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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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"William R. Walsh" m
wrote in news:Rp9%c.138689$Fg5.86273@attbi_s53: Interesting. I never knew TDK actually made parts. I thought they were more of a company that makes media. I guess it's really the electronics that differ between units as the mechanical parts seems easier to spot. Yep, TDK does make some parts. I don't think they make anything particularly complex, but I've seen a lot of "simple" electronic parts that bear the TDK name. Hmmm, I know they made stuff like RF Filters but I never knew they made internal parts since even their cd-rom writers are made by Sanyo. So I guess TDK makes stuff like things that you can visibly see by looking at the transport. Cheers, Vince |
#42
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http://www.manuals4you.com On Mon, 6 Sep 2004 15:22:09 -0500, "Mark D. Zacharias" wrote: "Vincent Poy" wrote in message 4.154... "Mark D. Zacharias" wrote in : "Vincent Poy" wrote in message .154... Which 2 or 3 small screws are you referring to? I have the bottom off now and it pretty much looks like the pics he http://www.studiosoundelectronics.com/mbk-42.htm Thanks! Cheers, Vince "JVC Dude" wrote in : Ok I've just researched the HRS8000. we never had that here. Its the same mech as our HRD530 but with SVHS from 1988 ish Forget the stuff about the sensors, thats on much more modern stuff like our HRS7000/8600 the nearest model numbers. Unplug it, take the bottom off, and carefully tighten the 2 or 3 small screws fastening the green pcb's onto the bottom of the mech, it will probably be a loose one causing a bad earth. and perhaps your symptoms. If not then you could have numerous other things like a shorting pole on the capstan motor etc. Also as reported by Mark, the membrane switches can be troublesome, but usually just inactive buttons. they gave most trouble when juices were spilt into them! Since this mech was used in Fergusons-UK (don't know what brand US have for that- Thomson?) and Toshibas there should be many time served VCR tech out there with experience so it doesn't have to be a JVC seervice centre necessarily. Hope this helps AW "Vincent Poy" wrote in message .154... I didn't realize you were in Europe but from what you're saying, it seems like it doesn't really need any parts replaced but rather just labor. There is a place locally that charges $US35 + labor but I know they are n't factory authorized and I wonder if being factory authorized will make a difference or not. Where exactly is the right hand sensor located or what does it look like? Since you might be familar with this, I had a Mitsubishi HS-U70 SVHS VCR that failed a few years back and it had like missing audio as well as missing color and the problem seemed to have been bad capacitors but when I shipped the thing to be repaired, it was fixed but shipping caused the Control Audio Head to not be aligned and the guy I think readjusted it. It will play any tapes it records but when I take the tape to the JVC HR- S8000U, it will only show scrolling black & white with distorted audio and also, any tape that the Mitsubishi recorded on can't be re-recorded with the JVC, is this just a alignment problem as the guy that fixed it didn't have the factory jig for proper alignment. Cheers, Vince "JVC Dude" wrote in : I would suspect that the soldering under the right hand sensor may be dry jointed . If you aren't familiar with repairing equipment then don't try to cure this yourself, since it involves stripping the deck out, then removing the main board (although some models access from underneath may be possible.) Its not easy!! Also the mains psu capacitor can retain approx 380Volts- just waiting to shake hands with anyone who doesn't know wheres safe and wheres not! Your supposition is correct re the FF button it would FF when turned on or if 2 buttons are effectively pressed, then other odd symptoms may occur. Remember as I said these units are very sensitive to light. There was a mod to cover the right sensor (a slim 2" black LED type of thing standing centre right of the mechanism)- its use is primarily to detect if the tape is at the beginning and then shuttle forward off it. As to what you should pay, I would think £30-£40 to cover an hours time would be typical- however it may not be this sensor and only an engineer with the top off, probing around could really correctly diagnose this. Andrew "Vincent Poy" wrote in message .154... This VCR doesn't have a jog wheel. If if was the FF button then wouldn't it FF even in the stop position? Cheers, Vince "Mark D. Zacharias" wrote in : Sounds to me like the FF button or jog wheel may have a problem. Seen things like this before. Mark Z. "Vincent Poy" wrote in message .154... Vincent Poy wrote in . 