ms PacMan PCB Diag Help

Arcade Collecting > Restorations & repair

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TheMythTheLegend:
Got it. So it could be the diode d9 or that trans at q6.

I think its a diode.

ed12:
ok if u are on ?
u say u have a multi meter.
set it to ac volts
and do a readout at the secondary side of your power transformer (at the fuses) that lead to the wire harness that leads to the ms pacman board
lets see if we have ac power there first before we blame diodes/transistors etc
so set to ac volts and chk on the jama interface (power in pins)
#c and 3 and d and 4 so c and d or 3 and 4 should give u 14 volts ac
then c and a should give u 7 volts ac
these to are the low voltage ac in for the 5v system
so we chk them first
them we move on to the high power 1's (16volt) which is your 12 volt feed

ed

TheMythTheLegend:
Hey ed. Sorry if I was not clear. But im working on a second board. My main ms pac is working in my cabinet. Which I needed to check on the voltages because the pcb that is working has some burn on the edge connector. Game still works. But I hear a hum and have "screen hum bars"...

Had this thing a week. First arcade, bare with me on this.

I have a fluke 115.

Let me get you the cabinet voltages

On fuse block getting 12.43, 12.31, 7.28, & 7.18 im losing .05 on the 7vac lines across the fuseblock.

Also.... The damned ground is cut inside the cabinet...

Shouldn't this pacman be grounded through the socket?

ed12:
ok
there important to know
take your time
i am off to bed

ed

TheMythTheLegend:

--- End quote ---

That image is to what I have seen across my 4 pacman boards. Good is the working board in my cabinet. M16 is the one I am working on currently, pcman and 585 are next to be worked on but the 10k caps are blown on them.... (Buldging inflated like a puffer fish).

From my own testing I am seeing that on the m16 board. D6 is WAY above my working board number .552 to .616. And D9 .104 working to .120 thats .016 higher or 16 thousandth higher. Also the r53 4ohm at 10w. Is up to 4.8ohm highest of the 4 but only 1tenth of an ohm higher than the working board.

I would have to check the tolerances of the components tomarrow.

I ran out of time tonight working on the cab. Add another 3 hrs... So 6 hrs about total time now...

So thank you Ed for the help, I am really trying to include as much as I can. As I appericiate the help.

Tomarrow I will check the voltages at the harness.

That damned thing is original and very hard to handle.... This seems to be a pretty origial cab. I am going to replace the broken t-molding tho...

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