Maker Pro
Maker Pro

Prosound 1600 amplifier repair

Wayne Phillips

Jan 7, 2018
61
Joined
Jan 7, 2018
Messages
61
This branded amplifier from a well known electronics store came to me for repair.

The fault trying to power up said the owner?

Well on opening it for a quick look I noticed the inrush circuit was missing a inrush ntc to slow the mass inrush voltage.
What they seem to of done here was to add a cap across the relay that is also connected to the primary side of the transformer ie..as the mains power is applied ii feeds one part of the winding then after a second or so the relay clicks over and the cap is to smooth the spark.

Poor idea..so a I have fitted a better inrush device and the amp is back working again.
 

shrtrnd

Jan 15, 2010
3,869
Joined
Jan 15, 2010
Messages
3,869
I hope you added a 're-engineering fee' to the final bill.
Good work.
 

Harald Kapp

Moderator
Moderator
Nov 17, 2011
13,632
Joined
Nov 17, 2011
Messages
13,632
It's mostly about money saved. Even pennies add up when you sell in masses.
 

Wayne Phillips

Jan 7, 2018
61
Joined
Jan 7, 2018
Messages
61
Even the amplifier stage could of done with more devices to cope with meant to be 500w at 4 ohms!
 

Subaru

Jul 15, 2018
2
Joined
Jul 15, 2018
Messages
2
Got a prosound 1600 amp,and the two power needles don't work and the sound is only coming on of one side?what can be done.
 

kellys_eye

Jun 25, 2010
6,473
Joined
Jun 25, 2010
Messages
6,473
Find the workshop manual for it. Post a link to it and/or the schematic for the amplifier.
 

Dataman

Jun 22, 2023
3
Joined
Jun 22, 2023
Messages
3
Hi All
just joined the forum.
anyone got a schematic for this amp?
I‘ve been asked to repair one of these.
 

Martaine2005

May 12, 2015
4,888
Joined
May 12, 2015
Messages
4,888
Hi All
just joined the forum.
anyone got a schematic for this amp?
I‘ve been asked to repair one of these.
Very doubtful one exists, unless someone reverse engineered it and drew one.
But again, doubtful as it’s a cheap Maplin amp.
You might get more help by describing the amps problem.

Martin
 

Dataman

Jun 22, 2023
3
Joined
Jun 22, 2023
Messages
3
Hi Martin
Thanks for the advice. I should receive it over the weekend & will then be able to give a more accurate description of the fault. Pete.
 

Dataman

Jun 22, 2023
3
Joined
Jun 22, 2023
Messages
3
Seems to be the same problem Wayne Phillips experienced a while back, as above.
On power up it’s a 50/50 chance it takes out my 16amp trip. Once successfully powered up, the amp seems to operate without issues. It even sounds better than I was expecting. At this point I have not fully load tested for any significant time period yet.
Wayne, you say “I have fitted a better inrush device and the amp is back working again”
Did you just fit an ntc device in series on the primary side of the transformer?
Regards
 
Top