How long can equipment go unused before powering up runs the risk of damage? Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern) Announcing the arrival of Valued Associate #679: Cesar Manara Unicorn Meta Zoo #1: Why another podcast?Can the noise of any switching PSU be attenuated if I put linear regulator before the output?What can cause this damage to the GPU?How long can a capacitor stay charged?Reduction of DC motor noiseHow do the NEC Article 460 requirements apply to small capacitors mounted outside of equipment?how the capacitor equation can be modified?Given specific equipment wattage, and the capacity of an industrial grade portable battery, how can I determine theoretical run time?How can removing a piezoelectric speaker/buzzer damage a circuit?Can parallel addition of a bigger capacitor damage the smaller one?Protecting a coin cell from high current spikes - using a capacitor or not?
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How long can equipment go unused before powering up runs the risk of damage?
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?Can the noise of any switching PSU be attenuated if I put linear regulator before the output?What can cause this damage to the GPU?How long can a capacitor stay charged?Reduction of DC motor noiseHow do the NEC Article 460 requirements apply to small capacitors mounted outside of equipment?how the capacitor equation can be modified?Given specific equipment wattage, and the capacity of an industrial grade portable battery, how can I determine theoretical run time?How can removing a piezoelectric speaker/buzzer damage a circuit?Can parallel addition of a bigger capacitor damage the smaller one?Protecting a coin cell from high current spikes - using a capacitor or not?
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$begingroup$
I have an older solid state radio transceiver I want to power up but I understand that electrolytic capacitors loose their function after a long time of non-use. There are articles about reforming electrolytics, but not much is said about how long electrolytics can be unpowered before precautions need to be take on powering up again.
The equipment is non-critical, no tubes, linear power supply. It is a TenTec Argosy II amateur radio transceiver. I can replace the caps if I need to. (And, yes, I am licensed to use the radio. KD4TTC)
power-supply capacitor damage
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
$endgroup$
|
show 2 more comments
$begingroup$
I have an older solid state radio transceiver I want to power up but I understand that electrolytic capacitors loose their function after a long time of non-use. There are articles about reforming electrolytics, but not much is said about how long electrolytics can be unpowered before precautions need to be take on powering up again.
The equipment is non-critical, no tubes, linear power supply. It is a TenTec Argosy II amateur radio transceiver. I can replace the caps if I need to. (And, yes, I am licensed to use the radio. KD4TTC)
power-supply capacitor damage
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
$endgroup$
3
$begingroup$
Electrolytics can also dry out...reforming can't do anything about that.
$endgroup$
– Toor
Apr 19 at 19:41
1
$begingroup$
You should probably seek input from other users of that model on an Amateur Radio forum. The question is not really on topic here, because it is about the usage/repair of a product for which you are not providing any design information.
$endgroup$
– Chris Stratton
Apr 19 at 20:46
1
$begingroup$
@ChrisStratton hm, maybe the question of "would the proposed procedure actually help, and does it potentially have any downsides for devices from the mid-80ies" would be more on-topic?
$endgroup$
– Marcus Müller
Apr 19 at 21:00
1
$begingroup$
@MarcusMüller - this kind of gear is designed to actually be maintained and has a technically aware user community. Consulting that expertise is much better than taking guesses from first principles.
$endgroup$
– Chris Stratton
Apr 19 at 21:22
1
$begingroup$
Let's just say that the whole idea of a post apocalyptic scavenger finding and getting modern electronics or vehicles operational is highly unlikely, unless they can produce new capacitors from scratch. Those are really the biggest failure point.
$endgroup$
– Passerby
2 days ago
|
show 2 more comments
$begingroup$
I have an older solid state radio transceiver I want to power up but I understand that electrolytic capacitors loose their function after a long time of non-use. There are articles about reforming electrolytics, but not much is said about how long electrolytics can be unpowered before precautions need to be take on powering up again.
The equipment is non-critical, no tubes, linear power supply. It is a TenTec Argosy II amateur radio transceiver. I can replace the caps if I need to. (And, yes, I am licensed to use the radio. KD4TTC)
power-supply capacitor damage
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
$endgroup$
I have an older solid state radio transceiver I want to power up but I understand that electrolytic capacitors loose their function after a long time of non-use. There are articles about reforming electrolytics, but not much is said about how long electrolytics can be unpowered before precautions need to be take on powering up again.
