roland JC 77

[pontiacpete]

does any one have the schematic?
thanks

[Steve L]

JC-77 Schematic

Here it is.

PLEASE NOTE: The person that scanned this apparantly thought it was a JC-120 schematic and labled it as such, however it is really a JC-77 amp.
You can tell by the single channel and the hi-treble pot.

By the way, this schematic is from 1984 and I am sure that you probably know that Roland made quite a few changes to this circuit over the years.
It may not be identical to the amp that you have.

Steve

[pontiacpete]

Thanks Steve!!

[teemuk]

As far as I know, that IS indeed a schematic of a JC-120. Not the combo model, though, but the head.

See:

- The same power amp circuit as in most JC-120's (wouldn't make any sense if it was a schematic for the lower power JC-77 version)
- Sub in jack and four speaker output jacks. No such things in JC-77 but indeed found from JC-120H.
- No speaker depicted in schematic although all Roland's JC-series combo schematics depict them.
- Overall the same features that the JC-120H head has (which are also features shared by the JC-77, hence the confusion)

I'm sorry to say it, I believe that is not the right schematic for JC-77.

Hopefully it will help, though because likely the preamp design in both is very similar.

[Mark Hammer]

Was the High Treble control feature on any of the JC-120s?

Just curious.

[teemuk]

The JC-120H is, as far as I know, the only JC-120 amp that has it.

[oc disorder]

does any one have the schematic?


http://music-electronics-forum.com/t37207/


And here's the owners manual for no particular reason !


JC-55_77_Owners Manual.zip