TECHNICAL SUPPORT
Cable Modem: Motorola SB4220 Troubleshooting
► Summary
Troubleshooting
Manufacture Resources
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► Troubleshoot Modem Lights
"Activity" light flashing
► Troubleshooting Diagram:
Modem Light
Status
Problem
Solution
Verify power supply connections and electrical
Off
No power
outlet. Also make sure the outlet is not connected
to a switch.
Power
An error has occurred
Verify coaxial cable connection and try resetting
Flashing
during normal
the Modem.
operation.
Slow
Searching for cable
Verify all cable connections and try resetting
Flashing
connection
Modem.
If this is a new Modem or a replacement Modem,
the customer must contact Suddenlink Technical
Fast
Searching for cable
Support with the MAC address. If there are several
Receive
Flashing
connection
MAC addresses on the Modem, please use the
Modem
No connection
Verify all cable connections and try resetting
Off
Cable connection
modem.
Scanning for the
Verify all cable connections and try resetting
Send
Flashing
upstream frequency
Modem.
Scanning for the
Verify all cable connections and try resetting
Online
Flashing
network connection
Modem.
Activity
Transmitting or
Blinking
No Problem
receiving data
► Back View
► Mac Address Label
