Yaesu Radio Communications - Recent Questions, Troubleshooting & Support


The problem is likely the TX/RX relay. If it is old (and I am sure it is) the contacts likely need to be cleaned, or the relay replaced. It is a common enough relay if you want to replace it. Also, pull each PCB card and clean the contacts with a pencil eraser. Pink erasers are OK but the white ones are better as they aren't as abrasive.

Hope this helps, VE3CMQ

Yaesu Radio... | Answered on Jun 04, 2019


a couple things you can try if nothing shows on the screen at all.
Do a full reset first of all, that's the best step with any hand held radio problems.
Try pressing F then 0 and if that don't work try battery removal and if you still get nothing time to call Yeasu they have always had firmware issues with handhelds I have a triband handheld that did the same thing

Yaesu Radio... | Answered on May 01, 2019


Check your transmit frequency to make sure it is within the proper range. Also verify proper battery voltage, it will typically transmit with low voltage.

Yaesu Radio... | Answered on Feb 08, 2019


I am not sure, but this usually indicates that the PLL has lost lock. These days, it could be as simple as a poorly soldered connection. I don't recommend that you try repairing this yourself as there are essentially no user serviceable parts in radios these days.

Radio repairs these days have come down to board swapping because the parts are so tiny that humans have a hard time replacing (and in some cases, seeing) the parts. Yaesu US has a very good reputation for quality repairs so I'd suggest you send it there. They will likely just swap a board out, but that will be less expensive than having someone spending 10 hours trying to find the problem and repairing it. I know, as I work in a radio shop, and if it isn't something real simple, all we can do is do a board swap.

Yaesu Radio... | Answered on Jan 13, 2019


Check the fuses and the power supply. Make sure that the power supply has enough capacity to run the radio, at least 20A! Make sure that the power supply is putting out 13.6V.

If you were unfortunate enough to hook the power leads up backwards, then a trace may be blown off the circuit board internal to the radio. Also, it is likely that the reverse polarity diode inside has shorted out. This may cause the fuse to blow when you apply power. If it has blown, it likely took the the trace out inside the radio.

If the power supply and fuses are OK, unless you are competent technically, the only recourse is to take the radio into a shop and get them to fix it. If you were upgrading the firmware inside the radio when it happened, then the radio is likely non-repairable.

I don't recommend ever upgrading a radio's firmware! If it isn't broken, then don't fix it!!

Yaesu Radio... | Answered on Jan 13, 2019


My guess is that the power supply you are using is not up to the task. You need one that will provide at least 15 amps at full output. Try setting your radio to a lower power setting and see what happens. You may find that you have to upgrade your power supply.

Yaesu Radio... | Answered on Jan 13, 2019


A free download of what? Schematics and manuals can be found at www.mods.dk.

Yaesu Radio... | Answered on Jan 12, 2019


It might be the RF switching diodes in the receive antenna circuitry. These sometimes get damaged due to lightning strikes nearby or hi SWR levels. That would be my first guess.

Yaesu Radio... | Answered on Jan 12, 2019


It sounds to me that your car is generating noise on the power lines and causing noise on the transmit signal. Make sure that your positive and negative leads from the radio go directly to the cars battery! This will help prevent this problem.

Yaesu Radio... | Answered on Jan 12, 2019


Unplug the mic. If it stays keyed up, then you have a problem within the radio. If it un-keys, then the problem is in the microphone. If it is internal to the radio, take it to a competent technician. If the problem goes away when the mic is unplugged, then get a new microphone.

Yaesu Radio... | Answered on Jan 12, 2019


Hello,

This is lucy from Cigstar, e cigarette manufacture.
Mango flavour electronic cigarette is available, Please kindly add my contact for further talk, thanks.

Best Regads
Lucy Chen ' Sales engineer
Email: Lucy@cigstar.com Skype:lucy.cigastar
CIGSTAR INTERNATIONAL CO., LTD
Website:www.cigstar.com

Yaesu Cigarette... | Answered on Jan 02, 2019


This is not a sentence, and 'keyup' is not a word. Make more effort to post a question that makes sense.

Yaesu Radio... | Answered on Dec 28, 2018


You cannot use that adapter to charge ecigs!
The batteries will hit up & explode because high voltage.
First of all it provides 6V which is too much and all ecigarettes that i know use a MicroUSB port for charging (or firmware update on mods)
Usually any ecig battery or mod will use the default USB voltage which is 5V and max 2.4 Amps.
Do NOT use over 5 volts on ecigs unless you got a special model that asks specifically for that power (very unlikely)
As a side effect from vaping ecigs...all i can recommend is to use more or only VG (Vegetable Glycerine) instead of too much PG (Propilen Glycol) on the liquids.
PG can give some side effects to sensible persons as dry throat, strong coughing, some throat bitterness.
Unfortunately most eliquids use plenty PG because it boosts the flavor!

Yaesu Cigarette... | Answered on Nov 29, 2018


In the case of your radio, this answer is incorrect if you are getting them after digital transmissions. On the Yaesu FTM-400XDR to turn off the beep after someone transmist you want to go to the setup screen. then press the TX/RX button. Then Press Digital button. Then set option 4 Standby Beep to Off.

Yaesu Radio... | Answered on Nov 28, 2018


This could be many things but a good place to look is the TX/RX and ATTENUATOR relays. These are problem areas in a lot of radios. This is a complicated radio and if you need to ask this question I would suggest you find someone that knows how to work on these. It will require a fair bit of skill to find the problem and replace the parts. The radio has a lot of surface mount components which are difficult to work with without causing more, and often, expensive damage.

Yaesu FT-990 DC... | Answered on Nov 03, 2018

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