I have completed the board to the very last detail then assembled everything into the case provided and carried out the suggested tests and set the Bias according to the recommended voltages in the manual, but for some odd reason my finished product doesn’t recognize incoming signals and stays in it standby mode slow flashing the check light to signal so, but i also found it leaks through an quiet yet extremely distorted signal even when in this state.
I have checked every component possible for bad eggs but I have found nothing, I have also checked all of the soldering joints to ensure I didn’t slip up somewhere but I cant find anything out of order. i would love to get this or these issues fixed, does anyone know what I am doing wrong?
Thanks in advance!
Most likely an assembly problem.
Sorry, this forum does not allow picture uploads
If you can provide LINKS (e.g. by using a free online picture base) to HI-RES and SHARP pics of your assembly (both solder- and component side)
then we can take a look and provide some feedback.
Just to give more detail of where i found damage, R3 burst wide open, R43 gained several hundreds of resistance and TIP147 showed signs of blistering on its surface and TIP142 showed slight signs of burning. I have checked all diodes to check for any more damage in them but found no abnormal signs, there is no other visible damage but i will try replacing all transistors for good measure.
Is there any other damage that may have happened that i should look for such as the IC’s, capacitors or remaining resistors?
Thank-you so much for your help fixing my mess up,
but i sadly have another problem which is sort of linked to the original problem which was during the short lifespan of the amplifier when i finally got it amplifying right, the check light was still flashing slow and the standby light was still on (but dim) indicating it still thinks it is in standby mode yet it was amplifying near-perfectly, could this possibly be a problem around the PIC IC like a short circuit?
I must thank-you again for putting up with my dumbness with this circuit, i think i bit off more than i could chew haha!
Little update on the status of my many problems and a few new things that are now wrong,
I have replaced all of the transistors except T6 as advised and have now replaced the other damaged components as mentioned before being the 2 power transistors and the 2 resistors (R3 and R43).
After replacing these parts I then assembled the unit again to test and plugged it in and turned it on, it started charging up but as soon as the relay switched into the on position the circuit tripped going straight into “Check” mode suggesting an error, I have double and triple check all of my joints and and component placement and found nothing, I now suspect there may be another component damaged but I’m not sure, is there any info you can give me to aid my search for the source of the issue?
Thanks in advance!
Sorry, but this is really difficult to troubleshoot with being able to check your circuit.
This forum does not allow picture uploads
If you can provide LINKS (e.g. by using a free online picture base) to HI-RES and SHARP pics of your assembly (both solder- and component side)
then we can take a look and provide some feedback.
If we don’t see something obvious, then we recommend to return the board for inspection/repair.