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Old 12-30-2017, 06:52 AM
~rf~ ~rf~ is offline
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Default 888 fails to power up

Any help would be much appreciated. Even if it is confirmation of power supply failure.
Today I had a situation happen on not one but 2 888 i/o interfaces. When I powered up one of the 888 interfaces, it lit up briefly then went dark. I don't use this old digi rig much anymore. when I powered on the 1st 888 it lit up briefly, went dark and then began to pulse like a metronome thru the outputs. I then powered the second and it seemed to be fine, so to use the system I disconnected the master slave cable and the 1st 888 cable and repowered the 2nd 888. It failed within seconds. These units worked fine just several months ago.

I have good power and these units are mostly disconnected from a/c when not in use to avoid potential damage from spikes or strikes.
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Old 12-30-2017, 06:58 AM
~rf~ ~rf~ is offline
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Default Re: 888 fails to power up

I opened up the 888/24 I/O interface that failed first. Did some troubleshooting and when I disconnect the output ribbon cable, it powers up.
Is it possible that something has failed in the output circuit?
Does the power supply have a circuit for the output bus?

I have another older 888 16 bit that has the same symptoms. I can really hear the clicks coming from something somewhere either on the main board or the power supply.
Does anyone know what has failed and if this part is easily replaced/repaired?
Is there a schematic available for these older outdated interfaces?

Thanks
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Old 12-30-2017, 07:11 AM
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Wizzoboy Wizzoboy is offline
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Default Re: 888 fails to power up

If the power supplies have any electrolytic capacitors in them, check those. With age they tend to fail. A sign to look for is bulging ends.
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Old 12-30-2017, 07:15 AM
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Default Re: 888 fails to power up

Quote:
Originally Posted by Wizzoboy View Post
If the power supplies have any electrolytic capacitors in them, check those. With age they tend to fail. A sign to look for is bulging ends.
Thanks Wizzoboy! I was thinking that capacitors may be the case. I'll have a better look when I get to the shop today.
I did a voltage check on the leads from the power supply to the main board and it appears the voltage is correct compared to a working unit.
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