The service manual for the Beocord 5000 (4705, 4715) calls out using several B&O alignment tools. Has anyone ever come across those? It would be handy to reproduce them for future servicing. Without the alignment tools are you just eyeballing the adjustments and then testing the results with a cassette? I have one of these decks I bought new back

...and the right channel -

A follow-up....Using my ammeter at the points I showed in the previous photo didn't measure anything so I went with Dillen's recommendation on adjusting for 12mVDC across the emitter resistors. Here are the photos of that.

I have been working on my 2408B model. The recap is done. Here is the 8002095 Output Amplifier PCB that has the four extra trimmers. I have marked what I believe are the correct locations for performing the idle DC check. The service manual calls for pulling the left and right output wires (hv/r and r) and using an ammeter to adjust the idle current

What about the 569 trim pot? That is the left channel trim pot you replaced, right? Did you double-check it is set to the right value? -sonavor

Okay, so I think I understand it - Diagram A shows the update from the original BM-4000 type 2406 to the ones I have (which are type 2408). Diagram B shows an update of type 2408 for units with serial numbers after 227250. That update is what I have on my second unit. Thanks a lot Søren, sonavor

Here are the component sides of my two BM-4000 (type 2408) unit's 8002095 PCB - My first unit's 8002095 PCB - My second unit's 8002095 PCB - The first thing I noticed was that this second unit's 8002095 PCB has an additional two trim pots in the bottom, center of the board. The original BM-4000 schematic that comes with each unit shows

Here is the original schematic PCB layout for 8002095. The two pairs of diodes (579 and 582, 489 and 492) are highlighted. Notice that the connection node for each pair shows them connected per the schematic drawing - Looking at the node between 582 and 579 on my first BM-4000 unit, here is that picture - You can see that the connection trace has been

Here is a picture of my first BM-4000 unit small resistor/capacitor board that connects to the power capacitors and the 8002095 PCB - Now here is the same circuit from my second BM-4000 that has this circuit placed on the PCB designated 8002135

The first differences I want to show is in the schematics Here is my redraw of the circuitry in the original schematic drawings included with the BM-4000 Now here is the schematic as I traced out of my first BM-4000 (the one with the small piece of PCB material like Søren's) - The first thing to notice here is that the 8.2k ohm resistors