RussellMc wrote:
> I'm repairing a JBL EON Power 15 Powered speaker.
> Unpaid job, of course.
> It blew the fuse and I gave the user two more fuses  which reportedly
> also blew in short order.
>=20
> On examining the speaker I found the power transformer primary was
> open circuit. (Toroidal about 150 VA)

Er, how is it blowing fuses with an open primary? Further investigation
is indicated.

> I've obtained a replacement power transformer, but before fitting I
> wanted to look over the PCB to check for obvious damage.
> PCB and heatsink block lifts clear after  removal of two screwed down
> spring clamps BUT to then  remove the PCB seems to require the removal
> of the driver from the "horn" speaker. The horn body is integral with
> the solidly cast speaker front face and there are no obvious screws.
> It is not clear whether removal requires twisting pulling or general
> beating to death. Modest amounts of each produce no results.

Is the PCB physically blocked by the horn, or is it simply being restrained
by the wires going to the horn? A picture might be helpful.

In the latter case, if there's no connector, it may be necessary to desolde=
r
the wires. In my experience, manufacturers of powered speakers tend to avoi=
d
internal connectors so that vibrations don't introuduce reliability issues.

-- Dave Tweed
--=20
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