Question about Maxon MCB-40 40-Channels Handheld CB Radio

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Maxon Model MCB10A

As confirmation this a mobile hand held transmit/receiver radio with a 3"X 1-1/2" medal box for the antenna and power supply connections. The unit does not transmit but receives fine. The SWR is okay. Trouble shooting suggestions would be appreciated. Don.

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Re: Maxon Model MCB10A

In order to test this unit you will need a power meter with a dummy load. connect the power meter and turn on the unit, key the microphone and look at the power meter it should have a reading of < 4 watts PEP unmodulated and = 4 watts PEP modulated. If you do not have this reading the RF transmitter in the CB might be malfunctioning. You will need a RF generator, a power meter with dummy load, oscilloscope and a multimeter to troubleshoot this problem with. If you do not have or do not know what this equipment is or how it works, please take your unit to a CB repair shop. Thank you, Shuttle83

Posted on Oct 07, 2007

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Hello, I believe that that might be your voltage regulator heating up. This means that there is an internal short in the system. To tesat this properly you will need a 12V power supply, a multimeter, the specifications, and a dummy load antenna. 1) take the cover off of the CB. 2) turn the multimeter on DC current and connect it in series with the red power lead of the CB and connect the red to the + of the power supply. then connect the black lead to the - of the power supply 3) look at the specifications and record the current drain when the unit is receiving not transmitting (write this down), Then power up the CB and record the current drain. If it is high it denotes a short circuit, if it is low then there is an open. 3) look for smoke comming from the rear of the CB this will tell you what component is heating up, locate it on the schematic and see wheat the problem is. 4) replace the bad components I hope this helps, Thank you, Shuttle83

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