IC7300 : Pannes rencontrées

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IC7300 : Pannes rencontrées Empty IC7300 : Pannes rencontrées

Message  F5PBG le 23/3/2019, 09:33

Le nombre d'IC7300 commercialisés étant important, les pannes finissent forcément par être plus "visibles".

Sensibilité aux surtensions à l'allumage de l'alimentation notamment :
Cette panne est récurrente manifestement. Elle a été rencontrée entre autre par F1DQM.
Le poste ne s'allume pas à la mise sous tension de l'émetteur.

Je serais possesseur d'un ICOM IC7300, je protégerais la sortie de mon alimentation pour
éviter tout risque de surtension à l'entrée ce décamétrique radioamateur cf. ce lien (cliquer ici)
Il est possible de placer cette protection directement dans l'alimentation, cf. cet exemple (cliquer ici)
ou tout simplement à l'extérieur de l'alimentation sur les bornes de sortie
(placée dans un œuf Kinder sans le chocolat ou dans un tube de cachet effervescent par exemple)
SV7BOY a écrit:After interruption of electricity supply simultaneously twice
The ic 7300 does not open
It has an acquaintance
knows anything
Change it with a new  fuse  but the problem remains .Νot opened. Measure the voltage is 13.8 volts

Absence d'émission :
Possible erreur d'utilisation ?
Panne de l'étage final HF suite à utilisation en numérique à puissance trop importante (supérieure à 30% de la puissance maxi) ?
Problème de boite de couplage ? (boite dont les composants sont de taille que j'estime un peu faible... Je ne l'utiliserais pas quant à moi)
Aucune idée...

Je ne place dans les retours d'expérience que les vraies pannes et non les erreurs de configuration de l'opérateur...
WB4MNK a écrit:Using IC-7300 with ver 1.30 Icom driver.

When keying IC-7300 with CW paddle, Mic, transmit button the transmit light lights up as it should but NO POWER OUTPUT.
ALC goes almost full scale and Amps go full scale of 25 amps. These readings are from the IC-7300 meter. The readings taken from the ASTRON SS-30M Power supply show 5 amps and 13.8 volts when keying the IC-7300. I hear a relay energize when I key the IC-7300.
Also saw a sound card error window pop up on the computer. Checked WSJT-x sound card settings and they had changed from the USB Codec in the IC-7300 to the Realtec in the computer.

With the IC-7300 only connected to a dummy load I get the sam readings.

Anybody had this problem before and if so what is the fix ? 
What rig setting can I check that would keep the IC-7300 from putting out any RF power?

Appreciate any help!


Panne en émission uniquement en CW (Morse) :
Retour d'expérience très intéressant, l'origine de la panne est le strapp CMS R201.
N0SA a écrit:Found the problem.
There is a tiny SM 0 ohm resistor R201 from the common/sleeve of the 1/4" jack that goes to ground. It was open for some reason.
I put in a small solder bridge bypassing it and all is well.
I have no idea why this 0 ohm resistor is there or why it went open but the problem is fixed.
thanks for all the replies.
W6XA a écrit:Those zero ohm resistors and tiny chokes are used as electrostatic protectors. Apparently you had a charge on the key or your body when you plugged it in. They are a pain because they blow frequently. But they blow for a good reason and I always replace them rather than bypass them.

Thank you,
Paul W. Hansen, W6XA

Amateur Radio Service
2134 Carthage Road
Tucker, GA 30084
(864) 222-3539 office

Panne de réception suite à champ fort :
Un classique très connu autant pour la panne que pour la solution adoptée (diodes en position tête-bêche en protection à l'entrée du récepteur).
Ne pas négliger l'effet capacitif d'un coaxial comme le souligne W0LEV.
La "réparation" de l' IC7300 de WA3RSL a consisté en l'échange de la carte RF Unit...
WA3RSL a écrit:1 week old 7300. Got on 10 meters. All well as usual. Then suddenly preamp 1 and 2 are dead.
Did a full reset no change. 

It's snowing here. Did I get a static discharge damage my radio?

Is there and internal fuse?
Or is option to send out for warranty repair?

All works except the preamps.
Nothing but radio. No amp here hooked up.

