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CHAPTER 6: Troubleshooting
4. After the test is complete or the fault has been corrected, restore the DIG
button to its normal position.
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.
DIG
DEPRESSED
DATA
CLK
RCVR
DATA
CLK
XMTR
LOCAL
DTE
XMTR
RCVR
REMOTE
DTE