You can test the erase LED while still installed in the machine. However, I recommend to first remove the Erase LED assembly. Then reassemble the drum in the machine. Next, cheat the top cover interlock switch, and place the machine into diagnostics, then run 09-66. This turns the eraser LED on. I usually hold the LED assembly and gently shake it as vibration will often uncover the weaknesses in the assembly. If a section turns off, flashes, or does not light at all, you know what to do. Otherwise, I leave the LED on until the timer function turns the assembly off.
I suspect in your case that you have a bad LED assembly from how you describe a concentration of developer in the center. If you would like to purchase an LED assembly, drop me a note
cbyrne@goevergreen.net
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