What's new
By:

Sega blast city ms9-2930 - 31khz doesn’t seems to work

V

vesta03

Beginner
Joined
Sep 26, 2024
Messages
31
Reaction score
4
Location
france
hello team,

i have an issue with my manual blast city combo ms9-2930. the 15khz works well with a great image but once i switch from 15khz (D switch OFF ON OFF) to a 31khz pcb and D switch OFF OFF OFF i can heat the switch but i also have a black screen. sound of the game is ok.

it seems that my 31khz doesn’t work or i miss something here…

is there anything i can check to troubleshoot ?

thanks in advance for your help ! ;)
 
Hi fist of the north star from a recalbox rgb jamma. the source is sent in 480p then when i switch the 2nd D switch to off to move to 31khz i have the sounds but no image… if the game is set to be displayed in 15khz there is no problem.
 
You cant. You need to route to the dsub connection. Jamma edge can still be used for i/o though. This is how a real atomiswave is setup in a blast.
 
are your sure ? it seems that d switch 3 have 2 positions 1 is for the dp15 and the other is for the amp connector
 
i can’t with my pcb module (recalbox rgb jamma) which use jamma connector for 15 and 31khz games
 
the screen is recognize by my pc but i have nothing displayed (screen resolution set to 480p 60hz
 
just to be clear it’s a manual remote control , honestly i dont’t know about the hh31 , i’ll check
 
You normally do not need to touch that horizontal hold pot. But you would if you had a scrambled screen. If its black it means nothing is coming in - in this scenario which is lack of an input from the db15 connector
 
ok so you confirm that the 31khz is not displayed from the jamma. i’m loking for the hh31pot now i can’t find any scheme…
 
You must log in or register to reply here.
Back
Top