Beomaster 1900 (2300) muted after capacitor change

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paul_f Posted: Sat, Apr 7 2018 8:59 AM

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I have replaced all of the capacitors in my Beomaster 2300 (which is a 1900) using the kit from Martin.

It was working before I started.

All of the lamps are working.

IL1 voltage varies with the volume control changing.  It tests at 15 ohms with the power off.

31V rail is working

There is 0.5V at the gate of TR206 when off the lowest volume point (changes to -6V when at the lowest volume)

The base of TR207 has -0.2V on it when in tape mode which changes to 0.7V when in standby.

I haven't changed the pot sliders yet as they looked okay (and worked fine before)

I think the next thing is for me to follow a signal through using an oscilloscope unless anyone else can suggest anything?

Thanks

Paul

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paul_f replied on Sat, Apr 7 2018 10:30 AM

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One point is the speakers have a light thump on the first change from standby to on, and on any time changing back to standby.

I replaced and adjusted the trimpots to 12mV (TR249/349)

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paul_f replied on Sat, Apr 7 2018 1:12 PM

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Got an oscilloscope, easy fix - Connector P3 wasn't plugged in

A couple of problems still to solve

1. Clicking/thumping when turning on from standby (this was one of the reasons I wanted to replace the caps)
2. When going to standby it occasionally goes to FM1 instead

Any ideas?