That would have helped greatly!!! I found the issue earlier though. I used Bob's article on the RB site about using the MSF-5k without the PA: http://www.repeater-builder.com/motorola/msf/msf5000-without-pa.html
This gave me power out of the LLA. (About 16W) It was pretty easy to figure it out from there - if there's power going to the PA and nothing coming out... Problem is in the PA!! Opened the PA and found a burned trace. Flowed it with solder, plugged the station in and the same trace vaporized again. It turns out the coupling capacitor between the final driver stage and the load balancer shorted out!! Replaced it with one scavenged from a Micor and all works well. Thanks for all those that helped me in my quest. I'll print this new procedure and put it in my manual for future reference. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 ve7fet wrote: > Hi Scott, > > Finally got to dig out my MSF manuals for a look. > > Looking on the schematic, I see JU1 and JU2 being related to the HSR (High > Speed Ring) data bus. If this is the JU1 you moved, then it would change the > communication path between the SSCB and the TTRC and/or the SECURE board(s). > > That likely explains the crash on boot when it can't find the modules its > looking for since it can no longer talk to them. > > > Here is what my manual (68P81082E20-A) says about Power Control Servicing: > > When servicing the station, it may be necessary to override the power control > circuits to key the station. While this service mode is enabled, SSCB > requests to key the transmitter will disregard and power control failure > indications. > > To enable this mode, depress and hold the SELECT/SET switch in the SET > position (display cursor should not be active at this time). While holding > the SET switch, press and hold the PL DIS/XMIT switch in the XMIT position. > > When tSt appears in the Status display, release the SET switch first, and > then the XMIT switch (station will key after the SET switch is released and > until XMIT is released). > > While this mode is active, the DISABLE LED will flash. Toggle the RESET > switch to take the station out of the Power Control Service Mode. The DISABLE > LED should stop flashing. > > > Cheers! > > Lee > > --- In Repeater-Builder@yahoogroups.com, Scott Zimmerman <n3...@...> wrote: >> This station was working as a station before it went dead. In other >> words, "no, it's not hacked up." >> >> Can anyone tell me for sure where the service jumper - JU1 is. I found >> 'a' JU1 on the SSCB board, but it seems relatively hidden for a service >> jumper. Also, when I move it's position I get an error on the LED >> display, then the station resets. >> >> Scott >> >> Scott Zimmerman >> Amateur Radio Call N3XCC >> 474 Barnett Road >> Boswell, PA 15531 >> >> > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
