Hi, I have bought this spring reverb in quite bad condition
It did work for a while but then a power supply capacitor exploded
Replaced the capacitors and powered the unit again
I measured the voltage post rectification I get +/- 45V that are then brought to +/- 15V by a couple of transistors
I have found datasheet for the power transformer and the secondary voltage is rated at 56V CT
It seems to me the secondary voltage on the power transformer is too high and that's what made the cap explode in the first place
I am wondering if the problem might be the unit is 110V version ?? I just assumed it was for 220V but the thing is the unit came without the power cord and there is no label on the back stating the input voltage !
I couldn't find schematics for this unit but I checked the pcb mounted transformer and two terminals are tied together, mains power applied to the other pair. It seems to me the transformer is wired for 220V operation but I really don't know why the voltages post rectification are so high
Hope someone can share light on this so I will avoid another explosion !
It did work for a while but then a power supply capacitor exploded
Replaced the capacitors and powered the unit again
I measured the voltage post rectification I get +/- 45V that are then brought to +/- 15V by a couple of transistors
I have found datasheet for the power transformer and the secondary voltage is rated at 56V CT
It seems to me the secondary voltage on the power transformer is too high and that's what made the cap explode in the first place
I am wondering if the problem might be the unit is 110V version ?? I just assumed it was for 220V but the thing is the unit came without the power cord and there is no label on the back stating the input voltage !
I couldn't find schematics for this unit but I checked the pcb mounted transformer and two terminals are tied together, mains power applied to the other pair. It seems to me the transformer is wired for 220V operation but I really don't know why the voltages post rectification are so high
Hope someone can share light on this so I will avoid another explosion !