sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems San-Bar Power Supply (San/Bar 6640-301)

After some 25 year our old key phone (6 button)gave up the ghost. We replaced the Q1 (Tip34) Motorola Power Transistor, but still have no 24 VDC on pin 2 of the output plug. It looks like the 2nd Transistors is also gone. We only have a electrical drawing for a 6610-301 and not the 6640 therefore it is difficult to check Voltages on the various test points.
Does any one repair this?
Or does someone have a replacement for purchase.
We can post a picture if needed.

Is the transformer putting anything out?

Any update Hans?

Start at the xfmer primary and work your way forward. Do you have a schematic?

Please post a picture. I just tossed one of these out but might be able to retrieve it.

Grim:

Will you please contact me via PM or e-mail? Thanks!