Re: Altec MX6021
A very late post, but I had some time and the spares handy and got down to replacing the spares on the primary side. Connected the lamp in series and there's no short anymore. There's no output too. Does anyone know if the power supply needs to be connected to the amplifier board to switch on the power supply or I should be getting voltage without connecting to the amplifier board. I get around 1.7 to 1.9 volts DC at the input of the octacoupler, nothing on the output. Replaced caps at the secondary side, still nothing.
Thanks for any help I can get...
lincolnkorg
Member
Last Activity: 05-28-2021, 07:44 AM
Joined: 06-19-2018
Location: Bangalore
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Re: Altec MX6021
Hey Momaka and Kaboom. The IC actually looks fine to the naked eye, good catch. I’ll replace it anyway to be sure. Either way I will use the incandescent bulb, getting these components are a long wait this side of the world. So not going to risk it at any cost.
Thank you for the tips on the caps and diodes. Finding the ratings of these components is a challenge without markings on them or schematics. You guys have been very helpful. Cannot thank you guys enough.
At this rate pretty much all the components on the primary side needs...Leave a comment:
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Re: Altec MX6021
Thank you Momaka. The brad names you mentioned are super helpful. Will look for these brands. Will be careful about those big resistors.
For the bridge rectifier, will any part number close to the one mentioned on the diode do or do they have to be a perfect match?
Thanks a mil for your time and sharing your knowledge.Leave a comment:
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Re: Altec MX6021
Does anyone know the values of the resistors in the heat shrink tubes. R25, 26, 27, 28 along with the wattage? Would be handy to know the values of the rest of the reaistors as well.
Thanks in advance.Leave a comment:
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Re: Altec MX6021
Thabk you Momaka and Behemoth.
So its safe to leave the those SMD caps as they are. Im learning and this is great knowledge to have.
To reduce the cost, im going to the local market this weekend to source as many components as I can and then order the rest from Aliexpress or UTSource.
Thanks so much once again folks for the inputs and help. Much appreciated.Leave a comment:
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Re: Altec MX6021
Here are the pictures of the secondary side....Leave a comment:
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Re: Altec MX6021
Thank you so much Momaka.
I will follow the steps you mentioned. Will take a while for to source all the spares and get them shipped. I will attach pictures shortly.
A couple questions. Do SMD caps have polarity? C25 is the SMD in question. Also im not sure the 4 SMD resistors are of the right values. A picture posted here showed those resistor values as 1R00. The value of the ones on the board read 1002.
Thank you so much once again for taking the time to go through the pictures and giving dicrectuons from where to start....Leave a comment:
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Re: Altec MX6021
Hope these pictures help....Leave a comment:
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Re: Altec MX6021
Thank you for your reply Agent24, I will take some pictures of these parts and post them in the evening. Thanks so much once again, much appreciated.Leave a comment:
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Re: Altec MX6021
Has anyone had success in repairing the power supply? I am a hobbyist, got a unit from a friend to fix. Someone has already tried working on the board earlier.
So far from what I've tested, the fuse, rectifier diodes, mosfet, the 4 SMD resistors at the bottom, filter cap (bulged on the top) seems to be the problem. Do zener diodes need to be replaced? Does anyone have all the part numbers? What else could have failed along the way.
I also noticed that C25 was mounted in an angel, wondering if this was tampered by the previous person who...Leave a comment:
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