The equipment is non-critical, no tubes, linear power supply. It is a TenTec Argosy II amateur radio transceiver. I can replace the caps if I need to. (And, yes, I am licensed to use the radio. KD4TTC)
power-supply capacitor damage
power-supply capacitor damage
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
asked Apr 19 at 19:35
kd4ttckd4ttc
1285
1285
3
$begingroup$
Electrolytics can also dry out...reforming can't do anything about that.
$endgroup$
– Toor
Apr 19 at 19:41
1
$begingroup$
You should probably seek input from other users of that model on an Amateur Radio forum. The question is not really on topic here, because it is about the usage/repair of a product for which you are not providing any design information.
$endgroup$
– Chris Stratton
Apr 19 at 20:46
1
$begingroup$
@ChrisStratton hm, maybe the question of "would the proposed procedure actually help, and does it potentially have any downsides for devices from the mid-80ies" would be more on-topic?
$endgroup$
– Marcus Müller
Apr 19 at 21:00
1
$begingroup$
@MarcusMüller - this kind of gear is designed to actually be maintained and has a technically aware user community. Consulting that expertise is much better than taking guesses from first principles.
$endgroup$
– Chris Stratton
Apr 19 at 21:22
1
$begingroup$
Let's just say that the whole idea of a post apocalyptic scavenger finding and getting modern electronics or vehicles operational is highly unlikely, unless they can produce new capacitors from scratch. Those are really the biggest failure point.
$endgroup$
– Passerby
2 days ago
|
show 2 more comments
3
$begingroup$
Electrolytics can also dry out...reforming can't do anything about that.
$endgroup$
– Toor
Apr 19 at 19:41
1
$begingroup$
You should probably seek input from other users of that model on an Amateur Radio forum. The question is not really on topic here, because it is about the usage/repair of a product for which you are not providing any design information.
$endgroup$
– Chris Stratton
Apr 19 at 20:46
1
$begingroup$
@ChrisStratton hm, maybe the question of "would the proposed procedure actually help, and does it potentially have any downsides for devices from the mid-80ies" would be more on-topic?
$endgroup$
– Marcus Müller
Apr 19 at 21:00
1
$begingroup$
@MarcusMüller - this kind of gear is designed to actually be maintained and has a technically aware user community. Consulting that expertise is much better than taking guesses from first principles.
$endgroup$
– Chris Stratton
Apr 19 at 21:22
1
$begingroup$
Let's just say that the whole idea of a post apocalyptic scavenger finding and getting modern electronics or vehicles operational is highly unlikely, unless they can produce new capacitors from scratch. Those are really the biggest failure point.
$endgroup$
– Passerby
2 days ago
3
3
$begingroup$
Electrolytics can also dry out...reforming can't do anything about that.
$endgroup$
– Toor
Apr 19 at 19:41
$begingroup$
Electrolytics can also dry out...reforming can't do anything about that.
$endgroup$
– Toor
Apr 19 at 19:41
1
1
$begingroup$
You should probably seek input from other users of that model on an Amateur Radio forum. The question is not really on topic here, because it is about the usage/repair of a product for which you are not providing any design information.
$endgroup$
– Chris Stratton
Apr 19 at 20:46
$begingroup$
You should probably seek input from other users of that model on an Amateur Radio forum. The question is not really on topic here, because it is about the usage/repair of a product for which you are not providing any design information.
$endgroup$
– Chris Stratton
Apr 19 at 20:46
1
1
$begingroup$
@ChrisStratton hm, maybe the question of "would the proposed procedure actually help, and does it potentially have any downsides for devices from the mid-80ies" would be more on-topic?
$endgroup$
– Marcus Müller
Apr 19 at 21:00
$begingroup$
@ChrisStratton hm, maybe the question of "would the proposed procedure actually help, and does it potentially have any downsides for devices from the mid-80ies" would be more on-topic?
$endgroup$
– Marcus Müller
Apr 19 at 21:00
1
1
$begingroup$
@MarcusMüller - this kind of gear is designed to actually be maintained and has a technically aware user community. Consulting that expertise is much better than taking guesses from first principles.
$endgroup$
– Chris Stratton
Apr 19 at 21:22
$begingroup$
@MarcusMüller - this kind of gear is designed to actually be maintained and has a technically aware user community. Consulting that expertise is much better than taking guesses from first principles.
