John Bennett
Senior Member
[ukvac] Re: Tech : JAMMA Cab - Further Info.
Sounds like the 12v to me too, most boards only use 12v for the sound
amp, and your coin mech will almost definatly be 12v too. Did the same
thing on my cb connecting up a re-programmed mech, spent hours looking
for the problem until I had the bright idea of checking the fuses !. My
cab had a slow blow fuse on, which had only slightly blown, thus giving
less then 12v, no sound and no coins.
zigg-@stardust.force9.co.uk wrote:
original article:http://www.egroups.com/group/ukvac/?start=2914
>
> Thanks for the advice received so far
> ref. the lack of coin input and sound output
> on my JAMMA Cab.
>
> I have checked the earth connections and there does
> not appear to be a problem there.
>
> I have not yet had chance to check the fuses in the PSU
> but would like to confirm that, everything else works OK, the
> games come up on screen and joystick/buttons are OK. It is
> purely the fac that there is no sound and coins/credits
> are not accepted.
>
> Something else to mention is that each time I reset
> the machine at, when powered back up 1 Credit is automatically
> available for play on several PCBs where normally this
> doesn't happen. This happens on Major Title and Power Spikes
> (naff games I know!)
>
> It is almost as if 1 credit / coin is being registered
> when the power is switched on.
>
> Immediately before this problem occurred, I had ben changing
> the Major Title PCB for the Power Spikes PCB. Upon first power
> up with the Power Spikes PCB installed, no display came up
> and a high pitched whining noise was emitted from the cabinet.
>
> I detached and carefully re-attached the JAMMA connector
> and it powered up OK after that but without sound and
> coin input. These 2 PCBs have since been tested in my
> other, older JAMMA cabinet and they work fine in every respect
> so the PCBs are not damaged.
>
> Is it possible that by mis-aligining the JAMMA connector
> I could have caused this problem? Unfortunately there is a
> small amount of leeway when connecting which in its worst case
> could have led to each pin being connected to the one adjacent
> to its proper position e.g. PCB Pin 5 being attached to Jamma
> connector Pin 4.
>
> Sorry to ramble on, I'm just hoping that this info. may
> shed further light on the problem.
>
> Thanks Again
>
>
> Jason Howle
>
>
------------------------------------------------------------------------
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DATA Imported from archives: originally posted by (david_reeves76@hotmail.com)
Sounds like the 12v to me too, most boards only use 12v for the sound
amp, and your coin mech will almost definatly be 12v too. Did the same
thing on my cb connecting up a re-programmed mech, spent hours looking
for the problem until I had the bright idea of checking the fuses !. My
cab had a slow blow fuse on, which had only slightly blown, thus giving
less then 12v, no sound and no coins.
zigg-@stardust.force9.co.uk wrote:
original article:http://www.egroups.com/group/ukvac/?start=2914
>
> Thanks for the advice received so far
> ref. the lack of coin input and sound output
> on my JAMMA Cab.
>
> I have checked the earth connections and there does
> not appear to be a problem there.
>
> I have not yet had chance to check the fuses in the PSU
> but would like to confirm that, everything else works OK, the
> games come up on screen and joystick/buttons are OK. It is
> purely the fac that there is no sound and coins/credits
> are not accepted.
>
> Something else to mention is that each time I reset
> the machine at, when powered back up 1 Credit is automatically
> available for play on several PCBs where normally this
> doesn't happen. This happens on Major Title and Power Spikes
> (naff games I know!)
>
> It is almost as if 1 credit / coin is being registered
> when the power is switched on.
>
> Immediately before this problem occurred, I had ben changing
> the Major Title PCB for the Power Spikes PCB. Upon first power
> up with the Power Spikes PCB installed, no display came up
> and a high pitched whining noise was emitted from the cabinet.
>
> I detached and carefully re-attached the JAMMA connector
> and it powered up OK after that but without sound and
> coin input. These 2 PCBs have since been tested in my
> other, older JAMMA cabinet and they work fine in every respect
> so the PCBs are not damaged.
>
> Is it possible that by mis-aligining the JAMMA connector
> I could have caused this problem? Unfortunately there is a
> small amount of leeway when connecting which in its worst case
> could have led to each pin being connected to the one adjacent
> to its proper position e.g. PCB Pin 5 being attached to Jamma
> connector Pin 4.
>
> Sorry to ramble on, I'm just hoping that this info. may
> shed further light on the problem.
>
> Thanks Again
>
>
> Jason Howle
>
>
------------------------------------------------------------------------
Java or juggling?. Everybody learns something at Learn2.com. Where
you'll find thousands of free 2torials, affordable online courses, and
useful tips for everyday life. http://clickhere.egroups.com/click/964
eGroups.com home: http://www.egroups.com/group/ukvac
http://www.egroups.com - Simplifying group communications
DATA Imported from archives: originally posted by (david_reeves76@hotmail.com)