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JMD:1 Rear Panel
MODEL: JMD102
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1. Mains Input & Fuse
Your amp is provided with a detachable mains (power)
lead, which is connected on the rear panel. The specific
mains input voltage rating that your amplifier has been
built for is indicated on the back panel.
WARNING: Before going any further, make sure your
amplifier is compatible with your electrical supply. If you
have any doubt, please get help from a qualified
technician, your Marshall dealer can help you in this
respect.
The correct value of mains fuse, located in the small
drawer at the bottom of the mains socket, is also
specified on the rear panel of the amplifier. The drawer
also contains one spare fuse.
Note: It is wise to carry spare fuses at all times.
NEVER attempt to bypass the fuse or fit one of the
incorrect value.
2. MIDI In & MIDI Thru
Connect any external MIDI devices to the MIDI In DIN
socket. A copy of the signal entering this connector will be
available on the MIDI thru socket to allow daisy chaining
of MIDI equipment.
Note: The JMD:1 only accepts and retransmits incoming
data. It is not designed to generate its own MIDI
commands. See the Footcontroller & MIDI section of this
handbook for more information.
3. Footcontroller
Connect the supplied footcontroller using any standard
¼" jack mono lead, e.g. a guitar lead. Using any other
type of footswitch other than the supplied will have no
effect and will be ignored by the amplifier. See the
Footcontroller & MIDI section of this handbook for more
information.
4. Emulated Line Out
An electronically balanced pre-amp signal, processed
All manuals and user guides at all-guides.com
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through a power amp, 4x12" speaker cabinet and
microphone emulation is made available at this
connector. It is also available at the Headphones output.
IMPORTANT: This output cannot be muted when the
amplifier is switched off. To prevent loud pop noises on
power down, disconnect before switch off or switch off
external equipment first.
5. Headphones
Headphone output providing the JMD:1's pre-amp
processed through a power amp, 4x12" speaker cabinet
and microphone emulation.
6. Line In
Connect an external audio source such as an MP3, CD or
tape track. This signal will appear on the Headphones
output only, to allow private practice.
7. Pre-amp Out
Output providing a direct feed from the JMD:1s pre-amp
for connection to an external power amplifier.
Note: The External FX Loop, Emulated Line Out,
Headphones, Line In and Pre-Amp Out are still
operational when the JMD:1 is in standby, allowing you to
use the amplifier in silent recording mode.
8. Serial / Parallel FX Loop
The JMD:1 is equipped with a programmable serial /
Mix, FX Level, Return and Send
parallel FX Loop. Connect your external FX device input
to the JMD:1's Send socket and the device's output to the
JMD:1's Return socket. As described previously, this
FX Loop can be bypassed and programmed from the
front panel.
The +4dBu/-10dBV switch allows you to configure the
loop for use with either professional equipment (+4dBu
setting) or with guitar level effects like effects pedals
(-10dBV setting). When Mix is set to Wet, all the signal
goes through the external loop, adding more direct
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(unprocessed) signal as you turn it towards Dry. This
allows you to mix any amount of the external effect
without losing or degrading the direct signal quality.
When mixing the Wet and Dry signals, the external effects
processor's output should be configured to remove the
direct (unprocessed) signal because unpleasant phasing
effects may occur when mixing it again in the amplifier.
Note: The position of the Mix control is storable and its
current setting may not reflect the physical position of the
control when you have changed to a new preset. If you
are having problems with the FX Loop, always turn the
Mix control first to ensure it is set to the value you expect.
9. Speaker Outputs
WARNING! Never switch the Standby to On without a
load (speaker cabinet/s) attached!
There are three speaker outputs available on the rear
panel, they are labelled according to the intended
impedances:
1x16 Ohm: Connect to this output when only using a
G
single 16 Ohm cab.
1x8 Ohm / 2x16 Ohm: Connect a single 8 Ohm guitar
G
cabinet to one of these sockets or two 16 Ohm cabinets.
WARNING: Although there are three speaker outputs,
never attempt to connect more speakers than rated. The
safe combinations are 1x16 Ohm or 1x8 Ohm or 2x16
Ohm only. Any other speaker configuration may stress the
power amplifier section and, in extreme cases, may lead
to valve and/or output transformer failure.
JMD:1 combo amplifiers internal speaker(s) must be
connected to the socket marked 'Internal Speaker(s)'
only.
ALWAYS ensure you use good quality speaker
(unshielded) cables. NEVER use guitar (shielded) cables.
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ALWAYS use a non-screened Marshall approved speaker
lead when connecting an extension cabinet to these
amplifiers.
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