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

i have a cobra 148 gtl, 8719 pll, pcb# ept148112, this radio was made in malaysia in 1995. i have no receive, no transmit on am & ssb. no in coming signal. no movement on the meter. the red & green lite doesn't come on. the pa works, i hear audio when i talk into the mic. I didn't do anything on this radio so far. i would appreciate if someone can give me a hand with this radio. galaxy

hi ,,sounds to me like the pll,is out of lock.check your lock detector.

Sounds like IC4 (MB3756) is dead, also check TR35 (2SC945) and D55.

Rick.

thank you for your reply. i changed ic 4 3756, tr 35, d55 still no luck. galaxy

Ok then what is the voltages at IC4 Pins 1,2,5,6 and 8 in RX and TX.

Rick.

thank you, rick i burnt the trace this one is junk.... i will try a different radio? galaxy

dont junk it you can solder you a wire from where the trace burnt to the end of where the trace runs kinda like running a jumper wire