142 gtl strange issue

[Handy Andy]

Will try it today as I’m very busy with work

There's a lot to "unpack" in those posts, take your time - and be sure - DO NOT KEYUP Radio - you'll damage the Signal Generator and the radio - so exercise caution and service care guidelines

 

[kaos513]

Ok will be on the bench will report back

 

[kaos513]

So far the 7.800 mhz works

 

[kaos513]

Here is the update : found 3 transistors backwards strange but reverse them will update tomorrow

 

[Robalo]

found 3 transistors backwards strange but reverse them will update tomorrow

what's the transistors numbers?

 

[Handy Andy]

Ok, be careful - the Cauldron could be hot!

 

[kaos513]

Tr 18 and tr11 where backwards

 

[kaos513]

Still looking to see what else is wrong , I had this radio for a while sitting never got to it till this month

 

[Handy Andy]

Hmm...IF it's been that long...

What was once young ... awaited...with somewhat fidgety patience...

Has now reached...

​

 

[kaos513]

Doing a once over before I power it up

 

[NZ8N]

Are you sure these transistors were in backwards, or is the silkscreening on the board from an earlier revision where they changed transistor vendors in mid production, that are backwards from the previous vendor?

Remember, the Collector on most Japanese transistors is the center pin, the Emitter is on the side closest to electrical ground (maybe through a resistor or resistor/capactor) and the Base is usually the one "biased".

 

[kaos513]

im sure they where backwards

 

[Robalo]

im sure they where backwards

yes can you tell us the part number printed on it ? please

 

[kaos513]

Tr11-2sc945 tr18-2sc1674

 

[kaos513]

Might a job for my signal tracer