Schematic question

[Valvehead]

Can someone have a look at this scem ? I was told there was a thermistor in here that will turn the 2 fans on and off. I dont see one...unless the LM7824 is used somehow ..but isnt that a voltage reg. ? Page 2 .
Just curious !

[Chuck H]

What's this thingy on the fan circuit labeled 9L122uh below. Never seen that component symbol before. There's another on the power switch without a moniker.

[The Dude]

I don't see it. It could be there, but I don't see it. I believe it's probably hooked between J18-1 and J18-2 on the schematic and probably mounted on a heat sink. Those 2 points are to the right of the LM7824 on the schematic.

[The Dude]

What's this thingy on the fan circuit labeled 9L122uh below. Never seen that component symbol before. There's another on the power switch without a moniker.

Maybe coils for EMI supression?

[Valvehead]

thought ferrite bead ??

[Jazz P Bass]

The thermal switch connections are marked as the Dude said.
(the switches themselves are not shown))

J18-1 J18-2 is connected to a 65 c switch.

J18-3 J18-4 goes to a 90 c switch.

[Valvehead]

The thermal switch connections are marked as the Dude said.
(the switches themselves are not shown))

J18-1 J18-2 is connected to a 65 c switch.

J18-3 J18-4 goes to a 90 c switch.

the dude is correct ! i traced it through the amp and found those 2 parts hidden under a big heat sink

[Jazz P Bass]

What's this thingy on the fan circuit labeled 9L122uh below. Never seen that component symbol before. There's another on the power switch without a moniker.

It's possible that the part is a dual coil inductor made by Murata.

https://www.google.com/url?sa=t&rct=...VQGXXOREepIZ0S

[J M Fahey]

Most probably.
If labelled jtīs a commercial product; if unlabelled itīs probably aplain generic ferrite bead.

Although the commercial products may be as simple as same ferrite bead or slightly larger one with a single or dual wire loop through it.

The difference being (maybe, wild guess follows) that a human must pass a wire through a ferrite bead while one with a wire preinserted (and with ends pretinned) can be inserted in a PCB at the rate of 1200 an hour or something like that.

Mighty Terminator will rule the Earth.

[Chuck H]

Mighty Terminator will rule the Earth.

But he won't build "my" amps (though he may hunt me down and scrub me into red goo on the asphalt )

[Sowhat]

Most probably.
If labelled jtīs a commercial product; if unlabelled itīs probably aplain generic ferrite bead.

That sounds real plausible but what's up with those reference designators, I don't ever think I have seen a schema like that before... kind of cryptic. 9L122uH the 9L is the ninth inductor maybe? the schematic uses things like 8C for a capacitor and like that. Is 122 micro henries reasonable for that application? I think that's the value, it's a composite reference designator/value marking maybe... yeah strange... no! I see it now! the (9) is the circuit group the next two are the reference designator (L1) and the last 4 characters are the value (22uH)... yeah, strange.