here's an update on my two problems: distorted picture and coin-up issue!
i also had a posting on KLOV about the picture distortion and dokert told me that the problem lies in the horizontal sync and that i should look for the horizontal hold potentiometer. it's one of those potentiometers NOT
located directly on the back side of the chassis, therefore i didn't know about its existence, but once i found and turned it i got a perfectly centered picture without distortion! thx dokert!!!
tick!!! on to problem 2 ...
Strangely enough some boards (bootlegs?) seem to have a freeplay setting on DIP Switch C7, wouldn't hurt to check that.
i've tried it, but i don't have one of those boards with a freeplay dip switch - damn! would have been too easy.
Maybe try pin 11, this is supposed to be the service switch.
before i tried what sascha suggested, i had checked the voltages directly on the board and not on the edge connector and realized that they were too low. only +4.75 volts! cranked up the voltages on the switcher to +5.10 in the hopes of solving my coin-up issue, but unfortunately nothing had changed!
so i did as sascha had suggested and shorted pin 1 (ground) with pin 11 (service switch) and guess what ...
click on the following picture to hear the sounds of the jungle:arrow:
ok, what does that mean? i cannot add credits via the coin switches, i cannot add credits by shorting two points on the edge connector, but i can add credits via shorting the service switch! if you ask me, something has to be wrong with the board ... what do you