I have a Galaxy 99 that when I first turn it on the frequency just keeps rolling until it gets warm and then it will stay on frequency. Can this be fixed and is it a difficult repair?
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Galaxy 99 Frequency roll
- Thread starter darango360
- Start date
Mine is the same way , but I don't use it much . When I do I just let it " Set A While 
" . I heard before a lot of Galaxy's are noted for this ?
" . I heard before a lot of Galaxy's are noted for this ?
If I recall.... isn't that from a surface mount resistor in the freq counter box that is too small wattage wise to drop the supply voltage to the counter box? The factory resistor gets really hot because it can not dissipate the heat well. I think Mike's radio repair did a video on it on youtube with the cause and repair.
I may be wrong on that tho. Could be a crystal problem or cold solder joints. Depending on how old the unit is, may be the corrosive glue of death bunnies eating away at components and starting short/conduct or open circiut.
I have a old 99V here that I re-capped but it does the freq counter roll also. Lightly pressing on the main PCB around the PLL/VCO area with a non-conductive pokey stick calms it back down. Time to re-flow some solder joints!
Just some ideas on where to look. YMMV. Good luck!
I may be wrong on that tho. Could be a crystal problem or cold solder joints. Depending on how old the unit is, may be the corrosive glue of death bunnies eating away at components and starting short/conduct or open circiut.
I have a old 99V here that I re-capped but it does the freq counter roll also. Lightly pressing on the main PCB around the PLL/VCO area with a non-conductive pokey stick calms it back down. Time to re-flow some solder joints!
Just some ideas on where to look. YMMV. Good luck!
I would start by setting the radio to channel 20 and starting at band "A" to see if it locks back onto a stable channel frequency. If it does, go to band "B", and so on up to "H".
If it won't lock on any of them, it's not simply an adjustment.
If it locks on some bands but not on others when it's cold this could be a problem with the setting of the slug in the VCO coil.
That's where we start, if it's not just a soldering fault .
Pressing/tapping lightly on the solder side of the board with an insulated tool handle will reveal trouble with a solder connection, if that's the root of it.
More than one fault can cause the PLL to unlock and show you the 'roll' on the counter display.
More than one kind of fault can produce that symptom.
73
If it won't lock on any of them, it's not simply an adjustment.
If it locks on some bands but not on others when it's cold this could be a problem with the setting of the slug in the VCO coil.
That's where we start, if it's not just a soldering fault .
Pressing/tapping lightly on the solder side of the board with an insulated tool handle will reveal trouble with a solder connection, if that's the root of it.
More than one fault can cause the PLL to unlock and show you the 'roll' on the counter display.
More than one kind of fault can produce that symptom.
73