[joepower]

Hey all,

I'm currently dismatling my TNC145 controller and trying to identify an electronic part. Basically it's mounted on the first board on the top right hand corner. It resembles a fuse in size and shape but has a red graduated scale along it's body, going from zero to ten. Does anyone know what this is ? Haven't seen one before.

I'm currently drawing out a circuit diagram for the board, until I find the fault - Heidenhain only seem to make the block diagrams available - no schematics about ?

Thanks,

Joe

[Mike Woo]

Hi Jo
I would be greatfull of your diagrams when you are done. I am trying to trace a power supply board problem but like you am having trouble getting info on the circuits.
Cheers and good luck.

[jmelson]

Hey all,

I'm currently dismatling my TNC145 controller and trying to identify an electronic part. Basically it's mounted on the first board on the top right hand corner. It resembles a fuse in size and shape but has a red graduated scale along it's body, going from zero to ten. Does anyone know what this is ? Haven't seen one before.

Joe

I suspect it is a running time meter. They have a glass tube with some electrolyte and mercury in it, and a small current causes the mercury to move from one end to the other of the tube. It will have a resistor in series with it, and be connected across a power supply. If you reverse it, the line will start moving the opposite direction.

Jon

[dreammstr6]

Jon is correct it is a run time counter for the display. Tektronix also uses those on the o-scopes and spectrum analyzers for service purposes.