The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

yamiraptor

Well there Mr. timrim I have to give you a big thumbs up on this one. After going through and soldering the board and more of the board with no results. I went at the little boards then got tx and then rx after a few of the other boards. You know you look at them real close with even a 10x eye loope...

yamiraptor

Thanks again timrim. I did a bunch of resolders with no luck so far. I'll do more tomorow. While I was at it I pulled C442,C447,C448,C529 and checked them also. All checked good. Thanks again.

BILL

yamiraptor

Thank you for the reply timrim. I'll go through and check for the bad solder. Is there a certain area that seems to be consistant with this problem? And would you happen to know where I can find the voltages for the audio chip. Thanks again for your help. BILL

yamiraptor

Het there guys I need your help! I have a cobra 18 wx st made in thailand The only other # I can find on the board are (4A1106) and under that # is 401781. The radio has no rx and no tx. Radio turns on,has channel display,rx light is on and when keyed tx light comes on but nothing on the bench meter...

yamiraptor

Hey there Rick! I unsoldered the little protective cover over Ic 10 to check the volts for pin 8 and when I powered it up the channels were back to where they should be. So there must be a cold solder. The volts on pin 8 were 7.43 I think it calls for 7.44 If i'm right. Also is it a must that I put ...

yamiraptor

Thanks for the info Rick. I'll check around on the solder and check the voltage. I'll let you know what I find. Thank you again.

Bill

yamiraptor

Hey there guys! I could use your help again. I have a mirage 99, made in malaysia, EPT360014b. Radio was working fine then turned it on one day and noticed that channel 19 was at 27.180 on the freq. counter. Thought the clarifier was moved but was not. Tried to move the clarifier to the right and it...

yamiraptor

Hello Rick! I went back to scratch and did somemore investigating. Your right I found another solder issue. Everything looks to be in order. Freq. is back also and no more 10khz off on the channels. Audio is back and rx is clear. I'll put it back in the truck and see if it stays stable in the cold. ...

yamiraptor

Hey there Rick! I replaced crystal x2. No change. After pushing around,I found that the 9pin plug that is on the little board with the channel switch was shorting out. I pulled the switch with the board and found out that all 9 solder joints were cracked. resolder all points and the freq. is back on...

yamiraptor

It's D93. It may not look burnt but more than likely it's done. Part # 1n4003 diode. Have a good one.
Bill

yamiraptor

Thanks for the info Rick. I pulled it already but I don't have a 14.010 crystal. I ordered one today so once I get it i'll have to see what happens. I'll let you know how it comes out. Thanks again. Have a great day.
Bill

yamiraptor

I have a mirage 88, made in malaysia, Ept360014B. When this radio is in the house in warm temps. it works fine. But when it is out in a mobile and it's cold. Michigan weather. Channels 1,3,4,6,9,11,12,14,17,19,20,22,25,26,28,30,32,34,36,38,40. Are all off by 10KHZ. Once it warms up in the house they...

yamiraptor

Well Rick you can ignore that last post. I couldn't leave well enough alone. Went back and pulled C48 to check it, the positive side was burnt off, the bottom of the cap was black. Stuck another one in and there she was,( receive) and (audio). Just think almost the last thing to check,and there it w...

yamiraptor

Hey there Rick hope you are doing well! I happen to have another 29 that I had hooked the other speaker to, and it seems to be fine. Speaker also not a problem. I haven't pulled C48 to check it yet. I did pull C44 and a few others with no luck. All good. I've been on this hard for the last few days,...

yamiraptor

Thanks for you help and time Rick. As far as what started this problem I can't tell you. All I know is I got it and I was told the speaker was no good. Easy fix so I thought. All I can tell you is if you turn the volume all the way up and put the speaker by your ear you can here people talk. But it ...

yamiraptor

Funny you should mention that. I did that also last night. Here they are. 1) 13.48 2) 6.47 3) 0.00 4) 0.01 5) 1.15 6) 1.16 7)ground 8)ground 9) 6.68 10) 12.78 Also pulled tr18 and checked that and it was good. Thanks again. Bill

yamiraptor

Hey Rick I got some numbers for you. R65 rx one side 8.63 volt. Other side 1.53 volt tx one side 0.18 volt Other side 0.84 volt R70 rx one side 7.85 volt Other side 7.80 volt tx one side 7.87 volt Other side 7.46 volt tr11 rx squelch min. 0.69, 0.01, 0.00 max. 0.05, 4.26, 0.00 tr12 rx squelch min. 0...

yamiraptor

Hi Rick! Thanks for the help.
tr23 8.50, 12.66, 7.86 volts
tr13 0.00, 0.01, 0.01 volts
tr17 1.53, 1.53, 0.68 volts

