I turned on my trusty A85 and no sound. It switched on, the display works, the relays for the various inputs work (click and light up) but zero sound. I download the repair manual and opened it up. The two removable fuses are fine. The manual says to check the RL100A (volume control relay)....but no idea where this is (or how to test it.)
I realised that normally if I press 'Mute' on the remote there is a click from the machine. Now when I press 'Mute' there is no click sound although 'Mute' lights up on the screen so I think the mute relay is b*ggered...which I think is what the manual is suggesting.
Not sure it's worth a fortune to send off to a specialist - I'm reasonably practical (but not an electrical engineer!). Any ideas?
I attach the repair manual and photo of the internals.
I realised that normally if I press 'Mute' on the remote there is a click from the machine. Now when I press 'Mute' there is no click sound although 'Mute' lights up on the screen so I think the mute relay is b*ggered...which I think is what the manual is suggesting.
Not sure it's worth a fortune to send off to a specialist - I'm reasonably practical (but not an electrical engineer!). Any ideas?
I attach the repair manual and photo of the internals.
Attachments
Some basic steps but I am sure you must have already checked as per these or something else.
1) Check for damaged parts,
2) dry solder,
3) when the unit is off check the position
of muting relay,
4) without the speaker connect a
multimeter to the Speaker out and
power on to check dc offset
5) when the unit is in on state on tap the
relay with back of the screwdriver. -
do it with speakers connected.
provided step 4 showed no Concern
for dc on output.
6) if DC is there on output than you need
to find the faulty parts and replace
them respectively
7) also check if audio is there on
headphone.
1) Check for damaged parts,
2) dry solder,
3) when the unit is off check the position
of muting relay,
4) without the speaker connect a
multimeter to the Speaker out and
power on to check dc offset
5) when the unit is in on state on tap the
relay with back of the screwdriver. -
do it with speakers connected.
provided step 4 showed no Concern
for dc on output.
6) if DC is there on output than you need
to find the faulty parts and replace
them respectively
7) also check if audio is there on
headphone.
Thanks, this is all great advice...but I have no idea where the volume control relay is...or what it looks like! Sorry. I'm hoping by looking at the maintenance manual and the photo (more available) someone can work out where it is on the board.... Then I can do tapping and testing!
I will go through the manual but can you tell me where you read the volume control relay, which page number
looking at the schematics it looks best to be handled by the company or someone who you know does these types of repairs.
the relay you are questioning is toward the back on the right side of the edge of the input board if you were looking at the image you shared it is on the right side in the middle of the page ( it is the white part with 8 leads - 4 on each side ) its surface mount relay but mind you the PCB is more than 2 layers in this amp. so I would personally not be tickling.
I would surely give it to some who knows Arcam.
the relay you are questioning is toward the back on the right side of the edge of the input board if you were looking at the image you shared it is on the right side in the middle of the page ( it is the white part with 8 leads - 4 on each side ) its surface mount relay but mind you the PCB is more than 2 layers in this amp. so I would personally not be tickling.
I would surely give it to some who knows Arcam.