CNM Primus 8 ch Power Fault

[acestu]

Hi,

 

I have a CNM Primus 8 channel DVR with a weird power fault, ie if you plug the power supply in and then switch on there are no lights on the front and it seems dead, if I dissconect the hdd molex connector then the board will run and lights come on, the hard drive is fine and if I power it seperately from a bench supply then it spins up and I can get the system up, if anyone has any advice or a schematic for the board I would be grateful.

 

thanks in advance

Stuart

[sjsturner]

If the HDD is definitely ok then it would seem that the power supply is struggling to power both parts.

 

 

either psu is buggered or is not the correct psu?

[acestu]

Hi,

 

I have the correct voltages on the molex connector, what I am thinking is that I have been given the power supply for the cameras as it has a 6 way adapter on it, the owner swears that it is the only power supply, looking at the pcb it has by the looks of things a hefty rectifier diode and some smoothing caps and regulators so i am thinking that it should be a raw ac adapter rather than a 5amp dc supply, it is not marked on the input it just says 12v but if I could get some documentation or if somebody could tell me what there power supply is for this dvr that would be magic.....

 

Thanks

Stuart

[PeterJames]

It drops under load check the current on the PSU 

[acestu]

Hi,

 

I have tried powering the unit up with my 12 volt 10amp bench power supply and it does exactly the same thing, so thats 3 dc power supplies I have tried....

 

Thanks

Stuart

[al-yeti]

2 hours ago, acestu said:

Hi,

 

I have tried powering the unit up with my 12 volt 10amp bench power supply and it does exactly the same thing, so thats 3 dc power supplies I have tried....

 

Thanks

Stuart

You try another HDD?

[al-yeti]

 

Or buy one of those cheap adaptors eBay , power up the HDD independentlythen it will prove your theory , whatever the theory is lol

 

Should work if its the HDD dropping it through internal pay

 

Either way isn't this skip fodder?

 

[SystemQ]

From a quick google search I found this;

 

https://www.amazon.co.uk/SECURE-CHANNEL-RECORDER-STORAGE-VIEWING/dp/B00HHBLJ64

 

Buried in the spec it says: -  Power Source DC 19V/3A Power Consumption 60W

 

So if it looks like that one perhaps it needs a19V psu not 12V which may be the problem.

 

If you have a variable bench one you could try that and slowly bring the voltage up, even a 13.8V one (lead acid charger) may boot it up for testing.

 

Paul.

[acestu]

Hi guys,

 

Yes tried 3 hard drives Yeti, I have several hdd power adapters but switching the drive on and the box on seperately sounds like disaster left with a customer, System Q, excellent find, my search brought this up but I saw that it was currently unavailable and I was looking for cnm's details so I could ring them, but I reckon it could be a 19v AC adapter as all the conversion components are on the pcb,,,,,,,I will let you know 

 

Thanks

Stuart

[acestu]

Hi,

 

Just tried ramping dc voltage up to 19v still no joy, the case fan seemed to go a lot faster though so if it is connected directly to the input after the on switch then this would suggest that a 12 volt dc fan should be supplied with 12 volts dc and not nineteen, I can't trace the tracks on the pcb as it is multi layered..........

 

Thanks

Stuart