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Yamaha m85

A

Antonello

New Member
Hello everyone my name is Antonello sorry for my english I live in Sardinia I'm italian my post refers to my yamaha m85 amplifier put it aside about ten years ago he was always in my room it worked took only a little dust yesterday I wanted to turn it back on I put a 100watt bulb in series to the power supply but it doesn't turn on at all only the bulb illuminates if I turn it on without a light bulb what happens?
 
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I would expect it would be OK just turning it on. The bulb is obviously causing too much of a voltage drop for the amp to turn on.
 
I'm not sure that you will get it to come up on a 100w bulb. I have a few less powerful amplifiers that won't come out of protection without using a bigger bulb. If it's still in good operating order it should be fine without the bulb but who knows.
I'd inspect around to make sure the amp doesn't have any damage from the corrosive glue that they used when assembling them. That's usually what causes M80/85s to destruct.
 
[QUOTE = "OMGCat !, post: 13709381, membro: 212134"] Non sono sicuro che riuscirai ad arrivare su una lampadina da 100w. Ho alcuni amplificatori meno potenti che non usciranno dalla protezione senza usare una lampadina più grande. Se è ancora in buone condizioni operative dovrebbe andare bene senza la lampadina ma chi lo sa.
Ispezionerei in giro per assicurarmi che l'amplificatore non avesse alcun danno dalla colla corrosiva che usavano durante il loro assemblaggio. Questo di solito è ciò che provoca la distruzione degli M80 / 85. [/ QUOTE]
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Thanks for replying immediately
I had already removed the glue years ago and changed the resistances nearby which were corroded
if I turn it on directly is there no danger that the big electrolytes will burst?
 
Antonello said:
[QUOTE = "OMGCat !, post: 13709381, membro: 212134"] Non sono sicuro che riuscirai ad arrivare su una lampadina da 100w. Ho alcuni amplificatori meno potenti che non usciranno dalla protezione senza usare una lampadina più grande. Se è ancora in buone condizioni operative dovrebbe andare bene senza la lampadina ma chi lo sa.
Ispezionerei in giro per assicurarmi che l'amplificatore non avesse alcun danno dalla colla corrosiva che usavano durante il loro assemblaggio. Questo di solito è ciò che provoca la distruzione degli M80 / 85. [/ QUOTE]
_____________________________
Thanks for replying immediately
I had already removed the glue years ago and changed the resistances nearby which were corroded
if I turn it on directly is there no danger that the big electrolytes will burst?
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if you’ve already run it up on the dbt the capacitors have mostly charged. Since you’ve already repaired the glue issues you should be ready for a full power up.
 
OMGCat! said:
if you’ve already run it up on the dbt the capacitors have mostly charged. Since you’ve already repaired the glue issues you should be ready for a full power up.
Click to expand...

So today I did two tests I disconnected the four fuses from the power supply and I turned on without the bulb in series and the display if illuminated then I reinserted the fuses and turned on the protection if disabled and it's ready I won't leave it idle for a long time
 
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