fenderer101
New member
Hi there - first post here. I bought a secondhand ready constructed AML ez1081 from eBay a few years ago. It was sold with a fault, no output and having built similar projects before including a GSSL Bus compressor I thought this might be an easy fix.
Sadly it seems to have me beat...At the moment the issue I can't seem to get past is that I have the negative rail voltage present on Pin1 (non inverting input) of the BA338 amplifier section. It looks like some sort of short between the input and rail. The power section looks fine, getting + and - 16v and a regulated 8v or so on the outlet of the voltage regulator but it seem to be an issue in the gain stage side.
I've downloaded the ez1081 colourbook for reference and it has some test points marked on the schematic but it doesn't give any clues at all about what the correct values should be. Currently I have:
TP1 -16v,
TP2 -16v
TP3 +6v
TP4 -15v
TP5 -6V
TP6 +16v
TP7 +16v
Can anybody please give any insight to how to find the fault? Thanks.
Sadly it seems to have me beat...At the moment the issue I can't seem to get past is that I have the negative rail voltage present on Pin1 (non inverting input) of the BA338 amplifier section. It looks like some sort of short between the input and rail. The power section looks fine, getting + and - 16v and a regulated 8v or so on the outlet of the voltage regulator but it seem to be an issue in the gain stage side.
I've downloaded the ez1081 colourbook for reference and it has some test points marked on the schematic but it doesn't give any clues at all about what the correct values should be. Currently I have:
TP1 -16v,
TP2 -16v
TP3 +6v
TP4 -15v
TP5 -6V
TP6 +16v
TP7 +16v
Can anybody please give any insight to how to find the fault? Thanks.
