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Sony 6800w dismantling
How do I dissamble this unit? I was able to remove the back panel, and I
have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete |
1) You're on the wrong track taking the bottom screws out. Put them back
in. 2) There are six screws holding the front panel on. You'll need a long Philips screwdriver, 8" or more shaft, preferably with magnetic tip to pull the screws out. Without the service manual, you might be able to figure out which ones they are (two are inside the battery compartment lid, but the others are harder to get to.) 3) Buy the service manual for $19.95 at www.manualzone.com/. If you own this radio, you should have one. This is a very service-hostile radio. If you do go through the trouble to take the front panel off, use that time to replace all of the bulbs. "Pete KE9OA" wrote in message ... How do I dissamble this unit? I was able to remove the back panel, and I have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete |
I already checked that website.............it appears they only take PayPal,
so that option is out. I get so many fraudelant e-mails from PayPal informing me about suspicious activity on my account. I don't have a PayPal account, so I will let it rest there. The only other source is A.G. Tannenbaum, but they don't seem to answer their phones. Any other sources? Also, I did see those screws for the front panel, but I need to remove the whole assembly so I can work on the synthesizer. It seems that the LO output from the VFO droops at the high end of the tuning range. When I tune up above "800" on the mechanical dial, the synthesizer goes out of lock. This is on all bands, when they kind of work. I believe that this synthesizer is a dual-loop hybrid vernier synthesizer. I just need to find out where the sampling point for the VFO is. I do have a long Phillips head screwdriver, so I will pull it apart today. Hopefully, the top of the unit separates from the bottom; that is all I need to pull off. Thanks for the info! Pete "Unrevealed Source" wrote in message ... 1) You're on the wrong track taking the bottom screws out. Put them back in. 2) There are six screws holding the front panel on. You'll need a long Philips screwdriver, 8" or more shaft, preferably with magnetic tip to pull the screws out. Without the service manual, you might be able to figure out which ones they are (two are inside the battery compartment lid, but the others are harder to get to.) 3) Buy the service manual for $19.95 at www.manualzone.com/. If you own this radio, you should have one. This is a very service-hostile radio. If you do go through the trouble to take the front panel off, use that time to replace all of the bulbs. "Pete KE9OA" wrote in message ... How do I dissamble this unit? I was able to remove the back panel, and I have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete |
I did manage to get five of the screws out, but there is a hidden screw on
the right side of the front panel. The back panel has an illustration depicting that the screw is just above the front end module, but it appears to be hidden. Does anybody have any ideas? Pete "Pete KE9OA" wrote in message ... I already checked that website.............it appears they only take PayPal, so that option is out. I get so many fraudelant e-mails from PayPal informing me about suspicious activity on my account. I don't have a PayPal account, so I will let it rest there. The only other source is A.G. Tannenbaum, but they don't seem to answer their phones. Any other sources? Also, I did see those screws for the front panel, but I need to remove the whole assembly so I can work on the synthesizer. It seems that the LO output from the VFO droops at the high end of the tuning range. When I tune up above "800" on the mechanical dial, the synthesizer goes out of lock. This is on all bands, when they kind of work. I believe that this synthesizer is a dual-loop hybrid vernier synthesizer. I just need to find out where the sampling point for the VFO is. I do have a long Phillips head screwdriver, so I will pull it apart today. Hopefully, the top of the unit separates from the bottom; that is all I need to pull off. Thanks for the info! Pete "Unrevealed Source" wrote in message ... 1) You're on the wrong track taking the bottom screws out. Put them back in. 2) There are six screws holding the front panel on. You'll need a long Philips screwdriver, 8" or more shaft, preferably with magnetic tip to pull the screws out. Without the service manual, you might be able to figure out which ones they are (two are inside the battery compartment lid, but the others are harder to get to.) 3) Buy the service manual for $19.95 at www.manualzone.com/. If you own this radio, you should have one. This is a very service-hostile radio. If you do go through the trouble to take the front panel off, use that time to replace all of the bulbs. "Pete KE9OA" wrote in message ... How do I dissamble this unit? I was able to remove the back panel, and I have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete |
On some kinds of thingys,there are decals (I have run into them
