Any electronics whizzes or repairers out there?

Stonker

I have a Yamaha RX-V1800 amp which has stopped working. It's absolutely dead. I have 240vac on the mains input on the power supply board but nothing on the output to the mains transformer (CB6). Can anybody advise? I wonder if it's easier to just replace the whole power board?

googler

Do you mean on the output FROM the transformer? If not, what's between the 240v point and the point where you're getting zero?

Stonker

I've not taken the board out or anything. Ther mains plug terminates on a board. I think there's a relay, capacitors, a small transformer, a fuse etc. There is a plug which goes to a massive tranformer. There is no voltage on that plug

bluesnake

Stonker wrote: »

I've not taken the board out or anything. Ther mains plug terminates on a board. I think there's a relay, capacitors, a small transformer, a fuse etc. There is a plug which goes to a massive tranformer. There is no voltage on that plug

Ah, the transformer and the massive transformer......

On some occasions photos really help, however this may not be one of those occasions.

bluesnake

think this would be a good place to start

http://www.servicemanual.ws/YAMAHA_-_RX_V1800_-_Service_Manual_-_Pages_181--2235493.html
http://www.scribd.com/doc/48691052/Yamaha-RXV1800-rec
http://www.ebay.com/itm/Yamaha-RX-V1800-Service-Manual-PDF-on-CD-181-Pages-/290972149526?pt=UK_Sound_Vision_Manuals_Resources&hash=item43bf4aa716
http://www.tradebit.com/filedetail.php/159941901-yamaha-rx-v1800-dsp-ax1800-htr-6190-service

Stonker

I'm happy to take photos if it does help but the 'small transformer' is mounted on the board, the 'massive transformer' is too heavy for that and is 4 or 5"across

kev_min

The manual is available for free from http://www.eserviceinfo.com, its a multipart download.

However, unless you are experienced, this amp may be beyound a diy repair. the transformer on the small board powers logic on the function board amp, if its not happy for many reasons it will not allow the relay to pull in to power the main transformer.

Download the manual and make your own decision based on your competence.