Galaxy 2517

[smoke blower]

I found spraying freeze spray on the audio chip the issue stopped so I put in a brand new audio chip now I have no sound at all. the radio is transmitting fine good audio and the meter is moving on receive just no sound also noticed the pa doesn't work even tried a external speaker but no sound at all even when I touch the pins on the audio chip no sound at all

[sonoma]

are you sure the chip you put in there is good. you need to look at the caps right there tied to the audio chip. one of them may be what took the chip out.
after reading your info again its confusing. you say the radio is TX good and good audio out then you say now no audio. do you mean no RX audio or what are you saying here.
what is the voltage on the board also.

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[smoke blower]

Ok I replaced C175 and c 179 and yeah these were new I got from my provider. I thought if the audio chip was bad there would be no audio on transmit or can it be

[smoke blower]

no audio on receive or pa only. audio I have on transmit only. and I have 14v on the board

[sonoma]

OK you know your problem is at the audio chip area. have you checked to see if the chip is getting warm, have you verified the insulator is working so it does not short to the case. verify all the caps are soldered good by turning the radio on and rocking the caps to see if all are making good connection. I was talking to my buddy and he gets long winded and hard to get off the phone with him. you can have TX and RX depending on what it bad.
a few years ago he got some bad chips and would not have RX as yours is. make sure you have not slopped some solder and all the legs are where they should be and soldered good.if all is good and the chip is not getting warm you need to verify the chip is good. you may need to put another one in or if you have a old cobra 29 put the chip in it to see if it works. you know where your problem is now you just have to look until you find the problem.

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[sonoma]

I just tried to call you after I left the post but no answer.

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[sonoma]

check the voltages of your chip to ic8 of this chart. not the same board but should be able to use the voltage for your 7222 IC from this chart.

http://www.cbtricks.com/radio ... _chart.htm

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[sonoma]

did you have to work again today? I keep checking to see if you ever came back on here. pin one should be towards the front of the radio when you check the voltages. at least from memory it mounts backwards with the writing towards the case. it has been years since I worked on a radio with this chip in it.

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[smoke blower]

I just sent you a email sonoma

[sonoma]

since the power supply is putting out 22 volts you need to disable it and hook up an external supply to see what you still have working. you may have knocked the new chip out you put in the radio also/

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[smoke blower]

ok I will do that

[smoke blower]

ok I did that and no receive so it must have blown the audio chip again I have another one here I can replace it real quick

[sonoma]

check the voltage at the legs of the chip with the link I left you yesterday. also before you change a part power the radio down and leave the switch on so all residual power bleeds off the caps just to be safe

[ Post made via Linux Laptop ]

[smoke blower]

ok pin 1=13.8 2=2.2v 3=0v 4=0v 5=1.10v 6=1.10v 7=2.20v 8= 2.20v 9=2.20v 10=13.8 so it looks like 2, 7,8.9 are wrong

[sonoma]

I would go ahead and change it to see what it does. before you do check to see if it is getting warm then compare it when you put the new one in.

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[sonoma]

I will be off here for a while, I have to take care of my wife.

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[smoke blower]

ok yeah I got to go to I will get with you later I got to order a new chip the last one I had wasn't the right one and I don't have a radio to get one out of so

[sonoma]

you might try the old one since it was still working before you pulled it out.

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[smoke blower]

Ok Sonoma I will and thanks for your help I will put the other back in tomorrow sometime and let you know

[ Post made via Android ]

[sonoma]

you will need to fix the power supply also. you might look at putting a switching power supply in it.do not know what size you need but it should not cost much to put one in it if the trans inside the power supply is bad you might get by with that.

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[sonoma]

here is a trans failure for the power supply.

http://www.cbtricks.com/cgi-b ... s=1&key=97

hjere is a little more info, go to cbtricks and look at the symptoms and cures section.
http://www.cbtricks.com/cgi-b ... s=1&key=82

http://www.galaxyradios.com/regulator.html

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[smoke blower]

Hey Sonoma I had a chance to put the old audio chip in and it is recieving​ but it is real low the TALKBACK and Pa doesn't work.I took the voltages on the audio chip.
1=13.4v. 2=7.38v. 3=ov 4= 0v 5= 1.21v 6=1.21 v 7=0v 8= 0v 9= 6.90v 10= 14.30v

[ Post made via Android ]

[smoke blower]

The voltages are close but not exactly what they should be on pin-1 and pin-2. I don't have anymore time to work on it today but I wanted to let you know what I have now.

[ Post made via Android ]

[sonoma]

well since you have low audio now on the radio on RX. pin 10 and pin 9 are the feed to the speaker out put. i would say the chip is bad and you need a good 7222 and change c175 again to make sure it did not take a dump since you had 22 volts in it.c175 is a 10 volt which you need to make sure you change those out . one other cap and I will have to check the schematic for it. C179 is a 330uf cap so change it also since it feeds the speaker. you might even try a c179 before you change the 7222 out just to see what it does. you can look close at the power supply info I sent you and order parts for it. the trans more than likely went out in the power supply area and you are getting the full 22 volts off the transformer.

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[sonoma]

make sure you do not power up the supply on the radio until you get the power supply fixed.. 22 volts is a killer.

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