[Repeater-Builder] Re: MSF5k - No Tx
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
Re: [Repeater-Builder] Re: MSF5k - No Tx
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
Re: [Repeater-Builder] Re: MSF5k - No Tx
Lee, Does your manual include a flowchart for Power control servicing? 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
[Repeater-Builder] Re: MSF5k - No Tx
There are some trouble shooting charts... mostly in the PA section itself. For the Power Control, there is a block diagram with explanation notes on its operation. Send me the model number and other particulars via email and we can continue there. Lee --- In Repeater-Builder@yahoogroups.com, Scott Zimmerman n3...@... wrote: Lee, Does your manual include a flowchart for Power control servicing? Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531
[Repeater-Builder] Re: MSF5k - No Tx
Hi Scott, Do you know if the power sense is hooked up/working? I seem to recall having this issue when trying to use a MSF5k with a non-MSF (Micor) PA. Without the forward/reflected power from a VSWR bridge being fed back into the MSF5k, I am pretty sure the shelf did what you describe. Its been a while since I played with one, but hopefully that gets you going in the right direction. Lee --- In Repeater-Builder@yahoogroups.com, Scott Zimmerman n3...@... wrote: OK, It just may be because it's late on a Saturday night, but I am stumped. I have a UHF 100W secure capable MSF5000 that when I key the TX (doesn't matter how of the GOZILLION ways) the 'PA On', 'PA Key' and 'PA Full' LED's light for a split second and then I get no power out. I am testing into my service monitor, so high ref. power is not an issue. I realize that the power control is a loop and I could be chasing my tail trying to figure out which came first - the lack of power or the lack of drive. I read in earlier posts something about JU1 being a service jumper. JU1 in this station is a 3 position header. When I change positions on that jumper, the station doesn't boot properly, gives an error, then resets. I don't think I am looking at the correct JU1. The manual eludes to many troubleshooting charts that apparently aren't in my book. I think that there were MANY authors and they figured that someone else will write that. For those of you that know me and know what I do, I have never worked on anything this new. I'm used to the good ol' fashioned radios, where a strategically placed alligator lead fixed all your power-set ills. Even a look at page xx in the manual for a troubleshooting flowchart type message would be helpful. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531
Re: [Repeater-Builder] Re: MSF5k - No Tx
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 ve7fet wrote: Hi Scott, Do you know if the power sense is hooked up/working? I seem to recall having this issue when trying to use a MSF5k with a non-MSF (Micor) PA. Without the forward/reflected power from a VSWR bridge being fed back into the MSF5k, I am pretty sure the shelf did what you describe. Its been a while since I played with one, but hopefully that gets you going in the right direction. Lee --- In Repeater-Builder@yahoogroups.com, Scott Zimmerman n3...@... wrote: OK, It just may be because it's late on a Saturday night, but I am stumped. I have a UHF 100W secure capable MSF5000 that when I key the TX (doesn't matter how of the GOZILLION ways) the 'PA On', 'PA Key' and 'PA Full' LED's light for a split second and then I get no power out. I am testing into my service monitor, so high ref. power is not an issue. I realize that the power control is a loop and I could be chasing my tail trying to figure out which came first - the lack of power or the lack of drive. I read in earlier posts something about JU1 being a service jumper. JU1 in this station is a 3 position header. When I change positions on that jumper, the station doesn't boot properly, gives an error, then resets. I don't think I am looking at the correct JU1. The manual eludes to many troubleshooting charts that apparently aren't in my book. I think that there were MANY authors and they figured that someone else will write that. For those of you that know me and know what I do, I have never worked on anything this new. I'm used to the good ol' fashioned radios, where a strategically placed alligator lead fixed all your power-set ills. Even a look at page xx in the manual for a troubleshooting flowchart type message would be helpful. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 Yahoo! Groups Links
