tristar 727

Anonymous · Post by **Anonymous** » Thursday 20th Jul 2006, 11:25

Hi new here can anybody help i noticed after sticking in a new output transistor that 1 of the cans is missing a core screw is this ment to be if not where can i get replacement its the L1 can green top

zodiac · Post by **zodiac** » Thursday 20th Jul 2006, 11:41

Mack,
I can't remember what can it is but there is one of them at the front of the radio that doesn't have a iron dust core. If the radio works OK without it don't bother about it.
Dave.

Anonymous · Post by **Anonymous** » Thursday 20th Jul 2006, 11:47

Hi dave well the rig works on rx side but no tx the needle jumps up and drops down when i key the mic i just put new 2sc1969 transistor in so dont know what the problem is

zodiac · Post by **zodiac** » Friday 21st Jul 2006, 12:37

Mack,
Check the final (1969) to see if it has any voltage on it's collector pin, that's the centre one when you key the mike. That radio has three power setting and as you switch from low power to mid then high the voltage should go up to about 13v in the high position. Let us know if it does.
Dave.

zodiac · Post by **zodiac** » Saturday 22nd Jul 2006, 3:11

Mack,
If there is no voltage at the collector of the final check D16 to make sure there is voltage there with the power switch set to the high position. D16 is in front of the transformer.
Dave.

Rick · Post by **Rick** » Saturday 22nd Jul 2006, 3:54

It sounds like no output from PLL maybe the VCO is not locked.

Rick.

Anonymous · Post by **Anonymous** » Tuesday 25th Jul 2006, 11:13

ok checked the voltage on middle pin on 1969 the voltage jumps up and down does not go near 13 v so do u recon i need new pll

zodiac · Post by **zodiac** » Wednesday 26th Jul 2006, 2:32

Mack,
Did you check D16 and is it working OK ?.
As for the PLL there are two different PLL's fitted to the radio what's yours as i might have a used one in the scrap pile.
Dave.

warhorse · Post by **warhorse** » Tuesday 15th Aug 2006, 15:58

Hi mack1279 going by the diagram and ive owned many of these rads a quick cheat solder a piece of wire to the Ariel sckt and work back wards looking at your power meter and like the gentlemen say check to see at what stages there is any out put via the voltage meter i found in the past that on this radio this method works quite well and the problem is either L13 OR L15 that you need to change . this method dont do on other radios because its only a quick determination if the fault lies between the driver and final pa stages. ps insulate the wire as you dont want to get any rf burns from the 10 watts. They hurt like hell.ooch..dirty method indeed'.'

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tristar 727

tristar 727

tristar 727

tristar 727 no output

tristar 727

tristar 727