![icom 756 pro ii headphone jack type icom 756 pro ii headphone jack type](http://www.mods.dk/mod/icom/ic-210-4sch.gif)
Not a lot of fun to get to but your almost there. Then check pin 4 to 5 through 10 just to make sure.
![icom 756 pro ii headphone jack type icom 756 pro ii headphone jack type](https://m.media-amazon.com/images/I/51szA+DjOHL._AC_SX522_.jpg)
I don't remember if you can remove the Plug J1 on the Phone Board (been a long time since I was inside of one) With the radio turned off and power removed you can check Pin 4 to PIN 5 through pin 10.
ICOM 756 PRO II HEADPHONE JACK TYPE PORTABLE
They are the perfect solution for any portable environment where grab and go is important. Pro2 Rack Systems are lightweight, yet robust. Each rack includes built-in speakers These rack systems offer compatibility with radios from most manufacturers. Operation is sub- ject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. iPortable Pro2 Equipment Rack Systems are designed for portable communications and fieldwork. Probably ground at PHONE PCB is not making. Frequency range: TX: 10-160 m + WARC/50-54 MHz. This device complies with Part 15 of the FCC rules. If not the line called PHNI stops audio from reaching the ext spkr and interal spkr. Pin 4 must be grounded through the switch on the Headphone jack. From there it goes to the ext phone jack on rear.īUT If you have headphones plugged in the ground is removed from J1 pin 4 which stops audio from going to the ext phone jack. Thanks again for taking the time to read this, and help. I am tempted to check a few components, but last time I went off on my own, I smoked a component.so I'll be patient and wait for guidance this time!!! The paint finish is a rough ' fingerprint proof ', flat black. The ' stamped ' in ICOM logo on the top cover, is a nice change, but must have been abit of an expense to tool up for. I see in the schematic there is AFO, and SSP, but I don't know what they stand for, so I'm not really sure when R元51 coil is energized or not.Īlso, if anyone does help explain how R元51 is energized, it would also be really helpful if you are also able to explain where I should probe next. The IC-756, is a handsome looking rig, with a nice finish. If I have that right, I'm not really sure what switches that relay. Your ICOM is probably mono (check the manual) and it should be safe plugging a stereo plug into it. If I have it right, after branching off to the phones board it goes through D351, Q351, and R351. The part in your hand is the plug, you plug it into the jack.Stereo plug into a mono jack is alright, but a mono plug into a stereo jack will short the ring (middle band) to ground, which will short one of the stereo channels to ground (The HP1 is an example of stereo jacks on the headphone and line out). It seems like the audio signal goes from IC332, first to the Phones Board, then the ext speaker jack, and then the internal speaker. I "think" I have an idea where to look, but I want to make sure before I make anything else go POP. Ok, good news is I now have signal at IC332, pin 4, and the headphones jack works!īad news is, the internal/external speakers both are not working.