Products > Test Equipment

FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator

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adeuring:
Got recently a second hand FY6800. One channel worked fine, the other had a terrible positive offset that made is practically unusable. (Forgot unfortunately to make a DSO screenshot before repairing the thingy...)

I suspected that the opamp driven by the DAC, an AD8009, (IC1 in DerKammi's excellent schematics, https://github.com/DerKammi/FY6600-15-30-50-60M/blob/master/Hardware/FY6600_Main_A0.pdf ) was broken and replaced it; now both channels work fine. Attached is photo of the old AD8009 (left) and the replacement (right). Note that the removed chip does not have the Analog Devices logo...



But before anybody concludes that Feeltech uses fake chips: (1) The device has an unknown history – I do not know who soldered the left opamp in the photo onto the board; (2) I am not familiar with the "pattern" used by Analog devices to label their chips – perhaps the left chip is genuine; (3) clones do not have to be worse the original…

Another oddity: The counterpart of the chip I replaced for the other channel (U10 in DerKammi's schematics) is an LMH6702MA, not another AD8009… But again: I do not know if the previous owner(s) of the device or Feeltech soldered this chip.

Thanks to DerKammi and everybody else who contributed to the schematic. Having it available made the repair really simple.

PS: I suspect that this thread and DerKammi's Github repo for the FY6600 can lead to a sort of addiction to the FX66xx. I bought it mainly for some audio measurements but after reading this thread I'm wondering if I shouldn't start too to tinker with this "sow's ear" ;).

rhb:
Hi,guys.  I finally wandered back for a visit after a long hiatus and am happy to see my favorite energizer bunny, the F***tech thread is going strong :-)

Naturally, I had to get an eBay update on FY6900.  One seller in the US is offering a 2 year warranty and “100% satisfaction”.

Naturally, rather suspect.

Is there any hope yet of replacement FW to fix my twice self-borked 6600?

HaveFun!
Reg

kaldach79:
Hi,
Do you know what driver is used in the generator display?
My LCD is damaged - grey backround, or only backlight. After freeze works fine by short time.
The original display has an 18 pin, but i have problem identifying the driver ILI9341 or ST7789.
Thanks for the help! :)

kaldach79:
Am updating my post. Display containing ST7789 driver chip, not working properly.The image is inverted, and the blue and red color are reversed.
I will try display with driver ILI9341.

hlj.pycad:
when I try to turn on the FY-6600 , it will show the brand icon "FeelTech" for a brief moment,  then the screen turn white. The keys seem still fuction. Any clue where I should look into?

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