Rear Panel Functions - Marshall Amplification 1987X Quick Start Manual

REAR PANEL FUNCTIONS

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1. EFFECTS LOOP LEVEL
Choose between the two different loop levels
to match the type of effect(s) connected to the
effects loop. The higher level (+4dBV: switch
'out') suits rack processors and the lower level
(-10dBV: switch 'in') suits floor pedals.
2. EFFECTS LOOP BYPASS
Engages/disengages the effects loop. The
effects loop is engaged when the switch is
pressed inwards.
3. EFFECTS LOOP RETURN
Returns from effects loop or outboard
equipment.
4. EFFECTS LOOP SEND
Sends to effects loop or outboard equipment.
5 & 6. SPEAKER OUTPUTS
Connect one or two speaker cabinets here
using 1/4" jack speaker cables.
Warning:
always ensure the output impedance
selector is set to the appropriate impedance for
the load of your setup (speaker cabinets). Never
use this amp without a speaker or load.
7. OUTPUT IMPEDANCE SELECTOR
Matches the amp's output to the load
impedance. Ensure the amp is completely
powered down before turning the selector.
The impedance selected on the amp must
match the total impedance of the speaker
cabinet(s) being used. Common setups include:
• If the amp is running into a single 16Ω cab,
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• If running into two 16Ω cabs, the selector
• If running into two 8Ω cabs, the selector
Warning: failure to comply with these points
may damage the amp.
8. MAINS SELECTOR
Matches the amp's mains transformer voltage to
the incoming mains voltage. The mains selector
must be set to the voltage of the mains supply.
Your amp should be completely powered down
before the selector is turned.
Warning: for each voltage setting, the correct
value and type of mains fuse and H.T fuse
must be fitted. Adjustments from 230/220V to
110V or vice versa will require the mains fuse
to be changed to the corresponding value as
detailedon the rear panel. For more information,
please refer to the Mains Electricity Supply and
Output Impedance section of this guide.
9. POWER INLET
The supplied mains power lead is connected here.
10. MAINS FUSE
The correct value of the mains fuse is specified
on the rear panel.
11. H.T. FUSE
The correct value of the H.T. fuse is specified
on the rear panel.
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the selector should be set to 16Ω.
should be set to 8Ω.
should be set to 4Ω.
ENGLISH
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