$endgroup$
– Chris Stratton
Apr 19 at 21:22
1
1
$begingroup$
Let's just say that the whole idea of a post apocalyptic scavenger finding and getting modern electronics or vehicles operational is highly unlikely, unless they can produce new capacitors from scratch. Those are really the biggest failure point.
$endgroup$
– Passerby
2 days ago
$begingroup$
Let's just say that the whole idea of a post apocalyptic scavenger finding and getting modern electronics or vehicles operational is highly unlikely, unless they can produce new capacitors from scratch. Those are really the biggest failure point.
$endgroup$
– Passerby
2 days ago
|
show 2 more comments
2 Answers
2
active
oldest
votes
$begingroup$
How long can equipment go unused before powering up runs the risk of damage?
Risk of damage is low, risk of poor operation from cap seal failure is high after 20 yrs, depending on many factors. ( See end)
This was an excellent transceiver. But it is so old that the service manual used MF for uF=μF and yet UH for uH=μH.
MF is these days means millifarads, not microfarads as in this unit service manual.
The 100W Tx will have need of good low ESR e-caps on supply for low ripple if they need replacing.
Do not operate Tx without a dummy load or antenna.
- Get the service manual below. or email to them for service related questions.
Get a DMM to measure Vdc and Vac ripple on large caps where the ripple voltage must be << 1% of Vdc to be considered good. ( Dissipation Factor, DF at 120Hz in datasheets.)
http://www.tentec.com/wp-content/uploads/2016/05/Argosy_II_Model_525_Manualf933.pdf
Unfortunately the service manual omitted the power supply board which is the main concern for worn out e-caps after 10 to 20 yrs with low C and high ESR values.
- so you **want to wing it* by looking for signs of slight end-bulge and measurements or hum on Rx or Tx.
- If everything looks OK, power it up. The only potential damage can be from pressing Tx without a load.
a portable RLC meter is often a good investment to verify caps out of the circuit.
anecdotal: When my Sanyo receiver was 15 yrs old and had spurious noise, I found one bad electrolytic or e-cap then replaced all of the similar size or bigger and discover a few more were also bad. so I ordered/replaced about a dozen of them. The cost of parts are cheap from Digikey and often less than the courier cost.
Cap conditioning.
At one-time Computer grade, 100k uF capacitors had high leakage currents which could be conditioned by a high series R to clear up the leakage currents. This, unfortunately, does nothing from failed caps that suffer from high Effective Series Resistance (ESR) and low Capacitance. As others have said. it won't help.
Like Batteries, also have wet electrolyte the age or MTBF is very much reputation of the brand used and it's high-temperature rating and the ratio of ripple current and voltage to the rated maximum.
E-caps are rated by hours of life at 85'C or 105'C or others since the accelerated life of 1500 hrs is all that caps can endure due to Arhennius Law. So not only is possible to generalize lifetime but suffice it to say, room temp seal quality, brand name and high temp rating, historical operating stress makes it impossible to predict. All I can say is even the best caps made in Japan will fail at some point, whether it is 5 yrs, 10 yrs or 50 yrs it is impossible to guess.
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
$endgroup$
2
$begingroup$
The trolls are back ( non-contributors = -2) and shall remain nameless.
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:10
$begingroup$
Wow, even a manual link! I have the power supply manual, I think. If anyone is interested I can scan it and upload it somewhere. I have a scope and check ripple, which might vary with load. Inspection makes a lot of sense. Changing the caps would be easy enough on equipment of this vintage, and probably cheaper than buying a variac.
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Thanks everyone. The answers and comments all have been very helpful!
$endgroup$
– kd4ttc
2 days ago
add a comment |
$begingroup$
If you're worried about it then get a capacitor ESR tester, desolder a few from the board and test the values of the caps and make sure they match the markings on the package. Also test the ESR. If you can find a datasheet for the caps, then you might find nominal ESR values there or find an equivalent capacitor in that range. If the ESR values seem high then replace the caps.
If that can't be done then find the voltage of the circuit and unsolder a few and test them with a supply, if they are leaking a lot of current, then don't use them.
It's probably better to replace them anyway if there is a question, especially any caps that could have large currents flow through them.
edited 2 days ago
brhans
9,11622129
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
$endgroup$
1
$begingroup$
I agree........+1
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:16
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
How long can equipment go unused before powering up runs the risk of damage?
