David O'Dell wrote:

Hey all,

Thanks in advance for any help on this. I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. It is a wavetek brand waveform generator model 75.

the device turns on but the LED display panel is all black blocks and no digits. I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. I have measured the signal from all of the outputs and no response.. I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom.



has anyone had experience with this problem on this or a similar device before?

thanks!
There don't seem to be a service manual up front, I didn't fully look

But what you describe sounds like bad caps, electrolytic types. Most
likely from sitting around and one in a critical area dried out.

Also, that unit could have a lithium cell in it for memory, some times
they get bad enough to where they hold down the start up process of a
diode isn't being used to isolate it.

I would take it apart and look it over..

Jamie