Marshall JCM800 2203 Manual

SPECIFICATION

The JCM 800 series is arguably one of the most successful ranges in Marshall's history. It is instantly recognisable with both full, rich cleans and driven, aggressive tones. It features a master volume, versatile EQ settings including presence control, and a preamp volume control. This reissue also features an added effects loop and DI out.

FRONT PANEL FUNCTIONS

1. POWER SWITCH
   Turns the amp on and off.
2. STANDBY SWITCH
   The standby switch is used in conjunction with the power switch to 'warm up' the amp before use.
   Always turn the power on for two minutes before switching the standby switch to the '1' position.
   The standby switch should be set to the '0' position during breaks in performances instead of leaving the amp on full power.
3. PRESENCE
   Adjusts the high frequencies of the power amp. Increasing the high frequencies adds more bite to your sound.
4. BASS
   Adjusts the low frequencies of the amp. It will add bottom end and depth to your sound.
5. MIDDLE
   Adjusts the mid frequencies of the amp, giving you anything from scooped mids to a fat and full sound.
6. TREBLE
   Adjust the upper frequencies of the amp. Your tone will get brighter as it is turned up.
7. MASTER VOLUME
   Adjust the amps output volume.
8. PREAMP VOLUME
   This controls the input gain level of the preamp. This allows you to overdrive the amp to create distortion.
9. HIGH INPUT
   High sensitivity guitar input socket. This input gives higher gain response (less headroom, more distortion).
10. LOW INPUT
    Low sensitivity guitar input socket. This input gives lower gain response (more headroom, less distortion).
    Note: you may want to choose which input channel you use to complement the output signal of your guitar. For example, high output ('hotter') guitars may benefit from the extra headroom in the low input. Conversely, lower output guitars may benefit from the extra gain in the high input channel.

REAR PANEL FUNCTIONS

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 (+4dBu: 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 signal from effects loop or outboard equipment.
4. EFFECTS LOOP SEND
   Sends signal to effects loop/outboard equipment.
5. SPEAKER OUTPUT
   Connect one or two speaker cabinets here using 1/4" jack speaker cables.
6. SPEAKER OUTPUT

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, the selector should be set to 16Ω.
   • If running into two 16Ω cabs, the selector should be set to 8Ω.
   • If running into two 8Ω cabs, the selector should be set to 4Ω.

failure to comply with these points will result in damage to the amp.

8. MAINS SELECTOR
   Matches the amp 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.
   Note: adjustment from 230/220V to 110V or vice versa will require the mains fuse to be changed to the corresponding value as detailed on the rear panel.
9. POWER INLET
   The supplied mains power lead is connected here.
10. MAINS FUSE
    The correct value of mains fuse is specified on the rear panel.
11. H.T. FUSE
    The correct value of H.T. fuse is specified on the rear panel.

SAFETY INSTRUCTIONS

Please read this manual carefully before plugging in. Follow all instructions and heed all warnings.

MAINS ELECTRICITY SUPPLY AND OUTPUT IMPEDANCE

Your amp can be used with any one of three different mains electricity supply settings: 110V, 220V or 230V. You should set the mains selector in accordance with your mains electricity supply. Also check the value and type of mains fuse fitted.
For each of the settings above, the correct value and type of mains fuse is specified on the rear panel of your amp. Never attempt to bypass any fuse or fit one of the incorrect value or type.
The output impedance selector should be set to the total impedance of the speaker cabinet(s) (or load) being used.
If you have any doubt regarding your mains electricity supply or the impedance of speaker cabinet(s), please seek help from a qualified engineer – your Marshall dealer can help you with this.

your amp must be switched off and disconnected from the mains electricity supply before you:

• change the mains selector for a different setting; and/or
• check and/or change any fuse; and/or
• change the output impedance selector for a different setting.

Failure to comply with any of the points above may damage your amp.

IMPORTANT SET UP INFORMATION

1. Set the output impedance selector to the impedance of the combined load of the speaker cabinet(s) you will be using.
2. Connect one or two speaker cabinets to the speaker outputs.

failure to do the above may damage your amp. When connecting a speaker cabinet make sure that you use a proper speaker cable. Never use a screened (shielded) guitar cable for this purpose.

3. Ensure that both the power switch and standby switch are set to the off position.
4. Connect the supplied mains (power) lead into the power inlet on the rear panel first and then into an electricity outlet.
5. Ensure that any master, volume and/or output level controls on the front panel are set to zero.
6. Plug your guitar into one of the inputs on the front panel.
7. Turn the power switch on and wait a couple of minutes.
8. Turn the standby switch on.
9. Turn the volume up to your preferred level and you're ready to play.

TRANSPORTING YOUR EQUIPMENT

Please ensure that your amp is switched off, unplugged from the mains electricity supply and all removable cables have been disconnected from your equipment before attempting to move it.
Only move the amp on its own. Do not attempt to move it while it is stacked on top of a cabinet or other equipment.

Documents / Resources

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