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HomeAircraftHelicopterRadio - Spektrum DSM › XP9303 had a bad "fit" and died on me.
08-04-2009 06:55 PM  8 years agoPost 1
JOJO HELIS

rrNovice

malta (Europe)

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Hi everyone,
although I am a bit silent on this forum,I admit that I am a daily visitor, and learn a lot, not to mention when I have a problem I post my request for any help.

So here it goes:
I have a Spektrumized XP9303 which, for a few years worked fine, until yesterday. I needed to change model, and yepp it's gone haywire!! Lots of garbled info on the display until it died with either a white screen or a totally black screen on the display

Looked at the forum and found this topic, but to be honest I am not sure how I'm going to fix this problem. I wrote to both Horizon Hobbies in the States and also in the UK, since the Radio was purchased from the States but I live in Malta (Europe) A tiny island 60 mils sought of Sicily.Till time of writing this email (24hrs later) I have not received any replies yet.

What I am not sure of is that a week ago, by mistake I left the TX on till the batteries died. I rechareged the batteries, and made use of the TX for 3 or 4 times without any problems.So I presume that this had nothing to do with this incident..
My biggest concern is losing the settings of 5 helis, which we all know what it's like when you have to go through a painstaking chore of reprogramming, of which one is a turbine! :-(

Any suggestions are more than welcome...

Can anyone tell me to whom is it best I speak to?
Where is my JR support?

Thanks all for your interaction..

Cheers

Jojo
Malta

Jojo Helis

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08-04-2009 07:13 PM  8 years agoPost 2
JOJO HELIS

rrNovice

malta (Europe)

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Was thinking about this problem....

If I am not mistaken, it is highly possible that the Processor needs changing.(from what I read)

If this is th e case, is this the pcb that is full of plugs in it? which is just above another pcb which has for chips on it?
The one with 4 chips on it is presumably the memory of the TX right?

So, if I manage to purchase a used XP9303 and change this upper PCB, do you think that I might save the TX and it's programming?

Appreciate your views on this one

Thank

Jojo

Jojo Helis

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08-04-2009 08:34 PM  8 years agoPost 3
9387ASH

rrElite Veteran

UK

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Simple answer is that you have lost your model memories. There is no external memory IC as it's all embedded in the processor (which is that top board)

The lower pcb is the graphics board.

Unfortunately due to the Distribution Agreement between JR and their distributors, no-one is allowed to work on system that was not sourced from that geographical area.

ie... Horizon is not allowed to work on a system from the UK or Australia, MacGregors is not allowed to work on Horizon sourced systems. (MacGregors is JR for the UK and certain parts of Europe)

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08-04-2009 09:28 PM  8 years agoPost 4
JOJO HELIS

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malta (Europe)

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thanks for that info.
So the way I see it is to wait for Horizon Hobby's (USA)reply, and see what they say it could cost me. Then maybe it would be worth considering replacing the whole TX.....

So there absolutely no way in salvaging the memories?

Shall have to wait and see.

Bottom line is that I am grounded for the time being...

Jojo

Jojo Helis

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08-04-2009 10:06 PM  8 years agoPost 5
9387ASH

rrElite Veteran

UK

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So there absolutely no way in salvaging the memories?
Nope, the CPU has crashed due to the supply voltage dropping too low. As the model memory is part of the CPU it's not possible to recover them.

It's a shame that JR went away from having the 3V lithium cell as the back up for the model memory, but it's what was demanded by the big boys.

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08-11-2009 10:49 PM  8 years agoPost 6
bowies12

rrApprentice

Surrey - UK

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Does this mean if I take out the battery to charge, I might lose all model memories?

Fat birds can't fly

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08-12-2009 12:03 AM  8 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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Removing the battery will NOT erase your model memories. They are stored in a non-volatile memory, probably a FLASH memory. This memory does not require an external battery to keep its contents alive when the main power is off. FLASH is not easy to corrupt, but it can happen.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-12-2009 04:13 PM  8 years agoPost 8
JOJO HELIS

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malta (Europe)

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From what I understand, is that it can happen only if you leave the radio on till the batteries are so low that it( the TX) goes OFF.

probable reason being is that when you switch your radio OFF, while doing so, you are storing the last codes into the Flash.

