(Topic ID: 314659)

AS-2518-35 Boots on Bench but not in machine

By JethroP

3 months ago



Topic Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 3 months ago by JethroP
  • No one calls this topic a favorite

You

Linked Games

#1 3 months ago

Have MPU that boots fine on the bench but only a flicker (LED) in the machine. Have all correct voltages in the machine and have 5V and 12V on the MPU board in the machine. Why would it not boot fine in the machine with the correct voltages on the MPU but fine on the bench? The board is jumpered for 2732 ROMs and they are new.

#2 3 months ago
Quoted from JethroP:

The board is jumpered for 2732 ROMs and they are new.

The EPROMs are likely the problem. The EPROMs haven't been programmed deep enough. It causes an issue in-game because the 5V power-supply from the solenoid driver board is usually around 5.2 volts while your bench power-supply is probably around 5.0 volts. That little voltage difference causes issues with borderline programmed cells in the EPROM returning wrong info resulting in the ROM test failing. So you need to write the EPROMs with a longer cycle.

#3 3 months ago

Thank you Quench. I never would have figured out what was up with that. The vendor is providing a new set of ROM's being programmed with the information you provided.

#4 3 months ago
Quoted from JethroP:

Thank you Quench. I never would have figured out what was up with that. The vendor is providing a new set of ROM's being programmed with the information you provided.

They need to use the slowest programming algorithm (and enable double write if their programmer is a GQ-4X) for these old EPROMs. This issue has come up a few times over the past few years.

1 week later
#5 3 months ago

Got the replacement EPROMS today. Installed and all working now. Thanks Quench!

Promoted items from the Pinside Marketplace
From: $ 170.00
$ 8.00
Electronics
Third Coast Pinball
$ 149.95
Boards
Allteksystems
$ 18.95
Eproms
Pinballrom
From: $ 45.00
$ 22.50
From: $ 33.00
Gameroom - Decorations
Rocket City Pinball
From: $ 170.00

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, become a Pinside+ member!