How to repair failing Dynamiks
Posted: 2019-09-07 18:48
Some time ago my M4100/D began to make funny clicking noise (mechanical/relay). Soon after it died completely.
The power supply was out of business. I was trying to find another power supply without luck.
Now - I don't give up so easily. I found out the standby power supply didn't work.
It is a smal SMPS build around af TopSwitch 223 from Power Integrators.
It should be 12 Volt DC to power other circuits.
I started out replacing the TopSwith since it is obsolete and hard to find (it is always these failing...).
It didn't help so i started to see if I could find other failing components around the TopSwitch, but no success.
I even meassured capacitors but all was fine.
I tried a external 12V power supply and it worked fine - but not practical with an external LAB supply.... wires all around.
The project stalled until earlier this year and I gave it another shot.
I started replacing the most critical capacitor and believe or not - it worked!
The standby power supply is basicly like in the datasheet.
https://ac-dc.power.com/sites/default/f ... 21-227.pdf
The failing capacitor is C5 on page 6 in the datasheet.
It is a 22uF/16V SMD
Remember - I have allready tested the cap and the capacity I meassured was fine - around 22uF.
So I guess it is ESR related but my capacitor tester can't meassure ESR.
Why I post this now?? My M-DSI just did the same (it just died) a few days ago. I replaced the cap and we're playing again.
That's why I think I'm not the only one out there and this might help you.
Both are facing their 10 year birthday.
If your dynamik is constantly powered it will continue to work. You will only see it fail if you switch it off (and on...).
Mine is always powered.
If your'e interested I can send some pictures with instructions.
Good luck
Disclaimer :
The normal stuff - own risk - high voltage - don't kill yourself etc.
The power supply was out of business. I was trying to find another power supply without luck.
Now - I don't give up so easily. I found out the standby power supply didn't work.
It is a smal SMPS build around af TopSwitch 223 from Power Integrators.
It should be 12 Volt DC to power other circuits.
I started out replacing the TopSwith since it is obsolete and hard to find (it is always these failing...).
It didn't help so i started to see if I could find other failing components around the TopSwitch, but no success.
I even meassured capacitors but all was fine.
I tried a external 12V power supply and it worked fine - but not practical with an external LAB supply.... wires all around.
The project stalled until earlier this year and I gave it another shot.
I started replacing the most critical capacitor and believe or not - it worked!
The standby power supply is basicly like in the datasheet.
https://ac-dc.power.com/sites/default/f ... 21-227.pdf
The failing capacitor is C5 on page 6 in the datasheet.
It is a 22uF/16V SMD
Remember - I have allready tested the cap and the capacity I meassured was fine - around 22uF.
So I guess it is ESR related but my capacitor tester can't meassure ESR.
Why I post this now?? My M-DSI just did the same (it just died) a few days ago. I replaced the cap and we're playing again.
That's why I think I'm not the only one out there and this might help you.
Both are facing their 10 year birthday.
If your dynamik is constantly powered it will continue to work. You will only see it fail if you switch it off (and on...).
Mine is always powered.
If your'e interested I can send some pictures with instructions.
Good luck
Disclaimer :
The normal stuff - own risk - high voltage - don't kill yourself etc.