So it think it is important not to ever leave the radio ON till it 'dies'..

hope this has been rectified in the new 12X as I have one on the way....

Jojo

Jojo Helis

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08-14-2009 03:14 AM  8 years agoPost 9
max232

rrVeteran

Pensacola

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i have a bad memory, and as a result left my tx(9303) on at least 6 times
for over 24 hours, and i have just recharged it. havent lost any programing yet.

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08-14-2009 03:25 AM  8 years agoPost 10
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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I left my X9303 on and the battery slowley died. At some very low voltage the cpu goes wacko and probably writes junk to the flash memory befor it properly shuts down. Disconnecting the battery is not the same, the sudden drop of battery voltage allows the cpu proper shutdown without going berserk. It may not happen every time you leave the xmit on and the battery slowly dies, but it does happen, so be careful about running the transmitter battery down. (I bought a used DX-7 to use as backup while my X9303 was in repair).

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-14-2009 11:54 PM  8 years agoPost 11
9387ASH

rrElite Veteran

UK

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It doesnt matter if the the set is left on and the battery runs down. It's the action of turning the set on with a low battery, this causes the voltage to drop under load whilst the cpu is booting up and accessing the NVRAM, this causes the CPU to only partially load and thats when it corrupts.

So if you do run your battery down, charge it first before turning the set on.

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08-15-2009 10:24 AM  8 years agoPost 12
JOJO HELIS

rrNovice

malta (Europe)

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Ok got it!.

Although to be honest when I found out that the battery is dead, I did recharge it,and made use of the TX for a few times. So this did not happen immediately when I found out that the battery was dead (although I did try switching it on and off to see what's wrong..maybe I initialized the eeprom to become corrupted

In the meantime Horizon replied to my email and asked me to send the TX.
Considering the freight involved to send it plus insurance, and have it sent back, I think it would be better for me to try and find a processor to replace it myself.

It seems that PCM9XII, X9303 and XP9303 all make use of the same processor.
So anyone out there who has a dead TX with a good processor, can contact me should he wish to give me a price?

Thanks

Jojo

Jojo Helis

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08-15-2009 08:33 PM  8 years agoPost 13
bowies12

rrApprentice

Surrey - UK

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MacMan, Can Jojo just reset his model memories to get a working tx again, though he will obviously have to reprogram his settings,

or is this something that has to be reset using special equipment back in the workshop?

It seems Jojo is trying to get a replacement CPU, which I cant believe is necessary.

Fat birds can't fly

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08-15-2009 10:31 PM  8 years agoPost 14
Slartybartfast

rrApprentice

Somewhere in England

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The pcb has to go back to JR in Japan as I know that MacGregors (UK Disty) hasn't got the facilities to reprogram the CPU.

The problem is that the pcb is a US version so MacGregors wouldn't be able to help because of JR's ruling about Regional Distribution.

JoJo could try asking Horizon if he could send the faulty pcb to them for replacement, but did JoJo buy it from the US ? That may cause problems. Or alternatively, he could try sending it to JR in Japan for repair.

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08-15-2009 10:45 PM  8 years agoPost 15
9387ASH

rrElite Veteran

UK

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Slarty is correct, the pcb has to go back to Japan.

Even if you managed to locate a "spare pcb" from an otherwise dead system, you would have the problem of calibrating the pcb to the set.

I would pester Horizon seeing as you bought it in the USA.

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08-15-2009 11:02 PM  8 years agoPost 16
bowies12

rrApprentice

Surrey - UK

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Thx, Thats cleared up a lot of questions.

Fat birds can't fly

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08-16-2009 07:58 AM  8 years agoPost 17
JOJO HELIS

rrNovice

malta (Europe)

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Ok, I understand what you all mean....

And thanks for your input.

What a captive market this is!!!!

Jojo

Jojo Helis

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