Manual or schematic for Redifon R500 needed - UK Vintage Radio Repair and Restoration Discussion Forum

Mietek_PL · 23rd Sep 2021, 11:28 pm

Recently I bought from military surplus store two faulty Redifon R500 receivers. They are somehow live but not working as receivers should.
In one I have random numbers on displays after pwr on. Dead kbd, noise from the speaker. Filter/IF board looks to be operational.
Second one is silent but kbd operate. On display I can enter frequency and mode. It looks as there is a chance to restore at least one operational from two I own.
It will be very helpful if someone can share schematic, blok diagram or any troubleshooting help.
73,
Mietek SQ5PTQ ex SP5HBT

G8BBZ · 27th Sep 2021, 4:28 pm

Hi Mietek,
Please find attached a block diagram for the R500 receiver.
Hope this helps

Cobaltblue · 27th Sep 2021, 4:52 pm

No attachment

Cheers

Mike T

G8BBZ · 27th Sep 2021, 5:12 pm

Hi Mietek,
Try Again

Mietek_PL · 27th Sep 2021, 8:51 pm

Hi Peter,
Thank You vy much. It gives me overall picture how R500 is working.
Do you have diagrams of the receiver? In one of the receivers I expect issues with PWR Supply and Tuner control board. Also processor board operates in strange way.
Mietek SQ5PTQ ex SP5HBT

23rd Sep 2021, 11:28 pm	#1
Mietek_PL Diode Join Date: Jun 2018 Location: Warsaw, Poland Posts: 4	Manual or schematic for Redifon R500 needed Recently I bought from military surplus store two faulty Redifon R500 receivers. They are somehow live but not working as receivers should. In one I have random numbers on displays after pwr on. Dead kbd, noise from the speaker. Filter/IF board looks to be operational. Second one is silent but kbd operate. On display I can enter frequency and mode. It looks as there is a chance to restore at least one operational from two I own. It will be very helpful if someone can share schematic, blok diagram or any troubleshooting help. 73, Mietek SQ5PTQ ex SP5HBT

27th Sep 2021, 4:28 pm	#2
G8BBZ Pentode Join Date: Oct 2005 Location: Hebden Bridge, West Yorkshire, UK. Posts: 200	Re: Manual or schematic for Redifon R500 needed Hi Mietek, Please find attached a block diagram for the R500 receiver. Hope this helps __________________ Peter G8BBZ

27th Sep 2021, 4:52 pm	#3
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,874	Re: Manual or schematic for Redifon R500 needed No attachment Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

27th Sep 2021, 5:12 pm	#4
G8BBZ Pentode Join Date: Oct 2005 Location: Hebden Bridge, West Yorkshire, UK. Posts: 200	Re: Manual or schematic for Redifon R500 needed Hi Mietek, Try Again Attached Thumbnails __________________ Peter G8BBZ

27th Sep 2021, 8:51 pm	#5
Mietek_PL Diode Join Date: Jun 2018 Location: Warsaw, Poland Posts: 4	Re: Manual or schematic for Redifon R500 needed Hi Peter, Thank You vy much. It gives me overall picture how R500 is working. Do you have diagrams of the receiver? In one of the receivers I expect issues with PWR Supply and Tuner control board. Also processor board operates in strange way. Mietek SQ5PTQ ex SP5HBT