Hi all,
Have a Densen DM-30 in to be repaired and my repair tech is looking for the service manual/ schematic to help trace the fault.Anyone out there in DiyAudio land have such a thing?
🙂
He’s had a inspection and he reports that “both output relays aren’t engaging.“
To help, any idea Guys as to what area the fault may lie in?
Recent repair work was done by amps previous user, wonder if it’s in the same ballpark?
From his Technicians repair paperwork...(and I quote...)
“Diagnostic indicated high offset (DC) in output with several components burned, in the output circuit. Failure found in IC that supervises Protection; it was short circuited and burned adjacent components.
All parts removed and changed, offset set and bias done in both channels. Stress test and all showed fine.
So if both Output relays on Amp aren’t engaging....possible connection to what was at fault before?
Are output relays connected to protection circuit in the Densen?
Thanks very much.
Just bought the Amp and it arrived DOA on right channel - after a 4 week wait on delivery...so quite frustrating!
Have a Densen DM-30 in to be repaired and my repair tech is looking for the service manual/ schematic to help trace the fault.Anyone out there in DiyAudio land have such a thing?
🙂
He’s had a inspection and he reports that “both output relays aren’t engaging.“
To help, any idea Guys as to what area the fault may lie in?
Recent repair work was done by amps previous user, wonder if it’s in the same ballpark?
From his Technicians repair paperwork...(and I quote...)
“Diagnostic indicated high offset (DC) in output with several components burned, in the output circuit. Failure found in IC that supervises Protection; it was short circuited and burned adjacent components.
All parts removed and changed, offset set and bias done in both channels. Stress test and all showed fine.
So if both Output relays on Amp aren’t engaging....possible connection to what was at fault before?
Are output relays connected to protection circuit in the Densen?
Thanks very much.
Just bought the Amp and it arrived DOA on right channel - after a 4 week wait on delivery...so quite frustrating!
If it arrived DOA send it back.
Or absolute minimum send it back anyway so "his Tech" can repair it a second time.
Or absolute minimum send it back anyway so "his Tech" can repair it a second time.
Absolutely agree with JM Fahey don't let anybody "muck you around " your hard worked for money has paid for it you deserve better.
I came across this type of "selling " many times before on a UK help website where faulty goods were shipped "as new/brand new " and arrived faulty /broken etc .
UK Sale of Goods Act
Legislation.gov.uk
scroll to Section 14
You have the right to reject faulty goods and if you have accepted them then the seller must repair them and if the repairs are substandard then you have the right (after two attempts ) to reject the goods.
I came across this type of "selling " many times before on a UK help website where faulty goods were shipped "as new/brand new " and arrived faulty /broken etc .
UK Sale of Goods Act
Legislation.gov.uk
scroll to Section 14
You have the right to reject faulty goods and if you have accepted them then the seller must repair them and if the repairs are substandard then you have the right (after two attempts ) to reject the goods.
Thanks guys,
I hear you with all that, and absolutely...
But not sure if it’s that kind of situation to be fair.
Great over time comms from Seller (inc. Skype call pre sale) and after discussion of the issue we have agreed that he will foot the repair cost, given provided Repair Report etc.
With Covid delays, and all that stressful stuff we decided together best sort it here and he pays the (hopefully not too much) cost.
Updated him this morning with an update actually, got back to me right away.
In my post,
I was more asking to get some more insight to Technical aspects of the fault to get a better understanding, (can fit thru hole caps but that’s about my limit!) and to maybe help my Repair guy.
Heh, he may actually be a member here who knows.
I’ve reached out to Densen to see if they can supply a SM or a circuit schematic, but in parallel to that asking here to help me understand a bit better. ☺️
Thanks much.
I hear you with all that, and absolutely...
But not sure if it’s that kind of situation to be fair.
Great over time comms from Seller (inc. Skype call pre sale) and after discussion of the issue we have agreed that he will foot the repair cost, given provided Repair Report etc.
With Covid delays, and all that stressful stuff we decided together best sort it here and he pays the (hopefully not too much) cost.
Updated him this morning with an update actually, got back to me right away.
In my post,
I was more asking to get some more insight to Technical aspects of the fault to get a better understanding, (can fit thru hole caps but that’s about my limit!) and to maybe help my Repair guy.
Heh, he may actually be a member here who knows.
I’ve reached out to Densen to see if they can supply a SM or a circuit schematic, but in parallel to that asking here to help me understand a bit better. ☺️
Thanks much.
Have highlighted the ofsset pots
The timer/protection looks like it might be the same as the beat 100
Schematic for the audio amplifier Densen B-100. - Service Manual Free Download
The timer/protection looks like it might be the same as the beat 100
Schematic for the audio amplifier Densen B-100. - Service Manual Free Download
