TA-AV571 - Sony Audio Service Manual (repair manual). Page 3

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[Fluorescent Indicator Tube, LED All Lit, and Key Check Mode]
1. When the plug is inserted into the outlet while pressing the

 3 CLASSIC  button, the fluorescent indicator tube and LED
will light up completely.

2. The mode changes as follows each time the  3 CLASSIS  button

and  DBFB ON/OFF  button are pressed together after 1.

Sequence of Service Modes

Fluorescent Indicator
Tube and LED Check Mode

*1

 AMP check mode

*2

 KEY check mode

*3

• Press the  3 CLASSIC  button and  DBFB ON/OFF

button at the same time.

• Press the  3 CLASSIC  button and  DBFB ON/OFF

button at the same time.

• Press the  3 CLASSIC  button and  DBFB ON/OFF

button at the same time.

*1 For checking if the fluorescent indicator tube and LED are lit

completely

*2 When the AMP check mode is set, “AMP” is displayed on the

fluorescent indicator tube. As this mode is not used for servic-
ing, perform step 2 to enter the KEY check mode.

*3 When the KEY check mode is set, “KEY 0” is displayed on the

fluorescent indicator tube. Each press of the button is counted.
(This excludes the  POWER  button)
When all buttons are pressed, the AMP check mode is set.
Buttons pressed once will not be counted when pressed again.

3. To exit the test mode, press the  POWER  button.