Hi, Just thought I'd share some info on repairing a defective HP 5065A lamp oven. These ovens can fail either shorted to the oven cylinder or have interwinding shorts. I have repaired three optical units so far with this failure. The original winding was insulated twisted pair wound directly onto the Aluminum oven cylinder. I used teflon insulated heater wire, Pelican P2332ADVFEP.009BL. It is approx. 5 Ohms/ft. and I use a 50 Ohm length doubled and then twisted tightly. This is then wound onto the oven cylinder which is first covered with a single layer of kapton tape. The original thermistor is replaced with a DigiKey 615-1007-ND. The thermistor MUST be surrounded by heat sink compound. I also install a digiKey TO220 100 degree thermal cutout switch for future protection. It is mounted to the top of the lamp assy. using one of the 3 original mounting screws. The thermistor and heater wires are brought out tie wrapped along the original cable and then soldered to the appropriate pins on the db9 connector.
Cheers, Corby _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
