I have the manual right here, but no scanner. The jumper settings are described as follows:
"For an older Denise, close the Denise jumper and the CLIP jumper. For an ECS Denise, open both these jumpers."
There is no troubleshooting section, but there is an erratum to the manual included. It reads as follows:
"The jumper labeled CLIP [...] works the opposite way it is described [in the manual]. When the jumper is open, clipping occurs so that you get a clean display with the older Denise. When the jumper is closed, clipping is disabled so that you get a little extra space with the new Denise.
The jumper labeled Denise [...] has been changed to a variable resistor that may need to be adjusted for different Denise chips."
I have had some problems with a badly seated ffv and/or Denise chip.
Hope this helps...
Also, the bypass switch disables the ffv2 so you can display SuperHiRes through the ffv2 port, but of course the monitor must be capable of a 15.75 KHz horizontal scan rate.
