Bedienungsanleitung Marshall JCM 900 valve series SL-X Master Volume Dual Reverb (Seite 6 von 7) (Englisch)

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WARNING!

PLEASE READ THE FOLLOWING LIST CAREFULLY

A. ALWAYS fit a good quality mains plug conforming to the latest B.S.I.

standards (UK only).

B. ALWAYS wire the plug in accordance with the colour code attached to

the mains lead (UK only).

C. DO NOT attempt to remove the amplifier chassis. There are no user

serviceable parts inside.

D. ALWAYS have this equipment serviced or repaired by competent,

qualified personnel.

E. NEVER under any circumstances, operate the amplifier without an earth.

F. NEVER use any amplifier in damp or wet conditions.

G. ALWAYS ensure that the impedance of the amplifiers speaker or

speakers connected does not fall below the minimum impedance rating.

I. PLEASE READ this instruction manual carefully before switching on.

INTRODUCTION

Marshall have specialised in the production of valve amplification

since 1962.

The unique tone and playing response of the valve has formed the

cornerstone of the Marshall “Sound of Rock”, which we have modified over

the years to cope with the changing demands of the evolving guitar player.

The JCM 900 models split into two distinct product ranges, the Master

Volume SL-X and the Dual Reverb. Though they share common ancestry

and have similar rear panel functions their applications are quite different.

REAR PANEL FUNCTIONS

The Hi Gain Master Volume SL-X and Dual

Reverb models feature comprehensive connection

and control facilities on the rear panel which are

common to both ranges.

50 Watt Models 2500, 4500,

4501 & 4502

1. Effects Loop Level Control

Adjusts the level of the effects loop from -10dBV

to + 4dBm. Higher settings match modern effects

processors and lower settings match floor pedals.

NOTE:

Some effects such as distortion and compression

are best suited to connection via the front panel

input as opposed to the loop.

2. Effects Send Socket

Jack socket for connection to the input of external

effects processor.

3. Effects Return Socket

Jack socket for the connection from the output of

external effects processor.

4. Recording Compensated Line-Out

Socket

Jack socket for direct connection to recording

equipment or PA system. The signal is specially

filtered for optimum recording performance.

5. Direct Line-Out Socket

Unfiltered pre-amp signal for connection to

external power amplifiers.

6. Impedance Selector Switch

Two-way switch for matching the amplifier to

speaker impedance. Amp heads feature 8 or 16

Ohm operation. Combo versions feature 4 or 8

Ohm options.

7. Loudspeaker Output Jack Sockets

Parallel wired jacks for linking speaker cabinets.

Ensure that the speaker system is easily capable of

handling the full amplifier power and that the

impedance (item 6) is correctly selected. If in doubt

consult your dealer.

8. Output Mode Switch

Switches the amplifier from high to low power

output. The “low” setting configures the output

stage to “triode” operation, which gives half the

rated output (i.e. 25 Watts on 50 Watts models - or

50 Watts on 100 Watt models). The “high” power

position gives “pentode” operation for the full

rated output.

9. Valve Failure L.E.D.

Indicates red when output valve fails and causes

valve fuse (item 10) to operate.

10. Valve Failure Fuse

Operates in the event of an output valve failure and

prevents any internal damage to the amplifier.

NOTE:

On 50 Watt models items 11 & 12 DO NOT

appear.

13. Mains Power Input

Connects the amplifier to the mains power supply.

NOTE:

Always ensure that the incoming mains voltage

matches that of the amplifier. If in doubt consult

your Marshall dealer.

14. Mains Power Fuse

Protects the amplifier and mains supply in the

event of a fault.

NOTE:

Always ensure that the fuse value matches the

labelling on the amplifier rear panel. If in doubt

consult your dealer.

REAR PANEL FUNCTIONS

100 Watt models 2100, 4100,

4101 & 4102

Items 1 to 8 follow the same format as the 50 Watt

models.

9 & 10. Valve Failure LED (OPV1-OPV4)

Valve Fuse (OPV1-OPV4)

In the case of output valve failure (OPV1-OPV4),

the fuse (item 10) will operate and illuminate LED

(item 9). The amplifier will continue to function on

reduced power (Using OPV2-OPV3 Only). Service

should be obtained as soon as possible to prevent

the premature ageing of (OPV2-OPV3).

11 & 12. Valve Failure LED (OPV2-OPV3)

Valve Fuse (OPV2-OPV3)

Similar functions to items (10) and (11) but

operating on OPV2 and OPV3.

13. Mains Power Input

Connects the amplifier to the mains power supply.

NOTE:

Always ensure that the incoming mains voltage

matches that of the amplifier. If in doubt consult

your Marshall dealer.

14. Mains Power Fuse

Protects the amplifier and mains supply in the

event of a fault.

NOTE:

Always ensure that the fuse value matches the

labelling on the amplifier rear panel. If in doubt

consult your dealer.

SL-X hbk 4/3/05 12:22 pm Page 6

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Marshall JCM 900 valve series SL-X Master Volume Dual Reverb Seite 6

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