Zoom U-22 Service Manual

Operation Manual

Copying or reprinting this manual in part or in whole without permission is prohibited.

© 2016 ZOOM CORPORATION

Introduction / Safety and Usage Precautions

Warning

Caution

Contents

Introduction …………………………………………… 2

Safety and Usage Precautions …………………… 2

Part Names …………………………………………… 4

Connecting with a Computer/iPad ………………… 6

Recording ………………………………………………10

Playback ………………………………………………12

Troubleshooting ………………………………………14

Specifications …………………………………………15

Introduction

Thank you for choosing the ZOOM Handy Audio Interface.
To achieve the best results—and to protect your investment—please read this manual carefully and retain
it for future reference.
Use this product only as directed.

2-in/2-out Mobile Audio Interface

The is a high-quality mobile audio interface that supports recording and playback at resolutions
up to 24-bit/96 kHz.
Since the can run on batteries as well as bus power, you can make music with it anywhere.
The is compatible with Mac, PC and iPad.

Attention to Audio Performance

Featuring an asynchronous transfer system, the
audio with complete accuracy.

High-Performance Mic Preamp

The is equipped with a high-performance mic preamp based on those found in our acclaimed
H-Series recorders.
The input features +48V phantom power, and a designated MIC/Hi-Z jack supports high impedance
input.

Safety and Usage Precautions

Safety Precautions

In this operation manual, symbols are used to highlight
warnings and cautions that you must read to prevent
accidents. The meanings of these symbols are as follows.

Something that could cause serious injury or
death

Something that could cause injury or damage
to the equipment

Other symbols used

An action that is mandatory

An action that is prohibited

is not impacted by computer jitter, and reproduces

Alterations

Do not open the case or modify the product.

Operation using an AC adapter

Never use any AC adapter other than a ZOOM AD-17.

Always hold the AC adapter itself when disconnecting it

from an outlet.

Operation with external DC power supply

Use a 5V external DC power supply.

Carefully study the warning indications of the external DC

power supply before use.

Operation using batteries

Use 2 ordinary 1.5-volt AA batteries (alkaline or nickel-

metal hydride).

Read battery warning labels carefully.

Always close the battery compartment cover when using

the unit.

2 3

Warning

Safety and Usage Precautions (continued)

Safety and Usage Precautions

Product handling

Do not drop, bump or apply excessive force to the unit.

Be careful not to allow foreign objects or liquids to enter
the unit.

Battery handling

Install the batteries with the correct +/− orientation.

Use a specified battery type.

Do not mix new and old batteries or different brands or

types at the same time.

When not using the unit for an extended period of time,
remove the batteries.

If a battery leak should occur, wipe the battery

compartment and the battery terminals carefully to
remove all residue.

Operating environment

Do not use in extremely high or low temperatures.

Do not use near heaters, stoves and other heat sources.

Do not use in very high humidity or where it could be splashed
by water.

Do not use in places with frequent vibrations.

Do not use in places with much dust or sand.

Connection cables and input/output jacks

Always turn the power OFF for all equipment before
connecting any cables.

Always disconnect all connection cables and the AC
adapter before moving the unit.

Volume

Do not use at a loud volume for a long time.

Usage Precautions

Interference with other electrical equipment

For safety considerations,
the emission of electromagnetic waves and suppress
interference from external electromagnetic waves.
However, interference could still occur if
next to equipment that is very susceptible to interference
or that emits powerful electromagnetic waves.
If this occurs, place the
apart.
With any type of digital control device-including the

-electromagnetic interference can cause malfunction,
corrupt or destroy data, or cause other unexpected
issues. Always exercise caution.

Cleaning

Use a soft cloth to clean the exterior of the unit if it
becomes dirty.
If necessary, use a damp cloth that has been wrung out
well to wipe it.
Never use abrasive cleansers, wax or solvents such as
alcohol, benzene or paint thinner.

Temperature considerations

The

may become warm after long periods of
continuous use. This is normal, as long as the unit does
not become too hot to touch.

Caution

is designed to minimize

is placed

and the other device farther

Breakdown and malfunction

If the

malfunctions or operates abnormally,
disconnect it immediately. Contact the store where you
purchased the unit, or contact ZOOM customer service
with the following information: product model, serial
number, and the specific symptoms of the breakdown
or malfunction—along with your name, address, and
telephone number.

Copyrights

®

• Windows

is a registered trademark of Microsoft®

Corporation.

®

• Mac

, iPad® and Lightning™ are trademarks or registered

trademarks of Apple Inc.

• MIDI is a registered trademark of Association of Musical

Electronics Industry (AMEI).

• Other product names, registered trademarks and company

names in this document are the property of their
respective companies.

