TC1000 (serv.man6) - JBL Audio User Guide / Operation Manual. Page 27

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Cause The display timed out, turning off

the display.

Solution Adjust the display setting to

your preference. See “Adjusting the
Display Time-Out,” page 13.

Cause Dead batteries.

Solution Replace the batteries. See

“Replacing the Batteries,” page 28.

Cause The contrast is set too low.

Solution Adjust the contrast setting. See

“Adjusting the Touchscreen Contrast,”
page 11.

• The batteries are low or dead.

• The batteries were installed 

incorrectly.

• The batteries are old.

Solution Replace all batteries. See

“Replacing the Batteries,” page 28.

Cause The display timed out.

Solution Increase the period 

assigned to the Display Time-out
feature. See “Adjusting the Display
Time-Out,” page 13.

Cause The contrast settings may be set

too low.

Solution Adjust the contrast setting to

your preference. See “Adjusting the
Touchscreen Contrast,” 
page 11.

Cause The batteries are low.

Solution Have fresh batteries ready to

replace all batteries when you 
receive the Low Batteries warning. See
“Replacing the Batteries,” page 28.

Cause The batteries are too low to

provide proper operation.

Solution Replace all batteries. See 

“Replacing the Batteries,” page 28.

Cause Using the Backlight button wears

down the batteries when used
extensively.

●

Use the Backlight button less.

–or–

Reduce the period assigned to the
Display Time-out feature. See
“Adjusting the Display Time-Out,” page
13.

Cause Each serial port already has a

device connected to it. 

Solution Disconnect a computer 

peripheral device from a serial port that
you don't use or need, and then re-
move it from the list of devices in the
Windows Device Manager. Note that
after removing a device from the Win-
dows Device Manager, you will need to
reinstall it, if you choose to again use it
on that serial port.