- #Icom serial number check install#
- #Icom serial number check mod#
- #Icom serial number check manual#
- #Icom serial number check code#
#Icom serial number check code#
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#Icom serial number check mod#
Please, feel free to comment with me this mod and your experience, if you attempt it.Apple iPhone / iPad Carrier Checker by IMEI - Full GSX report - Fast service onlineĪpple iPhone Carrier check by IMEI(Next Tether Policy) Fast Service onlineįull Phone check + unlock options will be provided onlineįull iCloud Check + unlock options will be provided onlineĪpple iPhone / iPad Carrier Checker by IMEI - Full GSX report - Slow service onlineĪpple iPhone Sim Lock/Unlock Checker onlineĪpple iPhone/ iPad Sold to check by IMEI 100% onlineĪpple iPhone/ iPad Sold to check by SN 100% online I have not yet checked spectral purity of this mod. I will post more info if I work further on the set. This is so far the only problem I have found and, from a completely dead PA, it is still a great advance. Once I did it, I checked and got these results:Īs you can see, there is some lower power than expected at VHF and UHF.
#Icom serial number check manual#
I followed the Service Manual to set bias for the power amps. This is the final result, once all transistors were installed:Īnd this is a general view of the final amp, once refurbished: In the V/U transistor, I moved a bit the ceramic capacitors in the output side: I marked them with a pencil, cut them and, after aplying thermal compound, fitted them one by one: The new units have longer legs so you need to cut them.
#Icom serial number check install#
It was the moment to install the new transistors. I resoldered all the suspicious joints, once I had checked the components measuring them and finding them to be fine: I carefully filed one hole (V/U transistor):Īs I commented, you need to redo one track in the V/U transistor area: So, once you know what to care for, this is what I did. This is another item you need to care when filing the HF transistors holes, one of the biasing pots: There is no need to do anything else except be careful with the surrounding components, as in the HF transistors area, there is another track which will be filed, but it has no connection, so there is no need to reado it. You will need also to relocate one ceramic capacitor in the top side, from the original position: Here is the original condition of the hole, looking from the bottom side: For the V/UHF transistor, there is a track which you will remove and need to be redone. WARNING: before you start to emulate this work, there are some things which should be considered. So, after removing the finals, I decided to go the hardware way, modifying the PCB so the larger transistors could properly fit. This is the PCB once I removed the charred finals:Īnd this is the metal case, once I cleaned the goop. This is what I found in this poor abused rig:Īnd once I got the final amplifier PCB out. I installed what owner had provided (three RD70HVF1) but if you buy them, get a pair of RD70HHF1 and one RD70HVF1, as Icom originally mounts on new PAs Someone had already fitted new transistors in the old PCB but without any modification, so they were pressed by the PCB and, judging by the condition of the unit (see pictures below), it was not a good idea. Well, in this case, I had got a damaged unit to repair, along a new set of transistors (provided by owner all of them were of the same type, RD70HVF1, but they seem to work fine at HF/50 also). Most of the information I could find told that it was not possible to go this way, due to electronic differences among the new and old transistors. I document this repair because I was unable to find a complete final amplifier repair using new transistors in an old PCB. SRFJ7044 are obsolete and almost impossible to locate, so only solution so far was to buy a new PA BOARD from Icom. These transistors have a diferent case and can't be fitted to the old PCB without (at least) some physical mods. When they become obsolete, at about serial number 15xxx, Icom modified the final amplifier to use new devices, the (now) common RD70HHF1 (HF/50) and the RD70HVF1 (VHF/UHF). First units, used Motorola SRF-J7044 MOSFETs. There are two types of final amplifiers for these rigs. This page is devoted to the repair of an ICOM IC-706 MkIIG final amplifier. EB5AGV's Workbench: Icom IC-706 MkIIG final amplifier repair A new life for old-type power amps
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