Galaxy 66 frequency problem

[Cheech]

I have a galaxy 66 I'm having trouble with. When you turn the radio on the frequency counter shows 25mhz or so and it starts jumping through the frequencies.

I replaced the 10.240mhz crystal and it worked for a short time. I started going through the alignment procedure and half way through it started again. I replaced capacitor 82 per galaxy tech notes I found on cb tricks. It said if the crystal keeps blowing replace c82. I did that and replaced the crystal again and its still all over the place.

Im lost! Ive looked for cold solder joints etc but it all looks good.

 

[Robb]

Since you have replaced the xtal and C82; did you put a freq counter back on that xtal and see if it is 10.240mhz and stable.
If so and it is stable; then check to VCO voltage next.

 

[Cheech]

Its not stable. It shows less than 10.240mhz and every once in awhile it will lock right on 10.240.

 

[Robb]

Then either the PLL is bad, or the voltage feed to it is unstable.
Check to VCO voltage FIRST, then check your voltage regulator.
Check all solder joints around the pll, VCO, loops osc, and 10.240 osc with some touch-up solder..
The pll and to 10.240 xtal are tied directly to each other, as the pll uses that xtal as a reference.

 

[Cheech]

I was thinking it might be the pll chip. voltages seem stable

 

[Cheech]

Changed the PLL chip. Turned on the radio and it seemed fine. Had other things to do so I shut it off and disconnected it. Come back to finish it up and tried it again and its still all over frequency. Checked the frequency at the one pin on the pll chip and its showing 10.24? There has got to be something obvious Im missing here but Im not sure what?

 

[Sideways]

Changed the PLL chip. Turned on the radio and it seemed fine. Had other things to do so I shut it off and disconnected it. Come back to finish it up and tried it again and its still all over frequency. Checked the frequency at the one pin on the pll chip and its showing 10.24? There has got to be something obvious Im missing here but Im not sure what?

Have you checked anything on the band board? I worked on a 44v that was doing the exact same thing, changed a few diodes on the band board and has been fine ever since. Its been a while though and can't remember which ones I changed.
Hope this helps. Good luck

 

[Romyrome]

Well here’s the fix yall been waiting for I won a radio off eBay and it was pretty jacked up but after replacing many parts just to put the radio back to factory and a tuning coil slug was missing as well but the frequency scan issue was solved by replacing the band board . $25 bucks on eBay . Kept the radio on many hrs now and no change she is dead on frequency and stable . Good luck out there yall . Super easy fix and it’s plug and play . 73s from 223 Southern California.

 

[Romyrome]

Well here’s the fix yall been waiting for I won a radio off eBay and it was pretty jacked up but after replacing many parts just to put the radio back to factory and a tuning coil slug was missing as well but the frequency scan issue was solved by replacing the band board . $25 bucks on eBay . Kept the radio on many hrs now and no change she is dead on frequency and stable . Good luck out there yall . Super easy fix and it’s plug and play . 73s from 223 Southern California.