Flash Gordon was working well with one error. On the playfield inserts for the upper playfield bonus, the playfield lamp under the number nine would never turn on and the number ten was locked on and would turn on with the GI.
This morning, i entered the self-test by pressing the button inside the coin door. I had never tried the self-test and wanted to see if it would shed any light on the locked on insert lamp.
I pressed the button and it entered the test. The number nine did not light and the number ten stayed lit and would dim when the playfield lights flashed. I continued through the test and cycled the power.
Now, the alltek mpu self-test light only flashes five times. The playfield and backbox GI are on, but the displays do not come on. When I turn it on, the power on siren sound continues for about a minute and then goes off.
Ive looked up the significance of the five flashes and found this:
Tests the second PIA chip (U11). As above. If you have already swapped U10 and U11 and don't have the fifth flash, try a new 6821 in U11. If still no success, swap once more. Worst case-replace both PIA's.
Tests the Display Interrupt Generator. This actually tests both U11 and U12. If U11 has been replaced, and no sixth flash, replace U12.
Does five flashes mean it is failing the fifth test? Need to replace the U11 chip?
Thanks in advance for reading this.