AU-X1

[Willy6]

I'm waiting for a couple of bipolar caps for F-2781and change that relay then I'll reinstall it and get the transformer hooked back up

 

[Willy6]

In case you want to see my soldering job
F-2775 recapped

 

[Willy6]

If you see anything else I need to change please let me know.So far all of the transistors I've checked looked good

 

[Willy6]

If you see anything else I need to change please let me know.So far all of the transistors I've checked looked good

Accept those 3 outputs

 

[Ronito6]

Test to see if the angles of the trimmers allow you to reach the trimmer knobs.

In this pic C21 and 22 seem to be blocking access to the trimmer.

Below the heat sink seems it may be partially blocking access to the trimmer.

Confirm you have the ability to access the components you will need to access.

 

[Willy6]

Test to see if the angles of the trimmers allow you to reach the trimmer knobs.

In this pic C21 and 22 seem to be blocking access to the trimmer.

Below the heat sink seems it may be partially blocking access to the trimmer.

Confirm you have the ability to access the components you will need to access.

If I hold them vertical like the way they're installed l can get to them I checked that.I sank the two rear pins and held the single front pin out away from board

 

[Willy6]

If I hold them vertical like the way they're installed l can get to them I checked that.I sank the two rear pins and held the single front pin out away from board

But you're right I may have to tweak a few things here and there

 

[Willy6]

But you're right I may have to tweak a few things here and there

I can rearrange things I've already done but what I'm more concerned about are things like (are there certain diodes,fets or transistors I should change out ?)or finish doing what I've been doing put it back together and see what happens first.

 

[Ronito6]

Keep the parts changing to a minimum.

If it checks OK keep it.
Especially if replacement or substitutions are nearly impossible to find like the FETs or the output transistors.

If you have a diode problem it will most likely be VD1212 / MV 12 or the zener diodes

 

[Willy6]

Keep the parts changing to a minimum.

If it checks OK keep it.
Especially if replacement or substitutions are nearly impossible to find. Like the FETs or the output transistors.

If you have a diode problem it will most likely be VD1212 / MV 12 or the zener diodes

I've been checking transistors and diodes with a curve tracer in circuit and so far they look good.

 

[Willy6]

Not sure if it's a good idea but I'm thinking of using wire connectors for the wires that are soldered on to the F-2775 boards in case I need to pull them out for any reason?

 

[Ronito6]

Wire connectors? I wouldn't.

At least not as a permanent feature.

 

[Willy6]

Wire connectors? I wouldn't.

At least not as a permanent feature.

I prabably won't either but I was wondering why they used wire connectors on everything else but those?

 

[Ronito6]

In the mid to late 70s the Japanese electronics manufacturers began moving big time into engineering electronics based on modularity. The idea being that a system, like an amp, could be more easily manufactured, serviced, and even upgraded as modules rather than the hard wired architectures that dominated previously.

The X1 was famous for being amongst Sansui's first modular amps. So it is festooned with Molex plugs and other electronic plug and prong type connections.

But only so much in a device as powerful as an X1 can be safely plug equipped. The 2775 red and blue wires that you example go from the 2775 to the 4 X 10,000uf 80v bank of filter capacitors. The safety and reliability of that connection is best insured by hard wiring / direct soldering to wire.

X1 MODULARITY FUN FACT: The equalizer and MM cards on the X1's phono motherboard and the ones on the X11 are interchangeable. So the cards from an X11 will happily function in an X1.

 

[Willy6]

In the mid to late 70s the Japanese electronics manufacturers began moving big time into engineering electronics based on modularity. The idea being that a system, like an amp, could be more easily manufactured, serviced, and even upgraded as modules rather than the hard wired architectures that dominated previously.

The X1 was famous for being amongst Sansui's first modular amps. So it is festooned with Molex plugs and other electronic plug and prong type connections.

But only so much in a device as powerful as an X1 can be safely plug equipped. The 2775 red and blue wires that you example go from the 2775 to the 4 X 10,000uf 80v bank of filter capacitors. The safety and reliability of that connection is best insured by hard wiring / direct soldering to wire.

X1 MODULARITY FUN FACT: The equalizer and MM cards on the X1's phono motherboard and the ones on the X11 are interchangeable. So the cards from an X11 will happily function in an X1.

Actually those red and blue wires to the 4x10,000 uf 80v caps do have wire connectors on this one

 

[Willy6]

Actually those red and blue wires to the View attachment 750899 4x10,000 uf 80v caps do have wire connectors on this one

The grounds are all hardwired in

 

[Ronito6]

Ah...that was certainly installed by a previous DIYer. Of all the other restorations that I have checked out, absolutely none of them modified that wiring to accept connectors.

Keep the modification. I don't think it will cause any problems.

Your X1 is an interesting case.

 

[Willy6]

Ah...that was certainly installed by a previous DIYer. Of all the other restorations that I have checked out, absolutely none of them modified that wiring to accept connectors.

Keep the modification. I don't think it will cause any problems.

Your X1 is an interesting case.

I think it was done at the factory because both of my x-1's have the exact same wire connectors

 

[Ronito6]

I think it was done at the factory because both of my x-1's have the exact same wire connectors

You are absolutely the only one with that modification.

If the regional repair facility was the same for both units, then that became a shop practice.

You said that one of your X1's was obtained near where you live, and the second was bought from eBay.
Was that eBay seller in your region too?

Trust me....That modification is unseen anywhere else.

 

[Willy6]

You are absolutely the only one with that modification.

If the regional repair facility was the same for both units, then that became a shop practice.

You said that one of your X1's was obtained near where you live, and the second was bought from eBay.
Was that eBay seller in your region too?

Trust me....That modification is unseen anywhere else.

The one on ebay came from new Jersey and the other one was on Craigslist in redding California