X100M1.1ENG
X
100M User manual
11/13
The four E34L/6L6 life is function of the use and of the mean volume and it can be about 6
to 24 months. They must be replaced all four in the same time and a selected, good brand
quartet is strongly recommended. Their replacement necessarily requires the setup of bias
on an internal trimmer; this operation must be done by a qualified technician.
In case of fault of one final tube, external HV fuse and/or some internal fuses could blow
and they must be replaced by qualified personnel.
Manufacturer and selection of tubes (pre and final) have a deep influence on the sound
and they can be chosen following personal attitudes. For more info and tips, please
conctact MGD.
WARNING: tube and fuses replacement, bias set and any other maintenance internal
to X100M must be done exclusively by MGD or qualified and skilled personnel at
least 30 minutes after mains disconnection from the IEC rear socket!
Troubleshooting.
Here we report some possibile problems during X100M use. Don't esitate to contact MGD
for any doubt.
9
X100M does not power on.
Check mains voltage. Check mains cable. Check
mains fuses. If it is blown, replace it with an identical one following the instructions
indicated before. If it is blown again, contact MGD or qualified personnel for
maintenance.
9
At the switch ON, all leds blink for a moment and then they are lit OFF.
X100M
has been switched ON in MIDI program mode with channel selector on CLEAN
position.
9
Channel is correctly selected but there is no sound..
Check cables and jacks
and their insertion. Check level of drive, tones and volume. Check master level on
the rear panel. If tones are all OFF, signal is completely cut
9
X100M does not react to MIDI messages
. Check MIDI cables and connections.
Check channel and mode of pedalboard: channel must be #1, mode must be
Program Change.
9
Noisy pot at rotation.
Absolutely do not attempt to clean it with spray or in any
other way! Please refer to MGD for pot replacement.
9
Sound is bad, the amplifier generates strange noise, hisses or pops.
One or
more tubes are at end of life or they became microphonics. Please contact MGD or
a qualified technician for individuate the defective tube(s) and replace in the best
way.
Fuses.
X100M has 5 fuses:
Internal fuse for final tube heaters: 250V 10A T delayed;
Internal fuse for preamp tube heaters: 250V 2A T delayed;
Internal fuse for bias: 250V 100mA T delayed;
External fuse for HV (anodic voltage): 250V 1A T delayed;
External mains fuse: 4 A T delayed.
If mains voltage has fast and violent oscillation in a few seconds, mains fuse can blow.
Warning: replace external fuses only with identical type and specs ones. Internal
fuses must ne replaced only by qualified personnel!
