Beocenter 2300 Mute Transistor defekt

[Roberto63]

Wo befindet sich bei der Beocenter 2300 der MUTE Transistor

[Guy]

You have asked this question a few times on the forum so I  thought I would have a look for the answer!

I could see from the circuit diagram in the service manual (available on Beoworld to Silver/Gold members) that it appears to be mounted on a separate board to the main PSU/Pre-Amp PCB (PCB2).  I couldn’t find a diagram, so I did a search with Google AI and received this answer:

Transistor Details: The mute transistor designated as TR1 in the Beocenter 2300 is a 2SC4213 SMD transistor.
Part Number: The specific part number for the TR1 mute transistor is 2SC4213.
Type: It is an SMD (surface-mounted device) transistor.
Location: The P-L MUTE circuitry uses two identical 2SC4213 SMD transistors (TR1 and TR2) and two 8.2K ohm resistors, which are mounted on a small, vertical 4-pin sub-board on the main PCB.
Function: A failure in one or both of these transistors is a known cause for audio issues, such as a popping sound when changing sources or one channel being dead, as they control the power-link (P-L) muting function.
Replacement: Replacements for this specific transistor are available from various online electronics suppliers.
If you are experiencing a mute-related problem, it is recommended to test both TR1 and TR2 and their associated components, as either or both can be the source of the fault.

I am guessing slightly but I think the small vertical PCB may well be the one that you can see the edge of (between the PL sockets and the 3 capacitors) in the PCB photo at this link:  https://kosetrading.com/product/bang-olufsen-bo-beocenter-2300-dab-radio-type-7400-power-supply-part-pcb-2/?srsltid=AfmBOoqX2I4oeoPjxBq0Qiioegkc5mxQQZ2tYzAHYY9v579QJKmKr1Mo

• This reply was modified 3 weeks, 1 day ago by Guy.
• This reply was modified 3 weeks, 1 day ago by Guy. Reason: Formatting after cut and paste from Google AI

Location: Warwickshire, UK

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[Hampus]

I don’t think I should start a new thread for this so here goes, a little take over and hijacking..

I as well own a beocenter 2300, one from 1991 with the curved laser track, and there’s an issue with the volume levels which I’m trying to sort out.

The 2300 is supposed to act only as a cd-player for my 7700, so maybe, thinking about it now, this isn’t a real issue for me?

I saw a Din to RCA-cable that I could plug into the tape 2 input on the 7700, and maybe I would be sorted? Is there a better way to hook it up to my 7700? Would prefer to use the tape 2 for streaming and movies as it is now.

I don’t see myself using active speakers with this puppy anytime soon. Sorry about thinking out loud but maybe you can tell me if there is an obvious and detrimental issue with the 2300 which is easy to fix, so I’m putting this out there.

The issue is:

The volume level is low on the right output and really low on the left. It is the same through the headphone-jack.

My guess since headphones also are affected is it’s a capacitor on the PCB, maybe even the mute one you’re speaking of? But that wouldn’t result in an imbalance, right? It would completely silence one channel?

Any help with finding the issue and possible solutions are much appreciated!

Location: Gothenburg

Favourite Product: Beocenter 7700

Signature: Beocenter 7700, Beocenter 2300, Beovox s45, cx100, cx50, Cona

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