I got 2 of these radios both dead, but this one is close, so far I have replaced q54 and tested q55 and got almost a 2 watt carrier 6 pep watts, replaced both finals C2312 (Tested good) with c1969 both good transistors and all biasing diodes including d93 but still nothing also tryed vr10 replacement put nothing vr10 and vr11 are dead???? And help would be Awesome
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Galaxy 2517 biasing adjustments are dead
- Thread starter Justwantdahifiaudio
- Start date
I would never claim that I know what I'm doing, but how would the condition of the caps surrounding the VRs effect them?
Check R243 and R244, both sides, one side should be the 8 volt TX bias when you TX, and the other is the "feed" to VR11 and VR10...respectively
If one of the two - VR 10 or VR11 - are shorted, R243 or R244 would be dead one side but holding 8 volts on the other.
If not, then your TX feeder line needs to be checked...
This may be a D93 "incident" where the Asymod that Galaxy uses - for their "push" of audio drive - check R245 - that is also part of the "Feeder" for TX power...
If one of the two - VR 10 or VR11 - are shorted, R243 or R244 would be dead one side but holding 8 volts on the other.
If not, then your TX feeder line needs to be checked...
This may be a D93 "incident" where the Asymod that Galaxy uses - for their "push" of audio drive - check R245 - that is also part of the "Feeder" for TX power...
Pretty small...
Hmmm...Looks like you have a short somewhere between the pots and the bias diodes they feed...you have microvolts - should show 0.8 to 0.5 VOLTS not the mili-volt stuff...
Yes, that would help for then you can test per HOLE the pot leaves behind...
The above it "colored" to help you locate the possible short...
It wouldn't stand to be unreasonable if the Resistors R243 and R244 may have blown open...
The only way to test that; is to lift one leg and test leg to leg out of circuit...
The above it "colored" to help you locate the possible short...
It wouldn't stand to be unreasonable if the Resistors R243 and R244 may have blown open...
The only way to test that; is to lift one leg and test leg to leg out of circuit...
Ok so pulled both resistors, they tested fine pulled both vr’s think it should be 100 ohm looks like I have up119.2 and down3.29 Boths vrs are fine so that’s looks good... vrs are still out of radio...
Do the following with the
POWER OFF - Disconnected!
Check using the "template" foil pattern above, to help - locate those shorts or what could be pulling the power down...POWER OFF - Disconnected!
Check by noticing the pots "pull power" down their substrate into foil board ground. One lead solders into the pad that the feeder Resistor (R243 or R244) goes to - then a trace goes to R242 and R241 (Respectively) that is 22 ohms - and the Diodes themselves.
So test leads across the Amber (No, not orange or Gold for the Resistor) - to foil Green Ground.
Are the diodes installed correctly - I mean One leg to the "amber" the other to Foil Ground Green on the other side?
Note too, the "grey" right next to the Green Foil by the back panel - those are RF ground to the BACK PANEL - so they are not shorted to ground - should show open.
I have both vrs removed and have continuity through both biases Diods on the finals driver has no continuity? I know I should pull the diodes to test but kinda thought that was weird? I did replaced the diodes in the beginning of this mess,
without the diodes you would have blown the finals right away...
Diodes - if shorted, would keep the finals into class C not Class AB where they're designed to run.
I'm asking you to check - via ohm meter - the ohmic value of the pads to ground - I'm thinking if it's a blown cap - that "Short" would be apparent - to have two blown on opposite sides of the feeders - doesn't occur often. I'm thinking assembly issue and you may have soldered the RF tabs that are RF ground to foil ground in error...
Diodes - if shorted, would keep the finals into class C not Class AB where they're designed to run.
I'm asking you to check - via ohm meter - the ohmic value of the pads to ground - I'm thinking if it's a blown cap - that "Short" would be apparent - to have two blown on opposite sides of the feeders - doesn't occur often. I'm thinking assembly issue and you may have soldered the RF tabs that are RF ground to foil ground in error...