EEVblog Electronics Community Forum

EEVblog => EEVblog Specific => Topic started by: EEVblog on May 20, 2021, 01:37:19 pm

Title: EEVblog 1394 - Onkyo Receiver Repair - Part 1
Post by: EEVblog on May 20, 2021, 01:37:19 pm
An interesting dive down the repair rabbit hole on an Onkyo TX-SR607 surround sound receiver amplifier with a failed vacuum fluorescent display.

https://www.youtube.com/watch?v=YMC3R86_2h0 (https://www.youtube.com/watch?v=YMC3R86_2h0)
Title: Re: EEVblog 1394 - Onkyo Receiver Repair - Part 1
Post by: Dr. Frank on May 20, 2021, 04:35:19 pm
Yeah Dave, please continue this repair on a real good device please, haven't seen such more sophisticated videos from you for a long time already.

Onkyo devices are quite good to repair, as their typical failures can be found on several HiFi forums.
My 25 y/o Onkyo Stereo amplifier is still working , only needed a cleaning of the output relay, and a disassembly and cleaning of the servo mode switch.
Found these repair hints also on the web.

These Onkyos are always made like a brick, I really love to work on them.

Frank
Title: Re: EEVblog 1394 - Onkyo Receiver Repair - Part 1
Post by: free_electron on May 20, 2021, 04:49:19 pm
you had your meter set to DC when first trying to measure the filament AC voltage 16:18 ... (even though you had the wrong pins)

Note: these onkyo machines can 'dim' their display through the remote control. are you sure the display is not set to 'off' ?

I want to know what CAD software is used for the pcb layout. The routing is very distinct in many japanese machinery. Same for their schematics. that is a very distinctive look.
Look at the display board. it has negative + signs etched in. the fonts are special , many traces end in little islands of copper to reduce the amount that has to be etched. The boards are full of wire straps. The cad software has to have special trickery to do that. It certainly is not altium/cadence/mentor... I am very curious to know what software this is and want to see a demo or trial of it.