Owner acquired knowingly non-working off a friend of a friend, so no
point in asking him/them what is normal operation. Nothing about the
following test routine? in the user manual
Reported as ok for practise use but will not switch into high-power gig
mode.
I've not got inside yet to monitor power rails/ try use dummy loads etc.
Low level test signal in, the output jumps to a high level soon after
switch on, plus bargraph surge, for half a second and then drops back to
low level. Is this normal, just checking-out +/-40V to +/-90V switching
of rails is ok? If so why the bargraph jump?