I posted this at AudioKarma, scroll down to the bottom to see the picture. If the link doesn't work, let me know and I'll see about uploading it somewhere else.
http://www.audiokarma.org/forums/showthread.php?p=1962227#post1962227
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:I posted this at AudioKarma, scroll down to the bottom to see the picture. If the link doesn't work, let me know and I'll see about uploading it somewhere else.
:
:http://www.audiokarma.org/forums/showthread.php?p=1962227#post1962227
Tried to look at your picture, but couldn't get ot.
Best Regards,
Bill
Others have told me that it looks like the remnants of a paper capacitor, but the only one I can find on the schematic that could be it, is only 6pf. It is cylinder shaped, and looks like it is made of metal. One end is blown out and there is a trail of dark colored goo on the chassis bottom plate, but no evidence of paper. I think it is part 56 on the schematic and layout diagram.
::Can someone identify what component this is? It doesn't look burned, and the inner part slides around in the outer sleeve. This is on the back section of the band selector switch. One side goes to ground and the other side goes to the switch.
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::I posted this at AudioKarma, scroll down to the bottom to see the picture. If the link doesn't work, let me know and I'll see about uploading it somewhere else.
::
::http://www.audiokarma.org/forums/showthread.php?p=1962227#post1962227
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:Tried to look at your picture, but couldn't get ot.
:
:Best Regards,
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:Bill
![](http://i322.photobucket.com/albums/nn428/Maxxarcade/mysterycomponent.jpg")
I think this is a 6pf cap, part number 56 on the schematic, but I don't know what type of cap it was. It's not shaped like a mica cap.
:Ok, I'll try Photobucket later today and see if I can post the pics here.
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:Others have told me that it looks like the remnants of a paper capacitor, but the only one I can find on the schematic that could be it, is only 6pf. It is cylinder shaped, and looks like it is made of metal. One end is blown out and there is a trail of dark colored goo on the chassis bottom plate, but no evidence of paper. I think it is part 56 on the schematic and layout diagram.
:
:::Can someone identify what component this is? It doesn't look burned, and the inner part slides around in the outer sleeve. This is on the back section of the band selector switch. One side goes to ground and the other side goes to the switch.
:::
:::I posted this at AudioKarma, scroll down to the bottom to see the picture. If the link doesn't work, let me know and I'll see about uploading it somewhere else.
:::
:::http://www.audiokarma.org/forums/showthread.php?p=1962227#post1962227
::
::Tried to look at your picture, but couldn't get ot.
::
::Best Regards,
::
::Bill
:Let's see if this works:
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:I think this is a 6pf cap, part number 56 on the schematic, but I don't know what type of cap it was. It's not shaped like a mica cap.
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::Ok, I'll try Photobucket later today and see if I can post the pics here.
::
::Others have told me that it looks like the remnants of a paper capacitor, but the only one I can find on the schematic that could be it, is only 6pf. It is cylinder shaped, and looks like it is made of metal. One end is blown out and there is a trail of dark colored goo on the chassis bottom plate, but no evidence of paper. I think it is part 56 on the schematic and layout diagram.
::
::::Can someone identify what component this is? It doesn't look burned, and the inner part slides around in the outer sleeve. This is on the back section of the band selector switch. One side goes to ground and the other side goes to the switch.
::::
::::I posted this at AudioKarma, scroll down to the bottom to see the picture. If the link doesn't work, let me know and I'll see about uploading it somewhere else.
::::
::::http://www.audiokarma.org/forums/showthread.php?p=1962227#post1962227
:::
:::Tried to look at your picture, but couldn't get ot.
:::
:::Best Regards,
:::
:::Bill
:
Hi Aaron,
You got the picture that time.
It looks like a capacitor or inductor with a shield. I expect that the compnent, capacitor or inductor has the B+ on it and shorted against the shield case causing this failure. It is a common failure with old insulation.
I have looked over the schematic which is a bit muddy, and component 50 looks like a possibility, but that is more guess than anything else. I don't see any inductors on the schematic, so the inductor theory seems unlikely.
I recommend that you identify the component by where it is connected. It appears to have its main two leads going to the band switch, with that shield going to ground. The ground shield may not be shown on the schematic. It could have been a last minute addition by an engineer after production started and the change never made it to the published schematic.
By the way I only found partial schematic on this site. The schematic I looked at was on the Schematic bank: http://techpreservation.dyndns.org/schematics/41/41_Magnavox_CR154_66.djvu
As mentioned before it was muddy, but complete.
This looks like a console with record player. Should be impressive when you have it going.
Best Regards,
Bill Grimm
I looked at it again, and it seems that a wire I thought was connected to the mystery component is not connected. This makes two wire connections and a low value capacitor, which concurrs with your suspicions.
Again it is a failure caused by insulation break down.
Best Regards,
Bill Grimm
Doug
:Hi Arron,
: I looked at it again, and it seems that a wire I thought was connected to the mystery component is not connected. This makes two wire connections and a low value capacitor, which concurrs with your suspicions.
: Again it is a failure caused by insulation break down.
:
:Best Regards,
:
:Bill Grimm
O.K. ....I took your photo and digitally enhanced it up to the point where no further improvement was possible due to the pixel density and then I zoomed it on up a bit. Your capacitor reminds me of a very old generation style electrolytic capacitor that had an end seal, and out of the center of that seal, came a hollow metal stud and then there was a terminal lug crimped almost completely around that stud (see the 3 green dots)with the top portion of the terminal bent out 90 degrees with a conventional treatment, such as one finds on a common terminal lug strip. Such as you see on the portion with the center single green dot, and then there seems to be a wire link connecting to the wafer switch contact , where you see the 2 green dots. Now look at the lug of the osc coil that has the 3 black zebra dotted bare wires, there is one that goes right over to the chassis mounted ground lug and then an additional like marked wire goes across the front and connects onto a sole lug of the band switch. Digitally Enhanced Photos: Schematic for CR154:
So...overall what I think that I seem to see here, is an electrolytic, decidedly overloaded such that it has vaporized its electrolyte with the internal pressure popping out the end seal. The electrolyte balance that blew out or dripped down should have discolored the chassis.
