The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Hi all..im new here and im also coming from the Netherlands ( Europe)...so please forgive me when i write something wrong in english.

I have here a Stalker XX main board PC-411AD with the MB8719 PLL inside.

I can recieve on ALL modes but cant transmit. RX led is switching of when i push the talk button but TX is not switching on. So its also not transmitting.

I need a technical manual or a copy( digital) so i can fix this old radio.

i have searched well on internet and its hard to find something about this radio.

Can somebody help me here ?

Best regards ...

It sounds like IC4 (MB3756) has failed, check the voltage on pin 1 it should be about 7.5 to 8 volt in TX if not replace IC4 but first check that in TX pin 5 low to about .5 to 1 vdc if not check mic wiring.

Rick.

Rick wrote:It sounds like IC4 (MB3756) has failed, check the voltage on pin 1 it should be about 7.5 to 8 volt in TX if not replace IC4 but first check that in TX pin 5 low to about .5 to 1 vdc if not check mic wiring.

Rick.

i will check it and let you know... i have also checked the voltage on the TX led and there's zero voltage on tx..led is ok ...i hope i can found it because the radio looks lovely and i hope somebody send me also the technical part... on my personal you can see my email account... or push the email button..thx for now

Did you fix the problem, if so what was the fault, as it may help someone else.

Rick.