Hi guys,

I am looking for some help please in identifying a couple devices used 
across an RS422 communications line on a board.

Ther's a photo here  ... http://imagebin.ca/view/UJfdCKe.html

One device goes between one of the RS422 comms line and ground and the 
second one goes between the other comms line and ground.

They look just like resistors, but obviously are not. They have what looks 
like a glass body with painted on rings. A bit like a large 1N4148.

Out of circuit one measures 194 ohm both ways and the other about 35 Meg 
ohms both ways. (no fingers)

I'm assuming they are varistors or transient voltage protectors of some 
sort, but have no idea on values or where to source a suitable replacement

The board got damp and had a fair bit of corrosion around that area.

Just out of interest, the 2R2 smd's that are visible in the photo are 
inductors, not resistors. You'd think manufacturers could come up with some 
markings that weren't so potentially confusing.

Thanks,  Roger 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist