well, my UHF MSF died.
here's the specifics...
analog C74CLB series...
TX/RX lock green
TEST steady red
station will not key with the front panel toggle switch.
upon reset (i.e. unplug it) ...
test LED blinking at a strange rate...no pattern...and station still will not key up.
over the previous 2 weeks, station did this twice before..first time a front panel reset did the trick, the second time a hard reset (unplug) did it...now it's DOA.
ideas?
please don't say "new station control board"...i know it's more than likely a logic problem!
doug
MSF 5000 repeater problems.... ho hum
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TheMotorolaMan
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Doug
On SCM check 5 volt line with an scope for any ripple(high freq),should be flat line. Ripple causes the watchdog reset circuit to keep micro resetting hence test led stays on.
As I remember, look for 1000 uf cap(3 legs) near metal case for 5 volt switching regulator.
If 5 volts is ok,and you have access to another MSF try subbing Program Prom.
TMM
On SCM check 5 volt line with an scope for any ripple(high freq),should be flat line. Ripple causes the watchdog reset circuit to keep micro resetting hence test led stays on.
As I remember, look for 1000 uf cap(3 legs) near metal case for 5 volt switching regulator.
If 5 volts is ok,and you have access to another MSF try subbing Program Prom.
TMM