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Picked up a 2980WX with the (EPT-690010C board). The radio was functional BEFORE a main board recap was performed. After the recap, the radio would go into tx as soon as you powered it up. The frequency counter reads correctly but no channel display and no meter lamps. What I found was C112 has...

Well, I soldered in a brand new YD1022. As soon as I turned the radio on, the audio IC smoked. I then removed that and installed a TA7222AP. I now have modulation. This is a AUG 03 build. Just wanted everyone to know if they ever ran into this situation. The audio circuit has not been modified.

Wow, never thought of that one. I appreciate ya 999. Going to have to see if I have a YD1022. Lucky I asked..lol. thanks again!

Just picked up a really nice Earnhardt edition that is missing its 10 pin audio IC. What comes in this model a TA7222AP or a KIA7217AP ? Anybody know for sure?

Thanks. Found a discontinuity between power switch and pin 9 on the relay.

I replaced all caps. Measured all resistors values, combiner and splitter are ok both visually and value. I'm just not getting the DC at the transformers and meter bulb not illuminating. I'm guessing the relay is switching the DC bias to power the entire bias circuit? Just looking at where it's...

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I had a friend drop off a Texas Star DX-500V for me to look at. The problem I found was the power trace that runs on the underside the front switches of the PCB was blown. I repaired that and the amplifier now turns on. I then proceeded to manually key the amp. The relay keys but the meter lamp...

Yes, sir

PLL is in lock. Radio transmits right on frequency.

Found an issue with IC1 pin 9. I'm supposed to have 2.32v on that pin and I'm only seeing 25mV. All other pin voltages are correct except pin 9. I'm going to order a new quad op amp an plug that in. Dr_DX..D16, D17 functional. Chris Lawrence....No, no white noise at all. Like I said...

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I have a 959 that transmits and modulates fine. PA works. Problem is no sound on rx until it's a S-9 signal. Meter works fine just can't hear any sound until the signal is S-9 or above. Squelch control works. RF gain works. I thought it was something in the squelch circuit, but everything looks...

I'm using X1 setting. I believe your correct on the probe loading down that part of the circuit. It's evident on IC3 pin 4 as well. My counter toggles when I depress the mic and I momentarily see the frequency displayed before it returns to zero. These readings are from a working unit that I'm...

Chris, the radio does receive. L23 was peaked in the working radio before it was removed. I figured it would be close enough to fire up that way when installed. Andy, I measured IC 3 pins. Was missing 10.240MHz on Pin 4 giving no output on Pin 9. All voltages on IC 3 are correct . Something must...

I have looked at this Cobra 29LTD. I found the problem at L23 (tx & 2nd IF peaking). I have my 10.24MHz going into L23, but do not have it coming out to go to pin 4 of IC3. I removed L23 and it has checked out ok. I pulled a L23 from a working 29 and soldered it into the radio I'm repairing. I...

SUCCESS!!!!! S9 signal being injected and reading S9 on the meter. I traced it back from Pin 5 IC1 and found C29 defective. Thank you for all your support in fixing this issue.

Pin 4 shows 9.1v in AM, FM and PA.

I have voltages on troubled Connex...it's just not enough voltage. D6, D7, D8, D10, D11, D12 are reading voltages but those voltages are too low compared to the working units measured. I also have .610v on the outside leg of VR1 on the working unit with a signal injected, yet that voltage is...

So after reviewing measurements, the only things that stand out to me are voltages from IC 1 with a generated S9 signal injected. Nominal voltages obtained from IC1 are what they are supposed to be. Pins 5,6,7 voltages are low compared to 2 other EPT360014B boards under the same test. Also, pins...