before,believe you me) that cover some screw heads. cuhulin |
I've seen that before. I'll give it another try. It can't be as bad as the
Nordmende Globetrotter that I just got through repairing! Pete wrote in message ... On some kinds of thingys,there are decals (I have run into them before,believe you me) that cover some screw heads. cuhulin |
Of course not! Especially when I see that somebody from Nigeria and somebody
else from Bosnia is using my "supposed" account. I guess they gave up on sending those "Greetings, I am Doctor Blah Blah Blah" things that offer to let me launder their 5 million dollar inheritance, if I will only give them my bank account number, routing number, etc. It looks like I lost out on that one. I better move much faster next time I get one of those e-mails. What a good deal! The quick and easy way to file bankruptcy. But wait................there's more! Pete "BDK" wrote in message ... In article , says... I already checked that website.............it appears they only take PayPal, so that option is out. I get so many fraudelant e-mails from PayPal informing me about suspicious activity on my account. I don't have a PayPal account, so I will let it rest there. The only other source is A.G. Tannenbaum, but they don't seem to answer their phones. Any other sources? Also, I did see those screws for the front panel, but I need to remove the whole assembly so I can work on the synthesizer. It seems that the LO output from the VFO droops at the high end of the tuning range. When I tune up above "800" on the mechanical dial, the synthesizer goes out of lock. This is on all bands, when they kind of work. I believe that this synthesizer is a dual-loop hybrid vernier synthesizer. I just need to find out where the sampling point for the VFO is. I do have a long Phillips head screwdriver, so I will pull it apart today. Hopefully, the top of the unit separates from the bottom; that is all I need to pull off. Thanks for the info! Pete "Unrevealed Source" wrote in message ... 1) You're on the wrong track taking the bottom screws out. Put them back in. 2) There are six screws holding the front panel on. You'll need a long Philips screwdriver, 8" or more shaft, preferably with magnetic tip to pull the screws out. Without the service manual, you might be able to figure out which ones they are (two are inside the battery compartment lid, but the others are harder to get to.) 3) Buy the service manual for $19.95 at www.manualzone.com/. If you own this radio, you should have one. This is a very service-hostile radio. If you do go through the trouble to take the front panel off, use that time to replace all of the bulbs. "Pete KE9OA" wrote in message ... How do I dissamble this unit? I was able to remove the back panel, and I have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete LOL, you think Paypal is sending those emails? BDK |
It looks like I will need a service manual for this radio. I cleaned the
switches and it does work better, but the PLL is still in need of adjustment. On the ranges below 5MHz, the system goes out of lock most of the time. Same thing when you tune above "900" on the tuning dial. I would surmise that there is probably a VCO coil that needs adjustment, and that right now, the system is set at the edge of its capture range. I'll let you folks know what the problem is once I finish with the repair. Oh, I found out the reason that I couldn't find that final screw...........the documentation indicated that this screw was at a point in the chassis that was 3 inches higher than it really was! Pete "Pete KE9OA" wrote in message ... Of course not! Especially when I see that somebody from Nigeria and somebody else from Bosnia is using my "supposed" account. I guess they gave up on sending those "Greetings, I am Doctor Blah Blah Blah" things that offer to let me launder their 5 million dollar inheritance, if I will only give them my bank account number, routing number, etc. It looks like I lost out on that one. I better move much faster next time I get one of those e-mails. What a good deal! The quick and easy way to file bankruptcy. But wait................there's more! Pete "BDK" wrote in message ... In article , says... I already checked that website.............it appears they only take PayPal, so that option is out. I get so many fraudelant e-mails from PayPal informing me about suspicious activity on my account. I don't have a PayPal account, so I will let it rest there. The only other source is A.G. Tannenbaum, but they don't seem to answer their phones. Any other sources? Also, I did see those screws for the front panel, but I need to remove the whole assembly so I can work on the synthesizer. It seems that the LO output from the VFO droops at the high end of the tuning range. When I tune up above "800" on the mechanical dial, the synthesizer goes out of lock. This is on all bands, when they kind of work. I believe that this synthesizer is a dual-loop hybrid vernier synthesizer. I just need to find out where the sampling point for the VFO is. I do have a long Phillips head screwdriver, so I will pull it apart today. Hopefully, the top of the unit separates from the bottom; that is all I need to pull off. Thanks for the info! Pete "Unrevealed Source" wrote in message ... 