Homers meltdown problems

jamieh · Post by **jamieh** » Sun May 04, 2008 3:04 pm

Seems to be alot of problems with these machines on here.
Well, guess what? I moved it also and its kinda been outside for a few months (covered of course).
Well, my problem is pretty weird, the PSU is working fine, all LED's are on.
On the MPU, the first 2 LED's do not light (They are the LEDs to show that the machine has not booted and the software is loaded).
But, Last night, i left it on for about 4 hours, and the next morning turned it on and LED 1 was on.. Maybe its the battery in the MPU needed charging? Well i turned it off again and it decided it would break again, so i'd like to ask here. Later today i'll be taking the battery out and testing its voltage, just to see if its at the 3.6v i think needed. If it is i can blame the MPU, otherwise it could just be the battery? Its a bit puzzling because the LED 1 comming on after leaving it on for a while could prove the problem is this. But anyway even if its the MPU, is there any way to tell if my EPROM's are the game or working? I don't have a clue where to get the 4 needed for the game.. if anyone could help, or give advice i'd be grateful, thanks.

aaamusements.co.uk · Post by **aaamusements.co.uk** » Sun May 04, 2008 6:05 pm

1. The psu may be faulty whether the lights are on or not.
2. The battery will not affect operation in this way, unless it has leaked and corroded the tracks on the board (common).
3. It is unlikely that the eproms are at fault.

Alex

jamieh · Post by **jamieh** » Mon May 05, 2008 12:58 am

Thanks for your time. I'll test the PSU tomorrow, if it returns not faulty, i'll most likely get a new MPU and see. I'll come back with my results. Thanks once again!

aaamusements.co.uk · Post by **aaamusements.co.uk** » Mon May 05, 2008 10:39 am

jamieh wrote:Thanks for your time. I'll test the PSU tomorrow, if it returns not faulty, i'll most likely get a new MPU and see. I'll come back with my results. Thanks once again!

No worries.
Just remember these psu's are notorious for humming merrily along and then suddenly dropping, causing the machine to reset.

jamieh · Post by **jamieh** » Mon May 05, 2008 8:40 pm

Hi again, tested the voltage on the PSU, all the needed voltages were there, so i'm assuming its the MPU. Any chance you may have a service manual for the machine? thanks for your help.

aaamusements.co.uk · Post by **aaamusements.co.uk** » Mon May 05, 2008 9:17 pm

jamieh wrote:Hi again, tested the voltage on the PSU, all the needed voltages were there, so i'm assuming its the MPU. Any chance you may have a service manual for the machine? thanks for your help.

It can be found here:

http://www.fruitemu.co.uk/vb/downloads. ... ile&id=438

Any sign of battery corrosion to the mpu?

jamieh · Post by **jamieh** » Mon May 05, 2008 10:24 pm

Thanks for the service manual!

Didn't find any corrosion to the MPU. PSU is working fine and the power LEDs on the MPU says its getting power & the LEDs on the PSU are all lit themselves, plus i've checked the voltage and it appears fine. So i guess I'm going to try get a new epoch MPU as it doesn't boot or load the software. All LED's on other boards are lit so i can only assume that the MPU is the problem. Thanks for all your help, very much appreciated! Keep up your excellent work!

and once again, thank you.

aaamusements.co.uk · Post by **aaamusements.co.uk** » Mon May 05, 2008 11:05 pm

No problem, hope an MPU sorts it; usually plenty to be found on Ebay.