Hello to all on the site, I did a search and didnt find a similar issue on these amps to consider. Eq on the SVT 4 pro quit passing a signal.
My SVT 4 pro developed an issue last night and I am looking for some guidance if anyone has experience with the 4Pro. I love my SVTs but this one is solid state and a new one for me.
Problem: The graphic eq selector S4 does not allow eq signal to pass when the eq selector switch is engaged during normal operation.
Indications: I do have an eq LED lamp illuminated when the switch is engaged, however no signal is heard from the speakers. With the eq switch de selected, Eq lamp is extinguished and the non eq signal sounds normal and it appears that all is operating properly albeit without eq. engage the eq... all is quiet like crickets.
So far I have determined that both power amps function normally, bridged or stereo,the pre amp delivers good signals to the power amp and to the pre out and tuner out jacks, all the tone shaping circuits function normally in addition to the bright , ultra hi, ultra lo selectors, mute functions normally. I plugged in an external pre amp to the power amp in jacks and they function normally. I don't have a foot switch to test that function on the rear panel. the rear jacks appear clean upon inspection.
After looking at the schematics found elsewhere in the site.. a big thanks to that post for the pdf files, I
I opened the cabinet and removed the cable between the equalizer board and the preamp board. The amp operated normally with the eq interface cable disconnected.
My questions are: It seems that S4 is functioning normally, Does it control the throughput? or is the switch or some part of that circuit pulling the signal to ground? ( Eq LED lamp comes on with power applied to the eq board?) any ideas about where to have a look to see where the signal is being cut off? Or does S4 supply power to the eq board ? Im wondering if the signal is diverted or is the power to the board being interrupted?
Is the issue on the eq board or more likely on the preamp board in the vicinity of S4?
any help or guidance regarding the circuits of this amp would be a big help, Im kind of rusty in the op amp arena and this schematic Im looking at is a challenge for me ..
thanks for the consideration in advance.. I certainly would appreciate the feedback.
My SVT 4 pro developed an issue last night and I am looking for some guidance if anyone has experience with the 4Pro. I love my SVTs but this one is solid state and a new one for me.
Problem: The graphic eq selector S4 does not allow eq signal to pass when the eq selector switch is engaged during normal operation.
Indications: I do have an eq LED lamp illuminated when the switch is engaged, however no signal is heard from the speakers. With the eq switch de selected, Eq lamp is extinguished and the non eq signal sounds normal and it appears that all is operating properly albeit without eq. engage the eq... all is quiet like crickets.
So far I have determined that both power amps function normally, bridged or stereo,the pre amp delivers good signals to the power amp and to the pre out and tuner out jacks, all the tone shaping circuits function normally in addition to the bright , ultra hi, ultra lo selectors, mute functions normally. I plugged in an external pre amp to the power amp in jacks and they function normally. I don't have a foot switch to test that function on the rear panel. the rear jacks appear clean upon inspection.
After looking at the schematics found elsewhere in the site.. a big thanks to that post for the pdf files, I
I opened the cabinet and removed the cable between the equalizer board and the preamp board. The amp operated normally with the eq interface cable disconnected.
My questions are: It seems that S4 is functioning normally, Does it control the throughput? or is the switch or some part of that circuit pulling the signal to ground? ( Eq LED lamp comes on with power applied to the eq board?) any ideas about where to have a look to see where the signal is being cut off? Or does S4 supply power to the eq board ? Im wondering if the signal is diverted or is the power to the board being interrupted?
Is the issue on the eq board or more likely on the preamp board in the vicinity of S4?
any help or guidance regarding the circuits of this amp would be a big help, Im kind of rusty in the op amp arena and this schematic Im looking at is a challenge for me ..
thanks for the consideration in advance.. I certainly would appreciate the feedback.
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