Autotek MX5000
Good morning everybody
I'm from South Africa, we have and amp named Starsound and model number SSA-D5000, its basically dual channel class D(X) version of the Autotek MX2000 from Perry's ART. Basically its a Autotek MX5000, as per pics vailable on the internet, they are identical in every way.
The amp came in with blown power supply and output transistors. After removing all fets and checking the drive waves in power and output sections, I noticed the power supply was fine so i fitted some test fets and continued with output.
when checking the class D switch, i found ther to be a coroded and severed VCC trace to one of the driver boards, this was the (B) channel and i ran a jumper from the driverboard pin directly to the high rail (which is where i calculate it to run to)
the one channel (A) wave forms seems perfect. when remote signal is applied and rails build, the class d switch begins after a small time delay on both high and low sides and rides along the rail voltage on the mosfet gates, the Vac RMS of the switching wave is 6.89v
the other channel (B) is a little different. when remote is applied, the rails build and the switch wave attempts to build alongside (A) but then the switching stops, after this the amp starts switching but the switch wave sort of ramps itself up over a time period of about 2~3mins and only reaches a maximum Vac RMS of about 5.42v on both the high and low sides. the shape of the wave somewhat approaches channel(A) as well but it just isnt the same. due to equipment constraints, i can't really zoom in and disect the wave.
a huge(5W) 0.22ohm (derived from symetry) resistor on the high side was also burnt to shreds when the amp came in and also replaced
i havent fitted any FETS in the output section, im used to seeing symetrical channels do identical "things", would imagine my channel (A) is ideal and channel (B) faulty. the (B) channel VCC trace was corroded and repaired too.
if anybody could offer advice/assistance on how to make my channel (B) work like channel (A), it would be greatly appreciated, i dont even know where to start.
Thanks in advance
Good morning everybody
I'm from South Africa, we have and amp named Starsound and model number SSA-D5000, its basically dual channel class D(X) version of the Autotek MX2000 from Perry's ART. Basically its a Autotek MX5000, as per pics vailable on the internet, they are identical in every way.
The amp came in with blown power supply and output transistors. After removing all fets and checking the drive waves in power and output sections, I noticed the power supply was fine so i fitted some test fets and continued with output.
when checking the class D switch, i found ther to be a coroded and severed VCC trace to one of the driver boards, this was the (B) channel and i ran a jumper from the driverboard pin directly to the high rail (which is where i calculate it to run to)
the one channel (A) wave forms seems perfect. when remote signal is applied and rails build, the class d switch begins after a small time delay on both high and low sides and rides along the rail voltage on the mosfet gates, the Vac RMS of the switching wave is 6.89v
the other channel (B) is a little different. when remote is applied, the rails build and the switch wave attempts to build alongside (A) but then the switching stops, after this the amp starts switching but the switch wave sort of ramps itself up over a time period of about 2~3mins and only reaches a maximum Vac RMS of about 5.42v on both the high and low sides. the shape of the wave somewhat approaches channel(A) as well but it just isnt the same. due to equipment constraints, i can't really zoom in and disect the wave.
a huge(5W) 0.22ohm (derived from symetry) resistor on the high side was also burnt to shreds when the amp came in and also replaced
i havent fitted any FETS in the output section, im used to seeing symetrical channels do identical "things", would imagine my channel (A) is ideal and channel (B) faulty. the (B) channel VCC trace was corroded and repaired too.
if anybody could offer advice/assistance on how to make my channel (B) work like channel (A), it would be greatly appreciated, i dont even know where to start.
Thanks in advance
Last edited: