Proton 930

[dshambala]

Hello,

I put a post up in Solid state and figure this is a better place for it. I am was looking to know if someone could help out with a service manual for a Proton 930 receiver. Looks that I have a couple bad components. If anyone can help out it would be greatly appreciated.

Cheers,
M

 

[dshambala]

Got it thanks!
Back up and running

M

 

[GarageSale]

I know this thread is two years old, but hopefully dshambala or whoever found the manual for him is still around and may be pinged on the thread update. I have a Proton 930 whose amp works (the RCA jacks labeled "MAIN" bypass the preamp and work fine) but whose input/control stage (switching between inputs, AM/FM, tone and volume controls etc) won't pass sound, just an occasional loud crackle as I fiddle with the rheostats.

Is anyone willing to share the schematics/repair manual with me?
I found the schematics to the Proton D940 in another thread here and will try to use those if I need to.

Also, can anyone familiar with Proton or NAD amps tell me where I might begin in troubleshooting this?

I may repost this as a new thread if this goes unseen.

Really looking forward to getting this classic amp working again and pairing it with some nice bookshelf speakers. Also, I'm new to diyAudio and am excited about the community.

Thanks!
GarageSale

 

[Novolec]

Hello GarageSale,
In your last post on this thread (a few months ago), you mentioned that you had a copy of the schematics for a Proton D940. Could you either point me to that thread or send me a copy of the diagrams?

Thanks,
Novolec

 

[DreadPirate]

May not be the cause, but the jacks in the rear are hardmounted to the pcb and the solder joints there have been the cause of a number of issues. Could be fiddling with the switch is making an intermittent contact back there and the problem is not necessarily the switch, though those could also be pcb mounted. Anyway, try refreshing all that solder.

 

[I Try To Fix Stuff]

Hi Garagesale, As you know, "no good deed goes..." I too, Am trying to fix my brothers D940 that I found on his dusty top shelf, and need the power amp section schematic... So how did it go, did you get your D930 working? If not, I'd be glad to help. Den

 

[dshambala]

I have a 930 and 950 service manual if you think this should help. Feel free to PM me.

 

[cdk99]

I know this is an old thread, but dshambala's PM box is full and I'd like a copy of the 930 service manual if someone would be so kind.

 

[dshambala]

Saw this recently and meant to put this link up.. Hope this helps
Temp Share : Proton_930_ServiceManual.pdf | Free temporary file hosting

 

[cdk99]

Thank you! 🙂

 

[tonester]

Proton D930 Service Manual

I have a Proton D930 I'm trying to find a SM for so I can adjust idle current. Want to get it correct so if anybody has one or can let me know which trimmers do what to read idle current I'd appreciate it.