Modifications for the ICOM - RogerK

19-07-1998(IC-765) Icom IC-765 Passband tuning mod1. Dessolder and lift cathode of D63 from PCB.2. Add a 1N914 diode to the junction of the 1N914 cathode and the D63 cathode.After modification: If shift button out = pass band tuningIf shift button in = if shift.Date: 28-01-2002 User comment From: Carl Severa, AH8ISubject: Icom 765 Passband Tuning Mod (addition of)Your PBT modification for the IC765 is not complete.Please refer to your source and read what is on your website.I do not have it or I would give you the correction.Carl SeveraThis modification is read 1126 times.top of page19-07-1998(IC-765) Mod to prevent ant sw unit failure1. Remove top cover2. Locate ant sw unit at right rear of radio (at antenna jack).3. Solder a .0047 uF, 500v ceramic capacitor to back side of pc board as shown. (Board removal is not necessary).4. Reinstall top cover and check for proper transmitter operation. this modification prevents failure of R1, R2, D1 and L1.-------------------------------------- Top edge of board/0/ Rear panel of radio---->I----0 /__I__ /.0047uF /0_______________0--I-- 0 /0/I ________________________ / /I------0________________________0 / // //0/View: back ant sw unit pcb.This modification is read 984 times.top of page19-07-1998(IC-765) Adjustment the mortrs control unitThe feedback circuit that controls the tuning motors becomes sensitive after a few months of ageing. It requires a one timeadjustement to correct.1. Remove top cover and locate the antenna tuner board.2. Locate r5 and R10 and set them to the center of their range.3. Set radio as follows:Tuner onFrequency 14.100 MHzMode RTTY