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Mastr III problems

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Salisbury, NC
I have a Mastr III and the RX Synthesizer has a fault light flashing. Went through the service manual and found I needed to adjust the VCO to get 2-7VDC on pin A23. However when I do so there is no change in the voltage no matter how much I change the pot for the VCO. I did try this card in another chassis and the voltage will adjust to the proper level however once I have done this and put it back in the other one the voltage still has not changed. It looks like something further up the chain is the problem. Has anyone had a similar issue or problem.
 

ElroyJetson

I AM NOT YOUR TECH SUPPPORT.
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Sep 8, 2002
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DO NOT ASK ME FOR HELP PROGRAMMING YOUR RADIO. NO.
There's a fair number of MASTR III cards on fleabay right now. And even complete repeaters going for less than what that card should be worth.

I think your card needs to be "repaired" by an "experienced technician". Probably cheaper to pick up a spare from fleabay as previously mentioned.
 

commercialradio

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Nov 21, 2013
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Location
Terre Haute,Indiana
Hi,
Did the station work and then ceased to function or is this something that you are trying to reprogram with a new personality?

The VCO locking is frequency dependent, you haven't fat fingered channel number or tried to program a channel way out in left field?

Try putting the cards from good station in the troubled unit to see if the back plane is ok. Swap the system modules, that is where the program lives.
 
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