1) You're on the wrong track taking the bottom screws out. Put them back in. 2) There are six screws holding the front panel on. You'll need a long Philips screwdriver, 8" or more shaft, preferably with magnetic tip to pull the screws out. Without the service manual, you might be able to figure out which ones they are (two are inside the battery compartment lid, but the others are harder to get to.) 3) Buy the service manual for $19.95 at www.manualzone.com/. If you own this radio, you should have one. This is a very service-hostile radio. If you do go through the trouble to take the front panel off, use that time to replace all of the bulbs. "Pete KE9OA" wrote in message ... How do I dissamble this unit? I was able to remove the back panel, and I have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete LOL, you think Paypal is sending those emails? BDK |
I figured out the problem with the radio. I needed to clean the 1MHz tuning
ranges. The interesting thing is that these ranges are not controlled by a switch, but by an indexing mechanism that tunes a miniature multi-gang tuning capacitor in what appears to be a form of the Wadley Loop system that the Yaesu FRG-100 uses. This is a form of a hybrid synthesizer that uses a 1MHz comb generator as the reference. When you are changing the 1MHz tuning steps, you are essentially tuning a free-running oscillator. When you tune this oscillator to within the capture range of the PLL, this oscillator locks on to one of the harmonics of the 1MHz comb generator. I still need to figure out why the system goes out of lock at the extreme upper end of the VFO tuning range, but I think that the amplitude of the VFO is starting to droop at this end. I think that the RF output trimmer and padder need to peaked while watching the output on an RF Voltmeter. A piece of cake....................I just don't know how big of a piece of cake it will be! Pete "Pete KE9OA" wrote in message ... It looks like I will need a service manual for this radio. I cleaned the switches and it does work better, but the PLL is still in need of adjustment. On the ranges below 5MHz, the system goes out of lock most of the time. Same thing when you tune above "900" on the tuning dial. I would surmise that there is probably a VCO coil that needs adjustment, and that right now, the system is set at the edge of its capture range. I'll let you folks know what the problem is once I finish with the repair. Oh, I found out the reason that I couldn't find that final screw...........the documentation indicated that this screw was at a point in the chassis that was 3 inches higher than it really was! Pete "Pete KE9OA" wrote in message ... Of course not! Especially when I see that somebody from Nigeria and somebody else from Bosnia is using my "supposed" account. I guess they gave up on sending those "Greetings, I am Doctor Blah Blah Blah" things that offer to let me launder their 5 million dollar inheritance, if I will only give them my bank account number, routing number, etc. It looks like I lost out on that one. I better move much faster next time I get one of those e-mails. What a good deal! The quick and easy way to file bankruptcy. But wait................there's more! Pete "BDK" wrote in message ... In article , says... I already checked that website.............it appears they only take PayPal, so that option is out. I get so many fraudelant e-mails from PayPal informing me about suspicious activity on my account. I don't have a PayPal account, so I will let it rest there. The only other source is A.G. Tannenbaum, but they don't seem to answer their phones. Any other sources? Also, I did see those screws for the front panel, but I need to remove the whole assembly so I can work on the synthesizer. It seems that the LO output from the VFO droops at the high end of the tuning range. When I tune up above "800" on the mechanical dial, the synthesizer goes out of lock. This is on all bands, when they kind of work. I believe that this synthesizer is a dual-loop hybrid vernier synthesizer. I just need to find out where the sampling point for the VFO is. I do have a long Phillips head screwdriver, so I will pull it apart today. Hopefully, the top of the unit separates from the bottom; that is all I need to pull off. Thanks for the info! Pete "Unrevealed Source" wrote in message ... 1) You're on the wrong track taking the bottom screws out. Put them back in. 2) There are six screws holding the front panel on. You'll need a long Philips screwdriver, 8" or more shaft, preferably with magnetic tip to pull the screws out. Without the service manual, you might be able to figure out which ones they are (two are inside the battery compartment lid, but the others are harder to get to.) 3) Buy the service manual for $19.95 at www.manualzone.com/. If you own this radio, you should have one. This is a very service-hostile radio. If you do go through the trouble to take the front panel off, use that time to replace all of the bulbs. "Pete KE9OA" wrote in message ... How do I dissamble this unit? I was able to remove the back panel, and I have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete LOL, you think Paypal is sending those emails? BDK |
