This manual is downloaded from the FoxTango site, Yaesu. FRG HF Receiver. Survival Guide. Revision 2 march. If you want to work on your FRG, it is a must to have the manuals and schematics. See: The manuals are very informative and deal. The purpose of this manual is to provide the reader with information critical to the nance of the FRG general coverage communications receiver.

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I have to see what I buy. Your best bet is to obtain a spare set with a defect display or otherwise, and use the good IC. I can recommend the Graveyard section on the Fox-Tango site, they are a excellent source for special parts. I have no problem with that, if the receiver is electrically sound.

I did a test, the plastic was not affected by the thinner. If they fail once there can be a reason they fail again in the future, and putting in a socket is cheap and makes life easier when the need arise. The pages are in German, so I will give a translation of the mods, for the benefit of all of you who are not fluent in that language. Troubles I have encountered so far: This wire has to be some 10 cm longer than the others.

YAESU FRG SCH Service Manual download, schematics, eeprom, repair info for electronics experts

After putting it in the socket, all bands were now in the correct order. You can obtain a used one in manuao condition for a affordable price on ham fests or on Internet.


A change for 4x 1N or another bridge rectifier is also possible.

There is not much difference between the first and the last receivers, the only thing I saw was a different coupling of the frequency scale to the dial mechanism. I used parts what I had on hand, special the mini chokes, I listed the used ones.

CFJ k6 or, much more expensive: I use it also for repainting and refill markings on boat anchor receivers, like the RA and Racal.

Under 2 Mhz manial FRG is in my opinion very unsensitive, and if I want to do some Dx-ing in this band, I use my RA receiver, I will try to make my FRG at least as sensitive, it will be the next mod project, and I will update this page, when I have everything figured out.

I took the switch out and removed the back plate.

manuql The only drawback is that you are limited to 2 manuals a day. All of them had higher values from 2. Rub it dry with an old cloth.


Scanned document, reading partly badly, partly drg-7700 readable. It is really necessary to remove the power cord, otherwise you do not fdg-7700 all the power, with disastrous results. In another case I found diode D43 that was no diode anymore but a resistor of 5k-ohm, the on and off time of the display was the same, and there was a curious frequency display.

You can check the age of your FRG if you look at the serial number: I changed all three diodes for 1N types, because they had a bad oxidation of their leads. Most of the time the problem is a loss of the frequency coverage, usually at the end of the tuning scale.


The set and fr-g7700 module is very stable, but some changes improve the receiver considerably: In some occasions parts of the second layer flaked off. Comments 0 No comments yet.

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Dial lamps are long lasting, but they have to be changed now and then. Painting the front is as a whole is almost impossible, the lettering is printed frgg-7700 the front and is easily damaged. If I got a spare, changing the IC was done in no time. So I clean everything, including knobs and dials with water and soap and a old toothbrush.

Trg-7700 soldered everything spider-style to the tuning condenser. The counter displayed only a right-hand zero, the clock was partially working, the AM Led was on all the time, the ON and OFF timer had the same time, only the countdown timer was working. Another manhal of modifications are described on a very interesting Swiss internet site: So I took the VFO out the receiver, a very easy job, although it means the removal of all knobs, scales and front panel.

The displayed frequency is the PLL frequency 0.