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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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color camcorder lost color recording capability JVC GR-C7U
I am re-posting my question as noone has answered it yet.
I have aquired a late 80's JVC VHS-C camcorder. I did some test recordings on it and found that it records only in B&W. But the B&W picture is clean and sharp when played in the cam and through the line out on a color monitor. I also played the C tape on my year old Sony VHS VCR and get excellent results. Just no color. The line out from the cam directly is in color. The CCD is nice and sharp for a cam from the late 80's. My question: Is it somthing that can be fixed or is it some signal processing IC that is gone?? Where can I download a service manual for this model in .PDF format? Arvis. |
#2
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Almost certainly its the old/leaky electrolytic capacitors causing your
fault. almost all these oldies are now dead because of this. They're all surface mount caps and the chances of acid having eaten the copper print (or worse the plate through hole) is quite high. Good luck if you try to fix it. start with the 4.7 and 10 mic caps on the colour process pcb. I've never needed to change Ic's on these types of camcorders, they never fail.!! the manual was only ever issued on paper. if you really need pages copied, then post me back and I can copy the needed pages (tell me the board numbers) AW "Arvis N." wrote in message om... I am re-posting my question as noone has answered it yet. I have aquired a late 80's JVC VHS-C camcorder. I did some test recordings on it and found that it records only in B&W. But the B&W picture is clean and sharp when played in the cam and through the line out on a color monitor. I also played the C tape on my year old Sony VHS VCR and get excellent results. Just no color. The line out from the cam directly is in color. The CCD is nice and sharp for a cam from the late 80's. My question: Is it somthing that can be fixed or is it some signal processing IC that is gone?? Where can I download a service manual for this model in .PDF format? Arvis. |
#3
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Thanks for the info "JVC Dude". I don't think that I'll want to take
the cam apart. I'd rather have it working in B&W then not at all. I am never going to use it for any serious recording anyway. I was just curious as to what could be wrong. Thanks again. A. "JVC dude" wrote in message ... Almost certainly its the old/leaky electrolytic capacitors causing your fault. almost all these oldies are now dead because of this. They're all surface mount caps and the chances of acid having eaten the copper print (or worse the plate through hole) is quite high. Good luck if you try to fix it. start with the 4.7 and 10 mic caps on the colour process pcb. I've never needed to change Ic's on these types of camcorders, they never fail.!! the manual was only ever issued on paper. if you really need pages copied, then post me back and I can copy the needed pages (tell me the board numbers) AW "Arvis N." wrote in message om... I am re-posting my question as noone has answered it yet. I have aquired a late 80's JVC VHS-C camcorder. I did some test recordings on it and found that it records only in B&W. But the B&W picture is clean and sharp when played in the cam and through the line out on a color monitor. I also played the C tape on my year old Sony VHS VCR and get excellent results. Just no color. The line out from the cam directly is in color. The CCD is nice and sharp for a cam from the late 80's. My question: Is it somthing that can be fixed or is it some signal processing IC that is gone?? Where can I download a service manual for this model in .PDF format? Arvis. |
#4
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If you run the camera for some hours the caps can often improve. and the
colour can return. Worth a try. Its usually since these units only get used twice a year that the caps fail so often. Run them every 1-2 months and they last longer If you can smell ammonia when its been running for some time however its a sign of leaky ones. AW "Arvis N." wrote in message m... Thanks for the info "JVC Dude". I don't think that I'll want to take the cam apart. I'd rather have it working in B&W then not at all. I am never going to use it for any serious recording anyway. I was just curious as to what could be wrong. Thanks again. A. "JVC dude" wrote in message ... Almost certainly its the old/leaky electrolytic capacitors causing your fault. almost all these oldies are now dead because of this. They're all surface mount caps and the chances of acid having eaten the copper print (or worse the plate through hole) is quite high. Good luck if you try to fix it. start with the 4.7 and 10 mic caps on the colour process pcb. I've never needed to change Ic's on these types of camcorders, they never fail.!! the manual was only ever issued on paper. if you really need pages copied, then post me back and I can copy the needed pages (tell me the board numbers) AW "Arvis N." wrote in message om... I am re-posting my question as noone has answered it yet. I have aquired a late 80's JVC VHS-C camcorder. I did some test recordings on it and found that it records only in B&W. But the B&W picture is clean and sharp when played in the cam and through the line out on a color monitor. I also played the C tape on my year old Sony VHS VCR and get excellent results. Just no color. The line out from the cam directly is in color. The CCD is nice and sharp for a cam from the late 80's. My question: Is it somthing that can be fixed or is it some signal processing IC that is gone?? Where can I download a service manual for this model in .PDF format? Arvis. |
#5
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"Arvis N." wrote in message m... Thanks for the info "JVC Dude". I don't think that I'll want to take the cam apart. I'd rather have it working in B&W then not at all. I am never going to use it for any serious recording anyway. I was just curious as to what could be wrong. Thanks again. If you don't replace the capacitors it'll soon cease to function at all and the damage will likely leave it unrepairable if it's not already. The malfunction is partially caused by leaked electrolyte corroding out the traces on the circuit boards and it'll keep spreading and rotting like cancer. |
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