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PSU on Oregon Scientific HMS388 Hi-Fi went US. Noisy hum. ecee and one of the PSU pol caps was soldered in the wrong way round and had exploded. replaced it but PSU won't start up past a quick burst of initial power. Do you have schematic or idea how to find out how switched mode PSU works?

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SOURCE: hi i need help

Here's the link to the drivers page for the DS6618

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SOURCE: JBL sub PSW-D110 hums, and the fuse is blown

here is the manual, I am looking for a more detailed version

Posted on Mar 25, 2008

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SOURCE: oregon scientific walkie talkies

Hi Neil

You can obtain the Owner's Manual (Contains simple instructions) from link below

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SOURCE: My Philips mini hi-fi unit

if it has been in standby for years the power supply has died .dont bother to much to fix £150 plus ditch it commo fault with all units left in standby they die in the end regards kirk

Posted on Dec 09, 2008

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SOURCE: Oregon Scientific VR399 Handheld Digital

I have misplaced my driver also and my device is full of recordings I dont want to delete.

Posted on Apr 13, 2009

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Have you considered it might be overheating? Does the fan make a loud sound after a few minutes?

Also here you can find technical documents on this model,

Aug 27, 2013 | Audio Players & Recorders

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I have a Hi-Fi stereo with with turntable, two cassettes, three cd's two jacks for audio, one for MP3, and one for earphone the brand is memorex the audio has quit the hi-fi was built sept 2006 how do...

Ok, well whenever any Amplifiers Output suddenly quits, it is usually only one of two things, or possibly both, and they are The main Power Supply Unit, has faulted. The Main Audio Amplifier has failed, or as said, both.
Replacement, of the faulty component is the only real alternative.
If you wish to DIY, then you will need a service manual, for your exact make and model. Tools, Soldering Iron, Multi-meter, De-soldering Pump.
If it turns out to be the PSU, then this is a pretty simple drop in replacement, however IF it is the Audio Output Module, then this must be De-soldered from the PCB, and the new one re-soldered back in.pretty simple if done slowly and carefully.
If you do not wish to DIY, then i recommend that you obtain a "Quote" for any repairs from an authorised service center for Memorex. Contact them and ask for a referral to a service center that they recommend clos by where you live. it may even be best if they accept, to return it to them for repair?

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What could be causing a power hum for about 1 to 2 minutes after startup? Sony STR-DE825

Depends where the hum originates. If it is from the case, it is likely from the transformer which may rattle laminations a bit till it warms.

If it is out of the speakers, then the amplifiers MAY not be balancing till warm up... that would not be good... keep your eye on that and if it gets loud, take it for repair ASAP.

If unit is old, the filter caps may be going bad OR there may be a bad solder joint in the power supply area that doesn't contact till it gets warm... that also needs fixing ASAP.

Dec 26, 2009 | Sony STR-DE825 Receiver

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My Philips mini hi-fi unit was on eco-power, and when i went to switch it on, the red light went out but the unit didn't come on. The unit now doesn't work and it's nothing to do with the plug or the...

if it has been in standby for years the power supply has died .dont bother to much to fix £150 plus ditch it commo fault with all units left in standby they die in the end regards kirk

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Ferguson FRG-R121D digital radio doesn't work. Only works on fm stations and then very poorly. Takes a long time to switch on with continuous clicking noise.

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A HUMMING Peavey Classic 30

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Shuts off about 5 sec. after i turn it on

The power amp module ( s) have probably "bought the farm"

Post what part numbers you find on them.

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