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  1. #1
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    MCM250 /22: a very technical tuner question

    Is there any way to enable the "extended" FM-OIRT band (65.81MHz - 74MHz)?
    I found a service manual for this audio system. I was able to switch the tuner board from "EUR" (europe) mode to "EAS" (eastern europe) mode by soldering a BC847C transistor and a 100K resistor (see the attached screenshot from the service manual). The tuner is now detected as "EAS" (in the service test menu).

    However, the FM-OIRT band is still not available. I did some digging and found something interesting in the service manual of another Philips system (MCM9) with identical ECO6 tuner board:

    "By holding the ECO and TUNER buttons depressed while switching on the Mains supply,
    one of the undermentioned features will be activated:
    - the tuning grid frequency is toggled between 9kHz and 10kHz for the Oversea (/21) version.
    - the extended FM1 (65.81MHz - 74MHz) is toggled on and off for East Eur. (/34) version."

    I tried different button combinations but nothing seem to be working. Can anyone with knowledge help me with this?
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  2. #2
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    Hello participants of the thread and forum members in general!

    Hopefully your issue was dealt with and you are no longer facing it. Since the thread has been silent for some time now, I will proceed by closing it. If you still have the same question about the same issue or any similar issues arise feel free to start a new thread or contact one of us moderators to open this thread again.

    Kind regards
    Philips – Katerina

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