Remove the dial knob, unscrew the 2 screws on the back bottom of the radio. Subject: Mars/Cap modification for Alinco DJ-175
In this Edition, you will find a list of all the new & updated articles now on our site. It only comes out every 2 or 3 months.ĭear Lee Besing, this is the mods.dk newsletter. If you find it interesting, please visit their website and sign up for your own copy. Many older HF rigs won’t go there without a mod, like the ICOM 706MKII-G, etc.Īnyway… Here is the newsletter I just received today. But there are legit reasons for being able to receive or transmit out of what was “normal” when a rig was built, such as the 60 meter band that was recently opened for hams to use (few years ago). Of course, I’m not trying to encourage anyone to make illegal mods, or to use their transmitter in an illegal fashion. And if you wanted to modify a radio, but didn’t know how, they usually have the instructions.
ICOM IC 7800 MODS MANUALS
I’ve found lots of hard to find manuals for obscure radios, or current radios. While the site is hosted in Germany, the site is written in English. While NOW, sadly, an obsolete part, the 40673 Dual Gate MOSFET was a very common and easily available device in the 1970's, when Heath was still around, and also used in many ARRL Handbook projects from that time period as well.) The practice is still widely used, since most manufacturers of electronic items consider them "not repairable" or "no user repairable parts inside.Dear Fellow Hams! Just in case you were unaware of this free source of information about ham radio hardware “fixes”, I chose to share this recently received electronic newsletter from to which I subscribe. (For example, a HeathKit with a Heath Part # 417-240 is actually an RCA 40673 Dual-gate MOSFET. Even HeathKit was a party to this ALL (or almost all) of their semiconductors included in their kits had only "house numbers." Fortunately, (and gratefully) Heath DID provide regular (1Nxx, 2Nxxx/2Nxxxx, etc.) component numbers in their manuals for most items, so repair/replacement was made easier than just using "guesstimates" for replacement parts. Not necessarily a result of "relabeling." Not just Futaba, but a LOT of semiconductor manufacturers would originally use "house" numbers (specified in their contract) on a run if the client so requested. If you need the schematic, my email on my qrz page is good.Ĭlick to expand. Just like ok2zaw, if IC2 is bad, I will have to find another solution as I can't locate that chip. I'm getting 322 volts DC into the circuit so I believe that all of the circuits in the previous circuit is ok as well. I tested all of the other resistors and diodes in that circuit and they all tested good. I'll replace the 2 resistors and transistors and see what happens. I've ordered the K3505 replacement transistors and they are supposed to arrive on Monday. I believe what he is saying is that he is not getting a gate drive signal from IC2 driver. He does not state in his write up if he checked it or if it was bad. This is a 2.2ohm resistor feeding the gate of Q6. My R39 also looked fine but tested open as well. His R40 is fried but mine looked fine, however mine tested open (10Kohm).
ICOM IC 7800 MODS CRACK
One transistor has a crack and is shorted on all 3 pins and the other is physically ok but shows open across all pins both directions. Mine has both Q7 and Q6 bad just the same as ok2zaw. I've found some errors in it but as far as the connections it has been accurate. It's not perfect but better than nothing. I did find another thread and sent an email and received a schematic from another ham. I have the exact problem as shown on the webblog by OK2ZAW.
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