I got a DX 7 from a friend, and he got a problem with it. It was many years ago on a gig. The DX was connected to a wall mounted power supply socket with a variable
voltage. In Norway it is 220V. But perhaps it was as low as 100V. Well,the problem started then.
" REPLACE BATTERY "
I’m not a hi tec.with electronics but i have a friend who are. This is what we’ve done
so far : 1 Replaced battery with a CR 2032
2 Checked power supply, every thing is ok, both voltage is ok.
3 Checked diode D4 is ok.
4 Replaced new ic’s nr. 20 and 21. Think this is the Ram chip’s. It was after
talking to a guy who ment thoose were the problems.
But still the " REPLACE BATTERY " shows when i turn the synth on.
I haven’t checked the IC nr.19. it has the same nr. as no.20 and 21 but i don’t know
what that IC is doing.
Is there anybody there to help me solve this problem i’ll be very thankful