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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 23rd Sep 2021, 10:28 pm   #1
Mietek_PL
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Default 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
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Old 27th Sep 2021, 3:28 pm   #2
G8BBZ
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Default Re: Manual or schematic for Redifon R500 needed

Hi Mietek,
Please find attached a block diagram for the R500 receiver.
Hope this helps
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Old 27th Sep 2021, 3:52 pm   #3
Cobaltblue
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Default Re: Manual or schematic for Redifon R500 needed

No attachment

Cheers

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Old 27th Sep 2021, 4:12 pm   #4
G8BBZ
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Default Re: Manual or schematic for Redifon R500 needed

Hi Mietek,
Try Again
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Old 27th Sep 2021, 7:51 pm   #5
Mietek_PL
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Default 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.
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