![icom 756 pro ii problems icom 756 pro ii problems](https://i.ytimg.com/vi/2GmPvjG-E8Q/hqdefault.jpg)
I basically hold the part down with a small screwdriver and tack them down with the iron and lots of flux. The flux is the secret to not vaporizing parts.
![icom 756 pro ii problems icom 756 pro ii problems](http://www.w1aex.com/756AM/756scope.jpg)
Some plastic got nicked but in the end a miracle happened and the radio works top notch now.ĭont try this without flux. Maybe Yvo and TRX and Mike have all the fancy equipment to make this easier but I dont so some stuff is crooked and difficult to get to.
Icom 756 pro ii problems mod#
I put in 2 new 100ohm's and Replace C802 that the mod said to remove also. The problem with the CI-V bus are many making for a very fragile system.
![icom 756 pro ii problems icom 756 pro ii problems](https://s2.studylib.net/store/data/018694628_1-e1ebdf308a4cacd107482c76dcfb6dd9-768x994.png)
Icom 756 pro ii problems serial#
If you have a PW-1 you most like think it is a good amplifier but a lousy client on the CI-V bus, the single wire serial communication bus that runs between ICOM equipment. I fucked up and was supposed to bridge 802 and 803 and after going over it all again, tore back into it again today. THE PROBLEM: I am the owner of an Icom 756 Pro II and the PW-1 KW. When I first read this mod I thought it said jump R802 and R803 to 0 ohms so I swapped in 0 ohm smd's and put it all back together and the low band was still dead. Now these chips are under the bpf board and I just did't want to chance removing it again.
Icom 756 pro ii problems full#
I looked online and found a mod that allows full signal in the low band and it effectively jumpers out the burnt R801 so I thought thats half the battle right there. That was after pulling the preamp board off to get to anything. I started chasing the schematic and determined I didn't replace D802 and figured it was popped.
![icom 756 pro ii problems icom 756 pro ii problems](https://i.etsystatic.com/7582153/r/il/15f6e8/2755034900/il_fullxfull.2755034900_hsj9.jpg)
This is caused by a loop-back from the antenna relais (TX/RX decoupling) via the RF board, passing the persistently switched input attenuator (2 relais) and the RX/TX isolator diode D131. We considered using a 7808 regulator, fed from the 14V rail to power the audio channel, but that’s more complex than the single 1000♟ cap, and poses. There is no room to contemplate installing the changes in the PRO. While I was doing the work, I modified the 756 to add the use of the 60m ham band to it's range of transmit frequencies.Everything else worked. Icom IC-756 PRO (IC 756 PRO IC756PRO) 6M oscillation problem: Some IC-756PRO (-2) tend to oscillate on 6m. The IC-756Pro II decoupling components are changed in both the NB and the audio stages, and are larger than those in the PRO. Wow.was I ever relieved to hear this!īob and I worked the deal, the faceplate assembly from his 756 arrived at my doorsteps this morning, and it's already on the rig and looking good as new. I was about to send the front of my rig to him to have his new display kit installed (I couldn't possibly handle all the SMD soldering and such), when I got a message from Bob wa8ulw stating that he had an old 756 that had been struck by lightning and that it had a good display. In recent years, a ham Richard Rosenberger PA7FA in the Netherlands designed a replacement display for it. I continued to put up with the problem, and it continued to get worse and worse.to the point where I could almost not read the display and had to rely on HRD and a CI-V interface to read some functions and frequency on the computer in the shack. They came out with the Pro-series 756's, and had no displays for the repair of the $2500+ radio I bought in '95. The 756 does not suffer from these close in signal handling problems, so therefore it represents good value for money for the performance and technology it. It has been a great radio, except that the display began to fail a few years ago and Icom would not support it.