Is your "lock LED flashing when tuning through the megacycle tuning?
On Fri, Apr 7, 2023, at 9:50 AM, Bob W8RMV wrote:
..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?
