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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › GY502 Converted to GY601 - Test flight = success
10-10-2005 07:08 AM  13 years agoPost 201
Juvaknin

rrVeteran

ISRAEL Jerusalem

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Well Done! good job!

**Raptor 50SE, GY601, Futaba **

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10-10-2005 11:05 AM  13 years agoPost 202
Bllade

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Chester, NY

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OMG.... Did you use that solder gun to solder on your circuit board??

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10-10-2005 02:30 PM  13 years agoPost 203
rc-whirlybird

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Shelby Twp, Michigan,USA

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Yes, I use that gun (in pic) 230W. .
I don't remove the R on the front, just cut the circuit line on the leads side.


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10-10-2005 08:56 PM  13 years agoPost 204
tadawson

rrElite Veteran

Lewisville, TX

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Gad! You are lucky the gyro is still alive! For the kind of work on these 10 to 15 watts is more than enough of a soldering iron . . . . . . . and a very fine tip, instead of that club . . . .

- Tim

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10-10-2005 08:59 PM  13 years agoPost 205
Juvaknin

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ISRAEL Jerusalem

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naaaaaa rc-whirlybird just "shooted" the parts down
the most importent thing is that the Gyro woking well

**Raptor 50SE, GY601, Futaba **

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10-15-2005 04:05 AM  13 years agoPost 206
StevenTodd

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New England

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I too was able to make this mod and IT WORKS!
Good thing I have that brand new weller ultra fine tip soldering station.

Since this is actually an new in box 502... now a 601 I need to mount it and try it on on eof my heli's.

Anyway to convert a 501 into somehting better? I have several ships each with a 501.

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10-15-2005 05:04 AM  13 years agoPost 207
Juvaknin

rrVeteran

ISRAEL Jerusalem

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Steven, unfortune there is no way to make the GY501 to something better..

**Raptor 50SE, GY601, Futaba **

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10-17-2005 06:51 AM  13 years agoPost 208
StevenTodd

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New England

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What pulse width is a Futaba 9205 servo? And will it be a good match with my newly modded 502/601 ?

How do you find out the pulse width of servos?

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10-17-2005 07:12 AM  13 years agoPost 209
Juvaknin

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ISRAEL Jerusalem

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for using ANY servos other then 9251, you need to use Wide Puls and "not" Narrow puls!

**Raptor 50SE, GY601, Futaba **

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10-17-2005 01:14 PM  13 years agoPost 210
Bllade

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Chester, NY

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WHAT CAN GO WRONG WITH THIS MOD?

Has anyone performed this modification and NOT had their gyro work afterwards? If so what were some of the problems encountered after the mod.
I installed the components on a 502 on Saturday, when the unit powered up it woke up as a 601 and then I reset the unit. Afterwards it would not recognize the sensor.
Thinking that I may have a faulty component I installed new components(except the Maxim chip) and afterwards the unit would not come on at all, alls I got was a dim display of boxes in the LCD.
Any thoughts?

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10-17-2005 03:13 PM  13 years agoPost 211
KCT

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Ontario, Canada

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Could it be an ESD issue ?
usally it works rightaway without any problems.

Can you verify the operation valtage ? Are you happy with the soldering spots ? Just double check them and resolder if neccessary and then try again.

Cheers

Kay


That's not flying, that's crashing with style...

TeamBob00, WildCat, Helitron,

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10-17-2005 05:37 PM  13 years agoPost 212
Juvaknin

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ISRAEL Jerusalem

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Bllade,
i made something like 12 convertions!
and one time i had the problem that the sensor wasn't working..
the problem was the MAX1241 was bad and i replaced it..
anyway check again all your soldering and even solder it "Again!"
sometimes it's looks like it's soldered good but it's not good!
so solder everything again even if you think it's good...
and see if you have made by mistake a short or something..........
hope you will get it work!

**Raptor 50SE, GY601, Futaba **

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10-17-2005 06:27 PM  13 years agoPost 213
Bllade

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Chester, NY

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I'm confident that the soldering was good, it is possible that the Max1241 was no good, but this was supplied by another person on RR.
I just recieved my samples from Maxim but I didnt specify the package type and ended up getting 2 DIP style chips.

