Problem: Tascam M2600 MKII console is not passing a signal. When I hook a noise generator to the input, nothing happens. I do get 48V (or just under) out of the mic inputs as expected. I’m thinking it might be a power supply problem.
- Check the integrity of the cable from power supply to console. Result: Its electrically good. Plug it back in. The end going into the power supply is a little loose when connected to the box.
- Check voltage output of the power supply. This is a 15 pin cable. Thankfully, the user manual has the output pin assignments. Result: +5, +48 are fine, +-20 is not. I don’t have an elegant way to measure the voltage. The Multimeter probes are too big for the 15-pin cable. I have to improvise with paper clips, being extremely careful not to short out the supply and blow something else!
- Open the hood. The W2 Fuse looks suspicious. Continuity test: Fuse fails.
- Replace fuse. I don’t have a 4A 250 volt 5x20mm package, slow-blow fuse so I insert a 2A fuse for a quick test. It works.
Time to order the correct fuse. I suspect the power supply cable was stressed enough to almost break it, and in the process, the 20V supply shorted out and blew the fuse. The evidence does point in that direction with a partially broken connector. Either that or Pruis Hall was really rockin’.