise, substitution and replacement are your only viable troubleshooting method. -- Best Regards, Daniel Sofie Electronics Supply & Repair ------------------------------- "Adrian" wrote in message ... Hi there, I have currently two problems with my CCD-F355E camcorder with the famous VA-46 board and it's leaky caps. It is, surprisingly, in quite good condition though the boards have never seen a rework (yet ), recording is suberb, has only minor playback problems: 1. distorted audio from RCA-jack, though audio from headphones-jack is crystal-clear with absolutely no distortions (?!?): I suspect C209 (47u, 6v) which is soldered right in front of the audio RCA-output, there can't be much between the good audio-signal of the headphones and the bad from the RCA (if I only had a schematic of the VA-46), can there ? 2. intermittent color in playback only, direct picture from camera-head is free from color-flickering, several sources say C311 (1u, 50V) tried to track bad caps with freeze spray already, no luck any hints ? regards, adrian |
#3
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Another Sony CCD-F recap question (seems easy)
"Sofie" wrote in message ... Adrian: Generally speaking, if you have done all the work to get access to the board in this cam-corder, why not do a complete re-cap job?? -- Precisely. Bad caps in camcorders is bad news, and replacing only the defective ones is a pointless exercise. The covers will be off more than they're on as more caps fail on a weekly basis. Dave |
#4
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Another Sony CCD-F recap question (seems easy)
"Sofie" wrote to "All" (14 Jul 03 07:18:18)
--- on the topic of " Another Sony CCD-F recap question (seems easy)" Some people say E ffective S eries R esistance but I much prefer E quivalent S eries R esistance I wonder what Bob Parker calls it? So From: "Sofie" So Adrian: So What you need is an ESR meter...... that measures So E quivilent S eries R esistance .... Which sparks some mnemonic circuitry. |
#5
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Another Sony CCD-F recap question (seems easy)
Hi Sofie,
Adrian: What you need is an ESR meter...... that measures E quivilent S eries R esistance Most LCR meters require capacitor removal (or at least lifting one leg) from the circuitry to make accurate measurements... at that point you might as well replace it with a new component. Many meters that measure the capacity value do NOT measure ESR. The capacity value can read exactly what it should and the electrolytic can still have high ESR and not work in a circuit. If you do not have an ESR meter, the only effective troubleshooting method is substitution and replacement of the suspected capacitor. Generally speaking, if you have done all the work to get access to the board in this cam-corder, why not do a complete re-cap job?? -- I understand, I have heard so much about ESR-meters, but at the moment there are a bit too expensive for me. I'm not a pro but I'm successfully fixing my stuff on my own (thanks to sci.electronics.repair, the repairfaq and many tech-websites). I know, I should recap the whole board, but you know these SONY camcorders have around 80 caps inside which is really time-consuming and I'm not quite a friend of SMD-soldering thus I want to spot the bad caps only and have a good friend who is expirienced in SMD do the job. But I'm gonna ask him, he might have an ESR-meter greetings, adrian |
#6
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Another Sony CCD-F recap question (seems easy)
Hi Dave,
If it's your personal camera, why not replace them with standard miniature electrolytics? The purists might have a go at me but I find they last longer and are a lot easier to install with standard tools. It's my personal camera, but I'm a purist and soldering standard caps onto the board would be horror for *g* greetings, adrian |
#7
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Another Sony CCD-F recap question (seems easy)
in a ccd-f the only good cap is one that was replaced.even in units that
work they all check bad esr. "Sofie" wrote in message ... Adrian: What you need is an ESR meter...... that measures E quivilent S eries R esistance Most LCR meters require capacitor removal (or at least lifting one leg) from the circuitry to make accurate measurements... at that point you might as well replace it with a new component. Many meters that measure the capacity value do NOT measure ESR. The capacity value can read exactly what it should and the electrolytic can still have high ESR and not work in a circuit. If you do not have an ESR meter, the only effective troubleshooting method is substitution and replacement of the suspected capacitor. Generally speaking, if you have done all the work to get access to the board in this cam-corder, why not do a complete re-cap job?? -- Best Regards, Daniel Sofie Electronics Supply & Repair ------------------------------------ "Adrian" wrote in message ... Hi Sofie, an ESR meter will reveal the faulty electrolytics quickly and easily...... otherwise, substitution and replacement are your only viable troubleshooting method. -- I could borrow an LCR-meter which measures the capacity, do you think it measures the caps' capacity correctly without having to remove them from the board ? thx, adrian |
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