154: "JVC dude" wrote in : Hi Vincent, Is there a lot of light getting in through the top/side? these decks have optic sensors and can be tripped into doing strange modes with light otherwise sounds like a faulty switch contact or something similar. when you say play button do you mean on the set or the remote. ~Its possible the remote if someting was spilt into it may do that. if its not related to the remote then there may be a faulty switch on the front panel. its certainly not a common problem. I presume you've unplugged and plugged in again to reset the machine! Other possible causes, dirty mode switch contacts, or poss a capstan motor control fault , but that would be very rare. its more likely to be one of the above. hope this helps AW Hi AW: Right now, there has to be a lot of light as I was trying to see if things are working with the cover off but originally, the cover was on when the problem happened. What is weird is that randomly, it will decide to play a tape correctly. As for the play button, I'm talking about the button on the front panel and not the remote as I haven't used my remote in a few years. I've already did the plug/unplug a few times just to make sure that wasn't the problem. I'm just trying to figure out will this be a expensive repair since I see a lot of repairers that aren't factory authorized but don't most problems need a service manual or will equipment tell them what is wrong? Since it seems lots of places have a fixed labor rate but then you have to pay for parts and I hope they don't randomly change out parts. Cheers, Vince I just put the cover back on and the first play of the tape plays normally but then the next play, it does the same Play + Fast Forward mode again. Cheers, Vince They definitely had some problems with bad grounding on this chassis, the small screws on the bottom PC board(s). This would usually do things like trying to activate the tape loading when no tape was in the carriage, and make the "Tape In" indicator light up in the display, and initiate Rewind if there was a tape in the mech. Mark Z. Got a question... After getting the metal cover off the bottom, how does one get the black plastic that is part of the chassis as it seems to cover a lot of the parts. Cheers, Vince As I recall, the entire deck is loosened from the top side and tilted up and out a bit. No fun. 4 or 5 large screws hold the deck in place. mz Want to Fix Something? http://www.manuals4you.com |
#43
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http://www.manuals4you.com On Mon, 6 Sep 2004 15:22:09 -0500, "Mark D. Zacharias" wrote: "Vincent Poy" wrote in message 4.154... "Mark D. Zacharias" wrote in : "Vincent Poy" wrote in message .154... Which 2 or 3 small screws are you referring to? I have the bottom off now and it pretty much looks like the pics he http://www.studiosoundelectronics.com/mbk-42.htm Thanks! Cheers, Vince "JVC Dude" wrote in : Ok I've just researched the HRS8000. we never had that here. Its the same mech as our HRD530 but with SVHS from 1988 ish Forget the stuff about the sensors, thats on much more modern stuff like our HRS7000/8600 the nearest model numbers. Unplug it, take the bottom off, and carefully tighten the 2 or 3 small screws fastening the green pcb's onto the bottom of the mech, it will probably be a loose one causing a bad earth. and perhaps your symptoms. If not then you could have numerous other things like a shorting pole on the capstan motor etc. Also as reported by Mark, the membrane switches can be troublesome, but usually just inactive buttons. they gave most trouble when juices were spilt into them! Since this mech was used in Fergusons-UK (don't know what brand US have for that- Thomson?) and Toshibas there should be many time served VCR tech out there with experience so it doesn't have to be a JVC seervice centre necessarily. Hope this helps AW "Vincent Poy" wrote in message .154... I didn't realize you were in Europe but from what you're saying, it seems like it doesn't really need any parts replaced but rather just labor. There is a place locally that charges $US35 + labor but I know they are n't factory authorized and I wonder if being factory authorized will make a difference or not. Where exactly is the right hand sensor located or what does it look like? Since you might be familar with this, I had a Mitsubishi HS-U70 SVHS VCR that failed a few years back and it had like missing audio as well as missing color and the problem seemed to have been bad capacitors