Hello,
I have just accuierd a new bass guitar amp. It has 2 inputs (for an active and a passive bass guitar - one is louder than the other) de passive input does not work.
When measuring on the pins of the printboard with my scope, i noticed that on the pin of the input jack there is signal, but on the pin of the connector to the pre amp there is none. I reverted the setup and put signal on the cable coming from the pre amp and now I measure signal on the pin of that connector but no signal on the pin coming from the jack.
I resoldered both pins. But this did not help.
On the same route there is a 10pf cap going to gnd. Disconnected that one, but it did not have any effect.
Since there is just about 10mm of printboard in between both pins i highly doubt the printboard itself is defect.
The active input has the same setup, but does not show this behaviour and isnon the same printboard. Signal passes trough perfectly.
Does anybody have an idea what is going on? Or what I can test?
Br
Jeroen
I have just accuierd a new bass guitar amp. It has 2 inputs (for an active and a passive bass guitar - one is louder than the other) de passive input does not work.
When measuring on the pins of the printboard with my scope, i noticed that on the pin of the input jack there is signal, but on the pin of the connector to the pre amp there is none. I reverted the setup and put signal on the cable coming from the pre amp and now I measure signal on the pin of that connector but no signal on the pin coming from the jack.
I resoldered both pins. But this did not help.
On the same route there is a 10pf cap going to gnd. Disconnected that one, but it did not have any effect.
Since there is just about 10mm of printboard in between both pins i highly doubt the printboard itself is defect.
The active input has the same setup, but does not show this behaviour and isnon the same printboard. Signal passes trough perfectly.
Does anybody have an idea what is going on? Or what I can test?
Br
Jeroen