Search results

Thanks for clearing that up and extra detail on parasitic diodes. I've been looking at those cheap fleabay chinese component testers for a while now. Ill buy one shortly because I need that for capacitor testing as well. My cheap DMM can only read up to 20uf... Rob

@brandon7861 Thankyou so much mate for your help. Sorry for the delay in reply. Just been very busy on other things the last few weeks but I had to come back to tell you: Today I finally changed VR8 Driver 500ohm trim pot and the radio is up and running, I now have TX output!!. My first...

Thanks for the replies, I'll start working through your tests. @brandon7861 I am using Diode mode on the DVM, the C1306 is showing open between collector and Emitter when I have the black lead on collector (center pin) and red lead on emitter (right side pin). Swapping leads around also...

@brandon7861 Thanks for ideas. Still trying to work out with the 0ma driver bias issue. Tried below with no change: Lifted C215, no change. Tried cleaning and adjusting VR8, no change still 0ma. Position was 1/3 up from anti clock wise (1/3 far from most left). Replaced Driver 2SC1306 with a...

Forgot to mention. Checked radio for overall current draw while on external power supply at 13.78v On Receive: 270ma, AM transmit: 350ma, SSB transmit 440ma

@Dr Frankenstein Thanks for the detail on C149 and other schematic logic. I thought I may have seen dc volts or noise or something but after posted my online research showed RF as VAC and then I thought about it makes sense seeing D49 rectifies the signal for the front dc volt meter (signal...

Hey Guys, Thanks for the responses. @doffo I know what your talking about problems with the voltage IC, ie MB3756. All voltages are good in RX and TX on all pins. I had read about the high AM carrier problem which I'm pretty sure shows up as high voltages on MB3756. I can hear the radio key...

Thanks for the reply Nomad, on driver and final metal tab I'm getting: 13.13v on AM RX, 7.2v on AM TX 13.75v on SSB RX, 13.13v on SSB TX

Hi Guys, I bought a Realistic Navaho TRC490 recently from ebay as working on RX, but not on TX. Board is PC385AG ie same as Uniden Washington (MB8719), Cobra 2000 etc. Description was possible mic wiring wrong......mic supplied was wired wrong but I had a working mic to suit the 4 pin...