• We recommend using microSD cards that have been confirmed to operate with this recorder. See the
ZOOM website (zoomcorp.com) for information about microSD cards that have been confirmed to work
with this unit.
Recorded sound cannot be heard or is very quiet
• Confirm that the track faders are not too low. (→ Front and back)
Cannot use tuner
• Confirm that the INPUT A/MIC (built-in) switch is set as intended. (→ Front and back)
Other trouble
The recorder is not recognized by a computer, smartphone or tablet connected
using the USB port.
• Use a USB cable that supports data transfer.
• The operation mode must be set on the R4 to allow the computer, smartphone or tablet to recognize it.
(→ Connecting computers, smartphones and tablets, Transferring files to computers and other devices)
• During use as an audio interface, if the bit depth is set to 32-bit float format, confirm that the computer,
smartphone or tablet and the app support 32-bit float format.
• Even if “ZOOM R4” cannot be selected in the computer Sound settings, the R4 can be used as a 32-bit
float audio interface if it is selected as an audio or input/output device in an app that supports 32-bit
float format.
• A dedicated driver is necessary to use 32-bit float format with Windows. Download the driver from the
ZOOM website (zoomcorp.com).
Battery operation time is short
Making the following settings could increase the battery operation time.
• Correctly set the type of batteries used. (→ Setting the type of batteries used)
• Turn off unused inputs. Stop phantom power supply to unused inputs. (→ Making input settings)
• Set the display to dim when no operation is conducted for a certain amount of time. (→ Setting display
power saving)
• Reduce the display brightness. (→ Setting the display brightness)
• Due to their characteristics, using rechargeable nickel metal hydride batteries (especially high-capacity
ones) or lithium batteries should enable longer use than alkaline batteries when power consumption is
high.
Date and time are frequently reset
• If power is not supplied by an AC adapter or batteries for some time, date and time settings will be reset.
If the Date/Time Setting Screen appears during startup, set them again. (→ Setting the date and time)
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