Cleaning disk drive heads and checking arm movement; repaired 5800000 spare card

GIVING THE 2310 DRIVE SOME ATTENTION AS I WAIT FOR PARTS

I am still waiting for the new start capacitor and air filter for the drive, plus waiting on the PCBs and components for the plotter controller card replacement. The drive is still filthy, requiring considerable cleaning before a cartridge would ever be inserted inside. 

I used some wipes and swabs to clean the disk heads. They had a coating of dirt that had to be removed, although the surface of the heads appears to be in good condition. 

The first pass wiped off quite a bit, but after some time I had reduced the dirt on the heads to more normal levels. They are still not clean enough to risk flying on a disk surface, but we will get there. 

First pass with isopropanol cleaning heads

I am a bit concerned that the head loading arms are touching the upper head but leave a sizeable gap to the lower head. Something is awry that must be diagnosed and corrected. 

REPAIRING A SPARES BOX 5800000 CARD

I had a 0000 card in my box of donor cards that I use to pull off components when repairing other cards. I put it on the bench and tested the behavior of the card; one input on one of the six gates was defective.

Each gate is on its own 361451 SLT module, so the repair is simple. Find which module handles the gate with the error, remove the module and put on a spare from another donor card. The work was quickly done and the card now tests out perfectly. It can be used in an 1130 system.