but when I shipped the thing to be repaired, it was fixed but shipping caused the Control Audio Head to not be aligned and the guy I think readjusted it. It will play any tapes it records but when I take the tape to the JVC HR- S8000U, it will only show scrolling black & white with distorted audio and also, any tape that the Mitsubishi recorded on can't be re-recorded with the JVC, is this just a alignment problem as the guy that fixed it didn't have the factory jig for proper alignment. Cheers, Vince "JVC Dude" wrote in : I would suspect that the soldering under the right hand sensor may be dry jointed . If you aren't familiar with repairing equipment then don't try to cure this yourself, since it involves stripping the deck out, then removing the main board (although some models access from underneath may be possible.) Its not easy!! Also the mains psu capacitor can retain approx 380Volts- just waiting to shake hands with anyone who doesn't know wheres safe and wheres not! Your supposition is correct re the FF button it would FF when turned on or if 2 buttons are effectively pressed, then other odd symptoms may occur. Remember as I said these units are very sensitive to light. There was a mod to cover the right sensor (a slim 2" black LED type of thing standing centre right of the mechanism)- its use is primarily to detect if the tape is at the beginning and then shuttle forward off it. As to what you should pay, I would think £30-£40 to cover an hours time would be typical- however it may not be this sensor and only an engineer with the top off, probing around could really correctly diagnose this. Andrew "Vincent Poy" wrote in message .154... This VCR doesn't have a jog wheel. If if was the FF button then wouldn't it FF even in the stop position? Cheers, Vince "Mark D. Zacharias" wrote in : Sounds to me like the FF button or jog wheel may have a problem. Seen things like this before. Mark Z. "Vincent Poy" wrote in message .154... Vincent Poy wrote in . 154: "JVC dude" wrote in : Hi Vincent, Is there a lot of light getting in through the top/side? these decks have optic sensors and can be tripped into doing strange modes with light otherwise sounds like a faulty switch contact or something similar. when you say play button do you mean on the set or the remote. ~Its possible the remote if someting was spilt into it may do that. if its not related to the remote then there may be a faulty switch on the front panel. its certainly not a common problem. I presume you've unplugged and plugged in again to reset the machine! Other possible causes, dirty mode switch contacts, or poss a capstan motor control fault , but that would be very rare. its more likely to be one of the above. hope this helps AW Hi AW: Right now, there has to be a lot of light as I was trying to see if things are working with the cover off but originally, the cover was on when the problem happened. What is weird is that randomly, it will decide to play a tape correctly. As for the play button, I'm talking about the button on the front panel and not the remote as I haven't used my remote in a few years. I've already did the plug/unplug a few times just to make sure that wasn't the problem. I'm just trying to figure out will this be a expensive repair since I see a lot of repairers that aren't factory authorized but don't most problems need a service manual or will equipment tell them what is wrong? Since it seems lots of places have a fixed labor rate but then you have to pay for parts and I hope they don't randomly change out parts. Cheers, Vince I just put the cover back on and the first play of the tape plays normally but then the next play, it does the same Play + Fast Forward mode again. Cheers, Vince They definitely had some problems with bad grounding on this chassis, the small screws on the bottom PC board(s). This would usually do things like trying to activate the tape loading when no tape was in the carriage, and make the "Tape In" indicator light up in the display, and initiate Rewind if there was a tape in the mech. Mark Z. Got a question... After getting the metal cover off the bottom, how does one get the black plastic that is part of the chassis as it seems to cover a lot of the parts. Cheers, Vince As I recall, the entire deck is loosened from the top side and tilted up and out a bit. No fun. 4 or 5 large screws hold the deck in place. mz Want to Fix Something? http://www.manuals4you.com |
#44
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"Yikes!ItsIke" wrote:
[...snip] 210+ lines of quotes for a URL reply? |
#45
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"Yikes!ItsIke" wrote:
[...snip] 210+ lines of quotes for a URL reply? |