deswong
10-27-2007, 06:24 AM
Hi Everyone.
I have just got a new DX7, 2 days old, and busy setting up my 450 yesterday.
Today's plans were thwarted though :( I turned on the transmitter today and although it appears to be working, the receiver lights on the receivers just didn't come on solid. They flashed and then stopped. The Gyro was still working so I thought the receiver must have become 'unbound' somehow.
So after 20 minutes or so of attempting to bind, nothing worked. But the back of the receiver got hot. Like, really hot... :(
What I found after pulling apart the receiver is that the LM2937 decided to deliver a nice 10.2V to the 2.4GHz part of the radio, and that was causing everything in there to overheat and not smell so good.
The voltage regulator seems cooked, on circuit it was giving a 1.45V output on the output line, but the board got incredibly hot really quickly.
So I took out the voltage regulator, debating whether to claim warranty or not.
I was going to do the Dimension Engineering mod on it, and then tested the unit with a known 3.3V source to ensure the radio was still working, which it was, thank goodness!!!
So I have done the DE mod and it seems to be working ok.
Is there anything else I should look out for after this experience? I can't find any evidence of a short or other parts that are pointing to where the problem started from...
The Voltage regulator is dead - just puts out what voltage comes into it.
How do these just 'die' like that? Is that common? Or a short somewhere else could have caused this?
From what I can tell this takes the voltage directly from the battery/switch and the first component it goes into is the voltage regulator. So my 'assumption' is that now the unit will be okay.
I have patiently been waiting 6 weeks for my DX7 to arrive from the USA, and don't really want to have to send it back for warranty service if I can avoid it.
Suggestions, comments?
Des.
I have just got a new DX7, 2 days old, and busy setting up my 450 yesterday.
Today's plans were thwarted though :( I turned on the transmitter today and although it appears to be working, the receiver lights on the receivers just didn't come on solid. They flashed and then stopped. The Gyro was still working so I thought the receiver must have become 'unbound' somehow.
So after 20 minutes or so of attempting to bind, nothing worked. But the back of the receiver got hot. Like, really hot... :(
What I found after pulling apart the receiver is that the LM2937 decided to deliver a nice 10.2V to the 2.4GHz part of the radio, and that was causing everything in there to overheat and not smell so good.
The voltage regulator seems cooked, on circuit it was giving a 1.45V output on the output line, but the board got incredibly hot really quickly.
So I took out the voltage regulator, debating whether to claim warranty or not.
I was going to do the Dimension Engineering mod on it, and then tested the unit with a known 3.3V source to ensure the radio was still working, which it was, thank goodness!!!
So I have done the DE mod and it seems to be working ok.
Is there anything else I should look out for after this experience? I can't find any evidence of a short or other parts that are pointing to where the problem started from...
The Voltage regulator is dead - just puts out what voltage comes into it.
How do these just 'die' like that? Is that common? Or a short somewhere else could have caused this?
From what I can tell this takes the voltage directly from the battery/switch and the first component it goes into is the voltage regulator. So my 'assumption' is that now the unit will be okay.
I have patiently been waiting 6 weeks for my DX7 to arrive from the USA, and don't really want to have to send it back for warranty service if I can avoid it.
Suggestions, comments?
Des.