Hi there,
I got this reply from Himodel. Hope the info is useful.
''The factory did not recall this item, also not all transmitters need to make any change, only very rare types of transmitter which have a unusual high PPM output is suggested to add a diode to reduce the output voltage, the types listed below are confirmed with standard output, and no need to make any change:
Transmitter Module is compatible with the following transmitters:
Futaba module: Futaba: 3PK, 3PM, 7U, 8U, 8J, 9C, 9Z, 10C and FN series.
Hitec: Optic 6, Eclipse 7.
WFLY: WFT09, WFT 08.
JR:347/388/783/U8/PCM10/PCM10S/PCM10SX/ PCM10IIS/8103/J9303/MX-22/MX-24S/PX/9XII
For transmitter types listed above do not need this part, only some special type radios (very rare on market) which the single output is different to conventional radios need this part)
Put it simpler, some types of transmitter (some un-popular brands) have a higher voltage in the signal output, to avoid over voltage/current of the module, they add a diode to reduce the signal voltage, that is all, also, if your transmitter is not the standard output, then it may even affect the function of the module if you add this diode to it, as the signal is reduced once add that part.
Also, the diode is a very popular and common part, normally cost about 0.01USD each, and can be found on any electronic components market, the type of the diode the factory provide is 1N5819, also you can use types BAT85, BAT54 or SS14, etc. (or any other types similar to the mentioned types)
For wiring diagram, refer to http://www.himodel.com/en/service/uploa ... 2971_1.bmp ''