I received this machine from my neighbor who wanted it checked by a technician.
The complaints was machine has no response from
the inputs keys, Non was working.
I did some voltage testing and everything looked good.
check the small circuit board which control the inputs.
this circuit was not easy since the manufacturer decided not to make it
accessible easily, no screws or hooks, just used the hot melt glue to fix the
unfortunate considering the customers has invested quite substantial amount of
money but the quality was poor as you can see below.
Once the small input module was out of the machine I again did some scanning and I noted a resistor with one leg broken right at the resistor body and therefore soldering it back together was not possible.
replaced it with another resistor with the same value which I got from my
resistor repair kit.
More scanning revealed break on the pcb track and I sorted the broken track with a wire jumper as you see below.