Magnum S9 Repair Help

[9C1Driver]

Ok so I ended up buying this on the forum late last year.

https://www.worldwidedx.com/threads/magnum-s9-for-sale.235741/

When I finally had time to mess with it the display is all janked up. Here are some still shots but it just shifts around but you never know what channel your on. A local tech seems to think a cap or some other part has gone bad but he does not know enough about these radio's. Here are the pics. Anyone have an idea on what's up? Kinda wish I would have passed on this one but we will see I guess.

 

[TheRealPorkchop]

Does it receive on frequency? Does it transmit on frequency even though the display is janky?

If I remember correctly there were two versions of that frequency counter display board. It also controls the channel display and I believe the frequency’s themselves. The only place to get one now is Avera Distributing way over the pond and they’re expensive. That is, if they even have any left, I might have grabbed the last of them, don’t remember.

It could be as simple as replacing capacitors, it’s certainly at the age that it wouldn’t hurt.

 

[9C1Driver]

If seems to receive, I never keyed it up because I never knew what channel I was on. For sure was a bad purchase, needs way way more work then a simple frequency alignment.

 

[2315 Robert]

If seems to receive, I never keyed it up because I never knew what channel I was on. For sure was a bad purchase, needs way way more work then a simple frequency alignment.

TX into a dummy load low power.and monitor. Does the frequency stay stable with no mod(external freq counter)? Look for cold solder joints. Heat(what is not shiny for sure crystal legs) and beat(gently rap on the chassis with a soft handled driver) will fix that radio. If I am wrong feel free to smote me.

 

[Robb]

http://www.cbtricks.com/radios/rflimited/magnum_s9/graphics/magnum_s9_sch.pdf

Look at the MCU board and all of its connection headers to see if they are wonky somehow; partially unplugged, broken, etc.
Best place to start.

 

[2315 Robert]

Start with what Robb said,

 

[Handy Andy]

The main PCB is essentially a Galaxy style board - note the L6 coil being unshielded serves as that reminder.

But all functions are handled thru the MCU - a tough egg to crack...

When the internal Frequency counter - being a stand alone - works like that - ouch.

 

[2315 Robert]

9C1 what did you try? or can I have it for 5 bucks plus shipping?

 

[9C1Driver]

Right now on E-Bay the last several working S9 radio's sold for $472,$311,$439, and $311. If I do dump it I will try and get $100 for it and take the loss. If that don't happen I will have it fixed at some point or keep it for parts.