In article ,
says... Of course not! Especially when I see that somebody from Nigeria and somebody else from Bosnia is using my "supposed" account. I guess they gave up on sending those "Greetings, I am Doctor Blah Blah Blah" things that offer to let me launder their 5 million dollar inheritance, if I will only give them my bank account number, routing number, etc. It looks like I lost out on that one. I better move much faster next time I get one of those e-mails. What a good deal! The quick and easy way to file bankruptcy. But wait................there's more! Pete "BDK" wrote in message ... In article , says... I already checked that website.............it appears they only take PayPal, so that option is out. I get so many fraudelant e-mails from PayPal informing me about suspicious activity on my account. I don't have a PayPal account, so I will let it rest there. The only other source is A.G. Tannenbaum, but they don't seem to answer their phones. Any other sources? Also, I did see those screws for the front panel, but I need to remove the whole assembly so I can work on the synthesizer. It seems that the LO output from the VFO droops at the high end of the tuning range. When I tune up above "800" on the mechanical dial, the synthesizer goes out of lock. This is on all bands, when they kind of work. I believe that this synthesizer is a dual-loop hybrid vernier synthesizer. I just need to find out where the sampling point for the VFO is. I do have a long Phillips head screwdriver, so I will pull it apart today. Hopefully, the top of the unit separates from the bottom; that is all I need to pull off. Thanks for the info! Pete "Unrevealed Source" wrote in message ... 1) You're on the wrong track taking the bottom screws out. Put them back in. 2) There are six screws holding the front panel on. You'll need a long Philips screwdriver, 8" or more shaft, preferably with magnetic tip to pull the screws out. Without the service manual, you might be able to figure out which ones they are (two are inside the battery compartment lid, but the others are harder to get to.) 3) Buy the service manual for $19.95 at www.manualzone.com/. If you own this radio, you should have one. This is a very service-hostile radio. If you do go through the trouble to take the front panel off, use that time to replace all of the bulbs. "Pete KE9OA" wrote in message ... How do I dissamble this unit? I was able to remove the back panel, and I have removed the screws from the bottom of the unit. What I need to do is clean the frequency range switches. The PLL has some unlock problems, and the only way I can get at them is to take the unit out of the case. Also, does anybody on this group have any kind of service info that they can scan and e-mail to me? I would be glad to pay for the effort. Pete LOL, you think Paypal is sending those emails? BDK Good! I do tech support and there ARE people who think these things are legit messages! We had a woman try to open and then send a complaint to a virus laden message from.."Tech support" every time a new copy came even after I TOLD HER it was a virus, and to delete it, on two previous calls! The first and second viruses were detected by Norton or whatever and she was ok, but the last one nailed her PC and totally trashed it. She calls again, all shakey, and I ask her why she tried to open it, after I had told her we would NEVER, EVER send an attachment without talking to her first, ever, period. I told her that an attachment flat out made the message bogus, period, twice before. Just delete it. Then she says, and I still can't believe she said this, "Oh GOD, I thought you just meant for that month it was a bogus message if it had an attachment!" Huh?? "No ma'am, ever, period, always.." This same woman replied to one of the bank messages asking for her account info. Sigh.. What does she do for a living?? College Professor, I verified it! No wonder so many of my friend's kids are so scary dumb.. BDK |
It is pretty uncanny how some folks can get tricked pretty easily. Whenever
I get those e-mails, I just use the "block sender" function and get rid of them. If I get a string of those e-mails, I go to my provider's website and report them as spam. I do use Internet Explorer, but I disable active scripting, install on demand, etc. If I do need to go to a website that uses Javascripting, I use Mozilla Firefox 0.8. I did try the newest version of Firefox, but I preferred the earlier version. Now, about the radio....................I've got the PLL locking on all ranges as long as I keep the VFO tuned below its highest frequency. Too bad A.G. Tannebaum is closed on Fridays; otherwise, I would have ordered the service manual. I don't think it will be more than another hour's work to get the radio up and running. An interesting thing about this radio...it uses a low priced Murata CFU-455J (4-element) filter for the narrow bandwidth, while the wide bandwidth seems to be a Toko transformer