Note: All trademarks and registered trademarks in this

document are for identification purposes only and
are not intended to infringe on the copyrights of their
respective owners.

Recording for any purpose other than personal use from
copyrighted sources, including CDs, records, tapes, live
performances, video works and broadcasts, without
permission of the copyright holder is prohibited by law.
ZOOM Corporation will not assume any responsibility
related to infringements of copyrights.

FCC regulation warning (for U.S.A.)

This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed
to provide reasonable protection against harmful
interference in a residential installation. This equipment
generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications. However, there is no guarantee that
interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio
or television reception, which can be determined by
turning the equipment off and on, the user is encouraged
to try to correct the interference by one or more of the
following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and
receiver.

•

Connect the equipment to an outlet on a circuit

different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV
technician for help.

For EU Countries

Declaration of Conformity

Part Names

Part Names

To p

OUTPUT knob

GAIN knob

Level indicator

Back

Power indicator

48V indicator

OUTPUT jacks USB 2.0 port

DC 5V connector

4 5

XLR TRS

3：COLD

TIP：HOT
RING：COLD

SLEEVE：GND

2

3

Part Names (continued)

Right side

Part Names

POWER SOURCE switch

48V switch

DIRECT MONITOR switch

Front

MIC/Hi-Z jack

LINE IN jack PHONES jack

1

1：GND
2：HOT

Connecting with a Computer/iPad

Installing the Driver

Do not connect the until installation completes.

Windows

1. Download the ZOOM U-22 Driver from http://www.zoom.co.jp/ to your

computer.

NOTE

• You can download the latest ZOOM U-22 driver from the above website.

Installing the Driver

• Download the appropriate dri ver for your operating system.

2. Launch the installer and install the driver.

Follow the on-screen instructions to install the ZOOM U-22 driver.

NOTE

• See the Installation Guide included in the driver package for detailed installation
procedures.

Mac

Driver installation is not necessary when using a Mac.

6 7

Choosing a Power Source

Using bus power

Use a USB cable to connect the to the computer.

<Back>

Using batteries

1. Open the battery cover on the underside of the .

2. Install the batteries.

3. Replace the battery cover.

NOTE

• Use only alk aline batteries or rechargeable NiMH batteries.

• The power indicator will blink when the battery charge becomes low. Turn the power
off immediately and install new batteries.

Connecting with a Computer/iPad

Choosing a Power Source

Using an external power supply

Connect either the optional AD-17 adapter, a commercially available USB power
adapter, or a mobile USB battery to the DC 5V connector.

<Back>

Connecting with a Computer/iPad

Connecting with a Computer

1. Minimize the volume of any output devices connected to the .

2. Use a USB cable to connect the to the computer.

<Back>

Connecting with a Computer

3. Set to USB or BATTERY/DC IN [TABLET] to turn the power on.

NOTE

• When using batteries or an external power supply, set to BATTERY/DC IN
[TABLET].

4. Confirm that the power indicator is lit.

8 9

iPad Connection

You can connect the to an iPad when using either the optional AD-17 power
adapter, an external DC power supply, or AA batteries.

1. Minimize the volume of any output devices connected to the .

2. Install batteries or connect an external power supply. (→ P. 7)

Connecting with a Computer/iPad

3. Connect the to the iPad using an Apple iPad Camera Connection Kit or

Lightning to USB Camera Adapter.

<Back>

4. Set to BATTERY/DC IN [TABLET].

<Right side>

After the turns on, it will connect to the iPad.

NOTE

• cannot accept bus power from an iPad.

5. Confirm that the power indicator is lit.

iPad Connection

Connecting Instruments and Mics

Recording

Use a mono instrument/XLR cable to connect an instrument or mic to the MIC/Hi-Z
jack.
Use a stereo mini cable to connect an iPad or other device to the LINE IN jack.

<Front>

Connecting Instruments and Mics

Tablet or other device

(stereo mini cable)

Bass guitar

Guitar

(mono instrument cable)

NOTE

· The MIC/Hi-Z jack is disabled when a cable is connected to the LINE IN jack.

· The Hi-Z function will turn ON automatically when a mono instrument cable is
connected.

Using Phantom Power

Supply phantom power when using a condenser mic.

1. Connect a condenser mic.

2. Set to ON.

3. Confirm that the 48V indicator is lit.

Condenser mic

Dynamic mic

(XLR cable)

10 11

Connecting Instruments and Mics (continued)

Adjusting Input Gain

You can adjust the MIC/Hi-Z jack gain.

1. Use the level indicator to check the input

signal status.

Green light: Input signal is present.
Red light: Input signal is clipping.

2. Adjust the input gain.

Turn the .

HINT

• To avoid distorted recordings, adjust the input gain so the level indicator doesn't light
up red.