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10-17-2005 06:44 PM  13 years agoPost 214
Angelos

rrKey Veteran

nr Oxford, OX11, UK

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Dim LCD probably comes from excessive load on the onboard regulator. Either the MAX is soldered backwards or you dropped some solder somewhere which is shorting something.

-Angelos

Spartan RC R&D

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10-18-2005 12:52 AM  13 years agoPost 215
the collective

rrKey Veteran

Bayside, NY, U.S.A

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The Maxim chip was not installed backwards, as the gyro woke up once as a 601 but didn't respond to the sensor. Bllade changed out the resistors and caps but did not move the Maxim chip, then the gyro would not boot up at all, just the dim squares on the display.

It was my 502 we worked on. We both looked it over under high magnification, no bad solder joints or stray solder anywhere to be seen. Bllade has the equipment and skills to do the job, I have no doubt of that.

I'm suspecting one of two things... I may have zapped the Maxim chip... Steven Todd needed one, so I opened the package to send one of the two samples I received to him. I may have zapped the remaining one when I handled them. Only thing is, the gyro did wake up as a 601 and let us reset it, it just didn't respond to the sensor, so I suspect the Maxim chip was working for at least the first attempt.

The other thing that comes to mind is that this particular 502 has been through some serious crashes... It's been in crashes that have vaporized several receivers and a few sets of servos. Maybe it was on the verge of dying before we attempted the conversion? If so, then I'm happy it died on the bench and not in the air in my Fury...

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10-18-2005 01:17 AM  13 years agoPost 216
KCT

rrVeteran

Ontario, Canada

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the collective

As far as I remember the presence of a 1k (or below) resistor in the
upper left corner of the PCB makes it to wake up as a 601 not so the
presence of the Maxim Chip.

Initially I had a similar problem, after the conversion the Gyro would
aknowledge to be a 601 but would not respond to sensor input.
Until I realized that the resistor near the LCD needed to be removed.

Then it worked perfectly.

However an ESD issue cannot be ruled out at this point. It may be the
most likely reason for this problem.

Cheers

Kay


That's not flying, that's crashing with style...

TeamBob00, WildCat, Helitron,

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10-18-2005 01:35 AM  13 years agoPost 217
Bllade

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Chester, NY

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Here is a pic I took of my workbench. I've got pretty much everything needed to do this type of work at home (it's just a hobby now).

I'm not sure if the link is going to work (i've never posted a pic in these forums), if not then you can view them in my gallery.

I looked over the failed 502 again today and could not identify anything wrong. If someone wants to do a forensic analysis on it I'd be willing to ship it to you and have it looked at.

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10-19-2005 04:28 PM  13 years agoPost 218
ChristianM

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Oslo, Norway

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I had some trouble with my conversion (the servo does not react to the sensor) so I am going back and verifying all the soldering points and I will try to replace the MAX1241CCSA chip. Luckily I ordered two chips so I have a spare.

I have one question: The chip has a "dimple" in one of the corners. Should this dimple be in the upper left hand corner or the lower right hand corner when viewed as on the attached picture? I originally installed it with the dimple in the lower right hand corner since the text on the chip was in the same orientation as on the picture but I can not see the dimple in the posted picture.

Christian

Burn fuel, be happy

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10-19-2005 05:28 PM  13 years agoPost 219
Juvaknin

rrVeteran

ISRAEL Jerusalem

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ChristianM,
yes the chip should be as you said.. and as you see in the picture..
(on the lower right..)
if the servo don't respond to the sensor it's 2 things..
or the Chip is bad (replace it) or the resistors looks like soldered but they are not!!!! one of the resistors sending the Power for operating the MAX1241 and another one also make the signal from the sensor get into the MAX1241 !, so before you change the MAX1241 check all of your soldergins... i recommend to you go over all the sodergin with your solder machine.. just soder it again!
let us know how going on...

**Raptor 50SE, GY601, Futaba **

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10-19-2005 06:07 PM  13 years agoPost 220
StevenTodd

rrNovice

New England

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Bllade,
I see what the problem is. It's right on your workbench.

Take a look at the picture and you'll see a coffee cup w/ a cartoon character on it. I bet you did this work on a caffine free day.

-s

p.s. If Collective's gyro was in some major crashes, he may have a hairline fracture on the board or even a partially broken connection to any one of the SMT items.

Just my thought.

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › GY502 Converted to GY601 - Test flight = success
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