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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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Mazda 626, Fujitsu tuner
I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my
1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#2
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On Tue, 7 Sep 2004 12:41:42 -0500, "Wayne Tiffany"
put finger to keyboard and composed: I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. snip Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. In the past I have managed to obtain parts and schematics for Toyota/Fujitsu Ten gear from Fujitsu Ten (Australia). In North America you could try the following: Fujitsu Ten Corp. of America Address: 19600 South Vermont Avenue Torrance, CA 90502 U.S.A. Contact: Tel: +1-310-327-2151 Fax: +1-310-767-4355 Business activities: Manufacture, sales and service of car audio products and car electronic devices. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
#3
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Thanks - I'll call today.
WT "Franc Zabkar" wrote in message ... On Tue, 7 Sep 2004 12:41:42 -0500, "Wayne Tiffany" put finger to keyboard and composed: I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. snip Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. In the past I have managed to obtain parts and schematics for Toyota/Fujitsu Ten gear from Fujitsu Ten (Australia). In North America you could try the following: Fujitsu Ten Corp. of America Address: 19600 South Vermont Avenue Torrance, CA 90502 U.S.A. Contact: Tel: +1-310-327-2151 Fax: +1-310-767-4355 Business activities: Manufacture, sales and service of car audio products and car electronic devices. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
#4
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Vibration damage to car stereo boards is common. Look for
components/boards that are mounted at right angles to the main board and soldered to it. Vibration usually will damage the solder connections here over time. Resolder the input plug connectors, 90° boards and tall components, like caps and tuner section, where vibration is magnified. JR Wayne Tiffany wrote: I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#5
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Thanks for the thoughts - I'll check it out this weekend. Any more out
there? WT "JR NORTH" wrote in message ... Vibration damage to car stereo boards is common. Look for components/boards that are mounted at right angles to the main board and soldered to it. Vibration usually will damage the solder connections here over time. Resolder the input plug connectors, 90° boards and tall components, like caps and tuner section, where vibration is magnified. JR Wayne Tiffany wrote: I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#6
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A bit of further observation. I have had the radio installed since the time
of this post and after paying attention to it, I find that it works ok if the temperature is below about 75° F, and also above about 40° F. I've seen devices become sensitive to being too hot, but never one that would also quit at a low temperature. Any more thoughts? Just another note - I have gone over the boards under a microscope and found no solder problems. WT "Wayne Tiffany" wrote in message ... I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#7
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"Wayne Tiffany" bravely wrote to "All" (29 Nov 04 08:11:24)
--- on the heady topic of " Mazda 626, Fujitsu tuner" Definitely bad solder joints... WT From: "Wayne Tiffany" WT A bit of further observation. I have had the radio installed since WT the time of this post and after paying attention to it, I find that it WT works ok if the temperature is below about 750 F, and also above about WT 400 F. I've seen devices become sensitive to being too hot, but never WT one that would also quit at a low temperature. Any more thoughts? WT Just another note - I have gone over the boards under a microscope and WT found no solder problems. WT WT WT "Wayne Tiffany" wrote in message WT ... I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would WT occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to WT others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle WT wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#8
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Here's another interesting update. I haven't had the time recently to pull
it back out, so I am in the observation mode. :-) This morning it was about 25°F and of course, the radio would not work properly. However, I did listen to local TV channel 5 for a while! It lasted until the interior of the car warmed up a bit, then back to static, then to some radio station that I never did identify. All this without any response from the buttons or display. So, since channel 5 frequency is below the bottom end of the FM band, it would appear that I have something that is drifting to the low side. Interesting. WT "Wayne Tiffany" wrote in message ... A bit of further observation. I have had the radio installed since the time of this post and after paying attention to it, I find that it works ok if the temperature is below about 75° F, and also above about 40° F. I've seen devices become sensitive to being too hot, but never one that would also quit at a low temperature. Any more thoughts? Just another note - I have gone over the boards under a microscope and found no solder problems. WT "Wayne Tiffany" wrote in message ... I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#9
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You might want to check the voltage along the trace instead of a visual
