John Bennett
Senior Member
[ukvac] Tech : JAMMA Cab - Further Info.
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 (ziggy@stardust.force9.co.uk)
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 (ziggy@stardust.force9.co.uk)