HP-82104A Card Reader Repair Questions

[Papymouzot]

Photo of both readers inside

Left the 2548S, right the 2052S

Sorry, I could not find how to insert a photo



Edit: I ran other tests on the motor units, if I hold the card when it goes through the reader, both motors go to 350mA when stalled, it seems that the clutches are not doing their job...

Edit 2: I "repaired" the "clutch" in between the motor axis and the worm gear on my very first Card reader serial # 2040S. (The fourth one, which was actually the very first I purchased in 1980) The motor turns fine, no strange noise, quite silent actually, the card goes through ok, but this one gives me a Malfunction message.... A shame, I really would like this one to be working, I am sentimentally attached to it.

Your advice on what could be attempted to repair these three card readers would be greatly welcomed !

Charles