Sony RM-AX4000 Service Manual page 10

RM-AX4000
5. Backlight adjustment
It is set to LEVEL 5 by default.
CHANNEL+ button: Turns on the backlight at LEVEL 15.
CHANNEL– button: Turns on the backlight at LEVEL 1.
MUTING button: Turns off the backlight.
OK button: Proceeds to the key test.
6. Key test
The display for the key test is as follows.
28 arrows
(1) Pressing a hard key, and " " at the corresponding position
disappears.
* The operation is invalid when more than one button is
pressed at the same time.
(2) After all the buttons are checked, "OK" appears at the title.
(3) Press the OK button to proceed to the LEARN signal reception
circuit check.
7. LEARN signal reception circuit check
(1) Press the CHANNEL+ button to activate the learning circuit
for 10 seconds, and learning start.
When learning is complete, "OK" appears at the title.
Press the CHANNEL+ button again to send the learned data.
(The data is stored in the RAM and is not written in a flash
memory.)
(2) Press the OK button to close the test mode.
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