I take it tr13 is no good? Thanks again for your help.
Bill

yamiraptor

Well replaced audio chip and c112 still no audio or swing or pa. If you turn the volume all the way up you faintly here talking. I mean faintly. The needle still shows receive just no sound. Well back to the bench. Any other imput would be great. Thanks guys.
Bill

yamiraptor

Hey Rick how you doing? Thank you for the imput. No I did'nt get the audio chip in yet I'm waiting for it to be shipped. Hopefuly tomorrow or the next day. I wish I had new about the 16v I would had ordered those. But once I get it back up and running I can order some 16v and put them in. I had alre...

yamiraptor

Hey there! I had already pulled the audio chip before I read your last post. I still pulled the c112 and checked it. The cap is a 470uf 10v. It showed it was 498uf on the meter. There allowed + or - (20) are'nt they or am I wrong. Just in case I ordered caps and audio chips. Thanks again for the rep...

yamiraptor

Thanks for the reply marveylus 22. I thought the same thing too. I'll change it out and see what happens. Let you know how it worked out. Have a good one. BILL

yamiraptor

Ok guy's I'm in a little pinch here. Cobra 29ltd classic. 1989 philippines. The radio lights up. Has normal meter movement for receive, and keys up at nomal watts. Problem is there's no sound for receive, and when keyed up no audio or swing. Also tried external speaker still no sound. Pluged in spea...

yamiraptor

Greetings! Just wanted to drop a line and give a speacial thanks to Ramblingman Rick Sonoma and Nomadradio for your opionion and insight on this connex. I have very good news to report that after going through alot of the solder joints, there must have been one that I hit that was giving me the issu...

yamiraptor

Thanks for the reply nomadradio! No sir all the wires are ran to the battery and none to the dashboard. The radio never goes out, it stays on and all. Lights work,has power just the rx/tx goes out then comes back on. I also have noticed that the rx sometimes gets quieter then normal for a few minute...

yamiraptor

Thanks ramblingman for the reply!
I think what I'm going to do is put it back on the bench and start reheating the solder joints throughout the radio and go from there. And while i'm at it i'll check L22. Thanks again for you help. Have a good one. BILL

yamiraptor

No the wire is direct to the battery. I just have to keep fishing. Thanks again for the help. Have a good one. BILL

yamiraptor

Thanks for the reply ramblingman. I had thought the same thing too, I had already did that. In fact I got all the switches. Then I had also seen what sonoma had said about the brackets and screws. By the way thank you too sonoma for the reply. I did try that this morning with the screws but it did n...

yamiraptor

Well replaced Ic10 and tr36,37,38 still no help. Works great on the bench, runs all week long with no problems. I put it in the truck and after about 10min. the rx/tr go out for 1 1/2 min. then comes back and works fine after that. I have bounced this thing on the bench,looked for more cold solder b...

yamiraptor

Thanks rick that's the info I needed. Now we'll see what happens. Thanks again! Have a good one. Bill

yamiraptor

Hey there people I need some insight again. On this connex the Ic 10 chip looks like the #is TA7318p but the 8 looks to be fadded and it might be a 0 does anybody no for sure if it is a 8 or 0? And also the tr36 is #A1282 and tr37 # is c945 but I can't find a cross ref. for it. Anyone no where to ge...

yamiraptor

Thanks for your help Rick. I will take a look at what you said and see what comes up. I know it's something stupid I just have to find it. Thanks again.

BILL

yamiraptor

Thanks for the reply Rambling man. Resoldered the 10.240 but no change. Went back through and doubled check for cold solder and found nothing. Is it possibale that one of the transisters is getting bad? Or is it when they go they just get up and quit? Well it's back to the bench. Thanks again. BILL

yamiraptor

I have a connex 3300hp that works just fine then out of nowhere the rx/tx goes out for about a minute, then comes back on. I've looked for cold solder joints but found none. Not to mention that it will not stay dead long enough to get any voltage checks while it's dead. Does anyone know where to che...

yamiraptor

Ok guys! Before I do anything else this is what's up! I had bought 5 meters from 2 different suppliers. All of them seem to be real easy to move the needle side to side just with it in my hand. (All of them). Now before I tried to do any of the suggestions that you had brought up, I thought just for...

yamiraptor

I put a new meter in a president jackson and when I turn it on and key it up the needle swings up but it bounces a couple of times before it stops. And when I unkey, it comes back down but bounces a couple of times before it stopes. It seemes to have alot of easy back and forth swing. Anyway that it...

yamiraptor

Thanks again there Rick! And thanks for the quick response. I hope if I have another problem I can count on you for help. Have a great day.

BILL

yamiraptor

I have a mirage 9900 that the freq. counter works fine then after a few minutes it starts to run up and down the numbers. It wont key up or recieve. If I tap on the radio it will stop and stay on freq. Then after a few minutes it starts again. I'm looking for a cold solder joint. Is there something ...

yamiraptor

Can anybody tell me what the mods. are on the connex 3300 hp-zx, what the limiter is. Thought it was tr32 but that is already gone and it does'nt look like it was ever there. Thanks for any help. WILD BILL

The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

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