that has the ceramic filter integrated into the structure. If the radio wasn't such a difficult unit to work on, I would replace that filter with an 11-element unit such as a CFR455. The radio is definite in the "just above toy" class, but it is a very nice toy! It will be a keeper. Pete Good! I do tech support and there ARE people who think these things are legit messages! We had a woman try to open and then send a complaint to a virus laden message from.."Tech support" every time a new copy came even after I TOLD HER it was a virus, and to delete it, on two previous calls! The first and second viruses were detected by Norton or whatever and she was ok, but the last one nailed her PC and totally trashed it. She calls again, all shakey, and I ask her why she tried to open it, after I had told her we would NEVER, EVER send an attachment without talking to her first, ever, period. I told her that an attachment flat out made the message bogus, period, twice before. Just delete it. Then she says, and I still can't believe she said this, "Oh GOD, I thought you just meant for that month it was a bogus message if it had an attachment!" Huh?? "No ma'am, ever, period, always.." This same woman replied to one of the bank messages asking for her account info. Sigh.. What does she do for a living?? College Professor, I verified it! No wonder so many of my friend's kids are so scary dumb.. BDK |
All of them wimmins are gullible to computer spam and computers
viruses.You would think they have at least half a brain.But there is nothing between their ears but peckers. cuhulin |
|
sounds like you have the white version, it is not as good as the orange
version starting with serial number 30,000 it is one of the most sensitive portables you will ever see. I did a run off last year (or two ago) and published the results here and they were amazing. the sony had a clear signal when other famous receivers had mud ! "Pete KE9OA" wrote in message ... It is pretty uncanny how some folks can get tricked pretty easily. Whenever I get those e-mails, I just use the "block sender" function and get rid of them. If I get a string of those e-mails, I go to my provider's website and report them as spam. I do use Internet Explorer, but I disable active scripting, install on demand, etc. If I do need to go to a website that uses Javascripting, I use Mozilla Firefox 0.8. I did try the newest version of Firefox, but I preferred the earlier version. Now, about the radio....................I've got the PLL locking on all ranges as long as I keep the VFO tuned below its highest frequency. Too bad A.G. Tannebaum is closed on Fridays; otherwise, I would have ordered the service manual. I don't think it will be more than another hour's work to get the radio up and running. An interesting thing about this radio...it uses a low priced Murata CFU-455J (4-element) filter for the narrow bandwidth, while the wide bandwidth seems to be a Toko transformer that has the ceramic filter integrated into the structure. If the radio wasn't such a difficult unit to work on, I would replace that filter with an 11-element unit such as a CFR455. The radio is definite in the "just above toy" class, but it is a very nice toy! It will be a keeper. Pete Good! I do tech support and there ARE people who think these things are legit messages! We had a woman try to open and then send a complaint to a virus laden message from.."Tech support" every time a new copy came even after I TOLD HER it was a virus, and to delete it, on two previous calls! The first and second viruses were detected by Norton or whatever and she was ok, but the last one nailed her PC and totally trashed it. She calls again, all shakey, and I ask her why she tried to open it, after I had told her we would NEVER, EVER send an attachment without talking to her first, ever, period. I told her that an attachment flat out made the message bogus, period, twice before. Just delete it. Then she says, and I still can't believe she said this, "Oh GOD, I thought you just meant for that month it was a bogus message if it had an attachment!" Huh?? "No ma'am, ever, period, always.." This same woman replied to one of the bank messages asking for her account info. Sigh.. What does she do for a living?? College Professor, I verified it! No wonder so many of my friend's kids are so scary dumb.. BDK |
I should point out all were used as portables on whip and battery power
