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Thank you for selecting the ZOOM 503 (hereafter simply called the "503"). 

Please take the time to read this manual carefully so you can get the most out of
your 503 and ensure optimum performance and reliability. 

Retain this manual for future reference.

ZOOM CORPORATION

NOAH Bldg., 2-10-2, Miyanishi-cho, Fuchu-shi, Tokyo 183-0022, Japan
PHONE: 0423-69-7116 FAX: 0423-69-7115

Printed in Japan 503-5000

• Compact multi-effect device convincingly recreates the sound of famous guitar or bass

amplifiers. This is ideal for line recordings to a tape recorder or when playing your
instrument via a hi-fi audio system. It also lets a fairly small guitar or bass amplifier
sound more powerful and dynamic. 

• Integrated amp simulator gives a wide choice of guitar/bass amplifier characteristics.

Sophisticated cabinet simulator allows control over cabinet size, ringing, and even
simulated microphone position. This makes it easy to create exactly the sound you want. 

• Two input jacks with different sensitivity enable optimum matching to any guitar or

bass, including instruments with single-coil magnetic pickups or active pickups. 

• Ten types of high-quality effects such as chorus, delay, and reverb produce realistic

ambience. 

• You can switch between 24 patches to store diverse settings based on your preference.

• Integrated auto-chromatic tuner for guitar. You can tune your instrument easily

anywhere, any time. You can also leave the tuning function disabled all the time.

• AUX input allows connecting the output of audio components such as a CD player, for

mixing with the instrument signal. 

Dual power supply design allows the unit to be powered from a 9V alkaline battery
(6LR61) or an AC adapter.

USAGE AND SAFETY PRECAUTIONS

In this manual, symbols are used to highlight warnings and
cautions for you to read so that accidents can be prevented. The
meanings of these symbols are as follows:

Please observe the following safety tips and precautions to ensure
hazard-free use of the 503. 

Since power consumption of this unit is fairly high, we
recommend the use of an AC adapter whenever possible.
When powering the unit from a battery, use only an alkaline
type. 

AC adapter operation 

Be sure to use only an AC adapter which supplies 9 V DC,
300 mA and is equipped with a "center minus" plug (Zoom
AD-0006). The use of an adapter other than the specified type
may damage the unit and pose a safety hazard. 

Connect the AC adapter only to an AC outlet that supplies the
rated voltage required by the adapter. 

When disconnecting the AC adapter from the AC outlet,
always grasp the adapter itself and do not pull the cable. 

If the unit is not to be used for a long time, disconnect the AC
adapter from the outlet. 

Battery operation 

Use only a 9 V (alkaline) battery (6LR61). 

The 503 cannot be used for recharging. 
Pay close attention to the labelling of the battery to make sure
you choose the correct type. 

If the 503 is not to be used for an extended period of time,
remove the battery from the unit. 

If battery leakage has occurred, wipe the battery compartment
and the battery terminals carefully to remove all remnants of
battery fluid. 

While using the unit, the battery compartment cover should
be closed. 

Avoid using your 503 in environments where it will be
exposed to: 

Extreme temperature 

High humidity or moisture 

Excessive dust or sand 

Excessive vibration or shock 

The 503 is a precision instrument. Except for the foot
switches, do not push other parts with your feet or subject
them to strong force. 

Take care that no foreign objects (coins or pins etc.) or liquids
enter the unit. 

Be sure to turn the power to all equipment off before making
connections. 

Before moving the unit, turn the power off and disconnect all
cables and the AC adapter. 

Never open the case of the 503 or attempt to modify the
product in any way since this can result in damage to the unit. 

Usage precautions 

For safety considerations, the 503 has been designed to provide
maximum protection against the emission of electromagnetic
radiation from inside the device, and from external
interference.However, equipment that is very susceptible to
interference or that emits powerful electromagnetic waves
should not be placed near the 503, as the possibility of
interference cannot be ruled out entirely.

Whatever the type of digital control device, the 503 included,
electromagnetic damage can cause malfunctioning and corrupt
or destroy data.  Since this is an ever-present danger, thorough
care should be taken to minimize the risk of damage.

Use a soft, dry cloth to clean the 503. If necessary, slightly
moisten the cloth. Do not use abrasive cleanser, wax, or
solvents (such as paint thinner or cleaning alcohol), since these
may dull the finish or damage the surface.

Connecting cables and input and output jacks 

You should always turn off the power to the 503 and all other
equipment before connecting or disconnecting any cables. Also
make sure to disconnect all cables and the AC adapter before
moving the 503. 

Features 

Safety Precautions 

Warning

This symbol indicates explanations about extremely
dangerous issues. If users ignore this symbol and handle
the device incorrectly, serious injury or death could
result.

Caution

This symbol indicates explanations about dangerous
issues. If users ignore this symbol and handle the
device the wrong way, bodily injury and damage to the
equipment could result.

Warning

About power

Caution

Environment 

Caution

Handling

Caution

Alterations

Electrical interference 

Cleaning 

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Operation Manual

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