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Marconi 2951 radio test set vintage

I have a rather old Marconi 2951 radio test set which I keep for a back-up.
It has developed a fault in that the frequency lock function will not work. If the lock is set to off the frequency generated is stable. However engage the frequency lock in the fine or course setting mode and the lock light flashes on an off and the generated frequency bounces around plus/minus 0.5MHZ.
The unit also seems to be running quite hot?

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Possibly a power supply problem - check current drawn from the power line compared with your other 2951. any disturbance in power supply voltages can kill the afc/pll in older service monitors. if you have the manual check the ps voltages

Posted on Nov 30, 2008

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