A couple of years back the Left hand channel kept cutting out and on advice changed the source selector. This worked until recently but the problem has returned. It only cuts in when I crank the volume up to max (painful!), and a post I saw somewhere on the net suggested that the problem was with the (mute) relay.
It makes sense to me that changing the input selector made for a stronger signal which wouldn't cut out, but it seems that the relay becomes less efficient with arcing, and has to be cleaned / changed.
I've opened the unit but has no idea what the relay unit looks like, how to get at it, and how to burnish the contacts.
Any ideas (before I have to junk it)?
Cheers.
It makes sense to me that changing the input selector made for a stronger signal which wouldn't cut out, but it seems that the relay becomes less efficient with arcing, and has to be cleaned / changed.
I've opened the unit but has no idea what the relay unit looks like, how to get at it, and how to burnish the contacts.
Any ideas (before I have to junk it)?
Cheers.
It will have "OMRON" written on it and i think it's near the speaker terminals. According to the service manual it's an Omron G5Z-2A-E type relay with a 24V coil.
Is this a speaker relay or a signal relay?
In either case the amp could be detecting a fault and opening the relay to protect the speaker and possibly save the amplifier from further damage.
In either case the amp could be detecting a fault and opening the relay to protect the speaker and possibly save the amplifier from further damage.
AndrewT, its a speaker relay. The contacts are only rated for 5A, and they can tarnish. Why Arcam didn't use a standard footprint relay i've no idea...
Thanks Jaycee. I've located the Omron ..., which I'd like to replace. Any idea where I could find one?
Thanks
Thanks
Unfortunately the particular Omron relay that these amps use has been discontinued. Here is it's data sheet:
http://www.escol.com.my/Datasheets_specs/G5Z(OMRON).pdf
I think the best bet is to get something close, eg Finder 40.52 type, and bend the pins.
You could also email Arcam and see if they have any suggestions. They are quite friendly, and will even send you a PDF of the service manual if you ask.
http://www.escol.com.my/Datasheets_specs/G5Z(OMRON).pdf
I think the best bet is to get something close, eg Finder 40.52 type, and bend the pins.
You could also email Arcam and see if they have any suggestions. They are quite friendly, and will even send you a PDF of the service manual if you ask.
The Finder looks like a good fit so I've ordered a couple (to allow for clumsiness); would I be right to clip off contacts 12 and 22?
I have an Alpha 8 on which the left channel is always on while the right clicks on with the relay, so I assume the relay is faulty. Can you confirm the Finder is a suitable replacement? Thanks,
You can remove the suspect relay from the board and test with a multimeter on continuity.
There should be no continuity measured between the normally open and common terminals. This relay is a suitable replacement. https://richelectronics.co.uk/product/omron-g5v-2-24v-dc-pcb-mount-signal-relay-dpdt-om0349a
There should be no continuity measured between the normally open and common terminals. This relay is a suitable replacement. https://richelectronics.co.uk/product/omron-g5v-2-24v-dc-pcb-mount-signal-relay-dpdt-om0349a