From Newsgroup: rec.games.pinball
On 2022/07/20 7:08 p.m., Paul wrote:
On 7/19/2022 12:40 AM, John Robertson wrote:
On 2022/07/17 7:37 p.m., Paul wrote:
Picked up a Williams Pennant Fever not too long ago and had a little
time to play around with it today.
When I purchased it, other then some GI turning on, machine did
nothing. Replaced the power supply with another I had sitting around,
have all my voltages, but no life on the MPU. Measured 5V, 12V & -12
on the connector. And 5V at some of the chips. Board has zero battery
damage.
Nothing on the 7 segment display, nothing at the displays (tested
those voltages as well at the power supply had my +100 & -100).
Would the cpu itself cause absolutely nothing to appear working?
Any help appreciated.
Paul
Oh and not that this was a high production game, but I did see it has
proto eproms, which i kinda thought was neat.
Hi Paul,
Are there any LEDs lighting on the MPU board - the one with the
batteries?
If not then I would suspect the power connector to the MPU or at the
power supply first.
Check for 5VDC on the MPU itself before assuming power is actually good.
John :-#)#
John,
Thank you for the reply. Sorry I should have worded things better.
After replacing the power supply (working spare i have), I tested the voltages at the connector of the MPU. I have +5, +12 & -12 there. I also probed a couple of the chips (randomly) on the MPU and had +5 on one of
the corner pins.
There is a 7 segment display on the MPU, it shows nothing. Which is why
I asked if the cpu on the mpu was bad would cause this.
Paul
Hi Paul,
As I recall, even if the CPU is locked up the 7-segment display will
show something - perhaps an "8".
Please check pin 40 of the CPU - that is the /RESET pin. If it is close
to 5VDC then /Reset is High, which is running. If it is close to 0.0VDC,
then /Reset is Low and the CPU can't function. The "/" in front of
"Reset" is the Active state, in other words, Reset is active when Low.
It should only be Low if the 12VDC power is under around 8VDC or
something else is defective. It pulses Low when power is available for
perhaps 1/2 second or less, then goes High to allow the logic board to
get running.
If /Reset is Low, please double check that the CPU has 5VDC present.
Just because power is at the connector wires, doesn't mean it is getting through to the logic board. Connector pins and wires break in
interesting ways...
John :-#)#
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