On 09/12/2015 15:16, N_Cook wrote:
2 topcode XG marked FETs? on the board, both with 21.7V on and other
pins reasonable looking DC on them, one with corrossion around.
No mention of phantom power in the user manual, I wonder what that is
doing near the input. 9.3V fed onto battery supply line.
2x JRC 14558,IC4 and IC2 that one in corrossion , the other some way
away, 0,8.2V supplies and 6x 5.5V on the other pins.
The corroded one power rails and only 2, pins 3 and 5 commoned at 5.5V
and 4 pins with all sorts of DC and varying somewhat, in effects on or
off mode.
So off with that SMD and a 4558 will go in there and see what happens

Normal function returns for all that Star-Trekky stuff.
4.1V dc (half 8.2V) now on both 4558 pins ins and outs, all 12 such
pins. I'll try and find out how beer got to where it pooled , as not an
obvious landing place.