mytarget@o2.pl a écrit:I soldered right at the RX input, inside the transceiver and directly on the PCB,  a popular "surge arrester" composed of 2 cascaded 1N4148 diodes (2 sets, each in inverse direction) in order to protect the vulnerable input of the receiver. Of course there exist better diodes,  but 1N4148 have very high impedance up to ca.0,5V and have small capacitance. They are quite adequate  given the amplitude of useful signals at this point.  But I repeat: I placed them at the RX input,  not at the antenna (TRX) input - they would blow up on transmit....   Alex.
WØLEV a écrit:If even a minuscule spark happens (as when connecting coax to the rear connector), it can spell disaster for digital circuitry of today.  Realize that a length of coax can become charged and, when connected to something that can discharge it, becomes a highly efficient charged line 'pulser' which can deliver a 'slug' of charge in a rather rapid manner (Vp of the coaxial cable).  It can deliver enough energy to launch an RF field into the volume of what ever it is being connected to.  On connecting coaxial cable to anything electronic (and what isn't), I always make a habit of shorting the end with my finger and hold it there for a couple of seconds.  I've learned the hard way that connecting a longer coaxial cable to some very expensive equipment can render the front end an instant dead end!.   Ever since that occurred I make it a habit to short the coaxial cable with my finger before connecting it to anything.  This even goes for patching various equipment together with 6 to 10-foot RG-58 cables in my lab.  I may be paranoid, but I've seen too many times what a small electrostatic discharge can do to modern electronics, anywhere from flipping bits to permanent damage.  The more digital hardware, the higher the risk.  I just hope and pray that my 7300 and 7610 make it through next year's thunderstorm season without problems.  This, not from direct strikes, but from radiated fields from close-by strikes.
WØLEV a écrit:Two summers ago, I took damage from a lightning strike roughly 0.25 miles distant.  The damage was from radiated fields due to the strike.  It got to a nice HP 20-amp lab bench supply, a laptop, that garage door opener, and a smaller lab bench (HP) supply, and scrambled the bits in another laptop.  Many do not realize that radiated fields from near-by strikes can do damage.  When you consider 10's of thousands of amperes traveling along a healthy chunk of plasma, there will be some healthy radiated fields generated.  We have a metal roof and much of the siding is also metal.   This was not adequate to 'protect' the electronics.  Adam's advice is good:  When not in use, disconnect everything, leave no hanging wires.  When in the mountains, we received another close-by strike, maybe 0.5 miles distant, that destroyed an FT-817.  The power wires which were maybe 15-feet long were connected to the radio but nothing else.  The radio was just sitting on the window sill.  In the same mountain location, nearly every strike within a couple of miles induced an audible "tick' on all the clamp-on ferrites I had installed on every conductor that went outside.   Same mountain location:  Yet another close-by strike produced a rather major offset in the local magnetic field that took about 45-minutes to decay back to ambient (I had a magnetometer running 24/7 at the time). 

Enough 'war stories' regarding lightning damage.  Disconnect everything when not in use.  Don't leave wires just hanging but bundle them - less of an antenna.  My test equipment is unplugged when not in use.  It's a bit of a pain, but I could not replace much of it.   It's this sort of 'threat' the amateur must protect against.  Protection from a direct strike can be accomplished, but the cost is too high for us average peasants (not Uncle).

BTW:  A coaxial cable is a very good cylindrical capacitor - after all, its a feedline.  It will store charge for days.


Problème d'affichage OVF (overflow) sur signaux forts reçus :
Ce n'est pas une panne, c'est une limitation bien connue des récepteurs FPGA,
d'où l'ajout d'un présélecteur sur l'IC7610 pour se prémunir des signaux forts hors de la bande de réception en cours d'utilisation,
d'où la technologie hybride employée sur l' Elecraft K3S et Yaesu FTdx101 pour se prémunir des signaux forts dans la bande de réception en cours d'utilisation.
Ci-dessous un retour d'expérience parmi d'autres. Voir également les vidéos Youtube sur le sujet.
K6MSM a écrit:I'm concerned about the frequent display of OVF on my IC-7300.  I run two rigs typically, with digital JT65/JT9 on a IC-7410 and voice/SWL on the 7300.
Even at 15W on the 7410, I frequently see the OVF pop-up on the 7300, which greatly reduces sensitivity.  I frequently have to reduce RF gain, but it's quite variable.  The antennas are cross-polar, so having this problem when TX and receive are separated by multiple MHz on the two rigs was surprising.

Thank you for the information about the band-pass filter step from 10-15MHz.  I will do some more experiments and research on what the other steps are.
This concerns me for my plan to use the 7300 at field day where there's other transmitters at the same location, sometimes on the same band (we are a 3A, so it could be a lot worse).  Looks like we might need those external band-pass filters this year.
I am curious to learn more about this.  I haven't seen any mention of a roofing filter, but guess that isn't needed for SDR receiver architecture.
Otherwise, I've been very happy with the 7300.
73, de Mike

Pic de puissance ("overshoot") en début de l'émission :
Je n'ai pas entendu de radioamateur français se plaindre de ce défaut sans doute pas systématique.
WR3KI a écrit:I'm seeing an initial output spike with my 7300 on SSB transmit. When set at 50 watts,(or 50%) the rig spikes at 87 watts PEP output. When set to 100 watts, (or 100%) I measure an initial spike at 154 watts. This is being measured on a Bird meter, with peak reading kit, & on my Acom 1500.

I contacted Icom Tech support, spoke to Rick. He advises this is "normal", & it is my amp that is at fault here, not the 7300. Advises my amp need an ALC output, to limit the 7300, & this would stop any spike.
The Acom 1500 does not have an ALC output, so I guess this is a no go with the amp here.

Any thoughts or work arounds on this ?. Would be much appreciated.
Nota : Pour ceux qui ne lisent pas l'anglais, Google translate est leur ami...

A bientôt,
Ludovic - http://inforadio.free.fr

Date d'inscription : 08/06/2008


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