NOTE

• The gain is fixed for the LINE IN jack.

Recording

Connecting Instruments and Mics

Connecting Headphones and Speakers

<Back> <Front>

Playback

Connect headphones to the PHONES jack, speakers to the OUTPUT jacks, and adjust
the volume levels accordingly.

1. Connect headphones or speakers.

Connecting Headphones and Speakers

Speakers

2. Adjust the headphones/speakers volume.

Turn the .

12 13

Headphones

Using Direct Monitoring

Direct monitoring enables you to listen to input signals before they pass through the
computer.
This allows you to hear the sound coming into the

1. Set to ON.

without latency.

<Right side>

Playback

Using Direct Monitoring

Troubleshooting

Troubleshooting

Cannot select or use the device

• C onfirm th at the is connected to the

computer correctly.

• Q uit all the s oftwar e that is using t he

then disconnect and reconnect the USB cable

connecte d to .

• Reinst all the driver.

• C onnect the

computer. Do n ot connec t it to a USB hub.

directly t o a USB por t on the

Playback sound cannot be heard or is quiet

• C heck the headphone or speaker connections.

• I f no sound c an be heard o r the volume is l ow

from the PH ONES or O UTPU T connec tors,

adjust the O UTPUT knob.

• C onfirm that the Sound setting of the computer

that you are us ing is set to "ZO OM U-22".

Recorded audio is too loud, too quiet or
silent

• Adjust the input gain of the .

• When using a condenser mic, set the 48V switch

to ON.

• Confirm that the Sound setting of the computer

that you are using is set to "ZOOM U-22".

The sound of the device connected to the

input jack is distorted

• Confirm that the level indicator is not lighting red.

If it is, lower the input level.

• If the sound of the device connected to the LINE

IN jack distorts, reduce the output volume of that

device.

Sound skips during playback or recording

• I f you can adj ust the audi o buffer si ze of the

softwa re that you are u sing, incr ease the buf fer

size.

,

• Turn the automatic sleep function and other

computer p ower saving setting s OFF.

• C onnect the

computer. Do n ot connec t it to a USB hub.

directly t o a USB por t on the

Cannot play or record

• C onfirm that the Sound setting of the computer

that you are us ing is set to "ZO OM U-22".

• C onfirm th at

the soft ware you are using.

• Confirm that

correctly.

• Q uit all the s oftwar e that is using t he

then disconnect and reconnect the USB cable

connecte d to .

is set for input and output in

is connected to the computer

Cannot use with an iPad

• C onfirm th at the bat teries are lo aded or th e

external p ower supply is conne cted corre ctly. (

P. 7 )

• S et the POW ER SOUR CE switch to B ATTER Y/

DC IN [TA BLET ] to turn the power on.

,

→

14 15

Specifications

ANALOG INMIC/Hi-Z Specifications TRS/XLR combo jacks

Input gain 0 – 43 dB

Input impedance 2.6 kΩ (MIC)

Maximum input level -0.8 dBu (MIC) / +8.7 dBu (Hi-Z)

LINE IN Connector Stereo mini jack

ANALOG
OUT

Frequency characteristics 44.1 kHz: ±1.5 dB (20 Hz - 20 kHz)

Input conversion noise Measured EIN: -120 dB or less (IHF-A)

Number of audio recording and playback
channels

Sampling frequencies 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz

Bit depth 24-bit

Interface USB2.0

Power Source USB bus power (Type B)

Power consumption 5 W maximum

Dimensions 119.2 mm (D) ×91.8 mm (W) ×44.6 mm (H)

Weight (main unit only) 151 g

* 0 dBu = 0.775 Vrms
Note: The continuous operation time with batteries is just an estimate. This result is from in-house testing

OUTPUT
L/R

PNONES Connector Stereo mini jack

methods. The actual time will vary greatly according to operating conditions.

Phantom power +48 V

Input impedance 22 kΩ

Maximum input level +1.0 dBu

Connector RCA (coaxial)

Maximum output
level

Output impedance 1 kΩ

Output impedance 10 Ω

(XLR: 2 hot, TRS: TIP hot)

484 kΩ (Hi-Z)

-0.8 dBu (@0 dBFS) ( into 10 kΩ load )

10 mW x 2 (into 32 Ω load)

96 kHz: ±2 dB (20 Hz - 40 kHz)

(with 43 dB, 150 Ω input)

Recording: 2 channels

Playback: 2 channels

DC 5 V power supply (Micro-B)
2 AA batteries (about 5 hours continuous operation with
phantom power off)

Specifications

4-4-3 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062 Japan

ZOOM CORPORATION

http://www.zoom.co.jp

Z2I-2735-01