Galaxy DX2517 Troubleshooting Help

[Junkyarddog76]

i think your problem lies in the circuit containing Q30, Q31, and Q33.

i know you said you already checked them but any experienced tech will tell you that it's always the thing you're already sure its not.

It takes some doing to get the right info for a situation like this because its a ranger radio and none of their service manuals have voltage charts for the semiconductors.

the good news is that these chassis are all very similar to each other, and luckily with this particular circuit they only changed the part numbers.

so if you go look at a service manual for an old galaxy 99v, you'll find the voltage chart, and then you just have to compare the schematics to cross-reference the part numbers.

im going to bet that you won't read the voltages i post here because your radio is stuck in "both" TX and RX, but it could still help.

so measure the voltages on one of the transistors, and if/when you find that it isn't right, pull that transistor out and test it. you might want to post your testing method here to be sure you're doing it right.

here's what the voltages should be:

Q30 is a 2SA1282 PNP transistor that is an E C B if you look at it facing you.
in RX: E=8.55v C=8.52v B=7.8v
in TX the only voltage that changes is C which should be 0 volts in TX.

Q31 is a 2SC945 NPN transistor and is also an E C B.
in RX: E=0v C=.10v B=.70v
in TX: E=0v C=8v B=0v

(the B might be the opposite on RX and TX as there may be a typo in the info im looking at)

Q33 is a 2SA1282 PNP transistor and is E C B.
(BTW these can a be a bit hard to find these days)

in RX: E=8.55v C=0v B=8.03v
in TX: E=8.55v C=8.37v B=7.75v

i think you're going to find one of these parts shorted and i think its going to be Q33 but that's just a guess.

LC

Got a chance to work on it tonight.
Q30 and Q33 have been changed with transistors from another galaxy that had no switching issues. D71,72,73,59 have been replaced with 3 series 4148 diodes. d70 replaced, Q37 Q55 Q54 have been replaced with parts from rfparts or ica manufacturing or trucks cb sales. Q30,Q33 voltages are identical from left to right the voltages are 9.47, 9.42, 8.73V. Q37 voltages from left to right leg is 12.90,9.80, 13.60. Q35 voltages from left to right are 2v, 12.91v, 12.38v. I analyzed the schematic around those voltages for a bit but have to call it a night. There are some electrolytic capacitors around the q35 q37 ic7 area that I may work on pulling to check and replace tomorrow since I haven't found a problem yet. will hopefully get back on it again tomorrow. Hopefully some of these voltages will give some clues. Also, Q31 and Q35 have been replaced with 2sc1815 transistors out of an assortment from amazon. From what I looked up it said it was a direct replacement for the 2sc945. Hopefully using those aren't a problem. Another voltage I read was 2 volts on the positive lead of D72.