To measure AC in yellow cables I will have to unscrew the pcbs as access is difficult
Apologies again, I have not worked on the CR-1000.
If it makes it easier, you can also measure the AC by placing one probe on FR801 (either side) and the other probe on FR802.
Maybe measure the transistor first. The AC "must" be ok as it's straight from the transformer.
btw what is the role of the white cable also coming from transformer next to 2 yellows?
The white wire is used for grounding. Hopefully you are looking at the schematic.
Meanwhile I also have one unit dead (another CR-1000), it doesn't start up, no lights on etc. I wonder if I could have killed it somehow measuring the voltages.
I will check if you have another thread on the CR, so I can read what has been tried, however, if the amp looks dead the power supply is a good place to start.
On Power/relay board measure dc voltage at +50, +33, -50, +12, -12
If all +50, +33, -50 are dead then it could be an AC supply issue(yellow wires), however low probability or the rectifier D801,2 (also low prob) or failed components or bad connections
to components. Candidates for failure are FR801,2,3,4 and the transistors. Resistors can go open, also many bad solder connections.
You measured the AC voltage between the 2 red wires as 74V. Measure the dc voltage at the +B (orange wire) and -B(white) also on the power board.
Expect about 50Vdc.
If power is OK, you could try running the CR as a seperate using the PRE-OUT/MAIN-IN into another amp.