I am not a tech, nut just a guy who has restored a 64s to 99%.
You might want to check your Head Voltages. Each head has 2 voltages (LR)
Write down the voltages for each head and then verify and or adjust for the Maint Menu.
The machine I restored had voltages all out of whack and I think that was due to the previous 2 owners changing heads and not entering the correct voltages.
These days in general I do not let the printer run its head cleaning. I clean the caps and move the heads to the wiper station, and with a lint free saturated towel I am able to slide my hand and towel under the carriage and clean the heads. If an one head has any clogged jets I simply hold the towel in place for a minute, and that clears it up.
I also keep an eye on the position of the capping station, because if I have learned anything about these machines the capping station is a religion.
Hi there, I honestly appreciate your experience on the machine and you wanting to share with co-travelers . I newly acquired one of this machines .kindly send me your email address , in case I need to learn one quick thing from you . Regards , Raymond