FRG7 help please - UK Vintage Radio Repair and Restoration Discussion Forum

Renato65 · 12th Dec 2011, 12:32 pm

Hi all,

My trusty Yaesu FRG7 has has developed, what sounds like a PSU fault. For some time the receiver has worked well but with noticable hum in the audio. Now the receiver turns on with dim lamps and bad hum on audio. I have tried searching for schematics but only found user manuals with broken links to schematics.

If someone has a link or schematics at hand please help.

Regards all

Renato

Ian - G4JQT · 12th Dec 2011, 1:05 pm

This works with full pdf cct. FRG7

Or here.

Regards,

Ian

Renato65 · 12th Dec 2011, 1:15 pm

Thank you Ian,

Shorted rectifier diodes. Thank heavens only that. I'll make sure I save the schematics this time.

Regards

Renato

BobGreen · 12th Dec 2011, 7:33 pm

Keep it going Renato. They change hands on eBay for over 120 GBP these days. Tempted to put mine on soon as I now have an FT101B hybrid transceiver and an HRO for general coverage.

Bob

bill knox · 19th Apr 2015, 11:02 am

Hi

I recently bought a Yaesu FRG-7 at an auction, I have never seen so much nicotine in my life.
Someone has had a good "twiddle" of the coils, after realignment it works after a fashion, but I have one fault that is giving me a headache, if I inject a signal into the aerial socket I get no output on any band, but if I inject a signal across VC1 the 300pf tuning capacitor" I get a good output, although because I have injected the signal after the aerial input coil T101-2-3-4 it is not at full spec.
I am quite certain that the problem is with S2 the waveband switch, but it is a little difficult to get at as the connecting wires are so short.
There is also the attenuation switch but if I short out the waveband switch this does appear to work, so I am back at the waveband switch agin
Has anyone else come across this problem on the FRG-7

?

Bill

space charge · 19th Apr 2015, 1:09 pm

does it have a lamp fuse in the aerial input by any chance. pierce ei7ka

HamishBoxer · 19th Apr 2015, 5:58 pm

If the coils are ok for certain then paxolin on switches can go leaky or is it nicotine on them?

12th Dec 2011, 12:32 pm	#1
Renato65 Tetrode Join Date: Jun 2011 Location: Johannesburg, South Africa. Posts: 82	FRG7 help please Hi all, My trusty Yaesu FRG7 has has developed, what sounds like a PSU fault. For some time the receiver has worked well but with noticable hum in the audio. Now the receiver turns on with dim lamps and bad hum on audio. I have tried searching for schematics but only found user manuals with broken links to schematics. If someone has a link or schematics at hand please help. Regards all Renato

12th Dec 2011, 1:05 pm	#2
Ian - G4JQT Octode Join Date: Jun 2004 Location: Reading/Fakenham, UK. Posts: 1,324	Re: FRG7 help please This works with full pdf cct. FRG7 Or here. Regards, Ian

12th Dec 2011, 1:15 pm	#3
Renato65 Tetrode Join Date: Jun 2011 Location: Johannesburg, South Africa. Posts: 82	Re: FRG7 help please Thank you Ian, Shorted rectifier diodes. Thank heavens only that. I'll make sure I save the schematics this time. Regards Renato

12th Dec 2011, 7:33 pm	#4
BobGreen Retired Dormant Member Join Date: Jan 2011 Location: Egham, Surrey, UK. Posts: 219	Re: FRG7 help please Keep it going Renato. They change hands on eBay for over 120 GBP these days. Tempted to put mine on soon as I now have an FT101B hybrid transceiver and an HRO for general coverage. Bob

19th Apr 2015, 11:02 am	#5
bill knox Hexode Join Date: Mar 2011 Location: Wilstead, Bedfordshire, UK. Posts: 367	Re: FRG7 help please Hi I recently bought a Yaesu FRG-7 at an auction, I have never seen so much nicotine in my life. Someone has had a good "twiddle" of the coils, after realignment it works after a fashion, but I have one fault that is giving me a headache, if I inject a signal into the aerial socket I get no output on any band, but if I inject a signal across VC1 the 300pf tuning capacitor" I get a good output, although because I have injected the signal after the aerial input coil T101-2-3-4 it is not at full spec. I am quite certain that the problem is with S2 the waveband switch, but it is a little difficult to get at as the connecting wires are so short. There is also the attenuation switch but if I short out the waveband switch this does appear to work, so I am back at the waveband switch agin Has anyone else come across this problem on the FRG-7 ? Bill

19th Apr 2015, 1:09 pm	#6
space charge Tetrode Join Date: May 2013 Location: Enniscorthy, County Wexford, Ireland. Posts: 74	Re: FRG7 help please does it have a lamp fuse in the aerial input by any chance. pierce ei7ka

19th Apr 2015, 5:58 pm	#7
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: FRG7 help please If the coils are ok for certain then paxolin on switches can go leaky or is it nicotine on them? __________________ G8JET BVWS Archivist and Member V.M.A.R.S