I need help in troubleshooting my denon pma 520 amplifier that started misbehaving recently.A few weeks prior to malfunction
one channel was playing slightly louder than other and it took quite long for the relay to connect.
What i did was to replace old relay but this didnt help . Now the symptoms are ( and were before relay swap)
1. After turning on relay still takes too much time to click
2. after the click amplifier can either:
a) work properly
b) not engaging source selector light , have fixed volume ( quite loud , overdriving my test speakers) and not responding to volume pot or anything else)
turning the cd direct/subsonic/normal selector can temporarily fix the amp ( or spoil if it was working correctly)
I dont know much about electronics but i have multimeter, esd meter and know how to solder so obviously i can change some components like capacitors etc but need instructions/suggestions how to find faulty ones and where to start.
I attached a link to short youtube video showing the issue.
one channel was playing slightly louder than other and it took quite long for the relay to connect.
What i did was to replace old relay but this didnt help . Now the symptoms are ( and were before relay swap)
1. After turning on relay still takes too much time to click
2. after the click amplifier can either:
a) work properly
b) not engaging source selector light , have fixed volume ( quite loud , overdriving my test speakers) and not responding to volume pot or anything else)
turning the cd direct/subsonic/normal selector can temporarily fix the amp ( or spoil if it was working correctly)
I dont know much about electronics but i have multimeter, esd meter and know how to solder so obviously i can change some components like capacitors etc but need instructions/suggestions how to find faulty ones and where to start.
I attached a link to short youtube video showing the issue.
It looks like you have a problem with the contacts.
Probably the smoke from your barbecue got on the board, switches and volume control. 🙂
You need to wash it all with isopropyl alcohol.
You will feel the difference instantly!
Probably the smoke from your barbecue got on the board, switches and volume control. 🙂
You need to wash it all with isopropyl alcohol.
You will feel the difference instantly!