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Clean contacts circuit board

How do i clean a cb radio circuit board

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With compressed air then achole

Posted on Apr 14, 2014

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Posted on Jan 02, 2017

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I need a schematic diagram for a cb radio the radio is a electrophone model cb-550 PCB is a PTBM058COX with a SWR meter PCB PTSR007AOX need it to wire the SWR meter to the main board please help?


This circuit board is manufactured by Uniden, I believe. I was searching for it last week and found it by googling PTMN058COX Schematic. There are many brands using this board so don't worry about the brand name. Just download the file.

Oct 11, 2016 | Radio Communications

1 Answer

My radio wont transmit,but when i tap the top of radio,it transmits


hello this could be down to two things either you have a dry solder joint on the board or your board is cracked open top panel and check for dry joints or a crack in the circuit board
goodluck

Apr 02, 2011 | Connex 3300 240-Channels Base CB Radio

1 Answer

I have a cobra CB. I went to hook it up today, and the fuse popped. I went to unhook it and noticed that the radio was smoking. I took the cover off to take a look and see if everything was OK. There is...


Most CB radio have a diode near the B+ leads going in the circuit board, by your description when you hooked it up you probably got the + and - mixed up and put them in reverse by mistake, when this happens it will short out the diode and sometimes destroy the audio output ic and open a trace on the circuit board before it blows the fuse as it smokes. The diode must be replaced and burnt spot repaired on the circuit board, if you are very lucky the audio ic will come out unharmed.

Mar 02, 2011 | Cobra 19 DX IV CB Radio

1 Answer

CB radio will not put out any distance


Sounds like its not getting its full power to operate, check that each one of the nine batteries have the full volts it takes to get the four watts out-put, also check the antenna where it connects to radio,sometimes this gets corroded and needs to be cleaned

May 22, 2010 | Midland 75-785 Handheld CB Radio

1 Answer

Where can I get a circuitboard schematic for my


Try the radio shack website.
They have some service manuals that you can download.
Best of Luck!

Mar 11, 2010 | Radio Shack TRC-503 CB Radio

2 Answers

I would like to find the correct 2 digit channel display for the Galaxy DX77 CB Radio. The display in my radio has one segment out and can be confusing as to the channel you are seeking. Does anyone know...


I don't know whether this is an LED or LCD type. Finding an exact match would be difficult except from the manufacturer.

However, do CHECK the soldering of the display and the driver chip.

The segments almost NEVER fail on the LED. Soldering and board cracks and failed driver chips are usually more likely.

On the LCD displays, often they use a rubber strip with little wires to (looks almost like ribbon cable) contact pads on the glass from pads on the circuit driver board... THESE cause a lot of problems and often require a cleaning of contacts and the ends of the wires with isoprophyl alcohol and re-aligning.

Feb 06, 2010 | Galaxy Radios DX 77HML Base CB Radio

1 Answer

12V power gets to the radio but the radio does not function.


Open circuit on the PC board, open resistor on the board, fuse or possible bad on / off switch.

Jan 19, 2010 | Standard Horizon QUEST GX1255S CB Radio

3 Answers

My 18 WX ST Cobra CB radio will allow me to receive sound from the 3 weather stations it has on it, but I cannot pick up sound from other CB radios. help please?


get an swr meter and check your antenna first. if good problem may be in the circuit board.. they are famous for loose IF, TX mixer boards. or call us

Nov 03, 2009 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

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.


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
Ed
NC Electronic
Mills, Wyoming

Dec 18, 2007 | Midland 75-822 40-Channels Handheld CB...

2 Answers

Lost rx tx


You may have cold solder joints ( broken lead connection/s to the pc board) around the PLL chip area. Also you may have a switch that needs cleaned. To clean the switches, purchase some contact cleaner ( I use WD 40, although some techs don't recomend it ) and spray the switches and pots ( volume control, squelch etc )> Aviod getting any oil on the board. . Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 16, 2007 | Galaxy Radios DX-66V Base CB Radio

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