Question about Midland 75-822 40-Channels Handheld CB Radio

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No audio output with internal OR external speaker. Any suggestions? Could it be audio circuit and is this a common problem? Also need schematic for 75-822.

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Re: No audio output with internal OR external speaker....

Unfortunatly this is a common problem. I have found that the mic switch ( PTT Switch ) doesn't always make good comtact internally ( You might spray some contact cleaner in the switch ) and also you might look close at the speaker jack in the radio. It may have broken contacts ( the lead broke loose from the board ). Resolder them and it should work. Good Luck
NC Electronic
Mills, Wyoming

Posted on Jan 07, 2008

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CB Plays out PA Speaker

it is possible that the PA speaker output is intended for a normal (unpowered, unamplified) speaker. Perhaps in your case the audio you hear from the PA speaker is only signal leakage from the PA Speaker connection.
To know.. connect a regular speaker to the PA speaker connector (any speaker, home audio, old car 6x9....). If the PA works and drives the temporary speaker OK, and you hear no CB receive, then the PA output is for a normal speaker, with leakage of CB audio.
It is just a guess, but easy to try.

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I need a schematic for a uniden pc 78 elite cb radio

I will assume you have also looked for the schematic as a Cobra 29ltd which is the same radio----Check the internal speaker with a meter first and also examine the external speaker jack which will cut the inside speaker off.

Lastly a microphone with a broken wire in any area will kill receive audio.

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I have a PC 78XL CB radio and it is on but cant hear nothing ,volume is turn up

Make sure squelch is turned down enough---if meter shows signal and no audio the internal speaker may be bad (plug one into external jack on rear of the radio).

If the radio transmits and shows it (or someone can hear when you xmit) the problem is in the audio circuit of the radio.

Check internal/external speaker AND SWAP THE MIC as a mic with a broken wire inside or open element as well can cause this.

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1 Answer

Meter shows good send & receive strength but no sound from internal or Aux. speaker.

If mic is ruled out (broken connections etc) likely a cap in the audio circuit has opened--this happens a lot when a radio is stored for a long period of time.

Going to need a schematic and a meter to test the caps in the audio circuit--could also be a bad audio chip or connections at it.


Apr 21, 2012 | CB Radios

1 Answer

No audio or static output on ext. speaker

Does the internal speaker work, if yes! the speaker jack is defective or needs cleaning, sub another speaker to be sure. But if there is no audio, there is a small capacitor that will sometimes open near the audio output ic, plus the ic developes a hairline crack in some cases and is heatsinked to the inner chassis.

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The problem is in the audio output chip usually bolted to the inner chassis. Sometimes the chip developes a hairline crack, replacement recommended.

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No audio out of the radio's speaker or external speaker jack, but has audio from the PA jack.

The problem could be a range of things. Generally these radios use the same amplifier for the PA and receiver output. If the radio is receiving (usually the needle on the meter moves) then it may be bad contacts on the relay. Before pulling it apart check that the squelch setting is set to low and the RF gain is high. Check that the external speaker jack is not damaged (internally). If all seems OK visually try to connect one wire from a speaker (8 ohms) to the chasis of the radio and then use the other wire to probe different wires that are connected to the external speaker jack and on board speaker to see if you get an output there.

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Cb problem have a cobra 19dx iv with a 2ft magnet mount cobra antenna swr is good, receive is good, but muffled output

Hi and welcome to FixYa,

Which output is muffled, transmit (modulation audio) or receive audio?

If you are referring to the receive audio, initially, have you tried an external speaker? If it works good, then it would be an internal speaker problem; if not then others to check would be:
  • IC1 - KIA7217AP audio IC;
  • CM 10 & 15 - audio output capacitors 470uF / 16V.
if it were transmit / modulation audio, try replacing the mic.

Please postback updates.

Good luck and thank you for asking FixYa.

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1 Answer

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Hello..if you can try to connect a external speaker or phones..if the volume is ok..than i think it is time to replace your internal speaker..pse tll me....good luck...Ron

Mar 14, 2008 | Midland 75-822 40-Channels Handheld CB...

1 Answer

I can't hear through my internal or external cb speaker

Can you hear static when the squelch is at minimum ?. If you can hear static then tere is nothing wrong with the audio system. If you are sure about the squelch, connect goosd speaker directly to the 2 wires coming from the main board bypassing the speker jack. if there is still no sound then the audio amp chip is defective. The audio amp can only be damaged if the output is shorted for a long period of time.

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