开云体育

..I thought I'd give the group a try.

Friend gave me an old FRG7 to fix for him.? No fine tune on the front & has some corrosion on the chassis.

Symptoms:

• Only a light hiss from the speaker with volume turned all the up

• No stations or s meter movement

• Can hear the 455 IF (I think on 1455) if I mess with LOCK

So I check for the obvious:

• PS voltages OK.? Electrolytics ESR are fine.

• All connections seem fine

I suspect Q101 & find only G2 is working & replace it.? No change.

When I was checking component voltages I notice Q102/103 Emitters somewhat high at 2.5 & 2VDC

Also find that Q401 has 5.2vdc on G2 (vs 2.7).? I pull 401 & it checks fine.? I start searching for cause & misread the schematic looking for R133 to find R135 on the RF board completely missing (missing from Yeasu's component view also??).? So I install it, no change.

I then check Q407 voltages (connects up to Q401) & they are fine.? Further inspection of the IF/AF board I find a big solder blob left behind from another incompetent tech.? Remove it & no change.

I do insert a 3MHz signal into the the IF/AF board & get a loud report.

So I find 3 issues & still have a non working radio.? I am very surprised how quiet the AF is even at full volume.? I know it can get pretty loud when I inserted the 3MHz.

Any suggestions before I return the unit with a sad face.

Thanx - Bob W8RMV

ps - is there a good (cheap) source for 3SK40's?