inspection. I had a similar problem with the stereo in my '82 Supra (I think it was a Fujitsu). I ended up running a jumper from the connector where the +12VDC standby came on the board to an IC on the far side of the board. Followed the trace to get there, but there did not appear to broken anywhere. Good luck!! Don "Wayne Tiffany" wrote in message ... Here's another interesting update. I haven't had the time recently to pull it back out, so I am in the observation mode. :-) This morning it was about 25°F and of course, the radio would not work properly. However, I did listen to local TV channel 5 for a while! It lasted until the interior of the car warmed up a bit, then back to static, then to some radio station that I never did identify. All this without any response from the buttons or display. So, since channel 5 frequency is below the bottom end of the FM band, it would appear that I have something that is drifting to the low side. Interesting. WT "Wayne Tiffany" wrote in message ... A bit of further observation. I have had the radio installed since the time of this post and after paying attention to it, I find that it works ok if the temperature is below about 75° F, and also above about 40° F. I've seen devices become sensitive to being too hot, but never one that would also quit at a low temperature. Any more thoughts? Just another note - I have gone over the boards under a microscope and found no solder problems. WT "Wayne Tiffany" wrote in message ... I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#10
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Were you having these kinds of temperature issues? You're also suggesting
that there is a micro sized crack not visible that's causing the issue? Hmmm, could be - I'll try that next time I pull it out. Thanks. WT "Don" wrote in message ink.net... You might want to check the voltage along the trace instead of a visual inspection. I had a similar problem with the stereo in my '82 Supra (I think it was a Fujitsu). I ended up running a jumper from the connector where the +12VDC standby came on the board to an IC on the far side of the board. Followed the trace to get there, but there did not appear to broken anywhere. Good luck!! Don "Wayne Tiffany" wrote in message ... Here's another interesting update. I haven't had the time recently to pull it back out, so I am in the observation mode. :-) This morning it was about 25°F and of course, the radio would not work properly. However, I did listen to local TV channel 5 for a while! It lasted until the interior of the car warmed up a bit, then back to static, then to some radio station that I never did identify. All this without any response from the buttons or display. So, since channel 5 frequency is below the bottom end of the FM band, it would appear that I have something that is drifting to the low side. Interesting. WT "Wayne Tiffany" wrote in message ... A bit of further observation. I have had the radio installed since the time of this post and after paying attention to it, I find that it works ok if the temperature is below about 75° F, and also above about 40° F. I've seen devices become sensitive to being too hot, but never one that would also quit at a low temperature. Any more thoughts? Just another note - I have gone over the boards under a microscope and found no solder problems. WT "Wayne Tiffany" wrote in message ... I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
#11
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Wayne,
If I recall correctly, the problem was actually occurring in the summer. The radio would loose all it's presets during the day when the car sat out in the sun. I would reset everything on my way home from work and I seem to remember it holding most of the time until the next day. Obviously, it was cooler in the evening and the car was garaged once I got home. Certainly sounds like you are having thermal problems. Good luck with it! Don "Wayne Tiffany" wrote in message ... Were you having these kinds of temperature issues? You're also suggesting that there is a micro sized crack not visible that's causing the issue? Hmmm, could be - I'll try that next time I pull it out. Thanks. WT "Don" wrote in message ink.net... You might want to check the voltage along the trace instead of a visual inspection. I had a similar problem with the stereo in my '82 Supra (I think it was a Fujitsu). I ended up running a jumper from the connector where the +12VDC standby came on the board to an IC on the far side of the board. Followed the trace to get there, but there did not appear to broken anywhere. Good luck!! Don "Wayne Tiffany" wrote in message ... Here's another interesting update. I haven't had the time recently to pull it back out, so I am in the observation mode. :-) This morning it was about 25°F and of course, the radio would not work properly. However, I did listen to local TV channel 5 for a while! It lasted until the interior of the car warmed up a bit, then back to static, then to some radio station that I never did identify. All this without any response from the buttons or display. So, since channel 5 frequency is below the bottom end of the FM band, it would appear that I have something that is drifting to the low side. Interesting. WT "Wayne Tiffany" wrote in message ... A bit of further observation. I have had the radio installed since the time of this post and after paying attention to it, I find that it works ok if the temperature is below about 75° F, and also above about 40° F. I've seen devices become sensitive to being too hot, but never one that would also quit at a low temperature. Any more thoughts? Just another note - I have gone over the boards under a microscope and found no solder problems. WT "Wayne Tiffany" wrote in message ... I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my 1985 Mazda 626 and the tuner has developed a problem. It would occasionally lose its presets, as in clearing its memory. My first thought was that the constant +12 supply line was dropping, but I caught the tuner blanked out one time when I had the meter hooked up, and the supply was still there. So then I thought maybe it was a cracked solder joint, but a trip of all the boards under the microscope found none. I have checked the ESR of all the major caps and all appear to be ok. I may have missed something there as I just received & built my ESR meter over the weekend. But I compared caps of similar sizes, and also compared to others I had, and I didn't find any that raised alarm. The original symptoms started about a year ago, but were so random that I could never catch it being bad long enough to do any more than wiggle wires, etc. Now it finally totally quit, so whatever was deteriorating, finally quit. Has anyone been through one of these? Any guesses out there? Schematics available? Thanks for any help. WT |
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