Luxman M-2000 Recap/Repair

[CohibaJoe]

Just got in a Very Clean Fleebay Deal today.

The Right Channel is Blown out. Left Channel will also need a rebuild.

Going to be Rebuilding Right/Left Power Boards and a Complete Recap for the rest.
This Amp I am sticking with Nichicon PW as to Long Life and 105Deg...Looking for another 30+ yrs.

Caps will be:
Nichicon PW
Nichicon KL (Tantalum replacements)
Nichicon ES (Bi-Polar)

 

[CohibaJoe]

As you can see from the Pics...someone tried to Fix the Power Amp Board...

Blown Transistors, Resistors and Didoes replaced...

Looking at the Outputs...2SD424 and 2SB554

Getting together a Parts List now.

 

[CohibaJoe]

PB-1046

Looking for the Transistors for NPN and PNP as these were Replaced and do not trust what is on this board. Nothing in the SM on this.

Does anyone have the Original Part#..:scratch2:

 

[CohibaJoe]

You talk about sneaky.....A Reply..MAT2F-CH 24VDC

Meter Board has a few Caps.

The "4" 6v 0.15A Lamps will be ordered from Fleebay...Going LED and seller is Local.

Volume Board also has a few Caps.

 

[mrflex65]

According to the SM,they should be 2SC1431 or 2SA762 but i don't know what the sub is offhand.Maybe try Mouser or Digikey? :scratch2:

 

[fernarias]

There is no trusted replacement for those TO-66. Perhaps you can fashion something with TO-220? A good match would be MJE15031G and MJE15030G both available and with better specs.

 

[Dswankey]

Well is it bad or is she fixable?

 

[CohibaJoe]

Well is it bad or is she fixable?

Fixable...

Need to Rebuild the Power Boards as I do not trust what was repaired on these boards...Had to do this with my L-100U and all worked out very well. All other Boards are working as I disconnected the Power Boards and she came up.

 

[CohibaJoe]

Have a Parts list together...Going to Order.

So testing the Power Boards...Diodes 1S1555 are Bad, A few Transistors 2SC945, 2SC1507 and some Resistors are Blown. So I will be replacing All the Diode, Transistors and Resistors. There are some VD-1221 that will be replaced.

Not many parts on these boards anyway and my L-100U parts unit has the 2SC945 and 2SC1507.

 

[CohibaJoe]

Parts are about in...Wanting for the TO-66 Transistors from Consolidated...Yes they have TO-66's that will work (Sony, Central and Toshiba)..:yes:

Looking at the PB-1045 Board.

What like to verify the correct Placement of PB-1046 Boards (PNP,NPN) that connect into PB-1045 (Pic).

There are markings (Picture) for PNP and NPN(PB-1045). The Boards PB-1046 that I took out had PNP connecting into NPN connector. And NPN connecting to PNP.

No sure if someone has some close-up's pictures...Or if you can Open up the case...

 

[Dswankey]

Cohiba,

I have pictures, probably not what you need though.

http://www.audiokarma.org/forums/showthread.php?t=484859

When my new to me tube pre-amp get's back from the shop (I'm thinking a week or two) I'll be rotating her into the line up at which point I could pop open my M-2000 and take pics. I'm not sure if you can or want to wait that long but I thought I would offer.

 

[CohibaJoe]

Cohiba,

I have pictures, probably not what you need though.

http://www.audiokarma.org/forums/showthread.php?t=484859

When my new to me tube pre-amp get's back from the shop (I'm thinking a week or two) I'll be rotating her into the line up at which point I could pop open my M-2000 and take pics. I'm not sure if you can or want to wait that long but I thought I would offer.

I can wait....Just making sure on this. Working on the rest of the boards now (Recapping).

Checking on-line and not many pics of close shots of these boards.

Thanks.....and Happy New Year!!!!!!

 

[Dswankey]

Let me know where exactly and what I should be taking pictures of.

 

[CohibaJoe]

Let me know where exactly and what I should be taking pictures of.

If you can take a close up picture of Both sides of the Outputs and back of PB-1045 board. There is a wire on 1 board and not on the other.

Who knows what the other person was doing.

This will let me know on PNP/NPN placement.

Thanks...:thmbsp:

 

[Dswankey]

I'll be bored this weekend, so I'll pop the top and do my best to get you some good pics.

 

[CohibaJoe]

I'll be bored this weekend, so I'll pop the top and do my best to get you some good pics.

Look forward to the pics....

 

[CohibaJoe]

PB-1047: Protector & Automatic Voltage Regulator
PB-1048: Peak Indicator Circuit

Caps, Relay and Diodes replaced. Resistors checked and OK.


Next PB-1011: Power Meter

 

[CohibaJoe]

PB-1011: Power Meter is completed.

Going to put this back together....Just waiting for the TO-66 to get in next week for the Power Amp. And some Pics from "Dswankey" on the Power Amp Board placement.

When I got this in and started to look at this I just shake my head on what the other person was thinking...:scratch2:

I will test(DBT) this Friday without the Power Amps connected.

 

[Dswankey]

@cohiba,

Here's some pics, I was a little nervous about unscrewing or removing anything other then the case. I hope these suffice.

 

[Dswankey]

Cohiba,

Any updates?