FM4 tuner... can it be modify to work without it's memory processor ?

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30-Jan-2010 08:37 AM

Alain

Alain

Posts: 1

I found a QUAD FM4 tuner missing it's MP4480 IC. Is there a way to make it work properly without it ? ( I do not need the presets stations, manual tuning would be fine )

Any modification possible ?

Thanks !
Alain

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30-Jan-2010 12:23 PM

Stefaan

Stefaan

Posts: 628

No, it can't.

The FM4 is based on a microprocessor-controlled VCF (Voltage Controlled Filter).

The microprocessor stores voltages in memory and each voltage corresponds with a specific frequency for the band-pass filter.

This means that the whole concept is different from a classical analog tuning-circuit.

The MP4480 is the microprocessor-chip.

I think that sending the FM4 to Quad in Huntingdon for service is the best option.

Stefaan
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30-Jan-2010 12:24 PM

Stefaan

Stefaan

Posts: 628

Now the good news: I have one second hand MP4480 for sale!

Send an e-mail to stefaan@dadaelectronics.eu.

Stefaan
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05-Feb-2020 08:02 AM

EJP

EJP

Posts: 1712

Sorry to contradict my esteemed colleague, but it can indeed be modified to work without IC1. I am not permitted to publish the information as to how, as I was given it in strict confidence, and it's only useful during repair and debugging anyway, as you would hardly want to leave an FM4 in that state.

However now that Quad have made a new IC1 available the question is moot.

Dada Electronics Australia

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