Power supply advice

[drbible]

Hi, Basic question which I know is probably covered elsewhere. I am about to hook up power to some classic pcb's that I have had for decades. I think everything is ready but just want to check some power stuff before I switch anything on.
I have a suzohapp power supply. Is it correct that I just supply this from the mains with any old UK plug and wire that I have stripped such as an old PC plug or kettle lead? Also do I leave the 12v, 5v and -5v all connected via the jamma harness or should I be disconnecting some depending on the board I am using? Lastly what do I do with the dial at the top as I am not using a supergun so have no indication of voltage?
Many Thanks in advance.

 

[qjuk]

Firstly, make sure the SuzoHapp power supply is set to the correct mains voltage (230v for the UK and not 115v - jumper is underneath the PSU).

Secondly, yes you can power the PSU directly to the mains using a cut off kettle/PC lead. Brown wire on main cable is wired to AC/L, Blue wire to AC/N and the Green/Yellow to the Ground symbol terminal.

Thirdly, yes leave the 12v, 5v and -5v connected to the Jamma wiring. If the PCB doesn’t need any of the voltages then that pin won’t be connected at the edge connector so it will be ignored.

Fourthly, the dial at the top is the +5v adjustment. I would fully advise you get a multimeter to check the voltage on the 5v as you could kill a pcb if the voltage is too high. Turn the dial voltage right down (should anti-clockwise) before powering up a board, put test probe on the +5v and GND pins to read the voltage and slowly turn up the voltage knob to reach 5v. As a general rule, voltage should generally be set to pretty much dead on 5 volts. However some boards require more power (especially bootleg pcbs) so you might have to up the voltage a bit for the board to run properly. As a general rule, you shouldn’t go over +5.25v as it can start to kill components. However some boards do require a bit more juice so you might have to go slightly over this. If in doubt ask on the forum here if you think a certain pcb needs more voltage to double check before potentially killing it.

 

[drbible]

Great thanks for the info. So, first time I switched it on the power supply red light lit up and the whole thing buzzing. The CGA to VGA board was buzzing too and it didn't look right so I switched it all off.
I've switched it on again and all much quieter however there is no voltage on any of the outputs. The AC voltage in is 240v but I'm getting nothing from any of the 5v or 12v terminals. Any ideas??? I could try another jamma adapter I guess.

 

[drbible]

Ok scrap that - it must have been the pcb. I've just plugged in another (yie ar kung fu) and it works fine. Any ideas what to try with the other pcb? It's a ghouls n ghosts bootleg. My last one is a GnG original which I'll try now......better work. 2 out of 3 is OK I guess.