Hi
I have been asked by a friend to repair a pair of ROKIT 8 powered speakers,
He paid hundreds of pounds for these,and left them in the loft for afew months ,but we found that they had been ruined by damp on the boards,
I am slowly bringing them back to life, replacing damaged and corroded components,
And of course a good drying out. And are back working.
I should add that as a hobbyist I’m a little out of my depth.
I am now struggling with a loudish pop which comes from both lf and hf speakers on switch on, this is the same on both cabs.
Each cab comprises two boards-a preamp board (which looks undamaged) and the main output amp board /rectifier etc
Little info available, but A very similar schematic is here-(at bottom).
http://music-electronics-forum.com/attachments/33751d1430277257-svparts_rp6g2scha1.pdf
The output amp is two separate amp circuits- TDA2052 for the HF and aTDA7294 for the LF. the amplifer using the internal mute circuits for start up mute,
And fed from what I assume is the delay circuit on the (undamaged?) preamp board- UP3B to pin 6 on the multiblock,which then splits to the amp chips, i have tried interchanging boards- no difference.
the pop is on both LF and HF cones.
also after being powered off for a few days, the speakers take some minutes before audio is heard, i dont know if this is related.
if I cut the mute wire- no start up pop.
Logic would suggest (an unlikely?). fault on the UP3B delay circuit, but am I barking up the wrong tree?,
THANK YOU
DOUG
I have been asked by a friend to repair a pair of ROKIT 8 powered speakers,
He paid hundreds of pounds for these,and left them in the loft for afew months ,but we found that they had been ruined by damp on the boards,
I am slowly bringing them back to life, replacing damaged and corroded components,
And of course a good drying out. And are back working.
I should add that as a hobbyist I’m a little out of my depth.
I am now struggling with a loudish pop which comes from both lf and hf speakers on switch on, this is the same on both cabs.
Each cab comprises two boards-a preamp board (which looks undamaged) and the main output amp board /rectifier etc
Little info available, but A very similar schematic is here-(at bottom).
http://music-electronics-forum.com/attachments/33751d1430277257-svparts_rp6g2scha1.pdf
The output amp is two separate amp circuits- TDA2052 for the HF and aTDA7294 for the LF. the amplifer using the internal mute circuits for start up mute,
And fed from what I assume is the delay circuit on the (undamaged?) preamp board- UP3B to pin 6 on the multiblock,which then splits to the amp chips, i have tried interchanging boards- no difference.
the pop is on both LF and HF cones.
also after being powered off for a few days, the speakers take some minutes before audio is heard, i dont know if this is related.
if I cut the mute wire- no start up pop.
Logic would suggest (an unlikely?). fault on the UP3B delay circuit, but am I barking up the wrong tree?,
THANK YOU
DOUG
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