Galaxy
Stern Electronics, 1980tp1 - 5.12
tp5-5.15
tp6-12.65
tp4-85mv
tp2-14.2
tp3-23.3
those are the numbers off the mpu. game was working great. had a party where the pin was on for 12 plus hours and it died. any help is greatly appreciated.
thanks
blake
Are you getting any flashes on the MPU? If so how many?
http://pinwiki.com/wiki/index.php?title=Bally/Stern#MPU_boot_issues
For $21 the MPU-200 NVRAM adapter is a no brainer. It gets the flakey memory out of the way for troubleshooting.
http://nvram.weebly.com/
If you're getting 3 flashes swap U10 and U11 PIAs and see if the behavior changes. If you get a forth flash you will know a PIA failed.
Quoted from Superchicken:For $21 the MPU-200 NVRAM adapter is a no brainer. It gets the flakey memory out of the way for troubleshooting.
http://nvram.weebly.com/
If you're getting 3 flashes swap U10 and U11 PIAs and see if the behavior changes. If you get a forth flash you will know a PIA failed.
cool i will try that tomorrow. i think i have some ics that i never used in my last mpu repair.
thanks
blake
Quoted from vid1900:You get one quick flash, then the rest.
How many flashes are you gettin?
two flashes.
thanks
blake
Quoted from Superchicken:For $21 the MPU-200 NVRAM adapter is a no brainer. It gets the flakey memory out of the way for troubleshooting.
http://nvram.weebly.com/
If you're getting 3 flashes swap U10 and U11 PIAs and see if the behavior changes. If you get a forth flash you will know a PIA failed.
so i swapped U10 and U11 and it booted with 4 tones but a solid LED. i turned it off and on and it booted all the way allowing me to start a game but ends up restarting after 10 seconds. led flashed inconsistant to the tones and stayed dim but on until reboot. bad PIA??
thanks
blake
6820 is the obsolete part. It looks like Action Pinball has some PIAs:
http://www.actionpinball.com/parts.php?item=6821
I would still get rid of the 5101 and swap in NVRAM. The RAMTROM chip is a lot more stable and makes the battery go away.
Blake, as far as testing a 5101... or your 6821s. If you'll be repairing a good amount of machines, you'll want to grab the Neoloch Inquisitor with SRAM & PIA blades. http://www.neoloch.com/products/Inquisitor.php If you can solder, you can buy it as DIY kits. Takes a bit of time to put together, but well worth it with being able to verify if SRAM or PIA ICs are good/bad.
Quoted from Superchicken:6820 is the obsolete part. It looks like Action Pinball has some PIAs:
http://www.actionpinball.com/parts.php?item=6821
I would still get rid of the 5101 and swap in NVRAM. The RAMTROM chip is a lot more stable and makes the battery go away.
yea i will place the order and grab the nvram at the same time.
thanks again for the help
blake
Quoted from acebathound:Blake, as far as testing a 5101... or your 6821s. If you'll be repairing a good amount of machines, you'll want to grab the Neoloch Inquisitor with SRAM & PIA blades. http://www.neoloch.com/products/Inquisitor.php If you can solder, you can buy it as DIY kits. Takes a bit of time to put together, but well worth it with being able to verify if SRAM or PIA ICs are good/bad.
sounds like a good idea. soldering is no problem. i appreciate the info.
thanks
blake
If desoldering is no problem replace the spring sockets with machine sockets while you're at it. It is easy to make things worst if you haven't worked on 30 year old boards.
Quoted from Superchicken:If desoldering is no problem replace the spring sockets with machine sockets while you're at it. It is easy to make things worst if you haven't worked on 30 year old boards.
ok ill look into it.
thanks
blake
Quoted from eh97ac:If you buy the NVRAM, same site has 6821's
weebly is out of the 6821's.
thanks
blake
Quoted from Blake:i need the mpu-200 adapter that replaces both U8 and U13 correct? the single will not suffice.
thanks
blake
Correct
I suspect a 5V supply problem is causing your reboot issue. Wiggle MPU connector J4, if that makes it reboot repin the connector and replace the header. If not, time to check the SDB.
Quoted from dothedoo:I suspect a 5V supply problem is causing your reboot issue. Wiggle MPU connector J4, if that makes it reboot repin the connector and replace the header. If not, time to check the SDB.
ill give that a shot.
thanks
blake
i received the nvram and 6821 ic's today. after installing the nvram first no change. then the 6821 ic's and it booted right up. game is fully functioning. i did a lot pf work on the rf board in the bottom of the cab so gi lighting is perfect. nice to have scores saving too. thank you to everyone for your help. im playing some PINBALL!!
thanks
blake
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Vergennes, VT
Sana'a
Toronto, ON