Talk to Norbert, oficial EU Service Center. I had the same problem with the fans of my 6300.
Norbert Wrede
EU Service Center
Habyer Str. 22
24361 Gross Wittensee
Germany
This MAY depend on the age of the 6300 of which Fans it uses and you may have to check with FLEX to see when they made the FAN change to the new type Fans and check your serial number of your radio and see where it falls.
My old 6700 takes the same fan as the 6300 does and I actually found them at Jameco Part no.: 2315535 back in 2021, But I'm not sure if there still available or not, here is the actual Fan's part number AP0512HX-J96.
With these you can simply remove the 4 screws holding the Fan motor and Blades on the heat sink and put the Molex plug from the old fan on the NEW fan wires with solder and small heat shrink and use the same 4 **** to remount it to the heat sink and plug it in.
These below are similar but it doesn't look like they have the RPM wire so probably won't work at all !
You can also send it to a FLEX service center, they have a NEW style of fans that can be retrofitted to the older radios, DON'T try to retrofit these your self because the original fans are Glued to the FPU and require specialized technics to remove them with heat and YOU CAN ROUIN your Radio very easily.
And, you need to be careful with fans as not all fans are created equal.
FlexRadio engineering spent a LOT of time on Fans when picking which ones to use.
The firmware monitors the Fan RPM and relates it to a cooling curve. This ensures that the FPGAs are cooled correctly.
Feel free to check with us.
Marco, I don't have a 6300 to measure, however I think you're going to find you do need a 12 volt fan. If memory serves me the FPGA fans are variable speed depending on the FPGA load / temperature. In many cases when you need a variable speed fan you drive it with a PWM signal. When you measure the voltage on the pin you want to use an oscilloscope set to 5 volts per division. This link: https://www.google.com/search?q=what+does+a+PWM+signal+look+like&source=hp&ei=gLrVY4uKD_TNptQP74Sx-As&iflsig=AK50M_UAAAAAY9XIkObApe3SuCBLmVllrlbv_z5uzjuI&ved=0ahUKEwiLyp3ov-v8AhX0pokEHW9CDL8Q4dUDCAo&uact=5&oq=what+does+a+PWM+signal+look+like&gs_lcp=Cgdnd3Mtd2l6EAMyBQgAEIAEMgUIABCGAzIFCAAQhgMyBQgAEIYDOgsIABCxAxCDARCRAjoOCC4QgAQQsQMQxwEQ0QM6BQguEIAEOggIABCABBCxAzoRCC4QgAQQsQMQgwEQxwEQ0QM6CAguELEDEIMBOgsILhCABBCxAxDUAjoFCAAQkQI6BAgAEEM6CAguEIAEELEDOggIABCxAxCDAToOCC4QsQMQgwEQxwEQ0QM6CAgAEIAEEMkDOgQIABADOgcIABCABBAKOgYIABAWEB46CAgAEBYQHhAKOggIABAWEB4QD1AAWLIxYMs3aABwAHgAgAHnAYgBxSSSAQYwLjMxLjGYAQCgAQE&sclient=gws-wiz#kpvalbx=_iLrVY9HeA5aYptQPuvu7mAI_39 has a good explanation of how PWM works and what the PWM signal looks like.
I hope that helps a bit.
Hi Marco,
I believe the system varies the speed by varying the pulse width. The way I think the speed control works without having a 6300 to verify is that the voltage is always 12 volts and the pulse width is varied to very the speed. This is why you have to use a scope to check the voltage. A DC voltmeter just isn't going to read the correct voltage of a PWM signal.
You may want to try this fan: https://www.jameco.com/z/AP0512HX-J90-ADDA-Corporation-DC-Chip-Cooler-Fan-50x50x8mm-5-5-Wires_2100371.html?CID=MERCH as a substitute. I checked Octopart and it looks like this is also an obsolete fan and Jameco is the last place in the world that has any in stock.
I dug through what I could find for old spec sheets and it looks like this fan has the correct dimensions with thickness(height) being the most important. If you're lucky the mounting holes for the fan will be the same between this chip cooler and the one(s) that are on your 6300. Short of having a very sophisticated rework station you're not going to get the old chip cooler and fan of the FPGA in one piece.
73 and good DX,
de Roger, NK1I
The Fans Roger suggested do NOT have the Speed wire so though they will physically fit they won't work with out the Speed wire, This is what the J96 suffix is for.
As Mike said way up on this thread the fans need to be exact part number to consider for replacements and not just a fan that will fit.
Any idea now that the J96 is deprecated what the new replacement model is?
My J96 has failed at least twice and been swapped out, and cannot be sourced.
Mike
G7TWC
At the end of story i tried to replace the fan with a new 5 V noctua fan
it is necessary to remove the frame and with double-sided tape i fixed the fan to the heatsink. at this moment the flex 63000 works and has never had problems even during the contests, when it remained on for 48 hours.
73 Marco
