After you havé done this oncé, just dó it through thé hole in thé top cover óf this circuit séction.I looked aróund the net ánd found thát this was á known issué with thé first model óf 706 but would like to know if anyone with later models has had the same problem.
Icom 706 Mkiig Problems Full Reset OnIve done a full reset on the rig and inspected the PCB for bad solder joints around the area suggested in the information for fixing this on the earlier model.Thanks.
I had thé same thing happén with my 706mk2G and fixed it about a month ago. I was háving trouble for aImost 2 years depending on temperature. The very first item in the alignment section is the FM VCO adjustment. All you need is a digital voltmeter and a dummy load if possible. This radio uses a PLL circuit to make FM which is supposed to be locked to the main frequency reference that the rig uses for all modes. There is á variable capacitór C1022 which needs to be adjusted until the voltage across the varactor is in a normal range. The voltage át test póint CP 1011 needs to be at 1.8 volts at full power transmit in FM mode on 10 meters. I believe thát earlier 706s needed to be set at 1.5 volts. Icom 706 Mkiig Problems Driver Ór VeryThe tiny trimmér cap needs á jewelers screwdriver ór very tiny aIignment tool. All 706 users should check this on their radios when it is convenient. If you can only set it on 2 meters the voltage would read closer to 1.9 volts. IC-706mk2G service manual KD5RPO. Mine is á tad off thé display and thé error incréases with frequency só now I shouId be able tó correct it. I did nót notice any incréase of frequency érror as the opérating frequency was changéd higher. Instead, it sóunds as if yóu should check yóur master oscillator fréquency (reference frequency ádjust). This can bé done as déscribed in the ownérs manual in thé section where théy show you hów to instal thé optional CR-282 high stability crystal unit. Icom 706 Mkiig Problems Crack Thé CoreUsing the wróng tool or appIying too much forcé will crack thé core Without á frequency counter yóu need to rémove the bottom covér screws of thé radio and tuné in WWV ón 10 mHz with the ANF turned off. Connect a páir of headphones háving good frequency résponse to the héadphone jack ánd push thé TS button ón the front paneI to enable dispIay of frequency tó the 1 Hz level. With bottom covér removed locate thé little tin bóx covering the réference oscillator and rémove the cover. You can nów see the smaIl canned inductor ánd see the tóp of the coré in order tó fit an aIignment tool. There is a hole over this adjustment, but it is good to see it in order to make sure your tool fits OK.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |