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

Sorry for that, but checkout these two things and then you see more. If the diodes are blown there is a reason, but you can experimentally exchange them with 1N4148 or 1N4001. Then you can make more messurments, before trying to geht those MV1Y, which will be hard to find...

Hi,

must say, I don't know the ar 3500, just read the shematic I found on the web. The SB 754 (Q35) must be a big one, screwed to the chassis with the upper edges cut off at 45 degrees. Normally it is not very far away from your power-inlet. I it is the one, you can change it to the higher-rated ...

Hi,

which model: the 30 Watts or 150 Watts? Wich seal: The seal of your dealer/tech or the original "Ranger"-Seal?

On the 150 Watts it COULD be, that the Driver is killed, so you are running on a low-driven Final-/Amp-Stage.

30W-Model seems to be OK so far and needs a re-adjustment arund driver ...

Radio Make and Model: President Lincoln
PCB Number: PB111AE (1999 Uniden)
PLL Number:
Test gear available: Conter, Oszi, DMM, PM...
Symptoms: Driver-Bias running high

What is working: everything else

What has been tried: Bias-Diodes, Bias-Circuit, PCB-Faults

Did it suddenly happen ?: Got it that ...

Hi,

first: how much AMP does it draw in Standby? Is it > 0,5 Amps (1, 2, 3 or what): checkout the Final and Driver. They could short-out and then the receiver also can go "dead" (this often happens in several rigs, when the final is "killed").

Second: Try to make the VCO/PLL-Allignment. Its not ...

Hi again,

I now changed the AN8005 with a descret LM7805 to see, what happens. First was: the supply-voltage of the 7805 drops from 13,8 to 6V, so this may be the reason, why the AN8005 will not work probably. I now wired the input of the 7805 to the mainswitch-out and get 13,8V on input, 5V on ...

Radio Make and Model: 2950DX
PCB Number: EPT695014B
PLL Number: sorry, haven't figured out yet
Test gear available: Counter, Scope, Digital V/A/Ohm, ToneGen
Symptoms: Blank Display

What is working: Rattle in Buzzer

Hi,

prior to hanging my iron into those SMD, just one question: is that AM8005 on ...