H and V synch on a 25" Nanao MS8-26SU

[RetroJames]

I have this 25" Nanao MS8-26SU monitor I am attempting to use in a new MAME cabinet and planned to use it with an Act Labs lightgun with an ArcadeVGA.

I just saw this note on Andy's site -

==============================

The Act-Labs USB gun works but there are some factors to bear in mind. The
gun will only work if the H and V sync are not connected together. The H and
V signals must both be connected to the monitor.

==============================

The connector I have uses 5 of the 6 pins in the connector as follows:

R
G
B
GND
Synch (H and V)

Looking on the chassis, see attached, I see 6 pins but it is unclear if the 6th can be used in such a way that would "split" the synchs

R
G
B
GND
H or V synch
V or H synch

I need to find out if the synch can or is split between these pins so the act labs gun will work.

Finding a Nanao schematic or manual is near impossible and I am hoping someone here has the answer. Thanks in advance for any assitance you can provide!

[Orclord]

Well this might not help a lot.....

I have a Nanao MS9-29SU...Manufactured in 96....Just taken the back off the cab and that connector on mine is R-G-B-GND-H-V...I only have 5 wires connected as well.

I tried to get a photo but it's too dark and I thought waving my camera around in the back was not a good idea...seeing as the lens cap snagged on a few cables....

The schematics I have are not for this monitor

 

[RetroJames]

I guess I may need to look on the underside of the chassis PCB.

[grantspain]

My take on this issue is you only have one sinc input so you can't attach two seperate sincs,but why does that light gun require both sincs connected-i mean my arcade has many gun games which only have one sinc connected,is there something different about the act labs gun that it uses both sincs as its trace

[RetroJames]

Not sure, it may be a requirement of the ArcadeVGA, not the gun.  Anyway, here is the answer from Jomac in Au. I am told he is the go-to-guy for Nanao monitors and he came through here:

"Hi James ,

The Comp H-Sync input on the chassis means it will accept a signal from a
game that is producing a composite negative sync , if however you are not
supplying this pin with a composite sync you need to also connect the V-sync
pin .
Basically Composite is a combination of the V and H , but as you are not
going to be supplying the chassis with a combination you can use the H and V
pins separately as you need without any modification to the chassis.
Just remember the both V and H and Negative Sync

1:Red
2:Green
3:Blue
4:Gnd
5 H Sync
6 V Sync

Let me know if this works ok for you James ,

Regards,
Joe McNicol ( Jomac )"

http://www.jomac.net.au