HUM MOD

remove       r1407  2.7 ohm 1/2w resister,   L1016 afc coil.

add          2sd667c (g3406670c) transister,  560 ohm 1/4w (j01245561)
             resister,  22uf 25wv (k40149025) cap


at L16 on the if board  remove coil L16 and resister r1407

(1) connect the brown wire from r1407 to the new 560 ohm resister.

(2) connect the "+" side of the cap and the base of the transister
    to the other side of the 560 ohm resister.

(3) connect the collector & the emitter of the transister to the two
    points on the board whare you removed coil L16.

(4) connect the "-" side of the cap to c290 on the board.

(5) add a jumper wire between the collactor of the transister and the
    brown wire on the 560 ohm resister.(i used the trace on the board
    for the connection at the collector)

that's it.  HAVE FUN.

"73"------jerry n7vbt @ n7ent.wa.usa.na







 ***  found 1 messages of 2551

 Msg# TSF  Size #Rd  Date  Time From   MsgID        To
32997 BF   1875   0 12-Jan 0721 N7VBT  10518_N7HFZ  ALL@USBBS ()
 Sb: FT-767GX HUM MOD 1/2



HI:
name here is jerry, if your 767 has a hum there is a mod that you can
install on the if unit that will take care of this. it is not all that 
hard to do once you find the right place.


you will install a ripple filter to the audio amplifier power supply.

first to test to see if you need to do it.
(1) connect a dummy load 
(2) disconnect the mic
(3) turn on the if monitor 
(4) push in the "mox" button and listen if you here a hum you need the mod
 note:  you can also plug in the mic, if the hum get's worse do the mod.
        you can here it in any mode or band, hf, vhf, uhf.


i called yaesu to git the info for the mod and then got the parts from
them. the cost to have them do the mod would have been about $85.00 +
shiping, at first the parts wore going to cost a hole $1.55 w/shiping
but thay gave them to me so the price was right. 


continued.      n7vbt @ n7ent.wa.usa.wa







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