Risk of damage is low, risk of poor operation from cap seal failure is high after 20 yrs, depending on many factors. ( See end)
This was an excellent transceiver. But it is so old that the service manual used MF for uF=μF and yet UH for uH=μH.
MF is these days means millifarads, not microfarads as in this unit service manual.
The 100W Tx will have need of good low ESR e-caps on supply for low ripple if they need replacing.
Do not operate Tx without a dummy load or antenna.
- Get the service manual below. or email to them for service related questions.
Get a DMM to measure Vdc and Vac ripple on large caps where the ripple voltage must be << 1% of Vdc to be considered good. ( Dissipation Factor, DF at 120Hz in datasheets.)
http://www.tentec.com/wp-content/uploads/2016/05/Argosy_II_Model_525_Manualf933.pdf
Unfortunately the service manual omitted the power supply board which is the main concern for worn out e-caps after 10 to 20 yrs with low C and high ESR values.
- so you **want to wing it* by looking for signs of slight end-bulge and measurements or hum on Rx or Tx.
- If everything looks OK, power it up. The only potential damage can be from pressing Tx without a load.
a portable RLC meter is often a good investment to verify caps out of the circuit.
anecdotal: When my Sanyo receiver was 15 yrs old and had spurious noise, I found one bad electrolytic or e-cap then replaced all of the similar size or bigger and discover a few more were also bad. so I ordered/replaced about a dozen of them. The cost of parts are cheap from Digikey and often less than the courier cost.
Cap conditioning.
At one-time Computer grade, 100k uF capacitors had high leakage currents which could be conditioned by a high series R to clear up the leakage currents. This, unfortunately, does nothing from failed caps that suffer from high Effective Series Resistance (ESR) and low Capacitance. As others have said. it won't help.
Like Batteries, also have wet electrolyte the age or MTBF is very much reputation of the brand used and it's high-temperature rating and the ratio of ripple current and voltage to the rated maximum.
E-caps are rated by hours of life at 85'C or 105'C or others since the accelerated life of 1500 hrs is all that caps can endure due to Arhennius Law. So not only is possible to generalize lifetime but suffice it to say, room temp seal quality, brand name and high temp rating, historical operating stress makes it impossible to predict. All I can say is even the best caps made in Japan will fail at some point, whether it is 5 yrs, 10 yrs or 50 yrs it is impossible to guess.
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
$endgroup$
2
$begingroup$
The trolls are back ( non-contributors = -2) and shall remain nameless.
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:10
$begingroup$
Wow, even a manual link! I have the power supply manual, I think. If anyone is interested I can scan it and upload it somewhere. I have a scope and check ripple, which might vary with load. Inspection makes a lot of sense. Changing the caps would be easy enough on equipment of this vintage, and probably cheaper than buying a variac.
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Thanks everyone. The answers and comments all have been very helpful!
$endgroup$
– kd4ttc
2 days ago
add a comment |
$begingroup$
How long can equipment go unused before powering up runs the risk of damage?
Risk of damage is low, risk of poor operation from cap seal failure is high after 20 yrs, depending on many factors. ( See end)
This was an excellent transceiver. But it is so old that the service manual used MF for uF=μF and yet UH for uH=μH.
MF is these days means millifarads, not microfarads as in this unit service manual.
The 100W Tx will have need of good low ESR e-caps on supply for low ripple if they need replacing.
Do not operate Tx without a dummy load or antenna.
- Get the service manual below. or email to them for service related questions.
Get a DMM to measure Vdc and Vac ripple on large caps where the ripple voltage must be << 1% of Vdc to be considered good. ( Dissipation Factor, DF at 120Hz in datasheets.)
http://www.tentec.com/wp-content/uploads/2016/05/Argosy_II_Model_525_Manualf933.pdf
Unfortunately the service manual omitted the power supply board which is the main concern for worn out e-caps after 10 to 20 yrs with low C and high ESR values.
- so you **want to wing it* by looking for signs of slight end-bulge and measurements or hum on Rx or Tx.
