Manley MAHI MONOBLOCK AMPLIFIER - Manual (Page 4)

MAINS CONNECTIONS
Your MAHI's have been factory set to the correct mains voltage for your country. (Well, that is what we intended to
do when we knew where they would be initially shipped.) The mains voltage that we built these MAHI's to operate
with is marked on the serial badge, located on the rear of the chassis. Check that this complies with what comes out
of your wall.
There is no voltage changeover switch! The power transformer's primaries must be either wired in parallel for 120v
operation or in series for 230v or 240v countries so be sure to check the sticker and the serial number voltage
indication for proper mains voltage. Failure to properly comply with mains voltage requirements can cause exten-
sive damage to the system, which of course would not be covered by the warranty. If you relocate from, say, a 120v
country to a 240v country, you will need us to rewire the MAHI's power transformer for you or get instructions from
us to perform this operation if you happen to be as good at soldering as we are, or know someone who is. We are
not telling you how to do this in this Owner's Manual because you need to pass a battery of tests for us before we
will let you play with soldering inside the amplifiers. Contact [email protected] for more details.
The MAINS FUSE may be checked by first disconnecting the IEC mains cord from the power supply’s power inlet
plug. Then gently push the light grey fuseholder retainer clip located next to the IEC power socket. The fuse and
cap should spring outward toward your fingers. The fixed silver springy looking thing is NOT the fuse. Leave that
alone. The fuse is a glass or white ceramic thing with silver end-caps. Inspect the mains fuse for the proper rating;
change if necessary. Refer to the fuse rating chart in the specifications section of this manual. If you do not know
what a blown fuse looks like, you may measure for continuity across the fuse ends. If your meter reads “OL” when
you measure across the fuse, that means “Open Leads” and that would mean the fuse is blown. A blown fuse usually
indicates A Very Bad Thing occurred. If this has happened to you, try to figure out why it may have happened.
(Using a Fast Blow fuse when we have specified a SLO-BLO fuse is one reason, output tubes running away into
never-never land are another reason.) If you have no idea why a fuse might have just blown on its own, you might
want to consult with Manley Labs or your dealer for further advice as Something Very Bad might have occured, like
the power transformer might have decided to retire early.
One way this could happen is by running the wrong mains voltage into the unit. Be sure not to do that.
If you live in a strange place...
Export units for certain markets have a moulded mains plug fitted to comply with local requirements. If your unit
does not have a plug fitted the coloured wires should be connected to the appropriate plug terminals in accordance
with the following code.
GREEN/YELLOW EARTH terminal
BLUE NEUTRAL terminal
BROWN LIVE terminal
As the colours of the wires in the mains lead may not correspond with the coloured marking identifying the termi-
nals in your plug proceed as follows;
The wire which is coloured GREEN/YELLOW must be connected to the terminal in the plug which is marked by
the letter E or by the safety earth symbol or coloured GREEN or GREEN and YELLOW.
The wire which is coloured BLUE must be connected to the terminal in the plug which is marked by the letter N or
coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal in the plug which is marked by the letter L
or coloured RED.
DO NOT CONNECT OR SWITCH ON THE MAINS SUPPLY UNTIL ALL OTHER
CONNECTIONS HAVE BEEN MADE. (...or else...)
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