That then leaves us two more wires branching out from that osc coil terminal one of which is marked doing up to the shell of the UFO, and now is the hard to confirm portion….. where that 3 rd black zebra wire goes up and disappears behind the cap shell with just a trace showing where I have placed the black dot above the "lava" and then you see it appearing below the crimped terminal with one black dot marking it and then I have 2 more dots with 2 white ones for enhancement until you can then see it connecting to the top wire junction where the caps are paralleled.
The other wire in question is the yellow dot marked one where it just seems to pass along from its sole connection to a terminal on the osc coil and then route over to one and then another terminal on the band switch, with it never being connected to NOR touching anything in that routing, along with that previous wire that we were just examining.
It’s the first of the month , so it seems like the last months data has not spooled up yet, so one does not have access to in for a bit longer, therefore you could not go back to view the unitized schematic that I had furnished earlier , so I will place it below also.
Consult it and find that I have additionally placed two green rectangles above two electrolytics that are utilized for AF tubes cathode bypass functions….why don’t you physically track them down (considering that you have not replaced them already) and see what configuration of casing that those original capacitors used, and if they look like this mystery one that you have found over in the RF portion.
Answer my 5 or so queries in the text and on the pics, and maybe more pieces of the puzzle can be solved.
73's de Edd
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### Added Green box referencing to electrolytics on schema ###
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:O.K. ....I took your photo and digitally enhanced it up to the point where no further improvement was possible due to the pixel density and then I zoomed it on up a bit.
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:Your capacitor reminds me of a very old generation style electrolytic capacitor that had an end seal, and out of the center of that seal, came a hollow metal stud and then there was a terminal lug crimped almost completely around that stud (see the 3 green dots)with the top portion of the terminal bent out 90 degrees with a conventional treatment, such as one finds on a common terminal lug strip. Such as you see on the portion with the center single green dot, and then there seems to be a wire link connecting to the wafer switch contact , where you see the 2 green dots.
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:So...overall what I think that I seem to see here, is an electrolytic, decidedly overloaded such that it has vaporized its electrolyte with the internal pressure popping out the end seal. The electrolyte balance that blew out or dripped down should have discolored the chassis.
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:
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:Now look at the lug of the osc coil that has the 3 black zebra dotted bare wires, there is one that goes right over to the chassis mounted ground lug and then an additional like marked wire goes across the front and connects onto a sole lug of the band switch.
:
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:That then leaves us two more wires branching out from that osc coil terminal one of which is marked doing up to the shell of the UFO, and now is the hard to confirm portion….. where that 3 rd black zebra wire goes up and disappears behind the cap shell with just a trace showing where I have placed the black dot above the "lava" and then you see it appearing below the crimped terminal with one black dot marking it and then I have 2 more dots with 2 white ones for enhancement until you can then see it connecting to the top wire junction where the caps are paralleled.
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:The other wire in question is the yellow dot marked one where it just seems to pass along from its sole connection to a terminal on the osc coil and then route over to one and then another terminal on the band switch, with it never being connected to NOR touching anything in that routing, along with that previous wire that we were just examining.
:
:It’s the first of the month , so it seems like the last months data has not spooled up yet, so one does not have access to in for a bit longer, therefore you could not go back to view the unitized schematic that I had furnished earlier , so I will place it below also.
:
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:Consult it and find that I have additionally placed two green rectangles above two electrolytics that are utilized for AF tubes cathode bypass functions….why don’t you physically track them down (considering that you have not replaced them already) and see what configuration of casing that those original capacitors used, and if they look like this mystery one that you have found over in the RF portion.
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:Answer my 5 or so queries in the text and on the pics, and maybe more pieces of the puzzle can be solved.
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:Digitally Enhanced Photos:
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:Schematic for CR154:
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:73's de Edd
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The pictures are great Edd. You always seem to come through.
My bets are that it is the capacitor labeled as 46. It seems to be the only component that goes between the band switch and RF or OSC coil. Regrettable its value is illedgable on the schematic.
Best Regards,
Bill Grimm
Sir William G.:
I am seeing that “mystery cylinder” with the popped off end as having only two wiring connections to it.
Look at its left side and there should be a bare tinned Cu lead that is pressure spot welded to the bottom center of its case (all obscured from being viewed) and then it routes down to the oscillator coil to a bottom center terminal, where it is sharing that junction with two other bare wires, the most significant of the two is the one going over to the left and making its terminus to the chassis ground lug terminal..thus the whole wiring buss being tied into this is ground. Therefore, I think that this was the significant positioning of this component to get its grounding, with its top connector terminal making connection to a sole terminal of a band switch stator terminal, with it not even particularly being tied into the osc ckt....but to B+ if the unit was an electrolytic.
On the mentioned item 46, I read it as being an .004 plus or minus 5 % ufd as a block capacitor…assuredly Silver Mica…. and neither of its ends are wired directly to ground.
Sooooooooo…Meester Aaron, considering that the unit is now operative and the last that I heard…it was… hows about DC metering that terminal on the switch that the hot end of the mystery component is connected to and see what voltage level is present there…and be sure to run that switch thru all of its positions, as it might be dormant of voltage in one / some positions.
73's de Edd