"mike maghakian" wrote in message ... sounds like you have the white version, it is not as good as the orange version starting with serial number 30,000 it is one of the most sensitive portables you will ever see. I did a run off last year (or two ago) and published the results here and they were amazing. the sony had a clear signal when other famous receivers had mud ! "Pete KE9OA" wrote in message ... It is pretty uncanny how some folks can get tricked pretty easily. Whenever I get those e-mails, I just use the "block sender" function and get rid of them. If I get a string of those e-mails, I go to my provider's website and report them as spam. I do use Internet Explorer, but I disable active scripting, install on demand, etc. If I do need to go to a website that uses Javascripting, I use Mozilla Firefox 0.8. I did try the newest version of Firefox, but I preferred the earlier version. Now, about the radio....................I've got the PLL locking on all ranges as long as I keep the VFO tuned below its highest frequency. Too bad A.G. Tannebaum is closed on Fridays; otherwise, I would have ordered the service manual. I don't think it will be more than another hour's work to get the radio up and running. An interesting thing about this radio...it uses a low priced Murata CFU-455J (4-element) filter for the narrow bandwidth, while the wide bandwidth seems to be a Toko transformer that has the ceramic filter integrated into the structure. If the radio wasn't such a difficult unit to work on, I would replace that filter with an 11-element unit such as a CFR455. The radio is definite in the "just above toy" class, but it is a very nice toy! It will be a keeper. Pete Good! I do tech support and there ARE people who think these things are legit messages! We had a woman try to open and then send a complaint to a virus laden message from.."Tech support" every time a new copy came even after I TOLD HER it was a virus, and to delete it, on two previous calls! The first and second viruses were detected by Norton or whatever and she was ok, but the last one nailed her PC and totally trashed it. She calls again, all shakey, and I ask her why she tried to open it, after I had told her we would NEVER, EVER send an attachment without talking to her first, ever, period. I told her that an attachment flat out made the message bogus, period, twice before. Just delete it. Then she says, and I still can't believe she said this, "Oh GOD, I thought you just meant for that month it was a bogus message if it had an attachment!" Huh?? "No ma'am, ever, period, always.." This same woman replied to one of the bank messages asking for her account info. Sigh.. What does she do for a living?? College Professor, I verified it! No wonder so many of my friend's kids are so scary dumb.. BDK |
I do have the white version...........I also have a couple of filters that I
can throw in, but I will keep it original. You never know who will want it in the future. It will be nice, once I get that final wrinkle worked out of it. Pete "mike maghakian" wrote in message ... sounds like you have the white version, it is not as good as the orange version starting with serial number 30,000 it is one of the most sensitive portables you will ever see. I did a run off last year (or two ago) and published the results here and they were amazing. the sony had a clear signal when other famous receivers had mud ! "Pete KE9OA" wrote in message ... It is pretty uncanny how some folks can get tricked pretty easily. Whenever I get those e-mails, I just use the "block sender" function and get rid of them. If I get a string of those e-mails, I go to my provider's website and report them as spam. I do use Internet Explorer, but I disable active scripting, install on demand, etc. If I do need to go to a website that uses Javascripting, I use Mozilla Firefox 0.8. I did try the newest version of Firefox, but I preferred the earlier version. Now, about the radio....................I've got the PLL locking on all ranges as long as I keep the VFO tuned below its highest frequency. Too bad A.G. Tannebaum is closed on Fridays; otherwise, I would have ordered the service manual. I don't think it will be more than another hour's work to get the radio up and running. An interesting thing about this radio...it uses a low priced Murata CFU-455J (4-element) filter for the narrow bandwidth, while the wide bandwidth seems to be a Toko transformer that has the ceramic filter integrated into the structure. If the radio wasn't such a difficult unit to work on, I would replace that filter with an 11-element unit such as a CFR455. The radio is definite in the "just above toy" class, but it is a very nice toy! It will be a keeper. Pete Good! I do tech support and there ARE people who think these things are legit messages! We had a woman try to open and then send a complaint to a virus laden message from.."Tech support" every time a new copy came even after I TOLD HER it was a virus, and to delete it, on two previous calls! The first and second viruses were detected by Norton or whatever and she was ok, but the last one nailed her PC and totally trashed it. She calls again, all shakey, and I ask her why she tried to open it, after I had told her we would NEVER, EVER send an attachment without talking to her first, ever, period. I told her that an attachment flat out made the message bogus, period, twice before. Just delete it. Then she says, and I still can't believe she said this, "Oh GOD, I thought you just meant for that month it was a bogus message if it had an attachment!" Huh?? "No ma'am, ever, period, always.." This same woman replied to one of the bank messages asking for her account info. Sigh.. What does she do for a living?? College Professor, I verified it! No wonder so many of my friend's kids are so scary dumb.. BDK |
I received the service manual. Now, on to the repair.............
