KRAFT series seventy two 6CH RC Transmitter - UK Vintage Radio Repair and Restoration Discussion Forum

techbill · 28th Jan 2011, 1:47 pm

Dear Friends
Recently a friend of mine gave me the above mentioned RC transmitter for alignment after tampering with it's insides.
He says it was working OK before he decide to install a new 3s (11,1V) LiPo battery pack.
I checked output power and frequency and they are OK but as I found out he did rotate the pulse width adjustment resistor pots (7 of them).
So now I have to realign them in order for the associated receiver to be able to output the correct servo channels.
I do not have a service manual or circuit diagram.The PCB is has transistor multivibrator for creating the 20ms frame and subsequent pulse delay sections(contolled by the pots).
I slightly adjusted back and forth some of the pots but with no luck.
Anyone having any info that I can use?
Bill

28th Jan 2011, 1:47 pm	#1
techbill Retired Dormant Member Join Date: Jan 2011 Location: Thessaloniki, Greece. Posts: 1	KRAFT series seventy two 6CH RC Transmitter Dear Friends Recently a friend of mine gave me the above mentioned RC transmitter for alignment after tampering with it's insides. He says it was working OK before he decide to install a new 3s (11,1V) LiPo battery pack. I checked output power and frequency and they are OK but as I found out he did rotate the pulse width adjustment resistor pots (7 of them). So now I have to realign them in order for the associated receiver to be able to output the correct servo channels. I do not have a service manual or circuit diagram.The PCB is has transistor multivibrator for creating the 20ms frame and subsequent pulse delay sections(contolled by the pots). I slightly adjusted back and forth some of the pots but with no luck. Anyone having any info that I can use? Bill