Hello all, this is my 1st post. I'll be brief as to not waste much of your time.
Recently a customer of mine approached me with a "Sanyo Big Ben" boombox stereo.
Here is the symptom I was getting at first. 30 seconds after I turn the unit on (battery powered or wall plug) I hear a noise that I can only describe as a helicopter sound which was overpowering the music coming from any source (FM/AM/CASS).
After cleaning some superficial rust on the battery terminals and hitting the "mode switch" with some contact cleaner the helicopter noise went away.
Now my current issue is that even though the left speaker sounds great, the right speaker has some light distortion which is evident during highs (cymbal crashes and vocals). When I turn the treble all the way DOWN and the bass all the way UP, it results with a very muddy sounding bass.
I have diagnosed that my problem lies in the right channel and not the speaker by swapping the speaker connectors on the pc board.
As far as the VU meter, (when in radio mode) the left needle is stable (at "white -3") while the right needle dances between White -1 and Red +1. When it's in CASS Mode the VU needles dance according to the music but the left is generally lower on the scale than the right (if that extra info helps.
)
My guess is that I either have a leaky cap or transistor somewhere on main board. If anyone could help on this issue I would most appreciate it. Thank you.
Recently a customer of mine approached me with a "Sanyo Big Ben" boombox stereo.
Here is the symptom I was getting at first. 30 seconds after I turn the unit on (battery powered or wall plug) I hear a noise that I can only describe as a helicopter sound which was overpowering the music coming from any source (FM/AM/CASS).
After cleaning some superficial rust on the battery terminals and hitting the "mode switch" with some contact cleaner the helicopter noise went away.
Now my current issue is that even though the left speaker sounds great, the right speaker has some light distortion which is evident during highs (cymbal crashes and vocals). When I turn the treble all the way DOWN and the bass all the way UP, it results with a very muddy sounding bass.
I have diagnosed that my problem lies in the right channel and not the speaker by swapping the speaker connectors on the pc board.
As far as the VU meter, (when in radio mode) the left needle is stable (at "white -3") while the right needle dances between White -1 and Red +1. When it's in CASS Mode the VU needles dance according to the music but the left is generally lower on the scale than the right (if that extra info helps.
)My guess is that I either have a leaky cap or transistor somewhere on main board. If anyone could help on this issue I would most appreciate it. Thank you.
Open to any suggestions.
. Also, good point of flipping the stereo on its side while spraying contact cleaner so simple and effective yet it never occurred to me to try it lol. Many thanks for your help. I'll keep you updated. 