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LED
Status
Description
Drive
Green
The drive is ready.
Flashes Green
The drive is being accessed.
Red
The drive has encountered an error.
Flashes Red 5 times per
second
The drive is being located in the operating system.
Off
No drive is detected.
Expansion LED
Amber
A USB JBOD, SAS JBOD, or REXP is connected.
Off
No JBOD is connected.
PSU LED
Green
Power is being supplied to the PSU and the NAS is
powered on.
Amber
Available on the following
models:
• TS-853BU
• TS-853BU-RP
• TS-1253BU
• TS-1253BU-RP
Power supply failure.
Off
No power is supplied to the PSU or the NAS is powered
off.
Beep Alarm
Duration
Frequency
Description
Short beep (0.5 seconds) 1
• The NAS is starting up.
• The NAS is shutting down (software shutdown).
• The user pressed the Reset button.
• The operating system was updated.
3
The user tried to copy the NAS data to the external
storage device from the front USB port, but the data
cannot be copied.
TS-x53BU User Guide
Basic Operations
41