Hello lovely people, just wondering if anyone can help me, I have a meridian 557 with rising dc voltage on left output, (speaker terminals )all electrolytics have been replaced, apart from main filter capacitors. output and driver transistors test ok as do the emitter resistors, it shuts down when it reaches 5v and climbs steady from 0. Nothing seems to be getting hot. I've had a run through with the multimeter and nothing jumps out as obvious when dead testing.
I know I need to start measuring voltages now and am gonna start with the 15v regulators.
Looking to learn and hopefully fix this, any help/advice great fully received 👍
I know I need to start measuring voltages now and am gonna start with the 15v regulators.
Looking to learn and hopefully fix this, any help/advice great fully received 👍
It helps immeasurably to have a schematic of what you're referring to - particularly for this uncommon brand. Thankfully, there have been several threads here about problems with this and similar Meridian models. One such thread post with a decent quality set of schematics attached is: https://www.diyaudio.com/forums/att...ual-request-meridian-557-amplifier-scnematic-
Thanks Ian and hello from the UK, my thoughts on this are its a leaky transistor or it oscillating, if I disconnect the bases of the driver transistors q7 and q25 would that be enough to establish whether the problem was in the output stage or coming from the input ? Anyone ?