- If everything looks OK, power it up. The only potential damage can be from pressing Tx without a load.
a portable RLC meter is often a good investment to verify caps out of the circuit.
anecdotal: When my Sanyo receiver was 15 yrs old and had spurious noise, I found one bad electrolytic or e-cap then replaced all of the similar size or bigger and discover a few more were also bad. so I ordered/replaced about a dozen of them. The cost of parts are cheap from Digikey and often less than the courier cost.
Cap conditioning.
At one-time Computer grade, 100k uF capacitors had high leakage currents which could be conditioned by a high series R to clear up the leakage currents. This, unfortunately, does nothing from failed caps that suffer from high Effective Series Resistance (ESR) and low Capacitance. As others have said. it won't help.
Like Batteries, also have wet electrolyte the age or MTBF is very much reputation of the brand used and it's high-temperature rating and the ratio of ripple current and voltage to the rated maximum.
E-caps are rated by hours of life at 85'C or 105'C or others since the accelerated life of 1500 hrs is all that caps can endure due to Arhennius Law. So not only is possible to generalize lifetime but suffice it to say, room temp seal quality, brand name and high temp rating, historical operating stress makes it impossible to predict. All I can say is even the best caps made in Japan will fail at some point, whether it is 5 yrs, 10 yrs or 50 yrs it is impossible to guess.
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
$endgroup$
2
$begingroup$
The trolls are back ( non-contributors = -2) and shall remain nameless.
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:10
$begingroup$
Wow, even a manual link! I have the power supply manual, I think. If anyone is interested I can scan it and upload it somewhere. I have a scope and check ripple, which might vary with load. Inspection makes a lot of sense. Changing the caps would be easy enough on equipment of this vintage, and probably cheaper than buying a variac.
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Thanks everyone. The answers and comments all have been very helpful!
$endgroup$
– kd4ttc
2 days ago
add a comment |
$begingroup$
How long can equipment go unused before powering up runs the risk of damage?
Risk of damage is low, risk of poor operation from cap seal failure is high after 20 yrs, depending on many factors. ( See end)
This was an excellent transceiver. But it is so old that the service manual used MF for uF=μF and yet UH for uH=μH.
MF is these days means millifarads, not microfarads as in this unit service manual.
The 100W Tx will have need of good low ESR e-caps on supply for low ripple if they need replacing.
Do not operate Tx without a dummy load or antenna.
- Get the service manual below. or email to them for service related questions.
Get a DMM to measure Vdc and Vac ripple on large caps where the ripple voltage must be << 1% of Vdc to be considered good. ( Dissipation Factor, DF at 120Hz in datasheets.)
http://www.tentec.com/wp-content/uploads/2016/05/Argosy_II_Model_525_Manualf933.pdf
Unfortunately the service manual omitted the power supply board which is the main concern for worn out e-caps after 10 to 20 yrs with low C and high ESR values.
- so you **want to wing it* by looking for signs of slight end-bulge and measurements or hum on Rx or Tx.
- If everything looks OK, power it up. The only potential damage can be from pressing Tx without a load.
a portable RLC meter is often a good investment to verify caps out of the circuit.
anecdotal: When my Sanyo receiver was 15 yrs old and had spurious noise, I found one bad electrolytic or e-cap then replaced all of the similar size or bigger and discover a few more were also bad. so I ordered/replaced about a dozen of them. The cost of parts are cheap from Digikey and often less than the courier cost.
Cap conditioning.
At one-time Computer grade, 100k uF capacitors had high leakage currents which could be conditioned by a high series R to clear up the leakage currents. This, unfortunately, does nothing from failed caps that suffer from high Effective Series Resistance (ESR) and low Capacitance. As others have said. it won't help.
Like Batteries, also have wet electrolyte the age or MTBF is very much reputation of the brand used and it's high-temperature rating and the ratio of ripple current and voltage to the rated maximum.
E-caps are rated by hours of life at 85'C or 105'C or others since the accelerated life of 1500 hrs is all that caps can endure due to Arhennius Law. So not only is possible to generalize lifetime but suffice it to say, room temp seal quality, brand name and high temp rating, historical operating stress makes it impossible to predict. All I can say is even the best caps made in Japan will fail at some point, whether it is 5 yrs, 10 yrs or 50 yrs it is impossible to guess.
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
$endgroup$
How long can equipment go unused before powering up runs the risk of damage?
Risk of damage is low, risk of poor operation from cap seal failure is high after 20 yrs, depending on many factors. ( See end)
This was an excellent transceiver. But it is so old that the service manual used MF for uF=μF and yet UH for uH=μH.
