Centipede sync problems?

[rchadd]

seems i am having problems with the the monitor sync on my restored centipede machine http://forum.arcadecontrols.com/index.php?topic=36900.0

tried to test it for the first time today but could not get the monitor to sync

i tried to adjust the pots on the hantarex remote control board but it just would not make the screen stable

any ideas what is going on here?

i tested the monitor when the cab was wired for jamma with a jamma board and it synced perfectly without need for any adjustment of the remote control.

could there be a problem with the centipede wiring harness or even the game board?

i would appreciate any advice?

[SuperGunGuru]

I glanced at the centipede manual and it uses a horizontal and a vertical sync. Does the monitor use 2 seperate sync lines or just 1 composite sync? If it uses one, try hooking up both sync wires from the centipede harness to the single sync wire going to the monitor.

[rchadd]

the monitor is hantarex MTC9000 i think

it has VS and HS connections on the monitor - i wired both up to the harness

then i thought i might have got VS and HS around the wrong way but when i reveresed the connections it still looked same

beginning to wondering if there is any sync at all getting from the centipede board to the monitor.

[Ken Layton]

Some Centipede cabinets had TWO video/sync harnesses installed. One was for the pinout of a Matsushita monitor and the other harness was for the conventional Electrohome G07 monitor.

I'm pretty sure a Hantarex monitor is NOT ORIGINAL to the Centipede cabinet. Try running just the horizontal sync wire.

[rchadd]

it is definitely not an original monitor.

someone elsewhere mentioned that it might need to change monitor between +/- sync

could this be the cause that neither sync wires seem to be doing anything?

then again the monitor worked ok with a Hyper Olympics board + jamma converter when the monitor was wired upto a jamma harness.

how does sync output of centipede and hyper olympics compare? is one +sync and the other -sync?


anyone have a link to MTC9000 free docs?

i think there should be a jumper somewhere to switch from +sync to -sync on the the monitor chassis.

[rchadd]

found load of free schematics here

http://www.mikesarcade.com/arcade/monitors.html

[cw]

the composite sync is pin 12 on the centipede board off of the 12 pin connector. run that to your composite in.....

[rchadd]

fixed it simply by switching the monitor form negative to positive sync (there is a toggle switch on the chassis pcb)

[TurboC--]

Those pictures are pretty.