(Topic ID: 132476)

Freddy's Nightmare Issues

By WonkoTSane

8 years ago


Topic Heartbeat

Topic Stats

  • 13 posts
  • 6 Pinsiders participating
  • Latest reply 6 years ago by Newbie979
  • Topic is favorited by 2 Pinsiders

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#4 8 years ago

When you change the battery on a Sys3 MPU you *must* reset to factory settings otherwise the machine will nit work properly.

viperrwk

#6 8 years ago

When the RAM contents get corrupted on a Sys3 (usually because of either a bad battery, a DS1210 failure or bad RAM itself) the types of things seen in the video will happen.

Power the machine on, hit the reset button on the MPU board, install the factory settings, power cycle. If the settings don't stick and the problem remains, there's a problem with the battery/watchdog/RAM. If you don't have/know how to use Marco's test ROM to further isolate the problem start with a new battery.

This also assumes you have the 5v adjusted correctly at the power supply.

viperrwk

1 week later
#9 8 years ago

Before you go jumping at U11, there are other things to do/check.

After powering on, press the reset button on the MPU board and check its functioning.

Perform a factory reset if you have not done so. As previously stated, this is *essential* after changing the battery. It is pointless to do anything else after changing the battery unless this is done first.

Check for corrosion around U6 (below the battery).

Then there's this around U11:

https://pinside.com/pinball/forum/topic/cue-ball-wizard-boots-if-you-switch-onoff-3-times#post-2319562

U11 is the last thing I would change before looking at the other components.

viperrwk

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