Usually the dividing / summing resistors cause issues. These split the output of the driver stage to the multiple PA modules, then merge them together.
Check for burnt or discolored components. You may have to pull things apart to get to the resistors. I think they're mounted underneath the circuit boards. Also check and resolder ALL the omega strips, even if they look good. Taking meter readings will tell you which PA module is failing, but it won't tell you if it's loss of input power or the module itself. Everything works at 50 ohms so you can try swapping modules and see if the trouble follows the module (module bad) or stays with one position (divider or summing network resistor bad). Bob M. ====== --- On Sun, 4/5/09, mdnosliw <[email protected]> wrote: > From: mdnosliw <[email protected]> > Subject: [Repeater-Builder] Msf5000/ TLE1452A amp problems > To: [email protected] > Date: Sunday, April 5, 2009, 6:37 PM > Anyone have any experience > troubleshooting these amps. I have one where one stage fails > after about 10 minutes. Still will make about 75 watts. > > Out of three of these amps I find that the third stage > always seems out of balance with the other two. > > Are there common parts on these that fail or is my only > option to replace the stripline assembly. > > Thanks > Mark > KB1IOZ
