Question about Galaxy Radios DX 77HML Base CB Radio

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Jumps frequency radio is in semi-truck,problem occurs more when radio is warm, sometimes a lite tap brings it back. Frequency jumps from 27 to 24 but anything is possible I am useing a counter a fc347

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Hi there,

There is a IC called (oscillator circuit), during warm-up it changes Frequency automatically. It means its the time to change that IC.

Good Luck...
Thanks

Posted on May 16, 2009

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Posted on Jan 02, 2017

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Hyundai HQP421SR will not power up, red power led lites press power button and green lites but no picture. press power button again but will not go to stant by mode, lite remains green.


This is a fault solution which can be checked and corrected by you assuming that there is no component failure. There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit with some of my tips:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Thank you for using Fixya.


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