Quested S8 User Manual - page 8
8
continue to meet its specifications. (See power requirements on page 12 of his manual.) For
the 230V setting this is 160V to 255V and for the 115V setting it is 80V to 127V. If the unit is
connected to voltages in excess of its maximum, damage is likely to occur which may not be
recoverable from without qualified service attention.
To change the set voltage, the amp must be removed from the speaker. The power and
signal cables must be disconnected before continuing. Remove the 6 x M4 socket screws from
the left and right hand side edges of the amplifier. Carefully remove the back-panel and you
will see 4 wires and one 3-way cable form connecting to the amplifier with various connectors.
Note the orientation and position of them all and then disconnect. If you look at the
amplifier, you will see a PCB mounted on the rear of the IEC inlet connector. Marked on the
PCB you will see the 2 terminals marked with the set voltage (see diagram). Locate and move
the connectors to the other voltage tap, noting that the coloured wires correspond with the
printing on the PCB. Reconnect the wires from the cabinet to the amplifier and replace the
amplifier using the 6 bolts. You must now change the fuse located in the IEC inlet socket for
the correct one as indicated on the back panel. IT IS IMPORTANT THAT YOU NOW
MARK THE REAR OF THE
UNIT WITH THE NEW SET VOLTAGE
.
Exploded view of small PCB viewed from above showing the voltage selection connectors with
alternative pins for the 115V and 230V settings.
4.5.3 Fuse Setting
It is very unlikely the fuse will fail during normal use, but should this
occur the situation must
be approached with some caution. Check that the mains voltage setting is correct for
your
installation supply and that the original fuse was the correct rating. (See 9.2 Spares) The fuse
may blow if the unit is subjected to mains power surges or spikes, or if the mains wiring has
any poor or faulty connections, in which case a qualified electrician should be consulted. Very
occasionally a fuse can become degraded after many years of service and simply replacing it
with a new one will restore the system.
The fuse is housed in a unit integral with the IEC inlet connector (see rear panel drawing page
of this manual). To gain access to the fuse remove the power cord and unclip the fuse carrier
using a flat blade. A spare fuse of the correct rating is also provided within the same carrier. If
none of the above is the cause of the fault it is likely that the unit has suffered an internal
component failure and will need returning to a qualified agent for servicing IF THE
REPLACEMENT FUSE SHOULD FAIL DISCONNECT FROM THE MAINS
IMMEDIATELY AND HAVE
THE UNIT PROFESSIONALLY REPAIRED BEFORE ATTEMPTING TO USE IT.
4.6 Audio connections
The audio signal input is RF filtered and electronically balanced to ensure a high level of rejection