Black Box ME445C-530, ME444AE-R3, ME445C-X.21, ME445C-35 Calling Black Box, Local digital loopback

CHAPTER 6: Troubleshooting

4.After the test is complete or the fault has been corrected, restore the DIG button to its normal position.

LOCAL

DTE

DIG

DEPRESSED

XMTR

RCVR

RCVR

XMTR

DATA

CLK

REMOTE

DTE

DATA

CLK

Figure 6-6. Local digital loopback.

6.7 Calling Black Box

If you determine that your line driver is malfunctioning, do not attempt to alter or repair the unit. It contains no user-serviceable parts. Contact Black Box Technical Support at 724-746-5500. The problem might be solvable over the phone.

Before you do, make a record of the history of the problem. We will be able to provide more efficient and accurate assistance if you have a complete description, including:

•the nature and duration of the problem.

•when the problem occurs.

•the components involved in the problem.

•any particular application that, when used, appears to create the problem or make it worse.

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