Hi,
I have a DBX 160VU on the bench and I need some help with troubleshooting.
The problem is that as soon as the ratio is other than 1:1 there's no output.
Even with no signal at the input the "ABOVE" LED is bright.
While checking voltages the +24V measured +21.6V while the -24V measured -24V.
While tracing the signal I found out that the first half of OA 3 works fine, but there's no signal coming to the first half of OA 4 (after the VCA board.
I disassembled the RMS board and now there's a signal coming from the VCA board.
I tested the components of the RMS board and replaced the ML1458 with a 4558 but as soon as I connected the RMS board the +/- 15V on the RMS boards drops down to +/-11.5V, the "ABOVE" LED is turned on and there's no output.
One more thing is that the RMS schematic shows 6 transistors while on the RMS card there are only 3. I have no idea what is the "domino block" with the 6 holes?
There's a way of testing the RMS board outside the main circuit?
If so, what should I look for?
Other things I should test beside the RMS board?
By the way, I was servicing this unit a year ago and replaced all the electrolitycs and it worked well until this Sunday.
I have a DBX 160VU on the bench and I need some help with troubleshooting.
The problem is that as soon as the ratio is other than 1:1 there's no output.
Even with no signal at the input the "ABOVE" LED is bright.
While checking voltages the +24V measured +21.6V while the -24V measured -24V.
While tracing the signal I found out that the first half of OA 3 works fine, but there's no signal coming to the first half of OA 4 (after the VCA board.
I disassembled the RMS board and now there's a signal coming from the VCA board.
I tested the components of the RMS board and replaced the ML1458 with a 4558 but as soon as I connected the RMS board the +/- 15V on the RMS boards drops down to +/-11.5V, the "ABOVE" LED is turned on and there's no output.
One more thing is that the RMS schematic shows 6 transistors while on the RMS card there are only 3. I have no idea what is the "domino block" with the 6 holes?
There's a way of testing the RMS board outside the main circuit?
If so, what should I look for?
Other things I should test beside the RMS board?
By the way, I was servicing this unit a year ago and replaced all the electrolitycs and it worked well until this Sunday.