arcade monitor, need help

[steptoe]

Guys

I have an old cab that when i turn it on the screen works but nothing comes up. There is a plug with 5 wires from the chassis to the jamma harness, i assume its to transfere the image from the pcb tp the monitor. I looked up jamma wiring and its says a cable needs to go to No14 on the harness, there is no wire in No14. Got me stuffed, (maybe its a different harness ??)

Any help guys would be great. Thanks

[CheffoJeffo]

A pic would be very helpful.

What game is in the cab ? How many pins ?

If JAMMA, 14 is video ground and is required. If you have 5 video wires coming from the harness, what pins ARE they coming from ?

Cheers

[steptoe]

thanks for the reply

the game is super ranger

these are where the cable are going into the harness

green - L
black - 2
white - m
red - 12
blue - 13

heres some pics

[steptoe]

1 more pic

[spacies]

What chassis do you have?
The bottom photo is the RGB, sync and ground that connect to the Chassis from the game PCB.

[steptoe]

not sure wha tthe chassis is, heres some pics

thanks for ya help

[steptoe]

heres another one

[grantspain]

this pretty straight forward,if its jamma then the following is correct
green to pin n
blue to pin 13
red to pin 12
white(sync) to pin p
black(ground) to pin 14
if you do not have a pin in 14 then remove pin 2 and place in position 14,although i am pretty sure as long as the video ground goes to a ground then that is correct

[steptoe]

could someone confirm where the 5 wires should go into the jamma harness. Above is where they currently are going, but something looks sus.

Any help guys

cheers

step

[steptoe]

Grant

Thanks for the info, ill go have a play, fingers crossed

thanks again guys

[steptoe]

Well,

N had an orange wire coming out of it on the harness, i decided to pull it out and put the green one and put the white one in P, still nothing.

Why would there be a factory set orange wire coming out of N ?.

Im thinking a new harness and another PCB, i bought the one i have apparently in working condition.

I am correct in thinking the monitor works because in comes up ??

once again thanks guys

[grantspain]

if the monitor turns on but you only get a white screen then 99% of the time the fault will be the video in signal missing either caused by wiring/game board/power supply
the other 1% of the time you get this fault is down to monitor set up or blanking problems
i do not like the sound of your jamma connector,you should print off a jamma pinout and then trace all the wires to check to see where they go,and get yourself a cheap multimeter to aid your fault diagnosis

[grantspain]

o.k after going over the post a few times i can see the problem,jamma connectors go from 1 to 28 component side but they do not a to z as such solder side,g/i/o and q are missed out to avoid confusion
so your original wiring you showed is correct,put it back to that and then turn your attention to the power supply
 you should have red at pin 12 with the green directly opposite,blue at pin 13 with the white(sync) opposite and your black(ground can go to pin 2 or pin 14)

[steptoe]

Grant, once again thanks  for ya help.

Im in australia and i noticed the power supply feeding the chassis in selected to 115v, in OZ we use 240v.

If everything in OZ is 240v wouldn't the monitor be 240v as well, unless theres some type of converter in there . Theres a jump in the chassis board, you either put it on 115v or 240v. I got the cab a while ago, maybe the guys mucked around with things.

Once again guys any help would be great.

CHeers

[grantspain]

this is when a multimeter is invaluable,just because you are 240v does'nt mean the machine is.if you put 240v into something set on 115v then you will blow the living poo outta it
normally the voltage will go through a stepdown transformer before going to the monitor/power supply-but that all depends where it was built
so the first thing to do is get a multimeter

[spacies]

Steptoe.

I have yet to come across a monitor chassis/PCB that is 240V.
I am in New Zealand.

Thet are made as 110V standard and the isolating transformer used determines the input and outputs.

Yours is 240 in and 110 out. Perfectly normal.

[steptoe]

cheers guys, thanks for ya help.

Ill ensure i have 115v to monitor, if i have maybe a new chassis is in order. Its a good learning expirence.

You know how monitors can kill because of the charge, with time does the monitor lose all of its charge

[Fozzy The Bear]

You know how monitors can kill because of the charge, with time does the monitor lose all of its charge

NO!!!! Danger Will Robinson!!! 

Never assume that a monitor has lost its charge on the tube or the capacitors. Discharge it properly if you plan to separate the tube from the chassis or if you plan to disconnect the wiring. A monitor can hold a very large charge for years after it was last turned on!!

Just taking a monitor out without separating the tube from the chassis can be done reasonably safely though, as long as you are careful and you don't go poking around in there.

Best Regards,
Julian (Fozzy The Bear)