When the tone arm gets towards the end of the disc, there is a loud 50Hz hum coming through the amp & speakers. At the begining of the disc everything is quiet. Everything is earthed correctly and this problem started one day quite suddenly. Sony dealer says this is too old to be economically repaired; anybody got any good ideas? The deck is only a few years old.
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Re: 50Hz noise appears at the end of the disc
Because the tone arm travels through an arc, it could be that shielding that should have continuity from the pickup shielding (which may be internal to the cartridge) through the tone arm and ending at the preamp input may be interrupted at the inside of the arc.
If you can see contacts at the back of the pickup (there should be a minimum of three, sometimes four) you may be able to see the shield mesh.
If you have a meter, you might try carefully connecting a small clip-on probe (electronic stores will have 'mini probes') to the shield, then put the other meter lead on any bare metal of whatever amplifier receiving the signal and then move the tone arm through its arc to see if the continuity is interrupted at the inner part of the arc.
Cartridges with 4 leads are generally Left, Right, shield, and a ground. If it is so configured, then the shield and ground leads will be connected at the connector on the amplifier end.
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The hum of course is the 60 cycle line AC voltage. Make sure that the routing of the AC power plug is as distant as possible from the stereo RCA cables.
The most likely problem is the connection of the phono cartridge to the wires in the arm. These connections usually are silver plated and become oxidized creating a bad connection. Remove the cartridge and using a fine eraser polish the connections. There is a ground connection that makes the five wire connection. Be super carfull these terminals are very easy to break
The phono connections to the stereo is very low voltage subject to interference. The connection to the magnetic pickup at the tone arm is low impedance and is inductive. Any poor connection between the cartridge up to the AV316 will produce this hum. Continue to check connections and swap cables with a known good to resolve.
I have switched the left and right cables to ensure that the cable is not the problem.
It could be the diodes, but whatever is the cause it's before the pre-amp section. Generally a loud hum such as that with no effect by volume control, is mostly caused by the filter capacitor in the power supply. And that hum is the 50HZ mains hum getting into your system!
the noise is coming from the wheel section, it's called air splash, humming varies with speed, main causes are wheel alignment due to loose ball joint, check if your tire erodes on one side, next check your disc brake for clogged air cooled vain and disc wearing
Your problem is either in the amplifier board (I can repair these) or the cable going to the cartridge on the tone arm (I stock these). When the machine is making the humming noise, unplug the cable from the tone arm at the top left side of the amplifier...If the sound goes away, I'd suspect the cable. If the sound continues, I'd suspect the amplifier board. Please fee free to email for more assistance, firstname.lastname@example.org.
The ground wire should be attached to the metal chassis or the tone arm metal assembly, the other end should be attached to the metal chassis of the amplifier. If the ground wire is not used, you will get real loud hum through the amplifier.
That sound is usually your icemaker calling for water. you can turn off your icemaker by lifting the little arm on the icemaker. As the icemaker calls for water the valve will be activated and will hum. This sound is usually not very loud. If your valve is making that much noise you may consider replacing the valve. The part number for you water inlet valve is #2315533 The retail price is $60.18 . I do have these on hand and available to ship out today if you need one. Please just let me know. You may also consider replacing your filter if your refrigerator has one. Thanks and I hope this will fixYa Michael Anderson Anderson Appliance (865)945-3808
HAVE YOU GOT ANY OTHER EQUIPMENT CONNECTED IF SO DISCONNECT THEM THEN JUST USE THE AMP,DECK AND SPEAKERS AND MAKE SURE THERE IS NOTHING ELSE PLUGGED INTO THE SAME CONNECTING LINE
THEN ADD THE OTHER ITEMS ONE BY ONE