No its the audio chip that has shorted out its mounted on the center middle of the radios circuit board, and the radios side chassis is the heat sink,open it up and when it starts to get hot and motor boat/machine gun,spray it with circuit board chiller(available at any electronics parts dealers)and see if it ceases,also spray any nearby capacitors and the board too as if a cap gets hot in this circuit the thing will either short or go open and chilling these components will heal them till they get hot again,then just replace the suspect component
The noise comes from the power supply.It is a static sound that comes from the voltage out put of the transformer...this static is suppose to be filtered by the capacitor..replace this capacitor with the same rating and value riffle DC voltage happens when this capacitor is faulty...good luck
Tony
I'm in America and this site is based in America so unless some indicates being from across the pond I have to assume they are also in America. They are about the best for 10 meter and SB for that matter. Over here people modify them so bad, they turn a perfect radio into trash and they often ruin fast and that was the basis for my original statement.
You also stated that SB worked fine in your original statement and that only AM and FM works OK but then in your second statement you say it gets hot in any mode. The difference in those statements can effect my diagnosis. If it gets hot in any mode then the IC chip can absolutely be the offender as well as the voltage regulator for that matter. If it worked as with your original statement OK on SB then I would be less inclined as the IC would effect all modes.
I had one do this to me one time and it was the transistor feeding one of the crystals and had to replace the crystal and the transistor.
The only way to be positive is to either enlist an Oscillator Scope or replace a parts or two. Start with the voice chip.
Or rather the radio messed up on FM and AM and SB was OK.
Hi Collin, A cap you can test with a multi meter. Unsoldier it and check for polarity. At least enough to see if it is faulty. It's getting hot because something is shorting or surging.
PLL 2 VCO Voltage Set radio to 24.890 MHz, AM RX mode. Frequency setting at 29.699 MHz. Connect Multi-meter to TP10. Should read 4.5 VDC
PLL 1 VCO Voltage Set radio to 24.890 MHz, AM RX mode. Frequency setting at 32.000 MHz. Connect Multi meter to TP11 and this should read 6.5 VDC.
AM APC Set radio to AM TX mode. Connect Multimeter to TP8 VR15 6 VDC
SSB APC Set radio to USB TX mode. Connect Multimeter to TP8 VR18 12.5 VDC
There are some voltages for you to check.
Regards,
Tony
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Hi,
This problem comes froma faulty CPU or MCU board. You may needto replace it. If the buzzer is constantly making a noisewhen the radio is in AM, FM and CW but will not change frequency when FrequencySelector is moved and the Up Down functions buttons work OK Then the frequencySelector needs to be replaced.
Instructions
Connect one end of your coaxial cable to the output port on your SSB
Transmitter. Connect the other end of the cable to the coaxial input port on
your RF demodulator.
Connect one end of your 1/4 inch audio cable to the audio output port on
your RF modulator. Connect the other end of the audio cable to the audio input
jack on your amplifier.
Turn on your SSB transmitter, RF modulator and amplifier. Adjust your
SSB transmitter modulation by adjusting the knob on your RF
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hi tony
i use my ranger on the 10mtr FM part of the band where all the 10mtr repeaters are! 29mhz
we have a major group of hams on this here in Australia and also in the UK when i lived there
so my radio only gets used on USB/FM nobody uses AM , these are one of the best 10mtr radios around for FM work!!! as i said the heat is coming from the voltage regulator next to the audio chip and i dont have echo i have opened the radio to check for heat the power levels are right 25w ssb 10w fm the rear end of radio dont get hot,hot on any mode
something is causing the voltage reg to heat up? not sure if it is the audio ic ? i have a new one of those to solder in but not sure till i get some more answers cheers
Hi tony
the radio works fine on SSB the problem is only on AM / FM
so i only get major heat from voltage ic when using AM/FM
the heat i get from the rear end is normal on both SSB/AM/FM
the problem aint at that part, its gotta be around the voltage reg / audio ic
dept!
so when it heats up real bad this is when i get the machine gun noise blasting thro
my speaker the only way to stop the noise is to pull the power wait a minute then reconnect
it will work fine for say the first key then the noise is back or sometimes by turning up the volume control the noise will start only if it has been doing it
i have seen this problem on a radio 20yrs ago but cant remember what the cause was?
think it might of just been the audio chip or a cap?
just dont wanna solder this new audio ic in in case it gets damaged
not unless im sure this could be the problem?
have you any idea what voltages i should get on the legs of the audio ic
i can then test cold then hot? what about a voltage check at the voltage reg?
what other reason would there be for this part to hot as hell??
colin
hi tony
done that but cant get a reading doing the apc i take it i need to remove the short pcb? i get no reading on tp8 do i have to bridge tp7 & tp9 before i get a reading?
col
hi the buzzer aint buzzing. the voltage regular gets hot real hot after keying the radio for more than 30secs on AM or FM once the side of the radio heats up where the audio ic is the radio starts making a very loud motor boating / machine gun noise coming from the speaker which only
i can hear, if i key up while the noise is happening the person whom i am talking to dont hear it
it only stop when the radio cools down! so something is causing the voltage reg to heat up to quick or more than it should! SSB on the radio works fine i can talk till the cows come home! no heat??
hiya
what cap is it?? thanx
Ranger 2950dx over heating problem
on FM tx the voltage regulator 2SB827
get so hot within 30seconds you cannot touch it!
its fine on SSB all the levels in the radio are fine ,but after 5minutes of this heat i get an audio problem where this loud motor boating noise
starts and the noise level is increased or decreased by turning up/down the volume only way to stop the noise is to pull the 12v supply and let it cool down i need a fix before the big hammer comes out!!!!
change C182 to 1uf
Exactly same problem with mine, anyone found the answer ??
It's not the caps, or the audio chip, but still testing...
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