On 8/26/07 4:13 PM, in article
, "Dan Stephen"
wrote:

I have a Hung Chan 6502 20MHz cro that is proving rather difficult to
repair. Apparently it is also known as a Protek 6502.

The fault is that the trace is only just visible with the brightness on
full. This one has me baffled.

Any advice would be greatly appreciated.

Cheers,

Dan

I'm not at all familiar with that scope, but....... Do you have access to
the crt cathode, aka Z axis, control? Maybe you have a link, jumper, or
other Z axis option mis-set.