Pete "BDK" wrote in message ... In article , says... All of them wimmins are gullible to computer spam and computers viruses.You would think they have at least half a brain.But there is nothing between their ears but peckers. cuhulin Nah, just as many guys fall for it, she's just the only one I know of that fell for the messages and the credit card stuff. BDK |
I found the problem with the radio. TC8, the trimmer capacitor for the low
end VCO range was cracked and wouldn't tune. I looked at the parts list and all that was given was a Sony part number.......no value in pF. What a useless manual! At least it was only 25 dollars. If I knew what value this cap was supposed to be, I would throw in a microwave trimmer cap.....that is, if I could get all of that plastic for the bandswitching mechanism out of the way. Pete "Pete KE9OA" wrote in message ... I received the service manual. Now, on to the repair............. Pete "BDK" wrote in message ... In article , says... All of them wimmins are gullible to computer spam and computers viruses.You would think they have at least half a brain.But there is nothing between their ears but peckers. cuhulin Nah, just as many guys fall for it, she's just the only one I know of that fell for the messages and the credit card stuff. BDK |
Are you sure?
Pse check the amplitude on both inputs of the PLL circuit. In both cases when locked and when lock is lost. About 50% of the 2SC930 in this radio will have 50% reduced hFE. |
Thank you.......I appreciate the info. It is interesting that semiconductors
would degrade in that manner, unless they were being run near their design limits. If this is the case, the parameters were not derated properly. I ran into the same thing with the Lowe receivers. They are using a 4569 to divide the uP clock down to the BFO injection frequencies. Every so often, these chips fail when brought up to operating temperature. Aside from the dense plated through holes, these radios aren't nearly as bad to service as that 6800 is. Anyway, it did turn out that the trimmer was indeed cracked. I have repaired the unit and it is going back to the owner. It was the most incredible nightmare to repair, but I was able to fix it. The fellow that I made the deal with is giving me a Grundig 3400 as a consolation prize. That radio is a little bit bigger than what I would normally use, but it is good trading material. Pete "C.R. Kuijer" wrote in message ... Are you sure? Pse check the amplitude on both inputs of the PLL circuit. In both cases when locked and when lock is lost. About 50% of the 2SC930 in this radio will have 50% reduced hFE. |
Pete KE9OA wrote:
I found the problem with the radio. TC8, the trimmer capacitor for the low end VCO range was cracked and wouldn't tune. I've seen that before.. cracked coils and trimmers are the signs of a twirler,someone with tools but little skills with regard to rf alignment. was the trimmer accessable before dismantling? I looked at the parts list and all that was given was a Sony part number.......no value in pF. What a useless manual! At least it was only 25 dollars. If I knew what value this cap was supposed to be, I would throw in a microwave trimmer cap.....that is, if I could get all of that plastic for the bandswitching mechanism out of the way. Pete "Pete KE9OA" wrote in message ... I received the service manual. Now, on to the repair............. Pete "BDK" wrote in message ... In article , says... All of them wimmins are gullible to computer spam and computers viruses.You would think they have at least half a brain.But there is nothing between their ears but peckers. cuhulin Nah, just as many guys fall for it, she's just the only one I know of that fell for the messages and the credit card stuff. BDK |
I've seen that before.. cracked coils and trimmers are the signs of a twirler,someone with tools but little skills with regard to rf alignment. was the trimmer accessable before dismantling? The trimmer is only accessable once you remove the chassis from the cabinet. It wasn't a matter of somebody destroying it..it didn't need any help. It just fell apart over the years. I did replace the trimmer, and the alignment notes stated that an external frequency counter could be used if the radio's digital display was defective. Of course, the internal display wasn't defective, but Sony's alignment notes are utterly useless. They tell you to disable the high frequency PLL.......once you do this, the system goes out of lock and the internal display shows what appears to be the preset frequency. Ok..............I decided to use an external frequency counter. The only problem here is that the useless service manual doesn't show where to hook up the counter. The radio went back to its owner, and a Grundig 3400 was traded to me instead. I am working on the Grundig unit now. I just got through cleaning the I.F. bandwidth switch and adjusting the indexing mechanism for the SW bands. One thing I can say after comparing the innards to my Grundig TR-6001.....the mechanical construction of the indexing mechanism on the TR-6001 is much better than the 3400. Instead of using these leaves sticking out from each of the band range modules the way it is done on the 3400, the 6001 has either gold plated or brass rivets that make contact with the leaf springs instead. A much more reliable radio.......I think that the 6000 series was the best of their whole model line, although the 3400 was still made in Germany, it still used ERO polypropolene audio capacitors, and it still used a Variometer that was mechanically coupled to the main 2-gang tuning capacitor to add that extra 3rd gand, so it wasn't completely without its good points. Once I finish it up, I will play with it for awhile, and then trade it off. Pete |
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