Hi Bob, glad that the video was helpful and you was able to fix the radio. Have fun with your new stuff..Thanks for stopping by 73

Very appreciated! Thanks for watching 73

Thanks for watching. 73

Thanks for watching Roy 73

Thanks for the feed-back Jose 73

Thanks for watching, glad that it was helpful for you 73

Thanks for watching Eduardo! 73

Glad that you like it Buddy. Yeah from time to time we have PLL issues but very often a missing voltage only. Sometimes a bad cap in the loop filter but this is different. Thanks for watching my friend 73

Thanks for feed-back 73

glad that you like it...Thanks for watching 73

Thank you Adnan 73

Hi Mihail, yes a preheater is differnt way to do it. I prefer the method of carefully heating the pcb up with 300°C and than increasing the temp and going down to the ic.. Thanks for watching 73

Thank You 73

Thank you Mike, yeah PLL faults can be tricky 73

Vielen Dank Peter, auch für dich ein schönes (Rest)-Wochenende 73

Thank you

Thanks for feed-back Brian. It is a honer to get this nice grading from a professional like you are! All the best and 73

Thank you Jim 73

Thanks for watching David 73

Thank you Dino, glad that it was of any help for you! 73

Thanks for watching David 73

Thank you Allan 73

LOL yeah he really has to bite the bullet..Thanks for watching 73

TheDefpom At some point I am going to do one to. Got a parts radio here tha has a separate synthesizer module in it that works out of radio. Its old school 4000 and 7400 series TTL and CMOS. Figured that would be nice to use so I can demonstrate individual circuit functions. Hard for some people to understand all the circuits used in single chip PLL's.

MikesRadioRepair - I guess there will be an influx of PLL theory then ! Between the 3 of us we should have it covered from all sides 😃

TheDefpom The more the better. :)

There are so many additional aspects around the PLL which are not covered in this video so much more to do for all of us :-)

If the owner deicide for a repair I will do. Thanks for watching 73

as long the shorted dds is not back in place I have still the unlock. so that is the second step. 73

Thank you Pasquale.. Cheers and 73

Yeah a second cam would be nice but this video production is a one man show and it is additional to my normal workload..73

Thank you Dennis. Well the board is approximate around 250 bucks...73

Hi Herbert, may be but the owner don't know. The last visit before it came to me was ICOM Europe. So all is a bit odd. Thanks for watching 73

LOL ah you are the one :^) Thanks for watching 73

Even more …all CW stations has no tone in audio just keyed noise…

Yeah bad came positioning..sorry for that but it is not much missing. Thanks for watching 73

you're wellcome.. :D

If I would have guessed that an over voltage occurred to the radio I would have mentioned it. The voltage regulator is directly connected to the switched 13,7V line. If we would have had an over voltage to the input we also would have had an over voltage to other components i.e. on the main board and not only this voltage regulator would have been toasted...

What I am saying is that at some point the 5 volts went to 13.8 volts on that board. If you will notice, resistors R291 and R292 have both been replaced, they supply power to the 7805 regulator chip. The schematic indicates they should both be 22 ohms not 220, unless of course the 0 means zero zeros. The 7805 has probably been replaced as well, . Also note that 2 chips have failed supply chokes, one open and one at a high resistance. High current has gone through both inductors, it is very unlikely that both chips had internal failure at the same time. A voltage higher than 5 volts has been applied to both of them. It is very rare for a 7805 to short and allow its input voltage to show up at its output, but if it got hit with a high enough transient, it might. However, such a high transient would have destroyed a lot of the radio, maybe it has. if 13.8 volts is applied to the output of the 7805 without 13.8 volts on its input, it will smoke. Consider the possibility that someone may have applied 13.8 volts to one of the accessory jacks on the back allowing it to somehow get to the 5 volts on the PLL board.

LOL yeah not recognised the button..

Hm not sure I understand what you mean David 73

i'm trying hamradio

Ah okay you will manage it no problem 73

yeah the golden screw driver never disappear lol Thanks for watching 73

Let's see what the owner is going to do.. 73

Aliexpress?