MF is these days means millifarads, not microfarads as in this unit service manual.
The 100W Tx will have need of good low ESR e-caps on supply for low ripple if they need replacing.
Do not operate Tx without a dummy load or antenna.
- Get the service manual below. or email to them for service related questions.
Get a DMM to measure Vdc and Vac ripple on large caps where the ripple voltage must be << 1% of Vdc to be considered good. ( Dissipation Factor, DF at 120Hz in datasheets.)
http://www.tentec.com/wp-content/uploads/2016/05/Argosy_II_Model_525_Manualf933.pdf
Unfortunately the service manual omitted the power supply board which is the main concern for worn out e-caps after 10 to 20 yrs with low C and high ESR values.
- so you **want to wing it* by looking for signs of slight end-bulge and measurements or hum on Rx or Tx.
- If everything looks OK, power it up. The only potential damage can be from pressing Tx without a load.
a portable RLC meter is often a good investment to verify caps out of the circuit.
anecdotal: When my Sanyo receiver was 15 yrs old and had spurious noise, I found one bad electrolytic or e-cap then replaced all of the similar size or bigger and discover a few more were also bad. so I ordered/replaced about a dozen of them. The cost of parts are cheap from Digikey and often less than the courier cost.
Cap conditioning.
At one-time Computer grade, 100k uF capacitors had high leakage currents which could be conditioned by a high series R to clear up the leakage currents. This, unfortunately, does nothing from failed caps that suffer from high Effective Series Resistance (ESR) and low Capacitance. As others have said. it won't help.
Like Batteries, also have wet electrolyte the age or MTBF is very much reputation of the brand used and it's high-temperature rating and the ratio of ripple current and voltage to the rated maximum.
E-caps are rated by hours of life at 85'C or 105'C or others since the accelerated life of 1500 hrs is all that caps can endure due to Arhennius Law. So not only is possible to generalize lifetime but suffice it to say, room temp seal quality, brand name and high temp rating, historical operating stress makes it impossible to predict. All I can say is even the best caps made in Japan will fail at some point, whether it is 5 yrs, 10 yrs or 50 yrs it is impossible to guess.
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
edited 2 days ago
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
answered Apr 19 at 21:36
Sunnyskyguy EE75Sunnyskyguy EE75
72.1k227103
72.1k227103
2
$begingroup$
The trolls are back ( non-contributors = -2) and shall remain nameless.
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:10
$begingroup$
Wow, even a manual link! I have the power supply manual, I think. If anyone is interested I can scan it and upload it somewhere. I have a scope and check ripple, which might vary with load. Inspection makes a lot of sense. Changing the caps would be easy enough on equipment of this vintage, and probably cheaper than buying a variac.
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Thanks everyone. The answers and comments all have been very helpful!
$endgroup$
– kd4ttc
2 days ago
add a comment |
2
$begingroup$
The trolls are back ( non-contributors = -2) and shall remain nameless.
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:10
$begingroup$
Wow, even a manual link! I have the power supply manual, I think. If anyone is interested I can scan it and upload it somewhere. I have a scope and check ripple, which might vary with load. Inspection makes a lot of sense. Changing the caps would be easy enough on equipment of this vintage, and probably cheaper than buying a variac.
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Thanks everyone. The answers and comments all have been very helpful!
$endgroup$
– kd4ttc
2 days ago
2
2
$begingroup$
The trolls are back ( non-contributors = -2) and shall remain nameless.
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:10
$begingroup$
The trolls are back ( non-contributors = -2) and shall remain nameless.
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:10
$begingroup$
Wow, even a manual link! I have the power supply manual, I think. If anyone is interested I can scan it and upload it somewhere. I have a scope and check ripple, which might vary with load. Inspection makes a lot of sense. Changing the caps would be easy enough on equipment of this vintage, and probably cheaper than buying a variac.
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Wow, even a manual link! I have the power supply manual, I think. If anyone is interested I can scan it and upload it somewhere. I have a scope and check ripple, which might vary with load. Inspection makes a lot of sense. Changing the caps would be easy enough on equipment of this vintage, and probably cheaper than buying a variac.
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Thanks everyone. The answers and comments all have been very helpful!
$endgroup$
– kd4ttc
2 days ago
$begingroup$
Thanks everyone. The answers and comments all have been very helpful!
$endgroup$
– kd4ttc
2 days ago
add a comment |
$begingroup$
If you're worried about it then get a capacitor ESR tester, desolder a few from the board and test the values of the caps and make sure they match the markings on the package. Also test the ESR. If you can find a datasheet for the caps, then you might find nominal ESR values there or find an equivalent capacitor in that range. If the ESR values seem high then replace the caps.
If that can't be done then find the voltage of the circuit and unsolder a few and test them with a supply, if they are leaking a lot of current, then don't use them.
It's probably better to replace them anyway if there is a question, especially any caps that could have large currents flow through them.
edited 2 days ago
brhans
9,11622129
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
$endgroup$
1
$begingroup$
I agree........+1
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:16
add a comment |
$begingroup$
If you're worried about it then get a capacitor ESR tester, desolder a few from the board and test the values of the caps and make sure they match the markings on the package. Also test the ESR. If you can find a datasheet for the caps, then you might find nominal ESR values there or find an equivalent capacitor in that range. If the ESR values seem high then replace the caps.
If that can't be done then find the voltage of the circuit and unsolder a few and test them with a supply, if they are leaking a lot of current, then don't use them.
It's probably better to replace them anyway if there is a question, especially any caps that could have large currents flow through them.
edited 2 days ago
brhans
9,11622129
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
$endgroup$
1
$begingroup$
I agree........+1
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:16
add a comment |
$begingroup$
If you're worried about it then get a capacitor ESR tester, desolder a few from the board and test the values of the caps and make sure they match the markings on the package. Also test the ESR. If you can find a datasheet for the caps, then you might find nominal ESR values there or find an equivalent capacitor in that range. If the ESR values seem high then replace the caps.
If that can't be done then find the voltage of the circuit and unsolder a few and test them with a supply, if they are leaking a lot of current, then don't use them.
It's probably better to replace them anyway if there is a question, especially any caps that could have large currents flow through them.
edited 2 days ago
brhans
9,11622129
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
$endgroup$
If you're worried about it then get a capacitor ESR tester, desolder a few from the board and test the values of the caps and make sure they match the markings on the package. Also test the ESR. If you can find a datasheet for the caps, then you might find nominal ESR values there or find an equivalent capacitor in that range. If the ESR values seem high then replace the caps.
If that can't be done then find the voltage of the circuit and unsolder a few and test them with a supply, if they are leaking a lot of current, then don't use them.
It's probably better to replace them anyway if there is a question, especially any caps that could have large currents flow through them.
edited 2 days ago
brhans
9,11622129
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
edited 2 days ago
brhans
9,11622129
edited 2 days ago
brhans
9,11622129
edited 2 days ago
brhans
9,11622129
9,11622129
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
answered Apr 19 at 21:05
laptop2dlaptop2d
28.2k123786
28.2k123786
1
$begingroup$
I agree........+1
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:16
add a comment |
1
$begingroup$
I agree........+1
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:16
1
1
$begingroup$
I agree........+1
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:16
$begingroup$
I agree........+1
$endgroup$
– Sunnyskyguy EE75
Apr 19 at 22:16
add a comment |
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$begingroup$
Electrolytics can also dry out...reforming can't do anything about that.
$endgroup$
– Toor
Apr 19 at 19:41
1
$begingroup$
You should probably seek input from other users of that model on an Amateur Radio forum. The question is not really on topic here, because it is about the usage/repair of a product for which you are not providing any design information.
$endgroup$
– Chris Stratton
Apr 19 at 20:46
1
$begingroup$
@ChrisStratton hm, maybe the question of "would the proposed procedure actually help, and does it potentially have any downsides for devices from the mid-80ies" would be more on-topic?
$endgroup$
– Marcus Müller
Apr 19 at 21:00
1
$begingroup$
@MarcusMüller - this kind of gear is designed to actually be maintained and has a technically aware user community. Consulting that expertise is much better than taking guesses from first principles.
$endgroup$
– Chris Stratton
Apr 19 at 21:22
1
$begingroup$
Let's just say that the whole idea of a post apocalyptic scavenger finding and getting modern electronics or vehicles operational is highly unlikely, unless they can produce new capacitors from scratch. Those are really the biggest failure point.
$endgroup$
– Passerby
2 days ago