Hi, I have a Phonic Max 1500 power amplifier. One of the channels is distorted only under load.
Another problem is that the schematic I found online does not matches to the amp's PCB.
For example: in the schematic there are 2608 op amps on the pre amp section while in reality there are two 5532 and a half of 13700D per channel. Also the components values and numbers are mismatch with the schematic.
Does some one have the schematic for this version?
Any idea how to troubleshoot this distortion issue?
Here you can see pictures of the output signal with and without 8 Ohm load, also attached pictures of the PCB's and a link to the schematic:
Another problem is that the schematic I found online does not matches to the amp's PCB.
For example: in the schematic there are 2608 op amps on the pre amp section while in reality there are two 5532 and a half of 13700D per channel. Also the components values and numbers are mismatch with the schematic.
Does some one have the schematic for this version?
Any idea how to troubleshoot this distortion issue?
Here you can see pictures of the output signal with and without 8 Ohm load, also attached pictures of the PCB's and a link to the schematic:
Attachments
Just looking at the scope pictures you have a "recovery " problem with the negative power supply and/or bad connection /bad soldering joint in the negative power device .
I take it you have checked it okay to the driver section with your scope ---when under LOAD ?
I take it you have checked it okay to the driver section with your scope ---when under LOAD ?